KR20190004562A - Adhesive composition for polarizing plate, adhesive film for polarizing plate prepared using the same, polarizing plate comprising the same and optical display apparatus comprising the same - Google Patents

Abstract

Provided are an adhesive composition for a polarizing plate, an adhesive film for a polarizing plate prepared by using the same, a polarizing plate comprising the same, and an optical display apparatus comprising the same. The adhesive composition for a polarizing plate includes a (meth)acrylic copolymer of a monomer mixture and a polyalkylene glycol modified isocyanate curing agent, wherein the (meth)acrylic copolymer of a monomer mixture includes a (meth)acrylic monomer having an alkyl group, a (meth)acrylic monomer having a hydroxyl group, a (meth)acrylic monomer having an aromatic group, a (meth)acrylic monomer having a tertiary amine group, and a (meth)acrylic monomer having a hetero-alicyclic group.

Description

TECHNICAL FIELD [0001] The present invention relates to a pressure-sensitive adhesive composition for a polarizing plate, a pressure-sensitive adhesive film for a polarizing plate produced therefrom, a polarizing plate including the same, and an optical display device including the polarizing plate. APPARATUS COMPRISING THE SAME}

The present invention relates to a pressure-sensitive adhesive composition for a polarizing plate, a pressure-sensitive adhesive film for a polarizing plate produced from the same, a polarizing plate comprising the same, and an optical display device comprising the same.

The liquid crystal display device includes a liquid crystal panel and a polarizing plate attached to both sides of the liquid crystal panel. The polarizing plate includes a polarizer and a protective film formed on one or both surfaces 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.

The adhesive film for a polarizing plate is coated on a release film to a predetermined thickness and then dried. The release film, the polarizing plate adhesive film, and the release film are laminated and packaged, stored and / or transported. The release film prevents the polarizing plate adhesive film from being contaminated from external foreign matter. However, during packaging, storage, and transportation of the polarizing plate adhesive film, the polarizing plate may come in contact with the solid particles outside, which may result in pressing of the adhesive film by the solid particles. This pressing of the adhesive film is called a dent. Although the release film is formed on the adhesive film, there is a limitation in solving the pressing of the adhesive film. The polarizing plate including the pressure-sensitive adhesive film having such a pressure-sensitive adhesive film can make the screen quality poor. On the other hand, the pressure sensitive adhesive film for a polarizing plate is adhered to a polarizing plate and then cut and processed. In this process, too, the pressing of the adhesive film by the solid particles may occur. Therefore, there is a demand for a pressure-sensitive adhesive film which can be restored even if the pressure-sensitive adhesive film is not pressed by solid particles or the like.

There is a method of increasing the content of the curing agent or a method of increasing the glass transition temperature of the (meth) acrylic copolymer in the adhesive film by a method of eliminating the dent of the adhesive film. However, when the content of the curing agent is increased, the polarizing plate may warp at a high temperature. Even when the glass transition temperature of the (meth) acrylic copolymer is increased, warping occurs at a high temperature or a creep value is lowered at a high temperature, so that light leakage and warping may be lowered.

The background art of the present invention is described in Japanese Laid-Open Patent Application No. 2015-010192.

It is an object of the present invention to provide a pressure-sensitive adhesive film capable of restraining the pressing of the pressure-sensitive adhesive film by solid particles during processing, cutting, packaging and / or storage of the pressure-sensitive adhesive film and / Sensitive adhesive composition for a polarizing plate.

Another object of the present invention is to provide a pressure-sensitive adhesive composition for a polarizing plate capable of realizing a pressure-sensitive adhesive film capable of suppressing warping and light leakage due to shrinkage of a polarizing plate at a high temperature.

Another object of the present invention is to provide a pressure-sensitive adhesive composition for a polarizing plate which is excellent in durability at high temperature or high temperature and high humidity, and can realize an adhesive film excellent in corrosion inhibition effect and reworkability when adhered to a metal adduct containing ITO film .

The pressure-sensitive adhesive composition for a polarizing plate of the present invention is a pressure-sensitive adhesive composition for a polarizing plate, which comprises (meth) acrylic monomers having an alkyl group, (meth) acrylic monomers having a hydroxyl group, (meth) acrylic monomers having an aromatic group, (Meth) acrylic copolymer and a polyalkylene glycol-modified isocyanate curing agent of a monomer mixture containing a (meth) acrylic monomer.

The pressure sensitive adhesive film for a polarizing plate of the present invention can be formed from the pressure sensitive adhesive composition for a polarizing plate of the present invention.

The polarizing plate of the present invention may include an adhesive film for a polarizing plate formed of the pressure-sensitive adhesive composition for a polarizing plate of the present invention.

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

The present invention provides a polarizing plate capable of suppressing the pressing of the pressure-sensitive adhesive film by solid particles during processing, cutting, packaging and storage of the pressure-sensitive adhesive film and / or realizing a pressure- To provide a pressure-sensitive adhesive composition.

The present invention provides a pressure-sensitive adhesive composition for a polarizing plate capable of realizing a pressure-sensitive adhesive film capable of suppressing warping and light leakage due to shrinkage of a polarizing plate at a high temperature.

The present invention provides a pressure-sensitive adhesive composition for a polarizing plate which is excellent in durability under high temperature or high temperature and high humidity, and can realize a pressure-sensitive adhesive film excellent in corrosion inhibition effect and reworkability when adhered to a metal adhesive containing ITO film.

1 is a conceptual diagram of measurement of a creep in this specification.
2 is a conceptual diagram of the measurement of light leakage in this specification.

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. 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.

It should be noted that the terms "upper" and "lower" in the present specification are based on the drawings and are not necessarily fixed to the upper and lower portions, .

In the present specification, "adhesive film for polarizing plate" and "pressure-sensitive adhesive composition for polarizing plate" may be referred to as "adhesive film" and "pressure-sensitive adhesive composition", respectively.

As used herein, "(meth) acrylic" means acrylic and / or methacrylic.

