KR20140054012A - Method for producing polarizing laminate film - Google Patents

Abstract

A method for producing a polarizing laminated film comprising a base film in which a rubber component is dispersed in a thermoplastic resin and a polarizer layer laminated on one side of the base film, Forming a polyvinyl alcohol resin layer on the polyvinyl alcohol-based resin layer to obtain a laminated film; uniaxially stretching the laminated film to obtain a stretched film; staining the polyvinyl alcohol-based resin layer of the stretched film with a dichroic dye, And a step of immersing the polyvinyl alcohol-based resin layer of the dye film in a solution containing a crosslinking agent to crosslink the polyvinyl alcohol-based resin to form a polarizer layer from the polyvinyl alcohol-based resin layer to form a crosslinked film And a step of drying the cross-linked film.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for producing a polarizing laminated film,

The present invention relates to a method for producing a polarizing laminated film which is suitably used as a polarizing plate or an intermediate for producing the polarizing plate.

The polarizing plate is widely used as a polarizing light supplying element and a polarizing light detecting element in a liquid crystal display. As such a polarizing plate, a polarizing film made of a polyvinyl alcohol-based resin has been conventionally used in which a protective film made of triacetyl cellulose or the like is adhered to one or both sides of a polarizing film. However, in recent years, With the development (deployment) of a polarizing plate and development for a large-sized TV, further thinning of the polarizing plate is required.

For example, in JP-2000-338329-A, JP-2009-93074-A, JP-2009-98653-A and JP-2003-43257-A, a polyvinyl alcohol- Discloses use of a polarizing laminated film having a thin polarizer layer obtained by forming a resin layer made of a resin, followed by stretching treatment, dyeing treatment, or the like, as a polarizing plate or a manufacturing intermediate thereof.

In the production of the conventional polarizing laminated film, particularly when the stretching magnification at the time of stretching treatment is high, when the film is wound with a roll such as a nip roll at the time of dyeing the polyvinyl alcohol type resin layer, the film tears in the stretching direction There was a problem.

It is therefore an object of the present invention to provide a method for producing a polarizing laminated film which can satisfactorily suppress tearing in a stretching direction in a dyeing step.

The present invention includes the following.

[1] A method for producing a polarizing laminated film comprising a base film in which a rubber component is dispersed in a thermoplastic resin and a polarizer layer laminated on one side of the base film, Forming a polyvinyl alcohol resin layer on one side of the stretched film to obtain a laminated film; uniaxially stretching the laminated film to obtain a stretched film; and stretching the polyvinyl alcohol-based resin layer of the stretched film to a dichromatic dye A step of dying the polyvinyl alcohol resin layer to obtain a dye film; and a step of immersing the polyvinyl alcohol resin layer of the dye film in a solution containing a crosslinking agent to crosslink the polyvinyl alcohol resin to form a polarizer layer To obtain a crosslinked film, and a step of drying the crosslinked film.

[2] The method for producing a polarizing laminated film according to [1], wherein the thermoplastic resin is a polypropylene-based resin.

[3] The process for producing a polarizing laminated film according to [1], wherein the thermoplastic resin is a propylene homopolymer.

[4] The process for producing a polarizing laminated film according to any one of [1] to [3], wherein the rubber component comprises an ethylene unit.

[5] The process for producing a polarizing laminated film according to [4], wherein the rubber component is a copolymer comprising at least one unit selected from the group consisting of an ethylene unit, a propylene unit, a butene unit, an octene unit and a styrene unit.

[6] The process for producing a polarizing laminated film according to [4] or [5], wherein the content of the ethylene unit in the copolymer is more than 10% by weight but less than 90% by weight.

[7] A polarizing laminated film comprising a base film in which a rubber component is dispersed in a thermoplastic resin, and a polarizer layer having a thickness of 10 μm or less and laminated on one side of the base film.

According to the present invention, in addition to being able to provide a thin polarizing laminated film having a thin polarizer layer, a thermoplastic resin film in which a rubber component is dispersed is used as a base film, so that tearing in the stretching direction Can be effectively suppressed, and the polarizing laminated film can be produced stably with good yield.

The polarizing laminated film of the present invention can be suitably applied as a polarizing plate for a liquid crystal display device used in a liquid crystal display device, for example, a mobile terminal, or an intermediate for producing the same.

1 is a schematic cross-sectional view showing an example of a laminated film obtained in a lamination step.
2 is a schematic cross-sectional view showing an example of a stretched film obtained in the stretching process.
3 is a schematic sectional view showing an example of a dye film obtained in a dyeing step.
4 is a schematic cross-sectional view showing an example of a crosslinked film obtained in a crosslinking step.
5 is a schematic sectional view showing an example of a polarizing laminated film.
6 is a schematic sectional view showing an example of a polarizing plate with a protective film.

≪ Method for producing a polarizing laminated film &

The method for producing a polarizing laminated film according to the present invention includes the following steps.

(a) a lamination step of forming a polyvinyl alcohol-based resin layer on one side of a base film in which a rubber component is dispersed in a thermoplastic resin to obtain a laminated film,

(b) a stretching step of uniaxially stretching the laminated film to obtain a stretched film,

(c) a dyeing step of dying a polyvinyl alcohol-based resin layer of a stretched film with a dichroic dye to obtain a dyeing film,

(d) a crosslinking step of immersing the polyvinyl alcohol-based resin layer of the dye film into a solution containing a crosslinking agent to crosslink the polyvinyl alcohol-based resin to form a polarizer layer from the polyvinyl alcohol-based resin layer to obtain a crosslinked film, and

(e) a drying process for drying the crosslinked film.

The base film used in the present invention has a high tear strength even after stretching at a high magnification in the stretching step (b) by dispersing the rubber component, and therefore the film in the stretching direction in the dyeing step (c) The resistance to tearing is effectively improved. The present invention is also advantageous in that a desired effect can be obtained without increasing the manufacturing process. Hereinafter, a method for producing a polarizing laminated film of the present invention will be described in detail with reference to Figs. 1 to 4. Fig.

(a) Laminating process

In this step, referring to Fig. 1, a polyvinyl alcohol-based resin layer 20 is formed on one surface of a base film 10 made by dispersing (blending and dispersing) a rubber component in a thermoplastic resin to form a laminated film 100).

