TW201226189A - Methods for producing polarizing laminate film and polarizing plate - Google Patents

Abstract

A method for producing a polarizing laminate film including a base film and a polarizer layer formed on one surface of the base film involves, in the following order: a resin film laminating step of laminating a resin film made of a polyvinyl alcohol resin and having a thickness of 50 μm or less onto one surface of a base film, to thereby obtain a laminate film; a stretching step of uniaxially stretching the laminate film; and a dyeing step of dyeing the resin film of the uniaxially stretched laminate film with a dichroic dye, to thereby form a polarizer layer. The present invention can provide a method for producing a polarizing laminate film having a thin polarizer layer without giving rise to the problem that the ends of the base film are folded inside.

Description

201226189 VI. Description of the Invention: [Technical Field] The present invention relates to a polarizing laminated film and a method of producing the polarizing plate. [Prior Art] A polarizing plate is widely used as a polarizing supply element or the like in a display device such as a liquid crystal display device. Conventionally, a polarizing element layer containing a polyvinyl alcohol-based resin and a protective film such as cellulose triacetate are used as the polarizing plate. In the polarizing element layer (polarizing film), high optical performance is required, and in recent years, thin-walled weight reduction has been demanded in the development of mobile devices such as notebook personal computers or mobile phones for liquid crystal display devices. As an example of the method for producing a polarizing plate, it is known that a film containing a polyvinyl alcohol-based resin is separately stretched or stretched while being subjected to a dyeing treatment or a crosslinking treatment to form a polarizing film, and laminated on a protective film. A method of manufacturing a polarizing plate by this (for example, refer to JPH11-49878-A). As another example of the method for producing a polarizing plate, a method in which a solution containing a polyvinyl alcohol-based resin is applied to a surface of a base film to form a resin layer, and a laminated film including a base film and a resin layer is stretched is proposed. Then, dyeing is performed, and a polarizing element layer is formed from a resin layer, and a polarizing laminated film having a polarizing element layer is obtained (for example, 'refer to jP2000_33829_a). A method in which a polarizing film is directly used as a polarizing plate or a protective film is bonded to the film, and a base film is peeled off is used as a polarizing plate. As another example of the method for producing a polarizing plate, it is proposed to form a laminated film by co-extruding a resin for a protective film and a polyvinyl alcohol-based resin, and extending the laminated film, followed by dyeing, thereby obtaining a polarizing element layer and A method of protecting a polarizing plate of a film of 16018.doc 201226189 (for example, refer to jP2〇〇9_25821-A). However, in the method of producing a polarizing film by separately stretching, dyeing, and cross-linking a film containing a polyvinyl alcohol-based resin, it is easy to cause cracks or wrinkles, etc., so that it is difficult to handle a thin film of 50 μm or less, which is difficult to realize. The polarizing film is thinned. In the method of applying a solution containing a polyvinyl alcohol-based resin to a surface of a base film and providing a resin layer, the resin layer is likely to wrinkle due to drying shrinkage of the solution containing the polyvinyl alcohol-based resin, and as a result, a base may be formed. When the both ends of the material film are warped toward the resin layer side, if the base film having the resin layer is continuously passed through in this state, the end of the base film in the drying furnace or the outlet of the drying furnace may be caused. Defects such as folding. In the method of producing a laminated film by co-extruding a resin for a protective film and a polyvinyl alcohol-based resin, the polyvinyl alcohol-based resin is usually melted and extruded together with a solvent, so that it is caused by drying shrinkage as described above. The case where the end portion of the base film is folded or the like is defective. Accordingly, it is an object of the present invention to provide a polarizing laminate film and a polarizing plate which have a thin polarizing element layer without causing a defect in the end 4 of the base film. SUMMARY OF THE INVENTION The present invention encompasses the following. [1] A method for producing a polarizing laminated film, comprising: a method of producing a polarizing laminated film comprising a base film and a polarizing element layer formed on one surface of the base film, and sequentially comprising the steps of: A resin film containing a polyvinyl alcohol-based resin having a thickness of 50 μm or less is attached to 160018.doc 201226189. a resin film bonding step of obtaining a laminated film on a substrate film; an extending step of uniaxially stretching the laminated film; and dyeing the resin film of the uniaxially stretched laminated film with a dichroic dye to form a polarized light The dyeing step of the component layer. [2] The method for producing a polarizing laminated film particularly contained in [1], wherein the resin film is bonded to the substrate film via an adhesive layer or an adhesive layer in the upper slab bonding step On one side. [3] The method for producing a polarizing laminate film according to [1] or [2] wherein, in the resin film bonding step, the thickness of the resin film is 15 μm. [4] The method for producing a polarizing laminated film according to any one of [1] to [3] wherein the resin film used in the resin film bonding step is a manufacturing method comprising the following steps in sequence A resin film to be produced: a resin layer forming step of forming a resin layer containing a polyethylene glycol resin on a support; a first drying step of drying the resin layer; and peeling the resin layer from the support to obtain the resin a resin layer separation step of the layer; and a second drying step of drying the resin layer at a drying temperature higher than the temperature in the first drying step. [5] A method for producing a polarizing plate, which is a method for producing a polarizing plate comprising a polarizing element layer and a protective film formed on one surface of the polarizing element layer, and is manufactured by the method described in [1] After the polarizing laminated film, 160018.doc 201226189 includes the following steps: a protective film attached to the surface of the polarizing layer on the side opposite to the surface on the side of the substrate film in the polarizing layer film And a step of peeling off the base film which peels the base film from the polarizing laminated film. According to the present invention, a thin polarizing element layer can be produced without folding the end portion of the base film in the manufacturing step. The polarizing laminated film and the polarizing plate. [Embodiment] Hereinafter, a preferred embodiment of a method for producing a polarizing laminate film of the present invention and a method for producing a polarizing plate will be described in detail with reference to the drawings. [Manufacturing method of polarizing laminated film] Fig. 1 is a flow chart showing an embodiment of a method for producing a polarizing laminated film of the present invention. The polarizing laminate film produced in the present embodiment comprises a base film and a polarizing element layer formed on one surface of the base film. The method for producing a polarizing laminated film of the present embodiment is generally carried out in the following steps: a resin film bonding step in which a resin film containing a polyethylene resin is bonded to one surface of a base film to obtain a laminated film (S10) a step of stretching the laminated film uniaxially (S20); and a dyeing step of forming a polarizing element layer by dyeing the resin film of the laminated film with a dichroic dye (§3). In the present specification, a laminated body in which a resin film containing a polyvinyl alcohol-based resin (hereinafter also referred to as a "polyvinyl alcohol-based resin film") is bonded to one surface of a base film is referred to as a "laminated film". A polyvinyl alcohol-based resin film having a function as a polarizing element is