KR101718935B1 - A polarizing plate - Google Patents

Abstract

The present invention relates to a polarizing plate, and more particularly, to a polarizing plate in which a protective film having a water vapor permeability of less than 5 g / m 2 · day at 40 ° C. and 90% RH is provided on both sides of a polarizer, 70 parts by weight of a polyvinyl alcohol-based adhesive, a protective film having a low moisture permeability can prevent moisture penetration into the polyvinyl alcohol-based adhesive and the polarizer, thereby improving the heat and humidity resistance of the polarizing plate, The present invention relates to a polarizing plate excellent in adhesion strength by using a polyvinyl alcohol-based adhesive.

Description

A POLARIZING PLATE

The present invention relates to a polarizing plate having a low moisture permeability and capable of enhancing moisture resistance and heat resistance of a polarizing plate by suppressing moisture penetration into a polyvinyl alcohol adhesive and a polarizer.

The polarizing plate is widely used as a polarizing light supplying element and a polarizing light detecting element in a liquid crystal display.

Generally, the polarizing plate has a structure in which a transparent protective film is laminated on both sides of a polarizer made of a polyvinyl alcohol (PVA) resin through an adhesive.

Polarizers are structures in which the molecular chains are oriented in a certain direction and include a structure containing an iodine compound or a dichroic polarizing material or a polyene formed by a dehydration reaction of a polyvinyl alcohol film or a dehydrochlorination reaction of a polyvinyl chloride (PVC) ) Structure. As the transparent protective film, acetic acid cellulose-based protective film typified by triacetylcellulose (TAC) is used.

However, the polarizing plate having triacetyl cellulose (TAC) as a protective film has insufficient durability against high temperature and high humidity, and when it is used under moist heat for a long time, there is a problem that the polarization performance is lowered and the cross section of the polarizer is easily peeled off.

In order to solve such a problem, JP-A-5-212828 proposes using a thermoplastic saturated norbornene resin as a protective film.

Japanese Patent Laid-Open No. 2000-321430 proposes using a cyclic olefin resin as a protective film and using a mixture of a polyvinyl alcohol system and a two-liquid type adhesive as an adhesive.

Japanese Patent Application Laid-Open No. 2000-321432 proposes bonding a protective film of a polarizer and a thermoplastic saturated norbornene resin with a polyurethane-based adhesive.

However, when the cycloolefin-based resin is adhered to the polarizer by such adhesives, the moisture penetrates into the adhesive and the polarizer through the protective film under high-temperature and high-humidity conditions, resulting in peeling between the polarizer and the protective film, there was.

An object of the present invention is to provide a polarizing plate capable of improving the heat and humidity resistance of a polarizing plate.

The present invention also relates to a polarizing film comprising a protective film having a water vapor permeability of less than 5 g / m 2 · day at 40 ° C. and 90% RH on both sides of a polarizer, And to provide a polarizing plate bonded with a bonding agent.

1. A protective film having a water vapor permeability of less than 5 g / m < 2 > / day at 40 DEG C and 90% RH on both surfaces of a polarizer, wherein the protective film comprises a poly (vinyl alcohol) Polarizer laminated with a vinyl alcohol-based adhesive.

2. The protective film according to item 1, wherein the moisture permeability at 40 ° C and 90% RH is less than 5 g / m 2 · day is selected from the group consisting of a polyester resin, an acrylic resin, a polyolefin resin and a norbornene resin having no heteroatom Lt; / RTI >

3. The water-soluble cross-linking agent according to item 1, wherein the water-soluble cross-linking agent is an alkylene diamine, isocyanate, epoxy, monoaldehyde, dialdehyde, amino-formaldehyde resin, divalent or trivalent metal salt or metal oxide ≪ / RTI >

4. The polarizer of claim 1, wherein the water-soluble crosslinking agent is contained in an amount of 10 to 30 parts by weight.

The polarizing plate according to the present invention has an effect of improving the resistance to humidity and humidity by suppressing the penetration of water with a polyvinyl alcohol-based adhesive by using a protective film having a moisture permeability of less than 5 g / m 2 일 at 40 캜 and 90% RH.