(Substrate film)

The thermoplastic resin serving as the base of the base film 10 is preferably a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, stretchability and the like. Specific examples of such a thermoplastic resin include, but are not limited to, a chain polyolefin resin, a cyclic polyolefin resin, a (meth) acrylic resin, a polyester resin, a cellulose ester resin, a polycarbonate resin, a polyvinyl alcohol resin Polyvinyl acetate resin, polyallylate resin, polystyrene resin, polyether sulfone resin, polysulfone resin, polyamide resin, polyimide resin, and mixtures and copolymers thereof.

From the viewpoint of handleability of the base film 10, it is preferable that the thermoplastic resin is rigid at room temperature and normal pressure (25 DEG C, 101.3 kPa). The term "rigid" means that the glass transition temperature Tg of the amorphous polymer is higher than the room temperature under normal pressure, and in the case of the crystalline polymer, the crystallization melting point Tm is higher than the room temperature under normal pressure. Considering what is provided in the stretching step (b), a thermoplastic resin having a Tg or Tm of 100 DEG C or more is very suitable.

As the chain polyolefin resin, a polypropylene resin (a polypropylene resin which is a homopolymer of propylene or a copolymer mainly composed of propylene), a polyethylene resin (a homopolymer of ethylene, Polyethylene resin, a copolymer mainly composed of ethylene, etc.) and the like are preferably used. The chain polyolefin resin is often crystalline, and the polypropylene resin which is a homopolymer of propylene generally has a crystallization melting point Tm in the range of 150 to 180 ° C. In the case of a polyethylene resin which is a homopolymer of ethylene, the crystallization melting point Tm may vary depending on the density and the like, but is generally in the range of 100 to 140 占 폚.

The heat resistance and flexibility of the base film 10 can be improved by using a polypropylene type resin in which propylene as a main component is copolymerized with various types of monomers or a polyethylene type resin in which ethylene is used as a main component and various kinds of monomers are copolymerized.

Examples of various types of monomers copolymerizable with propylene include ethylene and? -Olefin. The? -olefin is preferably an? -olefin having 4 or more carbon atoms, and more preferably an? -olefin having 4 to 10 carbon atoms. Specific examples of the? -Olefin having 4 to 10 carbon atoms include linear monoolefins such as 1-butene, 1-pentene, 1-hexene, 1-heptene, Branched monoolefins such as methyl-1-butene, 3-methyl-1-pentene and 4-methyl-1-pentene; vinylcyclohexane and the like. The copolymer of propylene and other monomer copolymerizable therewith may be a random copolymer or a block copolymer.

Examples of other monomers copolymerizable with ethylene include, for example,? -Olefins. As the? -olefin, propylene and an? -olefin having 4 or more carbon atoms are preferably used, and more preferably propylene and? -olefin having 4 to 10 carbon atoms.

Among them, propylene homopolymer, propylene-ethylene random copolymer, propylene-1-butene random copolymer and propylene-ethylene-1-butene random copolymer are preferably used as the polypropylene type resin. As the polyethylene-based resin, a homopolymer of ethylene, an ethylene-propylene random copolymer, an ethylene-1-butene random copolymer and an ethylene-propylene-1-butene random copolymer are preferably used.

The stereoregularity of the polypropylene resin is preferably substantially isotactic or syndiotactic. The base film made of such a propylene resin has relatively good handling properties and excellent mechanical strength under a high temperature environment.

When the chain polyolefin-based resin is composed of a copolymer of a main monomer and a monomer of a different kind (copolymerization component), the content (copolymerization ratio) of the monomer of the other kind is preferably a small amount, specifically 10 wt% By weight or less. When the copolymerization ratio is small, the copolymer contains a large number of crystallized segments under ordinary temperature and pressure, and is liable to become a rigid resin. On the other hand, if the copolymerization ratio is too large, there may be a case where the polymer is liquid at room temperature and normal pressure, or the heat resistance is lowered in the opposite direction. The copolymerization ratio of various kinds of monomers in the copolymer can be calculated from the mass balance at the time of polymerization and can be calculated from the method described in "Polymer Analysis Handbook" (published by Kenokuniya Shoten Publishing Co., 1995) on page 616 Can be obtained by carrying out an infrared (IR) spectral measurement.

The cyclic polyolefin-based resin is a generic name of a resin that is polymerized using a cyclic olefin as a polymerization unit and includes, for example, those described in JP-01-240517-A, JP-03-14882-A, JP-03-122137- Resin. Specific examples of the cyclic polyolefin resin include a ring-opening (co) polymer of a cyclic olefin, an addition polymer of a cyclic olefin, a copolymer (typically, a random copolymer) of a cyclic olefin and a chain olefin such as ethylene or propylene, And graft polymers obtained by modifying these with an unsaturated carboxylic acid or a derivative thereof, and hydrides thereof. Among them, a norbornene-based resin using a norbornene-based monomer such as norbornene or a polycyclic norbornene-based monomer as a cyclic olefin is preferably used.

Examples of commercially available products of cyclic polyolefin resins include "Topas" (available from TOPAS ADVANCED POLYMERS GmbH, available from Polyplastics Co., Ltd.), "Aton" (manufactured by JSR Corporation) ZEONOR "(manufactured by Nippon Zeon Co., Ltd.)," ZEONEX "(manufactured by Nippon Zeon Co., Ltd.) and" APEL "(manufactured by Mitsui Chemicals).

Examples of the (meth) acrylic resin include poly (meth) acrylates such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, Styrene copolymer (MS resin and the like), a polymer having an alicyclic hydrocarbon group (for example, methyl methacrylate-methyl methacrylate-cyclohexyl methacrylate copolymer) Hexyl copolymer, methyl methacrylate- (meth) acrylate norbornyl copolymer, and the like). (Meth) acrylate having an alkyl moiety having 1 to 6 carbon atoms, such as methyl (meth) acrylate, and more preferably methyl methacrylate as a main component (50 to 100% by weight, preferably 70 To 100% by weight).

The polyester-based resin is a polymer having an ester bond, and can be obtained, for example, by polycondensation of a polyvalent carboxylic acid (including an ester thereof) and a polyhydric alcohol. As the polyvalent carboxylic acid, mainly divalent carboxylic acid is used, and examples thereof include isophthalic acid, terephthalic acid, dimethyl terephthalate, dimethyl naphthalenedicarboxylate, and the like. As polyhydric alcohols, mainly divalent alcohols are used, and for example, propanediol, butanediol, neopentyl glycol, cyclohexanedimethanol and the like can be given. Specific examples of the polyester resin include, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, Phthalate, polycyclohexanedimethanol naphthalate, and the like. These blend resins and copolymers can also be suitably used.

