process for manufacturing an ophthalmic device, silicone hydrogel contact lens body and mold member

专利摘要:
OPHTHALMIC DEVICE MOLDS FORMED OF HIGHLY AMORPHIC VINYL ALCOHOL POLYMER, ALI MOLDED OPHTHALMIC DEVICE, AND RELATED PROCESSES. Ophthalmic device molds made from at least one highly amorphous vinyl alcohol polymer, ophthalmic devices such as eye inserts and contact lenses and including silicone hydrogel devices formed using these molds, and related processes are described. Ophthalmic device manufacturing processes can use dry or wet release molds, or dry or wet lens removal processes.
公开号:BR112013002366B1
申请号:R112013002366-0
申请日:2011-06-13
公开日:2021-01-05
发明作者:Neil Goodenough；David Robert Morsley；Ian Bruce；Edyta S Bialek；Lee Darren Norris
申请人:Coopervision International Holding Company, Lp；
IPC主号:

专利说明:

Field
[001] The present exhibition refers to ophthalmic device molds comprising a highly amorphous vinyl alcohol polymer, ophthalmic devices including eye inserts and melt-molded contact lenses using a mold formed of a highly amorphous vinyl alcohol polymer, and related processes. Background
[002] In fusion molding processes for producing ophthalmic devices, such as eye inserts and contact lenses, a reaction mixture or polymerizable composition is commonly cured in a cavity shaped device defined by a first member mold with a device forming mold surface and a second mold member with a device forming mold surface, or a female and male mold member, respectively. Mold members are typically produced by injection molding a thermoplastic polymer into mold-shaped cavities. Examples of thermoplastic polymers that can be used to make molds of ophthalmic devices include non-polar thermoplastic polymers, such as polypropylene, polystyrene, and polyethylene; and polar thermoplastic polymers, such as ethylene - vinyl alcohol copolymers and polyvinyl alcohol homopolymers. When casting ophthalmic devices, after placing a polymerizable composition in the first mold member, the first and second mold members are placed together or coupled to form a mold assembly with an ophthalmic device shaped cavity between them. The mold assembly is then cured to polymerize the polymerizable composition, forming the polymeric ophthalmic device in the mold-shaped cavity of the mold assembly.
[003] Contact lenses, including silicone hydrogel contact lenses, have been molded by melting into molds made of ethylene-vinyl alcohol (EVOH) copolymers, eg SO ARLITE S available from Nippon Gohsei, Ltd., Osaka , Japan. Molding of silicone hydrogel lenses in EVOH molds has been shown to result in lenses having ophthalmically acceptably moisturized surfaces. Previously, it was necessary to apply a surface treatment such as, for example, a plasma treatment, or to include an inter-penetrating network of a polymeric wetting agent in silicone hydrogel ophthalmic devices so that the device surfaces ophthalmically acceptable moisturizers when hydrated. However, EVOH is an expensive material that is essentially insoluble in water. The high cost of EVOH molds can negatively impact production costs. In addition, EVOH copolymers typically have high levels of crystallinity of about 40% or greater (ie, the EVOH copolymer is typically composed of 60% or less of amorphous material). The high level of crystalline content in these materials results in the materials being opaque, which can be problematic in a molding material. Also, it may be difficult to release the polymeric ophthalmic device body from the EVOH mold members following curing, which can negatively impact device yields and production costs.
[004] It has also been proposed to use polyvinyl alcohol (PVOH) homopolymers, including modified forms of PVOH, for forming ophthalmic device molds, including contact lens molds. In some cases, the crystallinity level of some forms of PVOH may be high (and consequently the level of amorphous content low), such as, for example, about 48% or more. However, the use of many forms of PVOH has been found not to be ideal for use as ophthalmic device lens molds. For example, as the traditional melt processing temperature and thermal degradation temperature of unmodified PVOH are almost identical, it is very difficult to use these materials for injection molding of ophthalmic device molds.
[005] Although some modified forms of PVOH have been proposed for use as molds of ophthalmic devices, these modified forms of PVOH still retain some of the undesirable properties of unmodified PVOH, such as, for example, high crystalline content that can reduce transmission of light through material. While the prospect of using forms of PVOH for molding software devices can be attractive, these undesirable properties make it difficult to use modified or unmodified forms of PVOH in commercial production of ophthalmic devices, including eye inserts and contact lenses.
[006] EP 2 181 836 relates to molds for the manufacture of ophthalmic lenses, including plastic injection molded ophthalmic lens molds that are manufactured to have customized optical quality lens defining surfaces to produce ophthalmic lenses personalized. US 2007/216045 relates to release agents used in the production of silicone hydrogel materials. US 6,867,245 refers to contact lenses having a surface contact angle of 10-50 ° by the method of captive bubble in water and 30-90 ° by the method of sessile air drop.
[007] In view of the above, it can be appreciated that there is a need for ophthalmic device molds comprising new types of fusion molding materials for ophthalmic devices including silicone hydrogel ophthalmic devices, for new injection molded ophthalmic devices using molds comprising these new types of materials, for packaged ophthalmic devices molded by fusion using molds comprising new types of materials, and for associated manufacturing processes that use these new types of materials which can be cheaper and more process friendly . There is a particular need for highly amorphous materials that can be used to form molds suitable for molding contact lenses.
[008] All publications, including patents, published patent applications, scientific or commercial publications and the like, cited in this specification are hereby incorporated in their entirety. Summary
[009] The present exhibition is directed to a process of manufacturing an ophthalmic device. The process may comprise the steps of providing at least one highly amorphous vinyl alcohol polymer having an average level of crystallinity of less than 35%; and using at least one vinyl alcohol polymer to form at least one of a first mold member and a second mold member, the first mold member comprising a molding surface configured to mold a front surface of an ophthalmic device and the second mold member mold comprising a molding surface configured to mold a back surface of an ophthalmic device, the first mold member and the second mold member configured to form an ophthalmic device-shaped cavity between them when combined as a mold assembly .
[0010] A process of the present exhibition may further comprise the steps of placing a polymerizable composition comprising at least one hydrophilic monomer in the first mold member or the second mold member; and mold assembly assembly by contacting the first mold member and second mold member so as to form between them the cavity in the form of an ophthalmic device with the polymerizable composition contained in the cavity in the form of an ophthalmic device of the mold assembly.
[0011] The process of the present exhibition may further comprise the curing step of a polymerizable composition in the mold assembly to form a polymerized reaction product melt-molded in the mold-shaped ophthalmic device cavity, the polymerized reaction product comprising a polymeric ophthalmic device body.
[0012] In an example of a process of the present exhibition, the ophthalmic device may comprise an ocular insert configured to contact an anterior ocular surface, the first mold member may comprise a molding surface configured to mold an anterior surface. of an ocular insertion, the second mold member can comprise a molding surface configured to mold a posterior surface of an ocular insert, the first mold member and the second mold member can be configured for forming between them of an ocular insertion-shaped cavity when combined as a mold assembly, and the polymerized reaction product may comprise a polymeric ocular insertion body.
[0013] In another example of a process of the present exhibition, the ophthalmic device may comprise a contact lens, the first mold member may comprise a concave molding surface configured to mold an anterior surface of a contact lens, the second mold member can comprise a convex molding surface configured to mold a posterior surface of a contact lens, the first mold member and the second mold member can be configured to form a shaped cavity between them contact lens when combined as a mold assembly, and the polymerized reaction product may comprise a polymeric contact lens body.
[0014] In one example, the at least one highly amorphous vinyl alcohol polymer may comprise or consist of a vinyl alcohol homopolymer. In another example, the at least one highly amorphous vinyl alcohol polymer may comprise or consist of a vinyl alcohol copolymer.
[0015] The at least one vinyl alcohol copolymer may comprise or consist of a vinyl alcohol copolymer containing acetic ester group. In one example, the vinyl alcohol copolymer containing acetic ester group can comprise vinyl alcohol units, and units of an acetic ester group having a structure represented by the formula (1:
where each of R1 and R2 of structure (1) is independently a hydrogen atom or an acetyl acetyl group and at least one of R1 and R2is an acetyl acetyl group, and each of R3, R4, R5, R6, R7, and R8 of structure (1) independently is a hydrogen atom or an organic group, and X is a single bond or a bond chain. In another example, the vinyl alcohol copolymer containing acetic ester group can comprise vinyl alcohol units having a 1,2-diol structure represented by structure (2):
where each of R3R4, R5, R6, R7, and R8 of structure (2) is independently a hydrogen atom or an organic group, and X of structure (2) is a single bond or a bonding chain. In yet another example, the vinyl alcohol copolymer containing acetic ester group may comprise units having the

[0016] The at least one vinyl alcohol copolymer may comprise or consist of a vinyl alcohol copolymer that has been partially acetalized. In one example, a vinyl alcohol copolymer that has been partially acetalized may comprise vinyl alcohol units having a 1,2-diol structure represented by the structure (2):
where each of R3R4, R5, R6, R7, and R8 of structure (2) is independently a hydrogen atom or an organic group, and X of structure (2) is a single bond or a bonding chain.
[0017] The at least one vinyl alcohol copolymer can comprise or consist of vinyl alcohol units having a 1,2-diol structure represented by structure (2):
where each of R3R4, R5, R6, R7, and R8 of structure (2) is independently a hydrogen atom or an organic group, and X of structure (2) is a single bond or a bonding chain. In another example, the at least one vinyl alcohol copolymer can comprise or consist of vinyl alcohol units having a 1,2-diol structure represented by structure (4):

[0018] In another example, the at least one vinyl alcohol polymer can have a melting point of about 140oC to about 190oC.
[0019] In another example, the at least one vinyl alcohol polymer can have a glass transition temperature of about 60oC to about 85oC.
[0020] In another example, the at least one highly amorphous vinyl alcohol polymer may be soluble in water.
[0021] In a process of the present exhibition, the step of placing a polymerizable composition in one of the first mold member or the second mold member can comprise placing a polymerizable composition comprising at least one silicone monomer, macromer of silicone, silicone prepolymer, or combination thereof, and at least one hydrophilic monomer in the first mold member, and where the ophthalmic lens body comprises a silicone hydrogel contact lens body.
[0022] In a process of the present exhibition, the step of using at least one vinyl alcohol polymer to form at least one of the first mold member and the second mold member can comprise injection molding of at least one of the first mold member and second mold member. The vinyl alcohol polymer injection molding process may comprise forming at least one of the first mold member and the second mold member using a process setting selected from the group consisting of: melting temperature of about 180 ° C at about 250oC, cylinder temperature from about 180oC to about 250oC, throat temperature from about 30oC to about 70oC, mold tool temperature from about 30oC to about 95oC, holding time of about 1 second at about 5 seconds, injection speed of about 50 mm / second to about 250 mm / second, plasticizer speed of about 100 mm / second to about 300 mm / second, injection pressure of about 5 x 106Pa ( 50 bar) at about 1.8 x 107Pa (180 bar), holding pressure of about 1 x 106Pa (10 bar) at about 2 x 107Pa (200 bar), against pressure of about 5 x 105Pa (5 bar) at about 2.5 x 106Pa (25 bar), and any combinations thereof.
[0023] The process may further comprise the step of releasing a polymeric ophthalmic device body from at least one mold member of the ophthalmic device mold assembly comprising at least one highly amorphous alcohol-polymer polymer. The device body release step of at least one mold member may comprise a wet release step, a wet lens release step, or a lens release and wet release step. In one example, the wet release step, wet lens release step or wet lens release and release step can result in the mold member comprising at least one highly amorphous vinyl alcohol polymer being at least partially dissolved.
[0024] The present exhibition is also directed to a silicone hydrogel contact lens body, comprising a melt molded silicone hydrogel lens body comprising the reaction product of a polymerizable composition, the polymerizable composition comprising at least a silicone monomer and at least one hydrophilic monomer, where the lens body is melt-molded into a mold assembly comprising a first mold member and a second mold member, at least one of the first mold member and the second mold member comprising or consisting of at least
[0025] A highly amorphous vinyl alcohol polymer having an average level of crystallinity of less than 35%. In one example, the at least one highly amorphous vinyl alcohol polymer may comprise or consist of a vinyl alcohol homopolymer. In another example, the at least one highly amorphous vinyl alcohol polymer may comprise or consist of a vinyl alcohol copolymer. In yet another example, the at least one vinyl alcohol polymer may comprise or consist of a vinyl alcohol copolymer containing acetic ester group, or a vinyl alcohol copolymer that has been partially acetalized, or a vinyl alcohol copolymer which comprises vinyl alcohol units having a 1,2-diol structure, or any combination thereof.
[0026] The present exhibition is also directed to a mold member for the melting molding of an ophthalmic device body, comprising a mold member comprising a molding surface and a non-molding region, where at least the molding surface the mold member comprises or consists of at least one highly amorphous vinyl alcohol polymer having an average crystallinity level of less than 35%. In one example, the at least one highly amorphous vinyl alcohol polymer may comprise or consist of a vinyl alcohol homopolymer. In another example, the at least one highly amorphous vinyl alcohol polymer can comprise or consist of a vinyl alcohol copolymer. In yet another example, the at least one vinyl alcohol polymer can comprise or consist of a vinyl alcohol copolymer containing acetic ester group, or a vinyl alcohol copolymer that has been partially acetalized, or a vinyl alcohol copolymer that comprises vinyl alcohol units having a 1,2-diol structure, or any combination thereof.
[0027] Any and all features described herein and any combination of such features are included in the scope of this patent application as long as the features of any combination are not mutually inconsistent. In addition, any feature or combination of features can be specifically excluded from any example in the present exhibition. Brief Description of Drawings
[0028] Fig. 1 is a flow chart illustrating steps in a process for producing an ophthalmic device.
[0029] Fig. 2 is a flow chart illustrating certain inputs and outputs of the process in Fig. 1.
[0030] Detailed Description
[0031] It has been found that molds of ophthalmic devices, including ocular insertion molds and contact lens molds, manufactured from at least one highly amorphous vinyl alcohol polymer can be used for melting molding of bodies of polymeric ophthalmic devices, for example, polymeric eye inserter bodies and polymeric contact lens bodies.
[0032] As used herein, a vinyl alcohol polymer is a polymer comprising at least one unit of a vinyl alcohol functional group. The vinyl alcohol polymer can be a vinyl alcohol homopolymer or a vinyl alcohol copolymer. A vinyl alcohol homopolymer is a polymer comprising only the repeating unit of a vinyl alcohol functional group, that is, polyvinyl alcohol (PVOH), or a modified form of PVOH such as a form of PVOH that has been physically combined (i.e. , unreacted or copolymerized) with ingredients such as plasticizers that modify the properties of PVOH, such as, for example, the melting temperature to allow PVOH to be injection molded. A vinyl alcohol copolymer is a polymer comprising at least one unit of a vinyl alcohol functional group and units of a functional group that is not a vinyl alcohol, and is thus distinct from a vinyl alcohol homopolymer.
[0033] The term "highly amorphous vinyl alcohol polymer" refers to a vinyl alcohol polymer containing a large number of amorphous regions and thus few crystalline regions, that is, few regions of three-dimensional ordering over atomic length scales . The highly amorphous vinyl alcohol polymer can be a highly amorphous vinyl alcohol homopolymer, or a highly amorphous vinyl alcohol copolymer. In polymers, crystalline regions can arise from intramolecular folding of the polymer, from stacking adjacent polymer chains, or both. Polymers can contain both crystalline and amorphous regions. The degree of crystallinity is commonly used to describe the crystalline content of a given polymer, with a degree of crystallinity of 0 indicating a completely non-crystalline (amorphous) polymer and a degree of crystallinity of 1 indicating a completely crystalline polymer. The crystalline content can also be expressed as a percentage, with an average crystallinity level of 0% indicating a completely non-crystalline (amorphous) polymer and an average crystallinity level of 100% indicating a completely crystalline polymer. The degree or level of crystallinity can be determined using differential scanning calorimetry (DSC). For example, the degree or level of crystallinity can be determined using DSC by heating a sample of the polymer at a heating rate of 10oC / minute from 0oC to 250oC, and determining the degree or level of crystallinity based on the first first cooling and heating cycle conducted over it. As used herein, the highly amorphous vinyl alcohol polymer is understood to be a vinyl alcohol polymer with an average level of crystallinity of about 0% to about 35%, including, for example, a vinyl alcohol polymer with a medium level crystallinity of less than or equal to 35%, or less than or equal to 30%, or less than or equal to 25%, or less than or equal to 20%, or less than or equal to 15%, or less than or equal to 10%, or about 5% to about 35%, or about 10% to about 35%, or about 15% to about 30%, or about 17% about 25%.
[0034] The highly amorphous vinyl alcohol polymer may comprise vinyl alcohol units having a 1,2-diol structure.
[0035] Vinyl alcohol units having a 1,2-diol structure of the highly amorphous vinyl alcohol polymer may comprise or consist of vinyl alcohol units having a 1,2-diol structure represented by the structure (2)
where each of R3, R4, R5, R6, R7, R8 of structure (2) independently is a hydrogen atom or an organic group, and X of structure (2) is a single bond or a linker chain.
[0036] On a molecular structure basis, a total content of units of vinyl alcohol of structure (2) present in a molecule of the highly amorphous vinyl alcohol polymer can be from about 0.1% to about 30%. In another example, from about 0.3% to about 20%, or from about 0.5% to 25%, or from about 3% to about 16%, or about 0.5% about 15%, or from about 0.1% to about 10%, or from 0.1% to about 1.5%, or from about 0.4% to about 1.2% of the total number of units present in a polymer molecule can comprise units of vinyl alcohol of structure (2).
[0037] Vinyl alcohol units having a 1,2-diol structure of the highly amorphous vinyl alcohol polymer may comprise or consist of vinyl alcohol units having a 1,2-diol structure represented by the structure (4) : HH

