KR20160053107A - Adhesive film comprising silicone resin for the polarizing plate, adhesive composition comprising silicone resin for the same, polarizing plate comprising the same and optical display comprising the same - Google Patents

Abstract

A pressure sensitive adhesive composition for a polarizing plate for the polarizing plate, a polarizing plate comprising the same, and an optical display device comprising the same are provided.

Description

TECHNICAL FIELD [0001] The present invention relates to a pressure-sensitive adhesive composition for a polarizing plate, a silicone-based pressure-sensitive adhesive composition for a polarizing plate, a polarizing plate containing the same, and an optical display device comprising the pressure- AND OPTICAL DISPLAY COMPRISING THE SAME}

The present invention relates to a silicone-based adhesive film for a polarizing plate, a silicone-based pressure-sensitive adhesive composition for a polarizing plate for the same, a polarizing plate including the same, and an optical display device containing the same.

The liquid crystal display includes a liquid crystal panel and a polarizer attached to both sides of the liquid crystal panel, and the polarizer includes a polarizer and a protective film formed on at least one surface of the polarizer to protect the polarizer. The polarizing plate is attached to the liquid crystal panel by an adhesive film for a polarizing plate. Triacetyl cellulose (TAC) film is mainly used as a protective film. In particular, a saponified TAC film is used to increase adhesion to a polarizer and an adhesive layer. An acrylic adhesive film is mainly used as an adhesive film for a polarizing plate. Since the acrylic adhesive film has a high adherence to a TAC film of 2000 gf / inch or more after aging, there is no peeling between the TAC film and the adhesive film and no separation of the adhesive film However, the TAC film may be modified to lower the heat resistance of the polarizing plate, to yellow the TAC film, and to separate the TAC film at high temperature and / or high humidity.

Accordingly, a silicone adhesive film containing a silicone polymer may be considered as the adhesive film for a polarizing plate. The silicone-based adhesive film can increase durability such as heat resistance of the polarizing plate without yellowing the TAC film. However, the conventional silicone-based adhesive film has low surface energy and low wettability, and has low adhesion to a substrate with respect to a TAC film.

The background art of the present invention is disclosed in Japanese Laid-Open Patent Application No. 2012-041505.

An object of the present invention is to provide a silicone-based pressure-sensitive adhesive film for a polarizing plate having high substrate adhesion to a substrate layer having a hydroxyl group.

Another object of the present invention is to provide a silicone-based pressure-sensitive adhesive film for a polarizing plate, which can prevent separation of a protective film from a polarizing plate including a substrate layer having a hydroxyl group and elimination of sticking film upon cutting.

Another object of the present invention is to provide a silicone-based pressure-sensitive adhesive film for a polarizing plate capable of enhancing durability and reliability at high temperature and / or high humidity in a polarizing plate including a substrate layer having a hydroxyl group.

It is still another object of the present invention to provide a silicone adhesive film for a polarizing plate which is free from yellowing of the film even at high temperature and / or high humidity in a polarizing plate comprising a cellulose ester film.

The silicone-based pressure-sensitive adhesive film for a polarizing plate of the present invention may have a substrate adhesion of 1000 gf / inch or more to a base layer having a hydroxyl group.

The pressure-sensitive adhesive composition for a polarizing plate of the present invention comprises an isocyanate group-containing silicone polymer; And an isocyanate group-containing silicone curing agent; ≪ / RTI >

The polarizing plate of the present invention may include the silicone-based adhesive film for the polarizing plate or the adhesive film formed of the silicone-based adhesive composition for the polarizing plate.

The optical display device of the present invention may include the polarizing plate.

The present invention provides a silicone-based pressure-sensitive adhesive film for a polarizing plate having high substrate adhesion to a substrate layer having a hydroxyl group. The present invention provides a silicone-based pressure-sensitive adhesive film for a polarizing plate capable of preventing separation of a protective film from a polarizing plate including a substrate layer having a hydroxyl group and eliminating the sticking film from being cut off. The present invention provides a silicone-based pressure-sensitive adhesive film for a polarizing plate capable of enhancing durability and reliability at high temperature and / or high humidity in a polarizing plate comprising a substrate layer having a hydroxyl group. The present invention provides a silicone-based pressure-sensitive adhesive film for a polarizing plate which prevents a film yellowing even at high temperature and / or high humidity in a polarizing plate comprising a cellulose ester-based film.

1 is a sectional view of a polarizing plate of an embodiment of the present invention.
2 is a cross-sectional view of an optical display device according to an embodiment of the present invention.

The present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In the present specification, the terms "upper" and "lower" are based on the drawings and are not necessarily fixed to the upper and lower portions. .

In the present specification, the "curable functional group" is a functional group that reacts with a curing agent to cause a curing reaction, and may be an unsaturated hydrocarbon group having 2 to 12 carbon atoms having an unsaturated bond at the terminal, such as a vinyl group or an allyl group, Quot; does not include an isocyanate group.

Herein, the "substrate layer" is not limited as long as it forms a layered structure, and means, for example, a protective film, a protective coating layer, or a polarizer layer.

In the present specification, the term "contact angle" refers to a contact angle measured by dropping pure water of 1 drop using a syringe needle on a film using an automatic contact angle meter DM700 (Kyowa Interface Science Co., Ltd.).

In the present specification, the term " substrate adhesion strength "is defined as a value obtained by coating the pressure-sensitive adhesive composition of Example and Comparative Example to a thickness of 20 μm on a polyethylene terephthalate (PET) film (A4300), drying at 90 ° C for 4 minutes (min) The sample was prepared by laminating a TAC film (Konika, contact angle: 25 °) and an adhesive layer, and left at 35 ° C for 72 hours. Using a TA.XT.plus (TA instrument) Quot; means the force which is exfoliated when the interface between the TAC film and the pressure-sensitive adhesive is peeled off.

Hereinafter, the silicone-based adhesive film for a polarizing plate of one embodiment of the present invention will be described.

The silicone-based adhesive film for a polarizing plate of the embodiment of the present invention may have a substrate adhesion of 1000 gf / inch or more to a substrate layer having a hydroxyl group. The above-mentioned "silicone-based adhesive film" means an adhesive film comprising a silicone resin such as a silicone polymer and / or a silicone adhesive resin.

