KR101933275B1 - Polarizing plate and display device comaprising the same - Google Patents

Abstract

The present invention relates to a polarizer, a protective film provided on one surface of the polarizer, a first pressure-sensitive adhesive layer provided on the other surface of the polarizer, a second pressure-sensitive adhesive layer provided on the protective film, And a difference (ΔG _{'85 ° C.} ) between the storage modulus of the first pressure-sensitive adhesive layer and the storage elastic modulus of the second pressure-sensitive adhesive layer at 85 ° C. represented by the following formula (1) is 50,000 to 400,000 Pa .
(1):? G _{'85 ° C} = G' ₁ , _{85 ° C} - G ' ₂ , _{85 ° C}
The formula (1) in G _{'1, 85 ℃} is 85 ℃, 10 ^-3 ~ 10 ^2, and the storage modulus value of the first pressure-sensitive adhesive layer as measured at a frequency in rad / s, the G' _{2, 85 ℃} is The storage modulus value of the second pressure-sensitive adhesive layer measured at 85 ° C and a frequency of 10 ^-3 to 10 ² rad / s.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate,

The present invention relates to a polarizing plate and a display device including the same. More particularly, the present invention relates to a polarizing plate capable of effectively suppressing cracking of a polarizer, lifting of a reflective polarizing member, and bending phenomenon under high temperature and / or high humidity conditions, and a display apparatus including the polarizing plate will be.

2. Description of the Related Art [0002] As display devices have become slimmer, a polarizing plate applied to a display device is required to be thin. Accordingly, a single-sided polarizing plate has been proposed in which a protective film attached to one surface of a polarizer is omitted and a pressure-sensitive adhesive layer is directly formed on the polarizer. However, such a single-surface polarizer has a problem that cracks of the polarizer are generated in a high-temperature and / or high-humidity environment compared with a polarizer including a protective film on both sides of the polarizer. This is due to the omission of the protective film, which causes thermal decomposition of the polarizer in a high temperature and / or high humidity environment, increases the amount of water introduced into the polarizer or outflowed from the polarizer, and causes water to flow into the polymer chain, .

In order to solve the above problems, WO2009 / 145150 (Patent Document 1) discloses a technique for suppressing cracking of a polarizer by applying a protective layer having a tensile modulus of 100 MPa or more between a polarizer and a pressure- . However, in the case of the above technique, a protective layer is formed in place of a protective film, which limits the thickness of the protective layer, and a separate process is required to form the protective layer.

On the other hand, in order to prevent polarizer cracking, it is possible to consider improving the moisture barrier property by increasing the storage modulus of the pressure-sensitive adhesive layer adhered to the polarizer. In this case, panel bending occurs when the polarizing plate is attached to the panel , Which causes defects such as light leakage.

In recent years, a functional film such as a retardation film or a brightness enhancement film is integrally incorporated in a polarizing plate in order to improve optical properties of a display device. However, when the conventional single-sided polarizing plate is used in combination with such a functional film, there is a problem that the adhesive force of the pressure-sensitive adhesive layer is lowered under high temperature and high humidity, and the functional film is peeled or lifted. Resulting in defects such as light leakage.

Therefore, it is required to develop a one-sided polarizing plate capable of minimizing panel warpage without occurrence of polarization cracking in a high-temperature and high-humidity environment, and no lifting or peeling phenomenon when the functional film is laminated.

It is an object of the present invention to provide a polarizer excellent in durability without causing cracking of a polarizer under severe conditions such as high temperature and / or high humidity.

Another object of the present invention is to provide a polarizing plate which has excellent adhesion even under high temperature and high humidity conditions and does not cause lifting or peeling of the reflection type polarizing member even if the reflection type polarizing member is integrally formed.

It is still another object of the present invention to provide a polarizing plate capable of minimizing panel warping at the time of attaching the panel.

It is still another object of the present invention to provide a display device including the polarizing plate of the present invention having excellent reliability and optical characteristics.

According to an aspect of the present invention, there is provided a polarizer comprising a polarizer, a protective film provided on one surface of the polarizer, a first pressure-sensitive adhesive layer provided on the other surface of the polarizer, a second pressure- (? G _{'85 ° C} ) between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at 85 ° C. represented by the following formula (1) is 50,000 to 400,000 Pa Thereby providing a polarizing plate.

(1):? G _{'85 ° C} = G' ₁ , _{85 ° C} - G ' ₂ , _{85 ° C}

The formula (1) in G _{'1, 85 ℃} is 85 ℃, 10 ^-3 ~ 10 ^2, and the storage modulus value of the first pressure-sensitive adhesive layer as measured at a frequency in rad / s, the G' _{2, 85 ℃} is Is the storage modulus value of the second pressure-sensitive adhesive layer measured at 85 DEG C and a frequency of 10 ^-3 to 10 ² rad / s.

In another aspect, the present invention provides a display device including such a polarizing plate.

In another aspect, the present invention provides a liquid crystal display comprising: a liquid crystal panel including an upper substrate, a lower substrate, and a liquid crystal cell disposed between the upper substrate and the lower substrate; A backlight unit disposed below the lower substrate; A first polarizer disposed on an upper surface of the upper substrate; And a second polarizer disposed on a lower surface of the lower substrate, wherein the second polarizer is the polarizer of the present invention.

The polarizing plate according to the present invention uses the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer having different storage elastic moduli at high temperatures, and thus can prevent the polarizer cracks in the high temperature and / or high humidity environment, lifting / peeling of the reflective polarizing member, So that the occurrence of warpage can be minimized.

In addition, the polarizing plate according to the present invention minimizes panel warpage when a panel is applied, thereby realizing a display device having excellent reliability and optical characteristics.

1 is a view for explaining a polarizing plate according to an embodiment of the present invention.
2 is a view for explaining a structure of a display device according to an embodiment of the present invention.

Hereinafter, the present invention will be described more specifically with reference to the accompanying drawings. It is to be understood, however, that the following drawings are provided only to facilitate understanding of the present invention, and the present invention is not limited to the following drawings. Also, the shapes, sizes, ratios, angles, numbers and the like disclosed in the drawings are exemplary and the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

If the positional relationship between two parts is explained by 'on', 'on top', 'under', 'next to', etc., 'right' or 'direct' One or more other portions may be located.

