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    • 专利摘要:
    elastic film, absorbent article and method for forming an elastic film the present invention provides a film containing a thermoplastic composition which has a substantial portion of a renewable natural starch polymer and which is additionally elastic and has good strength properties. although starch is normally chemically incompatible with most elastomeric polymers due to different polarities, the present inventors have found that phase separation can be minimized by selectively controlling certain aspects of the film, such as the nature of the elastomeric polymer and the starch polymer, and other film components, the relative quantity of the film components and the process for making the film.
    公开号:BR112013014228B1
    申请号:R112013014228-6
    申请日:2011-10-31
    公开日:2020-03-10
    发明作者:James H. Wang；Bo Shi
    申请人:Kimberly-Clark Worldwide, Inc.；
    IPC主号:
    专利说明:

    ELASTIC FILM, ABSORBENT ARTICLE AND METHOD FOR FORMING AN ELASTIC FILM
    HISTORY OF THE INVENTION
    Films are used in a wide variety of disposable products, such as diapers, sanitary napkins, adult incontinence garments, bandages, etc. For example, many diapers employ a backsheet that is formed from a plastic film (for example, linear low density polyethylene) laminated to a nonwoven web. In some cases, the plastic film may contain an elastomeric component, such as a styrenic block copolymer (for example, styrene-ethylene-butylene-styrene (S-EBS) copolymers). However, a problem with such films is that the polymers are generally not environmentally compatible or renewable. In addition, due to the fact that many renewable components are very rigid in nature, their use in elastic films has been limited due to the need to maintain a high level of elongation, deformation recovery and strength properties. As such, there is currently a demand for an improved film, which is elastic and contains a renewable component.
    SUMMARY OF THE INVENTION
    According to an embodiment of the present invention, an elastic film is described which comprises a thermoplastic composition comprising at least one starch polymer which constitutes from about 1% by weight to about 30% by weight of the polymer content of the film and at least at least one elastomeric polymer that constitutes from about 30% by weight to about 95% by weight of the polymer content of the film, and at least one plasticizer that constitutes from about 0.1% by weight to about 30 % by weight of the film. The weight ratio of elastomeric polymers to starch polymers in the film is about 1 to about 10. The elastic film also exhibits an elongation in the machine direction and in the machine transverse direction of about 250% or more.
    Other features and aspects of the present invention are discussed in more detail below.
    2/39
    BRIEF DESCRIPTION OF THE DRAWINGS
    A complete and enabling description of the present invention, including its best mode, directed to a person skilled in the art, is described more particularly in the rest of the specification, which makes reference to the attached figures, in which:
    THE Figure 1 is a schematic illustration of a modality of one method for forming a film according to the the present invention; and THE Figure 2 is a perspective view of a absorbent article that can be formed according to a
    embodiment of the present invention.
    0 repeated use of reference characters in the this report descriptive and drawings is intended to represent characteristics or analogous or similar elements of the invention.
    DETAILED DESCRIPTION OF REPRESENTATIVE MODALITIES
    Definitions
    As used in the present invention, the terms machine direction or MD generally refer to the direction in which a material is produced. The term cross-machine direction or CD refers to the direction perpendicular to the machine direction. Dimensions measured in the direction transverse to the machine are referred to as the width dimension, while dimensions measured in the machine direction are referred to as length dimensions.
    As used in the present invention, the term elastomeric and elastic refers to a material that, after applying a stretching force, is stretchable in at least one direction (such as the CD direction) and that after releasing the stretching force , contracts / returns to approximately its original dimension. For example, a stretched material may have a stretched length that is at least 50% greater than its relaxed unstretched length, and which will recover to at least 50% of its stretched length after releasing the stretching force. A hypothetical example would be a 2.54 cm (one (1) inch) sample of material that is stretchable up to
    3/39
    3.81 cm (1.50 inch) is that, after the release of the drawing force, it will recover to a length of at least 3.18 cm (1.25 inch). Desirably, the material contracts or recovers at least 50%, and even more desirably, at least 80% of the stretched length.
    As used in the present invention, the terms extensible or extensibility generally refer to a material that stretches or extends in the direction of an applied force for at least about 50% of its relaxed length or width. An extensible material does not necessarily have the recovery properties. For example, an elastomeric material is an extensible material with recovery properties. A film may be extensible, but it has no recovery properties, and therefore, it is a non-elastic extensible material.
    As used in the present invention, the term percent stretch refers to the degree to which a material extends in a given direction, when subjected to a given force. In particular, the percentage stretch is determined by measuring the increase in material length in the stretched dimension, dividing that value by the original dimension of the material and then multiplying by 100.
    As used in the present invention, the term fit refers to the elongation retained in a sample of material after elongation and recovery, that is, after the material has been stretched and allowed to relax during a cycle test.
    As used in the present invention, the term percentage adjustment is a measure of the amount of material drawn from its original length after being stretched and relaxed. The deformation remaining after removing the applied stress is measured as the percent adjustment.
    Detailed Description
    Reference will now be made in detail to various embodiments of the invention, with one or more examples of which are described below. Each example is provided by way of explanation of the invention, and not by way of limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without
    4/39 depart from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment can be used in another embodiment to further produce an additional embodiment. Thus, the present invention is intended to cover such modifications and variations as being within the scope of the appended claims and their equivalents.
    Generally speaking, the present invention is directed to a film that contains a thermoplastic composition that has a substantial portion of a renewable natural starch polymer, yet is elastic and exhibits good strength properties. Although starch is normally chemically incompatible with most elastomeric polymers due to different polarities, the present inventors have found that phase separation can be minimized by selectively controlling certain aspects of the film, such as the nature of the elastomeric polymer and the starch polymer, and other film components, the relative quantity of the film components and the process for making the film.
    Various embodiments of the present invention will now be described in greater detail below.
    I. Thermoplastic Composition
    A. Elastomeric Polymer
    Any of a variety of different elastomeric polymers can be employed in the film of the present invention, such as elastomeric polyesters, elastomeric polyurethanes, elastomeric polyamides, elastomeric copolymers and so on. In one embodiment, for example, an olefinic elastomer is used which is a polyolefin capable of exhibiting a substantially regular structure (semicrystalline). Such olefin elastomers can be substantially amorphous in their undeformed states, but form crystalline domains after stretching. The degree of crystallinity of the olefin polymer can be from about 3% to about 30%, in some embodiments, from about 5% to about 25%, and in some embodiments, from about 5% to about 15% %. Likewise, the olefin elastomer may have a latent heat of fusion (AH f ), which is another indicator of the degree of
    5/39 crystallinity, from about 15 to about 75 Joules per gram (J / g), in some modalities, from about 20 to about 65 J / g, in some modalities, from 25 to about 50 J / g g. The olefinic elastomer can also have a Vicat softening temperature of about 10 ° C to about 100 ° C, in some embodiments, from about 20 ° C to about 80 ° C, and in some embodiments, about 30 ° C to about 60 ° C. The olefinic elastomer can have a melting temperature of about 20 ° C to about 120 ° C, in some embodiments, from about 35 ° C to about 90 ° C, and in some embodiments, about 40 ° C at about 80 ° C. The latent heat of fusion (ΔΗί) and the melting temperature can be determined using differential scanning calorimetry (DSC) according to ASTM D-3417, as is well known to those skilled in the art. The Vicat softening temperature can be determined according to ASTM D-1525.
    Exemplary semi-crystalline olefinic elastomers include polyethylene, polypropylene, combinations and copolymers thereof. In a particular embodiment, a polyethylene is employed that is a copolymer of ethylene and an α-olefin, such as C 3 -C 2 otolefina the α-olefin or C 2 -C 3. Suitable α-olefins can be linear or branched (for example, one or more C x -C 3 alkyl branches, or an aryl group). Specific examples include 1butene; 3-methyl-1-butene; 3,3-dimethyl-1-butene; 1-pentene; 1-
    pentene with one or more substituents methyl. ethyl or propyl; 1- hexene with one or more substituents methyl, ethyl or propyl; 1- heptene with one or more substituents methyl, ethyl or propyl; 1- octene with one or more substituents methyl, ethyl or propyl; 1- noneno with one or more substituents methyl, ethyl or propyl; 1-
    decene replaced with ethyl, methyl or dimethyl; 1-dodecene; and styrene. Particularly desirable, olefin comonomers are 1-butene, 1-hexene and 1-octene. The ethylene content of such copolymers can be from about 60 mol% to about 99 mol%, in some embodiments, from about 80 mol% to about 98.5 mol% and, in some embodiments, from about 87 mol% to about 97.5 mol%. The content of o-olefin may likewise vary from about 1 mol% to about 40 mol%, in some embodiments, from about 1.5 mol% to about 15 mol% and, in
    6/39 some embodiments, from about 2.5 mol% to about 13 mol%. Propylene polymers may also be suitable for use as an olefinic elastomer. In a particular embodiment, the semicrystalline propylene-based polymer includes a propylene copolymer and an α-olefin, such as a C 2 -C 2 o α-olefin or C 2 -C 12 oolefin. Particularly desirable α-olefin comonomers are ethylene, 1-butene, 1-hexene and 1-octene. The propylene content of such copolymers can be from about 60 mol% to about 99.5 mol%, in some embodiments, from about 80 mol% to about 99 mol% and, in some embodiments, from about 85 mol% to about 98 mol%. The α-olefin content can likewise vary from about 0.5 mol% to about 40 mol%, in some embodiments, from about 1 mol% to about 20 mol% and, in some embodiments, from about 2 mol% to about 15 mol%.