1, a creep test specimen 23 is laminated on the end of a sodalime glass plate 20 with an area of axb (for example, 15 mm x 15 mm), and a load W The distance for which the specimen for creep measurement 23 was pulled from the soda lime glass plate 20 was measured when the specimen 23 for creep measurement was pulled for 1000 seconds. The creep measurement specimen 23 includes a pressure-sensitive adhesive film 21 (thickness: 25 mu m) and a polarizing plate 22 formed on the pressure-sensitive adhesive film 21. The polarizing plate 22 includes a triacetylcellulose film, a polarizer, and a triacetylcellulose film which are sequentially laminated. The creep measuring temperature was 85 캜 and the load W was 1500 g. The creep can be measured using TEXTURE ANALYZER TA.XT PLUS (5 kg load cell, EKO Instruments).

Hereinafter, a pressure-sensitive adhesive composition for a polarizing plate according to an embodiment of the present invention will be described.

The pressure-sensitive adhesive composition for a polarizing plate of the present embodiment is a pressure-sensitive adhesive composition for a polarizing plate, which comprises (meth) acrylic monomers having an alkyl group, (meth) acrylic monomers having a hydroxyl group, (meth) acrylic monomers having an aromatic group, (Meth) acrylic copolymer and a polyalkylene glycol-modified isocyanate curing agent of a monomer mixture containing a (meth) acrylic monomer.

The polyalkylene glycol-modified isocyanate curing agent may include a curing agent in which isocyanate groups of some of the bifunctional or higher isocyanate curing agents are modified with polyalkylene glycols. The pressure-sensitive adhesive composition of the present embodiment can improve the dent even when the polarizer is not excessively used when the polarizer is tacked. By lowering the creep value at a high temperature, it is possible to suppress the warping and the light leakage of the polarizer at high temperatures. In particular, the pressure-sensitive adhesive composition can be restored to its original state at a high speed even if pressure due to solid particles is formed, thereby improving the processability.

Specifically, a specimen including an adhesive film formed from a pressure-sensitive adhesive composition for a polarizing plate on a glass substrate may have a bending value of less than 15 mm at 85 ° C. In the above range, the warpage of the polarizing plate is lowered at a high temperature, and the screen visibility can be improved even at a high temperature. Specifically, the dent measured for a release film, an adhesive film formed of a pressure-sensitive adhesive composition for a polarizing plate, and a polarizing plate directly formed in this order may be less than 9 占 퐉. Within the above range, it is possible to enhance the fairness of storage and transportation of the adhesive film, and improve the visibility of the screen.

The polyalkylene glycol-modified isocyanate curing agent may be prepared by mixing a polyalkylene glycol and an isocyanate curing agent having two or more functional groups at a predetermined molar ratio and then reacting at a predetermined temperature. The isocyanate group of some of the isocyanate curing agents reacts with the polyalkylene glycol and is denatured. The polyalkylene glycol-modified isocyanate curing agent can be prepared by mixing polyalkylene glycol: isocyanate curing agent having two or more functional groups at a molar ratio of 1: 2 to 1: 6 and reacting at 40 ° C to 70 ° C. At this time, a reaction catalyst such as DBTDL (dibutyltin dilaurate) or the like may be used to increase the reaction yield.

Preferably, the polyalkylene glycol-modified isocyanate curing agent may be a bifunctional isocyanate curing agent. As a result, the (meth) acrylic copolymer can be sufficiently cured and recovered within a short period of time even if a dent (pressing) occurs.

The polyalkylene glycol may have a number average molecular weight (Mn) of 300 g / mol to 5000 g / mol, preferably 400 g / mol to 3000 g / mol. Within this range, a warp inhibiting effect can be obtained at a high temperature, and the number average molecular weight of the curing agent is not excessively increased, so that the (meth) acrylic copolymer can be cured well and the dent improving effect can be obtained.

The polyalkylene glycol has plural repeating units of an alkylene glycol having a primary alcoholic carbon or a secondary alcoholic carbon and may be, for example, polypropylene glycol (PPG), polyethylene glycol (PEG) or the like. The isocyanate curing agent modified with a polyol having tertiary alcohol carbon (e.g., trimethylol propane) has a high stiffness at high temperatures, which may result in a deflection suppressing effect or a weak dent improving effect.

The bifunctional or higher isocyanate curing agent is not particularly limited as an isocyanate curing agent having two or more functional groups but includes xylene diisocyanate (XDI) including m-xylene diisocyanate and the like, 4,4'-methylene bis (phenyl isocyanate) (Phenyl isocyanate) (MDI), naphthalene diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and the like. Preferably, an isocyanate curing agent having an aromatic group such as methylene bis (phenyl isocyanate) including xylene diisocyanate including m-xylene diisocyanate and 4,4'-methylene bis (phenyl isocyanate) can be used. As a result, when the (meth) acrylic monomer having an aromatic group as described below is used, the refractive index difference when used is lowered, thereby further enhancing the transparency of the adhesive film.

The polyalkylene glycol-modified isocyanate curing agent may have a weight average molecular weight of 350 g / mol to 5000 g / mol, preferably 450 g / mol to 4000 g / mol. Within the above range, the curing effect of the (meth) acrylic copolymer and the warp inhibiting effect at high temperatures can be obtained.

The polyalkylene glycol-modified isocyanate curing agent may be included in an amount of 0.001 to 5 parts by weight, preferably 0.001 to 3 parts by weight, based on 100 parts by weight of the following (meth) acrylic copolymer. In an embodiment of the present invention, 0.05 to 3.0 parts by weight and 0.30 to 3.0 parts by weight of the (meth) acrylic copolymer may be included in 100 parts by weight of the following (meth) acrylic copolymer. In the above range, the pressure-sensitive adhesive composition may be crosslinked to give an adhesive effect, and transparency deterioration due to excessive use can be prevented, and a dent improving effect can be obtained.

(Meth) acrylic copolymer is a copolymer having a (meth) acrylic monomer having an alkyl group, (meth) acrylic monomer having a hydroxyl group, (meth) acrylic monomer having an aromatic group, (meth) acrylic monomer having a tertiary amine group Preferably a random copolymer of monomer mixtures comprising (meth) acrylic monomers.