The positional relationships such as "upper", "upper", "lower", "lower" and the like are described based on the drawings, but do not represent an absolute positional relationship. That is, the positions of 'upper' and 'lower' or 'upper surface' and 'lower surface' may be changed according to the position to be observed.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

As used herein, "(meth) acrylic" is a collective term for acrylic and methacrylic. For example, (meth) acrylate includes methacrylate and acrylate, and (meth) acrylic acid includes methacrylic acid and acrylic acid.

In the present specification, " X to Y " representing the range means " X or more and Y or less ".

The inventors of the present invention have conducted research to develop a polarizing plate capable of minimizing panel warpage at the time of attaching a panel without causing polarization cracks and lifting of the reflective polarizing member even under high temperature and / or high humidity conditions, / The first pressure-sensitive adhesive layer / the polarizer / the protective film / the second pressure-sensitive adhesive layer are stacked in this order and the high-temperature storage modulus of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer satisfy a specific relationship, the above- And completed the present invention.

1 shows a polarizing plate according to an embodiment of the present invention. Hereinafter, a polarizing plate according to the present invention will be described with reference to FIG.

1, the polarizing plate 10 of the present invention includes a polarizer 11, a protective film 13, a first pressure sensitive adhesive layer 15, a second pressure sensitive adhesive layer 17 and a reflective polarizing member 19, .

The polarizing plate 10 according to an embodiment of the present invention includes a polarizer 11, a protective film 13 provided on one surface of the polarizer 11, A second pressure sensitive adhesive layer 17 provided on the protective film 13 and a reflective polarizing member 19 provided on the first pressure sensitive adhesive layer 15. The first pressure sensitive adhesive layer 15 is formed on the first pressure sensitive adhesive layer 15.

The polarizing plate 10 of the present invention has a difference (ΔG _{'85 ° C.} ) between the storage modulus of the first pressure-sensitive adhesive layer at 85 ° C. expressed by the following formula (1) and the second pressure-sensitive adhesive layer of 50,000 to 400,000 Pa, Is set to be in the range of 50,000 to 350,000 Pa, and more preferably in the range of 50,000 to 250,000 Pa.

(1):? G _{'85 ° C} = G' ₁ , _{85 ° C} - G ' ₂ , _{85 ° C}

The formula (1) in G _{'1, 85 ℃} is the storage modulus value of the first pressure-sensitive adhesive layer 15 is measured at a frequency of ^{85 ℃, 10 -3 ~ 10 2} rad / s, the G' _{2, 85 ℃} The Is the storage modulus value of the second pressure-sensitive adhesive layer (17) measured at 85 DEG C and a frequency of 10 ^-3 to 10 ² rad / s.

Specifically, the above G ' ₁ , _{85 ° C and} G' ₂ , _{85 ° C} It is measured by the following method.

First, a pressure-sensitive adhesive composition for forming a pressure-sensitive adhesive layer is applied to a polyethylene terephthalate film as a release film and dried at 90 DEG C for 4 minutes to form a pressure-sensitive adhesive layer having a thickness of 20 mu m. Then, the pressure-sensitive adhesive layer is cured by keeping it at 35 DEG C and 45% relative humidity for 3 days, and then a plurality of cured pressure-sensitive adhesive layers are laminated to produce a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer having a thickness of 1 mm. Then, the pressure-sensitive adhesive sheet was cut into a circle having a diameter of 8 mm to prepare a specimen. The specimen was measured at a temperature of 85 ° C and a frequency of 10 ^-3 to 10 ² rad / s using a storage elasticity meter (MCR-501, Physica) Frequency sweep test is performed to measure the storage elastic modulus. The minimum value of the measured storage modulus is used as the storage modulus value.

When ΔG _{'85 ° C.} is within the above range, cracks of the polarizer cracks and lifting of the reflective polarizing member do not occur even in a high temperature and high humidity environment, and the panel warpage can be minimized when the polarizing plate is attached to the panel.

Hereinafter, each component of the polarizer according to one embodiment of the present invention will be described in more detail.

Polarizer

The polarizer 11 is for making natural light or any polarized light into polarized light that vibrates in a specific direction. As the polarizer 11, polarizers commonly used in the art can be used without limitation. For example, the polarizer may be a polyvinyl alcohol polarizing film prepared by dying a dichroic dye or iodine on a polyvinyl alcohol film, followed by stretching, or a polyene polarizer obtained by dehydrating a polyvinyl alcohol film.

Protective film

The protective film 13 is provided on one surface of the polarizer 11 for protecting and supporting the polarizer 11. [ As the protective film 13, protective films commonly used in the art can be used without limitation. Specifically, the protective film 13 may be an optically transparent resin such as a cyclic olefin polymer including a cyclic olefin polymer (COP), a poly (meth) acrylate, a poly A polyether sulfone type, a polysulfone type, a polyamide type, a polyimide type, a polyolefin type, a polyamide type, a polyamide type, and a polyolefin type, including a polyester type and triacetyl cellulose (TAC) including a carbonate type and polyethylene terephthalate , A polyarylate resin, a polyvinyl alcohol resin, a polyvinyl chloride resin, and a polyvinylidene chloride resin may be used.

Meanwhile, although not shown in the figure, the protective film 13 may be attached to the polarizer 11 via an adhesive layer. The adhesive layer may be formed by adhesives well known in the art, and may be suitably selected in consideration of the material of the protective film 13 and the like. For example, when a TAC is used as a protective film, an aqueous adhesive such as a polyvinyl alcohol adhesive can be used. When a COP film is used as a protective film, a photo-curable or thermosetting adhesive such as an acrylic adhesive or an epoxy adhesive Can be used.

The first pressure-

The first pressure sensitive adhesive layer 15 is for laminating a reflective polarizing member 19 to be described later on the polarizer 11 and is provided on the other surface of the polarizer 11, On the other side.