    Any of several known techniques can generally be employed to form the olefinic elastomers. For example, olefin polymers can be formed using a free radical or a coordinating catalyst (for example, Ziegler-Natta). Preferably, the olefin polymer is formed from a single site coordination catalyst, such as a metallocene catalyst. Such a catalyst system produces ethylene copolymers, in which the comonomer is randomly distributed within a molecular chain and uniformly distributed among different molecular weight fractions. Metallocene-catalyzed polyolefins are described, for example, in U.S. Patent Nos. 5,571,619, to McAlpin et al .; 5,322,728, for Davis et al .: 5,472,775, for Obijeski et al .; 5,272.23 6, for Lai et al .: and 6,090,325, for Wheat et al. , which are incorporated in this document in their entirety by reference to them for all purposes. Examples of metallocene catalysts include bis (nbutylcyclopentadienyl) titanium dichloride, bis (nbutylcyclopentadienyl) zirconium dichloride, scandium bis (cyclopentadienyl) chloride, bis (indenyl) zirconium dichloride, bis (methyl dichloro) dichloride methylcyclopentadienyl) zirconium, cobaltocene, cyclopentadienyltitanium trichloride, ferrocene, hafnocene dichloride,
    7/39 isopropyl dichloride (cyclopentadienyl, -1-fluorenyl) zirconium, molybdocene dichloride, nickelocene, niobocene dichloride, rutenocene, titanocene dichloride, zirconocene hydride, zirconene dichloride and similar. Polymers made using metallocene catalysts generally have a limited molecular weight range. For example, metallocene-catalyzed polymers may have polydispersity numbers (M w / M n ) less than 4, controlled short chain branch distribution and controlled isotacticity.
    The density of such α-olefin copolymers is a function of the length and amount of α-olefin. That is, the greater the length of α-olefin and the greater the amount of otolefin present, the lower the density of the copolymer. Although not necessarily necessary, substantially linear elastomers are particularly desirable because the short chain branching content of α-olefin is such that the copolymer has both plastic and elastomeric characteristics. Due to the fact that polymerization with α-olefin comonomers decreases crystallinity and density, the resulting elastomer usually has a lower density than that of polyethylene thermoplastic polymers (eg LLDPE), but approaches and / or overlaps the other elastomers. For example, the density of olefinic elastomers can be about 0.91 grams per cubic centimeter (g / cm 3 ) or less, in some embodiments, from about 0.85 to about 0.89 g / cm 3 and , in some embodiments, from about 0.85 g / cm 3 to about 0.88 g / cm 3 .
    Preferred ethylene elastomers for use in the present invention are ethylene-based copolymer plastomers available under the brand name EXACT ™ available from ExxonMobil Chemical Company, Houston, Texas. Other suitable polyethylene plastomers are available under the designation ENGAGE ™ and AFFINITY ™, from the Dow Chemical Company, Midland, Michigan, USA. Still other suitable ethylene polymers are available from the Dow Chemical Company under the designations DOWLEX ™ (LLDPE) and ATTANE ™ (ULDPE). Such ethylene polymers are described in U.S. Patent Nos. 4,937,299, to Ewen et al. ; 5,218,071, for
    8/39
    Tsutsui et al .: 5,272,236, for Lai, et al .; and 5,278,272, to Lai, et al., which are incorporated in this document in their entirety by reference to them for all purposes. Suitable propylene polymers are available commercially under the designations VISTAMAXX ™, from ExxonMobil Chemical Co. of Houston, Texas, USA; FINA ™ (eg 8573) available from Atofina Chemicals of Feluy, Belgium; TAFMER ™, available from Mitsui Petrochemical Industries; and VERSIFY ™, available from Dow Chemical Co. of Midland, Michigan, USA. Other examples of suitable propylene polymers are described in U.S. Patent Nos. 6,500,563, for Datta. et al .: 5,539,056, for Yang, et al. ; and 5,596,052, to Resconi, et al. , which are incorporated in this document in their entirety by reference to them for all purposes.
    The melt flow index (MI) of olefinic elastomers can generally vary, but is typically in the range of about 0.1 gram for 10 minutes to about 100 grams for 10 minutes, in some embodiments, from about 0, 5 grams for 10 minutes to about 30 grams for 10 minutes and, in some embodiments, from about 1 to about 10 grams for 10 minutes, determined at 190 ° C. The melt flow index is the weight of the polymer (in grams) that can be forced through an extrusion rheometer hole (0.2096 cm (0.0825 inch) in diameter) when subjected to a force of 2.16 kilograms in 10 minutes at 190 ° C, and can be determined according to the ASTM Test Method D1238-E.
    Of course, other olefinic elastomers can also be used in the present invention. In one embodiment, for example, the thermoplastic elastomer can be a styrene-olefin block copolymer, such as styrene- (ethylene-butylene), styrene- (ethylene-propylene), styrene- (ethylene-butylene) styrene, styrene- ( ethylene-propylene) -styrene, styrene (ethylene-butylene) -styrene- (ethylene-butylene), styrene- (ethylenepropylene) -styrene- (ethylene-propylene) and styrene-ethylene (ethylene-propylene) -styrene Such polymers can be formed by selective hydrogenation of styrenediene block copolymers, as described in U.S. Patent Nos. 4,663,220, 4,323,534,
    9/39
    4,834,738, 5,093,422 and 5,304,599, which are incorporated in this document in their entirety by reference to them for all purposes. Particularly suitable thermoplastic elastomers are available from Kraton Polymers LLC of Houston, Texas, USA, under the trade name KRATON®. Other commercially available block copolymers include SEP-S elastomeric copolymers, available from Kuraray Company, Ltd. of Okayama, Japan, under the trade name SEPTON®. Also suitable are polymers composed of a ABAB tetrabloc copolymer, as discussed in US Patent No. 5,332,613, to Taylor, et al., Which is incorporated herein in its entirety by reference to it, for all purposes . An example of such a tetrablock copolymer is a styrene-poly (ethylenepropylene) -styrene-poly (ethylene-propylene) block copolymer (S-EP-S-EP).
    As mentioned, thermoplastic polyurethanes can also be employed in the present invention, alone or in combination with another type of elastomer (e.g., olefinic elastomer). Thermoplastic polyurethanes are generally synthesized from a polyol, organic diisocyanate and, optionally, from a chain extender. The synthesis of such fused processable polyurethane elastomers can proceed in a step reaction (eg, prepolymer dispensing process) or simultaneous reaction of all components in a single stage (eg, one-time dispensing process (one- shot)), as is known in the art and described in more detail in US Patent Nos. 3,963,656, to Meisert, et al; 5,605,961, to Lee, et al .; 6,008,276, to Kalbe, et al .; 6,417,313, to Kirchmever, et al. ; and 7,045,650, to Lawrey, et al. , as well as U.S. Patent Application Publications Nos. 2006/0135728, for Peerlings. et al. and 2007/0049719, for Brauer, et al., which are incorporated in this document in their entirety by reference to them for all purposes.
    A polyol is generally any high molecular weight product that has an active hydrogen component that can react and includes materials with an average of about two or more hydroxyl groups per molecule. Long chain polyols can be used that include higher polymeric polyols, such as
    10/39 polyester polyols are polyether polyols, as well as other acceptable polyol reagents, which have an active hydrogen component such as polyester polyols, polyhydroxy polyester amides, hydroxyl-containing polycaprolactones, hydroxyl-containing acrylic interpolymers, hydroxyl-containing epoxies and hydrophobic polyalkylene ether polyols. Typically, the polyol is substantially linear and has two to three, and more preferably two hydroxyl groups, and an average numerical molecular weight of about 450 to about 10,000, in some embodiments, from about 450 to about 6,000 and, in some modalities, from about 600 to about 4,500. Suitable polyethiols can be produced, for example, by reacting one or more alkylene oxides having 2 to 4 carbon atoms in the alkylene residue with an initial molecule that contains two or more active hydrogen atoms attached. Exemplary alkylene oxides include ethylene oxide, 1,2propylene oxide, epichlorohydrin, 1,2-butylene oxide and 2,3-butylene oxide. Exemplary initial molecules include water; aminoalcohols, such as N-alkyldiethanolamines (for example, Nmethyldiethanolamine); and diols, such as ethylene glycol, 1,3propylene glycol, 1,4-butanediol and 1,6-hexanediol.
    Suitable polyesterdiols can be produced from dicarboxylic acids (or their derivatives), with 2 to 12 carbon atoms, preferably from 4 to 6 carbon atoms, and polyhydric alcohols. Exemplary dicarboxylic acids include aliphatic dicarboxylic acids, such as succinic acid, glutaric acid and adipic acid, submeric acid, azelaic acid and sebacic acid, · aromatic dicarboxylic acids, such as phthalic acid, isophthalic acid and terephthalic acid, - as well as derivatives of such acids, such as carboxylic acid diesters having 1 to 4 carbon atoms in the alcohol residue, carboxylic anhydrides or carboxylic acid chlorides. Examples of suitable polyhydric alcohols include glycols having 2 to 10, preferably 2 to 6 carbon atoms, such as ethylene glycol, diethylene glycol, 1,4-butanediol, 1,5-pentanediol,
    1,6-hexanediol, 1,10-decanediol, 2,2-dimethyl-1,3-propanediol, 1,3propanediol and dipropylene glycol. Carbonic acid esters with
    11/39 cited diols are also suitable and, particularly, those having 4 to 6 carbon atoms, such as 1,4-butanediol or 1,6hexanediol, - condensation products of ω-hydroxycarboxylic acids, such as ω-hydroxycaproic acid or lactone polymerization products (for example, optionally substituted ωcaprolactones). Preferred polyesterdiols include ethanediol polyadipates, 1,4butanediol polyadipates, ethanediol / 1,4-butanediol polyadipates, 1,6-hexanediol / neopentyldiglycol polyadipates, 1,6hexanediol / 1,4-butanediol polyadipates and polycaprolactones.
