KR20100078564A - Ultra thin polarizing plate and liquid crystal display device comprising the same - Google Patents

Abstract

PURPOSE: An ultra-thin polarizing plate and a liquid crystal display including the same are provided to easily separate the polarizing plate from a liquid crystal cell without damage to a liquid crystal substrate. CONSTITUTION: An ultra-thin polarizing plate(20) comprises a transparent protective film(21), a polarizer(22), a first adhesive layer(23-1), a second adhesive layer(23-2), and a release film(24). The transparent protective film, the polarizer, the first adhesive layer, the second adhesive layer, and the release film are laminated in order. The storage modulus of the second adhesive layer is bigger than the first adhesive layer.

Description

Thin film type polarizer and liquid crystal display device equipped with it {ULTRA THIN POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE COMPRISING THE SAME}

The present invention relates to a thin film type polarizing plate having improved generation problems, durability, light leakage, and reworkability of bonding bubbles during bonding of a polarizer and an adhesive layer, and a liquid crystal display device having the thin film type polarizing plate.

Liquid crystal display devices (LCDs) are used in various applications such as notebooks, mobile phones, liquid crystal TVs, etc., and generally include liquid crystal cells and polarizing plates containing liquid crystals, and as adhesive layers or adhesive layers for bonding them. It is composed.

In addition, a polarizing plate constituting a liquid crystal display device generally has a polarizer having a thickness of about 30 μm in which an iodine-based compound or a dichroic polarizing material is adsorbed on a polyvinyl alcohol (PVA) resin film that is stretched in a predetermined direction. Or “polarizing film”), and on both sides of the polarizer, first and second transparent protective films having a thickness of about 80 μm represented by triacetyl cellulose (TAC) are laminated through an adhesive, respectively. Moreover, on the 1st or 2nd transparent protective film, it has a multilayered structure in which the pressure-sensitive adhesive layer joined with a liquid crystal cell is laminated | stacked.

On the other hand, in recent years, the market for slim liquid crystal display devices such as slim large wall-mounted TVs, mobile-type computers, vehicle TVs, displays of vehicle navigation systems, mobile phones, and the like, is rapidly expanding. Accordingly, in order to thin the entire module of the liquid crystal display, an ultra thin polarizing plate (UTP) is required.

As a method for manufacturing a thin film type polarizing plate, a method of thinly controlling the thickness of the polarizer or the transparent protective film and omitting the transparent protective film laminated on one side of the polarizer instead of the transparent protective film laminated on both sides of the polarizer The pressure-sensitive adhesive layer or the pressure-sensitive adhesive layer is directly laminated on the polarizer, and as shown in FIG. 1, the polarizing plate 10 having the transparent protective film 11, the polarizer 12, the pressure-sensitive adhesive layer 13, and the release film 14 in this order is provided. Has been proposed. However, these methods increase the shrinkage of the polarizer under high temperature or humidity conditions, thereby maximizing the light leakage phenomenon.

In order to solve this problem, Korean Laid-Open Patent Publication No. 2007-0034601 (published on Feb. 28,200) discloses that a deformation property at high temperature is increased by laminating an adhesive layer having a storage modulus of 1.0 × 10 ⁵ Pa or less at 23 ° C. on one surface of a polarizer. The polarizing plate is disclosed. In this document, the pressure-sensitive adhesive layer is provided with a cohesive force with flexibility or flexibility to alleviate the stress caused by the dimensional change due to shrinkage or expansion of the polarizer to improve the light leakage phenomenon. However, the storage elastic modulus of the pressure-sensitive adhesive layer is low, rather a problem that the shrinkage of the polarizer further increases.

Korean Laid-Open Patent Publication No. 2006-0086853 (published on May 1, 2006) discloses a polarizing plate having a pressure-sensitive adhesive layer having a storage modulus of 1.0 × 10 ⁶ Pa or more at 23 ° C. on one side of a polarizing plate. In this document, rather than relieving the stress caused by the shrinkage of the polarizing plate, it is intended to suppress the shrinkage of the polarizing plate in response to the generated stress. However, the storage elastic modulus of the pressure-sensitive adhesive layer is high, a bonding bubble is generated at the time of bonding with the polarizer, thereby causing a problem of deterioration of durability.

The present invention simultaneously solves the problem of light leakage due to the low storage modulus of the pressure-sensitive adhesive layer and the problem of generation of bonded bubbles and deterioration of durability due to the high storage modulus of the pressure-sensitive adhesive layer, without damaging the liquid crystal substrate. An object of the present invention is to provide a thin film type polarizing plate having improved reworkability so that the polarizing plate can be easily peeled off.

Another object of the present invention is to provide a liquid crystal display device having the thin film polarizing plate.

In order to achieve the above object, the present invention is a thin film type polarizing plate in which a transparent protective film, a polarizer, a first adhesive layer, a second adhesive layer and a release film are sequentially stacked, the storage modulus of the second adhesive layer (G ₂ ') Provided is a thin film polarizing plate which is larger than the storage modulus (G ₁ ′) of the first adhesive layer.

In addition, the present invention provides a liquid crystal display device having the thin film polarizing plate on at least one side of the liquid crystal cell.

According to the present invention, the first and second pressure-sensitive adhesive layers are provided on one side of the polarizer in order, and the bonding modulus of the conventional polarizer and the pressure-sensitive adhesive layer is adjusted by adjusting the storage modulus (G ′) of the first and second pressure-sensitive adhesive layers within a specific range. It not only suppresses the occurrence of bonding bubbles and improves durability, but also prevents light leakage, which causes deterioration of the image quality of the liquid crystal display device, and improves the rework property, thereby preventing the polarizing plate from the liquid crystal cell without damaging the liquid crystal substrate. It can peel easily.