The silicone-based pressure-sensitive adhesive film for a polarizing plate of the present invention in one embodiment of the present invention is a pressure-sensitive adhesive film which is adhered to a substrate layer having a hydroxyl group and which is obtained by adhering a polarizing plate comprising a base layer having a hydroxyl group to a liquid crystal panel, And the durability of the polarizing plate can be increased at high temperature and / or high humidity by including a silicone resin. In particular, when the substrate layer having a hydroxyl group is a cellulose ester-based film, the occurrence of yellowing at high temperature and / or high humidity may be suppressed. At the same time, the silicone adhesive film for a polarizing plate containing a conventional silicone resin had a substrate adhesion strength of less than 1000 gf / inch to a substrate layer having a hydroxyl group, whereas the substrate adhesion to a substrate layer having a hydroxyl group was high, It is possible to prevent the base layer having a hydroxyl group from being separated from the adhesive film under high humidity conditions and there is no detachment of the adhesive film during lifting or cutting between the adhesive film and the base layer having a hydroxyl group. Specifically, the adhesion of the base material may be 1000 gf / inch or more, for example, 1000 to 2000 gf / inch, preferably 1200 to 2000 gf / inch, and may be usable for the polarizer in the above range.

The silicone-based pressure-sensitive adhesive film for a polarizing plate of the present invention contains an isocyanate group (-NCO), thereby ensuring a substrate adherence of 1000 gf / inch or more, for example, 1000 to 2000 gf / inch, preferably 1200 to 2000 gf / inch . That is, the chemical bonding (urethane bond) between the isocyanate group of the pressure-sensitive adhesive film and the base period of the base layer having a hydroxyl group can increase the adhesion of the base.

The substrate layer having a hydroxyl group is not limited as long as it has a hydroxyl group on the surface and is an optically transparent substrate layer, and examples thereof include a protective film having a hydroxyl group, a protective coating layer having a hydroxyl group, or a polarizer having a hydroxyl group, no.

In the embodiment, the substrate layer having a hydroxyl group may be a protective film having a hydroxyl group, and specifically a cellulose ester-based film. For example, it may be a cellulose ester-based film in which hydroxyl groups are exposed on the surface of a film by triacetyl cellulose, diacetyl cellulose or the like with a saponification treatment, and the contact angle of the film may be 20 ° to 30 °. The "contact angle" can be measured by a conventional method known to those skilled in the art. For example, by using a fully automatic contact meter DM700 (manufactured by Kyowa Interface Science Co., Ltd.), 1 drop of pure water And the contact angle was measured.

In another embodiment, the substrate layer having a hydroxyl group may be a protective coating layer having a hydroxyl group, and specifically, may be a protective coating layer cured after coating with a composition containing (meth) acrylate having a hydroxyl group, no.

In another embodiment, the substrate layer having a hydroxyl group may be a polarizer layer having a hydroxyl group. The polarizer layer having a hydroxyl group polarizes natural or artificial light to display a screen on a display device, and can be mainly made of a polyvinyl alcohol-based film. For example, the polarizer can be produced by dyeing a modified polyvinyl alcohol film such as a partially-formalized polyvinyl alcohol film or an acetoacetyl-modified polyvinyl alcohol film with iodine or a dichroic dye and then stretching it with an MD. Specifically, it can be produced by a swelling process, a dyeing process, and a stretching process. As another method, an acid catalyst-impregnated film is prepared by using a coating solution containing an acid catalyst and polyvinyl alcohol (PVA), and the dry drawing and dehydration treatment of the acid-impregnated impregnated film are separately performed to prepare a dehydrated film, And then wet stretching and neutralizing the film.

The thickness of the silicone-based adhesive film for a polarizing plate may be 5 占 퐉 to 100 占 퐉, and within this range, it may be used as an adhesive film for a polarizing plate.

The silicone-based adhesive film for a polarizing plate can be produced by coating the pressure-sensitive adhesive composition for a polarizing plate of the present invention with a predetermined thickness on a base film or the like and aging the same. Specifically, aging of the pressure-sensitive adhesive composition may include, but is not limited to, an incubation period of 1 hour to 1 week at a constant temperature of 20 ° C to 50 ° C and a relative humidity of 30% to 60% of constant humidity.

Hereinafter, the silicone-based pressure-sensitive adhesive composition for a polarizing plate of the present invention will be described.

The silicone-based pressure-sensitive adhesive composition for a polarizing plate of the present invention may include at least one of an isocyanate group-containing silicone polymer and an isocyanate group-containing silicone curing agent. As a result, the silicone-based pressure-sensitive adhesive composition for a polarizing plate of the present invention can realize both the effects due to the silicon and isocyanate groups described above.

Hereinafter, the silicone-based pressure-sensitive adhesive composition for a polarizing plate of one embodiment of the present invention will be described.

The silicone-based pressure-sensitive adhesive composition for a polarizing plate of one embodiment of the present invention may include an isocyanate group-containing silicone polymer, a silicone curing agent, and a silicone pressure-sensitive adhesive resin.

The isocyanate group-containing silicone polymer has no adhesive force, but forms a matrix of the adhesive film and has an isocyanate group, so that the adhesion of the substrate to the adhesive layer and the base layer having a hydroxyl group can be enhanced.

The isocyanate group-containing silicone polymer is a linear silicone-based polymer, which may be a siloxane oligomer or polymer having an isocyanate group and a curable functional group. Specifically, the isocyanate group-containing silicone polymer is a copolymer of a silicone-based monomer mixture, and may contain 0.1 to 10 mol% of a monomer having an isocyanate group in 100 mol% of the silicon-based monomer mixture.

 For example, a copolymer formed by the reaction of a non-isocyanate-based first monomer having a curable functional group, at least one non-isocyanate-based second monomer having no curable functional group, and a third monomer having an isocyanate group. The third monomer is selected from the group consisting of isocyanatopropylmethyldimethoxysilane, isocyanatopropylmethyldiethoxysilane, (isocyanatopropyl) heptamethyltrisiloxane, isocyanatopropyldimethylchlorosilane, isocyanatopropyl But are not limited to, one or more of methyldichlorosilane.

The non-isocyanate-based first monomer having a curable functional group may be contained in an amount of 0.1 to 10 mol%, for example, 1 to 5 mol% based on the total molar amount of the first monomer + the second monomer + the third monomer, The cohesive force and the elastic force of the back pressure-sensitive adhesive itself can be improved. The non-isocyanate-based second monomer having no curable functional group may be contained in an amount of 50 to 98 mol%, for example, 80 to 95 mol% based on the total molar amount of the first monomer + the second monomer + the third monomer, The modulus of elasticity of the pressure-sensitive adhesive after curing can be improved. The third monomer having an isocyanate group may be contained in an amount of 0.1 to 10 mol%, for example, 1 to 5 mol%, based on the total molar amount of the first monomer + the second monomer + the third monomer, and the cohesive force And the substrate film.