    Organic diisocyanates can include aliphatic diisocyanates, such as ethylene diisocyanate, 1,4-tetramethylene diisocyanate, 1,12-dodecane diisocyanate, 1,6-hexamethylene diisocyanate, mixtures thereof, etc.; cycloaliphatic diisocyanates, such as isophorone diisocyanate, 1,4-cyclohexane diisocyanate, 1-methyl-2,4cyclohexane diisocyanate, l-methyl-2,6-cycloisocyanate -hexane, 4,4 ', 2,4' or 2,2'-dicyclohexylmethane diisocyanate, mixtures thereof, etc .; and / or aromatic diisocyanates, such as 2,4 or 2,6-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 2,2-diisocyanate 1- diphenylmethane, naphthylene-1,5-diisocyanate, xylylene diisocyanate, methylenediphenyl isocyanate (MDI), hexamethylene diisocyanate (HMDI), mixtures thereof, etc.
    Chain extenders typically have an average numerical molecular weight of about 60 to about 400 and contain amino, thiol, carboxyl and / or hydroxyl functional groups. Preferred chain extenders are those having two to three and, more preferably, two hydroxyl groups. As mentioned above, one or more compounds selected from aliphatic diols containing 2 to 14 carbon atoms can be used as a chain extender. Such compounds include, for example, ethanediol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 2,3-butanediol, 1,5-pentanediol, 1,6-hexanediol, diethylene glycol, dipropylene glycol, 1,4 -cyclohexanediol, 1,4dimethanolcyclohexane and neopentylglycol. Diesters of terephthalic acid with glycols having 2 to 4 carbon atoms as well
    12/39 can be employed. Some examples of such compounds include terephthalic acid bis-ethylene glycol and terephthalic acid bis-1,4-butanediol, hydroquinone hydroxyalkylene ethers (eg 1-4-di (β-hydroxyethyl) hydroquinone), ethoxylated bisphenols (by example, 1,4-di (β-hydroxyethyl) bisphenol A), aliphatic (cyclo) diamines (eg, isophoronediamine, ethylenediamine, 1,2-propylenediamine 1,3-propylenediamine, N-methyl-1,3propylenediamine and N, N'-dimethylethylenediamine) and aromatic diamines (eg 2,4-toluenediamine, 2,6-toluenediamine, 3,5-diethyl-2,4-toluenediamine and 3,5-diethyl-2,6-toluenediamine and 4, 4'-diaminodiphenylmethanes (substituted mono, di, tri or tetaalkyls).
    In addition to those noted above, other components can also be used to form the thermoplastic polyurethane. Catalysts, for example, can be used to facilitate the formation of polyurethane. Suitable catalysts include, for example, tertiary amines, such as triethylamine, dimethylcyclohexylamine, N-methylmorpholine, N, N 1 -dimethylpiperazine, 2- (dimethylaminoethoxy) -ethanol, diazabicyclo [2.2.2] octane, etc. as well as metal compounds, such as titanic acid esters, tin diacetate, tin dioctoate, tin dilaurate or the dialkyl tin salts of aliphatic carboxylic acids, such as dibutyltin diacetate or dibutyltin dilaurate or other similar compounds. Still other suitable additives that can be employed include light stabilizers (for example, hindered amines), chain terminators, sliding agents and mold release agents (for example, fatty acid esters, metal soaps, fatty acid amides , fatty acid ester amides and silicone compounds), plasticizers, anti-blocking agents, inhibitors, stabilizers against hydrolysis, heat and discoloration, dyes, pigments, inorganic and / or organic fillers, active substances against fungi and bacteriostats, fillers, etc.
    Thermoplastic polyurethane typically has a melting point of about 75 ° C to about 250 ° C, in some embodiments, from about 100 ° C to about 240 ° C, and in some
    13/39 modalities, from about 120 ° C to about 220 ° C. The glass transition temperature (T g ) of the thermoplastic polyurethane can be relatively low, such as from about -150 ° C to about 0 ° C, in some embodiments, from about -100 ° C to about -10 ° C and, in some embodiments, from about -85 ° C to about -20 and C. The melting temperature and the glass transition temperature can be determined using differential scanning calorimetry (DSC) according to ASTM D-3417 . Examples of such thermoplastic polyurethanes are available under the designation DESMOPAN ™ from Bayer Materialscience and under the designation ESTANE ™ from Lubrizol. DESMOPAN ™ DP 9370A, for example, is a polyurethane based on aromatic polyether formed by (poly) tetramethylene ethylene glycol and 4,4-methylene- (phenylisocyanate) (MDI) and has a glass transition temperature of around -70 ° C and a melting temperature of about 188 ° C to about 199 ° C. ESTANE ™ 58245 is likewise a polyurethane based on aromatic polyether that has a glass transition temperature of -37 ° C and a melting temperature of about 135 ° C to about 159 ° C.
    B. Starch polymer
    Although starch polymers are produced in many plants, typical sources include cereal grain seeds, such as corn, waxy corn, wheat, sorghum, rice and waxy rice; tubers, such as potatoes; roots, such as tapioca (ie cassava (cassava) and cassava (manioc)), sweet potatoes and arrowroot; and the sap of the sago palm. The starch polymer may contain different percentages by weight of amylose and amylopectin, different polymer molecular weights, etc. High amylose starches contain more than about 50% amylose by weight and low amylose starches contain less than about 50% amylose by weight. Although not necessary, low amylose starches with an amylose content of about 10% to about 40% by weight, and in some embodiments, from about 5% to about 35% by weight, are particularly suitable for use in the present invention. Examples of such low amylose starches include corn starch and potato starch, both having an amylose content of about 20% by weight. Particularly suitable low amylose starches are those that have a
    14/39 molecular numerical average (Μη) ranging from about 50,000 to about 1,000,000 grams per mol, in some modalities, from about 75,000 to about 800,000 grams per mol and, in some modalities, from about 100,000 to about 600,000 grams per mole, and / or an average weight molecular weight (Mw) ranging from about 5,000,000 to about 25,000,000 grams per mole, in some embodiments, from about 5,500,000 to about 15,000,000 grams per mol and, in some embodiments, from about 6,000,000 to about 12,000,000 grams per mol. The ratio of the average weight molecular weight to the average numerical molecular weight (Mw / Mn), that is, the polydispersity index, is also relatively high. For example, the polydispersity index can vary from about 10 to about 100 and, in some embodiments, from about 20 to about 80. The average numerical and weight molecular weights can be determined by methods known to those skilled in the art .
    Although native starches are typically desired because they are more natural, chemically modified starches can also be used in the present invention. Chemically modified starches can be obtained by means of typical processes known in the art (for example, esterification, etherification, oxidation, acid hydrolysis, enzymatic hydrolysis, etc.). Starch ethers and / or esters may be particularly desirable, such as hydroxyalkylamides, carboxymethylamides, etc. The hydroxyalkyl group of hydroxyalkylamides may contain, for example, from 2 to 10 carbon atoms, in some embodiments, from 2 to 6 carbon atoms and, in some embodiments, from 2 to 4 carbon atoms. Representative hydroxyalkylamides are, for example, hydroxyethylamide, hydroxypropylamide, hydroxybutylamide and their derivatives. Starch esters, for example, can be prepared using a wide variety of anhydrides (eg, acetic, propionic, butyric acid and so on), organic acids, acid chlorides or other esterifying reagents. The degree of esterification can vary as desired, such as from 1 to 3 ester groups per glycosidic unit of the starch.
    15/39
    Regardless of the particular polymers employed, the relative amount of starch polymers employed in the film is generally high enough to achieve a certain degree of renewability, but not so high that good elongation properties are not achieved. In this regard, starch polymers typically comprise from about 1% by weight to about 30% by weight, in some embodiments, from about 2% by weight to about 25% by weight and, in some embodiments, by about 5% by weight to about 20% by weight of the polymer content of the film. Within these ranges, the present inventors have found that excellent elongation properties can be achieved by using a relatively high amount of the renewable component. In addition, although the percentage of the entire film made up of starch polymers may vary, depending on the other ingredients used (for example, carags), they typically comprise from about 0.5% by weight to about 50% by weight , in some embodiments, from about 1% by weight to about 40% by weight and, in some embodiments, from about 5% by weight to about 25% by weight of the entire film. It should be understood that the weight of the starch mentioned in this document includes any naturally occurring bound water in the starch before mixing it with other components to form the thermoplastic starch. Starches, for example, generally have a bound water content of about 5% to 16% by weight of starch.
    To achieve the desired balance between renewability and elongation, the weight ratio of elastomeric polymers to starch polymers is also usually about 1 to about 10, in some embodiments, about 2 to about 8 and, in some embodiments, from about 3 to about 6. For example, elastomeric polymers can comprise from about 30% by weight to about 95% by weight, in some embodiments, from about 40% by weight to about from 90% by weight and, in some embodiments, from about 50% by weight to about 80% by weight of the polymer content of the film. In addition, although the percentage of the entire film made up of elastomeric polymers may vary depending on the other ingredients employed (eg fillers), they typically
    16/39 about 10% by weight to about 90% by weight, in some embodiments, from about 20% by weight to about 80% by weight and, in some embodiments, from about 40% by weight to about 75% by weight of the entire film.
    C. Plasticizer
    A plasticizer is also used in the film to help make the processable starch melt. Starches, for example, usually exist in the form of granules that have an outer coating or membrane that encapsulates the most water-soluble amylose and amylopectin chains within the granule. When heated, plasticizers can soften and penetrate the outer membrane and cause the internal starch chains to absorb water and swell. This swelling, at some point, will cause the outer shell to break and result in an irreversible breakdown of the starch granule. Once unstructured, the starch polymer chains containing amylose and amylopectin polymers, which are initially compressed within the granules, will stretch and form a generally disordered entanglement of the polymer chains. After resolidification, however, the chains can reorient themselves to form crystalline or amorphous solids with different strengths, depending on the orientation of the starch polymer chains. Because starch is therefore able to melt and re-solidify at certain temperatures, it is generally considered to be a thermoplastic starch.
