KR20180065920A - Polarizing plate and liquid crystal display device - Google Patents

Abstract

An object of the present invention is to provide a polarizing plate to efficiently manufacture a liquid crystal display device without causing multiple ejection or product defects and obtain excellent operability of a touch panel. To achieve the object, provided is a polarizing plate having a first transparent resin layer on one side of a polarizer and a second transparent resin layer on the other side. The thickness of the polarizer is 15 μm or less. The surface resistance of the first transparent resin layer is not less than 1.0×10^9 Ω/□ and not more than 1.0×10^11 Ω/□. The second transparent resin layer has an antistatic function. A distance between the first transparent resin layer and the second transparent resin layer is 80 μm or less.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a polarizing plate,

The present invention relates to a polarizing plate and a liquid crystal display.

BACKGROUND ART A liquid crystal display device is used in various display devices by taking advantage of features such as low power consumption, low voltage operation, light weight and thinness. Among liquid crystal display devices and the like, a liquid crystal display device in which an image display device and a touch panel are combined is popular. Among them, capacitive touch panels are rapidly spreading due to their functionality.

Patent Document 1 discloses that a transparent resin layer having a surface resistance value of 1.0 × 10 ¹³ Ω / □ or less is disposed on the side (view side) far from the liquid crystal cell in the viewer-side polarizing plate. Specifically, in a polarizing plate in which a triacetyl cellulose film is bonded to both sides of a polarizer having a thickness of 20 탆 and a pressure-sensitive adhesive layer is laminated on a triacetyl cellulose film, an ionic compound is contained in the pressure- And a polarizing plate provided with an anti-reflection function.

There has been a problem of taking out a plurality of polarizing plates one at a time and taking out the polarizing plates one by one when the polarizing plates are taken out one by one from the laminated product of the polarizing plates cut into wafers at the time of manufacturing the liquid crystal display device using the polarizing plate described in Patent Document 1.

In the case of including a step of peeling the surface protective film from the cover glass when manufacturing the liquid crystal display device using the polarizing plate described in Patent Document 1, static electricity is generated by peeling, thereby disorienting the orientation of the liquid crystal, There was a case where a defect occurred. On the other hand, since it is necessary to ensure the operability of the touch panel, the surface resistance value can not be lowered easily.

Patent Document 1: JP-A-2015-200698

An object of the present invention is to provide a polarizing plate capable of efficiently manufacturing a liquid crystal display device without causing multiple ejection or product defects and having excellent operability of a touch panel.

[1] A polarizing plate having a first transparent resin layer on one side of a polarizer and a second transparent resin layer on the other side,

Wherein the thickness of the polarizer is 15 占 퐉 or less,

Wherein the first transparent resin layer has a surface resistivity of 1.0 10 ⁹ ? /? And 1.0 10 ¹¹ ? /?

Wherein the second transparent resin layer has an antistatic function,

And the distance between the first transparent resin layer and the second transparent resin layer is 80 占 퐉 or less.

[2] A polarizing plate according to [1], wherein the protective film is provided between the first transparent resin layer or the second transparent resin layer and the polarizer.

[3] The protective film is selected from a cyclic olefin based resin film, a cellulose based resin film, a polycarbonate based resin film, a polyolefin based resin film, a polyethylene terephthalate based resin film, a methyl methacrylate based resin film and a brightness enhancement film , Wherein the polarizing plate is at least one film obtained by the following method.

[4] The polarizer according to any one of [1] to [3], wherein the first transparent resin layer and the second transparent resin layer are respectively disposed on the outermost side of the polarizer.

[5] A liquid crystal display device according to any one of [1] to [4], wherein the polarizing plate is disposed on the viewer side of the liquid crystal cell, and the front plate is disposed on the polarizing plate.

According to the present invention, it is possible to provide a polarizing plate capable of efficiently manufacturing a liquid crystal display device without causing multiple ejection or product defects, and having excellent operability of a touch panel.

1 is a schematic sectional view showing an example of the layer structure of a polarizing plate.
2 is a schematic cross-sectional view showing an example of the layer structure of the liquid crystal display device.
3 is a schematic sectional view of a polarizing plate for explaining the distance between the first transparent resin layer and the second transparent resin layer.

