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    • 专利摘要:

    公开号:SU900796A3
    申请号:SU742029567
    申请日:1974-05-08
    公开日:1982-01-23
    发明作者:Осима Акира；Обе Кацунори；Камеда Нобуо
    申请人:Мицубиси Рэйон Ко., Лтд. (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to the manufacture of cast resin products from synthetic resins, which have an excellent resistance to surface abrasion.
    There is a known method for imparting the wear resistance of the surface of molded articles made of synthetic resin / W. Diethyl acrylate diethylene- or triethylene glycol or alkanediol with the number of atoms 3-6, i.e. the compound capable of crosslinking and having two methacryloyloxy groups in the molecule is deposited in the form of a film on the inner surface of the casting mold and thereafter the lower alkyric acid of methacrylic acid is loaded into the mold and the polymerization of the dimethylacrylate of the film and the lower methacrylic acid apicalyl ester is loaded a molded article of JJQ polymerized methacrylate is formed, having a crosslinked dimethyl acrylate surface with improved wear resistance 1.
    There is also known a method for producing a molded product, according to which 35
    The surface of the mold is first coated with a compound capable of crosslinking and having two acrypoxy or methacryloxy groups in the molecule, and then fully polymerized, covered with a film of high polymer having no affinity for it and tightly adhering, after which the one-dimensional material is loaded into the mold product and polymerized with a gradual removal of the molded product from the mold.
    A compound having two acryloxy-non-acryloxy groups is transformed into a film of uniform thickness covering the entire surface of the mold, and therefore a molded product can be obtained that is superior in durability and optical properties 2.
    A film with improved wear resistance on the inner surface of the mold, obtained by polymerizing a monomeric material capable of crosslinking and having at least two acryloxy or methacryloxy groups in a molecule, has a surface smoothness and uniform thickness; such a degree of curing that the film was unable to dissolve or swell in the monomeric material to form products, upon contact with it, such an ability to stick or detach from the inner surface of the mold that the film adheres sufficiently firmly to the inner surface of the mold during the polymerization of the monomeric material for an article upon contact with it, but is easily separated from the inner surface of the mold after the polymerization of the monomer material into a polymeric article is completed.
    A wear-resistant surface polymer layer with the specified characteristics can be obtained if the material for film formation is chosen appropriately and the material is polymerized when the material on the mold surface is covered with a coating polymer film firmly adhered to the applied material. However, the adhesion between the surface of the mold and the wear-resistant polymer layer formed from the applied material and the adhesion between this polymer layer and the covering film must be so small that the covering film is able to easily separate from the polymer layer and this polymer layer is easily separated from the form. In addition, the adhesion between the surface of the mold and the wear-resistant polymer layer should be stronger than between the polymer layer and the covering film. However, these requirements are not always met, i.e. when the coating film is separated from the wear-resistant polymer layer after it is cured, the cured polymer layer is sometimes undesirable to separate from the surface of the mold, even if the coating film is appropriately selected from those that have no wear resistant material because the adhesion force between the polymer layer formed from the applied material and the covering film usually increases with the degree of cure of the applied material, and the strength dgezii strongly dependent on the temperature at which the coating film is separated from the cured layer, and
    also from contamination of the mold present on the surface and the degree of drying of the mold surface.
    In the case where the curing of the material forming the wear-resistant polymer layer is carried out in a continuous manner and the polymer film is used as a coating, all means for stretching the polymer
    films and for transporting the mold covered with the material forming the polymer layer require an increase, since the period of time during which the applied material forming the polymer layer cures is long.
    Thus, according to known methods, cast products of insufficient wear resistance are obtained and with
    0 insufficient good surface.
    The purpose of the invention is to increase the wear resistance of the cast product and improve its appearance.
    This goal is achieved by subjecting the monomer layer to polymerization under irradiation in the presence of a photosensitizer until a conversion equal to at least iOI, removing the coating polymer film, and prepolymerizing the obtained product to a conversion of at least 951.
    The method for producing a molded article made of synthetic resin having a wear-resistant polymeric surface layer which is integral with the product is carried out as follows.
    Applied to all or part of the inner surface of the mold.