The cellulose ester resin is an ester of cellulose and a fatty acid. Specific examples of the cellulose ester-based resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, cellulose dipropionate and the like, copolymers thereof, and those obtained by modifying a part of hydroxyl groups with substituents or the like have. Of these, cellulose triacetate is particularly preferable. Many products of cellulose triacetate are commercially available and are advantageous in terms of availability and cost. Examples of commercially available products of cellulose triacetate include all trade names such as "Fujitack TD80" (manufactured by Fujifilm Corporation), "Fujitac TD80UF" (manufactured by Fujifilm Corporation), "Fujitac TD80UZ" (Manufactured by Konica Minolta Opt.), KC4UY (manufactured by Konica Minolta Opt.), And the like can be given.

The polycarbonate resin is an engineering plastic made of a polymer having a monomer unit bonded through a carbonate group, and is a resin having high impact resistance, heat resistance and flame retardancy. Also, since it has high transparency, it is very suitably used in optical applications. In the optical use, resins called modified polycarbonates such as modified polymer skeleton for lowering the photoelastic coefficient, and copolymerized polycarbonates improved in wavelength dependency are also commercially available, and these can also be suitably used. Examples of commercially available products of polycarbonate resin include all products sold under the trade names of Panlite (Daiejin Kasei Co., Ltd.), Yuferon (Mitsubishi Engineering Plastics Co., Ltd.), SD Polycar (Sumitomo Dow Co., ), And Caliber (Dow Chemical Co., Ltd.).

The rubber component dispersed in the thermoplastic resin is a resin component having rubber elasticity and is usually uniformly dispersed in the thermoplastic resin as rubber particles. By mixing and dispersing the rubber component, the tear strength of the base film and thus the stretched film can be improved. The rubber component is not particularly limited as long as it is a resin having rubber elasticity, but from the viewpoint of compatibility with the thermoplastic resin, it is preferable that the rubber component is composed of the same or similar resin as the thermoplastic resin to be used.

For example, when the thermoplastic resin is a chain polyolefin resin, the rubber component may be a copolymer of two or more kinds of monomers selected from ethylene and? -Olefin. In this case, the content (polymerization ratio) of each monomer constituting the copolymer is preferably less than 90% by weight, more preferably less than 80% by weight. If the content of any one of the monomer units is excessively high, a continuous segment of the monomer unit tends to be formed, and crystallization tends to occur, resulting in the loss of rubber elasticity.

As the rubber component composed of the copolymer of two or more kinds of monomers, various copolymers including an ethylene unit can be suitably used. Of these, a propylene unit, a butene unit, an octene unit and a styrene unit And a copolymer comprising at least one unit selected from the group consisting of The content (polymerization ratio) of the ethylene unit in the copolymer is preferably more than 10% by weight but less than 90% by weight, more preferably 20% by weight or more and 80% by weight or less, still more preferably 25% By weight or less. One preferred embodiment of the base film used in the present invention is a method in which a polypropylene resin (for example, a propylene homopolymer) is used as a thermoplastic resin and a copolymer containing an ethylene unit in the above content as a rubber component is dispersed It is.

The content of the ethylene unit in the copolymer can be calculated from the mass balance at the time of polymerization, and the content of the ethylene unit in the copolymer can be calculated by the method described in "Polymer Analysis Handbook" (issued by Kenokuniya Shoten Publishing Co., 1995) (IR) spectrum measurement.

When the thermoplastic resin is a (meth) acrylic resin, it is preferable to contain an acrylic polymer having rubber elasticity as a rubber component from the viewpoint of compatibility. The acrylic polymer is preferably a polymer mainly composed of alkyl acrylate, and may be a homopolymer of alkyl acrylate or a copolymer of 50 wt% or more of alkyl acrylate and 50 wt% or less of other monomer.

As the alkyl acrylate, generally, the alkyl group having 4 to 8 carbon atoms is used. Examples of the other monomers include alkyl methacrylates such as methyl methacrylate and ethyl methacrylate, styrene monomers such as styrene and alkyl styrene, and monofunctional monomers such as unsaturated nitrile such as acrylonitrile and methacrylonitrile , Alkenyl esters of unsaturated carboxylic acids such as allyl (meth) acrylate and methallyl (meth) acrylate, dialkyl esters of dibasic acid such as diallyl maleate, glycols such as alkylene glycol di (meth) And unsaturated carboxylic acid diesters of polyfunctional monomers.

The rubber component containing an acrylic polymer is preferably in a particulate form, and more preferably a particle of a multi-layer structure having a layer of an acrylic polymer. Layer structure having a polymer mainly composed of alkyl methacrylate on the outer side of the layer (nucleus) of the acrylic polymer, and further, a polymer having a polymer mainly composed of alkyl methacrylate on the inner side of the acrylic polymer layer Layer structure having a layer (nucleus). The acrylic rubber particles having a multi-layer structure can be produced, for example, by the method described in JP-55-27576-B.

The blending amount of the rubber component is preferably 5 to 50% by weight, more preferably 10 to 45% by weight, of the thermoplastic resin. If the blending amount of the rubber component is too small, a sufficient tear strength improving effect tends not to be obtained. If the blending amount of the rubber component is too large, handling property of the base film tends to decrease.

The method of dispersing the rubber component in the thermoplastic resin is not particularly limited, and examples thereof include a method of kneading and dispersing the separately prepared thermoplastic resin and the rubber component (rubber particles) with a Prist mill or the like, And a reactor blend method in which a rubber component is also prepared in a reaction vessel to obtain a thermoplastic resin in which a rubber component is dispersed. The reactor blend method is advantageous for improving the degree of dispersion of the rubber component.

In addition to the above-mentioned thermoplastic resin and rubber component, any suitable additives may be added to the base film 10. Such additives include, for example, a compatibilizing agent, an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a releasing agent, a coloring inhibitor, a flame retardant, a nucleating agent, an antistatic agent, a pigment and a colorant for improving the dispersibility of the rubber component have. The total content of the thermoplastic resin and the rubber component in the base film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, particularly preferably 70 to 97% to be. When the total content is less than 50% by weight, there is a fear that the transparency and the like inherently possessed by the thermoplastic resin may not be sufficiently manifested.