(Meth) acrylic copolymer is a copolymer of a monomer mixture containing both a (meth) acrylic monomer having an aromatic group, a (meth) acrylic monomer having a tertiary amine group and a (meth) acrylic monomer having a heteroalicyclic group, When used in combination with an alkylene glycol-modified isocyanate curing agent, it can improve light damping and warping as well as dent improving effect.

The (meth) acrylic monomer having an alkyl group may include a (meth) acrylic acid ester having an unsubstituted C1 to C10 alkyl group. Specifically, the (meth) acrylic monomer having an alkyl group may be at least one selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n- butyl (meth) (meth) acrylate, isooctyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, But are not limited to, at least one of octyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate. These may be included singly or in combination of two or more.

The (meth) acrylic monomer having an alkyl group may be contained in the monomer mixture in an amount of 40 mol% to 95 mol%, specifically 45 mol% to 90 mol% and 55 mol% to 90 mol%. Within the above range, the mechanical strength of the pressure-sensitive adhesive film can be increased.

The (meth) acrylic monomer having a hydroxyl group is a (meth) acrylic monomer having a C1 to C20 alkyl group having at least one hydroxyl group, a (meth) acrylic monomer having a C3 to C20 cycloalkyl group having at least one hydroxyl group, (Meth) acryl-based monomers having C6 to C20 aromatic groups. Specifically, the (meth) acrylic monomer having a hydroxyl group is preferably a (meth) acrylic monomer having a C1 to C20 alkyl group having at least one hydroxyl group, and 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (Meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl Acrylate. ≪ / RTI > These may be included singly or in combination of two or more.

The (meth) acrylic monomer having a hydroxyl group may be contained in an amount of 0.1 mol% to 20 mol%, specifically 0.5 mol% to 10 mol% and 1 mol% to 7.5 mol% in the monomer mixture. Within the above range, the adhesive strength and durability of the adhesive film are improved, and peelability and cohesive force can be improved.

The (meth) acrylic monomer having an aromatic group may include an (meth) acrylic acid ester having an aryl group having 6 to 20 carbon atoms or an arylalkyl group having 7 to 20 carbon atoms. Specifically, the (meth) acrylic monomer having an aromatic group may include, but is not limited to, phenyl (meth) acrylate, benzyl (meth) acrylate and the like.

Preferably, the (meth) acrylic monomer having an aromatic group may have a glass transition temperature of the homopolymer of 0 占 폚 or lower, for example, 100 占 폚 or lower, preferably 5 占 폚 to 50 占 폚. Within this range, there may be dent, warp, and light leakage improving effects.

The (meth) acrylic monomer having an aromatic group may contain from 0.001 mol% to 20 mol%, specifically from 0.01 mol% to 20 mol%, of the monomer mixture. Within this range, there may be light leakage improvement or bending and dent improvement effects.

The (meth) acrylic monomer having a tertiary amine group may include a dialkylaminoalkyl (meth) acrylate ester. Specifically, the dialkylaminoalkyl (meth) acrylate is selected from the group consisting of dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, dimethylaminobutyl (meth) acrylate, diethylaminoethyl (Meth) acrylate, diethylaminopropyl (meth) acrylate, diethylaminobutyl (meth) acrylate, and dibutylaminoethyl (meth) acrylate.

The (meth) acrylic monomer having a tertiary amine group may include 0.001 to 15 mol%, specifically 0.01 to 10 mol%, of the monomer mixture. In the above range, the rate of aging at the room temperature of the pressure-sensitive adhesive composition for a polarizing plate or the dried product thereof may be increased, and the curing reaction rate may be increased.

(Meth) acrylic monomers having a hetero-alicyclic group may include (meth) acrylic acid esters having C4 to C9 hetero-alicyclic groups containing at least one of nitrogen, oxygen or sulfur. Specifically, the (meth) acrylic monomer having a heteroalicyclic group may include (meth) acryloylmorpholine, but is not limited thereto.

The (meth) acrylic monomer having a heteroalicyclic group may be contained in an amount of 1 mol% to 20 mol%, specifically 5 mol% to 15 mol% in the monomer mixture. Within this range, reliability may be improved.

The monomer mixture may further comprise a monomer having an alicyclic group.

The (meth) acrylic monomer having an alicyclic group is a (meth) acrylic acid ester having a monocyclic or heterocyclic alicyclic group having 5 to 20 carbon atoms, such as cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, Acrylate, dicyclopentenyl (meth) acrylate, fentanyl (meth) acrylate, methylcyclohexyl (meth) acrylate, and dicyclopentenyl (meth) acrylate. These may be included singly or in combination of two or more.

The (meth) acrylic monomer having an alicyclic group may be contained in an amount of from 1 mol% to 30 mol%, specifically from 5 mol% to 25 mol%, of the monomer mixture. Within the above range, the reliability of the adhesive film may be improved.

(Meth) acrylic copolymer can be a non-carboxylic acid (meth) acrylic copolymer because it does not contain a (meth) acrylic monomer having a carboxylic acid group in the monomer mixture. Therefore, there is an effect of suppressing metal corrosion upon adhesion of the touch screen panel. The (meth) acrylic copolymer may have an acid value of 5 mg KOH / g or less, more specifically 1 mg KOH / g or less. Within this range, it is possible to realize a corrosion inhibiting effect directly or indirectly on the adherend.

(Meth) acrylic copolymer may have a glass transition temperature of -35 캜 to -10 캜, preferably -35 캜 to -15 캜. In the above range, the dent can be lowered and the light leakage and warping can be suppressed.

The (meth) acrylic copolymer may have a weight average molecular weight of 500,000 to 1,500,000 g / mol, and preferably 500,000 to 1,200,000 g / mol. In the above range, the dent can be lowered and the light leakage and warping can be suppressed.

The (meth) acrylic copolymer may be prepared by polymerizing a monomer mixture by a conventional polymerization method. The polymerization method may include conventional methods known to those skilled in the art. For example, the (meth) acrylic copolymer can be prepared by adding an initiator to a monomer mixture, followed by conventional copolymerization, such as suspension polymerization, emulsion polymerization, solution polymerization and the like. The polymerization temperature may be 65 占 폚 to 70 占 폚, and the polymerization time may be 6 hours to 8 hours. The initiator may be an azo-based polymerization initiator; And / or peroxides such as benzoyl peroxide or acetyl peroxide, and the like.