[0038] On a molecular basis, a total content of units of vinyl alcohol of structure (4) present in a molecule of the highly amorphous vinyl alcohol polymer can be from about 0.1% to about 30%. In another example, from about 0.3% to about 20%, or from about 0.5% to 25%, or from about 3% to about 16%, or about 0.5% about 15%, or from about 0.1% to about 10%, or from 0.1% to about 1.5%, or from about 0.4% to about 1.2% of the total number of units present in a polymer molecule can comprise units of vinyl alcohol of structure (4).
[0039] The highly amorphous vinyl alcohol polymer may comprise units of a diacetyloxy group. For example, the highly amorphous vinyl alcohol copolymer can comprise 3,4-diacetyloxy-1-butene units.
The highly amorphous vinyl alcohol copolymer can be entirely or partially saponified (i.e., all or at least one ester group present in the polymer has been reacted, for example, heated with an alkali, to produce a free alcohol group). In other words, all ester groups present in the vinyl alcohol copolymer, for example, acetic ester groups, may have been replaced with hydroxyl groups through saponification, or only a portion of the ester groups may have been replaced with hydroxyl groups through saponification. The highly amorphous vinyl alcohol copolymer can be saponified to a degree of at least 50 moles%, or at least 60 moles%, or at least 70 moles%, or at least 80 moles%, or at least 90 moles%.
[0041] In one example, the highly amorphous vinyl alcohol copolymer may comprise or consist of a vinyl alcohol copolymer containing acetic aceto ester group. The vinyl alcohol copolymer containing acetic ester group may comprise vinyl alcohol units, and units of an acetic ester group having a structure represented by structure (1):
where each of R1e R2 of structure (1) is independently a hydrogen atom or an acetyl acetyl group and at least one of R1e R2is an acetyl acetyl group, and each of R3, R4, R5, R6, R7, and R8 of structure (1) is independently a hydrogen atom or an organic group, and X of structure (1) is a single bond or a linker chain. The organic group of structure (1) can be an alkyl group.
[0042] On a molecular basis, a total content of acetic ester group units of structure (1) present in the vinyl alcohol copolymer containing acetic ester group can be from about 0.1% to about 30%. In other words, in every copolymer molecule, when the total number of units of different types of groups present in the molecule is 100%, from about 0.1% to about 30% of the total number of units present in the molecule can comprise structural units (1). For example, if the copolymer molecule is made up of a total of 200 units of various types, about 0.2 to about 60 of those units may comprise structure units (1). In another example, from about 0.3% to about 20%, or from about 0.5% to 25%, or from about 3% to about 16%, or about 0.5% about 15%, or from about 0.1% to about 10%, or from 0.1% to about 1.5%, or from about 0.4% to about 1.2% of the Total number of units present in a copolymer molecule can comprise units of structure (1).
[0043] The vinyl alcohol units of the vinyl alcohol copolymer containing acetic ester group may comprise or consist of vinyl alcohol units having a 1,2-diol structure. Vinyl alcohol units having a 1,2-diol structure may comprise or consist of vinyl alcohol units having a 1,2-diol structure represented by the structure (2:
where each of R3, R4, R5, R6, R7, and R8 of structure (2) is independently a hydrogen atom or an organic group, and X of structure (2) is a single bond or a bonding chain.
[0044] On a molecular structure basis, a total content of units of vinyl alcohol of structure (2) present in a molecule of the vinyl alcohol copolymer containing acetic ester group can be from about 0.1% to about 30 %. In another example, from about 0.3% to about 20%, or from about 0.5% to 25%, or from about 3% to about 16%, or about 0.5% about 15%, or from about 0.1% to about 10%, or from 0.1% to about 1.5%, or from about 0.4% to about 1.2% of the total number of units present in a copolymer molecule may comprise units of vinyl alcohol of structure (2).
[0045] The vinyl alcohol copolymer containing acetic ester group may comprise units having a structure represented by structure (3):