    Suitable plasticizers may include, for example, polyhydric alcohol plasticizers, such as sugars (eg, glucose, sucrose, fructose, raffinose, maltodextrose, galactose, xylose, maltose, lactose, mannose and erythrose), sugar alcohols erythritol, xylitol, malitol, mannitol and sorbitol), polyols, (eg ethylene glycol, glycerol, propylene glycol, dipropylene glycol, butylene glycol and hexanotriol), etc. Also suitable are hydrogen bonding organic compounds that have no hydroxyl group, including urea and urea derivatives; anhydrides of sugar alcohols such as sorbitan; animal proteins such as gelatin; vegetable proteins like sunflower protein, soy protein, protein
    17/39 cotton seed; and their mixtures. Other suitable plasticizers can include phthalate, dimethyl and diethylsuccinate esters and related esters, glycerol triacetate, glycerol mono and diacetates, glycerol mono, di and tripropionates, butanoates, stearates, lactic acid esters, citric acid esters, esters adipic acid, esters of stearic acid, esters of oleic acid and other esters of acids. Aliphatic acids can also be used, such as copolymers of ethylene and acrylic acid, polyethylene grafted with maleic acid, polybutadiene-coacrylic acid, polybutadiene-comaleic acid, polypropylene-coacrylic acid, polypropylene-comaleic acid and other hydrocarbon-based acids. A low molecular weight plasticizer is preferred, such as less than about 20,000 g / mol, preferably less than about 5,000 g / mol and, more preferably, less than about 1,000 g / mol.
    If desired, the plasticizer can be pre-combined with the starch polymer to form a thermoplastic starch. In such embodiments, the starch polymers may comprise from about 40% by weight to about 98% by weight, in some embodiments, from about 50% by weight to about 95% by weight, and in some embodiments, by about 60% by weight to about 90% by weight of the thermoplastic starch. Likewise, the plasticizer typically constitutes from about 2% by weight to about 60% by weight, in some embodiments, from about 5% by weight to about 50% by weight and, in some embodiments, from about 10% by weight to about 40% by weight of the thermoplastic starch. Regardless of being pre-combined with the starch polymer, or simply combined with it during film formation, plasticizers typically comprise from about 0.1% by weight to about 30% by weight, in some embodiments, from around from 0.5% by weight to about 20% by weight and, in some embodiments, from about 1% by weight to about 10% by weight of the film.
    D. Other Components
    In addition to those noted above, still other additives can also be incorporated into the thermoplastic starch or throughout the film. For example, dispersion aids can be
    18/39 used to create a uniform dispersion of the starch / plasticizer / elastomeric polymer and to delay or prevent separation in constituent phases. When used, the dispersion aid (s) may comprise from about 0.01% by weight to about 10% by weight, in some embodiments, from about 0.05% by weight. weight about 5% by weight and, in some embodiments, from about 0.1% by weight to about 4% by weight of the film.
    Although any dispersion aid can generally be used in the present invention, surfactants with a certain hydrophilic / lipophilic balance can improve the long-term stability of the composition. As is known in the art, the relative hydrophilicity or lipophilicity of an emulsifier can be characterized by the hydrophilic / lipophilic balance scale (HLB), which measures the balance between the hydrophilic and lipophilic solution trends of a compound. The HLB scale ranges from 0.5 to approximately 20, with the smaller numbers representing highly lipophilic trends and the larger numbers representing highly hydrophilic trends. In some embodiments of the present invention, the HLB value of the surfactants is from about 1 to about 15, in some embodiments, from about 1 to about 12 and, in some embodiments, from about 2 to about 10. If desired, two or more surfactants can be used that have HLB values below or above the desired value, but together, they have an average HLB value within the desired range.
    A particularly suitable class of surfactants for use in the present invention are non-ionic surfactants, which typically have a hydrophobic base (for example, long-chain alkyl group or alkylated aryl group) and a hydrophilic chain (for example, chain containing ethoxy and / or propoxy). For example, some suitable non-ionic surfactants that can be used include, but are not limited to, ethoxylated alkylphenols, ethoxylated and propoxylated fatty alcohols, methylglucose polyethylene glycol ethers, sorbitol polyethylene glycol ethers, ethylene oxide block copolymers propylene, ethoxylated fatty acid esters (Cg-Cig), condensation products of ethylene oxide with amines or
    19/39 long chain amides, condensation products of ethylene oxide with alcohols, fatty acid esters, monoglycerides or diglycerides of long chain alcohols, and mixtures thereof. In a particular embodiment, the non-ionic surfactant can be a fatty acid ester, such as a sucrose fatty acid ester, a glycerol fatty acid ester, a propylene glycol fatty acid ester, a sorbitan fatty acid ester , a pentaerythritol fatty acid ester, a sorbitol fatty acid ester, and so on. The fatty acid used to form such esters can be saturated or unsaturated, substituted or unsubstituted, and can contain 6 to 22 carbon atoms, in some embodiments, 8 to 18 carbon atoms and, in some embodiments, 12 to 14 carbon atoms. In a particular embodiment, mono- and diglycerides of fatty acids can be used in the present invention.
    Other components can also be incorporated into the thermoplastic composition used to form the film. For example, the film may contain one or more synthetic biodegradable polyesters. The term biodegradable generally refers to a material that degrades from the action of naturally occurring microorganisms, such as bacteria, fungi and algae; environmental heat; moisture; or other environmental factors, such as determined in accordance with ASTM Test Method 5338.92. Examples of suitable synthetic biodegradable polyesters include aliphatic polyesters, such as polycaprolactone, polyesteramides, modified polyethylene terephthalate, polylactic acid (PLA) and its copolymers, terpolymers based on polylactic acid, polyglycolic acid, polyalkylene carbonates (such as polyethylene carbonate), polyhydroxyalkanoates (PHA), poly-3-hydroxybutyrate (PHB), poly-3-hydroxyvalerate (PHV), copolymers of poly-3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV), poly-3-hydroxybutyrate-co- 3-hydroxy-hexanoate, poly-3-hydroxybutyrate-co-3-hydroxyoctanoate, poly-3-hydroxybutyrate-co-
    3-hydroxydecanoate, poly-3-hydroxybutyrate-co-3hydroxyoctadecanoate and succinate-based aliphatic polymers (for example, polybutylene succinate, polybutylene succinate, polyethylene succinate,
    20/39 etc.), aromatic polyesters and modified aromatic polyesters; and aliphatic-aromatic copolymers. For example, biodegradable polyester can be an aliphatic-aromatic copolyester with the following structure:
    'O O
    O— (CH 2 ) m —O — C (CH 2 ) n —C — Ο— - (0¾— o — C
    THE
    in what, m is one whole number of 2 The 10, in some modalities, in 2 a 4, and in one embodiment, 4; n is one whole number of 0 The 18, in some modalities, in 2 a 4, and in one embodiment, 4; P is one number. whole of 2 The 10, in some modalities, in 2 a 4, and in one embodiment, 4;
    x is an integer greater than 1; y is a whole number greater than 1. An example of such a copolyester is polybutylene adipatotherephthalate, which is commercially available under the designation ECOFLEX® F BX 7011, available from BASF Corp. Another example of a suitable copolyester containing a monomeric constituent of aromatic terephthalic acid is available under the designation ENPOL ™ 8060M, available from IRE Chemicals (South Korea). Other suitable aliphatic-aromatic copolyesters can be described in US Patent Nos. 5,292,783; 5,446,079; 5,559,171; 5,580,911; 5,599,858; 5,817,721; 5,900,322; and 6,258,924, which are incorporated in this document in their entirety by reference to them, for all purposes. 1
    When used, synthetic biodegradable polyesters can comprise from about 5% by weight to about 60% by weight, in some embodiments, from about 10% by weight to about 50% by weight and, in some embodiments, from around from 15% by weight to about 40% by weight of the polymer content of the film. In addition, although the percentage of the entire film made up of biodegradable polyesters may vary, depending on the other ingredients used (for example, fillers), they can generally comprise from about 1% by weight to about 70% by weight some
    21/39 modalities, from about 5% by weight to about 60% by weight and, in some embodiments, from about 10% by weight to about 50% by weight of the entire film.
    In addition to the components noted above, other additives can also be incorporated into the film of the present invention, such as slip additives, melt stabilizers, processing stabilizers, heat stabilizers, light stabilizers, antioxidants, heat aging stabilizers, bleaching, binding agents, fillers, etc. The fillers, for example, are particulates or other forms of material that can be added to the polymer extrusion combination of the film and which will not chemically interfere with the extruded film, but which can be uniformly dispersed throughout the film. The fillers can serve a variety of purposes, including increasing the opacity and / or breathability of the film (i.e., vapor permeable and substantially impermeable to liquids). In addition, hindered phenols are commonly used as an antioxidant in film production. Some suitable hindered phenols include those available from Ciba Specialty Chemicals under the trademark Irganox®, such as Irganox® 1076, 1010 or E 201. In addition, bonding agents can also be added to the film to facilitate bonding of the film to others materials (for example, nonwoven fabrics). Examples of such bonding agents include hydrogenated hydrocarbon resins. Other suitable binding agents are described in U.S. Patent Nos. 4,789,699, to Kieffer et al. and 5,695,868, for McCormack, which are incorporated herein in their entirety by reference to them for all purposes.
    II. Film Construction
    The film of the present invention can be single or multilayer. Multilayer films can be prepared by coextruding the layers, extrusion coating or by any conventional stratification process. Such multilayer films normally contain at least one base layer and at least one film layer, but they can contain any number of layers desired. For example, the film
    Multilayer 22/39 can be formed from a base layer and one or more layers of film, wherein the base layer is formed from a combination of elastomeric polymer and the thermoplastic starch polymer. In most embodiments, the film layers are also formed from the combination, as described above. It should be understood, however, that other polymers can also be used in the film layers.