    LIQUID polymerizable material selected from the group comprising a compound having at least two acryloxy- (CKj-G -COO) and / or methacryloxy- (((CH. . A) -COO) -groups in a molecule and having a molecular weight of at least 150, a mixture consisting of at least 30 wt.  % of this compound and not more than 70 wt.  I, at least another copolymerizable monoethyl unsaturated compound, and a partially polymerized product of this compound or this mixture.  The polymerization material is polymerized to such an extent that the polymerized material does not dissolve or swell in the monomer being converted into the polymer product, forming a wear-resistant polymer layer on the inner surface of the mold.  The loading of the monomer mixture or the product of the polymerization initiator into the mold is given, followed by the polymerization of the monomer, and then the release of the cast from the mixture at the end of the polymerization.  Polymerization takes place in two stages.  In the first stage, the polymerizing material is polymerized while it is covered with a tightly adhering coating film, which has a weak affinity or does not have it, until the gel content reaches 0 - 95%.  In the second stage, polymerization is continued in the absence of a covering film until the gel content increases by 0.5-60 ° 4 to 901.  In the first stage, the polymerization is carried out until the gel content is 0 95 wt.  , more preferably 60- 90 wt.%, which remains insoluble when extracted with acetone at 50 ° C and is determined by immersing the film of polymerized material in acetone at 50 ° C and drying the film in vacuum at 50 ° C.  The appropriate gel content varies depending on the polymerizing or polymerizable material.  When the gel content reaches a preferred value, the coating polymer film, adherent to the polymerized material, is easily separated from the polymerized material without undesirable separation of the polymerized material from the surface of the mold.  In the second stage, the polymerization is carried out until the polymerized material is unable to swell or dissolve in the monomer of the polymer article.  The content of the gel at the end of the second stage is usually not less than 90%, preferably not less than 95%.  The appropriate gel content varies depending on the polymerizing material, the polymerization initiator, its quantity and the thickness of the polymerized material.  If the gel content at the end of the first polymerization stage is large, the increase in the gel content in the second polymerization stage can be minimal.  If the gel content at the end of the first stage of polymerization is small, the increase in rS l content in the second stage should be large, so that the final gel content is at least 90%.  The increase in the content of the gel in the second stage of polymerization is in the range of 0.5-60%, preferably 1.  If the gel content at the end of the first polymerization stage is below 40%, it is difficult to increase the gel content to the desired level in the second polymerization stage.  If the gel content at the end of the first polymerization stage is about 95%, the polymerized material has an undesirable tendency to separate from the surface of the mold when the coating film is separated from the polymerized material.  Each part of the linear form has one surface on which a wear-resistant layer of polymerizable material is formed, and these parts are assembled to form a mold.  The form is filled with a mixture consisting of a monomer to form a polymer product and a polymerization initiator.  The mold is then closed and polymerization is carried out.  At the end of the polymerization, the mold suits are removed from the molded article.  The wear-resistant polymer layer formed on one surface of the mold parts completely passes to the molded product that is taken out of the mold.  Thus, it is possible to obtain molded products from synthetic polymers in which the wear-resistant polymeric surface layer is integral with the product.  The adhesion between the wear-resistant polymeric surface layer and the molded polymer product of the present invention is much stronger than the adhesion in a molded product obtained by a method in which a wear-resistant polymeric surface layer is formed by polymerizing the monomeric material when the monomeric material is covered with a film that closely adheres to it during the course polymerization.  The reason for this is that the wear-resistant surface layer formed by two-step polymerization of the proposed method is hard enough not to swell or dissolve in the monomer for the product, and the part close to the surface of the wear-resistant polymer surface layer is insufficiently polymerized, t. e.  there are 8 states with high affinity for the monomer for the product.  The thickness of the layer of polymerized material is in the range of 0.00–0.5 mm, preferably 0,, 01, and more preferably O, .05 m. If the layer is very thin, it can be scraped off from the product under highly abrasive action.  In addition, it is difficult to obtain a uniform layer of polymerized material.  When the thickness does not exceed the upper limit, the volume of the polymerizable material of the wear-resistant layer is suddenly reduced during the gylumerization, and an optically distorted product is obtained with cracks on the surface.  