The pressure-sensitive adhesive composition may further comprise a conventional curing agent other than the polyalkylene glycol-modified isocyanate curing agent. The pressure-sensitive adhesive composition may further comprise at least one of an isocyanate curing agent, an epoxy curing agent, an aziridine curing agent, a metal chelating curing agent, and an amine curing agent, which is not modified with a polyalkylene glycol, A curing agent.

Examples of the isocyanate curing agent which is not modified with polyalkylene glycol include toluene diisocyanate (TDI) including hexamethylene diisocyanate (HDI), 2,4-toluene diisocyanate, 2,6-toluene diisocyanate and the like, Xylene diisocyanate (XDI) including methylene diphenyl diisocyanate (MDI), 1,3-xylene diisocyanate, and 1,4-xylene diisocyanate, hydrogenated toluene diisocyanate, isophorone diisocyanate, 1,3- Tetramethylxylylene diisocyanate, 1,5-naphthalene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, trimethylolpropane / diisocyanate, Trimethylolpropane toluene diisocyanate adduct containing trimeric adduct of toluene diisocyanate, trimethylol propane trimethylol propane Xylene diisocyanate adduct, triphenylmethane triisocyanate, methylene bis triisocyanate, and the like.

The polyalkylene glycol modified isocyanate curing agent and other conventional curing agents may be included in an amount of 0.001 to 5 parts by weight, preferably 0.001 to 3 parts by weight, based on 100 parts by weight of the (meth) acrylic copolymer. In an embodiment of the present invention, 0.05 to 3.0 parts by weight. Within the above range, the pressure-sensitive adhesive composition is crosslinked to give an adhesive effect, and transparency can be prevented from being lowered due to excessive use.

The pressure-sensitive adhesive composition may include a solvent. The solvent improves the coating property of the pressure-sensitive adhesive composition and can prevent the self-curing reaction of the pressure-sensitive adhesive composition. The solvent may be any conventional solvent known to those skilled in the art. For example, the solvent may include one or more of methyl ethyl ketone, ethyl acetate, and toluene.

The pressure-sensitive adhesive composition may further include at least one of a silane coupling agent, a reworking agent, a curing catalyst, an antistatic agent, and a curing catalyst.

The silane coupling agent can realize an adhesive film having high adhesion to an adherend such as glass. The silane coupling agent may comprise conventional silane coupling agents known to those skilled in the art. For example, the silane coupling agent may have 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. ; And 3-chloropropyltrimethoxysilane, and the like, but are not limited thereto. The silane coupling agent may be included in an amount of 0.001 to 5 parts by weight, specifically 0.001 to 3 parts by weight, based on 100 parts by weight of the (meth) acrylic copolymer. Within the above range, endurance reliability is excellent, and changes in components and physical properties with time can be small.

The reworking agent may include a polysiloxane oligomer or a mixture containing it to improve the reworkability of the adhesive film. The reworking agent may be included in an amount of 0.001 to 5 parts by weight, specifically 0.005 to 1 part by weight based on 100 parts by weight of the (meth) acrylic copolymer. In the above range, it is possible to improve the workability without affecting the physical properties of the polarizing plate adhesive film.

The antistatic agent suppresses the generation of static electricity during rework of the pressure-sensitive adhesive film, and may include a conventional antistatic agent. The antistatic agent may be contained in an amount of 0.001 to 5 parts by weight, specifically 0.1 to 3 parts by weight based on 100 parts by weight of the (meth) acrylic copolymer. Within the above range, the antistatic function can be provided without affecting the physical properties of the polarizing plate adhesive film.

The curing catalyst is a boron-based compound, e.g., boron trifluoride (boron trifuloride) complexes, in particular boron trifluoride rate (etherate), boron trifluoride tetrahydrofuran complex in a (BF ₃ -THF), Boron trifluoride aniline complex (BF ₃ -Aniline), specifically BF ₃ O (CH ₃ ) ₂ (boron trifluoride dimethyl etherate), BF ₃ O (C ₂ H ₅ ) ₂ (boron trifluoride diethyl etherate); Phosphine-based compounds such as triphenylphosphine, tributylphosphine, tri (p-methylphenyl) phosphine, tri (nonylphenyl) phosphine, triphenylphosphine / triphenylborate, tetraphenylborate and the like; Secondary amine or tertiary amine compounds, for example alpha-tertiary amine compounds such as triethylamine, benzyldiethylamine or benzyldimethylamine (e.g. KH-30, Kukdo); Imidazole-based compounds such as 2-methylimidazole, 2-phenylimidazole, or 2-phenyl-4-methylimidazole; Sulfonic acid-based compounds such as para-toluenesulfonic acid, benzenedodecylsulfonic acid, naphthalenesulfonic acid, naphthalenedisulfonic acid, methanesulfonic acid, methane disulfonic acid, phenolsulfonic acid and the like. The curing catalyst may be contained in an amount of 0.01 to 5 parts by weight, specifically 0.05 to 2 parts by weight, based on 100 parts by weight of the (meth) acrylic copolymer. Within this range, there is an effect of shortening the curing rate.

The pressure-sensitive adhesive composition may further comprise conventional additives. The additive may include an ultraviolet absorber, an antioxidant, a tackifier resin, a plasticizer, and the like. The additive may be included in an amount of 0.001 to 5 parts by weight, specifically 0.01 to 1 part by weight based on 100 parts by weight of the (meth) acrylic copolymer. Within the above range, the additive effect can be obtained without affecting the physical properties of the polarizing plate adhesive film.

The pressure-sensitive adhesive composition may have a viscosity of 1,000 cPs to 4,000 cPs at 25 占 폚. 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, a pressure-sensitive adhesive film for a polarizing plate according to an embodiment of the present invention will be described.

The pressure sensitive adhesive film for a polarizing plate according to this embodiment can be formed from the pressure sensitive adhesive composition for a polarizing plate according to the embodiments of the present invention.