[0046] On a molecular structure basis, a total content of structure units (3) present in a vinyl alcohol copolymer molecule containing acetic ester group can be from about 0.1% to about 30% . In another example, from about 0.3% to about 20%, or from about 0.5% to 25%, or from about 3% to about 16%, or about 0.5% about 15%, or from about 0.1% to about 10%, or from 0.1% to about 1.5%, or from about 0.4% to about 1.2% of the total number of units present in a copolymer molecule can comprise units of structure (3).
[0047] In another example, the highly amorphous vinyl alcohol copolymer may comprise or consist of a vinyl alcohol copolymer that has been partially acetalized (that is, at least one oxygen atom with double bond to a carbon atom present in the copolymer it was reacted, for example, through an acid catalyzed reaction, to form an acetal or ketal group). The vinyl alcohol copolymer that has been partially acetalized may comprise vinyl alcohol units having a 1,2-diol structure. The vinyl alcohol units having the 1,2-diol structure can have a 1,2-diol structure represented by the structure (2):
where each of R3, R4, R5, R6, R7, and R8 of structure (2) independently represents a hydrogen atom or an organic group, and X of structure (2) is a single bond or a linker chain.
[0048] On a molecular structure basis, a total content of units of vinyl alcohol of structure (2) present in a molecule of the vinyl alcohol copolymer that has been partially acetalized may be about 0.1% about 30%. In another example, from about 0.3% to about 20%, or from about 0.5% to 25%, or from about 3% to about 16%, or about 0.5% about 15%, or from about 0.1% to about 10%, or from 0.1% to about 1.5%, or from about 0.4% to about 1.2% of the total number of units present in a copolymer molecule may comprise units of vinyl alcohol of structure (2).
[0049] The vinyl alcohol copolymer that has been partially acetalized can be entirely or partially saponified. The vinyl alcohol copolymer that has been partially acetalized can be saponified to a degree of at least 50 moles%, or at least 60 moles%, or at least 70 moles%, or at least 80 moles%, or at least 90 moles%.
[0050] In one example, the highly amorphous vinyl alcohol polymer may be a vinyl alcohol polymer that is visibly soluble in water or in an aqueous solution at room temperature (for example, about 20-25 degrees C). For example, the highly amorphous vinyl alcohol polymer may be a polymer for which 50 grams or more of the polymer is visibly entirely soluble in 1 liter of deionized water at 20 degrees C (ie, the polymer is soluble at a hair level minus 5% weight / weight in water) as determined using a standard shake bottle process as known to those skilled in the art. In another example, the highly amorphous vinyl alcohol polymer may be a polymer for which 100 grams or more of the polymer is visibly soluble in 1 liter of deionized water at 20 degrees C. In another example, the highly alcoholic vinyl polymer amorphous can be a polymer for which 150 grams or more of the polymer is visibly soluble in 1 liter of deionized water at 20 degrees C. In yet another example, the highly amorphous vinyl alcohol polymer can be a polymer for which 200 grams or more of the polymer are visibly soluble in 1 liter of deionized water at 20 degrees C.
[0051] When formed on a dry film, the highly amorphous vinyl alcohol polymer may have a low oxygen transmittance rate. For example, the oxygen transmittance rate through a film formed from the polymer can be less than 2.0 cm320μ / m2dia atm, or less than 1.5 cm320 μ / m2dia atm, or less than 1.0 cm320μ / m2dia atm , or less than 0.5 cm320μ / m2dia atm, or less than 0.2 cm320μ / m2dia atm as determined for a dry sample at 20 degrees C. In another example, the oxygen transmittance rate may be less than 0.005 cm320μ / m2dia, or less than 0.004 cm320μ / m2dia, or less than 0.003 cm320μ / m2 day. When a highly amorphous vinyl alcohol polymer with a low rate of oxygen transmittance is used to form a mold member used for fusion molding of an ophthalmic device, due to the low level of oxygen transmittance of the mold member, it may be possible cure the ophthalmic device in an oxygen-containing atmosphere without the presence of oxygen in the atmosphere interrupting the healing process. Thus, in one example, the manufacturing processes of the present exhibition can be processes using mold members formed from highly amorphous vinyl alcohol polymer having low oxygen transmission rates and may involve curing of a polymerizable composition in the presence of a con- having oxygen or rich in oxygen to form the polymeric ophthalmic device, although it is also possible to cure the polymerizable composition in the presence of a low oxygen or essentially oxygen free atmosphere, such as, for example, a gas rich atmosphere nitrogen or an inert gas.
[0052] The highly amorphous vinyl alcohol polymer can be biodegradable. For example, the highly amorphous vinyl alcohol polymer may have a level of biodegradability of at least 40%, or at least 50%, or at least 60%, after a rest time of about 30 days as determined using the ISO 14851 test procedure with a sample of about 600 mL, about 300 mL of standard test solution, and a temperature of around 25oC.
[0053] The highly amorphous vinyl alcohol polymer of the present exhibition can be relatively transparent to visible light. When the transparency of the dry, solid polymer is measured as a percentage of turbidity, the percentage of turbidity in the polymer can be less than 30%, or less than 27%, or less than 24% or less than 22%, or less than 20%, or less than 18%. The highly amorphous vinyl alcohol polymer of the present exhibit may have a relatively low level of UV light transmittance. The transmittance of UV light through a mold member formed from the polymer can be less than 15% (i.e., more than 85% of UV light is not transmitted). The transmittance of UV light through the mold member can be less than 10%, or less than 5%, or less than 3%. When mold members formed from the polymer having low UV light transmittance are used in a curing process involving the use of UV light, the level of UV light transmitted in the device forming cavity may need to be high, and thus a high incident UV light level may need to be applied to the outside of the mold member. For example, more than 500 μW, or more than 750 μW, or more than 1000 μW, or more than 1200 μW, or more than 1500 μW of UV light can be applied to the outside of the mold member during the curing process. As many UV light bulbs are known to work best when operating at higher levels, providing such levels of incident light can allow UV bulbs to operate more efficiently, increasing bulb life.
[0054] The highly amorphous vinyl alcohol polymer can be a thermoplastic vinyl alcohol polymer, that is, a vinyl alcohol polymer that becomes liquid or malleable when heated and freezes to a glassy state when sufficiently cooled, and that can be repeatedly melted and molded again.
[0055] The highly amorphous vinyl alcohol polymer can be an extrudable vinyl alcohol polymer, that is, a vinyl alcohol polymer that can be processed by pushing or stretching the polymer through a die to form an object in a desired.
[0056] The highly amorphous vinyl alcohol polymer can be a vinyl alcohol polymer suitable for injection molding, that is, a vinyl alcohol polymer that can be processed by heating the polymer to a fluid state and injecting it into a mold to form an object in a desired way. The vinyl alcohol polymer suitable for injection molding may have a melting point below its decomposition temperature. For example, the melting point can be more than about 20oC, more than about 40oC, more than about 60oC, more than about 80oC, or more than about 100oC below the polymer decomposition temperature. In one example, the decomposition temperature of the vinyl alcohol polymer can be around 300oC.
[0057] In one example, the melting point of the vinyl alcohol polymer can be about 140oC to about 190oC, about 155oC to about 180oC, about 160oC to about 172oC, or about 150oC at about 230oC. In another example, the glass transition temperature of the vinyl alcohol polymer can be from about 60oC to about 85oC, from about 65oC to about 80oC, or from about 70oC to about 76oC.
[0058] The highly amorphous vinyl alcohol copolymer can comprise a vinyl alcohol copolymer with a high content of vinyl alcohol, or with a low content of vinyl alcohol, that is, most of the units present in the vinyl alcohol copolymer can be units of a type of vinyl alcohol, or a minority of the units present in the vinyl alcohol copolymer can be units of a type of vinyl alcohol, respectively. The highly amorphous vinyl alcohol copolymer can be a vinyl alcohol copolymer having a vinyl alcohol unit content greater than or equal to about 95%, greater than or equal to about 90%, greater than or equal to about 85 %, greater than or equal to about 80%, greater than or equal to about 75%, greater than or equal to about 70%, greater than or equal to about 65%, greater than or equal to about 60 %, greater than or equal to about 55%, greater than or equal to about 50%, greater than or equal to about 45%, greater than or equal to about 40%, greater than or equal to about 35 %, greater than or equal to about 30%, greater than or equal to about 25%, greater than or equal to about 20%, greater than or equal to about 15%, greater than or equal to about 10 %, greater than or equal to about 5%, or less than or equal to about 5%. The percentage of vinyl alcohol units in the polymer chain can be expressed as a weight percentage basis, or a molar percentage basis.
The highly amorphous vinyl alcohol copolymer may be another vinyl alcohol copolymer other than an ethylene-vinyl alcohol copolymer (ie, the highly amorphous vinyl alcohol copolymer is not comprised of ethylene units). The highly amorphous vinyl alcohol copolymer can be a vinyl alcohol copolymer essentially free of ethylene moiety. The vinyl alcohol copolymer can be a vinyl alcohol copolymer that does not comprise ethylene - vinyl alcohol units having a structure represented by structure (5):
where structure men (5) are independently integers of 1 or greater.
[0060] It has been found that molds of ophthalmic devices manufactured from the highly amorphous vinyl alcohol polymers described herein can be used for fusion molding of ophthalmic lens bodies. Ophthalmic devices can be demoulded, lenses removed or both demoulded or lenses removed and molds made partially or entirely from one or more highly amorphous vinyl alcohol polymers using demolding processes, or lens removal or both demolding and “wet” lens removal ”, That is, processes involving the application of a liquid to the device body and the assembly of mold or mold member or molding surface. Ophthalmic devices can also be demoulded, lenses removed or both demoulded and lenses removed using demolding, lens removal processes, or both, demolding and lens removal “dry”, that is, processes that do not involve applying a liquid to the device body and the mold cavity or mold member or molding surface. Unlike molds made of PVOH having a low amorphous content, molds made of highly amorphous vinyl alcohol polymers can be formed by injection molding, or they can be formed by compression molding, continuous compression molding, thermoforming, etc. Also, use of these molds made of at least one highly amorphous vinyl alcohol polymer to mold silicone hydrogel ophthalmic devices can result in device bodies having surfaces that are acceptably ophthalmically moisturable without applying a surface treatment to the device surfaces and without the presence of components in the polymerizable composition that form an inter-penetrating network (IPN) of a polymeric wetting agent in the device body.
[0061] One or more of the highly amorphous vinyl alcohol polymers shown here can be used to form at least one molding surface, or mold member, or mold assembly used for melting molding of an ophthalmic device. For example, a molding surface of a mold member can be formed through injection molding of highly amorphous vinyl alcohol polymer, through machining of highly amorphous vinyl alcohol polymer, or through both, injection molding and machining of vinyl alcohol polymer. Machining can comprise etching, or ablation, or both, etching and ablation of highly amorphous vinyl alcohol polymer to form all or a portion of a molding surface.
[0062] The at least one mold surface, or mold member, or mold assembly formed from the highly amorphous vinyl alcohol polymer shown here may be a first mold member comprising a mold surface configured to mold an anterior surface of a ophthalmic device. The at least one mold member formed of the highly amorphous vinyl alcohol polymer can be a second mold member comprising a molding surface configured to mold a back surface of an ophthalmic device. The at least one mold member formed of the highly amorphous vinyl alcohol polymer can be both, a first mold member comprising a molding surface configured to mold a front surface of an ophthalmic device, and a second mold member comprising a molding surface. molding configured to mold a posterior surface of an ophthalmic device. The first mold member and the second mold member can be configured to form an ophthalmic device-shaped cavity between them when the first mold member and the second mold member are combined as a mold assembly.
[0063] As used herein, an ophthalmic device may comprise an ocular insertion. An ocular insertion is a device that, during use, is placed in contact with the conjunctiva or with an anterior ocular surface, or the punctum, or any combination thereof. The anterior ocular surface contacted by ocular insertion during use may comprise the cornea, or the sclera, or both. In one example, the ocular insertion may comprise a point plug. An ocular insertion may or may not be a transparent device, and may or may not include an optical zone providing vision correction. Optionally, the ocular insertion may comprise a drug delivery device, a diagnostic device, or both. When the ocular insertion comprises a drug delivery device, the drug delivery device can be configured to provide controlled release of a drug over a predetermined period of time such as, for example, 2 hours, or 12 hours, or 24 hours , or a week, or a month, or more than a month.
[0064] The at least one molding surface, or mold member, or mold assembly formed of the highly amorphous vinyl alcohol polymer shown here can be a first mold member comprising a molding surface configured to mold an anterior surface. of an ocular insertion. The at least one mold member formed of the highly amorphous vinyl alcohol polymer can be a second mold member comprising a molding surface configured to mold a posterior surface of an ocular insert. The at least one mold member formed of the highly amorphous vinyl alcohol polymer can be both, a first mold member comprising a molding surface configured to mold an anterior surface of an eye insertion, and a second mold member comprising a impression surface configured to shape the back surface of an ocular insert. The first mold member and the second mold member can be configured to form an ocular insertion-shaped cavity between them when the first mold member and the second mold member are combined as a mold assembly.
[0065] As used here, contact lenses are understood to be polymers devices configured to be placed or arranged on a cornea of an animal or human eye. Generally, contact lenses comprise a convex anterior surface, and a concave posterior surface that can contact the cornea during use. Contact lenses can be cosmetic lenses or vision correction lenses or both, cosmetic and vision correction lenses. Vision correction lenses include a transparent optical vision correction zone. The optical vision correction zone may be surrounded by a non-vision correction peripheral zone which may also be transparent or may include a region intended to mask, enhance or change the eye's color or appearance. Cosmetic lenses are lenses intended to mask, enhance or change eye color or appearance, and may or may not be transparent and may or may not include an optical vision correction zone.
[0066] The at least one molding surface, or mold member, or mold assembly formed of the highly amorphous vinyl alcohol polymer shown here may be a first mold member comprising a concave molding surface configured to mold an anterior surface of a contact lens. The at least one mold member formed of the highly amorphous vinyl alcohol polymer can be a second mold member comprising a convex molding surface configured to mold a back surface of a contact lens. The at least one member formed of the highly amorphous vinyl alcohol polymer can be both, the first mold member comprising a concave molding surface configured to mold a front surface of a contact lens, and a second mold member comprising a convex molding surface configured to mold a back surface of a contact lens. The first mold member and the second mold member can be configured to form a contact lens-shaped cavity between them when the first mold member and the second mold member are combined as a mold assembly.
[0067] The injection molding process of contact lens bodies, including silicone hydrogel contact lens bodies, typically begins with the preparation of a pair of mold members (i.e., a first mold member and a second mold member). Mold members can be produced by injection molding a thermoplastic polymer mold material into mold-shaped cavities, by ripping polymer mold material to form the entire mold member, or through a combination of injection molding and ripping, for example, injection molding to form the basic shape of the mold member and then ripping all or part of the lens forming region of the mold member. For example, a first portion of the mold forming molding surface may comprise an injection molded lens forming molding surface, and a second portion of the device forming molding surface may comprise a device forming molding surface machined. In such an example, the first portion of the lens-forming molding surface may comprise a portion of the lens-forming molding surface by molding a peripheral zone and edge of a contact lens, and a second portion of the molding surface The lens-forming lens can comprise a portion of the lens-forming impression surface by molding an optical zone of a contact lens.
[0068] Typically, when melting ophthalmic devices having optical zones, two mold members are combined to form a mold assembly. The two mold members are cut and structured to be assembled together to define a device-shaped cavity between them. In one example, for molding a contact lens, each of the two mold members may comprise an optical quality concave lens forming molding surface used to mold a front surface of a lens, or a forming molding surface of convex optical quality lens used to shape a rear surface of a lens. For the purposes of this exhibition, the mold member with a concave molding surface is referred to as a first mold member or a female mold member, and the mold member with a convex molding surface is referred to as a second mold member or a male mold member. The first and second mold members can be structured to form a lens-shaped cavity between them when assembled with one another to form a mold assembly. Alternative mold member configurations, such as, for example, mold assemblies comprising more than two mold members or mold members that are shaped or structured differently than described above, can be used with highly amorphous vinyl alcohol polymers described herein. In addition, the mold members can be configured to comprise more than one lens forming region. For example, a single mold member can be configured to comprise a region configured to mold an anterior lens surface as well as a posterior lens surface, i.e., to act as a female or male mold member.
[0069] The highly amorphous vinyl alcohol polymer can be used to form at least one molding surface, or mold member or mold assembly (i.e., at least one mold) for molding polymeric ophthalmic device bodies. The at least one mold can be produced using conventional injection molding procedures known to those skilled in the art. For example, a quantity of the highly amorphous vinyl alcohol polymer can be heated to form a molten thermoplastic polymer. The molten thermoplastic polymer can be dispensed into a mold cavity in the form of an ophthalmic device mold. In one example, the mold cavity can include one or two optical quality contact lens forming molding surfaces. The impression surfaces used for forming optical quality lens forming impression surfaces may be provided as components of one or more removable inserts located in a plate or other housing, or may be machined as part of the impression cavity.
[0070] In one example, the process settings used for injection molding of highly amorphous vinyl alcohol polymer of the present exhibit may include: Melting temperature from about 160oC to about 250oC Cylinder temperature from about 160oC to about from 250oC Throat temperature from about 30oC to about 70oC Mold tool temperature from about 30oC to about 95oC Holding time from about 1 second to about 5 seconds Injection speed of about 50 mm / second to about 250 mm / second Plasticization speed from about 100 mm / second to about 300 mm / second Injection pressure from about 5 x 106Pa (50 bar) to about 1.8 x 107Pa (180 bar) Pressure retention rate of about 1 x 106Pa (10 bar) to about 2 x 107Pa (200 bar) Against pressure of about 5 x 105Pa (5 bar) to about 2.5 x 106Pa (25 bar).
[0071] For example, at least two of these process settings can be used for injection molding of highly amorphous vinyl alcohol polymer. In another example, three, four, five, six, seven, eight, nine, ten, or all of these process settings can be used for injection molding of vinyl alcohol polymer. In one example, the melting temperature can be from about 160oC to about 220oC, and the cylinder temperature from about 160oC to about 220oC. In another example, the melting temperature can be from about 180oC to about 250oC, and the cylinder temperature from about 180oC to about 250oC.
[0072] The at least one member can be produced through a combination of injection molding and machining, for example, ripping or ablation, where the basic shape of the mold is prepared through injection molding, and all or a portion of the device forming molding surface is prepared by removing a portion of the mold, for example, by machining a portion of the mold, such as, for example, all or a part of the mold region used to mold a zone optics of an ophthalmic device. In other words, according to the present exhibition, the molding surfaces forming the device of at least one mold member can be formed completely by injection molding one or more highly amorphous vinyl alcohol polymer, can be completely formed through machining of a portion of at least one highly amorphous vinyl alcohol polymer, or they can be formed through injection molding of at least one highly amorphous vinyl alcohol polymer to form a mold member, a region of the molding surface forming device from which it is subsequently machined to form the final forming device forming surface of the highly amorphous vinyl alcohol polymer mold member. Thus, in one example, injection molding of at least one of the first mold member and the second mold member can comprise forming a non-molding portion of at least one of the first mold member and the second mold member. mold through injection molding, and forming a device forming molding surface of at least one of the first mold member and the second mold member through machining or ripping or ablation or any combination thereof from the non-molding portion of the mold member.