In addition, the polarizing plate according to the present invention is excellent in adhesion and water resistance as well as in heat and humidity resistance, and is advantageously used in a high temperature and high humidity environment.

Fig. 1 shows a method for evaluating the resistance to humidity and humidity of a polarizing plate according to the present invention.

The polarizing plate of the present invention is characterized in that a protective film having a moisture permeability of less than 5 g / m < 2 > days at 40 DEG C and 90% RH is formed on both surfaces of a polarizer by using a polyvinyl alcohol containing 5 to 70 parts by weight of a water soluble crosslinking agent per 100 parts by weight of the polyvinyl alcohol- And is bonded with an alcohol-based adhesive.

Hereinafter, the present invention will be described in detail.

A polarizer is one in which a dichroic dye is adsorbed and oriented on a stretched polyvinyl alcohol-based film. The polyvinyl alcohol-based resin constituting the polarizer can be produced by saponifying a polyvinyl acetate-based resin. Examples of the polyvinyl acetate resin include copolymers of vinyl acetate and other monomers copolymerizable therewith, as well as polyvinyl acetate, which is a homopolymer of vinyl acetate. Specific examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, unsaturated sulfonic acids, olefins, vinyl ethers, and acrylamides having an ammonium group. In addition, the polyvinyl alcohol-based resin may be modified. For example, polyvinyl formal or polyvinyl acetal modified with aldehydes may also be used. The degree of saponification of the polyvinyl alcohol-based resin may be generally 85 to 100 mol%, preferably 98 mol% or more. The polymerization degree of the polyvinyl alcohol-based resin is usually 1,000 to 10,000, preferably 1,500 to 5,000.

In the polarizing plate of the present invention, a protective film having low moisture permeability is bonded to both sides of the polarizer.

The protective film refers to a film for protecting the polarizer because the polarizer is mechanically weak. When the retardation film serves as a polarizer protective film, the retardation film is also considered to belong to the protective film of the present invention.

The protective film has a different moisture permeability depending on the type of resin, and a film excellent in transparency, mechanical strength, thermal stability, moisture barrier property and isotropy can be used.

In the present invention, a protective film having a moisture permeability of less than 5 g / m < 2 > days at 40 DEG C and 90% RH is bonded to both sides of the polarizer.

The protective film having a moisture permeability of less than 5 g / m 2 · day at 40 ° C. and 90% RH may be selected from the group consisting of polyester resin, acrylic resin, polyolefin resin and norbornene resin having no heteroatom. Hetero atoms refer to nitrogen, oxygen, sulfur, phosphorus, and the like.

Specifically, examples of the polyester-based resin include resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate.

Examples of the acrylic resin include resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate.

Homopolymers or copolymers of? -Olefins such as polyethylene, polypropylene, ethylene-propylene copolymer or poly-4-methylpentene-1 of 1 to 6 carbon atoms, and the like.

The norbornene resin can be obtained by, for example, a resin obtained by adding hydrogen (co) polymer of a ring-opened norbornene monomer to the polymer after performing modification such as addition of maleic acid or addition of cyclopentadiene; A resin obtained by addition polymerization of a norbornene monomer; A resin obtained by addition polymerization of a norbornene monomer, ethylene or an? -Olefin and a polyolefin monomer; And resins obtained by addition polymerization of norbornene monomers and cyclic olefin monomers such as cyclopentene, cyclooctene or 5,6-dihydrodicyclopentadiene, and the like.

The present invention is limited to a norbornene resin having no heteroatom in its molecule in these norbornene resins.

The protective film may contain one or more suitable additives. Specific examples of the additives include an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring inhibitor, a flame retardant, a nucleating agent, an antistatic agent and a colorant.

Further, the protective film may be subjected to known surface treatments such as saponification treatment, corona treatment, plasma treatment, and easy adhesion layer treatment to facilitate adhesion with the polarizer.

The polarizer of the present invention and the protective film having low moisture permeability are bonded by a polyvinyl alcohol adhesive.

The polyvinyl alcohol-based adhesive includes a polyvinyl alcohol-based resin and a water-soluble cross-linking agent.