The adhesive film of this embodiment can have a creep of at least 200 탆, preferably 250 탆 to 800 탆 at 85 캜. In the above range, the creep is high at a high temperature, so that a soft adhesive film can suppress light leakage and improve adhesion and durability.

The adhesive film is optically transparent and can be used in an optical display device. Specifically, the adhesive film may have a light transmittance of 85% or more, more specifically 85% to 95% at a wavelength of 380 nm to 780 nm.

The thickness of the adhesive film may be 100 占 퐉 or less, specifically 5 占 퐉 to 50 占 퐉. In the above range, it can be used in an optical display device.

The adhesive film can be produced by coating the pressure-sensitive adhesive composition for a polarizing plate to a predetermined thickness, drying it, and then aging at a constant temperature and humidity of 25 ° C to 35 ° C and a relative humidity of 30% to 60%.

Hereinafter, a polarizing plate and an optical display device according to an embodiment of the present invention will be described.

The polarizing plate of the present invention may include a pressure-sensitive adhesive film for a polarizing plate according to embodiments of the present invention. The polarizing plate of the present invention can be manufactured by adhering a pressure sensitive adhesive film for a polarizing plate according to embodiments of the present invention to one side of a polarizing plate or by coating the pressure sensitive adhesive composition for a polarizing plate on a side of a polarizing plate to a predetermined thickness and then aging.

The optical display device of the present invention may include the pressure-sensitive adhesive film of the present invention or the polarizing plate of the present invention. The optical display device may include, but is not limited to, a liquid crystal display device and an organic light emitting display device. The optical display device of the present invention may also include a flexible device.

The polarizing plate may include a polarizer, an optical film formed on at least one side of the polarizer, and an adhesive film formed on at least one side of the optical film. The polarizer and the optical film are based on conventional contents known to those skilled in the art. The thickness of the polarizing plate may be 25 탆 to 100 탆, specifically 50 탆 to 85 탆. In the above range, it can be used in an optical display device. The polarizing plate may include a polarizer, an optical film formed on at least one side of the polarizer, and an adhesive film formed on the optical film. The optical film may be an optically transparent resin film, and may include a cellulose-based film including triacetyl cellulose and the like, a polyester film including a polyethylene terephthalate and the like, a polycarbonate film, an acrylic film, a cycloolefin polymer film and the like.

The liquid crystal display device is not particularly limited, but may include a liquid crystal display device including an IPS liquid crystal.

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.

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

(A) (Meth) acrylic copolymer: The (meth) acrylic copolymer

(B) Polyalkylene glycol-modified isocyanate curing agent: The curing agent

(b) Isocyanate Curing Agent Not Modified with Polyalkylene Glycol: A xylene diisocyanate adduct of trimethylolpropane (TD-75, Soken)

(C) Curing catalyst: S promoter (Soken)

(D) Silane coupling agent: A-50 (Soken)

(E) Antistatic agent: FC-4400 (3M, USA)

(F) Reactive agent: MAC-2101 (Soken)

Manufacturing example 1: (meth) acrylic  Preparation of Copolymer

Ethyl acetate was added to a 1 L reactor equipped with a cooling device to reflux nitrogen gas and facilitate temperature control. (meth) acrylate (MA), 15 mol% of benzyl acrylate (BzA), 10 mol% of acryloylmorpholine (ACMO), 4 mol% of 4-hydroxybutyl acrylate -HBA) and 0.05 mol% of dimethylaminoethyl acrylate (DMAEA) were added to the reactor. Then, a mixture of ethyl acetate and methyl ethyl ketone was added to the reactor. In order to remove oxygen from the monomer mixture, nitrogen gas was introduced for 30 minutes to replace the reactor, and the internal temperature of the reactor was maintained at 65 ° C. After the monomer mixture was uniformly stirred, 0.06 part by weight of dimethyl 2,2'-azobis (2-methylpropiotate) was added as an initiator and reacted for 4 hours as an initiator. The internal temperature of the reactor was raised to 65 ° C, Followed by further reaction at 70 DEG C for 2 hours, followed by cooling and addition of methyl ethyl ketone to prepare a 25 wt% (meth) acrylic copolymer solution.

Manufacturing example  2 to Manufacturing example 6: (meth) acrylic  Preparation of Copolymer

(Meth) acrylic copolymer was prepared in the same manner as in Production Example 1, except that the kinds and contents of monomers in the monomer mixture were changed as shown in Table 1 below.

BA MA BzA ACMO 4-HBA DMAEA CHA IBXA AA Mw Tg Production Example 1
(A1) 66.95 5 15 10 3 0.05 - - - 820,
300 -20.0 Production Example 2
(A2) 66.95 15 5 10 3 0.05 - - - 841,250 -20.5 Production Example 3
(A3) 69.95 - 7 10 3 0.05 10 - - 864,100 -19.8 Production Example 4
(A4) 71.95 - 10 10 3 0.05 - 5 - 866,700 -20.4 Production Example 5
(A5) 99 - - - One - - - - 1,600,000 -46 Production Example 6
(A6) 72 25 - - One - - - 2 1,000,000 -30

In Table 1, BA: n-butyl acrylate, MA: methyl acrylate, BzA: benzyl acrylate, ACMO: acryloylmorpholine, 4-HBA: 4-hydroxybutyl acrylate, DMAEA: dimethylaminoethyl Acrylate, CHA: cyclohexyl acrylate, IBXA: isobornyl acrylate, AA: acrylic acid, Mw: weight average molecular weight (Mw, unit: g / mol) of the prepared acrylic copolymer, Tg: Of glass transition temperature (unit: ° C).

Manufacturing example  7: Polyalkylene glycol  Preparation of Modified Isocyanate Curing Agent

Polypropylene glycol (PPG) having a number average molecular weight (Mn) of 400 and xylene diisocyanate (XDI, weight average molecular weight: 188 g / mol, TCI Chemicals) were introduced into a round bottom flask so that the molar ratio of PPG: XDI became 1: 2. The obtained mixture was heated to 60 DEG C or lower and DBTDL as a reaction catalyst was added slowly to 0.2 wt% per 1 mol of xylene diisocyanate to prepare a reaction mixture. After the reaction mixture was reacted at 70 ° C. for 2 hours, the disappearance of the isocyanate group in the reaction mixture was confirmed and the completion of the reaction was confirmed. When the content of unreacted xylene diisocyanate was 1 wt% or less, the reaction was terminated to prepare the polyalkylene glycol-modified isocyanate curing agent.