[0073] The highly amorphous vinyl alcohol polymer can be used to form at least one device-forming molding surface of a mold member, where at least some of the mold member's non-molding regions (i.e., regions of the mold member) mold that are not used to form a surface of a device body) are formed of material other than the highly amorphous vinyl alcohol polymer. In one example, a non-molding portion of the mold member may be formed of a material that is essentially insoluble in water or aqueous solutions, such as, for example, a metal or polymeric material such as polypropylene. In one example, the non-molding portion may comprise a structure or support for a molding surface forming device comprising the highly amorphous vinyl alcohol polymer. The highly amorphous vinyl alcohol polymer can be used to form the entire device forming molding surface, or it can be used to form a portion of the device forming molding surface, such as a layer of a multilayer molding surface. device forming, where the highly amorphous vinyl alcohol polymer layer is the portion or layer of the device forming multi-layer surface that directly contacts the polymerizable composition during melt molding. The device forming molding portion or layer comprising the highly amorphous vinyl alcohol polymer can be formed using various processes, such as, for example, injection molding or film melting.
[0074] Regardless of the process used to form the mold member from highly amorphous vinyl alcohol polymer, the mold member can be used to mold cosmetic contact lenses having a design printed on one of its surfaces. These cosmetic contact lenses may or may not have a vision correction zone. Before placing a polymerizable composition in the mold member, a design of any kind can be placed on one or more of the lens forming surfaces of one or more of the mold members to be used to form the lens. The design printed on the mold member can be configured to mask the appearance of the eye, change the appearance of the eye, such as, for example, change the appearance of the eye color, to improve the appearance of the eye, as it is done, for example, by a limbal ring.
[0075] The design can be printed on any lens forming surface of the mold member, including a concave surface or a convex surface. The design can be printed on the surface forming the lens of the mold member using any printing process, such as, for example, using inkjet printing, using a cliché process, and the like.
[0076] The ink or pigment printed on the mold member can be a water based ink or pigment carrier, or it can be an organic solvent based or pigment carrier.
[0077] In one example, due to the use of the highly amorphous vinyl alcohol polymer to form the mold member on which the design is printed, a surface treatment such as, for example, a plasma treatment may not need to be applied to the molding surface so that the design is printed with good reproducibility on the molding surface, although optionally a surface treatment can also be applied. In one example, the paint or pigment carrier applied to the molding surface of the mold member does not form beads when applied to the molding surface. When the polymerizable composition is brought into contact with the printed impression surface and subsequently cured, demoulded and the lens removed, the impression becomes integrated into the polymeric lens body and remains with the lens body following the mold removal and lens removal.
[0078] When forming the molding surface or mold member through injection molding, the thermoplastic polymer melted in the mold cavity can then be cooled and separated from the molding surface and subsequently moved to a station to receive a volume of a polymerizable composition to be used to form a polymeric device body.
[0079] Following formation and cooling of the molding surface or mold member, a volume of polymerizable composition is placed in one of the mold members before mold members are combined to form the mold assembly. Typically this is accomplished by placing a predetermined amount of the polymerizable composition on one of the mold members, such as, for example, placing the polymerizable composition on a concave molding surface of a first mold member. The mold assembly is then assembled by placing another mold member in contact with the first mold member having the polymerizable composition, such as, for example, by placing a convex molding surface of a second member mold in contact with the first mold member so that a device shaped cavity is formed between the first and second mold members, the device shaped cavity containing the polymerizable composition. If used, a connection is then formed between the first and second mold members through any means being used in order to keep the mold members in correct alignment during the curing process.
[0080] When two or more mold members are combined as a mold assembly, the process of assembling mold members in a mold assembly can still comprise the step of forming a connection between the mold members or clamping of members molding each other. The mold members can be permanently attached to each other, or they can be temporarily attached to each other. The first mold member and the second mold member can be structured to be easily separated after being assembled together without causing substantial damage to the polymeric ophthalmic device body in the lens-shaped cavity.
[0081] In one example, the mold members can be configured to form a mechanical connection based on the shape of elements of the mold members. For example, mold members can be configured to form an interference fit when pressure is applied to one or both mold members. In another example, the mold members can both be threaded so as to form a connection by engaging interconnecting threads between the mold members. Other examples of mechanical connections may include perforations and protuberances between the mold members, or other closing structures.
[0082] In another example, the mold members can be affixed to each other using an adhesive substance placed between the mold members. The adhesive substance can comprise or consist of the same thermoplastic material used to form at least one of the mold members to be affixed to each other. For example, a non-molding portion of one or both of the thermoplastic mold members can be deformed or fused in order to affix the mold members to each other.
[0083] In one example, a non-molded portion of one or both mold members may be heated to melt the portion of one or both mold members to form a weld between the mold members in order to adhere the mold members to each other. The weld formed between the mold members may comprise a single weld located in a simple non-molding location between the mold members, for example, a single weld at a single point in a peripheral region surrounding the shaped cavity. - active. The weld formed between the mold members can comprise a plurality of welds, each located in a unique non-molding location between the mold member, for example, 2 or 3 or 4 or 5 or more individual welds each formed in one single point in a peripheral region, where the plurality of welds are positioned around the perimeter of the cavity in the form of a device. The plurality of welds can be equidistant from each other around the perimeter of the cavity in the form of a device, or they can be positioned in a non-symmetrical pattern. The weld formed between the mold members may comprise a single weld located around the entire perimeter of the lens-forming cavity. In such an example, although the thickness of the molten thermoplastic may vary across different portions of the weld, a single continuous weld is present between the mold members in an area that completely surrounds the perimeter of the cavity shaped device formed between the mold members.
[0084] In another example, a portion of a solvent capable of dissolving one or both mold members can be applied to one or both mold members in order to dissolve a non-molding portion of one or both mold members so fusing a surface of one mold member to a surface of the other mold member. When the dissolved mold material solidifies again, the molten material can act to affix the mold members together. When one or more of the mold members are formed of a water-soluble polymer, the solvent may comprise or consist of water or an aqueous solution. The amount of solvent applied can be a very small portion of the solvent such as, for example, a few microliters. The solvent can be dripped on a surface to be joined, it can be spread on a surface to be joined, it can be stamped on a surface to be joined, etc. For example, one or all of the mold members, before being placed together for mold assembly formation, can be contacted by a stamp moistened with the solvent. The cover can be shaped to adapt to the shape of the surface to be joined. For example, the pattern may be ring-shaped, so that when it contacts a non-molding region of one of the mold members surrounding the device-shaped region of the mold member, only the non-molding region of the member - mold brooch which is intended to be attached to the other mold member is moistened. While the solvent is still wet, the mold members can be brought into contact and fused together. Optionally, pressure can be applied to the mold assembly to assist in the process of fixing mold members to one another. The pressure can be applied for a period of time until the mold members have fully fused to each other. Optionally, heat or air can be applied to assist in melting mold members and solvent drying in order to reduce the amount of time for melting and the melt material again solidifies, securely attaching the mold members to each other for forming mold assembly.
[0085] In the example where a solvent is used to dissolve a portion of a mold member and form a weld between the mold members, the molten material can be located in a simple non-molding location between the mold members, for example , a simple point in a peripheral region surrounding the device-shaped cavity. The molten material can be located in a plurality of non-molding locations between the mold members, for example, 2 or 3 or 4 or 5 or more individual points in a peripheral region, where the plurality of locations are positioned around the perimeter the device-shaped cavity. The plurality of locations can be equidistant from each other around the perimeter of the device-shaped cavity, or can be positioned in a non-symmetrical pattern. The melt region formed between the mold members can be a simple continuous region located around the entire perimeter of the device-shaped cavity. In such an example, although the thickness of the molten thermoplastic may vary across different portions of the adhered region, a simple continuous region of molten material may be present between the mold members and may completely surround the perimeter of the cavity shaped device formed between the mold members.
[0086] In another example, an adhesive substance such as a form of glue, contact cement or sealant can be used to form a bond between the mold members. In yet another example, the mold members can be connected using an additional element such as a clip, clamp or clamp. Regardless of the type of connection used between the mold members, the connection is intended to keep the mold members in alignment during the curing process, and may be able to be released before the demoulding process or as part of the demolding process.
[0087] When at least one of the mold surfaces or mold members of the mold assembly is formed from a water-soluble material, such as, for example, a highly amorphous vinyl alcohol polymer, the mold members of the assembly mold members can be connected in such a way that the mold members cannot be released from each other except by at least partial dissolution of at least one of the mold members of the mold assembly. In other words, the mold assembly, once formed, can be a non-opening mold assembly where the polymeric device body is released by dissolving all or part of the mold members comprising the mold assembly.
[0088] The mold assembly having the polymerizable composition in the device-shaped cavity is then cured. Curing of the polymerizable composition in the device-shaped cavity forms a reaction product polymerized in the form of the device-shaped cavity, that is, a polymeric device body. Curing typically comprises applying a form of electromagnetic radiation to the mold assembly including the polymerizable composition so as to cause polymerization of the polymerizable composition in the mold-shaped cavity of the mold assembly device. The form of electromagnetic radiation may comprise thermal radiation, microwave radiation, visible light, ultraviolet (UV) light, etc. Any combination of two or more forms of electromagnetic radiation, as well as two or more levels of one or more forms of electromagnetic radiation, can be used to cure mold assemblies. The curing process is usually adjusted to the type of initiator used in the polymerizable composition, that is, the polymerizable composition comprising a UV initiator is usually cured using UV light, and a polymerizable composition comprising a thermal initiator is usually cured using thermal radiation, and usually at a temperature above the starting temperature of the thermal initiator. Regardless of the curing process that is used, the temperature during the curing process can be maintained at a temperature below the melting point of the highly amorphous vinyl alcohol polymer, or below the glass transition temperature of the highly amorphous vinyl alcohol polymer. amorphous. The curing process typically involves curing mold assembly until the polymerizable composition has sufficiently polymerized so that the polymeric device body will retain the shape of the device-shaped cavity following mold removal and lens removal. As such, the curing process may not result in a complete reaction of all polymerizable components in the polymerizable composition.
[0089] In one example, microwave radiation can be used to cure the polymerizable composition in a mold assembly formed from at least one highly amorphous vinyl alcohol polymer as described herein. Using microwave radiation to cure the polymerizable composition in a mold formed of highly amorphous vinyl alcohol polymer can reduce the amount of time required to cure the composition compared to using UV light or thermal radiation ((ie, a heated oven) For example, the time required to cure the polymerizable composition in a mold formed of highly amorphous vinyl alcohol polymer using microwave radiation can be less than or equal to 30 minutes, or less than or equal to 20 minutes, or less than or equal to 15 minutes, or less than or equal to 10 minutes. In another example, the polymerizable composition may comprise a thermal initiator such as, for example, 2,2'-azo bis (nitrile isobutyr) (AIBIN, VAZO -64), and the polymerizable composition can be cured using microwave radiation.In another example, the polymerizable composition can comprise a Comfilcon A polymerizable composition containing a thermal initiator such as, for example, AIB N, and the polymerizable composition can be cured using microwave radiation. In yet another example, the polymerizable composition can be cured using microwave radiation, and the polymeric device body can be removed from a wet mold, or lens removed from a wet mold, or both, removed from a wet mold and the lens removed from a wet mold. mold member formed from highly amorphous vinyl alcohol polymer. The wet removal from the mold or the removal of the wet lens, or the removal of the mold and the wet lens can result in a mold member formed of the highly amorphous vinyl alcohol polymer dissolving at least partially. In a particular example, the yield of polymeric device bodies from a manufacturing process involving the use of molds formed from the highly amorphous vinyl alcohol polymer, curing using microwave radiation, and removal of mold and wet lens can be greater than the yield of the same bodies of polymeric devices using the same process but using molds formed from a different material such as, for example, polypropylene, or EVOH.
[0090] When at least one of the device forming molding surfaces (of a molding surface, a mold member or the mold assembly) is formed of a material comprising or consisting of the vinyl alcohol copolymer described herein, during the curing process of the polymerizable composition to form the polymeric device body, the polymerizable composition is in direct contact with the vinyl alcohol copolymer, and at least one surface of the resulting ophthalmic device body is thus formed in direct contact with the copolymer of vinyl alcohol. In some instances, when all molding surfaces forming a device comprise the vinyl alcohol copolymer, all surfaces of the ophthalmic device are formed in direct contact with the vinyl alcohol copolymer.
[0091] As used herein, "demoulding" refers to the process of separating molding surfaces or mold members from the mold assembly following curing of the polymerizable composition. As a result of the demoulding process, the molding surfaces or mold members are separated from each other, and the device body remains in contact with, or attached to, or adhered to one and only one of the molding surfaces or members molds used for melting molding of device body.
[0092] "Dry" demoulding processes involve the use of mechanical processes to separate the mold surfaces or mold members from the mold assembly after curing. In dry demoulding processes, the mold assembly including the polymeric device body is not contacted with a liquid, such as an organic solvent, water or an aqueous solution during the demoulding process, and typically the mold assembly including the polymeric device body was not exposed to a liquid before the dry release process. Following the dry release process, the polymeric device body remains in contact with one, and only one, of the molding surfaces or mold members used to mold the device body. In one example, a dry demoulding process may include compressing one or more of the mold surfaces or mold members to deform the mold surface (s) or mold member (s) and to separate the mold surfaces or mold members, leaving the polymeric device body in contact with one of the mold surfaces or mold members. If the mold surfaces or mold members of the mold assembly are held together at least in part by an interference fit between the mold surfaces or mold members, a dry demoulding process may include applying pressure to one or more of the molding surfaces or mold members in order to push the molding surfaces or mold members away from each other to break the interference fit. If the molding surfaces or mold members of the mold assembly are held together at least in part by a weld between the molding surfaces or mold members, dry demoulding may include cutting through or breaking welded material.
[0093] "Wet" demoulding processes involve the application of a liquid to separate the mold surfaces or mold members from the mold assembly after curing. In wet demoulding processes, the mold assembly including the polymeric device body is contacted with a liquid, such as an organic solvent, water or an aqueous solution, during the demoulding process. Following a wet demoulding process, the polymeric device body can remain in contact with one, and only one, of the molding surfaces or mold members used to mold the device body, or it can be released from both, the molding surfaces or mold members used to mold the device body. Wet demoulding processes may additionally involve the use of mechanical processes for separating molding surfaces or mold members in addition to applying liquid to the mold assembly, including compression of one or more of the mold surfaces or mold members to deform the mold surfaces or mold member (s) by applying pressure to one or more of the mold surfaces or mold members in order to push the mold surfaces or mold members away from each other to break an adaptation of interference, or cutting through welds or an adhesive retaining the mold assemblies together. When an additional mechanical separation step is used, it is typically performed after first applying liquid to the mold assembly, such as, for example, immersing or immersing the mold assembly in a liquid.
[0094] As part of a wet or dry demoulding process, it may be desired if the device body remains in contact with a particular mold surface or mold member, such as the first or second mold member, following the demoulding process. In order to assist the device body to remain in contact with the desired molding surface or mold member, heat can be applied to the first or second molding surface or mold member, for example, by blowing heated air over the rear of the molding surface or mold member. Alternatively, the first or second molding surface or mold member can be cooled, for example, by blowing chilled air over the back of the molding surface or mold member or applying a cooling liquid to one of the surfaces molding or mold members. Applying pressure to the first or second molding surface or mold member prior to demoulding or simultaneously with the demolding process can also help the device body to remain in contact with a particular molding surface or mold member (i.e., the first or second molding surface or mold member) following the demoulding process. In one example, when it is desired to have the polymeric device body remaining in contact with the second molding surface or mold member at the end of the demoulding process, heat can be applied to the back of the first molding surface or mold member immediately before or during the demolding process. Heat can be applied at a temperature below the melting point of the molding surface or mold member. Heat can be applied for a small amount of time such as, for example, less than or equal to 15 seconds, or less than or equal to 10 seconds, or less than or equal to 5 seconds.
[0095] "Lens removal" refers to the process of releasing the device body from a molding surface or mold member with which the device body remains in contact after the molding surfaces or mold members of the assembly mold have been separated in a demolding process. As used herein, "lens removal" can refer to a process involving any optical device body, including an eye insertion body or a contact lens body.