The polymerization is carried out by heating a monomer mixture containing a thermally decomposing polymerization initiator or by irradiating with ultraviolet light a monomer mixture containing a photosensitizer or gamma rays, or other ionizing radiation.  The polymerization conditions are highly dependent on the polymerizable compound and the polymerization initiator and its quantity.  The duration of the polymerization is approximately the same as in the case where the polymerization is carried out at one stage.  Preferred polymerization methods are: a) carrying out polymerization, by irradiating with ultraviolet rays, when the polymerized material is covered with an organic high polymer film in the first polymerization stage and in the second stage there is no polymer film; b) the implementation of the first polymerization by heating the monomer mixture when the monomer mixture is covered with a film of high organic polymer or metal film, and the implementation of the second polymerization by irradiating with ultraviolet rays in the absence of a polymer or metal film.  The coating film must be of a material that has a weak affinity or does not have it to the polymerized material, forming a wear-resistant surface layer.  Such a material may be selected from organic high polymers, metals or inorganic materials, for example glass.  The coating film should have a smooth surface and be in the form of a sheet or plate.  The thickness of the film or plate depends on oxygen permeability, hardness and polymerization conditions.  The coating material must be chosen, in particular, depending on the polymerization method.  For example, a material capable of transmitting ultraviolet rays, suitable for the method of polymerization by ultraviolet rays, and heat-resistant material suitable for polymerization by heating.  The coating material may be in the form of a cylinder or a roll of large diameter if the polymerization of the material of the surface layer is carried out in a continuous manner and ends in a short time.  The most preferred films are organic high polymer films.  The films can be, for example, polyvinyl alcohol and its acetylated product, cellophane or regenerated cellulose, water resistant cellophane or water resistant cellulose, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene, polyamide and polyester.  The polypropylene film of them tends to stick strongly to the wear-resistant polymer layer, if the polymer layer is sufficiently cured by polymerization with ultraviolet rays, and therefore suitable for the two-stage polymerization proposed from Oreteni.  Parts of the mold, some of which are applied and polymerized, are usually plates made of, for example, inorganic glass, stainless steel, or metal and aluminum clad with a chromonickel.  The liquid polymerizable material, which is converted into a wear-resistant surface layer by the two-step polymerization of the present invention, is a compound having at least two acryloxy and / or methacryloxy groups in the molecule, and these groups are preferably associated with an aliphatic hydrocarbon residue or its derivatives, for example aliphatic hydrocarbon groups bound by at least one ether bond and having a molecular weight of at least 150. The polymerizing material may be a mixture consisting of such Union and other copolymerizable monomers.  The mixture should contain the indicated compound in an amount of at least 30 vol.  %, because if it is less difficult to obtain a surface wear layer, it is hard enough that it does not swell or dissolve in the monomer for the product, and which often leads to products with linear cracks on the surface and mediocre wear resistance.  The polymerizable compound may also be a partially polymerized product of the compound.  Preferred compounds are compounds. derived from a polyhydric alcohol and acrylic or methacrylic acid, or their functional derivatives, or those compounds which are derived from a polyhydric alcohol, polycarboxylic acid and acrylic or methacrylic acid, and their functional derivatives.  Preferred polyhydric alcohols used to obtain these compounds are, for example, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, having an average molecular weight of 300-1000, propylene glycol, dipropylene glycol 1,3-propandiol 1,3-butanediol | 2,3-butanediol, 1, -butanediol, 1,5-pentadiol; 1,6-hexanded, neopentyl glycol; C2,2-di-methyl-1,3 propanediol) -2-ethyl-1,3 hexanediol; 2,2-tioditethanol; 1, -cyclohexanedimethanol; 1,1,1-trimethylolpropane; pentaglycerol (1,1,1-trimethylol-ethane; glycerin-1,2,4-butanetriol; 1,2,6 - hexanetriol; pentaerythritol (2,2bishydroxymethyl-1, 3-propandol) ), digly cerin and dipentaerythritol.  Preferred compounds derived from these polyhydric alcohols and acrylic or methacrylic acid or their derivatives are having an aliphatic carbon residue of not more than 20 carbon atoms.  They include, for example, diethylene glycol diacrylate, diethylene glycol dimethacrylate, -trietilenglikol diacrylate, triethylene glycol dimethacrylate, tetraethylene glycol diacrylate, tetraethylene glycol dimethacrylate, 1,4-butadnol diacrylate, 1,4-butandial dimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, trimethylolpropane triacrylate and pentaglycerol triacrylate.  