referred to as a "polarizing element layer", and a laminated body having a polarizing element layer on one of the base film 16018.doc • 6 - 201226189 is referred to as "polarizing property". Laminated film." Further, a laminate having a protective film on one surface of the polarizing element layer is referred to as a "polarizing plate". According to the above production method, a polarizing laminated film having a polarizing element layer having a thickness of 25 μm or less having sufficient polarizing performance can be obtained on the substrate film. The thickness of the polarizing element layer of the polarizing laminated film obtained by the above production method is preferably 25 μη or less, more preferably 20 μηη or less. The polarizing laminated film can be used as an intermediate product for transferring a polarizing element layer onto a protective film as described below. Further, when the base film has a function as a protective film, the polarizing laminated film can also be used. Used directly as a polarizing plate. [Manufacturing Method of Polarizing Plate] Fig. 2 is a flow chart showing an embodiment of a method for producing a polarizing plate of the present invention. The polarizing plate produced in the present embodiment includes a polarizing element layer and a protective film formed on one surface of the polarizing element layer. In the method for producing a polarizing plate of the present embodiment, the polyvinyl alcohol-based resin film is usually attached in the following steps. a resin film bonding step of obtaining a laminated film on the surface of the substrate film (S1〇) 'Extension step of singulating the laminated film uniaxially (S20); and a polyethylene material having a two-color steep coloring matter a dyeing step of forming a polarizing element layer by dyeing the resin film (S3〇); and after obtaining the polarizing laminated film, the steps of the polarizing layer and the substrate (4) in the polarizing laminated film are generally sequentially included The bonding step (S40) of bonding the protective film to the opposite surface of the surface (4); and the peeling step (S50) of peeling off the substrate film from the optically laminated film. According to the above-described method for producing k, a polarizing plate having a polarizing element layer having a polarizing performance of, for example, a thickness of 25 μm or less having a sufficient 1600 il.doc 201226189 polarizing property can be obtained as a polarizing element layer of a polarizing plate obtained by the above manufacturing method. The thickness is preferably 25 μηη or less, more preferably 2 μm μη or less. The polarizing plate can be used, for example, by a pressure-sensitive adhesive and bonded to another optical film or liquid crystal cell or the like. Hereinafter, each step of S10 to S50 in Figs. 1 and 2 will be described in detail. Furthermore, the steps of S10 to S30 of FIGS. 1 and 2 are the same steps. <Resin film bonding step (s 1 〇)> A polyvinyl alcohol-based resin film is bonded to one surface of the base film. The bonding method of the base film and the polyethylene resin film is not particularly limited as long as it does not peel off even after the subsequent stretching step (S20) and the dyeing step (83〇). For example, an adhesive layer or an adhesive layer is formed on the bonding surface of the polyvinyl alcohol-based resin film and/or the base film, and the two are bonded via an adhesive layer or an adhesive layer. (Polyvinyl alcohol-based resin film The thickness of the polyvinyl alcohol-based resin film used in the resin film bonding step is set to 5 μm or less. The polyvinyl alcohol-based resin film is formed into a polarizing element layer through a subsequent stretching step and a dyeing step, and the polyvinyl alcohol-based resin film in the resin film bonding step (S10) is a polyvinyl alcohol-based resin film before stretching. When the thickness exceeds 50 μm, the stretching step and the dyeing step can be carried out even if it is not bonded to the substrate film as shown in the present invention, so that the advantages of the present invention are small. Further, when the thickness of the polyvinyl alcohol-based resin film exceeds 5 μm, there is a case where it is difficult to form the thickness of the polarizing element layer to a film of 25 μm or less. Further, the thickness of the polyvinyl alcohol-based resin film (before stretching) is 160018.doc 201226189 is preferably 10 μπ or more, more preferably 1 w , , , , μηη w. When the thickness of the polyvinyl alcohol-based resin film is less than 10 μm, it is easy to obtain a polyvinyl alcohol-based resin film as early as possible. The thickness of the polyvinyl alcohol-based resin film is preferably from 15 to 45. A polyvinyl alcohol-based resin which forms a polyvinyl alcohol-based resin film can be used as the resin obtained by forming a polyacetate resin. The polyvinyl acetate-based resin is exemplified by a copolymer of vinyl acetate and another monomer which can be copolymerized, in addition to polyacetate as a homopolymer of vinyl acetate S. Examples of the other monomer copolymerizable with vinyl acetate may be an unsaturated carboxylic acid, an olefin, a vinyl ether, an unsaturated sulfonic acid, or an acrylamide having an ammonium group. The polyvinyl alcohol-based resin is preferably a completely saponified product. The range of the degree of tempering is preferably from 80 mol% to 100 mol%, more preferably 9 〇 mol% to 1 〇〇 ❶ ’ ’ and then preferably from 94 mol% to 100 mol. / Range of 〇. If the degree of saponification is less than 80 mol%, there is a problem that the water resistance and the moist heat resistance after the formation of the polarizing element layer are remarkably poor. The degree of saponification referred to herein means the ratio of the acetic acid group contained in the polyvinyl acetate-based resin which is a raw material of the polyvinyl alcohol-based resin to the hydroxyl group by the saponification step in terms of the unit ratio (% by mole). Those are the values defined by the following formula. It can be obtained by the method specified in JIS Κ 6726 (1994). Saponification degree (% by mole) = (number of hydroxyl groups) + (number of hydroxyl groups + number of acetate groups) xl 〇〇 indicates that the higher the degree of saponification, the higher the proportion of hydroxyl groups, that is, the ratio of the acetic acid groups which inhibit crystallization is higher. Low" and 'polyethylene glycol resin can also be a part of the modified modified polyethylene 1600l8.doc -9· 201226189 alcohol. For example, a polyvinyl alcohol-based resin may be exemplified by sulfuric acid such as ethylene or acryl, unsaturated unsaturated acid such as acrylic acid, methyl acrylic acid or crotonic acid, or alkyl vinegar of unsaturated tarenic acid. And so on. The proportion of the modification is preferably less than 30% by mole, more preferably less than 1% by mole. In the case where the modification is more than the % of the mole, it becomes difficult to adsorb the dichroic dye, resulting in defects such as low polarization performance. The average degree of polymerization of the polyvinyl alcohol-based resin is not particularly limited, but is preferably 100 10000 Å, more preferably i is 8 or less, and particularly preferably 2 to 5 Å. The average degree of polymerization referred to herein is also a value obtained by a method defined in accordance with JIS K 6726 (1994). Examples of the polyvinyl alcohol-based resin having such a property include PVA124 manufactured by KUraray Co., Ltd. (saponification degree: 98 〇 to 99 〇 Mo Er (6), PVA 117 (saponification degree: 98.0 to 99. 〇 mol%) , pVA624 (saponification degree: 95.0 to 96.0 mol%) pVA617 (internationalization degree: 94 5 to 95 5 m.; for example, the Japanese synthetic chemical industry (stock) manufactured ΑΗ · 26 (saponification degree: 97.0~ 98.8 mol%), ΑΗ_22 (degree of deuteration: 97 5~98 5 mol, ΝΗ-18 (saponification degree: 98.0~99.0 mol%), and ν·3〇〇 (saponification degree: 98.0~99.0 mol %); for example, JACAN VAM & POVAL (share) JC-33 (saponification degree: 99.0 mol% or more), JM_33 (saponification degree: 93.5 to 95.5 mol%), JM-26 (saponification degree: 95.5~97.5 mol%), 1?-45 (saponification degree: 86.5~89.5 mol%), scare-17 (saponification degree: 98.0~99.0 mol%), JF-17L (saponification degree: 98.〇~ 99 〇mol%), and JF-20 (saponification degree: 98.0 to 99.0% by mole), etc., which can be preferably used for the formation of the polyvinyl alcohol-based resin film of the present invention. • 10·160018.doc