The polyvinyl alcohol-based resin, which is one of the components of the adhesive, is a vinyl-based polymer resin and is excellent in adhesion to a polyvinyl alcohol-based polarizer. Partially saponified polyvinyl alcohol; Fully saponified polyvinyl alcohol resin; A modified polyvinyl alcohol resin such as a carboxy group denatured polyvinyl alcohol resin, an acetoacetyl group denatured polyvinyl alcohol resin, a methylol group denatured polyvinyl alcohol resin and an amino group denatured polyvinyl alcohol resin can be used. Of these, The polyvinyl alcohol resin contains a highly reactive functional group, which is preferable in terms of improvement in durability.

The average degree of polymerization and the degree of saponification of the polyvinyl alcohol-based resin are not particularly limited, but it is preferable that the average degree of polymerization is 100 to 5,000, preferably 1,000 to 4,000, and the average degree of saponification is 85 to 100 mol% , Preferably 90 to 100 mol%.

As the adhesive, a polyvinyl alcohol-based adhesive composition in the form of an aqueous solution is used.

The polyvinyl alcohol resin (based on solid content) in the adhesive composition is preferably contained in an amount of 1 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of water. When the content is less than 1 part by weight, the adhesiveness is poor. When the content is more than 10 parts by weight, the viscosity of the adhesive is increased and the processability is lowered.

The crosslinking agent is not particularly limited as long as it is a known crosslinking agent for improving the water resistance and durability of the adhesive and is a crosslinking agent for the polyvinyl alcohol-based adhesive. For example, a compound having two or more functional groups having reactivity with a polyvinyl alcohol-based resin can be used. Specifically, alkylenediamines having two alkylene groups and amino groups such as ethylenediamine, triethylenamine, and hexamethylenediamine; Tolylene diisocyanate, hydrogenated tolylene diisocyanate, trimethylene propane tolylene diisocyanate adduct, triphenylmethane triisocyanate, methylene bis (4-phenylmethane triisocyanate), isophorone diisocyanate and keto oxime block or phenol block Isocyanate system such as cargo; Epoxy compounds such as ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, trimethylol propane triglycidyl ether, diglycidyl aniline and diglycidyl amine; Monoaldehyde-based ones such as formaldehyde, acetaldehyde, propionaldehyde and butylaldehyde; Dialdehyde systems such as glyoxal, malondialdehyde, succinic acid dialdehyde, glutaraldehyde, maleindialdehyde and phthalaldehyde; Amino-formaldehyde resin systems such as methylol urea, methylol melamine, alkylated methylol urea, alkylated methylol melamine, acetoguanamine, condensates of benzoguanamine and formaldehyde; A salt of a divalent or trivalent metal such as sodium, potassium, magnesium, calcium, aluminum, iron and nickel, and an oxide of a metal.

The epoxy cross-linking agent can be obtained by, for example, reacting epichlorohydrin with a polyamide polyamine obtained by the reaction of a polyalkylene polyamine such as diethylene triamine or triethylene tetramine with a dicarboxylic acid such as adipic acid, Polyamide epoxy resin. As such a commercially available polyamide epoxy resin, Sumirez resin 650, Sumirez resin 675 (Sumitomo Mogaka Co., Ltd.), WS-525 (Nippon PMC Co., Ltd.) and the like may be used.

The crosslinking agent (based on the solid content) is contained in an amount of 5 to 70 parts by weight based on 100 parts by weight of the polyvinyl alcohol-based resin (based on the solid content), more preferably 10 to 30 parts by weight in order to maintain excellent moisture resistance and adhesion. When the content is less than 5 parts by weight, the water resistance of the adhesive is not sufficiently manifested, and when it exceeds 70 parts by weight, the adhesion between the polarizer and the protective film tends to deteriorate.

The composition for forming an adhesive of the present invention may further comprise a water-soluble catalyst. Examples of the water-soluble catalyst include piperazine, pyrrolidine, zinc chloride, cobalt chloride, magnesium chloride, ammonium chloride, barium oxide, alkyl iodide and the like. The composition for forming an adhesive may further include conventionally known additives such as a defoaming agent, a leveling agent, a plasticizer, a silane coupling agent, an antistatic agent, a fine particle and the like within a range not to impair the effect of the present invention.