Compounds derived from a polyhydric alcohol, polycarboxylic acid, and acrylic or methacrylic acid have equimolecular 1-hydroxyl groups from a polyhydric alcohol and carboxyl groups from lolicarboxylic acid and acrylic or methacrylic acid.  Of these, preferred compounds are those obtained by the reaction of a glycol of the formula HO-Rj-OH (1) or its derivative, a dicarboxylic acid of the formula RHCN-H-COOH (2) and acrylic or methacrylic acid or its chloride or ester (3) with molecular ratio (1): (2):: (3) (p-I): p (p + 2) -2,2 and represented by the formula CH, CCO R —OCR, —CO} R, —OCC CH ,, о о о о Where RJ is hydrogen or methyl group: RJ is the residue of an aliphatic hydrocarbon with 2-20 carbon atoms or its derivative; R, is the residue of a saturated aliphatic hydrocarbon or an aromatic hydrocarbon having 2-20 carbon atoms or its derivative; n is an integer of 1-5.  The preferred glycols of formula (1) include dihydric alcohols of the polyols listed.  Preferred compounds of formula (2) include, for example, aliphatic dicarboxylic acids (succinic, adipic and sebacin) alicyclic dicarboxylic acids (tetrahydrophthalic and 3,6-endomethylentetrahydrophthalic) aromatic acids (phthalic, isophthalate, and tereteryters,), and they will not contain, and they will not contain, and they will not contain, and they will contain aromatic acids (phthalic, isophthalic, and teretetra, and they will be available in the formulas). .  When the distance between acryloxy or methacryloxy groups is too short, a brittle wear-resistant polymer layer is obtained, which is recis and azo compounds).  These include, for example, azobisisobutyronitrile, azobisdimethylvaleronitrile, azobiscyclohexanonitrile, benzene peroxide, lauryl peroxide, peroxide 2, dichlorobenzoyl, isopropyl peroxydicarbonate, isobutyl peroxide and acetyl cyclohydroxycogloxycogloxycate.  Red-catalysts (a combination of peroxide and amine) can also be used.  If necessary, additives can be added to the monomer, for example, stabilizers, flame retardants, plasticizers, molecular weight regulating agents, fillers, dyes and pigments. Both polymerization stages can be carried out periodically or continuously to obtain a casting product. .  It is also possible to produce one of the stages of the half-layer of the surface layer or the molding of the product continuously, and the other - periodically.  Example 1  100 weight. h  trimethylol ethane triacrylate were mixed with 1 wt.  h  ethyl ester of benzoin and deposited on the surface of hardened glass plate, having an area of about 1020 X 1170 mm and a thickness of 10 mm.  The applied layer is covered with a polypropylene film, 0.02 mm thick, and the film is stretched in the longitudinal and transverse direction.  The polypropylene film is pressed by the roller so that there are no air bubbles between the film and the glass and the thickness of the applied layer is about 0.02 mm.  The applied layer was subjected to the first polymerization under the conditions indicated in Table.  one.  After peeling off the polypropylene film, the applied layer was irradiated for 30 min by a high-pressure mercury lamp and cured to a gel content.  The prepared two glass plates are placed opposite each other, covered with layers of polytrimethylol ethane triacrylate, and the space between the plates is compacted with a soft polyvinyl chloride gasket along the periphery of the glass plates and filled with a syrup of partially polymerized methyl methacrylate, containing 0.051 azobisisobutyronitrile-iso-isolite.  9 Interval between plates 3 mm.  Thereafter, the polymerization cell is heated at 60 ° C for 6 hours and then for 2 hours at 120 ° C to complete the polymerization.  Upon cooling, the methyl methacrylate plate is released from the glass plates.  The layers of polytrimethyloltriacrylate obtained in experiment 1 (Table.  1) are separated from glass plates, t. e.  they firmly stick to the cast methyl methacrylate plate.  This plate has good surfaces, free from bumps and optical distortion.  Cast Methyl Methacrylate Plates of Experiments 2 and 3 have parts of the surface on which a cured polytrimethylol triacrylate layer is absent.  Cast plates are difficult to separate from glass plates.  When the polymer layer was polymerized with a high pressure mercury lamp to a gel content of less than 90%, a product with much worse wear resistance and optically distorted surfaces was obtained.  Example 2  Carried out as in Example 1, except that a mixture of 60 wt.  h  1,6-hexanediol diacryl, kQ weight.  h  pentaerythritol tetoacrylate, 1.5 parts of benzoyl isopropyl ester and 0.01 parts of tinuvin P (trade name 2- (2-hydroxy-5 methylphenyl) -benzotriazole from Ciba-Geigy), ultraviolet absorber as a material for the polymer layer and for the coating used polyester film with a thickness of 0.012 mm.  The thickness of the polymer layer was approximately 0.015 mm.  The results are shown in Table.  2  The polymer layer of the experiment was irradiated with a high-pressure mercury lamp for 24 seconds in the absence of a covering film, and further polymerized to a gel content of 96%.  A plate was obtained with good surfaces free from bumps and optical distortion.  Examples  The procedure is carried out analogously to example 1.  Conditions are listed in Table.  3P e m 7.  Analogously to example 1, the coating layer of trimethylolano triacrylate is subjected to the first polymerization stage, and the period tends to separate from the surface of the mold before casting and the resulting product tends to crack on the surface.  