The compatibilizing agent may be a low molecular compound, but it is more preferable to use a compatibilizing agent composed of a polymer in view of bleeding and the like. Examples of the compatibilizer made of a polymer include a block copolymer, and specific examples thereof include a styrene-ethylene-butene-styrene block copolymer and the like.

The thickness (before stretching) of the base film 10 in the laminated film 100 is not particularly limited, but is preferably 1 to 500 占 퐉, more preferably 1 to 300 占 퐉, from the viewpoint of workability such as strength and handling property, More preferably 5 to 200 占 퐉, and most preferably 5 to 150 占 퐉.

The surface of the base film 10 on the side where the polyvinyl alcohol type resin layer 20 is formed is subjected to adhesion treatment such as corona treatment, plasma treatment, flame treatment, or the like in order to improve the adhesion with the polyvinyl alcohol- An improvement treatment may be performed, or a thin layer such as a primer layer or an adhesive layer may be formed.

(Polyvinyl alcohol-based resin layer)

Examples of the polyvinyl alcohol-based resin forming the polyvinyl alcohol-based resin layer 20 include a polyvinyl alcohol resin and derivatives thereof. Examples of the derivative of the polyvinyl alcohol resin include polyvinyl formal, polyvinyl acetal, and the like. The polyvinyl alcohol resin may be mixed with an unsaturated carboxylic acid such as olefin such as ethylene or propylene, acrylic acid, methacrylic acid or crotonic acid, Or an alkyl ester, acrylamide, or the like. Of these, polyvinyl alcohol resins are preferably used.

The polyvinyl alcohol-based resin is preferably a completely saponified product. The degree of saponification is preferably 80.0 to 100.0 mol%, more preferably 90.0 to 99.5 mol%, still more preferably 94.0 to 99.0 mol%. When the degree of saponification is less than 80.0 mol%, there is a problem that the water resistance and moisture resistance after lamination of the polarizing laminated film are remarkably poor. When a polyvinyl alcohol resin having a degree of saponification of more than 99.5 mol% is used, the dyeing speed is remarkably slowed, and a polarizing laminated film having sufficient polarization performance may not be obtained. In addition, It may be inconvenient to require several times as many times as the number of times.

The saponification degree referred to herein is a value defined by the following formula, expressed as unit ratio (mol%) of the ratio of the acetic acid group contained in the polyvinyl acetate-based resin as the raw material of the polyvinyl alcohol-based resin to the hydroxyl group by the saponification process . It can be obtained by a method defined in JIS K 6726 (1994).

Saponification degree (mol%) = (number of hydroxyl groups) / (number of hydroxyl groups + number of acetic acid groups) x 100

The average degree of polymerization of the polyvinyl alcohol-based resin is not particularly limited, but is preferably 100 to 10,000, more preferably 1,500 to 8,000, and most preferably 2,000 to 5,000. The average degree of polymerization as used herein is also a value obtained by a method determined by JIS K 6726 (1994).

Additives such as a plasticizer and a surfactant may be added to the above-mentioned polyvinyl alcohol-based resin, if necessary. As the plasticizer, a polyol and condensates thereof can be used, and examples thereof include glycerin, diglycerin, triglycerin, ethylene glycol, propylene glycol, and polyethylene glycol. The blending amount of the additive is not particularly limited, but is preferably 20% by weight or less of the polyvinyl alcohol-based resin.

The polyvinyl alcohol-based resin layer 20 is preferably formed by coating a polyvinyl alcohol-based resin solution obtained by dissolving a polyvinyl alcohol-based resin in a good solvent on one side of the base film 10, and evaporating the solvent by drying . According to this method, the polyvinyl alcohol-based resin layer 20 can be formed thin. Examples of the method of coating the polyvinyl alcohol resin solution on the base film 10 include a roll coating method such as a wire bar coating method, a reverse coating method and a gravure coating method, a spin coating method, a screen coating method, a fountain coating method, Method, and the like. The drying temperature is, for example, 50 to 200 ° C, preferably 60 to 150 ° C. The drying time is, for example, 2 to 20 minutes.

As described above, on the surface of the base film 10 on the side where the polyvinyl alcohol-based resin layer 20 is formed, before the polyvinyl alcohol-based resin layer 20 is formed, Layer may be formed in advance. The primer layer can be formed, for example, by coating a solution containing a polyvinyl alcohol-based resin and a cross-linking agent by the above-mentioned method, followed by drying.

Further, the polyvinyl alcohol-based resin layer 20 can be formed by adhering a film made of a polyvinyl alcohol-based resin onto the base film 10, but in this case, an adhesive can be used for adhesion between the films.

The thickness of the polyvinyl alcohol-based resin layer 20 in the laminated film 100 is preferably 3 μm or more and 50 μm or less, more preferably 5 μm or more and 45 μm or less. If the thickness is 3 μm or less, the film becomes too thin after stretching to remarkably deteriorate the dyeability. If it exceeds 50 μm, the resulting polarizing laminated film becomes thick.

(b)

This step is a step of uniaxially stretching a laminated film 100 comprising a base film 10 and a polyvinyl alcohol-based resin layer 20 to obtain a drawn film 200 (see Fig. 2). The stretching magnification of the laminated film 100 can be appropriately selected according to the desired polarization characteristics, but is preferably 5 times or more and 17 times or less, more preferably 5 times or more and 8 times or less the original length of the laminated film 100 to be. If the stretching magnification is 5 times or less, the stretched polyvinyl alcohol-based resin layer 20 'is not sufficiently oriented, and as a result, the degree of polarization of the polarizer layer does not become sufficiently high. On the other hand, if the stretching magnification exceeds 17 times, the film tends to be broken at the time of stretching, and the thickness of the film becomes thinner than necessary, which may lower the workability and handling property in subsequent steps. In the present invention, since the base film 10 in which the rubber component is dispersed as described above is used, the obtained stretched film 200 has high resistance to tearing in the stretching direction even when the stretching magnification exceeds 5 times. Therefore, according to the present invention, it is possible to provide a polarizing laminated film which exhibits high polarization characteristics and high durability.