[0096] "Dry" lens removal processes involve the use of mechanical processes to release the device body from a molding surface or remaining mold member with which the device body is in contact following the demoulding step . In dry lens removal processes, the device body and a remaining molding surface or mold member with which the device body is in contact are not contacted by a liquid, such as an organic solvent, water or a solution water, as part of the lens removal process. While it is possible that a wet demoulding process (involving applying a liquid to a mold assembly including a polymeric device body) can be used before a dry lens removal process, it is more common to use a dry demoulding process before of a dry lens removal process. When the dry release and dry lens removal process are used together, the device body has not been exposed to a liquid, for example, an organic solvent, water or an aqueous solution, until after the device body has been released from both, molding surfaces or mold members of the mold assembly (ie, released from both first and second mold surfaces and mold members). In one example, a dry lens removal process may involve the use of a vacuum apparatus to lift the polymeric device body from a molding surface or remaining mold member with which it is in contact following the step of demoulding. A dry lens removal process can also involve compression of a remaining molding surface or mold member to at least partially break the connection between a molding surface or mold member and the lens body. A dry lens removal process may involve blowing air between the edge of the device body and the molding surface or mold member to at least partially break the connection between the device body and the molding surface or mold member. A dry lens removal process may involve inserting a separation tool between the edge of the device body and the molding surface or mold member to at least partially break the connection between the device body and the surface of the device. molding or mold member.
[0097] Following dry demoulding and dry lens removal, the bodies of polymeric devices can be washed (for example, rinsed or extracted or hydrated or any combination thereof) either in a liquid based on organic solvent, or in an essentially free liquid of an organic solvent. Alternatively, following dry release and dry lens removal, the polymeric device body can be placed directly in a package with a packaging solution, sealed, and sterilized.
[0098] "Wet" lens removal processes involve the application of a liquid such as an organic solvent, water or an aqueous solution to release the device body from the remaining impression surface or mold member with which the lens body device is in contact following the demoulding step. After or simultaneously with the application of the liquid, a wet lens removal process may further comprise use of a vacuum apparatus to lift the polymeric device body off a molding surface or remaining mold member with which it was in contact following the demoulding step. Optionally, a wet lens removal process can also include the use of mechanical means to assist in the release of the body device, such as, for example, compression of a molding surface or remaining mold member to break at least partially connecting between a molding surface or mold member, blowing air between the edge of the device body and the molding surface or mold member, or inserting a separation tool between the edge of the device body and the molding surface or mold member to at least partially break the connection between the device body and the molding surface or mold member.
[0099] In one example, when dry demoulding and dry lens removal processes followed by a washing process using a liquid free of an organic solvent are used, or when wet demolding processes, wet lens removal and washing using a liquid free of an organic solvent are used, the resulting device body will not have been exposed to an organic solvent during the manufacturing process. When such a device body that has not been exposed to an organic solvent is subsequently placed in a contact lens package with a packaging solution, sealed and sterilized, the resulting device product will not have been exposed to an organic solvent during its process manufacturing.
[00100] The liquid applied in the wet demoulding process, the wet lens removal process, or both, the wet lens demoulding and removal process can comprise water or an aqueous solution. In one example, the aqueous solution may comprise an aqueous solution of a processing aid that increases the dissolution rate of the highly amorphous vinyl alcohol polymer. In another example, the processing aid may be a compound that aids in the washing of bodies from polymeric devices or that helps in removing a material extractable from the bodies of polymeric devices. In yet another example, the processing aid can be a compound that assists in protecting the device body from damage or deformation during processing, such as, for example, a surfactant, including Tween 80.
[00101] The term "surfactant" refers to a substance that has the ability to reduce the surface tension of water, for example, water or an aqueous solution in which the substance is present. By reducing the surface tension of the water, the surfactant facilitates the water containing the surfactant, when in contact with a polymeric device body that has not previously been subjected to extraction processing with an organic solvent, to more intimately contact the body of device and / or more effectively wash or remove at least one material present in the device body from the device body in relation to water without the surfactant or surfactant component. Generally, a surfactant or surfactant component does not act directly on at least one material to solvate or dissolve at least one material. Examples of surfactants include, without limitation, zwitterionic surfactants including betaine forms, nonionic surfactants including polysorbate forms such as polysorbate 80, poloxamer or poloxamine forms, fluorinated surfactants, and the like and mixtures thereof. In one example, one or more surfactants can be incorporated into the polymerizable compositions described herein, in the washing liquids described herein, in the packaging solutions described herein, and any combination thereof.
[00102] During or following the liquid application step, ultrasonic energy can be applied to the liquid, the mold assembly, the mold member (s), or the mold surface (s). In another example, ultrasonic energy can be applied to the liquid and to a mold assembly, mold member (s), or molding surface (s) contained in a tray.
[00103] The liquid applied to the molding surface (s), or mold member (s), or mold assembly can be applied as part of a wet demolding process, or applied to a device body and a member mold as part of a wet lens removal process, or applied to a device body and a impression surface as part of a wet lens removal process. The temperature of the liquid can be about 90oC or less, about 80oC or less, about 70oC or less, about 60oC or less, about 50oC or less, about 40oC or less, or about 30oC or any less.
[00104] Following release of the polymeric ophthalmic device body from the mold assembly, for example, from all the mold members and molding surfaces used to melt mold the device body, in one example, the vinyl alcohol polymer may not be more present on a surface of the polymeric device body. In other words, once the device body has been released from at least one mold member comprising at least one vinyl alcohol polymer, a layer of at least one vinyl alcohol polymer may not remain on a body surface. device. The release of the device body from at least one mold member can comprise a dry demoulding step or a dry lens removal step or a wet demoulding step or a wet lens removal step. Following release of the device body of at least one mold member comprising at least one vinyl alcohol polymer, a portion of the at least one vinyl alcohol polymer may remain present in solution, and the device body may be present in the solution. However, when the device body is present in the solution, the solubilized portion of the at least one vinyl alcohol polymer may not be chemically or physically attached to or attached to a surface of the device body, and so in this example the vinyl alcohol polymer may be rinsed from the surface of the device body using a solution free of at least one vinyl alcohol polymer. When the solubilized vinyl alcohol polymer can be rinsed from a device body surface in this way, it is understood that the portion of solubilized vinyl alcohol polymer that may have been in contact with a device body surface while the device body was present in the solution does not constitute a "layer" of the vinyl alcohol polymer as used here.
[00105] Depending on the type of device body and the lens demolding / removal processes used, following demoulding and lens removal, the device body can be subjected to one or more washing steps, including washing steps in an organic solvent, an aqueous solution of an organic solvent, water, or an aqueous solution essentially free of an organic solvent. The wash step can be used to clean dirt or debris from device bodies, to extract material from device bodies, or to hydrate device bodies. For example, a washing step can be used to remove diluents from the device body, to remove unreacted or partially reacted monomers from the device body, or to increase the wetting capacity of the device body.
[00106] In one example, the washing solution may comprise an organic solvent or an aqueous solution of an organic solvent. The organic solvent can comprise a volatile organic solvent such as, for example, a volatile alcohol. Examples of volatile alcohols can include lower alcohols, such as forms of methanol, ethanol, propanol, etc.
[00107] As discussed earlier, the term "organic solvent" refers to an organic substance having the ability to solvate or dissolve at least one material. The organic solvent can be used to dissolve unreacted materials, diluents and the like, present in a polymeric device body that has not previously been subjected to extraction processing. In one example, the material is a material that is not soluble or does not dissolve in water or an aqueous solution. In another example, the material is a material that is not soluble or does not dissolve as much in water or an aqueous solution, that is, the material has increased solvation in the organic solvent compared to water or an aqueous solution. Thus, the organic solvent in contact with such a non-extracted device body is effective for solvating or dissolving at least one material present in the device body, or for increasing solvation or dissolving to a greater extent the at least one material present in the device body to reduce the concentration of at least one material in the device body, or to reduce the concentration of at least one material in the device body compared to a device body treated with water or an aqueous solution. The organic solvent can be used without dilution, ie 100% organic solvent, or it can be used in a composition including less than 100% organic solvent, for example, and without limitation, an aqueous solution including an organic solvent. In general, an organic solvent acts, for example, it acts directly on at least one material to solvate or dissolve at least one material.
[00108] In another example, the washing solution may comprise water or an aqueous solution essentially free of an organic solvent. The aqueous solution essentially free of an organic solvent used to wash the present lenses can include aqueous salt solutions, buffer solutions, surfactant solutions, wetting agent solutions, comfort agent solutions, and any combination thereof, and the like. In one example, one or more polymeric wetting agents or comfort agents can be used to wash the present device bodies, or in a packaging solution used with the present device bodies. However, it is understood that the present device bodies can have ophthalmically acceptable wetted surfaces when washed or packaged in an aqueous solution that does not contain any polymeric wetting agents or comfort agents. Thus, although polymeric wetting agents or comfort agents can be used to increase the wetting capacity of such devices, their wetting capacity is not solely dependent on the use of such agents.
[00109] Following release of the device body from the mold surface (s) or mold member (s) or mold assembly and, if used, one or more optional washing steps, the device body can be placed in a blister pack along with a portion of the packaging solution. In one example, the blister pack may comprise a hydrophobic polymer. The blister pack can then be sealed and sterilized, for example, by packaging autoclaving under conditions suitable for packaging sterilization.
[00110] In one example, the process of making an ophthalmic device as described here results in a yield of acceptable bodies of polymeric devices that is greater than a yield of acceptable bodies of polymeric devices manufactured using an essentially identical process, but using first and second mold members comprising an ethylene-vinyl alcohol copolymer instead of at least one highly amorphous vinyl alcohol polymer from the present exhibition. The yield of acceptable device bodies can be a yield of cosmetically acceptable devices, or a yield of ophthalmically acceptable devices. The yield of acceptable devices can be a yield of verified devices that are free of visually detectable defects as determined by manual visual inspection or through automated inspection using an automated inspection system. The yield of acceptable device bodies can be a yield of acceptable devices resulting from a particular processing step, such as, for example, a curing step, or a demoulding step, or a lens removal step, or a washing step, or a packaging step, or any combination of processing steps.
[00111] The highly amorphous vinyl alcohol polymer can be used for melting molding of various types of polymerizable compositions. The polymerizable composition can comprise at least one hydrophilic monomer. The polymerizable composition can further comprise at least one crosslinker, or at least one initiator, or at least one coloring agent, or at least one UV blocker, or any combination thereof. The at least one initiator can comprise at least one UV initiator or at least one thermal initiator. In one example, the hydrophilic monomer may comprise a silicone-free monomer such as, for example, 2-hydroxy ethyl methacrylate (HEMA). In another example, the polymerizable composition can still comprise at least one silicon-containing monomer. In yet another example, the polymerizable composition can be a polymerizable composition which, when polymerized, forms a body of polymeric hydrogel ophthalmic device.
[00112] As used herein, the term "hydrogel" refers to a polymeric material, typically a network or matrix of polymer chains, capable of swelling in water or becoming swollen with water. A hydrogel can also be understood to be a material that retains water in an equilibrium state. The network or matrix may or may not be cross-linked. Hydrogels refer to polymeric materials, including ophthalmic devices, eye inserts and contact lenses that are swellable with water or swell in water. Thus, a hydrogel can be (i) non-hydrated and swelled in water, or (ii) partially hydrated and swelled with water, or (iii) fully hydrated and swelled with water. The hydrogel can be a silicone hydrogel, a silicone-free hydrogel, or an essentially silicone-free hydrogel.
[00113] The term "silicone hydrogel" or "silicone hydrogel material" refers to a particular hydrogel that includes a component containing silicon (Si). For example, a silicone hydrogel is typically prepared by combining a silicon-containing monomer with conventional hydrophilic hydrogel precursors. A silicone hydrogel ophthalmic device is an ophthalmic device, including a vision correction contact lens, which comprises a silicone hydrogel material.
[00114] The polymerizable composition can be a polymerizable composition capable of forming a silicone hydrogel polymer when polymerized. The polymerizable silicone hydrogel composition may comprise a) at least one silicon-containing monomer and b) at least one hydrophilic monomer. In the polymerizable silicone hydrogel composition, the at least one hydrophilic monomer can comprise a hydrophilic monomer with an N-vinyl group. The at least one hydrophilic monomer can comprise a vinyl amide. The at least one silicon-containing monomer of the polymerizable silicone hydrogel composition can be a silicon-containing monomer having a molecular weight greater than 3000 Dalton. The at least one silicon-containing monomer can comprise at least two silicon-containing monomers, each having different numbers of polymerizable groups and different molecular weights. Optionally, the polymerizable silicone hydrogel composition can still comprise a diluent such as, for example, a silicone oil form. In a particular example, the polymerizable silicone hydrogel composition may comprise a polymerizable composition withfilcon A, and the polymerized reaction product may be a polymeric lens body withfilcon.
[00115] When the polymerizable composition comprises a contendosilicon monomer, the composition can still comprise at least one compatible crosslinking agent. In particular examples, the silicone-containing component can act as both a crosslinker and as a silicone-containing component. With respect to polymerizable compositions as discussed here, “compatible” components refer to components that, when present in a polymerizable composition before polymerization, form a simple phase that is stable for an appropriate period of time to allow manufacturing of a polymeric lens body from the composition. For some components, a range of concentrations can be verified to be compatible. Additionally, when the polymerizable composition is used to form a contact lens, “compatible” components are components that, when polymerized to form a polymeric lens body, produce a lens that has adequate physical characteristics to be used as a contact lens (for example, suitable transparency, modulus, tensile strength, etc.).
[00116] "Molecular weight" in the context of a polymer described herein refers to the nominal average molecular weight of a polymer, typically determined by size exclusion chromatography, light scattering techniques, or determination of intrinsic viscosity at 1 , 2,4-trichloro benzene. Molecular weight in the context of a polymer can be expressed as an average numerical molecular weight or an average weight molecular weight, and in the case of materials supplied by suppliers, it will depend on the supplier. Typically, the basis for any such molecular weight determinations can be easily provided by the supplier if not provided in the packaging material. Typically, reference here to molecular weights of monomers, including ma- chromers and prepolymers, or of present polymers refer to the average numerical molecular weight. Both molecular weight, average numeric and average weight determinations can be measured using gel permeation chromatographic techniques or liquid chromatographic techniques. Other processes for measuring molecular weight values can also be used, such as using end group analysis or measuring binding properties (for example, freezing point lowering, boiling point elevation, or osmotic pressure) to determine average numerical molecular weight or the use of light scattering, ultracentrifugation or viscosimetry techniques to determine average molecular weight.
[00117] The hydrophilicity or hydrophobicity of a substance can be determined using conventional techniques, such as, based on the aqueous solubility of the substance. For the purposes of the present exhibition, a hydrophilic substance is a substance that is visibly soluble in an aqueous solution at room temperature (for example, about 20-25oC). For example, a hydrophilic monomer can be understood to be any monomer for which 50 grams or more of the monomer is visibly entirely soluble in 1 liter of water at 20oC (that is, the monomer is soluble at a level of at least 5% weight / weight in water) as determined using a standard shake bottle process as known to those skilled in the art. A hydrophobic substance, as used herein, is a monomer that is visibly insoluble in an aqueous solution at room temperature, so that visually identifiable, separate phases are present in the aqueous solution, or so that the aqueous solution appears cloudy and separates in two distinct phases with time after resting at room temperature. For example, a hydrophobic monomer can be understood to be any monomer for which 50 grams of the monomer are visibly not fully soluble in 1 liter of water at 20oC (that is, the monomer is soluble at a level of less than 5% by weight / weight in water).
[00118] A "monomer" refers to a polymerizable compound, regardless of the molecular weight of the compound. Thus, a monomer can be a low molecular weight monomer, a macromer, or a prepolymer as described below.
[00119] A "low molecular weight monomer" refers to a relatively low molecular weight compound, for example, a compound with an average molecular weight of less than 700 Dalton that is polymerizable. In one example, a low molecular weight monomer may comprise a single unit of a molecule containing one or more functional groups capable of polymerizing to combine with other molecules to form a polymer, the other molecules being of the same or different structures as the low molecular weight monomer.
[00120] A "macromer" refers to compounds or polymers of medium to high molecular weight, which may contain one or more functional groups capable of polymerization or even polymerization. For example, a macromer can be a compound or polymer with an average molecular weight of about 700 Dalton to about 2000 Dalton.
[00121] A "prepolymer" refers to a polymerizable or crosslinkable compound for greater molecular weight. A prepolymer, as used herein, may contain one or more functional groups. In one example, a prepolymer can be a series of monomers or macromers linked together so that the total molecule remains polymerizable or crosslinkable. For example, a prepolymer can be a compound with an average molecular weight greater than about 2000 Dalton.
[00122] A "polymer" refers to a material formed by polymerizing one or more monomers, macromers, prepolymers or mixtures thereof. As used herein, a polymer is understood to refer to a molecule that is not capable of being polymerized, but is capable of being cross-linked to other polymers, for example, to other polymers present in a polymerizable composition or during the reaction of monomers, macromers and / or prepolymers for forming other polymers in a polymerizable composition.
[00123] A "network" of a hydrophilic polymer typically means that crossings are formed between polymer chains through covalent bonds or through physical bonds, for example, hydrogen bonds. A network can include two or more polymeric components, and can include an inter-penetrating network (IPN) in which a polymer is physically entangled with a second polymer so that there are few, if any, covalent bonds between them, but the polymers they cannot be separated from each other without destroying the network.