<Polarizer>

1 is a schematic cross-sectional view showing an example of the layer structure of the polarizing plate of the present invention. As shown in Fig. 1 (a), the polarizing plate of the present invention has a first transparent resin layer 10 on one side of the polarizer 1 and a second transparent resin layer 11 on the other side. 1 (b) and 1 (c), the polarizing plate of the present invention may have a protective film 20 between the first transparent resin layer 10 and the polarizer 1, 2 protective film 21 may be provided between the transparent resin layer 11 and the polarizer 1. In addition, the polarizing plate of the present invention may contain other films. Of course, the protective film may be provided outside the first transparent resin layer 10 and the second transparent resin layer 11, or may have another film.

In the polarizing plate of the present invention, the distance between the first transparent resin layer 10 and the second transparent resin layer 11 may be 80 占 퐉 or less and 70 占 퐉 or less. The distance between the first transparent resin layer 10 and the second transparent resin layer 11 is usually 20 m or more. 3, the distance between the first transparent resin layer 10 and the second transparent resin layer 11 is a distance from the surface of the first transparent resin layer 10 closer to the polarizer 1 To the surface of the second transparent resin layer 11 nearer to the polarizer 1, and corresponds to the distance indicated by both arrows 4 in Fig. According to the present invention, even when the distance between the first transparent resin layer (10) and the second transparent resin layer (11) is short and the influence of static electricity tends to be easily applied, it becomes difficult to cause defects . In addition, even if the distance between the first transparent resin layer 10 and the second transparent resin layer 11 is close to each other and multiple take-outs are likely to occur, the liquid crystal display device can be efficiently manufactured.

In the polarizing plate of the present invention, it is preferable that the first transparent resin layer and the second transparent resin layer are layers disposed on the outermost side of the polarizing plate, respectively. The polarizing plate may be laminated with a protective film and a separator peeled off in the course of manufacturing the liquid crystal display device. Since the protect film and the separator are not finally inserted into the liquid crystal display device, they are not regarded as the layer disposed on the outermost side of the polarizing plate in the present invention.

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

(Polarizer)

The polarizer to be used in the present invention is usually a step of uniaxially stretching a polyvinyl alcohol resin film, a step of adsorbing a dichroic dye by staining a polyvinyl alcohol resin film with a dichroic dye, a step of adsorbing a dichroic dye to a polyvinyl A step of treating an alcoholic resin film with an aqueous solution of boric acid, and a step of washing with water after treatment with an aqueous solution of boric acid.

As the polyvinyl alcohol-based resin, a saponified polyvinyl acetate-based resin can be used. Examples of the polyvinyl acetate-based resin include a copolymer of vinyl acetate, which is a homopolymer of vinyl acetate, and other monomers copolymerizable with vinyl acetate. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.

The degree of saponification of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol resin may be modified or polyvinyl formal or polyvinyl acetal modified with an aldehyde may be used. The degree of polymerization of the polyvinyl alcohol resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000.

A film formed of a polyvinyl alcohol resin is used as the original film of the polarizer. The polyvinyl alcohol resin can be formed by a known method. The film thickness of the polyvinyl alcohol original film is preferably about 5 to 35 μm, and more preferably 5 to 20 μm, in consideration of the thickness of the obtained polarizer being 15 μm or less. When the film thickness of the original film is 35 m or more, it is necessary to increase the draw ratio at the time of producing the polarizer, and the dimensional shrinkage of the resulting polarizer tends to increase.

On the other hand, when the film thickness of the original film is 5 m or less, the handling property at the time of stretching is lowered, and problems such as cutting during production tend to occur.

The uniaxial stretching of the polyvinyl alcohol resin film can be performed before, simultaneously with, or after dyeing the dichroic dye. When uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before the boric acid treatment or during the boric acid treatment. In addition, uniaxial stretching may be performed in these plural steps.

In the uniaxial stretching, the uniaxial stretching may be performed between rolls different in the main circumferential direction, or may be uniaxially stretched using a heat roll. The uniaxial stretching may be dry stretching in which the stretching is performed in the atmosphere, or may be a wet stretching in which the stretching is performed in a state in which the polyvinyl alcohol resin film is swollen with a solvent. The stretching magnification is usually about 3 to 8 times.