S 201226189 The polyethylene glycol-based resin as described above is formed into a film to form a polyethyl alcohol-based resin. The method of dispersing the polyvinyl alcohol-based resin is not particularly limited. For example, hydrazine can be exemplified by a method in which a polyethylene glycol-based resin solution is applied onto a support and dried, or a polyether or a resin containing water is melt-kneaded. Further, a melt-squeezing method in which M is extruded on the support (4) by an extruder, and a gel film formation method in which a polyvinyl alcohol-based resin aqueous solution is sprayed into a poor solvent (low-solubility solvent) is used. Among these, the aspect of the membrane of the moon can be obtained, preferably the prayer method or the melt extrusion method. In the following, a preferred embodiment of the method for producing a polyethylene glycol (tetra) lipid film is described. Fig. 3 is a flow chart showing a method for producing a polyvinyl alcohol-based resin film of the present embodiment. In the present embodiment, the following steps are generally carried out: a resin layer forming step of forming a resin layer containing a polyvinyl alcohol-based resin on a support (S110); & drying the resin layer by a drying step (8) 20 a resin layer separating step of removing the resin layer from the support to obtain the resin layer (S130); and drying the resin layer at a temperature higher than the temperature in the first drying step (sl4〇 For example, a release film, a non-ferrous steel strip, and a cooling roll are exemplified as a method of forming a resin layer in a resin layer forming step (S110) on a support. In the above solvent casting method or melt extrusion method, for example, it is preferred to dissolve the powder of the polyvinyl alcohol resin in a good solvent (highly soluble solvent) and to dissolve the obtained polyethylene resin. a method of forming a coating on a surface of a support and evaporating the solvent and drying it. By forming a polyethylene resin layer in this manner, the thickness of the polyethylene is 10 to 50 μm. Dilute alcohol resin layer. 160018.doc 201226 189 As a method of applying a polyvinyl alcohol-based resin solution to a support, a wire bar coating method, a reverse coating method, a gravure printing coating method, a die coating method, or a die coating method can be appropriately selected. A well-known method such as a comma coating method, a lip coating method, a spin coating method, a screen coating method, a spray coating method, a dipping method, or a spray method. The polyvinyl alcohol-based resin solution can be obtained, for example, by dissolving a polyvinyl alcohol-based resin in water to a temperature of 80 to 90%. The concentration of the solid content of the polyethylene glycol-based resin is preferably 6 wt. When the concentration of the solid content component is less than 6 to %, the viscosity becomes too low, and the fluidity at the time of formation of the resin layer becomes too high, and it becomes difficult to obtain a uniform film. On the other hand, when the solid content exceeds 50% by weight, the viscosity becomes too high, and the fluidity at the time of formation of the resin layer becomes low, so that it becomes difficult to form a film. A plasticizer can be added to the polyvinyl alcohol-based resin solution. Preferably, a polyhydric alcohol is used, and examples thereof include ethylene glycol, glycerin, propylene glycol, diethylene glycol, and tri a diol, a tetraethylene glycol, a trihydrocarbyl propane, etc. A plurality of them may be combined. It is particularly preferable to use ethylene glycol or glycerin, and an anti-caking agent such as a surfactant may be used in combination, if necessary. After the resin layer forming step (S110), in the second drying step (Si2〇), the resin layer formed on the support is dried at a low temperature, usually at a drying temperature of (10) or less, to the extent that it can be peeled off from the support. The degree of peeling from the support means that the coating liquid is in a solid state to some extent and can be peeled off as a film. Usually, it is dried until the water content reaches %, and the entire film can be stably peeled off. Dry 16018.doc 201226189 Drying up to 20 wt% or less makes it easier to peel off, so it is preferred. The water content referred to herein means the amount of water determined by the dry weight method, and can be obtained by the following method. • After the peeled PVA film was allowed to stand at room temperature (about 25 〇 c 55% RH) for 3 Torr or more, the film weight was measured. • Thereafter, it was dried at 105 C for 60 minutes and taken out, and then left for a few minutes until the film temperature returned to normal temperature. • After standing for a few minutes, the weight of the film was measured again. • Substituting the value obtained into the following formula. Moisture content = (weight before drying - weight after drying) / weight before drying X1 00 (wt / wt%) As a specific method of drying the resin layer formed on the support until the extent of peeling from the holder For example, in the actual production, it is preferred to confirm the drying conditions in the peelable state in advance by preliminary experiments, and to carry out under the conditions. For example, it is preferably dried at a temperature ranging from 4 ° C to 60 ° C. 1 to 30 minutes, more preferably dried at 5 ° C for about 3 to 20 minutes. In the first drying step (S120), by drying at a low temperature, or drying the tree layer until it can be peeled off from the support. Incomplete drying, the drying shrinkage in the resin layer is not easily generated, and the curling of the end portion in the support can be prevented. In the resin layer separating step (S130), the resin layer to be dried in the second drying step The resin layer is obtained by peeling off the support, and the resin layer peeled off from the support is dried in the A 2 drying step (S140). In the drying step (S140), the resin layer is sufficiently dried. Therefore, at 16018. Doc -13· 201226189 The first drying step phase Drying is carried out at a high temperature drying temperature. The high temperature referred to herein is usually 150 ° C or less, preferably 120 ° C or less, more preferably 1 ° C or less, and preferably 60 ec or more. Preferably, the drying method includes a method of blowing hot air, a method of contacting with a heat roller, a method of heating by an infrared heater (infrared heater), and the like. Further, the drying temperature mentioned in the first drying step and the second drying step refers to a method of blowing hot air or an environment in a drying furnace when a drying apparatus such as an IR heater is provided with a drying furnace. The temperature is the surface temperature of the hot roll when the contact type drying apparatus such as a heat roll is used. The polyvinyl alcohol type resin film is produced through the above steps. The polyvinyl alcohol produced by the method of the present embodiment The resin film is excellent in curling. (Base film) As the resin used for the base film, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, and elongation is used. An appropriate resin can be selected according to the glass transition temperature (Tg) or the melting temperature (Tm). The base film preferably uses a polyvinyl alcohol-based resin film which is suitable for laminating thereon. The extension of the temperature range is as follows. Specific examples of the thermoplastic resin include a polyolefin resin, a polyester resin, a cyclic polyolefin resin (northene resin), and (meth)acrylic acid. Resin, cellulose ester resin, polycarbonate resin, polyvinyl alcohol resin, vinyl acetate resin, polyarylate resin, polystyrene 16018.doc •14· 201226189 resin, polyether mill A resin, a polysulfone-based resin, a polyamine-based resin, a polyimide-based resin, and a mixture or a copolymer thereof. The base film may be a film containing only the above-mentioned resin, or may be a film obtained by blending two or more kinds of resins. The base film may be a single layer film or a multilayer film. As the polyolefin resin, polyethylene or polypropylene may be used, and it is preferable to extend it at a constant rate. Further, a propylene-ethylene copolymer obtained by copolymerizing ethylene and propylene or the like can also be used. The copolymerization may be another type of monomer, and examples of other types of monomers copolymerizable with propylene include ethylene and an α-olefin. As the α-olefin, an α-olefin having a carbon number of 4 or more is preferable, and a carbon number of 4 to 1 〇 ia olefin is more preferable. Specific examples of the carbon number of 4 to 1 fluorene include: 1 _ butyl sulphate, 丨 戊 pentene, 丨 · hexene, 1 · heptane, 1 · octene, 1-decene and other linear monoolefins a branched monoolefin such as 3-methylbutene, 3-methyl-1-cyclopentene or 4-methyl-1-pentene; ethylene cyclohexane or the like. The copolymer of propylene and a monomer copolymerizable therewith may be a random copolymer, or may be a block copolymer. The content of the constituent unit derived from the other monomer in the copolymer may be determined by "polymer analysis". The method described in page 616 of the Handbook (published in the Kiiiyaya Bookstore, 1995) was determined by infrared (IR) spectrometry. In the above, as the propylene-based resin constituting the propylene-based resin film, a homopolymer of propylene, a propylene-ethylene random copolymer, a propylene-butene random copolymer, and a propylene-ethylene-1-random copolymer are preferably used. Things. Further, the stereoregularity of the propylene-based resin constituting the propylene-based resin film is preferably substantially isotactic or syndiotactic. The propylene-based resin film containing a propylene-based resin having a substantially regular or syndiotactic 1600I8.doc -15-201226189 is relatively excellent in handleability and excellent in mechanical strength in a high-temperature environment. The polyester resin is a polymer having an ester bond, and is mainly a polycondensate of a polyvalent carboxylic acid and a polyterpene alcohol. As a polyvalent carboxylic acid, a divalent carboxylic acid i is mainly used, for example, isophthalic acid, and stupid Dicarboxylic acid, dimethyl terephthalate, dimethyl naphthalate, and the like. Further, the polyol to be used is mainly one of a divalent alcohol, and examples thereof include propylene glycol, butanediol, neopentyl glycol, and cyclohexane dimethanol. Specific examples of the resin include: polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene naphthalate, and polypair. Propylene dicarboxylate, propylene terephthalate (P〇lytnmethylene naphthalate), poly(p-phenylene terephthalate), poly(naphthalene dicarboxylate), and the like. It is also preferred to use such blended resins or copolymers. As the cyclic polyolefin resin, a norbornene-based resin is preferably used. The cyclic polyolefin-based resin is a general term for a resin which is polymerized by using a cyclic olefin as a polymerization unit, and examples thereof include resins described in jph〇1_24〇517 a, JPH〇3_14882 A, and JPH03-122137-A. Specific examples thereof include a ring-opening (co)polymer of a cyclic olefin, an addition polymer of a cyclic olefin, a copolymer of a cyclic olefin and an α-olefin such as ethylene or propylene (representatively random) a copolymer), a graft polymer obtained by modifying the unsaturated carboxylic acid or a derivative thereof, and the like, and the like. Specific examples of the cyclic olefins include a hydrazine-based monomer. Various products are sold as the cyclic polyolefin resin. Specific examples include Topas (registered trademark) (manufactured by Tic〇na Co., Ltd.) and Art〇ne (registered 160018.doc)