[00124] An "inter-penetrating network" or "IPN" refers to a combination of two or more different polymers, in the form of a network, of which at least one is synthesized (for example, polymerized) and / or reticulated in presence of the other without or substantially without any covalent bonds between them. An IPN can be composed of two types of chains forming two separate networks, but in juxtaposition or inter-penetrating. Examples of IPNs include sequential IPNs, simultaneous IPNs and homo-IPNs.
[00125] A "pseudo-IPN" refers to a polymeric reaction product where at least one of the different polymers is cross-linked while at least one other polymer is non-cross-linked (for example, linear or branched), where the polymer does not - crosslinked is distributed in, and retained by the crosslinked polymer on a molecular scale so that the non-crosslinked polymer is substantially non-extractable from the network.
[00126] Hydrophilic monomers, including silicon-free hydrophilic monomers, are included in the polymerizable compositions used for the manufacture of silicone present hydrogels. Silicon-free hydrophilic monomers exclude compounds that contain one or more silicon atoms. Hydrophilic monomers can be used in combination as monomers, macromers or prepolymers containing silicon in the polymerizable compositions for forming silicon hydrogels. In silicone hydrogels, hydrophilic monomer components include those that are capable of providing at least about 10% (weight / weight), or even at least about 25% (weight / weight) water content for the resulting hydrated lens when combined with the other components of polymerizable composition. For silicone hydrogels, the total hydrophilic monomers can be from about 2% 9 weight / weight) to about 75% (weight / weight), or about 35% (weight / weight) to about 65% (weight / weight), or from about 40% (weight / weight) to about 60% (weight / weight), of the polymerizable composition.
[00127] Monomers that can be included as hydrophilic monomers typically have at least one polymerizable double bond, at least one hydrophilic functional group, or both. Examples of polymerizable double bonds include, for example, vinyl, acrylic, methacrylic, acrylamide, methacrylamide, fumaric, maleic, styrene, isopropenyl phenyl, O-vinyl carbonate, O-vinyl carbamate, allyl double bonds -vinyl acetyl and N-vinyl lactam and N-vinyl starch. In one example, hydrophilic monomers contain vinyl (for example, an acrylic-containing monomer or a non-acrylic vinyl-containing monomer). Such hydrophilic monomers can themselves be used as crosslinking agents.
[00128] Hydrophilic vinyl-containing monomers that can be incorporated into the materials of the present lenses include, without limitation, the following: N-vinyl lactams (eg, N-vinyl pyrrolidone (NVP)), N-vinyl-N-methyl acetamide (VMA), N-vinyl-N-ethyl acetamide, N-vinyl-N-ethyl formamide, N-vinyl formamide, N-2-hydroxy ethyl vinyl carbamate, N-carboxy-beta-alanine N-vinyl ester, and the like and mixtures thereof. An example of a vinyl-containing monomer is N-vinyl-N-methyl acetamide (VMA). The VMA structure corresponds to CH3C (O) N (CH3) -CH = CH2. Hydrophilic monomers that can be incorporated into the polymerizable composition also include hydrophilic monomers such as N, N-dimethyl acrylamide (DMA), 2-hydroxy ethyl acrylate, glycerol methacrylate, 2-hydroxy ethyl methacrylate, N-vinyl pyrrolidone (NVP) and polyethylene glycol mono methacrylate. In certain examples, hydrophilic monomers including DMA, NVP and mixtures thereof are employed.
[00129] According to the present disclosure, a crosslinking agent is understood to be a monomer having more than one polymerizable functional group as part of its molecular structure, such as two or three or four functional groups, that is, a monomer multifunctional such as a bifunctional or trifunctional or tetrafunctional monomer. One or more non-silicon crosslinking agents that can be used in the polymerizable compositions shown herein include, for example, without limitation, allyl (meth) acrylate, or lower alkylene glycol di (meth) acrylate, or di (meth) acrylate poly (lower alkylene) glycol, or lower alkylene di (meth) acrylate, or divinyl ether, or divinyl sulfone, or di- and trivinyl benzene, or trimethylol propane tri (meth) acrylate, or tetra (meth) acrylate pentaerythritol, or bisphenol A di (meth) acrylate, or methylene bis (meth) acrylamide, or trialyl phthalate, or diallyl phthalate, or ethylene glycol dimethacrylate (EGDMA), or triethylene glycol dimethacrylate (TEGDMA), or triethylene glycol di-vinyl ether (TEGDVE), or trimethylene glycol dimethacrylate (TMGDMA), or any combination thereof. In one example, the crosslinking agent can have a molecular weight of less than 1500 Dalton, or less than 1000 Dalton, or less than 500 Dalton, or less than 200 Dalton. Typically, crosslinking agents are present in the polymerizable silicone hydrogel composition in relatively small total amounts in the polymerizable composition, such as in an amount ranging from about 0.1% (weight / weight) to about from 10% (weight / weight), or from about 0.5% (weight / weight) to about 5% (weight / weight), or from about 0.75% (weight / weight) to about 1 , 5% (weight / weight), by weight of the polymerizable composition.
[00130] In some examples, one or more of the monomers may comprise cross-linking functionality (that is, the monomer may be multifunctional). In such cases, the use of an additional crosslinker in addition to the monomer, macromer or prepolymer with crosslinking functionality is optional, and the monomer, macromer or prepolymer with crosslinking functionality may be present in the composition. polymerizable silicone hydrogel in greater quantity, such as, for example, at least about 3% (weight / weight), at least about 5% (weight / weight), at least about 10% (weight / weight) , or at least about 20% (weight / weight).
[00131] Useful silicon-containing components comprise polymerizable functional groups such as vinyl, acrylate, methacrylate, acrylamide, methacrylamide, N-vinyl lactam, N-vinyl amide, and styrene functional groups. The polymerizable compositions as described herein can be based on a monomer containing silicon, including a low molecular weight monomer containing silicon, or a contendosilicon macromer, or a prepolymer containing silicone, or any combination thereof, and a hydrophilic monomer or comonomer, and a crosslinking agent. In one example, the polymerizable composition of the present exhibit may comprise at least two silicon-containing monomers, each having a different molecular weight. Examples of silicon-containing components that may be useful in the present lenses can be found in U.S. patents 3,808,178, 4,120,570, 4,136,250, 4,139,513, 4,153,641, 4,740,533, 5,034,461, 5,496,871, 5,959,117, 5,998,498, 5,981,675, and 5,998,498; US patent application publication 2007/0066706, 2007/0296914, 2008/0048350, 2008/0269429, and 2009/0234089 and Japanese patent application number 2008-202060A, all of which are incorporated by reference in their totalities.
[00132] Polymerizable compositions for use as described herein can include one or more hydrophobic monomers, including silicon-free hydrophobic monomers. Examples of such hydrophobic silicon free monomers include, without limitation, acrylic and methacrylic acids and their derivatives, including methyl methacrylate. Any combination of two or more hydrophobic monomers can be employed. Illustrative acrylic monomers that can be used in the polymerizable composition include N, N-dimethyl acrylamide (DMA), 2-hydroxy ethyl acrylate, glycerol methacrylate, 2-hydroxy ethyl methacrylate (HEMA), methacrylic acid, acrylic acid, methacrylate methyl (MMA), methyl ethyl glycol methyl methacrylate (EGMA), and any mixtures thereof. In one example, the total acrylic monomer content is in an amount ranging from about 5% (weight / weight) to about 50% (weight / weight) of the polymerizable composition used to prepare a silicon hydrogel lens product. - cone, and can be present in an amount ranging from about 10% (weight / weight) to about 40% (weight / weight), or from about 15% (weight / weight) to about 30% (weight / weight) of the polymerizable composition.
[00133] Additional hydrogel components. The polymerizable compositions used in the lenses and processes described herein may also include additional components, for example, one or more initiators, such as one or more thermal initiators, one or more ultraviolet (UV) initiators, visible light initiators, any or combination thereof, and the like, one or more UV absorbing agents or compounds, or energy absorber or UV radiation, coloring agent, pigments, release agents, antimicrobial compounds, and / or other additives. The term "additive" in the context of the present exhibition refers to a compound or any chemical agent provided in the present polymerizable hydrogel contact lens compositions or polymerized hydrogel contact lens products, but which is not required for manufacture of a hydrogel contact lens.
[00134] The polymerizable compositions may comprise one or more initiator compounds, that is, a compound capable of initiating the polymerization of a polymerizable composition. Thermal initiators, that is, initiators having a “start” temperature, can be used. For example, exemplary thermal initiators that can be employed in the present polymerizable compositions include 2,2'-azo bis- (isobutyronitrile) (AIBN, VAZO-64), 2,2'-azo bis (2,4-dimethyl pentane nitrile) (VAZO-52), 2,2'-azo bis (2-methyl butyryl nitrile) (VAZO-67), and 1,1'-azo bis (hexane carbonitrile cycle) (VAZO-88). For VAZO thermal initiators, the degree number (ie 64, 52, 67, 88, etc.) is the Celsius temperature at which the half-life of the initiator in solution is 10 hours. All VAZO thermal initiators described herein are available from DuPont (Wilmington, Del., USA). Additional thermal initiators, including nitrites as well as other types of initiators, are available from Sigma Aldrich. Ophthalmically compatible silicone hydrogel contact lenses can be obtained from polymerizable compositions ranging from about 0.05% (weight / weight) to about 0.8% (weight / weight), or about 0.1% (weight / weight) to about 0.6% (weight / weight) of VAZO-64 or another thermal initiator.
[00135] Polymerizable compositions may also comprise a demoulding aid, that is, one or more ingredients effective in making it easier to remove cured contact lenses from their molds. Exemplary release agents include hydrophilic silicones, polyalkylene oxides, and any combination thereof. The polymerizable compositions may additionally comprise a diluent selected from the group consisting of hexanol, ethoxy ethanol, isopropanol (IPA), propanol, decanol, and any combination thereof. Diluents, if used, are typically present in amounts ranging from about 10% (weight / weight) to about 30% (weight / weight). Compositions having relatively higher concentrations of diluents tend to, but not necessarily, have lower ion flow values, reduced modulus, and increased elongation, as well as water break times (WBUTs) greater than 20 seconds. Additional materials suitable for use in the manufacture of hydrogel contact lenses are described in US patent 6 867 245, the disclosure of which is incorporated herein in its entirety by reference. In certain examples, however, the polymerizable composition is free of solvent.
[00136] In a particular example of a polymerizable composition, the composition comprises a first monomer having a first reactivity ratio, and a second monomer having a second reactivity ratio which is less than the first reactivity ratio. As understood by those skilled in the art, a reactivity ratio can be defined as the ratio of the reaction rate constant of each species of propagation by adding its own monomer to the rate constant for its addition to other monomers. Such compositions may also include at least one cross-linking agent having a reactivity ratio similar to the first reactivity ratio or the second ratio. Such compositions can also include at least two cross-linking agents, the first cross-linking agent having a reactivity ratio similar to the first reactivity ratio, and the second cross-linking agent having a reactivity ratio similar to the second reactivity ratio. In certain examples, the precursor lens compositions may include one or more removable additives. For example, polymerizable compositions may include one or more compatibilizers, release agents, lens removal aids, wetting capacity enhancers, and ion flow reducers that are removable.
[00137] Silicone hydrogel contact lenses are based on polymerizable lens formulations that include silicon containing monomers, including low molecular weight monomers, macromers, prepolymers or any combination thereof, and at least a hydrophilic monomer, as previously described. Some examples of silicone hydrogel contact lens materials include materials having the following USANs: acquafilcon A or aquafilcon B, balafilcon A, comfilcon A, enfilcon A, galyfilcon A, lenefilcon A, lotrafilcon A, lotrafilcon B, senofilcon A, narafilcon A, and filcon II 3. In one example, the lens body with ophthalmically acceptable anterior and posterior surfaces without applying a surface treatment to the lens body, or without the presence of an intermediary polymeric mesh penetrating agent (IPN) of a polymeric wetting agent in the lens body is a silicone hydrogel contact lens body comfilcon A.
[00138] Ophthalmic devices comprise bodies that have surfaces, such as an anterior surface and a posterior surface. As used herein, an ophthalmically acceptable ophthalmically moisturizing device is a device having surfaces that are all ophthalmically acceptably moisturizing. Wetting capacity refers to the hydrophilicity of one or more surfaces of a device. As used herein, a surface of a device can be considered ophthalmically acceptable wetting if the device receives a score of 3 or above in a wetting capacity test as follows. An ophthalmic device is immersed in distilled water, removed from the water, and the length of time it takes for the water film to be pulled from the device surface is determined (for example, water break time (WBUT)) . The test grades are on a 1-10 linear scale, where a score of 10 refers to a device in which a drop takes 20 seconds or more to fall from the device. A device having a WBUT of more than 5 seconds, such as at least 10 seconds or more desirably at least about 15 seconds, can be a device having ophthalmically acceptable surfaces. Wetting capacity can also be determined by measuring a contact angle on one or both device surfaces. The contact angle The contact angle can be a dynamic or static contact angle, a sessile drop contact angle, a drop drop contact angle, or a captive bubble contact angle. Smaller contact angles generally refer to the increased wetting capacity of a device surface. For example, an ophthalmically acceptable wetted surface of a device may have a contact angle of less than about 120 degrees. However, in certain instances, devices may have a contact angle of no more than 90 degrees, and yet in examples, the device may have a contact angle in advance of less than about 80 degrees.
[00139] The fusion-molded ophthalmic devices using a highly amorphous vinyl alcohol polymer shown here may have ophthalmically acceptable surfaces when fully hydrated, and may not require a surface treatment or the presence of an IPN or pseudo-IPN of a polymeric wetting agent in the device body so that the lens has ophthalmically acceptable surfaces. However, applying a surface treatment to the device or the presence of a polymeric wetting agent IPN or pseudo-IPN in the device body can be used to further increase the wetting capacity of the device surfaces above a level. which is considered ophthalmically acceptable.
[00140] An "ophthalmically compatible silicone hydrogel device" refers to a silicone hydrogel ophthalmic device, such as a contact lens, that can be used on a person's eye without the person experiencing it or report substantial discomfort, including eye irritation and the like. When the device is a contact lens, such lenses often have an oxygen permeability, a surface wetting capacity, a modulus, a water content, an ion flow ,. A design, and any combination thereof, that allows the lenses to be worn comfortably in a patient's eye for extended periods of time, such as at least one day, at least one week, at least two weeks, or about a month without require removal of the lens from the eye. Typically, ophthalmically compatible silicone hydrogel devices do not cause or are not associated with significant corneal swelling, corneal dehydration (“dry eye”), arched upper epithelial lesions (“SEALs”), or other significant discomfort. Ophthalmically compatible silicone hydrogel contact lenses meet clinical acceptability requirements for contact lenses for daily use or extended use.
[00141] Ophthalmically compatible silicone hydrogel devices have ophthalmically acceptable surfaces, although a device with ophthalmically acceptable surfaces may not necessarily be ophthalmically compatible. A silicone hydrogel contact device having an "ophthalmically acceptable wetable surface" can be understood to refer to a silicone hydrogel device that does not adversely affect the tear film of a device user eye to a degree that results in device user experiencing or reporting discomfort associated with placing or using a silicone hydrogel device over an eye.
[00142] A process for manufacturing ophthalmic devices, for example, silicone hydrogel contact lenses, is illustrated in Fig. 1. According to the present exhibition, all the steps illustrated in Fig. 1, or a subset of the steps illustrated in Fig. 1 can comprise a contact lens manufacturing process. Items that serve as inputs, outputs or both, inputs and outputs of steps in Fig. 1 are illustrated in Fig. 2.
[00143] Fig. 1 includes a step 102 of supplying a highly amorphous alcohol solvent polymer from the present exhibition. The highly amorphous vinyl alcohol polymer is illustrated in Fig. 2 as element 202.
[00144] Step 104 of Fig. 1 illustrates the step of using highly amorphous vinyl alcohol polymer to form at least one of a first mold member and a second mold member, or to form at least one molding surface of at least one of a first mold member and a second mold member. The element 204 of Fig. 2 illustrates the resulting mold member (s) or molding surface (s) comprising the highly amorphous vinyl alcohol polymer.
[00145] Fig. 1 also includes a step 106 of placing a polymerizable composition on or in a mold member or molding surface. With reference to the present disclosure, the polymerizable composition can be understood to be a polymerizable composition, such as, for example, a silicon-containing polymerizable composition capable of forming a silicone hydrogel polymer when polymerized. The polymerizable composition is illustrated in Fig. 2 as element 206. The polymerizable composition can be understood to be a prepolymerized or pre-cured composition suitable for polymerization.
[00146] Typically, the polymerizable composition is not polymerized prior to curing or polymerizing the composition. However, polymerizable compositions can be partially polymerized before undergoing a curing process. In some examples, the polymerizable composition may comprise a polymer component which becomes cross-linked with other components of the polymerizable composition during the curing process. The polymeric component can be a wetting agent or a comforting agent. Alternatively, the polymeric component may be a polymeric component that is not a polymeric wetting or comforting agent, that does not form an inter-penetrating or pseudo-IPN polymeric network in the lens body, or that is not even a comfort agent or polymeric humectant and does not form an IPN or pseudo-IPN in the lens body.
[00147] The present polymerizable compositions can be provided in containers, dispensing devices, or mold members prior to a curing or polymerization procedure, as described herein. Referring again to Fig. 1, in step 106, the polymerizable composition is placed on a molding surface forming device (i.e., a region used to mold a portion of an ophthalmic device such as a lens surface) of a female mold member or a male mold. The female mold member can be understood to be a first mold member or an anterior mold member, and the male mold member can be understood to be a second mold member or a posterior mold member. For example, the female mold member comprises a molding surface that defines the front or front surface of a lens produced from the lens mold. The second mold member can be understood to be a male mold member or a posterior mold member. For example, the second mold member includes a molding surface that defines the back surface of a device such as a lens produced in the mold member (for example, the second mold member or male mold member may have a surface convex lens forming mold).
[00148] Still referring to the present exhibition, at least one of the first and second mold members, or a molding surface of at least one of the first and second mold members comprises, includes, includes a greater amount of, consists essentially in, or consists of, at least one highly amorphous vinyl alcohol polymer as described herein. In one example, the mold member (s) or molding surface (s) as described herein was produced to have molding surfaces with sufficient degrees of polarity for producing silicone hydrogel contact lenses having acceptably wetted surfaces. - thalmically. The water-soluble vinyl alcohol copolymer may have a polarity of about 1% to about 70%, or from about 1% to about 50%, or from about 1% to about 10%, or from about 10% to about 45%, or from about 20% to about 40%, or from about 30% to about 45%, or from about 20% to about 30%.
[00149] The average polarity of the polymer can be determined based on the Owens - Wendt - Rabel - Kaebel model, where the contact angle of the thermoplastic polymer is determined using a number of different liquids of known polarities. The Owens-Wendt-Rabel-Kaebel equation can be written in the form of a linear equation, where y is calculated based on the observed contact angle of each of the different liquids with the polymer (θ) and x is calculated based on the polar components (OLP) and dispersed (OLD) of the total surface energy (OLT) of each of the different liquids. The data points of the different liquids (x, y) can be plotted, and the linear regression of the graph can then be used to determine the slope (m) and y-intersection (b). The calculated slope and y-intersection can be used to calculate the polar (oSP) and dispersed (oSD) components of the total surface energy of the polar thermoplastic polymer (oST, where oST = oSP + oSD).
[00150] The Owens-Wendt-Rabel-Kaebel Equation in the form of a linear equation:

[00151] Examples of liquids with different polarities that can be used to determine the polarity of the polymer include, but are not limited to, deionized water, methane diiodine, dimethyl sulfoxide (DMSO), and formamide. In selecting liquids with different polarities, ideally, a number of liquids having a range of polarities based on the polar component of the liquid (OLP) of total surface energy can be selected, rather than selecting a number of liquids with different total surface energies (OLT). Using this process, the average polarity of the polymer is calculated by dividing the calculated polar component (osP) of total surface energy for the polymer through its calculated total surface energy (osT) and multiplying by 100 to obtain the polarity percentage.
[00152] To form a mold assembly, the first mold member is placed in contact with a second mold member, forming a device-shaped cavity in the space between the first mold member and the second mold member. The process illustrated in Fig. 1 includes a step 108 of forming a contact lens mold assembly by placing two contact lens mold members in contact with each other to form a shaped cavity between them. of lens. For example, with reference to Fig. 2, following step 108, the polymerizable silicone hydrogel composition 206 is located in the contact lens-shaped cavity.
[00153] In step 110, the process illustrated in Fig. 1 includes curing a polymerizable composition to form a polymeric device body that is contained in a mold assembly, as illustrated in Fig. 2 as element 208. At this point in the process, the polymeric lens body has not been exposed to liquid. In one example, the polymeric lens body may be a polymerized silicone hydrogel contact lens body. During curing, the components of the polymerizable composition polymerize to form a polymeric lens body. Thus, curing can also be understood to be a polymerization step. The cure 110 may include exposing the polymerizable lens precursor composition to a form of effective electromagnetic radiation in polymerizing components of the lens precursor composition. For example, cure 110 may include exposure of a polymerizable composition to polymerizing amounts of heat, microwave radiation or ultraviolet (UV) light, among other forms of electromagnetic radiation. Cure 110 can also include curing compositions in an oxygen-free or approximately oxygen-free environment. For example, cure 110 can occur in the presence of nitrogen or other inert gases. Curing 110 can be effective to fully polymerize the polymerizable composition, or it can polymerize the polymerizable composition to a level such that the lens body when processed (e.g., demoulded, lens removed, washed, packaged, sterilized, etc.). ) is able to properly retain its molded shape to serve as a contact lens.
[00154] A polymeric device body that has not been exposed to a liquid can be present at various stages in the manufacturing process, depending on the types of demoulding and lens removal processes used, and whether or not one or more optional washing steps are performed. For example, a polymeric lens body that has not been exposed to a liquid can be a polymeric lens body before undergoing a wet demoulding process, or a wet lens removal process, or a wet lens removal and demolding process , or an optional washing process, or any combination thereof. For example, the washing process can be a cleaning process to remove dust or debris, or an extraction process to remove a portion or substantially all of one or more components extractable from the polymeric lens body, or a hydration process to partially or fully hydrate the hydrogel lens body, or any combination thereof. For example, the polymeric lens body that has not been contacted by a liquid can comprise a lens body present in a lens-shaped cavity of a mold assembly or two molding surfaces after a curing process, or it can comprise a lens body in contact with one and only one mold member following a wet release process, or it may comprise a contact lens body in a tray or other device following dry lens removal processes. The polymeric lens body that has not been exposed to a liquid can include a lens forming component, such as a polymeric network containing silicon or matrix in the form of a lens, and a removable component that can be removed from the lens body following polymerization. . The removable component can be understood to include unreacted monomers, oligomers, partially reacted monomers, or other agents that have not become covalently bound or otherwise immobilized in relation to the lens-forming component. The removable component can also be understood to include one or more additives, including thinners, which can be removed from the polymerized lens product during a cleaning, extraction, or hydration procedure, as discussed herein. Thus, removable component materials may include non-crosslinked or slightly crosslinked or branched linear polymers of extractable materials that are not crosslinked to, or otherwise immobilized, in relation to the polymer backbone, network, or matrix of the lens body.
[00155] After curing polymerizable compositions, the process illustrated in Fig. 1 includes a step 112 of separating the polymeric device body from the mold members of the mold assembly. In one example, the process of separating the polymeric lens body from the mold member may comprise a demoulding process resulting in the polymeric lens body remaining in contact with one, and only one, mold member from the mold members used to form the polymeric lens body. Following the demoulding process, the polymeric lens body is located on, or remains in contact with, just one of the mold members of the mold assembly. One and only one mold member with which the polymeric lens body remains in contact following demoulding may be the mold member 204 formed using the highly amorphous vinyl alcohol polymer 202, or it may be a different mold member. When the step 112 of separating the polymeric lens body from the mold members comprises a demoulding process, the separation step can further include a step of removing the lens releasing the polymeric lens body of one and only one mold member with the which he remained in contact following the demoulding process. The polymeric lens body can be removed from the male mold member or the female mold member, depending on which mold member the polymeric lens body remains in contact following the demoulding process. Alternatively, step 112 may comprise a process of removing the lens and demolding in combination, where the lens body is released simultaneously from all the mold members used for its formation. When at least one of the mold members or molding surfaces used to form the lens body comprises a highly amorphous vinyl alcohol polymer, the separation process may involve applying a liquid to the lens body and at least one mold member or molding surface (in the form of a mold assembly, a simple mold member, a pair of molding surface or a simple molding surface, the molding surface (s) being either in contact with, or separated from, a portion ( s) non-molding of the mold member (s) to at least partially dissolve the highly amorphous vinyl alcohol polymer and thereby release the lens body from the mold assembly, single mold member or molding surface (s). The liquid used in a wet separation process can comprise water or an aqueous solution.
[00156] The process illustrated in Fig. 1 optionally includes a device body washing step 114. The washing step may comprise contact of a polymeric lens body with a liquid, for example, an organic solvent, a solution of organic solvent, water or an aqueous solution free of an organic solvent, for cleaning dust or debris at from the lens body, or to extract the lens body to remove extractable materials from the lens body, or to hydrate the lens body, in whole or in part, or any combination thereof. In one example, the washing step 114 may comprise a washing step to remove or dilute the liquid used during a wet demoulding process, a wet lens removal process, or both. The washing step 114 results in a clean, extracted or hydrated lens body 210, as shown in Fig. 2. The washing step 114 can optionally be conducted on a mold assembly including a polymeric lens body, a lens body polymeric remaining in contact with a mold member, a polymeric lens body that has been completely released from all the molds used for its formation, and can be conducted repeatedly during the manufacturing process.
[00157] The washing step 114 may optionally include a polymeric device body hydration step. The hydration step may include contacting a polymeric lens body or one or more batches of such polymeric lens bodies with water or an aqueous solution to form a hydrated lens product, such as, for example, a contact lens. silicone hydrogel. The hydration step can partially or fully hydrate the lens body. In one example, the polymeric lens body that is hydrated in the hydration step is a removed polymeric lens body that was not contacted by a liquid prior to the hydration step, or it may comprise a polymeric lens body that was previously contacted by a liquid.
[00158] After the separation step 112, and the optional washing step 114, the process illustrated in Fig. 1 may optionally include a device body packaging step 116 to produce a packaged ophthalmic device product 212 For example, a lens body can be placed in a blister pack, bottle or other appropriate container along with a volume of a packaging liquid, such as a saline solution, including buffered saline solutions. In one example, washing step 114 and packaging step 116 can be carried out simultaneously by placing a polymeric lens body, including a polymeric lens body that has not been previously contacted by a liquid, in a package blister or container with a portion of packaging liquid that serves as a packaging solution and a washing solution.
[00159] Optionally, the process illustrated in Fig. 1 can still comprise one or more inspection steps 118. In the example illustrated in Fig. 1, the inspection step is carried out following the packaging step, before packaging is carried out. - washed and sterilized, although one or more inspection steps can be carried out at any point in the process, both before curing and after curing, on a dry device body or a wet device body. For example, an inspection can be performed on one or more mold members to determine the acceptability of the mold surfaces, it can be performed on a mold member following placement of the polymerizable composition to detect the presence of bubbles in the polymerizable composition, on a dry lens following curing to determine the acceptability of the dry lens body, or on a wet lens body following separation, washing or packaging to determine the acceptability of the wet lens body. The result of optional inspection step (s) 118 as illustrated in Fig. 1 is a packaged inspected body 214, but in other processes it may comprise an inspected mold member, a polymerizable composition inspected on a mold member, a lens body inspected, or a wet lens body inspected.
[00160] Following step 116 of body device packaging, the blister pack or container containing the packed device body 212 can be sealed, and subsequently sterilized, as shown in optional step 120 of Fig. 1, to produce a sterile packaging comprising a dysphophophthalmic product such as, for example, a contact lens. The packaged device body can be exposed to sterilizing amounts of radiation, including heat such as through autoclaving, gamma radiation, electron beam radiation, ultraviolet radiation, and the like. Depending on the previous process steps used, the sterilization process can also serve to partially or fully extract, hydrate entirely, or both extract and hydrate the packaged device body, or to dissolve the limb (s) of mold or molding surface (s) comprising the highly amorphous vinyl alcohol polymer.
[00161] The following non-limiting examples illustrate certain aspects of the present methods and devices. Example 1 (Comparative, Theoretical)
[00162] A quantity of ethylene-vinyl alcohol copolymer is provided in granular or pellet form. A portion of the polymer is processed through conventional injection molding into first and second contact lens mold members. A polymerizable composition for producing silicone hydrogel contact lenses is prepared as described herein, and is used to prepare a plurality of fusion-molded polymerized silicone hydrogel lens bodies as illustrated in Fig. 1. mold including the polymerizable composition are cured using thermal or UV radiation. After curing, the mold assemblies including the melted molded polymerized lens bodies are demoulded wet or dry to separate two mold members from the mold assembly. Following the dry demoulding step, a dry lens removal process is used to free the polymerized lens bodies from the mold member with which they remain in contact following the demolding step. The released lens bodies are subsequently either washed using a liquid comprising an organic solvent followed by an aqueous solution essentially free of an organic solvent, or are washed using an aqueous solution essentially free of an organic solvent. The washing step can include an additional hydration step, or a separate hydration step can be included before lens bodies are packaged and sterilized. The yield of acceptable lens bodies is below about 65%. Example 2 (Theoretical)
[00163] A quantity of highly amorphous vinyl alcohol polymer is provided in granular or pellet form. A portion of the polymer is processed through conventional injection molding into contact lens mold members. A polymerizable composition for producing silicone hydrogel contact lenses is prepared as described herein, and is used to prepare a plurality of melt-molded polymerized silicone hydrogel lens bodies as illustrated in Fig. 1. The Mold assemblies including the polymerizable composition are cured using thermal radiation, microwave or UV. After curing, mold assemblies including melt-molded polymerized lens bodies are demoulded wet or dry to separate two mold members from the mold assembly. Following the dry demoulding step, a wet lens removal process is used to release the polymerized lens bodies from the mold member with which they remain in contact following the demolding step. The released lens bodies are subsequently either washed using a liquid comprising an organic solvent followed by an aqueous solution essentially free of an organic solvent, or are washed using an aqueous solution essentially free of an organic solvent. The wash step can include an additional hydration step, or a separate hydration step can be included before lens bodies are packaged and sterilized. The yield of acceptable lens bodies is greater than about 75%. When the manufacturing process involves minimal handling of the lens body, where the mold assembly is placed in the blister packaging and the lens body is demoulded and the lens removed by dissolving the mold assembly in the blister packaging, followed by lens body wash in the blister package, the yield of acceptable lens bodies is greater than about 85%. Example 3 (Theoretical)
[00164] A quantity of highly amorphous vinyl alcohol copolymer is provided in granular or pellet form. A portion of the polymer is processed through conventional injection molding into male and female contact lens mold members. A polymerizable composition for producing silicone hydrogel contact lenses is prepared as described herein, and is used to prepare a plurality of melt-molded polymerized silicone hydrogel lens bodies as illustrated in Fig. 1. Mold assemblies including the polymerizable composition is cured using thermal or UV radiation. After curing, mold assemblies including melt-molded polymerized lens bodies are simultaneously demoulded and lenses removed wet by placing mold assembly including the polymeric lens body in a tray, and applying a liquid to the assembly of mold to at least partially dissolve the vinyl alcohol copolymer, thereby releasing the lens body from both molds of the mold assembly. Optionally, mold assemblies, mold members, or liquid can be agitated during the lens removal and demolding steps. The released lens bodies are subsequently transferred to a blister pack with packaging solution, and are sealed and sterilized.