Manufacturing example  8 - Manufacturing example  14: Polyalkylene glycol  Preparation of Modified Isocyanate Curing Agent

(PPG) having a number average molecular weight (Mn) of 400 was used instead of the polypropylene glycol shown in Table 2 in Production Example 7 and 4,4'-methylene bis (phenyl isocyanate) ( MDI, weight average molecular weight: 250.25 g / mol, manufactured by TCI Chemicals), the molar ratio of PPG: MDI was 1: 2, and the DBTDL content was changed. To prepare a curing agent.

Polyalkylene glycol Isocyanate curing agent DBTDL Production Example 7
(B1) PPG-400 XDI 0.753 Production Example 8
(B2) PPG-1000 XDI 0.753 Production Example 9
(B3) PPG-2000 XDI 0.753 Production Example 10
(B4) PPG-3000 XDI 0.753 Production Example 11
(B5) PPG-400 MDI 1.001 Production Example 12
(B6) PPG-1000 MDI 1.001 Production Example 13
(B7) PPG-2000 MDI 1.001 Production Example 14
(B8) PPG-3000 MDI 1.001

PPG-400: Polypropylene glycol (PPG-1000D, Kumho Petrochemicals) having a number average molecular weight of 1000, PPG-1000 having a number average molecular weight of 400, -2000: Polypropylene glycol (PPG-2000D, Kumho Petrochemicals) having a number average molecular weight of 2000, PPG-3000: Polypropylene glycol having a number average molecular weight of 3,000 (PPG-3000D, Kumho Petrochemicals).

Example  One

(B1) 0.072 parts by weight of a polyalkylene glycol-modified isocyanate curing agent were mixed with 17 parts by weight of the (A1) (meth) acrylic copolymer. (C) a curing catalyst (S promoter, Soken), (D) a silane coupling agent (C), and (C) 0.01 parts by weight of a curing catalyst, 0.05 parts by weight of a silane coupling agent, 0.375 parts by weight of an antistatic agent, A-50, Soken), (E) an antistatic agent (FC-4400, 3M, USA) and (F) a reworking agent (MAC- 2101, Soken) were mixed and methyl ethyl ketone To obtain a pressure-sensitive adhesive composition for a polarizing plate. The above content is based on the solid content excluding the solvent and the like.

Example  2 to Example  18

Except that the kind and / or the content of the (meth) acrylic copolymer and the kind and / or the content of the curing agent were changed as in the following Table 3 (unit: parts by weight) in Example 1, A composition was prepared.

Comparative Example  1 to Comparative Example  3

A pressure-sensitive adhesive composition for a polarizing plate was prepared in the same manner as in Example 1, except that the kind and / or the content of the (meth) acrylic copolymer, the kind and / or the content of the curing agent were changed as shown in Table 3 below.

The compositions of the pressure-sensitive adhesive compositions of Examples and Comparative Examples are shown in Table 3 below.

(A) (B) Kinds content
(Parts by weight) Kinds content
(Parts by weight) Kinds content
(Parts by weight) Example 1 (A1) 17 (B1) 0.072 - - Example 2 (A1) 17 (B2) 0.127 - - Example 3 (A1) 17 (B3) 0.219 - - Example 4 (A1) 17 (B4) 0.312 - - Example 5 (A1) 17 (B5) 0.083 - - Example 6 (A1) 17 (B6) 0.139 - - Example 7 (A1) 17 (B7) 0.231 - - Example 8 (A1) 17 (B8) 0.323 - - Example 9 (A2) 17 (B1) 0.072 - - Example 10 (A2) 17 (B2) 0.127 - Example 11 (A2) 17 (B3) 0.219 - - Example 12 (A2) 17 (B4) 0.312 - - Example 13 (A2) 17 (B5) 0.083 - - Example 14 (A2) 17 (B6) 0.139 - - Example 15 (A2) 17 (B7) 0.231 - - Example 16 (A2) 17 (B8) 0.323 - - Example 17 (A3) 17 (B1) 0.01 (b) 0.02 Example 18 (A4) 17 (B1) 0.025 - - Comparative Example 1 (A1) 17 - - (b) 0.072 Comparative Example 2 (A5) 17 (B1) 0.072 - - Comparative Example 3 (A6) 17 (B1) 0.072 - -

The properties of the pressure-sensitive adhesive composition for a polarizing plate of Examples and Comparative Examples were evaluated in Table 4 below.

(1) Durability: The polyvinyl alcohol film was stretched three times at 60 DEG C, adsorbed iodine, and then stretched 2.5 times in an aqueous boric acid solution at 40 DEG C to prepare a polarizer (thickness: 23 mu m). A triacetyl cellulose film (thickness: 80 占 퐉) was adhered to one surface of the prepared polarizer, and a triacetyl cellulose film (thickness: 42 占 퐉) was adhered to the other surface of the polarizer to produce a polarizing plate. The pressure-sensitive adhesive compositions of Examples and Comparative Examples were coated on a release film and dried at 90 占 폚 for 4 minutes to remove the solvent and peeled from the release film to prepare a pressure-sensitive adhesive sheet. The pressure-sensitive adhesive sheet thus prepared was adhered to one surface of a triacetyl cellulose film (thickness: 42 탆) of the polarizing plate prepared above and aged for 24 hours at constant temperature and humidity of 23 캜 and 55% relative humidity to prepare a polarizing plate including an adhesive film Respectively.

The prepared polarizing plate was cut into a rectangle having a size of width x length (100 mm x 80 mm) (MD direction of polarizer x TD direction of polarizer of polarizer). Then, the cut polarizing plate was adhered to a non-alkali glass plate (width x length, 110 mm x 90 mm) through the adhesive sheet to prepare a test piece for durability evaluation. The specimen was subjected to autoclave treatment at 50 DEG C for 1000 seconds to prepare a specimen having a polarizing plate for durability evaluation laminated on a glass plate. The obtained specimen was allowed to stand at 85 DEG C for 500 hours, or the specimen was allowed to stand at 60 DEG C and 95% relative humidity for 500 hours and evaluated according to the following criteria.