S -16- 201226189 Trademark) (JSR (share) manufacturing), Zeonor (ZEONOR) (registered trademark) (made in 曰本ΖΕΟΝ), Ze〇nex (ZEONEX) (registered trademark) (曰本ΖΕΟΝ) Manufactured, Apel (registered trademark) (manufactured by Mitsui Chemicals Co., Ltd.), etc. Any suitable (sub)acrylic resin can be used as the (meth)acrylic resin. For example, poly(meth)acrylate, a methyl methacrylate-(meth)acrylic copolymer, a methyl methacrylate-(meth)acrylate copolymer, a mercapto group, such as polymethyl methacrylate Methyl acrylate-acrylic acid vinegar-(meth)acrylic acid copolymer, methyl (meth) acrylate-styrene copolymer (MS resin, etc.), polymer having an alicyclic hydrocarbon group (for example, methacrylic acid) Methyl ester-cyclohexyl methacrylate copolymer, methyl methacrylate-(meth)acrylic acid decyl ester copolymer, etc.). Preferably, a poly(meth)acrylic acid ci-6 alkyl ester such as poly(methyl) acrylate is used. As the (meth)acrylic resin, a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 1% by weight, preferably 7 to 1% by weight) is more preferably used. . The cellulose ester resin is an ester of cellulose and a fatty acid. Specific examples of the cellulose ester-based resin include cellulose acetate triacetate, cellulose diacetate, cellulose dipropionate, and cellulose dipropionate. Further, those obtained by modifying the copolymer or the group-substituted group with a substituent of another type or the like may be mentioned. Among these, cellulose triacetate vinegar is preferred. Triacetin cellulose vinegar is sold in a variety of products and is also advantageous in terms of ease of accessibility or cost. As an example of the sales of cellulose triacetate δ, 3, we can list (10) (registered trademark) and delete (postal stock) manufacturing, Fu (registered trademark) TD Qing (four) old claw (share) system I60018. Doc 201226189 (made), Fujitac (registered trademark) TD80UZ (manufactured by Fuji Film), Fujitac (registered trademark) TD40UZ (manufactured by Fuji Film), KC8UX2M (manufactured by Konica Minolta Opto), KC4UY (Konica)

Minolta Opto (manufacturing) and so on. The polycarbonate resin is an engineering plastic containing a polymer obtained by bonding a monomer unit via a carbonate group, and is a resin having high impact resistance, heat resistance and flame retardancy. Moreover, it is preferably used for optical applications because of its high transparency. A resin called modified polycarbonate which is a modification of the polymer skeleton in order to reduce the photoelastic coefficient in optical use, or a copolymerized polycarbonate which improves the wavelength dependency can be preferably used. Such a carbonate resin is widely sold, and examples thereof include: panlhe (registered trademark) (Teijin Chemical Co., Ltd.), Iupil〇n (registered trademark)