The present invention relates to a thin film type polarizing plate having improved generation problems, durability, light leakage and reworkability of bonding bubbles during bonding of a polarizer and an adhesive layer, and a liquid crystal display device having the thin film type polarizing plate.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

As shown in FIG. 2, the thin film polarizing plate 20 of the present invention has a transparent protective film 21, a polarizer 22, a first adhesive layer 23-1, a second adhesive layer 23-2, and a mold release agent. The thin film type polarizing plate in which the films 24 are stacked in this order is characterized in that the storage modulus (G ₂ ′) of the second adhesive layer is larger than the storage modulus (G ₁ ′) of the first adhesive layer.

The transparent protective film 21 is preferably excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, and the like, and for example, polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, polybutylene terephthalate, and the like. Ester film; Cellulose films such as diacetyl cellulose and triacetyl cellulose; Polycarbonate film; Acrylic films such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene films such as polystyrene and acrylonitrile-styrene copolymers; Polyolefin-based films such as polyethylene, polypropylene, cyclo-based or norbornene-structured polyolefin and ethylene propylene copolymer; Vinyl chloride film; Amide films such as nylon and aromatic polyamides; Imide film; Polyether sulfone-based film; Sulfone film; Polyethyl ketone film; Vinyl alcohol film; Polyoxymethylene film; Ordinary films, such as an epoxy film, etc. can be used individually or in mixture of 2 or more types. Or all normal films, such as these blends, can be used. In addition, the transparent protective film may be a cured layer formed from a thermosetting or ultraviolet curing resin, such as acrylic, urethane, acrylic-urethane, epoxy, silicone. Among these, in consideration of polarization characteristics or durability, cellulose films such as triacetyl cellulose are preferred.

In general, the thickness of the transparent protective film is preferably 1 to 200 μm, preferably 5 to 100 μm in consideration of workability such as strength, handleability, thin film property, and the like.

Functional surface treatment layers, such as a hard coating layer, an antireflection layer, a diffusion or anti-clear coating layer, an antiglare layer, an antistatic layer, and the like may be further laminated on the surface unless the polarizer of the transparent protective film is bonded to the polarizer.

The polarizer 22 is an optical film which serves to change incident natural light into a desired single polarization state (linear flat state), and a dichroic dye is adsorbed and oriented on a film made of polyvinyl alcohol-based resin.

Polyvinyl alcohol-type resin which comprises the said polarizer can be manufactured by saponifying polyvinyl acetate type resin. Examples of the polyvinyl acetate-based resin include copolymers with other monomers copolymerizable with vinyl acetate, in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate. Specific examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, unsaturated sulfonic acids, olefins, vinyl ethers, acrylamides having an ammonium group, and the like. The degree of saponification of the polyvinyl alcohol-based resin may be about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified. For example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. In addition, the degree of polymerization of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000.

The polarizer is usually a uniaxially stretched polyvinyl alcohol-based film as described above, a process of dyeing the stretched polyvinyl alcohol-based film with a dichroic dye to adsorb, and a polyvinyl alcohol-based film adsorbed with a dichroic dye to an aqueous solution of boric acid. It can manufacture through a process to process and a process to wash with water. At this time, iodine or a dichroic organic dye can be used as a dichroic dye.

The pressure-sensitive adhesive layer is composed of two pressure-sensitive adhesive layers of the first pressure-sensitive adhesive layer 23-1 and the second pressure-sensitive adhesive layer 23-2 instead of one pressure-sensitive adhesive layer laminated on a conventional thin film polarizing plate, and the storage modulus of each pressure-sensitive adhesive layer (G ₁ ′, G ₂ ′) and the difference between the storage modulus (G ₁ ′-G ₂ ′) are adjusted pressure-sensitive adhesive layers. That is, the storage elastic modulus of the first adhesive layer to be bonded to the polarizer and the second adhesive layer to be bonded to the liquid crystal cell are differently adjusted, and the buffering action reduces the generation and durability of bonding bubbles during bonding to the polarizer. And it can solve the light leakage phenomenon and the rework problem at the same time when bonding with the liquid crystal cell.

In particular, in the present invention, in order to control the storage modulus (G ′) of the first adhesive layer 23-1 and the second adhesive layer 23-2, the pressure-sensitive adhesive composition used for each pressure-sensitive adhesive layer was adjusted. Specifically, the low adhesive modulus (G ′) is used for the first adhesive layer 23-1 by using a low molecular weight copolymer as a copolymer containing a crosslinkable functional group or by using a high molecular weight copolymer and a low molecular weight copolymer in combination. A pressure-sensitive adhesive composition having a high glass transition temperature (Tg), such as an ultraviolet curable compound, fine particles, or a cellulose resin, is added to the second adhesive layer 23-2 to the second adhesive layer 23-2. The adhesive composition which shows elasticity modulus (G ') was applied.

The adhesive composition for forming the 1st adhesive layer 23-1 and the 2nd adhesive layer 23-2 contains the copolymer containing a crosslinkable functional group, a crosslinking agent, and a silane coupling agent.

The copolymer including a crosslinkable functional group may be an acrylic resin, a silicone resin, a rubber resin, a urethane resin, a polyester resin, an epoxy copolymer, or the like, and preferably an acrylic copolymer.

The acrylic copolymer may be a copolymer of a monomer including a (meth) acrylic acid ester monomer for preparing a homopolymer having a glass transition temperature of −90 to 10 ° C. and a crosslinkable functional group. Here, "(meth) acryl" means both "methacryl" and "acrylic".

Specific examples of the (meth) acrylic acid ester monomer for preparing a homopolymer include n-octyl acrylate, 2-ethylhexyl acrylate, 2-ethyl butyl acrylate, hexyl acrylate, heptyl acrylate, nonyl acrylate, pentyl acrylate, Isooctyl acrylate, n-decyl methacrylate, n-dodecyl methacrylate, n-butyl acrylate, isobutyl acrylate, propyl acrylate, ethyl acrylate, methyl acrylate, 3-methylbutyl acrylate, n-hexyl methacrylate, n-octyl methacrylate, n-tetradecyl methacrylate, etc. are mentioned, These can be used individually or in combination of 2 or more types. In addition, the (meth) acrylic acid ester monomer for producing a homopolymer preferably has a glass transition temperature of -90 to 10 ° C, more preferably -80 to -10 ° C.