The first pressure sensitive adhesive layer 15 has a storage modulus (G ' ₁ , _{85 ° C} ) measured at 85 ° C and 10 ^-3 to 10 ² rad / s at a frequency of 100,000 Pa to 500,000 Pa, Pa to 450,000 Pa, more preferably 100,000 Pa to 400,000 Pa. When the storage modulus value of the first pressure-sensitive adhesive layer 15 at 85 캜 satisfies the above range, it is possible to maintain a low water permeability even in a high temperature environment, and the generation of cracks in the polarizer due to rapid inflow and outflow of water can be suppressed as much as possible .

The first pressure-sensitive adhesive layer may have a peel strength of 1000 gf / inch or more, preferably 1000 to 2000 gf / inch, more preferably 1000 to 1500 gf / inch, as measured through a 180 ° peel test . When the peeling strength of the first pressure-sensitive adhesive layer satisfies the above-described range, the reflective polarizing member can be firmly adhered without being peeled or lifted even in a high temperature and high humidity environment.

The peel strength of the first pressure-sensitive adhesive layer was measured in a texture analyzer peel test mode, and the polarizing plate laminated in the order of the reflective polarizing member / first pressure-sensitive adhesive layer / polarizer / protective film / second pressure-sensitive adhesive layer was cut into a size of 210 mm × 25 mm , A second pressure sensitive adhesive layer was attached and fixed on a glass substrate having a size of 30 mm x 130 mm, and then the reflection type polarizing member and the first pressure sensitive adhesive layer were separated with a knife. Thereafter, the reflective polarizing member was tightly fixed to the jig of a texture analyzer, The reflective polarizing members were pulled at angles of 180 ° and 300 mm / min to peel off the first pressure-sensitive adhesive layer and the polarizer.

On the other hand, the thickness of the first pressure-sensitive adhesive layer is not limited to 50 탆 or less, preferably 1 to 30 탆, 5 to 10 [micro] m. When the thickness of the first pressure sensitive adhesive layer satisfies the above range, the effect of the present invention can be further improved.

For example, the first pressure sensitive adhesive layer may include, but is not limited to, (A) a (meth) acrylic polymer, (B) an isocyanate curing agent, (C) a carbodiimide curing agent, (D) (E) a first pressure-sensitive adhesive composition comprising a tackifier.

According to one embodiment, the first pressure sensitive adhesive composition comprises 100 parts by weight of (A) a (meth) acrylic polymer, (B) 0.01 to 20 parts by weight of an isocyanate curing agent, (C) 0.01 to 5 parts by weight of a carbodiimide curing agent , (D) 0.05 to 5 parts by weight of a silane coupling agent, and (E) 1 to 10 parts by weight of a tackifier.

Hereinafter, each component of the first pressure sensitive adhesive composition will be described in more detail.

(A) a (meth) acrylic polymer

The (meth) acrylic polymer is formed by polymerizing one or more (meth) acrylic monomers, and (meth) acrylic polymers or copolymers for pressure-sensitive adhesives well known in the art can be used without limitation.

(A-2) a vinyl monomer having a hydroxyl group, (a-3) a vinyl monomer having a carboxyl group and (a-2) a vinyl monomer having a carboxyl group, 4) a monomer mixture containing at least one of vinyl monomers having an aromatic ring.

The vinyl monomer having the alkyl group (a-1) may include a non-cyclic (meth) acrylic acid ester having a linear or branched alkyl group having 1 to 20 carbon atoms. Examples of the vinyl monomer having an alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, Acrylate, isobutyl (meth) acrylate, isobutyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, Acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate or lauryl (meth) acrylate alone or in combination.

The vinyl-based monomer having a hydroxyl group as the (a-2) may be a (meth) acrylic acid ester having a hydroxyl group. The (meth) acrylic acid ester having a hydroxyl group may be a (meth) acrylic acid ester having at least one hydroxyl group and an alkyl group having 1 to 20 carbon atoms in its terminal or structure.

Specifically, examples of the vinyl monomer having a hydroxyl group as the (a-2) monomer include 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxypropyl (Meth) acrylate, 2-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 1,4-cyclohexanedimethanol mono (Meth) acrylate, diethylene glycol mono (meth) acrylate, 1,6-hexanediol mono (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol penta (Meth) acrylate, trimethylol propane di (meth) acrylate, trimethylol ethane di (meth) acrylate, 2-hydroxy-3- Methanol mono (meth) acrylate and the like They may be used alone or in combination, but the present invention is not limited thereto.

The vinyl monomer having the carboxyl group (a-3) may be a (meth) acrylic acid ester having 1 to 10 carbon atoms or a carboxylic acid having a vinyl group at one end or in the structure and having at least one carboxyl group. For example, (meth) acrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, or maleic anhydride may be used singly or in combination as the vinyl monomer having a carboxyl group, but the present invention is not limited thereto.

The vinyl-based monomer having an aromatic ring as the (a-4) may be a (meth) acrylate having an aromatic ring. (Meth) acrylate, phenoxy (meth) acrylate, 2-ethylphenoxy (meth) acrylate, benzyl (meth) acrylate and the like can be used as the vinyl monomer having the aromatic ring (a- Acrylate, 2-phenylethyl (meth) acrylate, 3-phenylpropyl (meth) acrylate, 4-phenylbutyl (Meth) acrylate, 2- (4- (1-methylethyl) phenyl) ethyl (meth) acrylate, 2- Acrylate, 2- (4-methoxyphenyl) ethyl (meth) acrylate, 2- (4-cyclohexylphenyl) ethyl 2- (3-chlorophenyl) ethyl (meth) acrylate, 2- (4-chlorophenyl) ethyl - phenyl phenyl) Butyl (meth) acrylate, benzyl (meth) acrylate or 2- (4-benzylphenyl) ethyl (meth) but can be used alone or in combination with acrylate, and the like.