○: No lift, drag, and bubble formation

Δ: At least one of lifting, dragging, and bubble generation occurs finely and the bubble size is less than 100 μm.

X: There is a lot of lifting, attracting and bubbling, and bubble size is over 100㎛.

(2) Warpage: The pressure-sensitive adhesive compositions of Examples and Comparative Examples were coated on a polyethylene terephthalate release film and dried at 90 DEG C for 4 minutes. The obtained adhesive film had a thickness of 25 mu m. A polarizing plate having a triacetyl cellulose film adhered to both sides of a polarizer was prepared in the same manner as in the above (1), and the above-prepared pressure sensitive adhesive film was laminated on one side of a triacetyl cellulose film (thickness: 42 탆) And aged at a relative humidity of 55% for 24 hours. The polarizing plate having the adhesive film was cut into a rectangular size having a length x width (210 mm x 25 mm, MD direction of the polarizer x direction of the polarizer of the polarizer), and then a non-alkali glass plate of length x width x thickness (210 mm x 25 mm x 0.5 mm) Was adhered via the above adhesive film and subjected to autoclave treatment at 50 DEG C for 1000 seconds to prepare specimens for bending measurement.

The obtained specimens were left in an oven at 85 ° C for 72 hours, and then the specimens were taken out of the oven and kept at room temperature for 2 hours. Then, the specimen was placed on a flat plane, one of the widths of the specimen was fixed to the plane, and the distance between the other end of the specimen and the plane was measured. The average value was recorded as a bending value after 5 measurements. And evaluated by the following criteria.

B: Less than 15 mm of warpage

B: Bending value is 15 mm or more and 17 mm or less

X: Deflection exceeds 17mm

(3) Dent: The pressure-sensitive adhesive composition of Examples and Comparative Examples was coated on a polyethylene terephthalate release film (thickness: 38 mu m) and dried at 90 DEG C for 4 minutes to produce a pressure-sensitive adhesive film having a thickness of 25 mu m. A polarizing plate having a triacetyl cellulose film adhered to both sides of a polarizer was prepared in the same manner as in the above (1), and the above-prepared pressure sensitive adhesive film was laminated on one side of a triacetyl cellulose film (thickness: 42 탆) And aged at a relative humidity of 55% for 24 hours. The polarizing plate having the adhesive film was cut into a length x width (50 mm x 10 mm). The cut polarizing plate was placed on a soda lime glass plate (thickness: 1 mm) with the release film facing up, and fixed with a tape to prepare a specimen.

The dent was measured at 25 ° C using a TA Instrument (TEXTURE ANALYZER TA.XT PLUS, 5 kg load cell, EKO Instruments). A spherical stainless steel tip (diameter 1 mm) of TA Instrument was placed 1 mm high on the release film of the specimen. After pressing the release film for 15 seconds with the spherical stainless tip at a load of 50 gf, the spherical stainless tip was removed from the release film and left for the time shown in Table 4 below. Then, the release film was removed and the pressing trace formed on the adhesive film was observed with a 3D optical profiler to record the maximum depth of the pressing trace. The dent was evaluated according to the following criteria.

X: Maximum depth exceeds 15μm

DELTA: maximum depth is not less than 9 mu m and not more than 15 mu m

?: Maximum depth exceeding 5 占 퐉 and less than 9 占 퐉

⊚: Maximum depth is less than 5 탆.

(4) Creep (unit: 占 퐉): The creep was measured on the adhesive film using TEXTURE ANALYZER TA.XT PLUS (5 kg of load cell, EKO Instruments) with reference to FIG. The pressure-sensitive adhesive compositions of Examples and Comparative Examples were coated on a polyethylene terephthalate release film and dried at 90 DEG C for 4 minutes. A polarizing plate 22 having a triacetyl cellulose film adhered to both sides of a polarizer was prepared in the same manner as in the above (1), and the pressure-sensitive adhesive sheet prepared above was laminated on one side of a triacetyl cellulose film (thickness: 42 탆) The sample 23 was aged at 23 캜 and 55% relative humidity for 24 hours to obtain an adhesive film 21 (thickness: 25 탆) adhered to one side of the polarizing plate 22. And cut into a length x width (100 mm x 15 mm, TD direction of the polarizer and x direction of the polarizer of the polarizer). 1, the MD direction of the polarizer and one side of the glass plate 20 are perpendicular to each other, and the adhesive area of the adhesive film axb between the adhesive film and the glass plate is 15 mm x 15 mm, Autoclaved at 50 DEG C for 1000 seconds and left at room temperature for 24 hours. And the creep measurement specimen 23 was measured from the sodalime glass plate 20 when the specimen 23 for creep measurement was pulled for 1000 seconds under the load W. FIG. The creep measurement temperature was 85 캜, and the load W was 1500 g when the creep was measured.

(5) Light leakage: A polarizing plate including an adhesive film was prepared in the same manner as in (1) above. The prepared polarizing plate was cut into a polarizer for a top plate having a size of 150 mm x 90 mm in the MD direction x TD of the polarizer and a polarizing plate for a bottom plate having a size of 90 mm x 150 mm in the MD direction x MD direction of the polarizer. The above-prepared polarizer for the upper plate was adhered to the upper surface of a non-alkali glass plate having a length x width of 160 mm x 100 mm, and the polarizer for the lower plate was adhered to the lower surface of the alkali-free glass plate. At this time, the MD direction of the polarizer for the upper plate and the MD direction of the polarizer for the lower plate were made perpendicular to each other. The specimens were autoclaved at 50 캜 for 1000 seconds and the light leakage was measured. The prepared specimens were allowed to stand in an oven at 85 DEG C for 500 hours, removed from the oven, and left at room temperature for 2 hours. Then, the light leakage was measured. After driving the liquid crystal display for the PLS mode, the luminance of the entire display panel was measured at a height of 1 m by using a luminance measuring device (RISA, Hiland). Specifically, the luminance (c) at the center of the panel and the luminance (a), (b), (d), and (e) of the corner where the light leakage appears are measured. As shown in FIG. 2, the luminance measurement point was set such that the measurement radius in the vicinity of each vertex of the panel was 0.5 cm. In Fig. 2, a, b, c, d, e indicate luminance measurement points. The degree of light leakage (L) was quantified according to the following formula (1). The lower the ΔL, the better the light leakage. And evaluated according to the following evaluation criteria.