    Any known technique can be used to form a film from the composite material, including blowing, casting, flat die casting, etc. In a particular embodiment, the film can be formed by a blowing process in which a gas (for example, air) is used to expand a bubble of the extruded polymer combination through an annular mold. The bubble is then broken up and collected in the form of a flat film. Processes for producing blown films are described, for example, in U.S. Patent Nos. 3,354,506, for Raley; 3,650,649, for Schippers; and 3,801,429, to Schrenk et al. , as well as U.S. Patent Application Publications Nos. 2005/0245162, for McCormack, et al. and 2003/0068951, to Boggs, et al. , which are incorporated in this document in their entirety by reference to it for all purposes. In yet another modality, however, the film is formed using a casting technique.
    Referring to Figure 1, for example, one embodiment of a method for forming a molten film is shown. The raw materials (for example, thermoplastic starch polymer, elastomeric polymer, etc.) can be supplied to a melt combination device, either separately or as a combination. In one embodiment, for example, the components are separately supplied to a melt combination device, where they are dispersively combined in a manner as described above. For example, an extruder can be used that includes supply and ventilation ports. In one embodiment, the elastomeric polymer can be fed to a feed port of the cast and twin screw extruder. Thereafter, the thermoplastic starch polymer can be fed into the molten polymer. Regardless,
    23/39 the materials are combined under high shear / pressure and heat to ensure sufficient mixing. For example, the melting combination can occur at a temperature of about 75 ° C to about 400 ° C, in some embodiments, from about 80 ° C to about 300 ° C and, in some embodiments, from about 90 ° C to about 250 ° C. Likewise, the apparent shear rate during the melting combination can range from about 100 seconds -1 to about 10,000 seconds -1 , in some embodiments, from about 500 seconds -1 to about 5,000 seconds -1 and , in some modalities, from about 800 seconds -1 to about 1,200 seconds -1 . The apparent shear rate is 4Q / mR 3 , where Q is the volumetric flow rate (m 3 / s) of the polymer melt and R is the radius (m) of the capillary (for example, extruder mold) through which the molten polymer flows.
    After that, the extruded material can be immediately cooled and cut into a pellet. In the particular embodiment of Figure 1, the composite material (not shown) is then supplied to an extrusion apparatus 80 and is cast on a casting cylinder 90 to form a single layer precursor film 10a. If a multilayer film is produced, the multiple layers are coextruded together over the casting cylinder 90. The casting cylinder 90 can optionally be provided with embossing elements to give a pattern to the film. Typically, the casting cylinder 90 is maintained at a temperature sufficient to solidify and temper sheet 10a as it is formed, for example, such as from about 20 to 60 ° C. If desired, a vacuum box can be positioned adjacent to the casting cylinder 90 to help keep the precursor film 10a close to the surface of the cylinder 90. In addition, any air blades or electrostatic pins can help to force the precursor film 10a against the surface of the casting cylinder 90 as it moves around a spinning cylinder. An air blade is a device known in the art that focuses on an air flow at a very high flow rate to fix the edges of the film.
    Once cast, film 10a can then be optionally oriented in one or more directions to improve
    24/39 further film uniformity and reduce thickness. The orientation can also form micropores in a film that contains a charge, thus providing breathability for the film. For example, the film can be immediately reheated to a temperature below the melting point of one or more polymers in the film, but high enough to allow the composition to be extracted or stretched. In the case of sequential orientation, the softened film is extracted by cylinders that rotate at different speeds of rotation, so that the sheet is stretched to the desired draft ratio in the longitudinal direction (machine direction). This uniaxially oriented film can then be laminated to a fibrous web. In addition, the uniaxially oriented film can also be oriented in the direction transverse to the machine to form a biaxially oriented film. For example, the film can be fixed on its side edges by chain clamps and transported to a tenter oven. In the tenter oven, the film can be reheated and extracted in the transversal direction to the machine to the desired draft ratio by the chain clamps that diverged in their forward movement.
    Referring again to Figure 1, for example, a method of forming a uniaxially oriented film is shown. As illustrated, the precursor film 10a is directed to a film orientation unit 100 or machine direction advisor (MDO), as is commercially available from Marshall and Wiliams, Co. of Providence, Rhode Island, USA. The MDO has a plurality of stretch cylinders (such as 5 to 8) that progressively stretch and thin the film in the machine direction, which is the direction in which the film travels through the process, as shown in Figure 1. Although the MDO 100 is illustrated with eight cylinders, it should be understood that the number of cylinders can be greater or less, depending on the level of stretching that is desired and the degrees of elongation between each cylinder. The film can be drawn in single or multiple discrete drawing operations. It should be noted that some of the cylinders in an MDO device may not work at progressively higher speeds. If desired, some of the
    25/39 cylinders of MDO 100 can act as preheat cylinders. If present, these first few cylinders heat the film 10a above room temperature (for example, to 51.7 2 C (125 2 F)). The progressively faster speeds of the adjacent cylinders in the MDO act to stretch the film 10a. The rate at which the stretch cylinders rotate determines the degree of stretch in the film and the final weight of the film.
    The resulting film 10b can then be folded and stored in a take-up roll 60. Although not shown here, several additional potential processing and / or finishing steps known in the art, such as cutting, treatment, opening , printing graphics or lamination of the film with other layers (for example, non-woven materials), can be carried out without departing from the spirit and scope of the invention.
    The thickness of the resulting elastic film can vary generally depending on the intended use. In most embodiments of the present invention, however, the elastic film has a thickness of about 50 micrometers or less, in some embodiments, from about 1 to about 100 micrometers, in some embodiments, from about 5 to about 75 micrometers and, in some modalities, from 10 to 60 micrometers.
    Despite having such a small thickness, the film of the present invention, however, is able to maintain good dry mechanical properties during use. A parameter that is indicative of the relative dry strength of the film is the final tensile strength, which is equal to the peak stress obtained is a strain-strain curve. Desirably, the film of the present invention exhibits a final tensile strength in the machine direction (MD) and / or transversal direction to the machine (CD) of about 10 to about 80 Megapascals (MPa), in some embodiments, of about 15 to about 60 MPa and, in some embodiments, from about 20 to about 50 MPa. While having good strength, it is also desirable that the film is not too stiff. A parameter that is indicative of the relative stiffness of the film (when dry) is the Young's modulus of elasticity, which is equal to the ratio between the tensile stress and the tensile strain and is determined from the slope of a
    26/39 stress-strain curve. For example, the film typically exhibits a Young's modulus in the machine direction (MD) and / or in the machine transverse direction (CD) from about 1 to about 100 Megapascals (MPa), in some embodiments, from about 2 at about 50 MPa and, in some embodiments, from about 5 to about 30 MPa.
    The film is also generally extensible, due to the fact that it has an elongation in the machine direction and / or transversal to the machine of about 250% or more, in some modalities, of about 400% or more, in some modalities, from about 500% to about 2,500% and, in some modalities, from about 700% to about 2,000%. In addition to being extensible, the film is also generally elastic in that it is able to recover at least about 50% of its stretched length after releasing the stretch force. The elasticity of the film can be characterized by its percentage adjustment, which is typically about 30% or less, in some modalities, from about 1% to about 30% and, in some modalities, from about 2% to about 10%.
    Depending on the intended application, the elastic film of the present invention can also be generally vapor and liquid impermeable or generally liquid impermeable, but still vapor permeable (i.e. breathable). Breathable films are, for example, often used in absorbent articles (for example, outer covering) where it is desired to allow moisture to escape from the absorbent core through the film. Likewise, bandages or dressings often use breathable films that allow the release of moisture from the skin at the wound site. Breathable films can be formed using a charge, as described above. Loaded films can be made breathable by stretching, which causes the polymer to break away from the load and create microporous passages. Techniques for forming microporous films are described, for example, in U.S. Patent No. 7,153,569, to Kaufman, et al. , as well as U.S. Patent Application Publications Nos. 2005/0208294, to Kaufman, et al. and 2006/0149199, for Topolkaraev, et al., which are incorporated in this document in their entirety by
    27/39 reference to them for all purposes. When used to initiate micropore formation, the total charge content in the film can vary from about 15% by weight to about 75% by weight, in some embodiments, from about 20% by weight to about 70% by weight and, in some embodiments, from about 25% by weight to about 65% by weight. Likewise, the thermoplastic composition described above can comprise from about 25% by weight to about 85% by weight, in some embodiments, from about 30% by weight to about 80% by weight and, in some embodiments , from about 35% by weight to about 75% by weight of the film.
    In modalities where it is desired to provide breathability, the film may exhibit a water vapor transmission rate (WVTR) of about 800 grams / m 2 - 24 hours or more, in some modalities, of around 1,000 grams / m 2 -24 hours or more, in some modalities, from around 1,200 grams / m 2 -24 hours or more and, in some modalities, from about 1,500 to about 10,000 grams / m 2 -24 hours. The film may also be impermeable to liquids, so that it limits the amount of liquid water that passes through it by applying pressure. More particularly, the film can withstand hydrostatic pressure
    (hydrohead) of about 5 kPa (50 millibar) or more , in some modalities, in fence of 7 kPa (70 millibar) or more, , in some modalities, in fence of 8 kPa (80 millibar) or more and , in some modalities, in fence of 10 kPa (100 millibar) or more without to allow
    the passage of liquid water.