According to one embodiment, the (meth) acrylic polymer is at least one monomer selected from the group consisting of (a-1) a vinyl monomer having an alkyl group, (a-2) a vinyl monomer having a hydroxyl group, and May be a copolymer prepared by copolymerizing the monomer mixture. Specifically, the (meth) acryl-based polymer is prepared by copolymerizing 84 to 99.8% by weight, preferably 85 to 95% by weight, of the vinyl monomer having the alkyl group (a-1) (A-3) 0.1 to 6% by weight, preferably 1 to 4% by weight, of a vinyl monomer having a carboxyl group, based on 100% by weight of the copolymer Lt; / RTI >

(A-1) a vinyl monomer having (a-2) a hydroxyl group, (a-3) a vinyl monomer having a carboxyl group, and (a-4) a monomer mixture containing a vinyl monomer having an aromatic ring. Specifically, the (meth) acrylic polymer is a copolymer of 50 to 89.4% by weight, preferably 60 to 75% by weight, of the vinyl monomer having an alkyl group (a-1) (A-3) 0.1-3 wt%, preferably 0.1-3 wt% of a vinyl monomer having a carboxyl group, and (a-4) vinyl monomers having an aromatic ring And 10 to 42% by weight, preferably 15 to 35% by weight of the monomer.

The method for producing the (meth) acrylic copolymer is not particularly limited, and can be produced by a solution polymerization method, a photopolymerization method, a bulk polymerization method, an emulsion polymerization method, or an emulsion polymerization method. Preferably, the (meth) acrylic copolymer is produced by a solution polymerization method, and the polymerization temperature is preferably 50 ° C to 140 ° C. As the initiator that can be used at this time, an azo-based polymerization initiator such as azobisisobutyronitrile or azobiscyclohexanecarbonitrile; And / or peroxides such as benzoyl peroxide or acetyl peroxide, and the like.

(B) an isocyanate-based curing agent

The first pressure sensitive adhesive composition may include an isocyanate curing agent. As the isocyanate curing agent, those known in the art can be used, and examples thereof include toluene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, hydrogenated tolylene diisocyanate, Diisocyanate, 1,3-bis-diisocyanatomethylcyclohexane, tetramethylxylylene diisocyanate, 1, 3-xylylene diisocyanate, 1,4-xylene diisocyanate, diphenylmethane- 5-naphthalene diisocyanate, hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, trimethylolpropane-modified toluene diisocyanate, trimethylolpropane-modified tolylene di Isocyanates, trilene diisocyanate adducts of trimethylolpropane, trimethylol Xylene isocyanate radio air ducts, storage diphenylmethane diisocyanate storage of ropan, methylenebis triisocyanate, those of the polyol (trimethylol propane), and a mixture thereof and the like.

The isocyanate-based curing agent (B) may be contained in an amount of 0.01 to 20 parts by weight, preferably 0.5 to 5 parts by weight, based on 100 parts by weight of the (meth) acrylic polymer (A).

(C) Carbodiimide  Hardener

The first pressure sensitive adhesive composition may comprise (C) a carbodiimide curing agent. Since the carbodiimide curing agent (C) has a high crosslinking reaction rate, the curing time of the pressure-sensitive adhesive composition can be shortened when the isocyanate-based curing agent is used alone, Effect can be obtained.

The carbodiimide curing agent (C) used in the present invention is not particularly limited. For example, a compound having two or more carbodiimide groups (-N═C═N-) in the molecule as the (C) carbodiimide curing agent may be used, and known polycarbodiimides may be used.

The polycarbodiimide may be prepared by a decarboxylic acid condensation reaction of a diisocyanate in the presence of a carbodiimidization catalyst.

Examples of the diisocyanate include 4,4'-diphenylmethane dianisocyanate, 3,3'-dimethoxy-4,4'-diphenylmethane dianisocyanate, 3,3'- 3'-dimethyl-4,4'-diphenylmethane diisocyanate, 4,4'-diphenyl ether diisocyanate, 3,3'-dimethyl-4,4'-diphenyl Ether diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1-methoxyphenyl-2,4-diisocyanate, isophorone Diisocyanate, 4,4'-dicyclohexylmethane dianisocyanate, and tetramethyl xylylene diisocyanate, or a mixture of two or more thereof.

Examples of the carbodiimidization catalyst include 1-phenyl-2-phospholene-1-oxide, 3-methyl-2-phospholene-1-oxide, , 1-ethyl-2-phosphorene-1-oxide, or 3-phosphorene isomers thereof.

The carbodiimide curing agent (C) may be synthesized or a commercial product may be used. Commercially available products of the carbodiimide curing agent (C) include carbodite (registered trademark) series of Nisshinbo Chemical Co., Ltd., for example. Among them, Cabodite (registered trademark) V-03, V-09, V-09GB and the like are preferable because of their excellent compatibility with organic solvents.

The carbodiimide curing agent (C) may be used alone or in combination of two or more.

In the present invention, the (C) carbodiimide curing agent may be included in an amount of 0.01 to 5 parts by weight, preferably 0.05 to 1 part by weight, based on 100 parts by weight of the (meth) acrylic polymer.

 (D) Silane Coupling agent

The first pressure sensitive adhesive composition may comprise (D) a silane coupling agent. (D) The silane coupling agent improves the heat resistance and moisture resistance of the pressure-sensitive adhesive composition and improves the adhesion reliability under high temperature and / or high humidity conditions.

The silane coupling agent (D) is not particularly limited, and silane coupling agents generally used in the art can be used without limitation. Examples of the silane coupling agent (D) include a polymerizable fluorinated group-containing silicon compound such as vinyltrimethoxysilane, vinyltriethoxysilane and (meth) acryloxypropyltrimethoxysilane; An epoxy structure such as gamma-epoxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, and 2- (3,4-epoxycyclohexyl) ; Containing silicon compounds such as 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane. ; And 3-chloropropyltrimethoxysilane may be used alone or in combination. The silane coupling agent (D) may be synthesized or a commercially available product may be used. Examples of commercially available silane coupling agents include Shinetsu Silicone (registered trademark) KBM-303, KBM-403, KBE-402, KBM-403, X-41-1805, X-41-1805, X-41-1810, X-41-1053, X-41-1058 (all of which are manufactured by Shin-Etsu Chemical Co., And the like.

The silane coupling agent (D) may be added in an amount of 0.01 to 5 parts by weight, preferably 0.05 to 1 part by weight, based on 100 parts by weight of the (A) (meth) acrylic polymer.

(E) Tackifier

The first pressure sensitive adhesive composition may comprise (E) a tackifier. The (E) tackifier may be an acrylic-modified petroleum resin tackifier having a structure of the following formula (1), for example, to improve the adhesive strength of the first pressure-sensitive adhesive composition.