When the distance between the acryloxy or meth acryloxy groups is large, the resulting wear layer has a good corrosion resistance but poor wear resistance and solvent resistance.  Therefore, the polymerized material must be chosen so that the average distance between the acryloxy and the s- or methacryloxy groups is moderate, depending on the polymerization conditions, the size of the molded product, the desired balance of wear resistance and processability of the polymer product.  A compound containing acryloxy groups usually preferably contains methacryloxy groups, since in this case the compound has a lower polymerization and conversion rate and its polymer is somewhat more fragile.  In addition, the surface layer obtained from the latter compound is prone to the formation of cracks, although to a lesser extent, and has worse weather resistance.  The copolymerization monomers that can be used in addition to the acryloxy or methacryloxy compound are monoethylenically unsaturated compounds (acrylic acid or its ester, methacrylic acid or its ester, acryloniryl, methacrylonitrile, and styrene.  These curable polymer monomers are used to reduce the viscosity of the polymerising material when it is highly viscous, to dissolve it when it is solid, and to impart the desired physical properties of the polymer to be obtained.  The polymerizable material can be polymerized, for example, by heating a reaction mixture containing a thermally decomposing initiator, or by irradiating a mixture containing a photosensitizer or gamma rays or other ionizing radiation with ultraviolet rays.  Thermally decomposing polymerization initiators include known free radical polymerization initiators, for example, oil soluble azo compound peroxides.  Photosensitizers are preferred that are capable of activating the Polymerizing material at a wavelength of 000 A and they usually include carbonyl compounds.  Preferred initiators exhibit increased free radical polymerization activity and include, for example, azobisisobutyronitrile, benzoyl peroxide, lauryl peroxide and benzoin and its alkyl ether, with an alkyl group having no more than carbon atoms.  These initiators can be used alone or in combination.  The amount of initiator is not more than 5%, more preferably not more than 3% and more preferably not more than 2%, calculated on the weight of the polymerizing material.  When an initiator is used that has a very weak radical polymerization activity, the resulting polymer has poor wear resistance due to the plasticizing effect of the unused initiator or its residue, or it is difficult to achieve the desired degree of polymerization.  Fluorescent, mercury, arc and xenon lamps can be used as a source of ultraviolet radiation.  The monomers used to make polymeric molded products include, for example, methacrylic acid lower alkyl ethers (methyl methacrylate, styrene, acrylonitrile, and methacrylonitrile).  These monomers can be used individually or in mixture with each other or with other copolymerizable and molded monomers or with partially polymerized products.  Such comonomers include, for example, acrylic and methacrylic acids.  The molded article of the invention may also be obtained from unsaturated polyester resins obtained by condensation, for example, phthalic or maleic acid and ethylene glycol or propylene glycol.  Most preferred is methyl methacrylate, a monomer mixture containing at least 50 methyl weight methacrylate, and a partially polymerized product.  As a polymerization initiator for the monomer, known free radical initiators can usually be used (oil-soluble ultraviolet and ultraviolet irradiation lasts 9 seconds.  In the resulting layer of trimethylo-butane triacrylate, the gel content is 3%.  The coating layer, after peeling off the polypropylene film for 100 seconds, is irradiated with a high-pressure mercury lamp, whereby the coating layer hardens to a gel content of 98.1.  Using two sheets of glass with an even layer, a methyl methacrylate synthetic plate is cast.  The layers of polytrimethylleanate triacrilate completely separated from the glass plate, t. e.  they grappled with a synthetic methyl methacrylate molded plate. The synthetic cast metal methacrylate plate has good surfaces, free from bumps and optical distortion.  PRI me R 8.  80 weight.  h  1,6-hexa-dioldiacrylate and 20 wt.  h  methyl methacrylate is mixed with 2.5 weight.  benzoic ethyl ether and all this is placed and applied to one surface of tempered glass sheet as in Example 1.  The covering layer is covered with polyester film- JQ
    which is 0.012 mm thick, when it is stretched, both in the longitudinal and transverse directions. The polyester film is pressed with a roller, so that there are no air bubbles between the film and the glass plate, and the thickness of the coating layer is made approximately 0.001 mm. The coating layer is subjected to a first polymerization under conditions similar to those in Experiment 1 of Example 1, where the period of ultraviolet irradiation is 35 s. The gel content in the polymerized coating layer 921,
    The coating layer, after peeling off the polyester film, is irradiated for 40 seconds with a mercury lamp under high pressure, whereby the coating layer hardens to a gel content of 99 °.