In one embodiment, the isocyanate group-containing silicone polymer may be a linear siloxane oligomer or polymer having a curable functional group, an isocyanate group, and an aliphatic hydrocarbon group and / or an aromatic hydrocarbon group. The aliphatic hydrocarbon group and / or the aromatic hydrocarbon group can help form a matrix of the adhesive film. Specifically, the isocyanate group-containing silicone polymer may include the following formula (1), (2) and (3)

≪ Formula 1 >

(2)

(3)

Rc, Rd, Re, Rf, Rg and Rh are each independently selected from the group consisting of hydrogen, an unsubstituted alkyl group having 1 to 10 carbon atoms, an unsubstituted alkyl group having 1 to 10 carbon atoms, An aryl group having 6 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, an unsaturated hydrocarbon group having 2 to 12 carbon atoms having a double bond at the terminal thereof, an alkyl group having 1 to 10 carbon atoms having an isocyanate group, and Ra, Rb , At least one of Rc, Rd, Re, Rf, Rg and Rh is an unsaturated hydrocarbon group having 2 to 12 carbon atoms having a double bond at the terminal thereof and at least one of Ra, Rb, Rc, Rd, Re, Is an alkyl group having 1 to 10 carbon atoms having an isocyanate group). More specifically, the isocyanate group-containing silicone polymer may include repeating units of the above-mentioned formula (1) and the above-mentioned formulas (2) and (3) at the terminal.

For example, the isocyanate group-containing silicone polymer may be a vinyl group and an isocyanate group-containing polydimethylsiloxane (PDMS). In an embodiment, the vinyl and isocyanate group-containing polydimethylsiloxane is selected from the group consisting of phenylmethyldimethoxysilane (PMDMS), dimethyldimethoxysilane (DMDMS), vinylmethyldimethoxysilane (VMDMS), isocyanatopropylmethyldimethoxysilane IPMDMS), and specifically can be prepared by hydrolysis, polymerization and end capping using water and a base of PMDMS, DMDMS, VMDMS, IPMDMS. In this case, VMDMS and IPMDMS may be contained in an amount of 0.1 to 10 mol%, for example, 0.1 to 5 mol%, based on the total molar amount of PMDMS, DMDMS, VMDMS and IPMDMS, respectively. .

Specifically, the isocyanate group-containing silicone polymer may include a repeating unit represented by the following formula (4):

≪ Formula 4 >

0 < y < 0.3, 0 < w < 0.3, and Me is a methyl group.

For example, an isocyanate-containing silicone polymer may be represented by the following formula (5)

&Lt; Formula 5 >

0 < y < 0.3, 0 < w < 0.3, and Me is a methyl group).

The isocyanate group-containing silicone polymer may have a number average molecular weight (Mn) of 10,000 to 500,000 g / mol, and the matrix of the adhesive film may be formed in the above range.

The isocyanate group-containing silicone polymer may be contained in an amount of 10 to 90 parts by weight, for example, 10 to 60 parts by weight, based on 100 parts by weight of the sum of the isocyanate group-containing silicone polymer and the silicone adhesive resin. Can be improved.

The silicone curing agent can be cured with an isocyanate group-containing silicone polymer to form a matrix of the adhesive film.

The silicone curing agent is a monomolecular or oligomer having two or more -Si-H groups capable of hydrosilylation with the curable functional group of the silicone polymer and can be activated by heat or UV to react with the hydrosilyl. Particularly, the curing agent having a siloxane unit is excellent in compatibility with a silicone polymer, and may have an effect of facilitating the application of the pressure-sensitive adhesive composition. The silicone hardener may be a non-isocyanate silicone hardener.

The silicone curing agent may comprise the following structural formulas (6), (7) and (8)

(6)

&Lt; Formula 7 >

(8)

R 1, R 2, R 1, R 2, R 3, R 4, R 5, R 6 and R 7 are independently selected from the group consisting of hydrogen, an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms And one or more of Ri, Rj, Rk, Rl, Rm, Rn, Ro and Rp is hydrogen. The 'silyloxy group' means an -Si-O- group having an alkyl group having 1 to 10 carbon atoms or a hydrogen atom. Specifically, the silicone hardener may include one or more of the repeating units of formula (6) and the formula (7) and (8) at the end.

For example, the silicone curing agent may be represented by the following formula (9), and may specifically include a copolymer of dimethylsiloxane and methylhydrosiloxane:

&Lt; Formula 9 >

(In the above formula (9), Me is a methyl group, and m and n are 0 < m? 0.5 and 0.5 <

In the specific examples, the silicone curing agent may contain 0.1 to 5 times, preferably 0.5 to 3 times, the number of moles of the? IH group with respect to the total number of moles of? I-vinyl groups, and the adhesion and cohesion .

The silicone curing agent may be contained in an amount of 0.1 to 10 parts by weight, for example, 1 to 6 parts by weight based on 100 parts by weight of the sum of the isocyanate group-containing silicone polymer and the silicone adhesive resin, and may have a desired level of cohesive force and cohesive force .

The silicone adhesive resin is a component included in the adhesive film to have adhesive strength. When the silicone adhesive resin alone is included, the matrix of the adhesive film is not properly formed, and the durability of the adhesive film may be deteriorated.

The silicone adhesive resin is a resin composed of two or more of R ²¹ R ²² R ²³ SiO _1/2 , R ²⁴ R ²⁵ SiO _2/2 , R ²⁶ SiO _3/2 , and SiO _4/2 , for example, R ²¹ R ²² R ^{23 An} MQ type resin composed of SiO _1/2 and SiO _4/2 or a DT resin composed of R ²⁴ R ²⁵ SiO _2/2 and R ²⁶ SiO _3/2 and R ²¹ and R ²² , R ²³ , R ²⁴ , R ²⁵ and R ²⁶ each independently may include a functional group capable of reacting with the silicone polymer, and specifically may be an alkyl group having 1 to 5 carbon atoms or an alkylene group having 2 to 5 carbon atoms, But it is not necessarily limited thereto.