As a method of dyeing a polyvinyl alcohol resin film with a dichroic dye, for example, a method of immersing a polyvinyl alcohol resin film in an aqueous solution containing a dichroic dye is employed. Specific examples of the dichroic dye include iodine and dichroic dyes. It is preferable that the polyvinyl alcohol resin film is immersed in water before the dyeing treatment.

When iodine is used as the dichroic dye, a method in which a polyvinyl alcohol resin film is dipped in an aqueous solution containing iodine and potassium iodide is generally used. The content of iodine in this aqueous solution is usually about 0.01 to 1 part by weight per 100 parts by weight of water. The content of potassium iodide is usually about 0.5 to 20 parts by weight per 100 parts by weight of water. The temperature of the aqueous solution used for dyeing is usually about 20 to 40 캜.

The immersion time (dyeing time) for this aqueous solution is usually about 20 to 1,800 seconds.

On the other hand, when a dichroic dye is used as the dichroic dye, a method in which a polyvinyl alcohol resin film is dipped in an aqueous solution containing a water-soluble dichroic dye is employed. The content of the dichroic dye in the aqueous solution is usually about 1 × 10 ^-4 to 10 parts by weight per 100 parts by weight of water, and is preferably about 1 × 10 ^{-3 to} 1 part by weight. The aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing aid. The temperature of the dichroic dye aqueous solution used for dyeing is usually about 20 to 80 캜. The immersion time (dyeing time) in this aqueous solution is usually about 10 to 1,800 seconds.

The boric acid treatment after dyeing with the dichroic dye can be carried out by dipping the dyed polyvinyl alcohol resin film in an aqueous solution containing boric acid.

The amount of boric acid in the boric acid-containing aqueous solution is usually about 2 to 15 parts by weight, preferably 5 to 12 parts by weight, per 100 parts by weight of water. When iodine is used as the dichroic dye, it is preferable that the aqueous solution containing boric acid contains potassium iodide. The amount of potassium iodide in the boric acid-containing aqueous solution is generally about 0.1 to 15 parts by weight, preferably about 5 to 12 parts by weight, per 100 parts by weight of water. The immersion time for the boric acid-containing aqueous solution is usually about 60 to 1,200 seconds, preferably about 150 to 600 seconds, more preferably about 200 to 400 seconds. The temperature of the boric acid-containing aqueous solution is usually 50 占 폚 or higher, preferably 50 to 85 占 폚, and more preferably 60 to 80 占 폚.

The polyvinyl alcohol resin film after boric acid treatment is usually subjected to water washing treatment. The water washing treatment can be carried out, for example, by immersing a boric acid-treated polyvinyl alcohol resin film in water. The temperature of water in the water washing treatment is usually about 5 to 40 占 폚. The immersion time is usually about 1 to 120 seconds.

After washing with water, drying treatment is carried out to obtain a polarizer. The drying treatment can be performed using a hot-air dryer or a far-infrared heater. The drying treatment is usually carried out at a temperature of 30 to 100 캜, preferably 50 to 80 캜. The drying treatment time is usually about 60 to 600 seconds, preferably 120 to 600 seconds.

By the drying treatment, the water content of the polarizer is reduced to a practically acceptable level. The water content thereof is usually 5 to 20% by weight, preferably 8 to 15% by weight. If the moisture content is less than 5% by weight, the flexibility of the polarizer is lost, and the polarizer may be damaged or broken after drying.

If the moisture content exceeds 20% by weight, the thermal stability of the polarizer may be deteriorated.

Further, the stretching, dyeing, boric acid treatment, washing and drying steps of the polyvinyl alcohol resin film in the production process of the polarizer may be carried out in accordance with the method described in, for example, Japanese Patent Laid-Open Publication No. 159778/1989. In the method described in this document, a polyvinyl alcohol-based resin layer to be a polarizer is formed by coating a polyvinyl alcohol-based resin on a base film.

In the present invention, the thickness of the polarizer constituting the polarizing plate is 15 占 퐉 or less. The distance between the first transparent resin layer 10 and the second transparent resin layer can be easily adjusted and the shrinking force of the polarizer itself can be made small by setting the thickness of the polarizer to 15 m or less, It is also possible to prevent peeling under the conditions. In this respect, in the present invention, the polarizer is preferably 13 占 퐉 or less, and may be 10 占 퐉 or less. The thickness of the polarizer is usually 2 占 퐉 or more in that it is easy to impart desired optical characteristics.