    The elastic film of the present invention can be used in a wide variety of applications. For example, as indicated above, the film can be used on an absorbent article. An absorbent article generally refers to any article capable of absorbing water or other liquids. Examples of some absorbent items include, but are not limited to, absorbent personal care items, such as diapers, training pants, absorbent underwear, incontinence items, feminine hygiene products (e.g. sanitary pads, panty protectors, etc.), swimming clothes, baby wipes and so on; absorbent medical articles, such as clothing, fenestration materials, shields,
    Medical bedding, bandages, absorbent curtains and tissue tissues; food service wipes; clothing items; and so on. Various examples of such absorbent articles are described in U.S. Patent Nos. 5,649,916, to DiPalma, et al; 6,110,158, for Kielpikowski; 6,663,611, to Blaney, et al., Which are incorporated in this document in their entirety by reference to them for all purposes. Still other suitable articles are described in U.S. Patent Application Publication No. 2004/0060112 Al, to Fell et al. , as well as U.S. Patent Nos. 4,886,512, to Damico et al. ; 5,558,659, for Sherrod et al .: 6,888,044, for Fell et al .; and 6,511,465, for Freiburger et al. , all of which are incorporated in this document in their entirety by reference to them for all purposes. Suitable materials and processes for forming such absorbent articles are well known to those skilled in the art.
    Suitable materials and processes for forming such absorbent articles are well known to those skilled in the art. Typically, absorbent articles include a substantially liquid-impermeable layer (e.g., outer covering), a liquid-permeable layer (e.g., body facing coating, surge layer, etc.) and an absorbent core. In a particular embodiment, the compound of the present invention can be used in the provision of an elastic waist, leg cuff / cuff, extensible flap, side panel or external stretch cover applications.
    Various embodiments of an absorbent article that can be formed in accordance with the present invention will now be described in more detail. Referring to Figure 2, for example, one embodiment of a disposable diaper 250 is shown that generally defines a front waist section 255, a rear waist section 260 and an intermediate section 265 that interconnects the front and rear waist sections. The front and rear waist sections 255 and 260 include the general diaper portions, which are constructed to extend substantially over the user's front and rear abdominal regions, respectively, during use. The middle section 265 of the diaper includes the general portion of the diaper that is constructed to
    29/39 extend through the user's crotch region between the legs. Thus, the middle section 265 is an area where repeated liquid outbreaks usually occur in the diaper.
    Diaper 250 includes, without limitation, an outer cover, or front sheet 270, a liner facing the liquid-permeable body, or top sheet, 275, positioned in front of the front sheet 270, and a core body absorbent or liquid-retaining structure 280, such as an absorbent pad, which is located between the front sheet 270 and the top sheet 275. The front sheet 270 defines a length or longitudinal direction 286 and a width, or side direction 285 that, in the illustrated embodiment, it matches the length and width of the diaper 250. The liquid holding structure 280 generally has a length and width less than the length and width of the front sheet 270, respectively. Thus, marginal portions of the diaper 250, such as marginal sections of the front sheet 270 may extend beyond the end edges of the liquid retention structure 280. In the illustrated embodiments, for example, the front sheet 270 extends outwardly beyond the end edge edges of the structure holding liquid 280 to form side margins and edges of the diaper end 250. The top sheet 275 is generally coextensive with the front sheet 270, but can optionally cover an area that is larger or smaller than the area of the front sheet 270, as wished.
    To provide a better fit and help reduce the leakage of body exudates from the diaper 250, the diaper side edges and end edges can be elasticized with suitable elastic members, as will be explained below. For example, as shown in a representative way in Figure 2; diaper 250 can include leg straps 290 constructed to operably tension the side edges of diaper 250 to provide elastic leg straps that can fit tightly around the user’s legs to reduce leakage and provide greater comfort and appearance . Waist elastics 295 are used to stretch the edges of the diaper end 250 to provide waistband
    30/39 elasticized. The 295 waist elastics are configured to provide a resilient, tight and comfortable fit around the wearer's waist. The elastic film of the present invention may be suitable for use as leg elastics 290 and waist elastics 295.
    As is known, fastening means, such as hook and loop fasteners, can be employed to secure diaper 250 to a user. Alternatively, other fastening means, such as buttons, pins, pressure fasteners, adhesive tape fasteners, adhesives, fabric and loop fasteners or the like can be used. In the illustrated embodiment, diaper 250 includes a pair of side panels 300 (or flaps) to which fasteners 302, indicated as the hook part of a hook and loop fastener, are attached. In general, side panels 300 are attached to the side edges of the diaper in one of the waist sections 255, 260 and extend laterally from them. The side panels 300 can be elasticized or otherwise made elastomeric by the use of latent elastic materials of the present invention. Examples of absorbent articles that include elasticized side panels and selectively configured attachment flaps are described in PCT Patent Application WO 95/16425, to Roessler; U.S. Patent 5,399,217.9, to Roessler et al. , U.S. Patent. 5,540,796, for Fries; and U.S. Patent 5,595,618 to Fries, each of which is incorporated herein in its entirety by reference to it, for all purposes.
    Diaper 250 can also include a surge control layer 305, located between the topsheet 275 and the liquid holding structure 280, to quickly accept liquid exudates and deliver the liquid exudates to the liquid holding structure 280 inside the diaper 250. Diaper 250 may also include a ventilation layer (not shown), also called a spacer, or spacing layer, located between the liquid holding structure 280 and the front sheet 270 to isolate the front sheet 270 from the frame liquid retention 280 to reduce moisture in clothing on the outer surface of a breathable outer cover, or front sheet 270. Examples of control layers
    31/39 suitable outbreak 305 are described in U.S. Patent No. 5,486,166, to Bishop et al. , and U.S. Patent No. 5,490,846, to Ellis.
    As shown in a representative manner in Figure 2, the disposable diaper 250 can also include a pair of containment flaps 310 that are configured to provide a barrier to the lateral flow of body exudates. The containment flaps 310 may be located along the side edges opposite laterally from the diaper adjacent to the side edges of the liquid holding structure 280. Each containment flap 310 typically defines a non-clamped edge that is configured to maintain a vertical, perpendicular configuration. at least in the middle section 265 of the diaper 250 to form a seal against the user's body. The containment flaps 310 may extend longitudinally along the entire length of the liquid holding structure 280 or they may extend only partially along the length of the liquid holding structure. When the containment flaps 310 are shorter in length than the liquid holding structure 280, the containment flaps 310 can be selectively positioned anywhere along the side edges of the diaper 250 in the intermediate section 265. Such containment flaps 310 are generally known to persons skilled in the art. For example, constructions and arrangements suitable for containment flaps 310 are described in U.S. Patent No. 4,704,116, to Enloe.
    Diaper 250 can be of various suitable forms. For example, the diaper may be generally rectangular, T-shaped or approximately hourglass-shaped. In the embodiment shown, diaper 250 has a generally I-shaped shape. Other suitable components that can be incorporated into the absorbent articles of the present invention can include waist flaps and the like, which are generally known to those skilled in the art. Examples of diaper configurations suitable for use in conjunction with the elastic film of the present invention that may include other components suitable for use in diapers are described in U.S. Patent Nos. 4,798,603, to Meyer et al .; 5,176,668, to Bernardin; 5,176,672, for Bruemmer
    32/39 et al .; 5,192,606, to Proxmire et al .; and 5,509,915, for Hanson et al., which are incorporated in this document in their entirety by reference to them for all purposes.
    The various regions and / or components of the diaper 250 can be assembled together using any known fixing mechanism, such as thermal, adhesive, ultrasonic, etc. connections. Suitable adhesives may include, for example, hot adhesives, pressure sensitive adhesives and others. When used, the adhesive can be applied as a uniform layer, a printed layer, a spray pattern or any of the separate lines, swirls, or dots. In the illustrated embodiment, for example, the topsheet 275 and the backsheet 270 can be assembled together and with the liquid retention structure 280 with the adhesive lines, such as a hot-melt pressure sensitive adhesive. Likewise, other components of the diaper, such as elastic members 290 and 295, fixing members 302 and the surge layer 305 can be mounted on the article using the fixing mechanisms identified above.
    Although various configurations of a diaper have been described above, it should be understood that other configurations of diapers and absorbent articles are also included in the scope of the present invention. Furthermore, the present invention is in no way limited to diapers. In fact, several examples of absorbent articles are described in U.S. Patent Nos. 5,649,916, to DiPalma, et al. ; 6,110,158, for Kielpikowski; 6,663,611, to Blaney, et al., Which are incorporated in this document in their entirety by reference to them for all purposes. In addition, other examples of personal care products that may incorporate such materials are training pants (such as in the side panel materials) and women's care products. For illustrative purposes only, training pants suitable for use with the present invention and various materials and methods for constructing training pants are described in U.S. Patent Nos. 6,761,711, to Fletcher et al. : 4,940,464, for Van Gompel et al. ·. 5,766,389, for Brandon et al. : and U.S. Patent No. 6,645,190, to Olson et al., which are
    33/39 incorporated in this document in its entirety by reference to them, for all purposes.
    The present invention can be better understood by reference to the following examples.
    Test Methods
    Traction properties:
    The strip's tensile strength values were determined in substantial compliance with the ASTM D-5034 standard. A type of constant extension rate of the tensile tester was used. The tensile tester system was a 1 / D tensile tester from Sintech, which is available from MTS Systems Corp. The tensile tester was equipped with the TESTWORKS 4.08B software from MTS Corporation to support the test. An appropriate cell load was selected so that the tested value was within the range of 10-90% of the full scale load. The film samples were initially cut into 3.0 mm central dog bone shapes before testing. The samples were kept between supports with an anterior and posterior face measuring 25.4 mm x 76 mm. The support faces were rubberized, and the largest dimension of the support was perpendicular to the direction of the pull. The clamping pressure was pneumatically maintained at a pressure of 276 kPa (40 pounds per square inch). The tensile test was performed using a length measurement of 18.0 millimeters and a burst sensitivity of 40%. Five samples were tested by applying the test load along the machine direction and five samples were tested by applying the test load along the transverse direction. During the test, the samples were stretched at a crosshead speed of about 127 millimeters per minute, until rupture occurred. The modulus, peak stress, elongation (ie% deformation at peak load) and elongation were measured.