The (meth) acrylic acid ester monomer for preparing the homopolymer is preferably included in an amount of 85 to 99.9% by weight, and more preferably 90 to 95% by weight, based on the total monomer content (100% by weight) used to prepare the acrylic copolymer. It is to be included. If the content is less than 85% by weight, the initial adhesive strength and the stress relaxation action may be weak, and when the content exceeds 99.9% by weight, the adhesive durability may deteriorate.

The monomer containing a crosslinkable functional group is a monomer for imparting cohesive force or adhesive strength by chemical bonding so as not to cause cohesive failure of the adhesive under high temperature and humidity conditions by reacting with a crosslinking agent, for example, containing sulfonic acid group-containing monomer and phosphoric acid group. Monomer, cyano group-containing monomer, vinyl esters, aromatic vinyl compound, carboxyl group-containing monomer, acid anhydride group-containing monomer, hydroxy group-containing monomer, amide group-containing monomer, amino group-containing monomer, imide group-containing monomer, epoxy group-containing monomer and ether group-containing A monomer etc. can be used and these can be used individually or in combination of 2 or more types.

Examples of the sulfonic acid group-containing monomer include styrenesulfonic acid, allylsulfonic acid, 2- (meth) acrylic amido-2-methylpropanesulfonic acid, (meth) acrylamidopropanesulfonic acid, sulfopropyl (meth) acrylate, and (meth). Acryloyloxy naphthalene sulfonic acid, sodium vinyl sulfonate, etc. are mentioned.

2-hydroxyethyl acryloyl phosphate is mentioned as said phosphoric acid group containing monomer.

(Meth) acrylonitrile is mentioned as said cyano group containing monomer.

Examples of the vinyl esters include vinyl acetate, vinyl propionate and vinyl laurate.

Examples of the aromatic vinyl compound include styrene, chlorostyrene, chloromethylstyrene, α-methylstyrene, and other substituted styrenes.

Examples of the carboxyl group-containing monomers include (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid and isocrotonic acid.

As said acid anhydride containing monomer, maleic anhydride, itaconic anhydride, these acid anhydrides, etc. are mentioned.

As the hydroxy group-containing monomer, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, (4-hydroxymethylcyclohexyl) methylacrylate, N-methyl All (meth) acrylamide, vinyl alcohol, allyl alcohol, 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, etc. are mentioned.

Examples of the amide group-containing monomer include (meth) acrylamide, diethylacrylamide, N-vinylpyrrolidone, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N, N'-methylenebisacrylamide, N, N- dimethylaminopropyl (meth) acrylamide, diacetone acrylamide, etc. are mentioned.

Examples of the amino group-containing monomers include aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, and (meth) acryloyl morpholine. Can be mentioned.

Cyclohexyl maleimide, isopropyl maleimide, N-cyclohexyl maleimide, itaciconimide etc. are mentioned as said imide group containing monomer.

Examples of the epoxy group-containing monomers include glycidyl (meth) acrylate, methylglycidyl (meth) acrylate, allyl glycidyl ether, and the like.

The ether group-containing monomers include 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, butoxyethyl (meth) acrylate, phenoxyethyl (meth) acrylate, and acryloyl. Morpholine, and the like.

The monomer having a crosslinkable functional group may be included in an amount of 0.1 to 15% by weight, preferably 1 to 8% by weight, based on the total monomer content (100% by weight) used in preparing the acrylic copolymer. If the content is less than 0.1% by weight, the cohesive force of the pressure-sensitive adhesive is reduced, such as physical properties such as adhesive durability and cutting properties can be lowered, if the content exceeds 15% by weight the residual stress relaxation effect is relatively low.

The acrylic copolymer composed of the above components reinforces the cohesion by controlling the content of a monomer containing a crosslinkable functional group and a (meth) acrylic acid ester monomer for producing a homopolymer having a glass transition temperature of -90 to 10 ° C in the copolymer. Thereby improving adhesion durability and cutting property or vice versa.

The method for producing the acrylic copolymer is not particularly limited, and may be prepared by conventional polymerization methods such as solution polymerization, photopolymerization, bulk polymerization, suspension polymerization or emulsion polymerization, preferably solution polymerization It is to manufacture. At this time, it is preferable that polymerization temperature is 50-110 degreeC, and it is preferable to add a polymerization initiator in the state which mixed the monomer uniformly.

The acrylic copolymer may have a weight average molecular weight (polystyrene equivalent) measured by gel permeation chromatography (GPC) method, in general, 50,000 to 2,000,000.

The crosslinking agent is used to reinforce the cohesive force of the pressure-sensitive adhesive composition by appropriately crosslinking the acrylic copolymer, and an isocyanate compound, an epoxy compound, a melamine resin, an aziridine compound, or the like may be used. Preferably, an isocyanate compound or an epoxy compound is used. Can be. These can be used individually or in combination of 2 or more types.

As said isocyanate compound, tolylene diisocyanate, xylene diisocyanate, hexamethylene diisocyanate, 2, 4- diphenyl methane diisocyanate, 4, 4- diphenyl methane diisocyanate, isophorone diisocyanate, tetramethyl xylene diisocyanate And naphthalene diisocyanate.

Examples of the epoxy compound include ethylene glycol diglycidyl ether, triglycidyl ether, trimethylolpropane triglycidyl ether, N, N, N ', N'-tetraglycidyl diamine, glycerin diglycidyl ether, and 1 , 3-bis (N, N- diglycidylaminomethyl) cyclohexane, etc. are mentioned.

Hexamethylol melamine is mentioned as said melamine type resin.

Examples of the aziridine-based compound include N, N'-toluene-2,4-bis (1-aziridinecarboxide) and N, N'-diphenylmethane-4,4'-bis (1-aziridinecarboxa) Id), triethylene melamine, bisisoprotaloyl-1- (2-methylaziridine), tri-1-aziridinylphosphine oxide, etc. are mentioned.