The composition for forming an adhesive preferably has a viscosity of 3 to 25 mPa · sec at 20 ° C. When the viscosity is less than 3 mPa · sec, sufficient water resistance at room temperature is difficult to develop, and when it exceeds 25 mPa · sec, the optical characteristics of the polarizing plate are likely to be deteriorated.

A composition for forming an adhesive for bonding a polarizer and a protective film is applied to either side of the polarizer and the protective film or applied to both. The coating operation is not particularly limited, and various methods such as a roll method, a spray method, a dipping method and the like can be used. It is preferable to apply the adhesive so that the thickness of the adhesive formed after drying is 10 to 5,000 nm, preferably 30 to 600 nm, considering the content of the solid content. When the thickness is less than 10 nm, the adhesive force may be poor. When the thickness exceeds 5,000 nm, the uniform application of the adhesive may be difficult or the thickness may become uneven, resulting in poor appearance. Also, a tension may be applied to the protective film when the polarizer and the protective film are bonded, but it is preferable that the tensile force is as low as possible since the protective film deforms.

After the adhesive is applied, the polarizer and the protective film are bonded together by a roll laminator or the like. After bonding the polarizer and the protective film, a drying process is performed to form an adhesive composed of a coating and drying layer.

The polarizing plate to which the polarizer and the protective film are bonded is subjected to a drying process. Examples of the drying process include hot air drying using hot air at a drying temperature of 40 to 100 占 폚, preferably 60 to 100 占 폚. The drying time is 20 to 1,200 seconds, but the drying time is preferably as short as possible in order to improve the productivity. After hot air drying, it is preferable to cure at room temperature or higher than room temperature, for example, at 20 to 50 DEG C for 12 to 600 hours.

The polarizing plate of the present invention can be further laminated with a surface treatment layer such as a hard coat layer, an antireflection layer or an anti-adhesion layer, a diffusion layer, an anti-glare layer, etc. without departing from the object of the present invention.

The hard coat treatment is carried out in order to prevent the surface of the polarizing plate from being damaged. For example, a cured coated film excellent in hardness, sliding property and the like formed by a system in which a suitable ultraviolet ray hardening resin such as silicone resin is added to the surface of a protective film have. The antireflection layer is also formed for the purpose of preventing external light from being reflected on the surface of the polarizing plate. The antireflection layer can be achieved by forming an antireflection film according to the prior art. And also to prevent the protective film from adhering to the adjacent layer. In addition, the anti-glare layer is performed for the purpose of preventing the visual perception of light transmitted through the polarizer from being hindered by the external light reflected on the polarizing plate surface. Examples thereof include a roughening system using sandblasting, embossing, The micro concavo-convex structure can be imparted to the surface of the protective film by a system or the like. The transparent particles include particles made of silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, antimony oxide and the like, with an average particle size of 0.5 to 20 탆. The transparent particles may also be organic fine particles made of inorganic fine particles having conductivity or crosslinked or non-crosslinked granular polymers. The transparent particles are contained in an amount of 2 to 70 parts by weight, preferably 5 to 50 parts by weight, based on 100 parts by weight of the resin. The anti-glare layer containing transparent fine particles may be provided as the protective film itself or as a coating layer applied to the surface of the protective film or the like. The anti-glare layer can also act as a diffusion layer (such as a viewing angle compensating function) that widens the viewing angle by diffusing the light transmitted through the polarizing plate.

The polarizing plate manufactured by the manufacturing method of the present invention can be used in a liquid crystal display device. The liquid crystal display device can be manufactured by peeling off the peelable release film of the polarizer with the adhesive and then attaching the adhesive layer to the liquid crystal panel.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

Production Example 1: Polarizer Production

A PVA film having a degree of saponification of 2,400 and a degree of saponification of 99.9 mol% or more was uniaxially stretched by a dry method about 5 times in a dry state and immersed in distilled water at 60 DEG C for 1 minute while maintaining the tension, And immersed for 60 seconds in an aqueous solution at 28 占 폚 in which the weight ratio of distilled water was 0.05 / 5/100. Thereafter, the substrate was immersed in an aqueous 72 ° C aqueous solution having a weight ratio of potassium iodide / boric acid / distilled water of 8.5 / 8.5 / 100 for 300 seconds, washed with distilled water at 26 ° C for 20 seconds and dried at 65 ° C to remove iodine Adsorbed polarizers were prepared.