The silicone adhesive resin may have a number average molecular weight of 1,000 to 10,000 g / mol, and the adhesive strength can be ensured within the above range.

The silicone adhesive resin may be contained in an amount of 10 to 90 parts by weight, for example, 30 to 70 parts by weight, based on 100 parts by weight of the sum of the isocyanate group-containing silicone polymer and the silicone adhesive resin, and a good level of durability .

The silicone-based pressure-sensitive adhesive composition for a polarizing plate of one embodiment of the present invention may further include at least one of a catalyst and an inhibitor.

Catalysts are intended to increase the rate of cure reaction and may include catalysts commonly used in hydrosilyl reactions. For example, the catalyst may be a platinum-based or rhodium-based catalyst, a complex of platinum and an organic compound, a platinum-vinylated organosiloxane complex, rhodium and olefin complexes, and a cyclopentadienyl-platinum complex. Specifically, the catalyst includes a vinyl alkyl siloxane platinum complex including a Karstedt catalyst, platinum black, chloroplatinic acid, chloroplatinic acid-olefin complex, chloroplatinic acid-alcohol coordination compound, trimethyl (methylcyclopentadienyl) can do.

The catalyst may be contained in an amount of 10 to 2,000 ppm, for example, 100 to 1,000 ppm, based on the isocyanate group-containing silicone polymer in terms of the weight of the metal. In this range, the curing reaction rate can be sufficiently increased and the use of an unnecessary catalyst have.

The inhibitor suppresses the action of the catalyst at room temperature and does not inhibit the catalyst during curing, thereby forming the adhesive film and curing the adhesive film. The inhibitor may be an inhibitor commonly used in silicone curing. For example, the inhibitor may be selected from the group consisting of acetylenic alcohols including 3,5-dimethyl-1-hexyn-3-ol, pyridine, phosphine, organic phosphite, unsaturated amide, dialkylcarboxylate, dialkyl acetylenedicarboxyl An alkylated maleate, a diallyl maleate, and the like.

The inhibitor may be included at from 500 to 3,000 ppm, for example, from 800 to 2,000 ppm, based on the isocyanate group-containing silicone polymer, and the inhibition and curing of the catalyst depending on the temperature can be controlled within the range.

The silicone-based pressure-sensitive adhesive composition for a polarizing plate of one embodiment of the present invention may further comprise a silane coupling agent. The silane coupling agent can increase the adhesion between the adhesive film and the liquid crystal panel (e.g. glass).

As the silane coupling agent, those conventionally known to those skilled in the art can be used. For example, silicon compounds having an epoxy structure such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane and 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane; A polymerizable unsaturated group-containing silicon compound such as vinyltrimethoxysilane, vinyltriethoxysilane and (meth) acryloxypropyltrimethoxysilane; Containing silicon compounds such as 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane. ; 3-chloropropyltrimethoxysilane, and a silane coupling agent having an isocyanate group, but is not limited thereto.

The silane coupling agent having an isocyanate group may include at least one silane coupling agent represented by the following formula (18). As a result, the silicone-based pressure-sensitive adhesive composition for a polarizing plate of the present invention can further improve durability.

[Chemical Formula 18]

(In the above screen hwaksik 18, Z is a vinyl group, an amino group, a thiol group or an isocyanate group, R ₁ is alkylene group, arylene group, alkylaryl group or arylalkyl group having a carbon number of 1-10, R _2, R _3, and R ₄ is an alkyl group having 1-10 carbon atoms, an aryl group, an alkylaryl group or an arylalkyl group)

Specifically, in the silane coupling agent represented by the general formula (18), Z is a vinyl group, an amino group, a thiol group or an isocyanate group, preferably an isocyanate group, but is not limited thereto. R ₁ is an alkylene group, an arylene group, an alkylarylene group or an arylalkylene group having 1-10 carbon atoms and may be, for example, methylene, ethylene, propylene, butylene, pentylene, hexylene, It is not. R ₂ , R ₃ and R ₄ are an alkyl group, an aryl group, an alkylaryl group or an arylalkyl group having 1-10 carbon atoms and may be, for example, methyl, ethyl, propyl, butyl, pentyl or hexyl But are not necessarily limited thereto. The silane coupling agent represented by the above formula (18) may include, for example, at least one of (triethoxysilyl) propyl isocyanate and (trimethoxysilyl) propyl isocyanate.

The silane coupling agent may be contained in an amount of 0.001 to 10 parts by weight, for example, 0.01 to 5 parts by weight, based on 100 parts by weight of the sum of the isocyanate group-containing silicone polymer and the silicone adhesive resin. have.

The silicone-based pressure-sensitive adhesive composition for a polarizing plate of one embodiment of the present invention may further comprise a solvent. The solvent is not particularly limited, but methyl ethyl ketone and the like can be used. The pressure-sensitive adhesive composition may further contain conventional additives such as an ultraviolet absorber and an antioxidant.

The silicone-based pressure-sensitive adhesive composition for a polarizing plate of the present invention may have a viscosity of 1,000 to 6,000 cPs at 25 ° C. Within the above range, the thickness of the adhesive film can be easily adjusted, there is no unevenness in the adhesive film, and the coated surface can have a uniform effect.

Hereinafter, the silicone-based pressure-sensitive adhesive composition for a polarizing plate of another embodiment of the present invention will be described.

The silicone-based pressure-sensitive adhesive composition for a polarizing plate of another embodiment of the present invention may include a silicone polymer, an isocyanate group-containing silicone hardener, and a silicone adhesive resin. As a result, the silicone-based pressure-sensitive adhesive composition for a polarizing plate of the present invention can realize both the effects due to the silicon and isocyanate groups described above. The silane coupling agent may be included in an amount of 0.001 to 10 parts by weight, for example, 0.01 to 5 parts by weight, based on 100 parts by weight of the sum of the silicone polymer and the silicone adhesive resin. And a pressure-sensitive adhesive composition having excellent durability within the above range can be obtained.

Sensitive adhesive composition for a polarizing plate of the present invention is substantially the same as the silicone-based pressure-sensitive adhesive composition for a polarizing plate of the present invention except that it contains a silicone polymer and an isocyanate group-containing silicone curing agent instead of the isocyanate group- Hereinafter, only the silicon polymer and the isocyanate group-containing silicone curing agent will be described.

The silicone polymer has no adhesive force but can form a matrix of the adhesive film upon formation of the adhesive film from the adhesive composition and enhance the durability of the adhesive film.