The uniaxial stretching treatment is not limited to the one-stage stretching but may be performed in multiple stages. In this case, it is preferable to conduct the stretching treatment so that the stretching ratio exceeds 5 times the sum of the front ends of the stretching treatment.

The uniaxial stretching is preferably longitudinal stretching in which stretching is performed in the longitudinal direction (film transport direction) of the laminated film 100. Examples of the longitudinal stretching method include a roll-to-roll stretching method, a compression stretching method, and a stretching method using a tenter. The uniaxial stretching is not limited to the longitudinal stretching treatment, and may be oblique stretching or the like.

The stretching treatment can be carried out by both the wet stretching method and the dry stretching method, but the dry stretching method is preferable in that the stretching temperature can be selected from a wide range.

The stretching temperature is set in the vicinity of the glass transition temperature Tg or the crystallization melting point Tm of the base film and is preferably in the range of [(Tg or Tm) -30 ° C] to [(Tg or Tm) + 15 ° C] [(Tg or Tm) -25 DEG C] to [Tg or Tm]. If the stretching temperature is lower than [(Tg or Tm) -30 DEG C], it is difficult to elongate at a high magnification of more than 5 times. If the stretching temperature exceeds [(Tg or Tm) + 15 DEG C], the fluidity of the base film 10 tends to be too large to be stretched. In addition, the stretching temperature is within the above range, more preferably 120 deg. When the stretching temperature is 120 ° C or more, even if the stretching magnification exceeds 5 times, there is no difficulty in stretching treatment. The temperature adjustment of the stretching treatment is usually carried out according to the temperature regulation of the heating furnace.

The thickness of the uniaxially stretched base film 10 'in the stretched film 200 is usually 1 to 300 μm, preferably 1 to 100 μm when the thickness of the laminated film 100 is in the above range. The thickness of the uniaxially stretched polyvinyl alcohol-based resin layer 20 'in the stretched film 200 is preferably 1 to 10 μm, more preferably 2 to 8 μm. When the thickness of the polyvinyl alcohol-based resin layer 20 'is 1 μm or less, the thickness is too thin, and the dyability deteriorates remarkably. When the thickness exceeds 10 μm, the resulting polarizing laminated film becomes thick.

(c) Dyeing process

This step is a step of dying the polyvinyl alcohol resin layer 20 'of the stretched film 200 with a dichroic dye to obtain a dye film 300 (see FIG. 3). Examples of the dichroic dye include iodine and organic dyes. Examples of organic dyes include red BR, red LR, red R, pink LB, rubin BL, Borde GS, sky blue LG, lemon yellow, blue BR, blue 2R, navy RY, green LG, violet LB, violet B , Black H, Black B, Black GSP, Yellow 3G, Yellow R, Orange LR, Orange 3R, Crimson GL, Crimson KGL, Congo Red, Brilliant Violet BK, Supra Blue G, Supra Blue GL, Supra Orange GL, , Direct First Orange S, First Black, and the like can be used. These dichroic substances may be used singly or in combination of two or more.

The dyeing step can be performed, for example, by immersing the entire stretched film 200 in a solution (dyeing solution) containing the dichroic dye. As the dyeing solution, a solution in which the dichroic dye is dissolved in a solvent can be used. As the solvent of the dyeing solution, water is generally used, but an organic solvent compatible with water may be further added. The concentration of the dichroic dye is preferably 0.01 to 10% by weight, more preferably 0.02 to 7% by weight, and particularly preferably 0.025 to 5% by weight.

When iodine is used as the dichroic dye, it is preferable to further add iodide to the dyeing solution containing iodine since the dyeing efficiency can be further improved. Examples of the iodide include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, titanium iodide and the like. The concentration of iodide in the dyeing solution is preferably 0.01 to 20% by weight. Among iodides, it is preferable to add potassium iodide. When potassium iodide is added, the ratio of iodine to potassium iodide is preferably in the range of 1: 5 to 1: 100, more preferably 1: 6 to 1:80, more preferably 1: 7 to 1: 70 is particularly preferable

The immersion time of the stretched film 200 to the dyeing solution is not particularly limited, but is preferably in the range of 15 seconds to 15 minutes, more preferably 30 seconds to 3 minutes. The temperature of the dyeing solution is preferably in the range of 10 to 60 캜, more preferably in the range of 20 to 40 캜.

It is also possible to carry out the dyeing step before or simultaneously with the drawing step, but it is preferable to carry out the drawing step after the laminated film 100 so that the dichroic dye adsorbed to the polyvinyl alcohol-based resin layer can be favorably oriented.

(d) Crosslinking Process

In this step, the polyvinyl alcohol-based resin layer (30) of the dye film (300) obtained by dying with a dichroic dye is subjected to a crosslinking treatment to crosslink the polyvinyl alcohol-based resin to form a polyvinyl alcohol- (40) to obtain a crosslinked film (400) (see Fig. 4). The crosslinking step can be carried out, for example, by immersing the dyeing film 300 in a solution (crosslinking solution) containing a crosslinking agent. As the crosslinking agent, conventionally known materials can be used. Examples thereof include boron compounds such as boric acid and borax, and glyoxal and glutaraldehyde. These may be used alone or in combination of two or more.

As the crosslinking solution, a solution in which a crosslinking agent is dissolved in a solvent can be used. As the solvent, for example, water may be used, but an organic solvent which is further compatible with water may be contained. The concentration of the crosslinking agent in the crosslinking solution is preferably in the range of 1 to 20% by weight, more preferably 6 to 15% by weight.

Iodide may be added to the crosslinking solution. By adding iodide, the polarization characteristics in the plane of the polarizer layer 40 can be made more uniform. Examples of the iodide include potassium iodide, lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide and titanium iodide. The concentration of iodide is preferably 0.05 to 15% by weight, more preferably 0.5 to 8% by weight.

The dipping time of the dye film 300 for the crosslinking solution is preferably 15 seconds to 20 minutes, more preferably 30 seconds to 15 minutes. The temperature of the crosslinking solution is preferably in the range of 10 to 90 占 폚.

The crosslinking step may be carried out simultaneously with the dyeing step by blending the crosslinking agent into the dyeing solution. The crosslinking step and the stretching step may be performed at the same time.