Production Example 2: Production of PVA-based adhesive composition

An acetoacetyl modified polyvinyl alcohol resin (Kosenol Z200, Nippon Synthetic Chemical Industry Co., Ltd.) having a saponification degree of 99.2 mol% was dissolved in water to prepare an aqueous solution having a solid content of 5 wt%. The acetoacetyl group-modified polyvinyl alcohol resin aqueous solution and glyoxal crosslinking agent were mixed in a weight ratio of 100: 10 based on the solid content. Subsequently, the composition was diluted with water such that the content of the acetoacetyl group-modified polyvinyl alcohol resin (based on the solid content) was 3 parts by weight to prepare an adhesive composition.

Production Example 3: Preparation of protective film

Corona discharge treatment of 0.3 to 1.5 kV was performed on the joint surface of the protective film of Table 1 below.

Examples 1 to 5 and Comparative Examples 1 to 7: Preparation of Polarizing Plate

The polyvinyl alcohol-based adhesive composition of Production Example 2 was applied between one side of the PVA polarizer produced in Production Example 1 and one side of the protective film 1 (Table 1), and between the other side and the protective film 2 (Table 1) Using a postnip roll. The bonded polarizing plate was dried for 5 minutes in a hot-air dryer at 80 ° C to prepare a polarizing plate,

Test Example

The physical properties of the polarizing plates prepared in the above Examples and Comparative Examples were measured by the following methods, and the results are shown in Table 1 below.

[Measurement of physical properties]

1. Water vapor permeability

Measurement is carried out using a moisture permeability meter (PERMATRAN-W 3/33, MOCON).

2. Humidity Resistance

The polarizing plate was allowed to stand for 24 hours under an environment of 23 ° C and a relative humidity of 55%, and then tested for resistance to humidity and humidity.

The polarizing plate was cut into a rectangular shape of 5 cm x 2 cm with the absorption axis (stretching direction) of the polarizing plate as the long side to produce a sample, and the dimension in the long side direction was measured accurately. The sample exhibits uniform color uniformity over the entire surface due to iodine adsorbed on the polarizer.

As shown in Fig. 1, (A) shows that the short side of the sample 1 is gripped by the grip portion 5 before immersion in the hot water, (B) Showing a shrunk sample 4 after immersing about 80% in the longitudinal direction in a hot water tank at 60 캜 for 4 hours.

When the immersion is completed, the sample (4) is taken out of the water tank to wipe the moisture, and the degree of shrinkage of the polarizer is measured. Specifically, the distance from the end 1a of the protective film at the center of the short side of the sample 1 to the end of the shrunk polarizer 4 was measured, and this was taken as the shrinkage length. In (B), the polarizer 4 located at the center of the polarizing plate shrinks due to hot water immersion, and a region 2 in which the polarizer 4 is not present between the two protective films is formed. Further, iodine elutes from the peripheral portion of the polarizer 4 which is in contact with the hot water due to the hot water immersion, and a portion 3 in which the color is missing in the peripheral portion of the sample 1 is generated. The degree of discoloration was measured as the distance from the end of the shrunk polarizer 4 at the center of the short side of the sample 1 to the region where the color unique to the polarizing plate remained, and this was taken as the iodine drop length.

The total erosion length X means the total erosion length X from the end 1a of the sample 1 at the center of the short side of the sample 1 to the total length of the sample 1 from the end 1a of the sample 1, This is the distance to the area where the color remains. The smaller the shrinkage length, the iodine dropout length and the total erosion length (X), the higher the wet heat resistance in the presence of water.

?: Total erosion length (X) < 0.3 mm

?: 0.3 mm? Total erosion length (X) < 0.6 mm

?: 0.6 mm? Total erosion length (X) <1 mm

X: 1 mm? Total erosion length (X)

3. Adhesiveness

The degree of peeling and degree of breakage were observed while peeling off between the polarizer of the polarizing plate and the protective film by hand, and evaluated according to the following criteria. At this time, the polarizer and the protective film are not peeled off from each other, but are more excellent in adhesion as they are broken.

?: Not peeled and damaged (good).