The silicone polymer may be a linear silicone-based polymer such as a non-isocyanate-based linear silicone-based polymer, and may be a siloxane oligomer or polymer having a curable functional group. For example, the first monomer may be a non-isocyanate-based monomer having a curable functional group, And at least one non-isocyanate-based second monomer having at least one non-isocyanate group.

The non-isocyanate-based first monomer having a curable functional group may be contained in an amount of 0.1 to 10 mol%, for example, 1 to 5 mol%, of the total molar amount of the first monomer + second monomer, The cohesive force and the elastic force can be improved.

In one embodiment, the silicone polymer can be a linear siloxane oligomer or polymer having a curable functional group and an aliphatic hydrocarbon group and / or an aromatic hydrocarbon group. The aliphatic hydrocarbon group and / or the aromatic hydrocarbon group can help form a matrix of the adhesive film. Specifically, the silicone polymer may comprise the following formula (10), (11), and (12):

&Lt; Formula 10 >

&Lt; Formula 11 >

&Lt; Formula 12 >

Wherein R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ , R ₇ and R ₈ are each independently selected from the group consisting of hydrogen, alkyl group, having 1 to 10 carbon atoms in the alkoxy group, an aryl group having 6 to 20 carbon atoms, having a carbon number of 7 to 20 arylalkyl group, having 2 to 12 carbon atoms having a double bond at the terminal of the unsaturated hydrocarbon group, R _1, R _2, R ₃ , At least one of R ₄ , R ₅ , R ₆ , R ₇ and R ₈ is an unsaturated hydrocarbon group having 2 to 12 carbon atoms and having a double bond at the terminal). More specifically, the silicone polymer may include repeating units of the above formula (10) and the above formula (11) and (12) at the terminal.

For example, the silicone polymer may be a vinyl group-containing polydimethylsiloxane (PDMS). In embodiments, the vinyl group-containing polydimethylsiloxane may be prepared from a composition comprising phenylmethyldimethoxysilane (PMDMS), dimethyldimethoxysilane (DMDMS), vinylmethyldimethoxysilane (VMDMS), and specifically PMDMS, DMDMS can be prepared by hydrolysis, polymerization and end capping of water and base of VMDMS. In this case, the VMDMS may be contained in an amount of 0.1 to 10 mol%, for example, 1 to 5 mol% based on the total molar amount of PMDMS, DMDMS, and VMDMS, and the manifestation of the adhesion performance and the modulus of elasticity of the pressure-

Specifically, the silicone polymer may comprise repeating units of formula (13)

&Lt; Formula 13 >

Y is 0, y is 0, y is 0, y is 0, y is 0, y is 0, y is 0, y is 0, and Me is a methyl group.

For example, the silicone polymer may be represented by the following formula:

&Lt; Formula 14 >

(Wherein x, y and z are 0? X <0.5, 0? Y <0.9, 0 <z <0.3, and Me is a methyl group).

The silicone polymer may have a number average molecular weight of 10,000 to 500,000 g / mol, and the matrix of the adhesive film may be formed in the above range.

The silicone polymer may be contained in an amount of 10 to 90 parts by weight, for example, 50 to 90 parts by weight, based on 100 parts by weight of the sum of the silicone polymer and the silicone pressure-sensitive adhesive resin, and the durability of the pressure-sensitive adhesive in the above range and required release force can be obtained.

The isocyanate group-containing silicone curing agent cures with the silicone polymer to form a matrix of the pressure-sensitive adhesive film, and the adhesion of the substrate to the base layer having the adhesive film and the hydroxyl group can be increased due to the isocyanate group.

The isocyanate group-containing silicone curing agent may have one or more -Si-H groups and may be activated by heat or UV to react with hydrosilyl, react with a base layer having at least one isocyanate group and having a hydroxyl group, . Particularly, the curing agent having a siloxane unit is excellent in compatibility with a silicone polymer, and may have an effect of facilitating the application of the pressure-sensitive adhesive composition.

The isocyanate group-containing silicone curing agent may comprise the following structural formulas (15), (16) and (17)

&Lt; Formula 15 >

&Lt; Formula 16 >

&Lt; Formula 17 >

Wherein R ₉ , R ₁₀ , R ₁₁ , R ₁₂ , R ₁₃ , R ₁₄ , R ₁₅ and R ₁₆ each independently represent hydrogen, an unsubstituted C1-C18 alkyl group, to 10 alkyl group, an alkoxy group having 1 to 10 carbon atoms, an aryl group having 6 to 20 carbon atoms, silyl oxy group, an alkyl group having 1 to 10 carbon atoms having an isocyanate group, R _9, R _10, R _11, R _12, R ₁₃ At least one of R ₁₄ , R ₁₅ and R ₁₆ is hydrogen and at least one of R ₉ , R ₁₀ , R ₁₁ , R ₁₂ , R ₁₃ , R ₁₄ , R ₁₅ and R ₁₆ is isocyanate Group having 1 to 10 carbon atoms). The 'silyloxy group' means an -Si-O- group having an alkyl group having 1 to 10 carbon atoms or a hydrogen atom. The isocyanate group-containing siloxane curing agent may comprise one or more of the repeating units of formula (15) and the formula (16) and (17) at the ends.

The isocyanate group-containing silicone curing agent may be contained in an amount of 0.1 to 10 parts by weight, for example, 1 to 6 parts by weight based on 100 parts by weight of the sum of the silicone polymer and the silicone adhesive resin, and the cohesive force and durability of the pressure- .

The isocyanate group-containing silicone curing agent can be polymerized by using a silicone monomer having an isocyanate group in the production of the silicone curing agent.

Hereinafter, the silicone-based pressure-sensitive adhesive composition for a polarizing plate of another embodiment of the present invention will be described.

The silicone-based pressure-sensitive adhesive composition for a polarizing plate of another embodiment of the present invention may contain the above-mentioned isocyanate group-containing silicone polymer, the above-mentioned isocyanate group-containing silicone curing agent and silicone adhesive resin. The silane coupling agent may be added in an amount of 0.001 to 10 parts by weight, for example, 0.01 to 10 parts by weight per 100 parts by weight of the sum of the isocyanate group-containing silicone polymer and the isocyanate group-containing silicone adhesive resin. To 5 parts by weight, and a pressure-sensitive adhesive composition having excellent durability within the above range can be obtained.