(e) Drying process

The obtained crosslinked film 400 is usually cleaned and then dried. As a result, a polarizing laminated film is obtained (see Fig. 5). The cleaning can be performed by immersing the crosslinked film 400 in pure water such as ion-exchanged water or distilled water. The water washing temperature is usually in the range of 3 to 50 캜, preferably 4 to 20 캜. The immersion time is usually from 2 to 300 seconds, preferably from 5 to 240 seconds. The cleaning may be a combination of a cleaning treatment with a iodide solution and a water cleaning treatment, or a solution in which a liquid alcohol such as methanol, ethanol, isopropyl alcohol, butanol, or propanol is appropriately mixed.

As the drying method, any appropriate method (for example, natural drying, air blow drying, heat drying) may be employed. For example, in the case of heat drying, the drying temperature is usually 20 to 95 ° C, and the drying time is usually about 1 to 15 minutes.

The polarizing laminated film has a polarizer layer 40 made of a polyvinyl alcohol-based resin layer in which a dichroism dye is adsorbed and oriented, and can be used as a polarizing plate itself. According to the method of the present invention, since the thickness of the polarizer layer 40 can be set to 10 m or less, a thin polarizing laminated film can be obtained. The polarizing laminated film of the present invention is also excellent in polarization performance and durability.

≪ Method for producing polarizer with protective film >

The polarizing laminated film is also useful as an intermediate for producing a polarizing plate to which a protective film is attached. By using the polarizing laminated film, a polarizing plate with a protective film can be efficiently produced at a high yield. An example of a polarizing plate with protective film is shown in Fig. The illustrated polarizing plate 600 with a protective film has a protective film 50 on the side opposite to the side where the stretched base film 10 'in the polarizing layer 40 is laminated. Although the base film 10 'is peeled off in the example of Fig. 6, the polarizing plate with protective film may have the base film 10'.

The polarizing plate with protective film can be produced by the above-mentioned method including the following steps using the polarizing laminated film.

(A) a step of bonding the protective film 50 to the surface of the polarizing layer 40 of the polarizing laminated film 500 opposite to the side of the base film 10 '

(B) peeling off the base film 10 '. The step (B) is an arbitrary step as described above.

The protective film 50 may be made of the same resin as the above-mentioned resin as the thermoplastic resin constituting the base film. The protective film 50 may have a retardation imparted by uniaxial stretching or biaxial stretching.

The protective film 50 is preferably thin, but if it is too thin, the strength is lowered and the workability is poor. On the other hand, if it is too thick, the transparency may decrease, or the curing time required after lamination may become longer. Therefore, the thickness of the protective film 50 is preferably 80 占 퐉 or less, and more preferably 5 to 60 占 퐉. The total thickness of the polarizer layer 40 and the protective film 50 is preferably 100 占 퐉 or less, more preferably 9 占 퐉 or less, and still more preferably 80 占 퐉 or less from the viewpoint of thinning of the polarizing plate with protective film.

An optical layer such as a hard coat layer, an antiglare layer, a light diffusion layer, and an antireflection layer may be formed on the surface of the protective film 50 opposite to the polarizer layer 40.

The polarization of the polarizer layer 40 and the protective film 50 can be performed using an adhesive or an adhesive. Examples of the adhesive include aqueous adhesives such as a polyvinyl alcohol resin aqueous solution and an aqueous two-component type urethane emulsion adhesive. When a cellulose ester based resin film that has been subjected to a hydrophilization treatment such as a saponification treatment is used as the protective film 50, a polyvinyl alcohol-based resin aqueous solution is suitably used as an adhesive. The polyvinyl alcohol-based resin used as the adhesive includes a vinyl alcohol homopolymer obtained by saponifying polyvinyl acetate which is a homopolymer of vinyl acetate, a vinyl alcohol-based copolymer obtained by saponifying a copolymer of vinyl acetate and another monomer copolymerizable therewith , And further modified polyvinyl alcohol polymers obtained by partially modifying these hydroxyl groups. As the water-based adhesive, polyaldehyde, a water-soluble epoxy compound, a melamine compound, a zirconium oxide compound, a zinc compound, or the like may be added as an additive.

The method of bonding the polarizer layer 40 and the protective film 50 by using an aqueous adhesive is not particularly limited and examples of the method include a casting method, a Meyer bar coating method, a gravure coating method, a comma coater method, The adhesive is uniformly applied to the surface of the polarizer layer 40 and / or the protective film 50 by a blade method, a die coating method, a dip coating method, or a spraying method, and the other film is superimposed on the applied surface, And a method of coalescing and drying. The flexible method is a method in which the polarizer layer 40 or the protective film 50 as an object to be coated is moved in a generally vertical direction, a generally horizontal direction, or an inclined direction therebetween, Method.

After the polarizer layer 40 and the protective film 50 are laminated, the laminated film is dried to remove water contained in the water-based adhesive. The drying temperature is preferably 30 to 90 占 폚. If the temperature is lower than 30 占 폚, the polarizer layer 40 and the protective film 50 tend to peel off easily. If the temperature is higher than 90 占 폚, the polarization performance may be deteriorated by heat. The drying time may be 10 to 1000 seconds, and is preferably 60 to 750 seconds, more preferably 150 to 600 seconds from the viewpoint of productivity. After drying, it may be further cured at a room temperature or a slightly higher temperature, for example, at a temperature of about 20 to 45 ° C for about 12 to 600 hours. The curing temperature is generally set lower than the temperature employed at the time of drying.

A photo-curable adhesive may be used as an adhesive when the polarizer layer 40 and the protective film 50 are laminated. As the photo-curable adhesive, for example, a mixture of a photo-curable epoxy resin and a photo cationic polymerization initiator can be mentioned.

In the case of using a photocurable adhesive, the polarizing layer 40 and the protective film 50 are laminated in the same manner as described above, and then the active energy ray is irradiated to cure the photocurable adhesive. A light source of an active energy ray is not particularly limited, but an active energy ray having a light emission distribution at a wavelength of 400 nm or less is preferable. Specifically, a low energy mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, Excited mercury lamps, metal halide lamps are preferably used.