△: The area to be peeled is large and some are broken (usually).

X: peeled and hardly broken (poor).

division
Protective film 1
Protective Film 2 glue
(Parts by weight) Properties Kinds Moisture permeability
(g / m ² · day) Kinds Moisture permeability
(g / m ² · day) PVA resin Cross-linking agent Humidity Durability Adhesiveness Other Example 1 Zeo Noah 3 Zeo Noah 3 3 10 ◎ ○ Example 2 Polypropylene 2 Polypropylene 2 3 10 ◎ ○ Example 3 Zeo Noah 3 Polypropylene 2 3 10 ◎ ○ Example 4 Zeo Noah 3 PET 4.2 3 10 ◎ ○ Example 5 PMMA 4.8 PMMA 4.8 3 10 ◎ ○ Example 6 Zeo Noah 3 Zeo Noah 3 3 30 ◎ ○ Example 7 Zeo Noah 3 Zeo Noah 3 3 6 ○ ○ Example 8 Zeo Noah 3 Zeo Noah 3 3 65 ○ ○ Comparative Example 1 Aton 74.6 Aton 74.6 3 10 △ ○ Comparative Example 2 TAC 500 TAC 500 3 10 × ○ Comparative Example 3 Zeo Noah 3 TAC 500 3 10 △ ○ Comparative Example 4 Zeo Noah 3 Zeo Noah 3 0.5 10 △ × Comparative Example 5 Zeo Noah 3 Zeo Noah 3 12 10 ◎ △ Comparative Example 6 Zeo Noah 3 Zeo Noah 3 3 One △ ○ Gelling Comparative Example 7 Zeo Noah 3 Zeo Noah 3 3 100 - - Viscosity is not maintained Zeonoa (trade name): Norbornene series, Japan Xeon Co., Ltd.
PET: Polyethylene terephthalate
PMMA: polymethyl methacrylate
Atton (trade name): a norbornene system containing a hetero atom, JSR Corporation
TAC: triacetylcellulose
Measured at 40 ° C and 90% RH
The PVA resin content of the adhesive composition is in the range of &lt; RTI ID = 0.0 &gt;
The amount of the crosslinking agent in the adhesive composition is preferably in the range of 100 parts by weight based on the PVA resin (based on the solids content)

As shown in Table 1, the polarizing plates of Examples 1 to 5, in which a protective film having a low moisture permeability was bonded to a polarizer by a polyvinyl alcohol-based adhesive according to the present invention, were found to be superior in wet heat resistance and adhesiveness as compared with Comparative Examples 1 to 7 I could.

Comparative Examples 1 to 3, in which a protective film having a moisture permeability of at least 5 g / m 2 · day (40 ° C. and 90% RH) or more was bonded to at least one surface of the polarizer, exhibited a low resistance to moisture and humidity. When the composition of the polyvinyl alcohol adhesive deviates from the present invention , It was confirmed that Comparative Examples 4 to 7 had low resistance to wet heat resistance or adhesiveness. In Comparative Example 7, since the viscosity of the adhesive is not maintained, adhesiveness of the adhesive layer of the polarizing plate is lowered, so that there is a problem that it is difficult to measure the physical properties.

1: Sample 1a: End of protective film
2: area where no polarizer exists
3: Sample missing color
4: Polarizer
5:

Claims (4)

A protective film selected from the group consisting of a polyester resin, an acrylic resin and a polyolefin resin and having a water vapor permeability of less than 5 g / m &lt; 2 &gt; days at 40 DEG C and 90% RH on both sides of the polarizer, A polyvinyl alcohol-based adhesive comprising 1 to 10 parts by weight of a polyvinyl alcohol resin (based on solid content) and 5 to 70 parts by weight of a water-soluble crosslinking agent based on 100 parts by weight of a polyvinyl alcohol-based resin (solid basis) .
delete The water-soluble crosslinking agent according to claim 1, wherein the water-soluble crosslinking agent is selected from the group consisting of alkylenediamine-based, isocyanate-based, epoxy-based, monoaldehyde-based, dialdehyde-based, amino- Polarizer.
The polarizing plate according to claim 1, wherein the water-soluble crosslinking agent is contained in an amount of 10 to 30 parts by weight.

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