The isocyanate group-containing silicone polymer, the isocyanate group-containing silicone hardener and the silicone adhesive resin are substantially the same as the above-mentioned isocyanate group-containing silicone polymer, isocyanate group-containing silicone hardener and silicone adhesive resin.

Hereinafter, the polarizing plate of the present invention will be described.

The polarizing plate of the present invention comprises the pressure-sensitive adhesive film for a polarizing plate of the present invention or the pressure-sensitive adhesive film formed of the pressure-sensitive adhesive composition for a polarizing plate of the present invention. Specifically, the polarizing plate may include a polarizer, a base layer formed on at least one surface of the polarizer and having a hydroxyl group, and an adhesive film for a polarizing plate formed on one surface of the base layer having a hydroxyl group. Since the polarizing plate of the present invention includes the pressure-sensitive adhesive film or the pressure-sensitive adhesive film of the present invention, the protective film is not separated even at high temperature and / or high humidity, so that durability is good and the pressure-sensitive adhesive may not be detached. In particular, polarizers in which the protective film is a cellulose ester film may be free of yellowing at high temperature and / or high humidity.

Hereinafter, a polarizing plate of one embodiment of the present invention will be described with reference to Fig.

Referring to FIG. 1, a polarizer 100 of an embodiment of the present invention includes a polarizer 110; A first protective film 120 formed on one surface of the polarizer 110; A second protective film 130 formed on the other surface of the polarizer 110; And the second protective film 130 may include a substrate layer having a hydroxyl group and the adhesive film 140 may be formed on the lower surface of the second protective film 130, It may be formed as an adhesive film.

The polarizer 110 polarizes natural or artificial light, and can be made of a polyvinyl alcohol-based film. For example, the polarizer is prepared by dyeing iodine or a dichroic dye to a modified polyvinyl alcohol film such as a partially-formalized polyvinyl alcohol film or an acetoacetyl-modified polyvinyl alcohol film and stretching it in a certain direction. Specifically, it is produced through a swelling process, a dyeing process, and a stretching process. Methods of performing each step are commonly known to those skilled in the art.

The polarizer 110 may have a thickness of 10 탆 to 50 탆 and can be used in an optical display device in the above range.

The first protective film 120 is formed on one surface of the polarizer to protect the polarizer, and may include an optically transparent normal film. For example, it is possible to use a polyester type, a polycarbonate type, a polycarbonate type, a polyethylene terephthalate (PET) or the like including a cyclic polyolefin type including a cyclic olefin polymer (COP) Polyether sulfone type, polysulfone type, polyamide type, polyimide type, polyolefin type, polyacrylate type, polyvinyl alcohol type, polyvinyl chloride type, polyvinyl chloride type Lt; RTI ID = 0.0 &gt; and / or &lt; / RTI &gt;

The thickness of the first protective film 120 may be 10 탆 to 200 탆, for example, 30 탆 to 120 탆, and can be used in an optical display device in the above range.

Although not shown in FIG. 1, a functional coating layer may be further formed on the upper surface of the first protective film 120 to provide an additional function to the polarizing plate. For example, a hard coating layer, a translucent layer, have.

The second protective film 130 may be an optically transparent protective film having a hydroxyl group on its surface and in particular a cellulose ester film. For example, triacetyl cellulose, diacetyl cellulose, A cellulose ester-based film that has been exposed.

The thickness of the second protective film 130 may be 10 탆 to 200 탆, for example, 30 탆 to 120 탆, and can be used in an optical display device in the above range.

The adhesive film 140 may be formed by coating the adhesive composition of one embodiment of the present invention on one side of the second protective film 130 and aging and / or curing the adhesive film 140. The thickness of the adhesive film 140 may be 5 to 100 [ .

Although not shown in FIG. 1, the adhesive film 140 is laminated on one surface of a liquid crystal display panel (not shown in FIG. 1) to fix the polarizing plate 100 to the liquid crystal display panel.

1, an adhesive layer may be formed between the polarizer 110 and the first protective film 120 and between the polarizer 110 and the second protective film 130, And may be formed of an adhesive for a polarizing plate. Specifically, the adhesive for a polarizing plate may include an aqueous adhesive including a polyvinyl alcohol resin, and a photo-curable adhesive including a (meth) acrylic adhesive resin.

Hereinafter, an optical display device according to an embodiment of the present invention will be described with reference to FIG. 2 is a cross-sectional view of an optical display device according to an embodiment of the present invention.

2, an optical display device 200 according to an embodiment of the present invention includes a liquid crystal display panel 210, a first polarizer 220 formed on one side of the liquid crystal display panel 210, And a second polarizing plate 230 formed between the liquid crystal display panel 210 and the light source 240. One or more of the first polarizing plate 220 and the second polarizing plate 230 may be a polarizing plate . &Lt; / RTI &gt;

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Production Example 1

DMDMS: VMDMS: IPMDMS = 30: 65: 3: 2, based on the total 100 molar ratio, based on the total 100 molar amount of dimethyldimethoxysilane (PMDMS), dimethyldimethoxysilane (DMDMS), and 3-isocyanatopropylmethyl dimethoxysilane (VMDMS) Hydrolysis was carried out under distilled water / KOH for 1 hour. After the reaction was carried out at 90 ° C, Toluene and H ₂ O were added, the temperature was lowered to room temperature, and washing with H ₂ O was carried out. Thereafter, Vi-MM (1,3-divinyltetramethyldisiloxane) was added to perform end capping at 50 ° C for 5 hours, washed with H ₂ O at room temperature, and the solvent was removed by evaporator to prepare an isocyanate group- Respectively.

Production Example 2

Dimethyldimethoxysilane (PMDMS), dimethyldimethoxysilane (DMDMS) and vinylmethyldimethoxysilane (VMDMS) were weighed in PMDMS: DMDMS: VMDMS = 30: 67: 3 based on the total 100 mole ratio and then hydrolysis was carried out at 70 ° C for 1 hour under distilled water / KOH. After the reaction was carried out at 90 ° C, Toluene and H ₂ O were added, the temperature was lowered to room temperature, and washing with H ₂ O was carried out. After that, Vi-MM (1,3-divinyltetramethyldisiloxane) was added and the end capping was performed at 50 ° C for 5 hours. The resultant was washed with H ₂ O at room temperature and the solvent was removed by evaporator to obtain a silicone polymer (non- .

Production Example 3

A silicone polymer was prepared in the same manner as in Production Example 1, except that the total molar ratio based on 100 mol was changed to PMDMS: DMDMS: VMDMS: IPMDMS = 30: 65: 1: 4.