(Protective film)

The protective film is composed of a resin film and can also be composed of a transparent resin film. Particularly, it is preferable to be made of a material excellent in transparency, mechanical strength, thermal stability, moisture barrier property and the like. When the first transparent resin layer is an optical layer such as a hard coat layer, an antiglare layer, a light diffusion layer, and an antireflection layer, a protective film may be used as a substrate for forming the optical layer. In the present specification, the term "transparent" means that the single light transmittance in the visible light region is 80% or more. As the protective film, a cured layer of an active energy ray-curable resin composition may also be used.

When a protective film is laminated on both sides of a polarizer, the same protective film may be used, or different protective films may be used.

The resin forming the protective film is not particularly limited, and examples thereof include resins such as methyl methacrylate resin, polyolefin resin, cyclic olefin resin, polyvinyl chloride resin, cellulose resin, styrene resin, acrylonitrile Butadiene styrene resin, acrylonitrile styrene resin, polyvinyl acetate resin, polyvinylidene chloride resin, polyamide resin, polyacetal resin, polycarbonate resin, modified polyphenylene ether resin , Polybutylene terephthalate resin, polyethylene terephthalate resin, polysulfone resin, polyether sulfone resin, polyarylate resin, polyamideimide resin and polyimide resin.

These resins may be used alone or in combination of two or more. These resins may be used after carrying out any appropriate polymer denaturation. Examples of the polymer denaturation include those involving copolymerization, crosslinking, molecular terminal modification, stereoregularity control, and reactions between dissimilar polymers And the like.

Of these, as the material of the protective film, it is preferable to use a methyl methacrylate resin, a polyethylene terephthalate resin, a polyolefin resin or a cellulose resin. The polyolefin-based resin referred to herein includes a chain-like polyolefin-based resin and a cyclic polyolefin-based resin.

The methyl methacrylate resin is a polymer containing 50% by weight or more of methyl methacrylate units. The content of methyl methacrylate units is preferably 70% by weight or more, and may be 100% by weight. The polymer having a methyl methacrylate unit of 100% by weight is a methyl methacrylate homopolymer obtained by polymerizing methyl methacrylate alone.

The methyl methacrylate resin can be obtained by polymerizing a monofunctional monomer containing methyl methacrylate as a main component in the presence of a radical polymerization initiator. In the polymerization, a polyfunctional monomer or a chain transfer agent may be coexistent, if necessary.

The monofunctional monomer copolymerizable with methyl methacrylate is not particularly limited, and examples thereof include ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, meta 2-ethylhexyl acrylate, and methacrylic acid esters other than methyl methacrylate such as 2-hydroxyethyl methacrylate; Acrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, benzyl acrylate, 2-ethylhexyl acrylate, and 2-hydroxyethyl acrylate; Hydroxyalkyl acrylates such as methyl 2- (hydroxymethyl) acrylate, methyl 3- (hydroxyethyl) acrylate, ethyl 2- (hydroxymethyl) acrylate and butyl 2- (hydroxymethyl) acrylate; Unsaturated acids such as methacrylic acid and acrylic acid; Halogenated styrenes such as chlorostyrene and bromostyrene; Substituted styrenes such as vinyltoluene and? -Methylstyrene; Unsaturated nitriles such as acrylonitrile and methacrylonitrile; Unsaturated acid anhydrides such as maleic anhydride and citraconic anhydride; And unsaturated imides such as phenylmaleimide and cyclohexylmaleimide. These monomers may be used singly or in combination of two or more kinds.