<Formula 1>

? L = | [(a + b + d + e) / 4] / c - 1 |

(A, b, d, and e in Equation 1 are the luminance measured at the luminance measurement points a, b, d, e (high luminance area)

c (low luminance area) is the luminance of the luminance measurement point c of FIG. 2)

○ - Non-light leakage with ΔL greater than or equal to 0 and less than or equal to 0.1,

Δ - ΔL is less than 0.3 but less than 0.3.

× - Excessive light leakage with ΔL of 0.3 or more.

durability warp Dent Creep Light beam 500 hours at 85 ° C 500 hours at 60 &lt; 0 &gt; C and 95% relative humidity 85 ° C /
After 72 hrs For 5 minutes For 2 hours For 20 hours 85 ℃ 85 ° C /
500 hrs Example 1 ○ ○ ○ ○ ◎ ◎ 257 ○ Example 2 ○ ○ ○ ○ ◎ ◎ 288 ○ Example 3 ○ ○ ○ ○ ○ ◎ 310 ○ Example 4 ○ ○ ○ ○ ○ ○ 375 ○ Example 5 ○ ○ ○ ○ ○ ◎ 244 ○ Example 6 ○ ○ ○ ○ ○ ◎ 268 ○ Example 7 ○ ○ ○ ○ ○ ○ 328 ○ Example 8 ○ ○ ○ ○ ○ ○ 388 ○ Example 9 ○ ○ ○ ○ ◎ ◎ 298 ○ Example 10 ○ ○ ○ ○ ○ ◎ 314 ○ Example 11 ○ ○ ○ ○ ○ ○ 328 ○ Example 12 ○ ○ ○ ○ ○ ○ 395 ○ Example 13 ○ ○ ○ ○ ◎ ◎ 301 ○ Example 14 ○ ○ ○ ○ ◎ ◎ 355 ○ Example 15 ○ ○ ○ ○ ○ ○ 389 ○ Example 16 ○ ○ ○ ○ ○ ◎ 405 ○ Example 17 ○ ○ ○ ○ ○ ○ 264 ○ Example 18 ○ ○ ○ ○ ○ ○ 281 ○ Comparative Example 1 ○ △ X X X △ 157 X Comparative Example 2 X X △ X X X 865 △ Comparative Example 3 X X △ X X X 729 △

As shown in Table 4, the pressure-sensitive adhesive composition for a polarizing plate of the present invention suppresses light leakage and deflection and has a low dent value, thereby suppressing the pressing of the pressure-sensitive adhesive film by solid particles during processing, cutting, packaging and storage of the pressure-sensitive adhesive film and / It is possible to realize an adhesive film capable of restoring the pressing formed by the particles at a high speed.

On the other hand, Comparative Example 1 containing no curing agent of the present invention failed to obtain the effect of the present invention in warpage and dent. Comparative Example 2 and Comparative Example 3 which did not contain the copolymer of the present invention had poor durability and could not obtain the effect of the present invention in warpage and dent.

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 (12)

(Meth) acrylic monomers having an alkyl group, (meth) acrylic monomers having a hydroxyl group, (meth) acrylic monomers having an aromatic group, (meth) acrylic monomers having a tertiary amine group and (meth) acrylic monomers having a heterocyclic group (Meth) acrylic copolymer of the monomer mixture; And a polyalkylene glycol-modified isocyanate curing agent.
The pressure-sensitive adhesive composition for a polarizing plate according to claim 1, wherein the (meth) acrylic copolymer has a glass transition temperature of -35 ° C to -10 ° C and a weight average molecular weight of 500,000 to 1.5 million g / mol.
The pressure-sensitive adhesive composition for a polarizing plate according to claim 1, wherein the (meth) acrylic monomer having an aromatic group comprises a (meth) acrylic acid ester having an arylalkyl group having 7 to 20 carbon atoms.
The composition according to claim 1, wherein the monomer mixture comprises 40 mol% to 95 mol% of the (meth) acrylic monomer having the alkyl group, 0.1 mol% to 20 mol% of the (meth) acrylic monomer having the hydroxyl group, (Meth) acrylic monomer having a tertiary amine group, and from 1 mol% to 20 mol% of a (meth) acrylic monomer having the hetero-alicyclic group, in an amount of from 0.001 mol% to 20 mol% Composition.
The pressure-sensitive adhesive composition for a polarizing plate according to claim 1, wherein the monomer mixture further comprises a (meth) acrylic monomer having an alicyclic group.
The pressure-sensitive adhesive composition for a polarizing plate according to claim 1, wherein the polyalkylene glycol has at least one of polypropylene glycol and polyethylene glycol having a number average molecular weight of 300 g / mol to 5,000 g / mol.
The pressure-sensitive adhesive composition for a polarizing plate according to claim 1, wherein the isocyanate curing agent comprises an isocyanate curing agent having an aromatic group.
The pressure-sensitive adhesive composition for a polarizing plate according to claim 1, wherein the pressure-sensitive adhesive composition further comprises at least one of an isocyanate curing agent, an epoxy curing agent, an aziridine curing agent, a metal chelating curing agent and an amine curing agent which is not modified with a polyalkylene glycol.
The pressure-sensitive adhesive composition for a polarizing plate according to claim 1, wherein the pressure-sensitive adhesive film formed from the pressure-sensitive adhesive composition has a creep of 200 μm or more at 85 ° C.
A pressure-sensitive adhesive film for a polarizing plate formed from the pressure-sensitive adhesive composition for a polarizing plate according to any one of claims 1 to 9.
A polarizing plate comprising the pressure-sensitive adhesive film for a polarizing plate formed of the pressure-sensitive adhesive composition for a polarizing plate according to any one of claims 1 to 9.
An optical display device comprising the polarizing plate of claim 11.

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