The crosslinking agent is preferably included in an amount of 0.01 to 15 parts by weight based on 100 parts by weight of the acrylic copolymer (based on the solid content). If the content is less than 0.01 parts by weight, the adhesive force or cohesive force of the pressure-sensitive adhesive is not good, and if it exceeds 15 parts by weight, the compatibility is reduced, the surface migration may occur and the crosslinking reaction is too advanced to reduce the adhesive strength.

The silane coupling agent is for further strengthening the adhesive force at the time of bonding with the liquid crystal cell or the substrate, and a known silane coupling agent may be used. Preferably, for example, 3-glycidoxypropyltrimethoxysilane can be used as the silane coupling agent containing an epoxy group. The epoxy group of the silane coupling agent is bonded to the crosslinkable functional group of the acrylic copolymer, and the alkoxysilane portion is strongly bonded to the glass substrate of the liquid crystal cell, thereby improving adhesion stability and further improving heat and moisture resistance characteristics, especially in high temperature or humidity conditions. When left under a long time under the role of helping to improve the adhesion durability.

The silane coupling agent is preferably included in 0.01 to 1 parts by weight based on 100 parts by weight of the acrylic copolymer (based on the solid content). When the content is less than 0.01 parts by weight, the adhesive force with the liquid crystal cell may be weak, and when the content exceeds 1 part by weight, the reworkability is not good.

First, in the case of the pressure-sensitive adhesive composition having a low storage modulus (G ′), a weight average molecular weight of a copolymer including a crosslinkable functional group, that is, an acrylic copolymer was adjusted. Specifically, it is preferable to use a low molecular weight copolymer having a weight average molecular weight of 50,000 or more and less than 500,000 alone as an acrylic copolymer having a low storage modulus (G ′). In addition, when (a) a high molecular weight copolymer having a weight average molecular weight of 500,000 to 2,000,000, preferably 1,000,000 to 1,500,000, (a) 100 weight parts of the copolymer (based on the solid content), (b) the weight average molecular weight 5 to 50 parts by weight, preferably 10 to 40 parts, of a low molecular weight copolymer having 50,000 to 500,000, preferably 100,000 to 400,000 can be used.

In addition, the pressure-sensitive adhesive composition may further include a plasticizer to further lower the storage modulus (G ₁ ′). Specific examples of the plasticizer include esters such as phthalic acid esters, trimellitic acid esters, pyromellitic acid esters, azipine acid esters, sebacic acid esters, and glycol esters, and liquid resins such as process oils and liquid polyethers. These can be used individually or in combination of 2 or more types. The content of the plasticizer is not particularly limited, and may be included in an amount of 0.1 to 50 parts by weight, preferably 1 to 30 parts by weight, based on 100 parts by weight of the acrylic copolymer (based on the solid content).

Next, in the case of the pressure-sensitive adhesive composition showing a high storage modulus (G ′), in order to obtain a high storage modulus (G ₂ ′), an acrylic copolymer having a weight average molecular weight of 1,000,000 to 1,500,000 is composed of an ultraviolet curable compound, a cellulose resin, and fine particles. At least one selected from the group was added.

The ultraviolet curable compound may use a polyfunctional (meth) acrylate monomer having a weight average molecular weight of less than 1,000. As a specific example, 1, 4- butanediol di (meth) acrylate, 1, 6- hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, polyethyleneglycol di (meth) acrylate, dicyclo Fentanyldi (meth) acrylate, caprolactone modified dicyclopentenyldi (meth) acrylate, ethylene oxide modified phosphoric acid di (meth) acrylate, di (acryloxyethyl) isocyanurate, allylated cyclohexyldi (meth) 2) such as acrylate, dimethylol dicyclopentane diacrylate, ethylene oxide modified hexahydrophthalic acid diacrylate, tricyclodecane dimethanol acrylate, neopentyl glycol modified trimethylolpropanediacrylate and adamantane diacrylate Functional monomers; Trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylolpropane Trifunctional monomers such as tri (meth) acrylate and tris (acryloxyethyl) isocyanurate; Tetrafunctional monomers such as diglycerin tetra (meth) acrylate and pentaerythritol tetra (meth) acrylate; Pentafunctional monomers such as propionic acid-modified dipentaerythritol penta (meth) acrylate; And 6 functional monomers, such as caprolactone modified dipentaerythritol hexa (meth) acrylate, etc. are mentioned. In addition, as the ultraviolet curable compound, an ultraviolet curable oligomer having a weight average molecular weight of 50,000 or less may be used. For example, polyester acrylate type, epoxy acrylate type, urethane acrylate type, polyether acrylate type, polybutadiene acryl Oligomers, such as a acrylate type and a silicone acrylate type, can be mentioned. These can be used individually or in combination of 2 or more types.

The ultraviolet curable compound may be included in an amount of 1 to 100 parts by weight based on 100 parts by weight of the acrylic copolymer (based on the solid content).

The ultraviolet curable compound may be used with a photopolymerization initiator that generates radicals or cations by irradiating ultraviolet rays.

Specific examples of the photopolymerization initiator include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2 , 2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenyl Ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propane-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2- Propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-t-butylanthraquinone, 2- Aminoanthraquinone, 2-methyl thioxanthone, 2-ethyl thioxanthone, 2-chlorothioxanthone, 2,4-dimethyl thioxanthone, 2,4-diethyl thioxanthone, benzyl dimethyl ketal, acetophenone Dimethyl ketal, p-dimethylaminobenzoic acid Le, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide and the like, these may be used alone or in combination of two or more.

The photopolymerization initiator may be included in an amount of usually 0.2 to 20 parts by weight based on 100 parts by weight of the ultraviolet curable compound (based on the solid content).

The cellulose resin is a resin which gives a high storage modulus by reacting with a functional group of a crosslinking agent, and preferably has a weight average molecular weight of 10,000 to 100,000 and a content of hydroxy group of 3 to 20% by weight. Specific examples include cellulose acetate (CA), cellulose acetate butyrate (CAB), cellulose acetate propionate (CAP), carboxymethyl cellulose (CMC), cellulose nitrate (cellullose nitrate, CN), cellulose propionate (CP), ethyl cellulose (EC), carboxymethyl cellulose acetate butyrate (CMCAB), and the like. It can be used in combination of two or more kinds.