    Cycle Test
    The materials were tested using a cyclic test procedure to determine the percentage adjustment. In particular, a 1 cycle test was used for 100% defined elongation. The test was done at a constant rate from the Sintech Corp. extension tester. 1 / D equipped with software
    34/39
    TESTWORKS 4.08B obtained from MTS Corporation, to support the test. The test was carried out under ambient conditions. For this test, the sample size was 1 inch (2.54 cm), in the direction transverse to the machine, by 3 inches (7.6 cm), in the direction of the machine. Before the test, the pure measurement of the film length was 51 millimeters. The claw size was 3 inches (7.6 centimeters) wide and the separation between the claws was 4 inches (10.1 cm). The samples were loaded so that the direction of the sample machine was in the vertical direction. A preload of about 20 to 30 grams was defined. The test pulled the sample up to 100% elongation at a speed of 20 inches (50.8 centimeters) per minute, held the sample in an elongated state for 30 seconds, and then returned the sample to zero elongation at a speed of 20 inches (50.8 centimeters) per minute. After that, the length of the film was measured immediately, as well as at 10, 20 and 30 minutes. The percentage not recovered (percentage adjustment) was determined by subtracting the film length 30 minutes after the cycle test from the original film length, and then dividing this number by the original film length.
    Materials Used • Native corn starch was obtained from Cargill.
    • Glycerol was obtained from Cognis Corp.
    • ECOFLEX® F BX 7 011 was obtained from BASF Corp.
    • EXCEL P-40S is a non-ionic surfactant obtained from Kao Corp.
    • VLSTAMAXX ™ 1120 and 6102 are metallocene-catalyzed ethylene / propylene copolymers, obtained from Exxonmobil Corp.
    • ESTANE ™ 58245 is a thermoplastic polyurethane based on aromatic polyether produced by Noveon and later by Lubrizol Advanced Materials. In the examples below, the
    35/39 letter N represents the resin purchased from
    Noveon, and the letter L stands for resin
    purchased from Lubrizol. 0 ter polyurethanea T g of -37 ° C and a T m in 135-139 ° C. 5 • DESMOPAN ™ DP 9370 is a polyurethanethermoplastic base in aromatic polyether
    obtained from Bayer Material Science. It has a T g of -70 ° C and a T m of 188-199 ° C.
    EXAMPLE 1
    A starch-based mixture was formed from 73.5% by weight of native corn starch, 1.5% by weight of Excel - P-40S and 25% by weight of glycerin. These components were fed into a cogiratory double screw extruder (ZSK30, Werner and Pfleiderer Corporation, Ramsey, New Jersey, USA).
    The diameter of the extruder was 30 mm and the length of the screws was up to 1,328 mm. The extruder has 14 barrels, numbered consecutively from 1 to 14 from the hopper to the mold. The temperature profile of seven (7) heating zones of the extruder was 70 and C, 85 ° C, 140 ° C, 145 ° C, 150 ° C, 150 ° C and 145 ° C, respectively. The speed of the screw was fixed at 160 rpm to obtain a torque between 31 and 36% and a Pf using 3,171 ~ 3,309 kPa (460 ~ 480 psi).
    EXAMPLE 2
    A starch-based combination was formed from 33.1% by weight of native corn starch, 0.7% by weight of Excel P-40S, 11.2% by weight of glycerin and 55% by weight and ECOFLEX ® F BX 7011. These components were fed into a cogiratory twin screw extruder (ZSK-30, Werner and Pfleiderer Corporation, Ramsey, New Jersey, USA). The diameter of the extruder was 30 mm and the length of the screws was up to 1,328 mm. The extruder has 14 barrels, numbered consecutively from 1 to 14 from the hopper to the mold. The temperature profile of seven (7) heating zones of the extruder was 70 and C, 85 ° C, 140 ° C, 145 ° C, 150 ° C, 150 ° C and 156 ° C, respectively. The screw speed was fixed at 160 rpm to obtain a torque between 32 and 38% and a melting P of 1,517 ~ 1,586 kPa (220 ~ 230 psi).
    36/39
    EXAMPLES 3 to 19
    The thermoplastic combination of Example 2 was then combined dry with various elastomers (VISTAMAXX ™ 1120, VISTAMAXX ™ 6102, DESMOPAN ™ DP9730A and ESTANE ™ 58245) in different concentrations. The films were melted by adding the mixture to a gravimetric feeder (K-Tron America, Pitman, NJ, model KCM-2) that feeds the combinations into a Prism USALAB 16 twin screw extruder (Thermo Electron Corp., Stone, England). The speed of the extruder was adjusted to 150 rpm. A vent was also provided in zone 9 to release the steam generated due to the presence of moisture in the plasticizer and intrinsic moisture in the starch. For Examples 3 to 18, the temperature profile for zones 1 to 10 was 120 and C, 130 ° C, 150 ° C,
    170 ° C, 180 ° C, 180 ° C, 180 ° C, 175 ° C, 175 ° C and 170 ° C, respectively.
    For Example 19, the temperature profile for zones 1 to 10 was 120 and C, 130 ° C, 150 ° C, 170 ° C, 175 ° C, 175 ° C, 175 ° C, 175 ° C,
    170 ° C and 160 ° C, respectively. The compositions of the film are described below in Table 1:
    Table 1: Film Composition
    Example VISTAMAXX ™ 1120 (% by weight) VISTAMAXX ™ 6102 (% by weight) DESMOPAN ™ DP9730A (% by weight) ESTANE ™ 58245 (% by weight) Mixture of Starch of Example 2 (% by weight) 3 90 0 0 0 10 4 60 0 0 0 40 5 30 0 0 0 70 6 0 70 0 0 30 7 0 30 0 0 70 8 0 0 70 0 30 9 0 0 30 0 70 10 0 0 0 90 10 11 0 0 0 80 20 12 0 0 0 70 30 13 0 0 0 60 40 14 0 0 0 50 50 15 0 0 0 40 40 16 0 0 0 30 30 17 0 0 0 20 20 18 0 0 0 10 10 19 0 00 100
    37/39
    Once formed, the tensile properties of the film samples were tested as described above. The results are shown below in Table 2.
    Table 2: Mechanical Properties of Film Samples
    Sample No. Sample Description Composition Mechanical Properties of Film Film thickness Module (MPa) Peak Stress (MPa) Stretching (%) MD (mm) CD (mm) MD CD MD CD MD CD Example3 VM1120 / Example2 90/10 0.04826 0.04318 7.6 8.5 22.8 17.2 741.5 939.6 Example4 VM1120 / Example 2 60/40 0.0635 0.0508 11.3 10.1 20.7 10.9 813.0 859.1 Example5 VM1120 / Example 2 30/70 0.0635 0.04572 15.3 10.9 21.8 11.4 837.0 753.7 Example6 VM6120 / Example 2 70/30 0.0635 0.06096 8.6 5.7 14.6 15.2 637.5 1,000.6 Example7 VM6120 / Example 2 30/70 0.0635 0.05588 18.5 17.4 22.9 13.7 808.3 819.3 Example8 DP9730A /Example 2 70/30 0.06096 0.05588 12.7 8.3 45.7 30.0 750.3 774.8 Example9 DP9730A /Example 2 30/70 0.04826 0.04318 26.1 24.2 36.4 26.8 778.3 839.5 Example10 It's in the/Example 2 90/10 0.06604 0.04826 16.1 9.6 26.8 22.2 579.6 600.1 Example11 It's in the/Example 2 80/20 0.0508 0.0508 7.8 9.7 32.3 22.7 661.2 754.1 Example12 It's in the/Example 2 70/30 0.04826 0.04826 11.5 11.5 21.9 21.9 740.5 740.5 Example13 It's in the/Example 2 60/40 0.05334 0.05334 13.8 9.4 31.0 21.6 687.4 746.5 Example14 It's in the/Example 2 50/50 0.05588 0.0508 22.1 17.3 30.2 24.3 693.2 839.9 Example15 It's in the/Example 2 40/60 0.0508 0.04826 22.7 20.1 27.2 19.9 657.5 755.5 Example16 It's in the/Example 2 30/70 0.04064 0.04064 22.7 18.4 24.8 16.8 596.4 702.2 Example17 It's in the/Example 2 20/80 0.05334 0.04826 19.4 19.1 24.9 15.3 679.7 667.4 Example18 It's in the/Example 2 10/90 0.04826 0.04572 24.5 23.8 20.7 14.1 592.1 626.6 Example19 It's in the/Example 2 0/100 0.04064 0.03556 21.7 21.4 20.1 13.2 631.6 597.6
    As indicated, the film samples from Examples to 19 had excellent elongation properties.
    In addition, to evaluate the elasticity of the film, the film samples were also subjected to cycle tests,
    38/39 as described above. The results are shown below in
    Table 3.