Production Example 4

A silicone polymer was prepared in the same manner as in Production Example 2 except that the total molar ratio based on 100 mol was changed to PMDMS: DMDMS: VMDMS = 30: 69: 1.

Example 1

50 parts by weight of an isocyanate group-containing silicone polymer of Production Example 1, 5 parts by weight of a silicone hardener HMS-301 (Gelest), 50 parts by weight of 7657 (Dow Corning) containing MQ resin as a silicone pressure- 1.8CS, Umicore) and 1000 ppm of surfactin (inhibin) were blended to prepare a silicone-based pressure-sensitive adhesive composition for a polarizing plate.

Example 2

50 parts by weight of the silicone polymer of Production Example 2, 5 parts by weight of silicone hardener HMS-301 (Gelest), 50 parts by weight of 7657 (Dow Corning) containing MQ resin as silicone adhesive resin, Silyl) propyl isocyanate, 500 ppm of Karstedt catalyst (PT-CS-1.8CS, Umicore) and 1000 ppm of surfynol as an inhibitor were mixed to prepare a silicone-based pressure-sensitive adhesive composition for a polarizing plate.

Example 3

A silicone-based pressure-sensitive adhesive composition for a polarizing plate was prepared in the same manner as in Example 1, except that 50 parts by weight of the isocyanate group-containing silicone polymer of Production Example 3 was used instead of 50 parts by weight of the isocyanate group-containing silicone polymer of Production Example 1.

Example 4

A silicone-based pressure-sensitive adhesive composition for a polarizing plate was prepared in the same manner as in Example 2 except that 50 parts by weight of the silicone polymer of Production Example 4 was used instead of 50 parts by weight of the silicone polymer of Production Example 2.

Comparative Example 1

Nitrogen gas was introduced into a reactor equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen introduction tube to replace the air in the reactor with nitrogen gas. Then, 100 parts by weight of butyl acrylate, 2.0 parts by weight of 2-hydroxyethyl acrylate, 1.0 part by weight of acrylic acid and 100 parts by weight of ethyl acetate as a solvent were added to the reactor. Thereafter, 0.1 part by weight of AIBN (azobisisobutyronitrile) as a polymerization initiator was added dropwise to the reaction apparatus over 2 hours and reacted at 65 DEG C for 8 hours to obtain an acrylic copolymer solution. The molecular weight of the obtained acrylic copolymer was 1.1 million g / mol. The weight average molecular weight of the acrylic copolymer was measured using a column (Shodex LF-804) and using styrene-divinylbenzene as a mobile phase. 100 parts by weight of the acrylic copolymer thus prepared, 0.3 part by weight of a curing agent TD-75 (Soken, trimethylolpropane modified isocyanate curing agent, solid content 75%), 0.3 part by weight of a silane coupling agent A-50 (Soken, an acetacetyl silane coupling agent, 50%) were added to prepare an acrylic pressure-sensitive adhesive composition for a polarizing plate.

Comparative Example 2

50 parts by weight of the silicone polymer of Production Example 2, 5 parts by weight of silicone hardener HMS-301 (Gelest), 50 parts by weight of 7657 (Dow Corning) containing MQ resin as silicone adhesive resin, 0.05 parts by weight of trimethoxysilane (KBM-4-3, Shin-Etsu), 500 parts by weight of Karstedt catalyst (PT-CS-1.8CS, Umicore) and 1000 ppm of surfynol as an inhibitor were mixed to prepare a silicone-based pressure sensitive adhesive composition for a polarizing plate.

The following properties of the pressure-sensitive adhesive composition for a polarizing plate of Examples and Production Examples or the polarizing plate produced using the same were evaluated, and the results are shown in Table 1.

Substrate adhesion
(gf / inch) Cutting
Endurance reliability High temperature
(105 ° C) High temperature and high humidity
(85 캜, relative humidity 85%) Example 1 1700 ○ ○ ○ Example 2 1400 ○ ○ ○ Example 3 2000 ○ ○ ○ Example 4 1300 ○ ○ ○ Comparative Example 1 2100 ○ × (yellowing) ○ Comparative Example 2 800 × ○ × (TAC separation)

As shown in Table 1, the adhesive film for a polarizing plate of the present invention has excellent adhesion to a substrate and excellent cuttability with respect to a hydroxyl group-containing TAC film, and is excellent in the yellowing of a TAC film, separation of a TAC film, There was no separation between the two, and the durability was good.

On the other hand, Comparative Example 1, which is an acrylic adhesive film, is excellent in adhesion to a substrate, but yellowing of the TAC film occurs at high temperature or high temperature / high humidity, and the TAC film is separated and the reliability of endurance of the polarizer is deteriorated.

Comparative Example 2, which is a silicone-based adhesive film but does not include an isocyanate group, has a problem of poor adhesion with the base film, resulting in poor durability.

How to measure property

1) Adhesive strength to substrate: A pressure sensitive adhesive composition of Example and Comparative Example was coated on a polyethylene terephthalate (PET) film (A4300) to a thickness of 20 탆 and dried at 90 캜 for 4 minutes to form a pressure sensitive adhesive layer. Konika, contact angle: 25 [deg.]) And an adhesive layer were laminated and left at 35 DEG C for 72 hours to prepare a sample. The adhesive strength of the substrate, which is peeled off when the interface between the TAC film and the pressure-sensitive adhesive was peeled off at a peeling angle of 180 °, was measured using a TA.XT.plus (TA instrument) equipment.

2) Cutting property: A polyvinyl alcohol film (degree of saponification: 99.5, degree of polymerization: 2000) having a thickness of 80 탆 was immersed in a 0.3% iodine aqueous solution, and was drawn and then stretched to give a draw ratio of 5.0. Subsequently, the stretched polyvinyl alcohol film was immersed in a boric acid solution of 3% concentration and an aqueous solution of 2% potassium iodide to perform color correction, and then dried at 50 DEG C for 4 minutes to prepare a polarizer (thickness 25 mu m). On both sides of the polarizer, a TAC film subjected to a saponification treatment according to 1) was laminated with an adhesive for a polarizing plate. The pressure-sensitive adhesive composition of Example and Comparative Example was coated on one side of the TAC film and allowed to stand at 25 占 폚 for 24 hours to prepare a polarizing plate and attached to the glass plate. After cutting with a supper cutter, the cut section was observed with a microscope to evaluate whether the adhesive film was missing or not. &Quot; ○ "when the adhesive was not peeled off, and" X "

3) Endurance reliability: A polarizing plate was prepared in the same manner as in 2), and the polarizing plate was cut into a width x length (140 mm x 70 mm) and lapped on an alkali-free glass plate. 105 ° C, or 85 ° C and 85% constant temperature and humidity conditions for 500 hours, and the state of the polarizing plate and the adhesive film were evaluated. When there is no yellowing of the TAC film, separation of the TAC film, and separation of the polarizer plate, the reliability of endurance is poor when the reliability of the endurance is good, "○", yellowing of the TAC film, separation of the TAC film, Quot; x ".