权利要求:
Claims (19)
[0001]
1. Process for manufacturing an ophthalmic device CHARACTERIZED by the fact that it comprises: (a) providing at least one highly amorphous vinyl alcohol polymer (202) having an average level of crystallinity of less than 35%; (b) using at least one vinyl alcohol polymer (202) to form at least one of a first mold member (204) and a second mold member (204), the first mold member (204) comprising a surface molding (204) configured to mold a front surface of an ophthalmic device and the second mold member (204) comprising a molding surface (204) configured to mold a back surface of an ophthalmic device, the first mold member (204 ) and the second mold member (204) configured to form an ophthalmic device-shaped cavity between them when combined as a mold assembly; (c) placing a polymerizable composition (206) comprising at least one hydrophilic monomer in the first mold member (204) or the second mold member (204); (d) assembling the mold assembly by contacting the first mold member (204) and the second mold member (204) so as to form the ophthalmic device-shaped cavity between them with the polymerizable composition (206) held in the cavity in the form of an ophthalmic device of the mold assembly; and (e) curing the polymerizable composition (206) in the mold assembly to form a polymerized reaction product melt-molded in the mold assembly ophthalmic cavity, the polymerized reaction product comprising an ophthalmic device body. polymeric (208).
[0002]
2. Process according to claim 1, CHARACTERIZED by the fact that the at least vinyl alcohol polymer (202) is a vinyl alcohol copolymer.
[0003]
Process according to claim 2, CHARACTERIZED by the fact that the at least one vinyl alcohol polymer (202) comprises a vinyl alcohol copolymer containing acetic ester group.
[0004]
4. Process according to claim 3, CHARACTERIZED by the fact that the vinyl alcohol copolymer containing acetic ester group comprises units of vinyl alcohol, and units of an acetic ester group having a structure represented by the structure (1):
[0005]
5. Process according to claim 3 or 4, CHARACTERIZED by the fact that the vinyl alcohol copolymer containing acetic ester group comprises vinyl alcohol units having a 1,2-diol structure represented by the structure (2) :
[0006]
6. Process according to any one of claims 3 to 5, CHARACTERIZED by the fact that the vinyl alcohol copolymer containing acetic ester group comprises units having a structure represented by the structure (3):
[0007]
Process according to any one of claims 1 to 6, CHARACTERIZED by the fact that the at least one vinyl alcohol polymer (202) comprises a vinyl alcohol copolymer that has been partially acetalized.
[0008]
8. Process according to claim 7, CHARACTERIZED by the fact that the vinyl alcohol copolymer that has been partially acetalized comprises vinyl alcohol units having a 1,2-diol structure represented by the structure (2):
[0009]
Process according to any one of claims 1 to 8, CHARACTERIZED by the fact that the at least one vinyl alcohol polymer (202) comprises vinyl alcohol units having a 1,2-diol structure represented by the structure (2 ):
[0010]
10. Process according to claim 9, CHARACTERIZED by the fact that the vinyl alcohol units having a 1,2-diol structure comprise vinyl alcohol units having a 1,2-diol structure represented by the structure (4) :
[0011]
11. Process according to any one of claims 1 to 10, CHARACTERIZED by the fact that the at least one vinyl alcohol polymer (202) is soluble in water.
[0012]
Process according to any one of claims 1 to 11, CHARACTERIZED in that the step of placing the polymerizable composition (206) in one of the first mold member (204) or the second mold member (204) comprises placing a polymerizable composition (206) comprising at least one silicone monomer, silicone macromer, silicone prepolymer, or combination thereof, and at least one hydrophilic monomer in the first mold member (204), and wherein the body ophthalmic lens comprises a silicone hydrogel contact lens body.
[0013]
13. Process according to any one of claims 1 to 12, CHARACTERIZED by the fact that the step of using at least one vinyl alcohol polymer (202) to form at least one of the first mold member (204) and the second mold member (204) comprises injection molding of at least one of the first mold member (204) and the second mold member (204).
[0014]
14. Process according to claim 13, CHARACTERIZED by the fact that the injection molding process of the vinyl alcohol polymer (202) to form at least one of the first mold member (204) and the second mold member (204) comprises using a process setting selected from the group consisting of: melting temperature from 180 ° C to 250 ° C, cylinder temperature from 180 ° C to 250 ° C, throat temperature from 30 ° C to 70 ° C, mold tool temperature from 30 ° C to 95 ° C, holding time from 1 second to 5 seconds, injection speed from 50 mm / second to 250 mm / second, plasticizing speed from 100 mm / second to 300 mm / second, injection pressure from 5 x 106 Pa (50 bar) to 1.8 x 107 Pa (180 bar), holding pressure from 1 x 106 Pa (10 bar) to 2 x 107 Pa (200 bar), against pressure from 5 x 105 Pa (5 bar) to 2.5 x 106 Pa (25 bar), and any combination thereof.
[0015]
15. Silicone hydrogel contact lens body prepared following the process steps, as defined in claim 1, CHARACTERIZED by the fact that the contact lens body comprises: a melted molded silicone hydrogel lens body (208 ) comprising the reaction product of a polymerizable composition (206), the polymerizable composition (206) comprising at least one silicone monomer and at least one hydrophilic monomer; wherein the lens body is melt-molded into a mold assembly comprising a first mold member (204) and a second mold member (204), at least one of the first mold member (204) and the second mold member mold (204) comprising at least one highly amorphous vinyl alcohol polymer (202) having an average level of crystallinity of less than 35%.
[0016]
16. Silicone hydrogel contact lens body, according to claim 15, CHARACTERIZED by the fact that at least one vinyl alcohol polymer (202) is a vinyl alcohol copolymer.
[0017]
17. Mold member (204) used in the process, as defined in claim 1, for melting molding of an ophthalmic device body, CHARACTERIZED by the fact that it comprises: a mold member (204) comprising a molding surface (204) and a non-molding region, wherein at least the molding surface (204) of the mold member (204) comprises at least one highly amorphous vinyl alcohol polymer (202) having an average level of crystallinity less than 35%.
[0018]
18. Mold member according to claim 17, CHARACTERIZED by the fact that the at least one vinyl alcohol polymer (202) is a vinyl alcohol copolymer.
[0019]
19. Mold member according to claim 18, CHARACTERIZED by the fact that the at least one vinyl alcohol polymer (204) comprises a vinyl alcohol copolymer containing acetic ester group, or a vinyl alcohol copolymer that has been partially acetalized, or a vinyl alcohol copolymer comprising vinyl alcohol units having a 1,2-diol structure, or any combination thereof.

类似技术:

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公开号 | 公开日 | 专利标题

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BR112013002366B1|2021-01-05|process for manufacturing an ophthalmic device, silicone hydrogel contact lens body and mold member for melting molding of an ophthalmic device body

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法律状态:
2018-04-10| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-08-06| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-05-12| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2020-11-10| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-01-05| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 13/06/2011, OBSERVADAS AS CONDICOES LEGAIS. |

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2021-08-24| B25G| Requested change of headquarter approved|Owner name: COOPERVISION INTERNATIONAL HOLDING COMPANY, LP (BB) |

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2021-09-14| B25A| Requested transfer of rights approved|Owner name: COOPERVISION INTERNATIONAL HOLDING COMPANY, LP (BB) |

优先权:

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申请号 | 申请日 | 专利标题

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US36911610P| true| 2010-07-30|2010-07-30|

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US61/369,116|2010-07-30|

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PCT/GB2011/051099|WO2012013944A1|2010-07-30|2011-06-13|Ophthalmic device molds formed from highly amorphous vinyl alcohol polymer, ophthalmic devices molded therein, and related methods|

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