    Table 3. Mechanical Stretch of the Film and Recovery
    Sample No. Sample Description Guidance Original After Test (mm) After 10 min. (mm) After 20 min. (mm) After 30 min. (mm) % Not recovered Example 3 VM 1120 / Example2 (90/10) MD 51.0 51.7 50.7 50.3 50.0 -2.0 CD 51.0 51.3 50.0 50.0 50.0 -2.0 Example 4 VM 1120 / Example2 (60/40) MD 51.0 58.3 56.3 56.3 56.3 10.4 CD 51.0 57.7 55.7 55.3 55.3 8.4 Example 5 VM 1120 / Example2 (30/70) MD 51.0 66.3 63.3 63.3 63.0 23.5 CD 51.0 70.6 66.0 66.3 66.3 30.0 Example 6 VM6120 / Example2 (70/30) MD 51.0 54.3 53.0 52.3 52.3 2.5 CD 51.0 52.3 51.0 51.0 51.0 0.0 Example 7 VM 6120 / Example2 (30/70) MD 51.0 68.0 65.0 64.7 64.7 26.9 CD 51.0 69.3 66.7 66.0 66.0 29.4 Example 8 DP9730A / Example2 (70/30) MD 51.0 52.3 51.0 51.0 51.0 0.0 CD 51.0 51.0 50.0 50.0 50.0 -2.0 Example 9 DP9730A / Example2 (30/70) MD 51.0 65.3 62.3 62.3 62.3 22.2 CD 51.0 66.3 63.7 63.0 62.7 22.9 Example 10 Estano / Example 2 (90/10) MD 51.0 52.0 50.7 50.7 50.7 -0.7 CD 51.0 52.0 51.0 51.0 51.0 0.0 Example 11 Stano / Example 2 (80/20) MD 51.0 53.0 51.7 51.0 51.0 0.0 CD 51.0 52.0 51.0 51.3 51.0 0.0 Example 12 Stano / Example 2 (70/30) MD 51.0 53.7 52.0 52.0 52.0 2.0 CD 51.0 54.3 52.3 52.0 52.0 2.0 Example 13 Stano / Example 2 (60/40) MD 51.0 57.0 55.0 55.0 55.0 7.8 CD 51.0 57.0 55.3 54.7 54.3 6.5 Example 14 Stano / Example 2 (50/50) MD 51.0 60.3 57.7 57.0 56.7 11.1 CD 51.0 66.3 62.7 61.3 61.3 20.3 Example 15 Stano / Example 2 (40/60) MD 51.0 64.7 61.7 61.3 61.0 19.6 CD 51.0 68.0 63.7 64.0 63.7 24.8 Example 16 Stano / Example 2 (30/70) MD 51.0 65.0 62.3 62.0 62.0 21.6 CD 51.0 68.7 65.3 65.3 65.3 28.1 Example 17 Stano / Example 2 (20/80) MD 51.0 68.3 66.7 66.3 66.3 30.1 CD 51.0 70.3 67.7 68.0 67.7 32.7 Example 18 Stano / Example 2 (10/90) MD 51.0 72.0 69.3 68.3 68.3 34.0 CD 51.0 70.3 67.0 67.0 66.7 30.7 Example 19 Example 2 MD 51.0 73.7 71.3 71.3 70.7 38.6 CD 51.0 80.3 76.7 76.0 76.0 49.0
    As indicated, the permanent setting was very low. For example, Example 4 exhibited a permanent adjustment of 8% and 10% in the machine direction and in the machine transversal direction, respectively, despite having 40% by weight of a non-elastomeric component.
    39/39
    Although the invention has been described in detail in relation to its specific modalities, it will be observed that people skilled in the art, by understanding the above, can easily conceive of changes, variations and equivalents to these modalities. Accordingly, the scope of the present invention must be assessed as that of the appended claims and any equivalents thereof.
    权利要求:
    Claims (4)
    [1]
    1. Elastic film, characterized by the fact that it comprises a thermoplastic composition which comprises
    fur one less polymer in starch that constitutes 1% by weight The 30% by weight of the content in polymer of movie, fur any less one elastomeric polymer what constitutes in 30% by weight 95% in
    weight of the polymer content of the film, and at least one plasticizer constituting 0.1% by weight to 30% by weight of the film, where the weight ratio of elastomeric polymers to starch polymers in the film is 1 to 10 , the elastic film showing an elongation in the machine direction and in the machine transverse direction of 250% or more, where the elastomeric polymer includes an olefinic elastomer having a density of 0.85 to 0.89 g / cm 3 selected from a metallocene-catalyzed ethylene / α-olefin copolymer, metallocene-catalyzed propylene / α-olefin copolymer, or a combination thereof; or wherein the elastomeric polymer comprises a thermoplastic polyurethane synthesized from a polyol and an organic diisocyanate and having a melting point of 75 ° C to 250 C. S
    [2]
    2/4 previous claims, characterized by the fact that the elastomeric polymer includes a thermoplastic polyurethane synthesized from a polyol and an organic diisocyanate, preferably in which the polyol includes a polyether polyol and the organic diisocyanate includes a diisocyanate aromatic.
    5. Elastic film according to any one of the preceding claims, characterized in that the plasticizer includes a polyhydric alcohol.
    6. Elastic film according to any one of the preceding claims, characterized in that the starch polymers constitute from 5% by weight to 20% by weight of the polymer content of the film, the elastomeric polymers constitute from 50% by weight to 80% by weight of the polymer content of the film, and the weight ratio of elastomeric polymers to starch polymers in the film is 3 to 6.
    7. Elastic film according to any one of the preceding claims, characterized by the fact that the plasticizers constitute from 1% by weight to 10% by weight of the film.
    8. Elastic film according to any one of the preceding claims, characterized in that the film additionally comprises a synthetic biodegradable polyester, such as polycaprolactone, polyesteramide, modified polyethylene terephthalate, polylactic acid or a copolymer or terpolymer thereof, polyglycolic acid , polyalkylene carbonate, polyhydroxyalkanoate, poly-3-hydroxybutyrate, poly-3-hydroxyvalerate, poly-3-hydroxybutyrate-co-4-hydroxybutyrate, copolymer of poly-3-hydroxybutyrate-co-3-hydroxyvalerate, poly-3-hydroxybutyroxy-3-hydroxy -hexanoate, poly-3-hydroxybutyrate-co-3-hydroxyoctanoate, poly-3-hydroxybutyrate-co-3-hydroxydecanoate, poly-3-hydroxybutyrate-co-3-hydroxyoctadecanoate, aliphatic polymers based on succinate, aromatic polyester, aromatic polyester
    Petition 870190115260, of 11/08/2019, p. 12/12
    2. Elastic film according to claim 1, characterized by the fact that the starch polymer is a native starch, preferably in which the native starch has an amylose content of 10% to 40% by weight, more preferably in which the native starch has an average numerical molecular weight ranging from 50,000 to 1,000,000 grams per mol.
    [3]
    3/4 modified, aliphatic-aromatic copolyester or a combination thereof.
    9. Elastic film according to any of the preceding claims, characterized by the fact that the film is impermeable to liquids.
    10. Elastic film according to any one of the preceding claims, characterized by the fact that the elastic film has an elongation in the machine direction and in the machine transversal direction from 500% to 2,500%; and / or where the elastic film exhibits a Young elasticity module in the machine direction and in the machine transversal direction from 1 to 100 Megapascals.
    11. Elastic film according to any of the preceding claims, characterized by the fact that the elastic film exhibits a permanent adjustment of 1% to 30%.
    12. Absorbent article, characterized by the fact that it comprises the elastic film as defined in any one of the preceding claims, wherein the absorbent article contains a body portion that includes a liquid-permeable top sheet, an anterior sheet generally impermeable to liquids and an absorbent core positioned
    between the previous sheet and the top sheet. wake up with The 13. Article / pad in claim 12, characterized by fact that The leaf previous includes the movie elastic. 14. Article / pad in wake up with The
    claim 12, characterized by the fact that it additionally comprises one or more elastic members that include the elastic film, such as leg elastics, waist elastics or a combination thereof.
    15. Method for forming an elastic film, characterized in that it comprises combining by melting mass a composition comprising at least one polymer of starch which constitutes from 1% by weight to 30% by weight of the polymer content of the film, at least least one elastomeric polymer that
    Petition 870190115260, of 11/08/2019, p. 9/12
    Elastic film according to any one of the preceding claims, characterized in that the elastomeric polymer includes an olefinic elastomer having a density of 0.85 to 0.89 g / cm 3 selected from an ethylene / a-olefin copolymer catalyzed by metallocene, propylene / α-olefin copolymer catalyzed by metallocene, or a combination thereof.
    4. Elastic film according to any of the
    Petition 870190115260, of 11/08/2019, p. 7/12
    [4]
    4/4 constitutes 30% by weight to 95% by weight of the polymer content of the film and at least one plasticizer constituting 0.1% by weight to 30% by weight of the film, where the weight ratio of polymers elastomeric for starch polymers in the film is 5 1 to 10, the elastic film exhibiting an elongation in the machine direction and in the machine transverse direction of 250% or more, and the method further comprising extruding the composition onto a surface to form a movie; wherein the elastomeric polymer includes an olefin elastomer having a density of 0.85 to 0.89 g / cm 3 selected from a metallocene-catalyzed ethylene / α-olefin copolymer, metallocene-catalyzed propylene / α-olefin copolymer, or a combination thereof; or wherein the elastomeric polymer includes a thermoplastic polyurethane synthesized from a polyol and an organic diisocyanate and having a melting point of 75 S C to 250 S C.
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    同族专利:
    公开号 | 公开日
    AU2011340218B2|2016-05-19|
    CO6761301A2|2013-09-30|
    US20120150137A1|2012-06-14|
    WO2012077003A2|2012-06-14|
    KR101968470B1|2019-04-12|
    EP2649117A4|2015-11-25|
    EP2649117A2|2013-10-16|
    KR20190018172A|2019-02-21|
    BR112013014228A2|2016-09-13|
    CN103261288A|2013-08-21|
    RU2013129301A|2015-01-20|
    MX2013006452A|2013-06-28|
    WO2012077003A3|2012-08-30|
    EP2649117B1|2017-04-19|
    CN103261288B|2016-08-10|
    KR20130126925A|2013-11-21|
    RU2584201C2|2016-05-20|
    AU2011340218A1|2013-05-30|
    US8889945B2|2014-11-18|
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    法律状态:
    2019-08-13| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-02-04| B09A| Decision: intention to grant|
    2020-03-10| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 31/10/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US12/962,749|2010-12-08|
    US12/962,749|US8889945B2|2010-12-08|2010-12-08|Elastic film containing a renewable starch polymer|
    PCT/IB2011/054830|WO2012077003A2|2010-12-08|2011-10-31|Elastic film containing a renewable starch polymer|
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