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (21)

A silicone adhesive film for a polarizing plate having a base adherence of 1000 gf / inch or more to a base layer having a hydroxyl group.
The silicone-based pressure-sensitive adhesive film for a polarizing plate according to claim 1, wherein the pressure-sensitive adhesive film has an isocyanate group.
The silicone adhesive film for a polarizing plate according to claim 1, wherein the substrate layer having a hydroxyl group is any one of a protective film, a protective coating layer and a polarizer layer.
The silicone-based pressure-sensitive adhesive film for polarizing plate according to claim 1, wherein the base layer having a hydroxyl group comprises a cellulose ester-based film.
The silicone-based pressure-sensitive adhesive film for a polarizing plate according to claim 4, wherein the cellulose ester-based film is a film having a contact angle of 20 ° to 30 °.
The silicone-based pressure-sensitive adhesive film for a polarizing plate according to claim 1, wherein the pressure-sensitive adhesive film has a thickness of 5 탆 to 100 탆.
The silicone-based pressure-sensitive adhesive film for a polarizing plate according to claim 1, wherein the pressure-sensitive adhesive film is formed from a pressure-sensitive adhesive composition comprising at least one of an isocyanate group-containing silicone polymer and an isocyanate group-containing silicone curing agent.
The silicone-based pressure-sensitive adhesive film for a polarizing plate according to claim 1, wherein the pressure-sensitive adhesive film is formed from a pressure-sensitive adhesive composition comprising an isocyanate group-containing silicone polymer, a silicone curing agent and a silicone pressure-sensitive adhesive resin.
The silicone-based pressure-sensitive adhesive film for a polarizing plate according to claim 8, wherein the isocyanate group-containing silicone polymer is a copolymer of a silicone-based monomer mixture and contains 0.1 mol% to 10 mol% of a monomer having an isocyanate group in 100 mol% of the silicon-based monomer mixture.
9. The silicone-based pressure-sensitive adhesive film for polarizing plate according to claim 8, wherein the isocyanate group-containing silicone polymer comprises a repeating unit represented by the following formula (4)
&Lt; Formula 4 >

0 < y < 0.3, 0 < w < 0.3, and Me is a methyl group.
The silicone adhesive film for a polarizing plate according to claim 8, wherein the isocyanate group-containing silicone polymer has a number average molecular weight (Mn) of 10,000 to 500,000 g / mol.
The pressure-sensitive adhesive composition according to claim 8, wherein the pressure-sensitive adhesive composition comprises 10 to 90 parts by weight of an isocyanate group-containing silicone polymer, 0.1 to 10 parts by weight of a silicone curing agent, and 10 to 10 parts by weight of a silicone pressure- To 90 parts by weight of a pressure-sensitive adhesive composition.
The silicone-based pressure-sensitive adhesive film for a polarizing plate according to claim 1, wherein the pressure-sensitive adhesive film is formed from a pressure-sensitive adhesive composition comprising a silicone polymer, an isocyanate group-containing silicone curing agent, and a silicone pressure-sensitive adhesive resin.
14. The silicone adhesive film for a polarizing plate according to claim 13, wherein the silicone polymer comprises a repeating unit represented by the following formula (13): < EMI ID =
&Lt; Formula 13 &gt;

0, y < 0.9, 0 < z < 0.3, and Me is a methyl group.
The pressure-sensitive adhesive composition according to claim 13, wherein the pressure-sensitive adhesive composition comprises 10 to 90 parts by weight of a silicone polymer, 0.1 to 10 parts by weight of an isocyanate group-containing silicone curing agent, and 10 to 90 parts by weight of a silicone pressure- Wherein the pressure-sensitive adhesive composition is a pressure-sensitive adhesive composition.
The silicone-based pressure-sensitive adhesive film for a polarizing plate according to claim 1, wherein the pressure-sensitive adhesive film is formed from a pressure-sensitive adhesive composition comprising a silane coupling agent.
The silicone adhesive film for a polarizing plate according to claim 16, wherein the silane coupling agent comprises at least one silane coupling agent represented by the following formula (18)
[Chemical Formula 18]

(In the above screen hwaksik 18, Z is a vinyl group, an amino group, a thiol group or an isocyanate group, R ₁ is alkylene group, arylene group, alkylaryl group or arylalkyl group having a carbon number of 1-10, R _2, R _3, and R ₄ is an alkyl group having 1-10 carbon atoms, an aryl group, an alkylaryl group or an arylalkyl group).
A silicon-containing pressure-sensitive adhesive composition for a polarizing plate further comprising a silane coupling agent represented by the following formula (18) in a composition comprising at least one of an isocyanate group-containing silicone polymer and an isocyanate group-
[Chemical Formula 18]

(In the above screen hwaksik 18, Z is a vinyl group, an amino group, a thiol group or an isocyanate group, R ₁ is alkylene group, arylene group, alkylaryl group or arylalkyl group having a carbon number of 1-10, R _2, R _3, and R ₄ is an alkyl group having 1-10 carbon atoms, an aryl group, an alkylaryl group or an arylalkyl group).
The silicone pressure-sensitive adhesive composition for a polarizing plate according to claim 18, wherein the silane coupling agent is contained in an amount of 0.001 to 10 parts by weight based on 100 parts by weight of the composition comprising at least one of the isocyanate group-containing silicone polymer and the isocyanate group-containing silicone curing agent.
A polarizer comprising a silicone-based pressure-sensitive adhesive film for a polarizing plate according to any one of claims 1 to 17, or a silicone-based pressure-sensitive adhesive film for a polarizing plate formed from the silicone-based pressure-sensitive adhesive composition for a polarizing plate according to any one of claims 18 to 19.
An optical display device comprising the polarizing plate of claim 20.

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