The cellulose resin may be included in 10 to 70 parts by weight based on 100 parts by weight of the acrylic copolymer (based on the solid content), preferably 10 to 65 parts by weight in consideration of compatibility with other components included in the pressure-sensitive adhesive composition, More preferably, it is 10-60 weight part.

The fine particles have the same refractive index as the acrylic copolymer, and organic particles, inorganic particles, organic-inorganic composite particles, and the like can be used. Examples of the organic particles include acrylic resins such as polymethyl methacrylate resins, polystyrene resins, styrene-acrylic copolymer resins, polyethylene resins, epoxy resin particles, and the like, and inorganic particles include silica, potassium carbonate, aluminum hydroxide, and hydroxides. Particles, such as magnesium and titanium dioxide, are mentioned. In addition, examples of the organic-inorganic composite particles include particles having a core-shall structure in which surfaces of inorganic particles such as silica are modified. Among these, organic particles and organic-inorganic composite particles are preferred in terms of excellent dispersibility in acrylic copolymers, and more preferably organic-inorganic composite particles having modified surfaces of polymethyl methacrylate particles and silica particles. .

The fine particles may be included in 10 to 70 parts by weight with respect to 100 parts by weight of the acrylic copolymer (based on solids content), preferably 10 to 60 parts by weight.

As described above, the pressure-sensitive adhesive layer having a storage modulus (G ′) of various ranges can be formed by adjusting the pressure-sensitive adhesive composition. Among these, the storage modulus (G ₁ ′) of the first adhesive layer is preferably 1.0 × 10 ³ to 1.0 × 10 ⁶ Pa at 23 ° C., more preferably 1.0 × 10 ⁴ Pa to 1.0 × 10 ⁶ Pa The storage modulus (G ₂ ′) of the second adhesive layer is preferably 1.0 × 10 ⁵ to 1.0 × 10 ⁸ Pa at 23 ° C., more preferably 1.0 × 10 ⁵ to 1.0 × 10 ⁷ Pa. It is preferable that the storage modulus (G ₂ ′) of the second adhesive layer is greater than the storage modulus (G ₁ ′) of the first adhesive layer. Further, the difference (G ₂ ′ -G ₁ ′) between the storage modulus (G ₂ ′) of the second adhesive layer and the storage modulus (G ₁ ′) of the first adhesive layer is 1.0 × 10 ⁵ Pa or more, preferably 3.0 It is preferable that it is x 10 ⁵ Pa. If the conditions for the storage modulus (G ′) of the first pressure sensitive adhesive layer and the second pressure sensitive adhesive layer are not satisfied, bonding bubbles are generated when the polarizer and the pressure sensitive adhesive layer are bonded, and durability is deteriorated. This gets worse.

The total sum of the thicknesses of the first adhesive layer and the second adhesive layer may be 1 to 50 μm, and preferably 5 to 30 μm.

The method of laminating such a first adhesive layer and a second adhesive layer is not particularly limited as long as it is a method commonly used in the art. For example, a flow casting method, a bar-coater, an air knife, gravure, reverse rolls, and kiss rolls on a release film having a release film or a silicone release coating layer formed thereon The first adhesive layer and the second adhesive layer (or adhesive sheet) are applied directly by a suitable development method using a coating method such as a kiss roll, a spray or a blade method, and then dried and then thermally or UV-cured. Form each. After laminating the formed first adhesive layer on one side of the polarizer, the second adhesive layer may be laminated on the first adhesive layer while removing the release film of the first adhesive layer.

The release film 24 may use a polyester-based film that is unstretched, uniaxially or biaxially stretched. For example, a film formed from a single or two or more blends of polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, polybutylene terephthalate and the like can be used. Polyethylene terephthalate and polyethylene naphthalate films are preferred from the viewpoint of heat resistance or easy silicone release treatment on the surface, and polyethylene terephthalate films are more preferred in view of cost.

In addition, the release film may be a release coating layer formed on the polyester film. The type of release agent used in the release coating is not particularly limited, and it is preferable to use an addition-reactive silicone release agent that cures the heat resistance of the polyester film at a relatively low temperature among the silicone release agents, and a release agent capable of performing heat and ultraviolet curing in parallel. You can also use

The thickness of the release film is not particularly limited, but is preferably 10 to 100 μm in view of convenience in handling and price in use.

As described above, in the thin film type polarizing plate in which the transparent protective film, the polarizer, the first adhesive layer, the second adhesive layer, and the release film are sequentially provided, the storage modulus (G ₂ ′) of the second adhesive layer is stored in the first adhesive layer. By adjusting it to have a value greater than the elastic modulus (G ₁ ′), it is possible to simultaneously solve problems such as increase in shrinkage of the polarizing plate due to low storage modulus of elasticity, light leakage, and the problem of occurrence of bonding bubbles and deterioration of durability due to high storage modulus. have.

In addition, the liquid crystal display of the present invention is characterized in that the thin film type polarizing plate is provided on at least one side of the liquid crystal cell.

In the present invention, since the liquid crystal display device is well known to those skilled in the art of the present invention, a detailed description of each configuration is omitted.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but the following examples are merely for exemplifying the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. It is natural that such variations and modifications fall within the scope of the appended claims.

In the following Examples and Comparative Examples, "%" and "parts" indicating contents are by weight unless otherwise specified.