Engineering-Plastic (share)), SD p〇lyca (registered trademark) (sumit_Dow (share)), Calibre (registered trademark) (D〇w Chemicai (share)), and the like. Any suitable additive may be added to the base film in addition to the above thermoplastic resin. As such an additive, for example, a collector, an antioxidant, (iv), a plasticizer, a mold release agent, a ruthenium: a flame retardant, a nucleating agent, an antistatic agent, a pigment, a colorant, and the like. The content of the thermoplastic resin exemplified above in the substrate film is preferably 5 〇 to 8% by weight, more preferably 50 to 99% by weight, and further preferably 6 Å, % by weight, particularly preferably 7 〇 to 97% by weight. %. The reason for this is that when the content of the thermoplastic resin in the base film is less than 5% by weight, the thermoplastic resin inherently has insufficient transparency and the like. The thickness of the substrate film before stretching can be appropriately determined, and is generally preferably 500 μm, more preferably 1 to 300 μm, and more preferably in terms of strength or workability such as 160018.doc 201226189. For 5~2〇〇μΓη 'Specially for 5~15〇μηι. In order to improve the adhesion between the base film and the polyvinyl alcohol-based resin film, the surface of the side to which the polyvinyl alcohol-based resin film is bonded may be subjected to corona treatment, plasma treatment, flame treatment, or the like. Further, in order to improve the adhesion, a thin layer such as an undercoat layer may be formed on the surface of the base film on the side where the polyvinyl alcohol-based resin film is formed. (Undercoat layer) An undercoat layer may be formed on the surface of the base film to which the side of the polyvinyl alcohol-based resin film is bonded. The undercoat layer is not particularly limited as long as it exhibits a certain degree of adhesion to both the base film and the polyvinyl alcohol resin film. For example, a thermoplastic resin excellent in transparency, heat stability, and elongation can be used. Specifically, an acrylic resin or a polyvinyl alcohol-based resin is exemplified, but it is not limited thereto. Among them, a polyethylene resin which is excellent in adhesion is preferably used. Examples of the polyvinyl alcohol-based resin used as the undercoat layer include a polyethylene resin and a derivative thereof. The derivative of the polyvinyl alcohol resin may be an olefin such as ethylene or propylene, or an unsaturated acid such as acrylic acid, methacrylic acid or crotonic acid, in addition to polyacetic acid and ethylene. A carboxylic acid, an alkyl ester of an unsaturated carboxylic acid, acrylamide or the like is modified. Among the above polyethylene-based resin materials, a polyethylene resin is preferably used. A crosslinking agent may also be added to the above thermoplastic resin in order to increase the strength of the undercoat layer. As the crosslinking agent to be added to the thermoplastic resin, those known from the organic system and the inorganic system 160018.doc -19 to 201226189 can be used. Anyone who chooses a thermoplastic resin that is more suitable for use can be selected. For example, in addition to a low molecular crosslinking agent such as an epoxy crosslinking agent, an isocyanate crosslinking agent, a dialdehyde crosslinking agent, or a metal chelate crosslinking agent, methylolated melamine may also be used. A polymer crosslinking agent such as a resin or a polyamide resin. When a polyvinyl alcohol-based resin is used as the thermoplastic resin, a polyamine solvent epoxy resin, a hydroxylated melamine, a dialdehyde, a metal chelate crosslinking agent or the like is preferably used as a crosslinking agent. The thickness of the undercoat layer is preferably 〇5 to 丨, and further preferably 〇1 to μηη. If it is thinner than 〇.05 μιη, the adhesion between the base film and the polyvinyl alcohol film is lowered. If it is thicker than 1 μΐ, the polarizing plate becomes thick, which is not preferable. (Adhesive layer) The adhesive constituting the adhesive layer is also called a pressure-sensitive adhesive. Usually, an acrylic resin, a styrene resin, a lanthanum resin, or the like is used as a base polymer, and an isocyanate compound or epoxy is added thereto. A composition obtained by crosslinking a compound such as a compound or an aziridine compound. Further, fine particles can be blended in the adhesive to form an adhesive layer exhibiting light scattering properties. The thickness of the adhesive layer is preferably from 1 to 4 pm, and further preferably is applied thinly within the range of characteristics of non-destructive workability and durability, more preferably from 3 to 25 μm. If it is 3 to 25 μm, it has good workability and is also preferable in terms of controlling the dimensional change of the polarizing film. If the adhesive layer is not completed, the adhesiveness is lowered. If it exceeds 4 μm, it becomes easy to cause a problem such as an adhesive overflow or the like, and a method of forming an adhesive layer on the base film or the polyvinyl alcohol-based resin film. No special limitation can be applied to the substrate film surface or the surface of the polyvinyl alcohol resin film. 16018.doc •20-

S 201226189 The cloth contains a solution of each component including the above base polymer, and is dried to form an adhesive layer, and then bonded to a separator or other type of film, or may be formed on the separator after forming an adhesive layer. It is attached and laminated on the surface of the base film or the surface of the polyethylene resin film. X. When an adhesive layer is formed on the surface of the base film or the polyvinyl alcohol resin film, it may be carried out on one side or both sides of the base film surface or the polyvinyl alcohol resin film surface or the adhesive layer as needed. Adhesive treatment, such as corona treatment. (Binder layer) Examples of the adhesive agent constituting the adhesive layer include a polyvinyl alcohol-based resin aqueous solution and a water-based adhesive using an aqueous two-liquid polyurethane latex adhesive. An aqueous solution of a polyvinyl alcohol resin. In the polyvinyl alcohol-based resin used as an adhesive, in addition to the vinyl alcohol homopolymer obtained by saponifying the polyvinyl acetate which is a homopolymer of vinyl acetate, there is a vinyl acetate and a The copolymer of the other monomer copolymerized is subjected to a saponification treatment to obtain a vinyl alcohol-based copolymer, and a modified polyvinyl alcohol-based polymer in which the hydroxyl groups are partially modified. A polyvalent aldehyde, a water-soluble epoxy compound, a melamine-based compound, a cerium oxide compound, a zinc compound or the like may be added to the aqueous binder as an additive. In the case of using such a water-based adhesive, the adhesive layer obtained thereafter is usually much thinner than 1 μm, even though the cross-section is observed by a usual optical microscope. The bonding method of the film using the water-based adhesive is not particularly limited, and the adhesive may be uniformly applied or /ylL on the surface of the base film or the polyvinyl alcohol-based resin film, and the other film may be overlaid on the coating. On the surface of the cloth, the 1600l8.doc -21 - 201226189 is attached by light, and dried. Usually, the adhesive is applied at a temperature of 15 to 40 ° C after the preparation thereof, and the bonding temperature is usually in the range of 15 to 30 ° C. ‘In the case of using a water-based adhesive, it is dried after the film is bonded to remove water contained in the water-based adhesive. The temperature of the drying oven is preferably 30 C to 90 C. If it is less than 3 〇〇c, there is a tendency that the adhesive surface is easily peeled off. When it is 9 (TC or more, the optical performance of the polarizing element or the like may be deteriorated by heat. The drying time may be 1 〇 to 1 〇〇〇 second. After drying, it may be at room temperature or slightly. At a high temperature, for example, it is aged at about 20 to 45 ° C for about 12 to 6 hours, and the temperature at the time of curing is usually set lower than the temperature used for drying. The non-aqueous adhesive agent is used as a photocurable adhesive. For example, a mixture of a photocurable epoxy resin and a photocationic polymerization initiator may be mentioned. As a method of bonding a film with a photocurable adhesive, As a conventionally known method, for example, a cast molding method, a Meyer bar coating method, a gravure coating method, a kama (c_a) coating method, a knife-to-die method, a die coating method, a dip coating method, or the like can be cited. The spraying method is a method in which two films are superposed by applying an adhesive to the adhesive surface of the film. The so-called casting method is to form two films as a coated object in a substantially vertical direction, a substantially horizontal direction, or both. Move in the oblique direction while making the adhesive on it A method of expanding the coating under the surface flow. After applying the adhesive to the surface of the film, the film is pasted by a nip roll or the like, and then it is preferably used to affinity the laminate. In this case, it is also possible to use the metal 160018.doc -22·201226189 s, 'etc. as the material of the roller. Further, it is also preferable to use the laminate between the report and the light And in the case of pressing and spreading, in this case, the / etc. may be the same material or different materials. The thickness of the adhesive layer after lamination or hardening using the above-mentioned smooth roll or the like It is preferably 5 (four) or less and 0.01 μϊη or more. _ In order to improve the adhesion, surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame treatment, and chemical treatment may be appropriately performed on the subsequent surface of the film. The saponification treatment may be a method of immersing in an alkaline aqueous solution such as sodium hydroxide or potassium hydroxide. When a photocurable resin is used as an adhesive, the activity is irradiated after the laminated film. The light-curing adhesive is cured by the amount of radiation. The light source of the active energy ray is not particularly limited, and is preferably an active energy ray having a light-emitting distribution at a wavelength of 4 〇〇 nm or less. Specifically, it is preferably used: a low-pressure mercury lamp, Pressure mercury lamp, high pressure mercury lamp, ultra high pressure mercury lamp, chemical lamp, black light lamp, microwave excited mercury lamp, metal toothed lamp, etc. The light irradiation intensity of the photocurable adhesive is appropriately determined depending on the composition of the photocurable adhesive, and is not determined. In particular, it is preferred that the irradiation intensity in the wavelength region effective for activation of the polymerization initiator is 0.1 to 6000 mW/cm 2 . When the irradiation intensity is 0.1 mW/cm 2 or more, the reaction time does not become excessive. When the temperature is 6,000 mW/cm2 or less, the yellowing of the epoxy resin or the deterioration of the polarizing film due to the heat generated by the heat of the light source and the hardening of the photocurable adhesive is small. The light irradiation time of the photocurable adhesive is not particularly limited as long as it is used according to the photocurable adhesive which is cured. 1600l8.doc -23-201226189 is preferably expressed by the product of the above irradiation intensity and irradiation time. The integrated light amount is set to be 10 to 10000 mj/cm 2 . When the integrated light amount of the photocurable adhesive is 10 mj/cm 2 or more, a sufficient amount of the active material derived from the polymerization initiator can be generated to more accurately perform the hardening reaction at 10,000 mj/cm 2 or less. In the case, the irradiation time does not become too long' to maintain good productivity. Further, the thickness of the adhesive layer after the active energy ray irradiation is usually about 0.001 to 5 μm, preferably 〇 〇 or more and 2 μπ or less, more preferably 〇·〇1 μηι or more and i μηη or less. When the photocuring on the substrate film or the polyethylene resin film is hardened by irradiation with active energy rays, the adhesion, hue, and transparency of the film are preferred. Wait for 'hardening' under the condition that the functions of the polarizing plate after all the steps are not lowered. <Extension Step (S20)> Here, the laminated film including the base film and the polyethylene resin film is stretched. Preferably, the bicycle extension is performed at a stretching ratio of more than 5 times and 17 times or less. Further, it is preferable to carry out the shaft extension at a stretching ratio of more than 5 times and 8 times or less. When the stretching ratio is 5 or less, the polyvinyl alcohol-based resin is sufficiently aligned. As a result, the polarizing shoulder of the polarizing element layer may not be sufficiently high. On the other hand, when the stretching ratio exceeds Η times, the delamination of the laminated film at the time of elongation is likely to occur, so that the workability and workability in the subsequent steps are lowered. The extension treatment in the extension step (4) may be carried out in multiple stages without being limited to the extension in the -stage. In the second stage, it is preferable to extend the treatment at a stretching ratio of more than 5 times in all stages of the processing. And 160018.doc