The light irradiation intensity for the photo-curable adhesive is suitably determined according to the composition of the photo-curable adhesive and is not particularly limited, but it is preferable that the irradiation intensity in the wavelength range effective for activating the polymerization initiator is 0.1 to 6000 mW / cm 2. When the irradiation intensity is not less than 0.1 mW / cm 2, the reaction time is not excessively long. When the irradiation intensity is not more than 6000 mW / cm 2, the heat radiated from the light source and heat generated during curing of the photocurable adhesive deteriorate the yellowing of the epoxy resin, Is less likely to occur. The light irradiation time for the photo-curable adhesive is applied in accordance with the photo-curable adhesive to be cured and is not particularly limited, but it is set to be 10 to 10000 mJ / cm 2 as the product of the irradiation intensity and the irradiation time desirable. When the total amount of light for the photo-curable adhesive is 10 mJ / cm < 2 > or more, a sufficient amount of active species originating from the polymerization initiator can be sufficiently generated to progress the curing reaction more surely. .

When the polarizer layer 40 and the protective film 50 are bonded to each other, adhesion of the polarizer layer 40 and / or the protective film 50 is improved by plasma treatment, corona treatment, ultraviolet irradiation The surface treatment such as treatment, flame treatment, saponification treatment and the like may be carried out as necessary. As the saponification treatment, a method of immersing in an aqueous solution of an alkali such as sodium hydroxide or potassium hydroxide may be mentioned.

On the other hand, the pressure-sensitive adhesive used in the bonding of the polarizer layer 40 and the protective film 50 is usually prepared by using an acrylic resin, a styrene resin, a silicone resin, or the like as a base polymer and adding an isocyanate compound, an epoxy compound, By weight of a crosslinking agent. Further, a pressure-sensitive adhesive layer containing fine particles and exhibiting light scattering properties may be used.

The thickness of the pressure-sensitive adhesive layer is preferably 1 to 40 占 퐉, but it is preferably thinly formed within a range that does not impair workability and durability, and more preferably 3 to 25 占 퐉. If the thickness of the pressure-sensitive adhesive layer is less than 1 占 퐉, the pressure-sensitive adhesive property tends to deteriorate. If the thickness exceeds 40 占 퐉, the pressure-sensitive adhesive tends to be exuded.

A method of sticking the polarizer layer 40 and the protective film 50 by a pressure-sensitive adhesive is not particularly limited, and a solution (pressure-sensitive adhesive composition) containing each component including the base polymer described above on the surface of the protective film surface or the polarizer layer, The polarizer layer 40 and the protective film 50 may be laminated after the pressure sensitive adhesive layer is formed on the surface of the protective film or the polarizer layer side And the polarizer layer 40 and the protective film 50 may be joined together.

Further, in order to improve the adhesion, a surface treatment such as corona treatment may be carried out in advance on the coplanar surface of the polarizer layer 40 and / or the protective film 50, or on one or both surfaces of the pressure-sensitive adhesive layer.

The step (B) is a step of peeling off the base film 10 'from the laminate having the base film 10' / polarizer layer 40 / protective film 50 obtained in the step (A). After the protective film 50 is kneaded, the base film 10 'may be peeled as it is. After the protective film 50 is fused, the base film 10' is rolled up once and rolled out, .

Example

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[Production of a polarizing laminated film]

≪ Example 1 >

(1) Production of base film

The thermoplastic resin and the rubber component were prepared in turn in the same reaction vessel by the reactor blend method. Specifically, a propylene monomer was fed in a gas phase as a first step using a chi-gras-natta type catalyst to prepare a propylene homopolymer which is a thermoplastic resin. The feed of the propylene monomer was stopped to stop the reaction and the ethylene monomer and the propylene monomer were fed in the gas phase as the second step as it is to the reaction vessel to produce an ethylene-propylene copolymer as the rubber component, To obtain a propylene homopolymer in which the copolymer was dispersed in particulate form. The content of the ethylene unit in the copolymer was determined from the mass balance at the time of polymerization, which was 35% by weight. The content of the ethylene unit in the entire resin (total of the thermoplastic resin and the rubber component) was determined in accordance with the method described on page 616 of the Polymer Handbook (published by Kenokuniya Shoten) in 1995. From this value, The content of the ethylene-propylene copolymer was calculated to be 29 wt% (i.e., the content of the ethylene-propylene copolymer was 40.8 wt% of the thermoplastic resin).

The obtained mixed resin was melted and kneaded at 250 占 폚 and melt extruded at a temperature of 280 占 폚 with a T-die to obtain a base film having a thickness of 100 占 퐉.

(2) Formation of primer layer

A polyvinyl alcohol aqueous solution having a concentration of 3% by weight was prepared by dissolving a polyvinyl alcohol powder ("Z-200" manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average polymerization degree: 1100, average saponification degree: 99.5 mol%) in hot water at 95 ° C . 5 parts by weight of a crosslinking agent ("Sumirez Resin 650" manufactured by Sumitomo Chemical Co., Ltd.) was added to the obtained aqueous solution in an amount of 6 parts by weight of the polyvinyl alcohol powder. The obtained mixed aqueous solution was coated on the corona-treated surface of the substrate film subjected to the corona treatment using a microgravure coater and dried at 80 DEG C for 10 minutes to form a primer layer having a thickness of 0.2 mu m.

(3) Formation of a polyvinyl alcohol-based resin layer

A polyvinyl alcohol aqueous solution having a concentration of 8% by weight was prepared by dissolving a polyvinyl alcohol powder ("PVA 124" manufactured by Kuraray Co., Ltd., average degree of polymerization: 2400, average degree of saponification: 98.0 to 99.0 mol%) in hot water at 95 ° C. The obtained aqueous solution was coated on the primer layer using a lip coater and dried under the conditions of 80 캜 for 2 minutes, 70 캜 for 2 minutes and then at 60 캜 for 4 minutes to form a poly A laminated film in which a vinyl alcohol-based resin layer was laminated was produced. The thickness of the polyvinyl alcohol-based resin layer was 9.8 mu m.

(4) Production of stretched film

The laminated film was uniaxially stretched at a free end (longitudinal direction) at 5.8 times at a stretching temperature of 160 캜 to obtain a stretched film. The thickness of the obtained stretched film was 28.5 mu m, and the thickness of the polyvinyl alcohol-based resin layer was 4.2 mu m.

(5) Production of polarizing laminated film

The stretched film was immersed in a warm bath at 60 DEG C for 60 seconds and then dipped in a dyeing solution at 30 DEG C for about 150 seconds as an aqueous solution containing iodine and potassium iodide to stain the polyvinyl alcohol resin layer, Of pure iodine solution. Next, the substrate was immersed in a crosslinking solution at 76 DEG C for 600 seconds as an aqueous solution containing boric acid and potassium iodide. Thereafter, the film was washed with pure water at 10 캜 for 4 seconds, and finally dried at 50 캜 for 300 seconds to obtain a polarizing laminated film.