≪ Formula 1 >

R'-CO-O-R

In the above formula (1), R 'is a petroleum resin, and R is an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 50 carbon atoms. Specifically, the R 'may be a styrene type, an α-styrene type, a terpene type, an aromatic modified terpene type, a hydrogenated terpene type, a xylene type, an aliphatic type or a rosin resin as the petroleum liquid resin, May be a styrene-based,? -Styrene-based, or aromatic-modified terpene-based resin.

Preferably, the (E) tackifier may include a compound represented by the following formula (2).

(2)

Wherein R is an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 50 carbon atoms, R ₁ to R ₂₃ are hydrogen or an alkyl group having 1 to 5 carbon atoms, n is an integer of 0 to 5, m is an integer of 0 to 10;

On the other hand, the acryl-modified petroleum resin tackifier can be produced by a conventional synthesis method. As an example, Diels-Alder reaction may be performed between Monomer A for producing a petroleum resin and Monomer B having an acrylic functional group, followed by hydrogenation. The monomer A may be a monomer having no acrylic functional group, for example, a diene monomer having 5 to 10 carbon atoms, such as 1,3-cyclopentadiene, isoprene, piperylene, and the like. The monomer B may be a (meth) acrylic acid ester having an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 50 carbon atoms. For example, when n is 0 in formula (2), an intermediate of formula (4) can be prepared by Diels-Alder reaction, and the resin of formula (2) can be prepared by hydrogenation.

≪ Formula 4 >

In the formula 4, R is an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 50 carbon atoms, and R ₁ to R ₁₀ , R ₁₃ to R ₂₃ are hydrogen or an alkyl group having 1 to 5 carbon atoms, and m is an integer of 0 to 10.

Alternatively, the acrylic modified petroleum resin tackifier may be a commercially available product (e.g., PX-95, Kolon Industries).

The (E) tackifier may be added in an amount of 1 to 10 parts by weight, preferably 1 to 7 parts by weight, based on 100 parts by weight of the (meth) acrylic polymer.

(F) Additive

The first pressure sensitive adhesive composition may further contain additives such as a curing accelerator, a lithium salt, an inorganic filler, a softening agent, an antioxidant, an antioxidant, a stabilizer, a tackifier resin, (Coloring pigments, extender pigments, etc.), treating agents (polyol resins, phenolic resins, acrylic resins, polyester resins, polyolefin resins, epoxy resins, epoxidized polybutadiene resins and the like), leveling agents, defoaming agents, , Ultraviolet light blocking agents, fluorescent whitening agents, dispersants, heat stabilizers, light stabilizers, ultraviolet absorbers, lubricants and solvents.

Among them, examples of the curing accelerator include dibutyltin dilaurate, JCS-50 (manufactured by Joho Kakaku Corp.), Fomate (registered trademark) TK-1 (manufactured by Mitsui Kagaku Co., Ltd.) .

Examples of the antioxidant include dibutyl hydroxytoluene (BHT), Irganox (registered trademark) 1010, Irganox (registered trademark) 1035FF, Irganox (registered trademark) 565 (all manufactured by BASF Japan Co., ) And the like.

When the additive is used, the amount of the additive to be used is not particularly limited, but may be, for example, 0.1 to 20 parts by weight based on 100 parts by weight of the component (A).

The pressure-sensitive adhesive composition of the present invention comprising the above-mentioned components may be prepared by mixing the respective components described above at a time, or sequentially mixing the components, or mixing any of a plurality of components, then mixing the remaining components, By weight. More specifically, the reaction can be carried out by stirring at room temperature or, if necessary, heating (for example, at a temperature of 30 to 40 캜) until uniformity in a stirrer or the like is maintained, for example, for 5 minutes to 5 hours.

The first pressure-sensitive adhesive composition as described above has high storage modulus and adhesion at high temperatures by using two kinds of curing agents together with the tackifier. Therefore, when the first pressure-sensitive adhesive layer is formed between the polarizer and the reflective polarizing member using the first pressure-sensitive adhesive composition, it is possible to effectively prevent the moisture of the polarizer from entering and exiting the polarizer and to firmly attach the polarizing element and the reflective polarizing member .

The second pressure-

Next, the second pressure sensitive adhesive layer 17 is provided on the protective film 13 for attaching the polarizing plate 10 to the display panel.

The second pressure-sensitive adhesive layer 17 has a storage modulus (G ' ₂ , _{85 ° C} ) measured at 85 ° C and 10 ^-3 to 10 ² rad / s at a frequency of 50,000 Pa to 300,000 Pa, Pa to 200,000 Pa, more preferably 60,000 Pa to 100,000 Pa. When the storage modulus (G ' ₂ , _{85 캜} ) of the second pressure sensitive adhesive layer 17 at 85 캜 satisfies the above range, panel bending can be effectively prevented from occurring when the polarizing plate is attached to the panel. At this time, the storage modulus G ' ₂ , _{85 ° C} was measured in the same manner as described for the first pressure sensitive adhesive layer.

The second pressure-sensitive adhesive layer 17 has a peel strength of not more than 500 gf / inch, preferably 100 to 500 gf / inch, more preferably 200 to 400 gf / inch measured through a 180 ° peel test . When the peeling strength of the second pressure-sensitive adhesive layer satisfies the above range, it has good releasability.

The peeling strength of the second pressure-sensitive adhesive layer was obtained by cutting a polarizing film laminated in the order of a reflective polarizing member / first pressure-sensitive adhesive layer / polarizer / protective film / second pressure-sensitive adhesive layer to a size of 25 mm x 150 mm, Layer was placed on a panel glass substrate, and the glass plate was attached to the panel glass substrate by reciprocating once with a 2 kg roller. After 60 minutes elapsed under the conditions of 22 ± 2 ° C. and 65 ± 5% RH, the second pressure- , And the second pressure-sensitive adhesive layer was peeled off at a rate of 300 mm / min. The thickness of the second pressure-sensitive adhesive layer was 1 to 30 탆, 10 to 30 탆 Lt; / RTI > When the thickness of the second pressure sensitive adhesive layer satisfies the above range, the adhesive force with the panel can be sufficiently secured.