    Using two glass sheets having a polymerized coating layer, a methyl methacrylate synthetic resin plate was cast according to the procedure of Example 1. The plate has the same characteristics as the plate obtained in experiment 1 of example 1.
    the properties of the cast plate obtained in example 1.
    A polymerization method in which the polymerizing material is polymerized by a coated, for example, organic high polymer film has the following advantages. First, polymerization occurs at an increased rate, similarly as in the case where the polymerization is carried out in an inert gas atmosphere. Secondly, the coating film prevents the polymerizing material spreading over the surface of the mold to collect the balls immediately after coating or during polymerization. In view of these two advantages, this polymerization method is particularly suitable for the production of large cast products. Thirdly, the addition of an agent that promotes spreading is not required and therefore there are no defects arising from this addition. Fourthly, even if the polymerizable material contains a volatile compound, there is no difficulty caused by the evaporation of the compound. Example 9. 100 wt. including trimetiolpropane triacrylate mixed with 1 wt. Part of benzoyl ethyl ether is placed and stretched on the surface of tempered glass sheet, as in Example 1. The coating layer is covered with a 0.012 mm thick polypropylene film when the film is stretched in both the longitudinal and transverse directions. The polyester film is pressed by a roller so that there are no air bubbles between the film and the glass plate, and the thickness of the coating layer is adjusted to approximately 0.5 mm. The coating layer is subjected to first polymerization as in Example 1. The gel content in the polymerized coating layer. After covering the polypropylene film for 30 seconds, the coating layer is irradiated with a high-pressure mercury lamp, thereby hardening the coating layer to a gel content of 99%. Using sheets of glass having a polymerized coating layer, analogously to example 1, a plate of methyl methacrylate resin is cast. The plate has properties similar to
    17
    18
    900796 Table 1
    thirty
    79 Chemical lamps
    88.5 1500 mm, located 120
    91 intervals 130 mm.
    98 Three mercury arcs30
    note
    thirty
    60
    120
    108 watts long
    1/10 1/10 female in1 / 3 Irradiation distance 150 mm
    Full-wave lamps kW tew from 1480 mm through the intervals of intervals OQ mm. Irradiation distance 200 mm
    1 / FLPI20EH. BA-37 / AS of Matsumita Electric K,
    2 / L / 3 firms Tokie Shibaura Electrician to.
    3 / Left column - the approximate number of lower polymeric layers separated from glass when the polymer film was peeled off from the polymer layer (total number of samples 100) and the right column indicates the ratio of the separated area to the entire area of the lower polymer layer.
    table 2
    /ten
    1 / 10-1 / 5 More than 1/3
    nineteen
    Tetraethylene glycol dimethyl acrylate
    Bis (ethylene glycol) (talatdimethacrylate
    Benzoin 95 Butyl Ester
    权利要求:
    Claims (2)
    [1]
    Invention Formula
    Method for casting half-molded article by applying a layer of unsaturated monomer compound containing at least two (meth) acryloyloxy groups on the inner surface of the mold or its mixture with other unsaturated compounds of the coating layer with a polymer film to polymerize a layer of monomer compound to form a wear-resistant polymer layer , loading into the form of alkyl methacrylate or its mixture with monoethylenically unsaturated soy900796
    7.0 Table 3
    36
    80
    0.025 20 Polyester
    81
    36
    1000,012 30
    1.5 0.007 Polyester
    by polymerizing alkyl methacrylate or a mixture with a monoethylenically unsaturated compound, polymerizing them in the presence of free-radical polymerization initiators, removing the molded product from the mold, characterized in that, in order to improve the durability of the molded product and improve its appearance, the polymerization monomer layer under the action of irradiation in the presence of a photosensitizer to a conversion equal to at least 401, remove the coating polymer film and pro2190079622
    water t depolymerization obtained. US Patent If 299775 i
    product before conversion, at least. 9-252, pub. 1965, 95%.
    Information sources,
    [2]
    2. United States Patent If
    taken into account in the examination of s cl. publish 1970 (prototio)
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    同族专利:
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    DE2422378B2|1979-11-15|
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP4855074A|JPS5653488B2|1974-04-30|1974-04-30|
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