Examples of the polyfunctional monomer that can be copolymerized with methyl methacrylate include, but are not limited to, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di Terminal hydroxyl groups of ethylene glycol or an oligomer thereof such as ethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, nonaethylene glycol di (meth) acrylate and tetradecaethylene glycol di (meth) acrylate are reacted with acrylic acid or methacrylic acid &Lt; / RTI &gt; Propylene glycol or its oligomer with both terminal hydroxyl groups being esterified with acrylic acid or methacrylic acid; (Meth) acrylate, neopentyl glycol di (meth) acrylate, hexanediol di (meth) acrylate and butanediol di (meth) acrylate esterified with acrylic acid or methacrylic acid; Bisphenol A, an alkylene oxide adduct of bisphenol A, or both terminal hydroxyl groups of the halogen substituents thereof esterified with acrylic acid or methacrylic acid; Trimethylol propane and pentaerythritol esterified with acrylic acid or methacrylic acid, and epoxy groups of glycidyl acrylate or glycidyl methacrylate added to the terminal hydroxyl groups of these polyhydric alcohols; A dibasic acid such as succinic acid, adipic acid, terephthalic acid, phthalic acid and halogen substituents thereof, and an alkylene oxide adduct thereof, and the like, in which epoxy groups of glycidyl acrylate or glycidyl methacrylate are ring- Allyl (meth) acrylate; And aromatic divinyl compounds such as divinylbenzene. Among them, ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate and neopentyl glycol dimethacrylate are preferably used.

The methacrylic acid-based resin may also be one which has undergone a reaction between the functional groups copolymerized with the resin and modified. Examples of the reaction include a condensation reaction in a polymer chain of a methyl ester group of methyl acrylate and a hydroxyl group of 2- (hydroxymethyl) acrylate or a condensation reaction of a carboxyl group of acrylic acid with a hydroxyl group of 2- (hydroxymethyl) A dehydration condensation reaction in a polymer chain, and the like.

The polyethylene terephthalate resin means a resin in which 80 mol% or more of the repeating units are composed of ethylene terephthalate, and may contain other dicarboxylic acid component and diol component. Examples of other dicarboxylic acid components include, but are not limited to, isophthalic acid, 4,4'-dicarboxydiphenyl, 4,4'-dicarboxybenzophenone, bis (4-carboxyphenyl) Sebacic acid, 1,4-dicarboxycyclohexane, and the like.

Other diol components include, but are not limited to, propylene glycol, butanediol, neopentyl glycol, diethylene glycol, cyclohexanediol, ethylene oxide adduct of bisphenol A, polyethylene glycol, polypropylene glycol and polytetramethylene glycol .

These dicarboxylic acid components and diol components may be used in combination of two or more kinds, if necessary. In addition, hydroxycarboxylic acids such as p-hydroxybenzoic acid and p-beta-hydroxyethoxybenzoic acid may be used in combination. As the other copolymerization component, a dicarboxylic acid component or a diol component containing a small amount of an amide bond, a urethane bond, an ether bond or a carbonate bond may be used.

The polyethylene terephthalate resin can be produced by directly polycondensation of terephthalic acid and ethylene glycol (and, if necessary, other dicarboxylic acids or other diols), dialkyl esters of terephthalic acid and ethylene glycol (and optionally A dialkyl ester of a dicarboxylic acid or other diol), followed by polycondensation, and a method in which an ethylene glycol ester (and optionally other diol ester) of terephthalic acid (and optionally other dicarboxylic acid) And polycondensation in the presence of a catalyst. Further, if necessary, solid phase polymerization may be carried out to improve the molecular weight or lower the low molecular weight component.

The cyclic polyolefin-based resin is obtained by polymerizing a cyclic olefin monomer such as norbornene and other cyclopentadiene derivatives in the presence of a catalyst. Use of such a cyclic polyolefin-based resin is preferable because a protective film having a predetermined retardation value, which will be described later, can be easily obtained.

As the cyclic polyolefin-based resin, ring-opening metathesis polymerization is carried out, for example, from cyclopentadiene and olefins or (meth) acrylic acid or its esters using norbornene or a derivative thereof obtained by the Diels-Alder reaction as a monomer, A resin obtained by subsequent hydrogenation; A ring-opening metathesis polymerization is carried out with dicyclopentadiene and tetracyclododecene or a derivative thereof obtained by the Diels-Alder reaction from olefins or (meth) acrylic acid or esters thereof as a monomer, and a resin obtained by subsequent hydrogenation ; A resin obtained by ring-opening metathesis copolymerization of at least two kinds of monomers selected from norbornene, tetracyclododecene, derivatives thereof, and other cyclic olefin monomers, followed by hydrogenation; And resins obtained by addition-copolymerizing an aromatic compound having a chain type olefin and / or vinyl group with a cyclic olefin such as norbornene, tetracyclododecene, or a derivative thereof.