Synthesis Example 1. Preparation of Acrylic Copolymer A

A 4-neck jacket reactor (1L) was equipped with a stirrer, a thermometer, a reflux condenser, a dropping lot, and a nitrogen gas introduction tube. Nitrogen gas was introduced into the reactor, and then replaced. 120 parts of ethyl acetate, n- 98.1 parts of butyl acrylate, 0.5 part of acrylic acid, and 1.4 parts of # 2-hydroxyethyl acrylate were thrown in, and the reactor external temperature was heated up at 50 degreeC. Subsequently, a solution in which 0.1 part of 2,2'-azobisisobutyronitrile (AIBN) was completely dissolved in 10 parts of ethyl acetate was added dropwise to the reactor. After the reaction was continued for an additional 5 hours while maintaining the jacket outside temperature at 50 ° C, 90 parts of ethyl acetate was slowly added dropwise using a dropping lot for 1 hour. In addition, the reaction was continued for an additional 5 hours while maintaining the jacket outside temperature at 50 ℃, and when the reaction was completed, diluted with ethyl acetate to obtain an acrylic copolymer A solution having a solid content of 20%. The weight average molecular weight (in terms of polystyrene) of the prepared acrylic copolymer A was about 1,500,000 by GPC method.

Synthesis Example 2 Preparation of Acrylic Copolymer B

A 4-neck jacket reactor (1L) was equipped with a stirrer, a thermometer, a reflux condenser, a dropping lot, and a nitrogen gas introduction tube. Nitrogen gas was introduced into the reactor, and then replaced. 200 parts of ethyl acetate, n- 90 parts of butyl acrylate, 5.0 parts of acrylic acid, and 4.5 parts of # 2-hydroxyethyl acrylate were thrown in, and the reactor external temperature was heated up at 70 degreeC. Then, a solution in which 0.5 parts of 2,2'-azobisisobutyronitrile (AIBN) was completely dissolved in 10 parts of ethyl acetate was added dropwise to the reactor. After the reaction was continued for an additional 3 hours while maintaining the jacket outside temperature at 65-70 ° C, 90 parts of ethyl acetate was slowly added dropwise using a dropping lot for 1 hour. In addition, the reaction was continued for an additional 5 hours while maintaining the jacket outside temperature at 50 ℃, and when the reaction was completed, diluted with ethyl acetate to obtain an acrylic copolymer B solution having a solid content of 20%. The weight average molecular weight (in terms of polystyrene) of the prepared acrylic copolymer B was about 370,000.

Preparation Example 1 Preparation of Adhesive Layer I

100 parts of acrylic copolymer A (based on solids content) prepared in Synthesis Example 1, 0.8 parts of trimethylolpropane-modified tolylene diisocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Industry) as a crosslinking agent, 3-glycol as a silane coupling agent 0.15 parts of cydoxipropyl trimethoxysilane (brand name: KBM-403, manufactured by Shinetsu), 15 parts of tri (acryloxyethyl) isocyanurate (brand name: manufactured by Aronix M-315, manufactured by Toagosei), an ultraviolet curable compound, A solution obtained by dispersing 1.5 parts of a weight ratio 1: 1 mixture (brand name Irgacure 500, Ciba Specialty Chemicals Co., Ltd.) of benzophenone and 1-hydroxycyclohexyl phenyl ketone as a photopolymerization initiator in an ethyl acetate solvent was added thereto, followed by ethyl acetate. It was diluted to an appropriate concentration using to prepare a pressure-sensitive adhesive composition.

The prepared pressure-sensitive adhesive composition was dried on a plurality of PET release films (heavy peeling film) (25 cm × 20 cm) coated with a release agent by using an applicator, and then applied to each of the adhesive to have a thickness of 10-15 μm, 100 A pressure-sensitive adhesive sheet was prepared by drying for 3 minutes in a forced hot air dryer of an oven. Then, another release film (hard peeling film) was laminated on the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet to prepare a NCF (non-carrier film) form.

Preparation Example 2 Preparation of Adhesive Layer II

The UV curable compound and the photopolymerization initiator were not used. Instead, 20 parts of cellulose acetate butyrate (trade name: CAB-553-0.4, manufactured by Eastman) was used in the same manner as in Preparation Example 1 above.

Preparation Example 3 Preparation of Adhesive Layer III

In the same manner as in Preparation Example 1, except that 20 parts of polymethyl methacrylate (PMMA) particles (trade name: MX-1000, manufactured by Soken Chemical Co., Ltd.) were not used without using an ultraviolet curable compound and a photopolymerization initiator. Was performed.

Preparation Example 4 Preparation of Adhesive Layer IV

The same process as in Preparation Example 1 was conducted except that no UV-curable compound and a photopolymerization initiator were used.

Preparation Example 5 Preparation of Adhesive Layer V

The UV curable compound and the photopolymerization initiator were not used. Instead, 10 parts of the acrylic copolymer B prepared in Synthesis Example 2 (based on the solid content) were used in the same manner as in Preparation Example 1 above.

Preparation Example 6 Preparation of Adhesive Layer VI

The UV curable compound and the photopolymerization initiator were not used. Instead, 30 parts of the acrylic copolymer B prepared in Synthesis Example 2 (based on the solid content) were used in the same manner as in Preparation Example 1 above.

The components of the pressure-sensitive adhesive composition of Preparation Examples 1 to 6 and their contents are shown in Table 1 below. At this time, the content of each component represents parts by weight.

division Copolymer Copolymer Bridge construction Silane coupling agent UV Curable Compound Cellulose resin Particulate A B COR-L KBM-403 M-315 CAB-553-0.4 XM-1000 Preparation Example 1 100 - 0.8 0.15 15 - - Preparation Example 2 100 - 0.8 0.15 - 20 - Preparation Example 3 100 - 0.8 0.15 - - 20 Production Example 4 100 - 0.8 0.15 - - - Preparation Example 5 100 10 0.8 0.15 - - - Preparation Example 6 100 30 0.8 0.15 - - -

The storage modulus of the NCF-type pressure sensitive adhesive sheets prepared in Preparation Examples 1 to 6 was measured by the following method, and the results are shown in Table 2 below.