On the other hand, the second pressure sensitive adhesive layer may be formed by curing a second pressure sensitive adhesive composition including, for example, (A ') a (meth) acrylic polymer and (B') a curing agent.

According to one embodiment, the second pressure sensitive adhesive composition may comprise 100 parts by weight of the (A ') (meth) acrylic polymer and 0.5 to 20 parts by weight of the curing agent (B').

The (A ') (meth) acrylic polymer is formed by polymerizing at least one (meth) acrylic monomer, and the (meth) acrylic polymer or copolymer for a pressure sensitive adhesive well known in the art can be used without limitation . For example, the (A) (meth) acrylic polymer described in the first pressure-sensitive adhesive composition described above may be used.

As the (B ') curing agent, conventional curing agents known in the art may be used without limitation. For example, the isocyanate curing agent and / or carbodiimide curing agent described in the first pressure sensitive adhesive composition may be used have.

The second pressure-sensitive adhesive composition may further contain, in addition to the components (A ') and (B'), a curing accelerator, a lithium salt, an inorganic filler, a softener, an antioxidant, an antioxidant, a stabilizer, Plasticizers, dyes, pigments (coloring pigments, extender pigments, etc.), ultraviolet rays (ultraviolet rays), ultraviolet rays (F) such as a blocking agent, a fluorescent whitening agent, a dispersing agent, a heat stabilizer, a light stabilizer, an ultraviolet absorber, a lubricant and a solvent.

When the additive is used, the amount of the additive to be used is not particularly limited, but may be, for example, 0.1 to 20 parts by weight based on 100 parts by weight of the component (A ').

The second pressure-sensitive adhesive composition containing the above-mentioned components may be prepared by blending each of the components described above at a time, sequentially mixing the components, or after mixing any of a plurality of components and then mixing the remaining components, Followed by stirring. More specifically, the reaction can be carried out by stirring at room temperature or, if necessary, heating (for example, at a temperature of 30 to 40 캜) until uniformity in a stirrer or the like is maintained, for example, for 5 minutes to 5 hours.

The reflection type polarization member

The reflection type polarization member 19 is an optical member that transmits only linearly polarized light in a specific vibration direction and reflects other polarized light, and is provided on the first pressure-sensitive adhesive layer 15. [ At this time, the transmission axis of the reflection type polarization member 19 is disposed in parallel with the transmission axis of the polarizer 11.

When the polarizing plate integrally including the reflective polarizing member 19 as the polarizing plate of the present invention is used as a polarizing plate disposed on the backlight side of the display apparatus, the effect of improving the brightness of the display apparatus can be obtained. Specifically, when the light emitted from the backlight unit reaches the reflection type polarization member 19, only the polarized light vibrating in the transmission axis direction of the polarizer 11 is transmitted, and the remaining lights are recycled in the backlight direction. As a result, only the light oscillating on the transmission axis of the polarizer 11 reaches the polarizer, so that the amount of light absorbed by the polarizer 11 is minimized and the efficiency of light utilization is increased. As a result, the luminance improvement effect of the display device can be obtained .

As the reflective polarizing member 19, optical members that transmit linearly polarized light in a specific vibration direction and reflect other polarized light, for example, an anisotropic multi-layered film, an anisotropic reflective polarizer, or a reflective grid polarizer, And is not particularly limited. Examples of the anisotropic multi-layer film include DBEF and APF manufactured by 3M. Examples of the anisotropic reflective polarizer include a cholesteric liquid crystal layer such as a PCF manufactured by Nitto Denko Corporation and a complex of? / 4 plate or a reflective grid polarizer. Reflective grid polarizers include metal lattice reflective polarizers (see, for example, US Pat. No. 6,288,840) such as those in which fine processing is performed on a metal to give reflective polarized light even in a visible region, and those obtained by stretching metal fine particles into a polymer matrix (See, for example, Japanese Unexamined Patent Publication No. 8-184701).

Conventionally, when the reflective polarizing member as described above is integrally formed on a single-polarizing polarizing plate, there is a problem that edge reflex phenomenon occurs in which the reflective polarizing member at the edge portion of the polarizing plate peels off in a high temperature and / there was. However, in the case of the polarizing plate according to the present invention, a high adhesive force is maintained even at a high temperature, so that such an edge lifting phenomenon does not occur. Specifically, the polarizing plate of the present invention is allowed to stand under the conditions of 85 ° C and 80% relative humidity for 500 hours, and then left for one hour at room temperature. Thereafter, the interval Δd between the reflective polarizing member and the polarizer measured 3 mm or less, preferably 1 mm or less.

Next, a display device of the present invention will be described.

The display device of the present invention includes the above-described polarizing plate according to the present invention. More specifically, the display device of the present invention may include a liquid crystal panel 100, a first polarizer 200, a second polarizer 300, and a backlight unit 400, as shown in FIG. 2 . At this time, the polarizing plate according to the present invention can be used as the second polarizing plate 300 disposed on the backlight unit 400 side. When the polarizing plate according to the present invention is used for the second polarizing plate 300, as described above, the light utilization efficiency is improved by the reflective polarizing member, and the brightness of the display device can be further improved.

The liquid crystal panel 100 includes an upper substrate 110, a lower substrate 130, and a liquid crystal cell 120 interposed between the upper substrate 110 and the lower substrate 130. In the present invention, the upper substrate 110 refers to a substrate disposed on the observer side of the liquid crystal panel, and the lower substrate 130 refers to a substrate disposed on the backlight unit side.

The material and configuration of the upper substrate 110, the lower substrate 130, and the liquid crystal cell 120 are not particularly limited in the present invention, and various upper substrates and lower substrates used for liquid crystal panel structures in the related art Substrates and liquid crystal cells can be used without limitation. In addition, the driving mode of the liquid crystal panel is not particularly limited, and liquid crystal panels of various modes used in the related art such as TN (Twist-Nematic) mode, VA (Vertical Alignment) -Plane Swiching) mode liquid crystal panels can be used without limitation.

The first polarizing plate 200 is a polarizing plate disposed on the upper substrate 110 of the liquid crystal panel, that is, on the observer side. The second polarizing plate 300 is disposed below the lower substrate 130 of the liquid crystal panel, That is, a polarizing plate disposed on the backlight unit 400 side.