Typical examples of the chain-like polyolefin-based resin are a polyethylene-based resin and a polypropylene-based resin. Among them, a copolymer obtained by copolymerizing propylene homopolymer or propylene as a main component and a comonomer copolymerizable therewith, for example, ethylene at a ratio of 1 to 20% by weight, preferably 3 to 10% by weight, is suitably used.

The polypropylene resin may contain an alicyclic saturated hydrocarbon resin. By containing an alicyclic saturated hydrocarbon resin, it becomes easy to control the retardation value. The content of the alicyclic saturated hydrocarbon resin is preferably from 0.1 to 30% by weight based on the polypropylene-based resin, more preferably from 3 to 20% by weight. If the content of the alicyclic saturated hydrocarbon resin is less than 0.1% by weight, the effect of controlling the retardation value is not sufficiently obtained. If the content of the alicyclic saturated hydrocarbon resin exceeds 30% by weight, the bleeding of the alicyclic saturated hydrocarbon resin There is a possibility of out.

The cellulose-based resin is a resin in which part or all of the hydrogen atoms in the hydroxyl group of the cellulose obtained from the raw cellulose such as cotton linters and wood pulp (hardwood pulp, softwood pulp) and the like are substituted with an acetyl group, a propionyl group and / Cellulosic organic acid ester or cellulose mixed organic acid ester. Examples thereof include acetate esters of cellulose, propionic acid esters, butyric acid esters, and mixed esters thereof. Among them, triacetylcellulose film, diacetylcellulose film, cellulose acetate propionate film and cellulose acetate butyrate film are preferable.

The method of forming a protective film for bonding a polymethyl methacrylate-based resin, a polyethylene terephthalate-based resin, a polyolefin-based resin, and a cellulose-based resin to a polarizer may be appropriately selected depending on the respective resins and is particularly limited It is not. For example, a solvent casting method in which a resin dissolved in a solvent is plied with a metal band or a drum and the solvent is removed by drying to obtain a film, and a method in which a resin is heated and kneaded at a temperature above its melting temperature, Melt extrusion method is employed. In this melt extrusion method, the single layer film may be extruded, or the multilayer film may be extruded simultaneously.

As the film to be used as a protective film, commercially available products can be easily obtained. As the methacrylic acid-based resin film, trade names of Sumipex (manufactured by Sumitomo Chemical Co., Ltd.) and acrylite (Manufactured by Mitsubishi Rayon Co., Ltd.), DERAGRAS (registered trademark) (manufactured by Asahi Kasei Corporation), Paragraph (registered trademark), COMOGRAS (registered trademark) (registered trademark) (Trade name, manufactured by Kuraray Co., Ltd.), and ARCRORE (registered trademark) (manufactured by Nippon Shokubai Kabushiki Kaisha). As the polyolefin-based resin film, trade names such as Zeonoa (registered trademark) (Nippon Zeon) and ATON (registered trademark) (JSR Corp.) are listed. Examples of the polyethylene terephthalate-based resin film include Nova Clear (registered trademark) (Mitsubishi Chemical Corporation) and Deijin A-PET sheet (manufactured by Daikin Kasei Kabushiki Kaisha) under trade names. Examples of the polypropylene resin film include FILMAX CPP film (manufactured by FILMAX Corporation), Suntox (registered trademark) (manufactured by TOKYO TOXOS K.K.), TOCELLO (registered trademark) manufactured by TOCELLO KABUSHIKI KAISHA, (Trade name) manufactured by Toyo Boseki Kabushiki Kaisha), DOREPAN (registered trademark) (manufactured by Toray Film Household Co., Ltd.), Nippon Poly Ace (manufactured by Nippon Polyacetal Co., Ltd.) And Taikou (registered trademark) FC (manufactured by Futamura Chemical Co., Ltd.). Examples of the cellulose-based resin film include Fujisack (registered trademark) TD (manufactured by Fuji Film Co., Ltd.), KC2UA and Konica Minolta TAC film KC (manufactured by Konica Minolta Kabushiki Kaisha) .