* Storage modulus (G ′, Pa)-Circumferential shaped specimens of 8 mm Φ × 1 mm are made and twisted at a frequency of 1 Hz and 23 ° C using a dynamic viscoelasticity measuring device (DYNAMIC ANALYZER RDA II, manufactured by REOMETRIC). It was measured by the torsional shear method.

division designation Storage modulus (G ′, Pa) Preparation Example 1 Adhesive layer Ⅰ 8.35 × 10 ⁶ Preparation Example 2 Adhesive layer Ⅱ 1.60 × 10 ⁶ Preparation Example 3 Adhesive layer Ⅲ 7.01 × 10 ⁵ Production Example 4 Adhesive layer Ⅳ 2.32 × 10 ⁵ Preparation Example 5 Adhesive Layer Ⅴ 8.38 × 10 ⁴ Preparation Example 6 Adhesive layer Ⅵ 5.12 × 10 ⁴

Example 1

Bonding a triacetyl cellulose (TAC) film having a thickness of 40 μm to one side of a 25 μm thick polarizer with iodine adsorbed onto a polyvinyl alcohol resin film using an adhesive comprising polyvinyl alcohol and a water-soluble epoxy resin It was. Subsequently, the pressure-sensitive adhesive layers V and I manufactured in the form of NCF were sequentially bonded to the other side of the polarizer to prepare a thin film polarizing plate.

Example 2

The same process as in Example 1 was performed except that the pressure-sensitive adhesive layers IV and II prepared in the form of NCF were sequentially bonded to the other side of the polarizer.

Example 3

The same process as in Example 1 was performed except that the pressure-sensitive adhesive layers V and II prepared in the form of NCF were sequentially bonded to the other side of the polarizer.

Example 4

The same method as in Example 1 was performed except that the pressure-sensitive adhesive layers VI and II prepared in the form of NCF were sequentially bonded to the other side of the polarizer.

Example 5

The same process as in Example 1 was performed except that the pressure-sensitive adhesive layers IV and III prepared in the form of NCF were sequentially bonded to the other side of the polarizer.

Example 6

The same method as in Example 1 was performed except that the pressure-sensitive adhesive layers V and IV prepared in the form of NCF were sequentially bonded to the other side of the polarizer.

Comparative Example 1

The same process as in Example 1 was carried out except that only the adhesive layer I prepared in the form of NCF was bonded to the other side of the polarizer.

Comparative Example 2

The same process as in Example 1 was carried out except that only the adhesive layer II prepared in the form of NCF was bonded to the other side of the polarizer.

Comparative Example 3

The same process as in Example 1 was carried out except that only the adhesive layer III prepared in the form of NCF was bonded to the other side of the polarizer.

Comparative Example 4

The same process as in Example 1 was carried out except that only the adhesive layer IV prepared in the form of NCF was bonded to the other side of the polarizer.

Comparative Example 5

The same process as in Example 1 was carried out except that only the pressure-sensitive adhesive layer V made of NCF was bonded to the other side of the polarizer.

Comparative Example 6

The same process as in Example 1 was carried out except that only the pressure-sensitive adhesive layer VI made of NCF was bonded to the other side of the polarizer.

Comparative Example 7

The same process as in Example 1 was performed except that the pressure-sensitive adhesive layers I and VI prepared in the form of NCF were sequentially bonded to the other side of the polarizer.

Comparative Example 8

The same process as in Example 1 was carried out except that the adhesive layers II and IV, which were prepared in the form of NCF, were sequentially bonded to the other side of the polarizer.

Comparative Example 9

The same process as in Example 1 was carried out except that the adhesive layers II and V prepared in the form of NCF were sequentially bonded to the other side of the polarizer.

Comparative Example 10

The same process as in Example 1 was performed except that the pressure-sensitive adhesive layers II and VI prepared in the form of NCF were sequentially bonded to the other side of the polarizer.

Comparative Example 11

The same process as in Example 1 was performed except that the pressure-sensitive adhesive layers III and IV prepared in the form of NCF were sequentially bonded to the other side of the polarizer.

Test Example

The physical properties of the thin film polarizers prepared in Examples and Comparative Examples were measured by the following method, and the results are shown in Table 3 below.

(1) Bonding bubbles (bonding bubbles between the first adhesive layer and the polarizer)-The amount of bonded bubbles generated in the manufactured thin film polarizing plate was visually observed and evaluated based on the following criteria.

◎: no bonding bubble

○: almost no bonding bubbles

△: somewhat bonded bubble

X: There is bonding bubble generation

(2) Durability-The thin film polarizing plate was cut into a size of 15 cm × 15 cm, and then bonded to Corning # 1737 glass to prepare a specimen. The prepared specimens were treated in an autoclave for 5 minutes at 50 ° C. for 20 minutes and then left in an 80 ° C. oven for 300 hours. Peeling phenomena such as lifting and peeling of the specimen left undisturbed and bubbles were observed visually, and evaluated based on the following criteria. At this time, the peeling phenomenon and the bubble includes all generated between the polarizer and the pressure-sensitive adhesive layer, and between the pressure-sensitive adhesive layer and the glass.

(Double-circle): No peeling phenomenon and bubble generation (very good)

(Circle): Peeling phenomenon and bubble generation hardly exist (good)

(Triangle | delta): Peeling phenomenon and bubble generation are a little (usually)

X: peeling phenomenon and bubble generation (defect)

(3) Reworkability-The prepared thin film polarizing plate was cut to a size of 15 cm × 15 cm, and then bonded to Corning # 1737 glass to prepare a specimen. After the prepared specimens were treated at 5 atmospheres and 50 ° C. for 20 minutes in an autoclave, the bonded thin film polarizing plate was peeled from the corners while spraying water at about 25 ° C. on the peeling interface between the pressure-sensitive adhesive layer and glass. At this time, the ease of peeling and the adhesive which remain | survives in glass were observed sensually, and it evaluated based on the following criteria.

(Double-circle): Peeling is easy and adhesive does not remain in glass (very good)

(Circle): It is easy to peel and some adhesive remains in glass (good)

(Triangle | delta): Peeling is a little difficult and adhesive remains in glass (usually)

X: Peeling is very difficult and adhesive remains in glass (defect)

(4) Light leakage test (light leakage)-The prepared thin film polarizing plate was cut into 20cm × 20cm size and the specimen was prepared by attaching the optical absorption axis at 90 ° to both sides of Corning # 1737 glass. . The prepared specimens were treated in an autoclave for 5 minutes at 50 ° C. for 20 minutes and then left in an 80 ° C. oven for 300 hours. Thereafter, in order to investigate the light leakage (light transmittance nonuniformity) of the produced specimen, the naked eye was observed whether there was light leakage, and evaluated based on the following criteria.