As the first polarizing plate 200, polarizing plates used in the related art can be used without limitation and are not particularly limited. For example, as the first polarizing plate 200, a single-sided polarizing plate having a protective film disposed on both sides of the polarizer or a single-sided polarizing plate having a protective film disposed on one surface of the polarizing plate and a pressure- have. The details of the polarizer and the protective film included in the first polarizer 200 are the same as those of the polarizer and the protective film described above, and a detailed description thereof will be omitted. The first polarizing plate 200 may further include an optical layer such as a retardation film, an anti-reflection layer, an anti-sticking layer, a diffusion layer, and an anti-glare layer for optical compensation as needed.

As the second polarizer 300, the polarizer according to the present invention can be used. At this time, the second polarizer 300 is disposed such that the second pressure sensitive adhesive layer is on the liquid crystal panel side. Since details of the polarizer according to the present invention have been described above, a detailed description thereof will be omitted.

Next, the backlight unit 400 supplies light to the liquid crystal panel 100, and the backlight unit 400 used in the related art can be used without limitation. For example, the backlight unit includes a light source unit including at least one light source and a printed circuit board on which the light source is mounted, and optical films (for example, a light guide plate, a condenser Film, diffusion film, diffusion plate, etc.).

Next, the present invention will be described in more detail with reference to concrete examples.

The specifications of the components used in the following examples and comparative examples are as follows.

(A) a (meth) acrylic polymer

(A1) A (meth) acrylic copolymer having a Mw of 1.6 million g / mol and a Tg of -40 ° C was used.

(A2) A (meth) acrylic copolymer having a Mw of 1.5 million g / mol and a Tg of -33 ° C was used.

(B) Isocyanate-based curing agent: Trimethylol propane adduct cocoronate L of diisocyanate manufactured by Nippon Polyurethane Industry was used.

(C) Carbodide-based curing agent: V05S of Nisshinbo Chemical Co. was used.

(D) Silane coupling agent: KBM-403 (3-glycidoxypropylmethoxysilane) manufactured by Shin-Etsu Chemical Co., Ltd. was used.

(E) Tackifier: CK-500L manufactured by NCI Corporation was used.

Preparation Example: Preparation of pressure-sensitive adhesive composition

The components (A) to (C) were mixed in the amounts shown in Table 1 in 20 parts by weight of methyl ethyl ketone and stirred at 25 캜 for 5 minutes. Then, a silane coupling agent (D) and a tackifier ) Was added in the amounts shown in Table 1 below, and the mixture was stirred at 25 占 폚 for 5 minutes to prepare pressure-sensitive adhesive compositions I to XI.

The storage elastic modulus (G _{'85 deg} . _C ) at _{85 deg} . C of the pressure-sensitive adhesive composition thus prepared was measured by the following physical property measurement method. The measurement results are shown in [Table 1].

division (A) (parts by weight) (B)
(Parts by weight) (C)
(Parts by weight) (D)
(Parts by weight) (E)
(Parts by weight) G _{'85 ° C}
(Pa) (A1) (A2) I 100 - 0.5 0.05 0.1 3 11 million II 100 - One 0.1 0.08 5 12 million III 100 - 3 0.1 0.1 One 15 million IV 100 - 10 0.2 0.06 5 300,000 V 100 - 12 0.05 0.05 10 35 million VI 100 - 2 0.1 0.30 7 13 million VII 100 - 5 0.15 0.50 3 20 million VIII 100 - 25 0.02 1.05 - 60 million IX 100 - 0.3 0.02 0.02 - 6 million X 100 0.1 6 million XI 100 0.3 10 million

Examples and Comparative Examples

A polarizing plate was prepared by laminating a protective film on a polyvinyl alcohol polarizer using an aqueous adhesive. Then, a first pressure-sensitive adhesive layer was formed on the surface of the polyvinyl alcohol polarizer on which the protective film was not laminated, a reflective polarizing member APF FILM (manufactured by 3M) was laminated, and a second pressure- To prepare a polarizing plate. The first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer were formed using the pressure-sensitive adhesive composition shown in Table 2 below. The thickness of the first pressure-sensitive adhesive layer after curing was 10 탆, and the thickness after curing of the second pressure- 20 mu m.

The peel strength, polarizer crack, buckling degree and panel warpage of the first and second pressure-sensitive adhesive layers of the polarizing plates manufactured as described above were measured by the following methods. The measurement results are shown in Table 2.

How to measure property

(1) Storage modulus

The pressure-sensitive adhesive composition was applied to a polyethylene terephthalate film as a release film and dried at 90 占 폚 for 4 minutes to form a pressure-sensitive adhesive layer having a thickness of 20 占 퐉. Then, the pressure-sensitive adhesive layer was cured by keeping the pressure-sensitive adhesive layer at 35 DEG C and 45% relative humidity for 3 days, and then a plurality of cured pressure-sensitive adhesive layers were laminated to produce a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer having a thickness of 1 mm. Then, the pressure-sensitive adhesive sheet was cut into a circle having a diameter of 8 mm to prepare a specimen. The specimen was then measured at a temperature of 85 ° C and a frequency of 10 ^-3 to 10 ² rad / s using a storage elasticity meter (MCR-501, Physica) The frequency sweep test was performed to measure the storage elastic modulus. The minimum value of the measured storage modulus was defined as the storage modulus value.

(2) Peel strength

The polarizing plate laminated in the order of the reflective polarizing member / first pressure-sensitive adhesive layer / polarizer / protective film / second pressure-sensitive adhesive layer prepared in Examples and Comparative Examples was cut into a size of 210 mm x 25 mm, and the second pressure- And fixed on a glass substrate having a size of 130 mm. Then, the measurement was performed in a Texture Analyzer Peel test mode. The reflective polarizing member was tightly fixed to the TA jig, and then the reflective polarizing member was pulled at a peeling angle of 180 ° and a speed of 300 mm / min to bond the first adhesive layer and the polarizer The peel strength of the first pressure-sensitive adhesive layer was measured.