In the extension step (10) of the present invention, the length extension = row = extension treatment or the lateral extension extending in the width direction may be carried out as a longitudinal extension method, and a method of extending between rolls may be mentioned. As the lateral extension method, a tenter stretching method or the like can be cited. <Staining Step (S30)> Navy Blue t ~ A Scarlet Super These are here to dye the resin layer formed by the dichroic dye. As the dichroic dye, for example, iodine or an organic dye can be mentioned. As an organic dye: For example, it can be used: red BR, red LR, red R, pink lb, jade red BL, purple red GS, sky blue LG, lemon yellow blue, purple, purple purple black black 2:, GSP κ Color 3〇, yellow R, dial & LR, orange 3r, red gl, 侃, Congo red, bright purple Β, super blue g, super blue GL' orange GL, direct sky blue, direct fast drying orange s, Quick dry black and so on. The dichroic substance may be used alone or in combination of two or more. The wood color step is carried out, for example, by immersing the entire stretched film in an aqueous solution (dyeing solution) containing a dichroic dye. A solution obtained by dissolving the above dichroic dye in a solvent can be used as the dyeing solution. As a solvent for the dye solution, it is generally ancient. The water may be further added to have a compatible organic solvent with water. The concentration of the dichroic dye is preferably 0.CU~Η)% by weight, more preferably 0.G2 to 7% by weight, particularly preferably gg25~ 5 wt%. In the case of use as a ▲ & pigment, the dyeing effect can be further improved; and 5' is preferably added to the filler. Examples of the broken compound include potassium potassium, Wei Fna, Wei Ci, Ai Huaming, Mohuahua, moth steel, sputum sputum, sputum (four), snail tin, moth chin, and the like. 160018.doc •25· 201226189 The addition ratio of these additives is preferably % by weight in the dye solution. In the male compound, it is preferred to add deuteration. In the case where potassium peroxide is added, the ratio of the moth to the unloading is preferably in the weight ratio. Within the range 'better' is between 1:6 and 1:8. Within the range of 1: 7 to 1: 70. The immersion time of the film in the dyeing solution is not particularly limited, and is usually preferably in the range of 15 seconds to 15 minutes, more preferably 1 minute to 3 minutes. Further, the degree is preferably in the range of 1 Torr, more preferably in the range of 20 to 40 C. You can <crosslinking step> The cross-linking process can be performed after the dyeing step. The crosslinking treatment is carried out, for example, by immersing the stretching film in a solution (cross-linking solution) containing a crosslinking agent. A previously known substance f can be used as a crosslinking agent. For example: sand:: compound, or ", pent,. These may be used in combination or in combination of two or more. A solution obtained by dissolving a crosslinking agent in a solvent can be used. As the solvent, for example, water may be used, and the water may be used as a solvent, and the organic solvent may be contained in combination with water. The cross-linking in the cross-linking solution is not particularly limited to the range of from 1 to 20% by weight, more preferably 5% by weight. : Moth compounds can be added to the crosslinking solution. By the addition of the telluride, the polarization characteristics in the plane of the layer are more uniform. As an obstacle, for example, potassium moth, deuterated warp, sodium sulphate, molybdenum, sulphate, bismuth: copper diiodide, cesium iodide, calcium iodide, tin iodide, titanium iodide . The amount of iodide 3 is 0.05 to 15 wt%/0, more preferably 5 to 8 wt%. 160018.doc