(Double-circle): It is difficult to visually judge the nonuniformity of light transmittance.

○: some light unevenness

(Triangle | delta): There exist many non-uniformity of light transmittance

X: There exists a nonuniform phenomenon of light transmittance clearly.

division First
Adhesive layer 2nd
Adhesive layer Storage modulus difference
(G ₂ ′ -G ₁ ′) Junction bubble durability Reworkability Light leak Example 1 Ⅵ I 8.30 × 10 ⁶ ◎ ◎ ◎ ◎ Example 2 Ⅳ Ⅱ 1.37 × 10 ⁶ ○ ○ ◎ ◎ Example 3 Ⅴ Ⅱ 1.52 × 10 ⁶ ◎ ◎ ◎ ◎ Example 4 Ⅵ Ⅱ 1.55 × 10 ⁶ ○ ○ ◎ ◎ Example 5 Ⅳ Ⅲ 4.69 × 10 ⁵ ○ ○ ○ ○ Example 6 Ⅴ Ⅳ 1.48 × 10 ⁵ ◎ ◎ △ △ Comparative Example 1 I - - × × ◎ ◎ Comparative Example 2 Ⅱ - - △ × ◎ ◎ Comparative Example 3 Ⅲ - - △ △ ○ ○ Comparative Example 4 Ⅳ - - ○ ○ △ △ Comparative Example 5 Ⅴ - - ◎ ◎ × △ Comparative Example 6 Ⅵ - - ◎ ◎ × × Comparative Example 7 I Ⅵ -8.30 × 10 ⁶ × × △ △ Comparative Example 8 Ⅱ Ⅳ -1.37 × 10 ⁶ △ × △ △ Comparative Example 9 Ⅱ Ⅴ -1.52 × 10 ⁶ △ × × △ Comparative Example 10 Ⅱ Ⅵ -1.55 × 10 ⁶ △ × × × Comparative Example 11 Ⅲ Ⅳ -4.69 × 10 ⁵ △ △ △ △

As shown in Table 3, according to the present invention is composed of two pressure-sensitive adhesive layer having a first and second, the storage modulus of the second adhesive layer (G ₂ ') the storage elastic modulus of the first adhesive layer (G ₁ ′) The thin film polarizing plates of Examples 1 to 6 adjusted to have a larger value were found to have suppressed generation of bonding bubbles, and improved durability, reworkability, and light leakage phenomenon. In addition, in Example 6 in which the difference in storage modulus (G ₂ ′ -G ₁ ′) is less than 3.0 × 10 ⁵ Pa, the properties of the adhesives between the layers are similar to improve physical properties, in particular, rework and light leakage. Somewhat insignificant. Therefore, it was confirmed that the difference in storage modulus (G ₂ ′ -G ₁ ′) is more preferably 3.0 × 10 ⁵ Pa or more.

On the other hand, the thin film polarizing plates of Comparative Examples 1 to 6 in which one pressure-sensitive adhesive layer is laminated have a low storage modulus (G ′), but the generation and durability of bonding bubbles are improved, but light leakage and rework property are deteriorated. In the case of high (G ′), the opposite trend was observed. In addition, in the case of the thin film type polarizing plates of Comparative Examples 7 to 11 in which the storage modulus (G ₁ ′) of the first adhesive layer is adjusted so that the storage modulus (G ₂ ′) of the second adhesive layer has a large value. Physical properties could not be satisfied at the same time.

That is, in order to satisfy physical properties such as generation of bonded bubbles, durability, rework property and light leakage in a thin film type polarizing plate, not only the two pressure sensitive adhesive layers having different storage modulus are laminated but also the size of the storage elastic modulus of each pressure sensitive adhesive layer It was confirmed that the control is an important factor.

1 is a view showing a cross section of a conventional thin film polarizing plate,

2 is a cross-sectional view of a thin film polarizing plate of the present invention.

Explanation of symbols on the main parts of the drawings

10: thin film polarizing plate (conventional) 11, 21: transparent protective film

12, 22: polarizer 13: adhesive layer

14, 24: release film 20: thin film type polarizing plate (present invention)

23-1: first adhesive layer having a storage modulus (G ₁ ′) of less than G ₂ ′ and 1.0 × 10 ⁴ to 1.0 × 10 ⁶ Pa at 23 ° C.

23-2: A second adhesive layer having a storage modulus (G ₂ ′) greater than G ₁ ′ and 1.0 × 10 ⁵ to 1.0 × 10 ⁷ Pa at 23 ° C.

Claims (6)

A transparent polarizing film, a polarizer, a first adhesive layer, a second adhesive layer, and a release film in a thin film type polarizing plate in order, the storage modulus (G ₂ ') of the second adhesive layer is the storage modulus (G) of the first adhesive layer ₁ ′) larger than the thin film type polarizing plate. The method of claim 1, wherein the difference between the storage modulus (G ₂ ') of the second adhesive layer and the storage modulus (G ₁ ') of the first adhesive layer (G ₂ '-G ₁ ') is 3.0 × 10 ⁵ Pa The above-mentioned thin film type polarizing plate. The thin film type polarizing plate of claim 1, wherein the storage modulus (G ₁ ′) of the first adhesive layer is 1.0 × 10 ⁴ to 1.0 × 10 ⁶ Pa at 23 ° C. The thin film type polarizing plate of claim 1, wherein the storage modulus (G ₂ ′) of the second adhesive layer is 1.0 × 10 ⁵ to 1.0 × 10 ⁷ Pa at 23 ° C. The thin film type polarizing plate of claim 1, wherein a total thickness of the first adhesive layer and the second adhesive layer is 1 to 50 μm. A liquid crystal display device comprising the thin film type polarizer of any one of claims 1 to 5 on at least one side of a liquid crystal cell.

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