The polarizing laminated film could be stably produced without any problems such as tearing of the film after stretching in each step until the polarizing laminated film was produced.

≪ Example 2 >

Butene copolymer was prepared as a rubber component by feeding ethylene monomer and 1-butene monomer in the second step of " (1) Production of base film " in Example 1, A base film having a thickness of 100 m was produced. The content of the ethylene unit in the copolymer was 35% by weight. The content of the ethylene unit in the entire resin was 30 wt% (i.e., the content of the ethylene-propylene copolymer was 42.9 wt% of the thermoplastic resin).

A polarizing laminated film was produced in the same manner as in Example 1 using the base film thus obtained. The polarizing laminated film could be stably produced without inconveniences such as tearing of the film after stretching in each step up to the production of the polarizing laminated film.

< Comparative Example  1>

A laminated film was produced in the same manner as in Example 1 except that a base film (without a rubber component) having a thickness of 100 mu m and made of a propylene homopolymer (Sumitomo Blend FLX80E4, melting point Tm = 163 DEG C) did. Then, the uniaxial stretching process was performed under the same conditions as in Example 1 to obtain a stretched film having a thickness of 30.1 占 퐉. The thickness of the polyvinyl alcohol-based resin layer in the stretched film was 4.5 탆.

< Comparative Example  2>

(Without rubber component) consisting of a propylene-ethylene random copolymer (Sumitomo Blend W151 manufactured by Sumitomo Chemical Co., Ltd., melting point Tm = 138 占 폚) containing about 5% by weight of an ethylene unit A laminated film was produced in the same manner as in Example 1 except for the above. Then, the uniaxial stretching process was performed under the same conditions as in Example 1 to obtain a stretched film having a thickness of 30.1 占 퐉. The thickness of the polyvinyl alcohol-based resin layer in the stretched film was 4.5 탆.

( Stretching  Measurement of tear strength of the film)

The tear strength of the stretched films obtained in the above Examples and Comparative Examples was measured by the following method. First, a cut is made parallel to the stretching direction using a cutter from the center of the short side edge of the stretched film (the center in the film width direction). Next, the stretched film was tentered from the starting point of this cut using a universal tensile tester ("Autograph AG-I" manufactured by Shimadzu Corporation), and the tear strength at that time was measured using the above apparatus. The film was heated at a speed of 300 mm / minute. Although the tear strength at each tearing distance (distance of the tear film from the starting point of the tear film) is obtained by this measurement, the tear strength of the film is stabilized at a certain tearing distance in the tear strength measurement using a tensile tester The tear strength is often high. Therefore, in this measurement, the average value of the tear strength in a region where the tear strength is stable, except for this portion, was calculated and used as the tear strength. The results are shown in Table 1.

As shown in Table 1, it was confirmed that the stretched films of Examples 1 and 2 had higher resistance to tearing in the stretching direction as compared with Comparative Examples 1 and 2.

[Production of Polarizer with Protective Film]

&Lt; Example 3 &gt;

Using each of the polarizing laminated films obtained in Examples 1 and 2, a polarizing plate with protective film was produced in the following procedure. First, a polyvinyl alcohol aqueous solution having a concentration of 3% by weight was prepared by dissolving a polyvinyl alcohol powder ("KL-318" manufactured by Kuraray Co., Ltd., average degree of polymerization: 1800) in hot water at 95 ° C. To the resulting aqueous solution was added 1 part by weight of a crosslinking agent ("Sumirez Resin 650" manufactured by Sumitomo Chemical Co., Ltd.) to 2 parts by weight of polyvinyl alcohol powder to prepare an adhesive solution.

Next, the adhesive solution was applied onto the polyvinyl alcohol-based resin layer of the polarizing laminated film, and then a protective film ("KC4UY" made by Konica Minolta Opt Co., Ltd.) made of triacetyl cellulose (TAC) A polarizing plate consisting of five layers of a protective film / adhesive layer / polarizer layer / primer layer / base film was obtained. The base film was peeled off from the obtained polarizing plate to produce a polarizing plate composed of four layers of a protective film / adhesive layer / polarizer layer / primer layer. The base film was easily peeled off.

10 base film, 10 base film stretched,
20 polyvinyl alcohol-based resin layer, 20 oriented polyvinyl alcohol-based resin layer,
30 polyvinyl alcohol-based resin layer dyed with a dichroic dye, 40 polarizer layers,
50 protective film, 100 laminated film,
200 stretched film, 300 dyed film,
400 crosslinked film, 500 polarized laminated film,
600 Polarizer with protective film.

Claims (7)

A method for producing a polarizing laminated film comprising a base film in which a rubber component is dispersed in a thermoplastic resin and a polarizer layer laminated on one side of the base film,
A step of forming a polyvinyl alcohol-based resin layer on one surface of a base film in which a rubber component is dispersed in a thermoplastic resin to obtain a laminated film,
A step of uniaxially stretching the laminated film to obtain a stretched film,
A step of staining the polyvinyl alcohol-based resin layer of the stretched film with a dichroic dye to obtain a dye film,
Immersing the polyvinyl alcohol-based resin layer of the dye film in a solution containing a crosslinking agent to crosslink the polyvinyl alcohol-based resin to form a polarizer layer from the polyvinyl alcohol-based resin layer to obtain a crosslinked film;
A step of drying the crosslinked film
&Lt; / RTI &gt; The method according to claim 1,
Wherein the thermoplastic resin is a polypropylene resin. The method according to claim 1,
Wherein the thermoplastic resin is a propylene homopolymer. The method according to any one of claims 1 to 3,
Wherein the rubber component comprises an ethylene unit. The method of claim 4,
Wherein the rubber component is a copolymer comprising an ethylene unit and at least one unit selected from the group consisting of a propylene unit, a butene unit, an octene unit and a styrene unit. The method according to claim 4 or 5,
Wherein the content of the ethylene unit in the copolymer is more than 10% by weight but less than 90% by weight. A polarizing laminated film comprising a base film in which a rubber component is dispersed in a thermoplastic resin and a polarizer layer having a thickness of 10 占 퐉 or less and laminated on one side of the base film.

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