S -26 - 201226189 The laminating film is preferably cross-linked for a period of 15 seconds, more preferably 30 seconds, in the range of 10 to 8 ° C, <washing step> ~2〇~15 minutes. Further, it is preferred that the temperature of the crosslinking solution is after the crosslinking step, preferably a washing step. As a washing step, a water washing treatment can be carried out. The water washing treatment can be usually carried out by using the laminated film 1 in pure water such as ion-exchanged water or steamed water. Washing water temperature through ... ~ 耽, preferably for the generation of ~ thief range. The immersion time is usually 2,300 seconds, preferably 3 seconds to 240 seconds. The washing step may be a combination of a washing treatment using a barrier solution and a water washing treatment, or a solution prepared by appropriately mixing a liquid alcohol such as hydrazine #, ethanol, isopropanol, butanol or propanol. <Drying step> The drying step can also be carried out after washing the step. As the drying step, any appropriate method (for example, natural drying, air drying, and heat drying) can be employed. For example, the drying temperature in the case of heat drying is usually 20 to 95 ° C. The drying time is usually about -15 minutes. Through the above steps, the polyvinyl alcohol-based resin film has a function as a polarizing element layer, and a polarizing layer 臈 having a polarizing element layer on one surface of the substrate film is produced. (Polarizing Element Layer) The polarizing element layer is specifically formed by displacing a dichroic dye to a uniaxially stretched polyvinyl alcohol resin film. The stretching ratio is preferably more than 5 times' and more preferably more than 5 times and 17 times or less. 160018.doc -27- 201226189 The thickness of the polarizing element layer (the thickness of the stretched polyvinyl alcohol resin film) is preferably 25 μm or less, more preferably 2 μm or less, and preferably 2 μί. By setting the thickness of the polarizing element layer to 25 μη or less, a thin polarizing laminated film can be formed. <Protective film bonding step (S40)> A protective film is bonded to the surface of the polarizing element layer of the polarizing laminated film on the side opposite to the surface on the substrate film side. The bonding method of the polarizing element layer and the protective film is not particularly limited. For example, an adhesive layer or an adhesive layer is formed on the bonding surface of the polarizing element layer and/or the protective film, and the two are bonded via an adhesive layer or an adhesive layer. The material suitable as the adhesive layer or the adhesive layer is the same as the adhesive layer or the adhesive layer described in the above-mentioned resin film bonding step (S10). (Protective film) The protective film may be a single protective film having no optical function, or may be a protective film having both the optical function of the retardation film or the brightness enhancement film. The material of the protective film is not particularly limited, and examples thereof include a cyclic polyolefin resin film: a cellulose acetate resin film containing a resin such as cellulose triacetate or cellulose diacetate, and polyphenylene terephthalate. A polyester resin film of a resin such as formic acid ethanediacetate, polyethylene naphthalate, or polybutylene terephthalate, a polycarbonate resin film, an acrylic resin film, a polypropylene resin film, or the like , a membrane widely used in the field since the prior art. As the % hydrocarbon-based resin, a suitable product can be preferably used, for example, T〇pas (registered trademark) (manufactured by Tic〇na Co., Ltd.), and eight-plus registrar 16018.doc -28-201226189 (JSR) (share) manufacturing), Zeonor (ZEONOR) (registered trademark transcript

Zeon (manufactured by the company)) Zeonex (registered trademark) (ΖΕ〇ΝΕχ^曰本

Zeon (manufactured by the company), Apel (registered trademark) (manufactured by Mitsui Chemicals Co., Ltd.), etc. When a film is formed by forming a film of the cyclic polyolefin-based resin, a known method such as a solvent casting method or a melt extrusion method is suitably employed. 'You can also use S-SINA (registered trademark) (made by Sekisui Chemical Industry Co., Ltd.), SCA4〇 (made by Sekisui Chemical Industry Co., Ltd.), Ze〇nor (registered trademark) Film (〇ptr〇nics) A product of a film made of a cyclic polyolefin resin which has been previously formed into a film. The cyclic polyolefin resin film may be uniaxially stretched or biaxially stretched. By stretching, an arbitrary phase difference value can be imparted to the cyclic polyolefin resin film. The stretching is usually carried out while continuously rolling out the film roll while continuing in the heating furnace toward the roll, in a direction perpendicular to the advancing direction, or both. The temperature of the heating furnace is usually in the range from the vicinity of the glass transition temperature of the cyclic polyolefin resin to the glass transition temperature + 1 〇〇〇 c. The magnification of the extension is usually Li to 6 times in each direction, preferably 1; 1 to 3 5 times. Since the cyclic polyolefin-based resin film generally has poor surface activity, it is preferred to subject the surface to the polarizing element layer to a surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame treatment, or saponification treatment. Among them, plasma treatment and corona treatment which can be carried out relatively easily are preferred. As the cellulose acetate-based resin film, a suitable product can be preferably used, for example, Fujitac (registered trademark) TD8 (manufactured by Fuji Fiim Co., Ltd.), Fujitac (registered trademark) TD8 〇 UF (manufactured by Fuji Fnm Co., Ltd.) ), Qingjia (registered trademark) TD80UZ (manufactured by Fuji Film), Fujitac (registered company 160018.doc • 29-201226189) TD40UZ (manufactured by Fuji Film), KC8UX2M (made by Konica Minolta Opto) ), KC4UY (manufactured by K〇nica Minolta Opto). A liquid crystal layer or the like may be formed on the surface of the cellulose acetate resin film in order to improve the viewing angle characteristics. Further, in order to impart a phase difference, the cellulose acetate-based osmium film may be extended. For the adhesion of krfj to the polarizing film, the cellulose acetate resin film is usually subjected to a saponification treatment. As the saponification treatment, a method of immersing in an alkaline aqueous solution such as sodium hydroxide or potassium hydroxide can be employed. A hard coat layer, an antiglare layer, and an antireflection layer 4 optical layer may be formed on the surface of the protective film as described above. The method of forming the optical layers on the surface of the protective film is not particularly limited, and a known method can be used. The thickness of the protective film is preferably as thin as possible, preferably 90 μm or less, more preferably 5 μm or less. On the other hand, if it is too thin, the strength is lowered and the workability is deteriorated, so it is preferably 5 μm or more. <Substrate film peeling step (S50)> In the method for producing a polarizing plate of the present embodiment, as shown in Fig. 2, after the protective film bonding step (s4 (8)) in which the protective film is bonded to the polarizing element layer 'The base film peeling step (S5〇) is carried out. In the base film peeling step (10)), the base film is peeled off from the partial film. The method of peeling off the base film is not particularly limited. The same method as the peeling step of the release film which is carried out in a usual polarizing plate with an adhesive can be employed. After the protective film bonding step (S4〇), it can be directly removed immediately, or after the --rolling is reported, a peeling step is additionally provided to perform the peeling. Through the above steps, a polarizing plate having a protective film on the surface of the polarizing element layer is manufactured. 160018.doc • 30 - 201226189 (Other optical layers) The polarizer described above can be used as a polarizing plate with other optical layers in the actual use. Further, the protective film may have the function of the optical layers. Examples of the other optical layer include a reflective polarizing film that transmits a polarized light having a certain opposite polarity and a reverse polarity of H 7F, and an anti-glare film having a concave-convex shape on the surface, and a belt. The surface of the film having a surface anti-reflection function has a reflective film, a transflective film having a reflective function and a penetrating function, and a viewing angle compensation film. As a sales item corresponding to a reflective polarizing film that transmits a polarized light and reflects the polarized light having the opposite property, for example,