The peeling strength of the second pressure-sensitive adhesive layer was measured in the same manner as in Example 1 except that the polarizing film laminated in the order of the reflective polarizing member / first pressure-sensitive adhesive layer / polarizer / protective film / second pressure- After the second pressure-sensitive adhesive layer was placed on the panel glass substrate, the pressure-sensitive adhesive sheet was once attached to the pressure-sensitive adhesive sheet by means of a 2 kg roller. The pressure-sensitive adhesive sheet was then subjected to 60 ± 2% RH at 22 ± 2 ° C. and 65 ± 5% After fixing the second pressure-sensitive adhesive layer on the jig, the second pressure-sensitive adhesive layer was peeled off at a rate of 180 DEG and 300 mm / min.

(3) Polarizer crack

The polarizing plate prepared in Examples and Comparative Examples was cut to a size of 100 mm x 175 mm, and the second adhesive layer was laminated on a glass substrate. The specimens were allowed to stand at 85 ℃ and 80% relative humidity for 500 hours and then allowed to stand at room temperature for 1 hour.

The specimens were allowed to stand at room temperature for 1 hour after leaving the specimens at 85 ° C and 80% RH for 500 hours, and the heat resistance was confirmed by the number of cracks. The number of cracks was confirmed with a microscope.

(4) Lift the edge

The polarizing plates prepared according to Examples and Comparative Examples were allowed to stand for 500 hours at 85 ° C and 85% RH, left at room temperature for 1 hour, and then the interval between the polarizer and the reflective polarizing member was measured through a microscope Observed and expressed in numerical value.

(5) panel bending

The polarizing plates prepared according to Examples and Comparative Examples were laminated on a glass substrate and adhered to the flat upper surface of the table. The distance (height) h0 from the upper surface of the table to the edge of the glass substrate to which the polarizing plate was attached was measured, After the glass substrate with the polarizer attached thereto was allowed to stand at 85 캜 for 48 hours, the distance (height) h1 from the upper surface of the table to the edge portion of the glass substrate was measured in the same manner. Then, the value obtained by subtracting h0 from h1 was evaluated as panel bending.

As shown in Table 2, the polarizing plates of Examples 1 to 7, in which the difference (ΔG'85 ° C.) between the storage modulus of the first pressure-sensitive adhesive layer and the storage modulus of the second pressure-sensitive adhesive layer was 5-40,000 Pa, And the occurrence of warpage is small after attaching to the glass substrate. On the other hand, in the polarizing plates of Comparative Examples 1 and 2 in which the difference in storage modulus (ΔG'85 ° C.) between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer was out of the range of the present invention, polarizer cracks occurred under high temperature and high humidity conditions, And / or warpage after adhesion of the glass substrate.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and variations are possible in light of the above teachings.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

10: polarizer
11: Polarizer
13: Protective film
15: first pressure-sensitive adhesive layer
17: second pressure-sensitive adhesive layer
19: reflection type polarization member
100: liquid crystal panel
200: first polarizer plate
300: second polarization plate
400: Backlight unit

Claims (11)

A polarizer;
A protective film provided on one surface of the polarizer;
A first pressure-sensitive adhesive layer provided on the other surface of the polarizer;
A second pressure-sensitive adhesive layer provided on the protective film; And
And a reflective polarizing member provided on the first pressure-sensitive adhesive layer,
(? G _{'85 ° C} ) between the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer at 85 ° C. represented by the following formula (1) is from 50,000 Pa to 400,000 Pa,
(1):? G _{'85 ° C} = G' ₁ , _{85 ° C} - G ' ₂ , _{85 ° C}
The formula (1) in G _{'1, 85 ℃} is 85 ℃, 10 ^-3 ~ 10 ^2, and the storage modulus value of the first pressure-sensitive adhesive layer as measured at a frequency in rad / s, the G' _{2, 85 ℃} is 85 ℃, 10 ^-3 ~ 10 ² storage modulus ¹ of the second pressure-sensitive adhesive layer as measured at a frequency in rad / s,
Wherein the first pressure-sensitive adhesive layer has a peel strength of 1000 gf / inch or more as measured through a 180 ° peel test. The method according to claim 1,
Wherein the first pressure-sensitive adhesive layer has a storage modulus (G ' ₁ , _{85 ° C} ) of 100,000 Pa to 500,000 Pa measured at _{85 ° C} at a frequency of 10 ^-3 to 10 ² rad / s. delete The method according to claim 1,
Wherein the first pressure-sensitive adhesive layer is formed by a first pressure-sensitive adhesive composition comprising a (meth) acrylic polymer, an isocyanate curing agent, a carbodiimide curing agent, a silane coupling agent, and a tackifier. 5. The method of claim 4,
Wherein the first pressure sensitive adhesive composition comprises 100 parts by weight of a (meth) acrylic polymer, 0.01 to 20 parts by weight of an isocyanate curing agent, 0.01 to 5 parts by weight of a carbodiimide curing agent, 0.05 to 5 parts by weight of a silane coupling agent, To 10 parts by weight of a polarizing plate. The method according to claim 1,
Wherein the second pressure-sensitive adhesive layer has a storage modulus (G ' ₂ , _{85 ° C} ) of 50,000 Pa to 300,000 Pa measured at _{85 ° C} at a frequency of 10 ^-3 to 10 ² rad / s. The method according to claim 1,
Wherein the second pressure-sensitive adhesive layer has a peel strength of 500 gf / inch or less as measured through a 180 ° peel test. The method according to claim 1,
Wherein the second pressure sensitive adhesive layer is formed by a second pressure sensitive adhesive composition comprising a (meth) acrylic polymer and a curing agent. The method according to claim 1,
Wherein the polarizing plate is allowed to stand under conditions of 85 캜 and 80% relative humidity for 500 hours and then allowed to stand at room temperature for 1 hour, wherein the interval (? D) between the reflective polarizing member and the polarizer is 3 mm or less. A display device comprising the polarizing plate of any one of claims 1, 2, and 4 to 9. A liquid crystal panel including an upper substrate, a lower substrate, and a liquid crystal cell disposed between the upper substrate and the lower substrate;
A first polarizer disposed on an upper surface of the upper substrate;
A second polarizer disposed on a lower surface of the lower substrate; And
And a backlight unit disposed below the lower substrate,
Wherein the second polarizing plate is the polarizing plate of any one of claims 1, 2, and 4 to 9.

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