DBEF (manufactured by 3M Company can be obtained from Sumitomo 3M (share)), APF (manufactured by 3M Company, available from Sumitom〇 3M (share)), and the like. Examples of the viewing angle compensation film include an optical compensation film in which a liquid crystal compound is applied to the surface of the substrate, a retardation film containing a polycarbonate resin, and a retardation film containing a cyclic polyolefin resin. As a sales item corresponding to an optical compensation film coated with a liquid crystal compound on the surface of a substrate, it can be listed as: WV Film (manufactured by Fuji Film Co., Ltd.) and NH Film (manufactured by Shin Sakamoto Oil Co., Ltd.) ), NR Film (manufactured by Shin Sakamoto Oil Co., Ltd.). In addition, as a sales item of a retardation film containing a cyclic polyolefin-based resin, Artone (registered trademark) Film (JSR (manufactured)), S-SINA (registered trademark) (Sui Shui Chemical Industry Co., Ltd.) ) Manufacturing), Zeonor (registered trademark) Film (manufactured by Optronics), and the like. [Examples] 1600H8.doc -31-201226189 [Example 1] <Production of polyvinyl alcohol-based resin film> Fully-supplied $ KU resin (trade name: PVA124) sold by KUraray Co., Ltd. The powder is dissolved in warm water of a thief to prepare an aqueous solution of a polyethylene glycol resin having a solid content of 1 (% by weight). The obtained polyvinyl alcohol resin aqueous solution was applied by a lip coating method to a PET substrate subjected to release treatment at a thickness of about 4 〇〇 μη 2 . After drying for 1 minute, the polyvinyl alcohol-based resin film was peeled off from the PET substrate, and further dried at 8 ° C for 5 minutes to obtain a curl-free polyvinyl alcohol-based resin film. The thickness after drying was 41 μm. <Resin film bonding step> The polyethylene glycol powder and the crosslinking agent were dissolved in hot water to prepare an aqueous solution of an adhesive having the following composition. Further, a corona discharge treatment was performed on a 11 μm thick base film comprising a polypropylene resin (trade name: FLX80E4, manufactured by Sumitomo Chemical Co., Ltd.), and the thickness after drying was 0 using a gravure coater. - The above aqueous solution of the adhesive is applied in a manner of about 2 μm. Thereafter, after bonding to the above polyvinyl alcohol-based resin film, it was 5 Torr. (: drying for 3 minutes to obtain a laminated film. The obtained laminated film was smooth and easy to handle. (Aqueous aqueous solution) Water: 100 parts by weight, polyvinyl alcohol resin powder (manufactured by Kuraray, average polymerization degree: 18,000, Trade name: KL-318) : 3 parts by weight, polyamide resin (crosslinking agent, manufactured by Sumika Chemtex Co., Ltd., trade name: SR650 (30)): 1.5 parts by weight. <Extension step>

160018.doc •32· S 201226189 The above-mentioned laminated film was subjected to 58 times of free end uniaxial stretching using a tenter-loaded glass. The thickness of the extended polyethylene glycol resin film is 18 μηι 〇 <staining step> • Thereafter, the laminated film is immersed in a solution of iodine and potassium iodide in 3 (r dye solution for 80 seconds) Left and right, after dyeing the polyethylene film (4) resin film, rinse the remaining iodine solution with 10 C of pure water, and then dipped for 3 seconds in a cross-linking solution of a mixed solution of boron ytterbium and potassium iodide in 76 〇c. After that, it is washed with 10 C of pure water for 4 seconds, and finally the remaining water knife on the surface is removed by a nip roller. The mixing ratio of the liquid layers of each layer is as follows. The laminated film after dyeing is at 80 ° C Drying for 5 minutes to obtain a polarizing laminated film (dyeing solution) Water: 100 parts by weight, iodine: 0.6 parts by weight, potassium iodide: 1 part by weight. (cross-linking solution) Water: 100 parts by weight, boric acid: 95 parts by weight, Potassium iodide: 5 parts by weight. <Protective film bonding step> An aqueous solution of an adhesive agent which is the same as the resin film bonding step is prepared. The surface of the polarizing element layer of the polarizing laminated film on the side opposite to the surface of the substrate film side After applying the above aqueous solution of the adhesive, the protective film is attached (K TAnica Min〇ita TAPt〇 manufactured by TP: KC4UY), obtained a polarizing plate comprising a base film, an adhesive layer, a polarizing element layer, an adhesive layer, and a protective film. Peeling step > The polarizing plate was dried at 80 ° C for 5 minutes to obtain a polarizing plate. The polarizing plate obtained from 160018.doc -33·201226189 peeled off the base film. The base film was easily peeled off to obtain an adhesive. a polarizing plate having four layers of a layer, a polarizing element layer, an adhesive layer, and a protective film. The thickness of the polarizing plate is 18 μm. The polarizing performance of the obtained polarizing plate is measured by a spectrophotometer (V7100) manufactured by JASCO Corporation. The incident direction of the light is taken from the side of the polarizing element layer. The visibility correction monomer transmittance is 41.8%, the visibility correction polarization degree is 99.997%, and the polarization performance is excellent, which is sufficient for the performance of the polarizing plate. 1] After the corona discharge treatment was performed on the same substrate film as in Example 1, the aqueous solution of the polyethylene glycol resin used in the production of the polyethylene resin film in Example 1 was directly applied by the gap coating method. Thereafter, continued at 5 The drying was carried out for 10 minutes at 80 ° C for 10 minutes, and the shrinkage of the polyacetic acid resin layer was caused to cause significant curling, and the end portion of the drying furnace was folded. The obtained polyvinyl alcohol resin was obtained. The thickness of the layer after drying is about 39 μm. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flow chart showing an embodiment of a method for producing a polarizing laminated film of the present invention. Fig. 2 is a view showing the manufacture of a polarizing plate of the present invention. A flow chart of one embodiment of the method. Fig. 3 is a flow chart showing an embodiment of a method for producing a polyvinyl alcohol resin film.

Sl° resin film bonding step 160018.doc

• 34· S 201226189 S20 Extension step S30 Dyeing step S40 Protective film bonding step S50 Substrate film peeling step S110 Resin layer forming step S120 First drying step S130 Resin layer separation step S140 Second drying step 160018.doc -35·

Claims (1)

201226189 VII. Patent application scope: 1. A method for producing a polarizing laminated film, which is a method for producing a polarizing laminated film comprising a base film and a polarizing element layer formed on one surface of the base film, and The procedure includes the following steps: a resin film bonding step of bonding a resin film containing a polyvinyl alcohol-based resin having a thickness of 50 μm or less to one surface of a substrate film to obtain a laminated film; and an extending step of uniaxially extending the laminated film And a dyeing step of dyeing the resin film of the uniaxially stretched laminate by a dichroic dye to form a polarizing element layer. 2. The method of producing a polarizing laminated film according to claim 1, wherein the resin film is bonded to one surface of the base film via an adhesive layer or an adhesive layer in the resin film bonding step. 3. The method for producing a polarizing laminated film according to claim 1 or 2, wherein the resin film has a thickness of 15 μm or more in the resin film bonding step. The method for producing a polarizing laminated film according to any one of claims 1 to 3, wherein the resin film used in the resin film bonding step is a resin film produced by a method comprising the following steps: a resin layer forming step of forming a resin layer containing a polyethylene glycol resin on a support; a first drying step of drying the resin layer formed on the support; and removing the dried resin layer from the support to obtain the above a resin layer separating step of the resin layer; and a second drying step of drying the peeled resin layer at a drying temperature higher than a temperature in the first drying step. 160018.doc 201226189 5. The method of manufacturing a polarizing plate is a method of manufacturing a polarizing plate having a polarizing element layer and a protective film formed on one surface of the polarizing element layer. After the polarizing laminated film is produced by the manufacturing method of the above-mentioned item 1, the method includes the following steps: a surface on the opposite side of the surface of the polarizing element layer from the substrate film side in the polarizing laminated film a protective film attaching step of bonding a protective film; and a substrate film peeling step of peeling the base film from the polarizing laminated film" 160018.doc