The protective film used in the present invention may be imparted with a haze value. The method of imparting antifogging properties is not particularly limited. For example, a method of mixing inorganic fine particles or organic fine particles into the raw material resin and filming them, and a method of using the multilayer extrusion, A method of forming a double-layered film with a resin in which fine particles are not mixed, a method of forming a three-layered film outwardly of a resin mixed with particles, and a method of coating a coating liquid comprising a mixture of inorganic fine particles or organic fine particles in a curable binder resin And the binder resin is cured to form an antiglare layer.

Further, the protective film may contain an additive agent, if necessary. Examples of additives include lubricants, antiblocking agents, heat stabilizers, antioxidants, light stabilizers, and impact resistance improvers.

The thickness of the protective film is usually about 1 to 50 mu m, preferably 10 to 40 mu m, and more preferably 10 to 30 mu m in view of strength and handleability.

The protective film is preferably subjected to saponification treatment, corona treatment, plasma treatment or the like prior to bonding with the polarizer.

A brightness enhancement film may be used as the protective film. The thickness of the brightness enhancement film is preferably 35 占 퐉 or less, more preferably 30 占 퐉 or less.

As the brightness enhancement film, a polarization conversion element having a function of separating outgoing light from a light source (backlight) into transmission polarized light and reflected polarized light or scattered polarized light is used. Such a brightness enhancement film can improve the emission efficiency of linearly polarized light by using recycled light from a backlight of reflected polarized light or scattered polarized light.

Examples of the brightness enhancement film include anisotropic reflective polarizers. The anisotropic reflective polarizer is an anisotropic multi-layer film that transmits linearly polarized light in one vibration direction and reflects linearly polarized light in the other vibration direction. Examples of the anisotropic multi-layer film include a trade name "APF " manufactured by 3M Company. The anisotropic reflective polarizer may be a composite of a cholesteric liquid crystal layer and a? / 4 plate. As such a composite, a trade name "PCF ", manufactured by Nitto Denko Corporation, may be mentioned. As the anisotropic reflective polarizer, a reflective grid polarizer can be mentioned. As the reflective grid polarizer, a metal lattice reflective polarizer capable of generating a reflective polarized light in a visible light region by micro-machining a metal can be mentioned. Among them, a brightness enhancement film made of an anisotropic multi-layer film is preferable.

Examples of the cured layer of the active energy ray-curable resin composition include a layer that is cured by irradiating the active energy ray-curable resin composition with active energy rays. Examples of the active energy ray curable resin composition include a polymerizable compound and a photopolymerization initiator, a photoreactive resin, a binder resin, and a photoreactive crosslinking agent. Examples of the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, a photocurable urethane monomer, and oligomers derived from a photopolymerizable monomer. Examples of the photopolymerization initiator include those which generate active species such as radicals, cations or anions by irradiation with active energy rays such as ultraviolet rays. As the active energy ray curable resin composition comprising a polymerizable compound and a photopolymerization initiator, those containing a photocurable epoxy monomer and a photocationic polymerization initiator can be preferably used.

When the active energy ray-curable resin composition is used, the active energy ray-curable resin composition is coated on the polarizer or protective film, followed by drying if necessary, and then the active energy rays are irradiated, Is cured. Although a light source of an active energy ray is not particularly limited, ultraviolet rays having a light emission distribution at a wavelength of 400 nm or less are preferable, and specifically, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, a high pressure mercury lamp, A mercury lamp, a metal halide lamp, or the like can be used.

The composition may contain an additive. Examples of the additive include an ion trap agent, an antioxidant, a chain transfer agent, a sensitizer, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer and a defoaming agent.

The cured layer of the active energy ray-curable resin composition is useful as a protective layer for protecting the surface of the polarizer. The cured layer of the active energy ray-curable resin composition can be made thinner than an ordinary protective film, and thus is effective for thinning the polarizing plate.

The thickness of the cured layer of the active energy ray-curable resin composition is preferably 0.01 to 20 占 퐉, more preferably 0.01 to 10 占 퐉, and still more preferably 0.01 to 5 占 퐉.

(First transparent resin layer)

The first transparent resin layer has a surface resistance value of 1.0 10 ⁹ ? /? And 1.0 10 ¹¹ ? /?, Preferably 5.0 10 ⁹ ? / 5.0 5.0 10 ¹⁰ ? /? . With this surface resistance value and the second transparent resin layer having the antistatic function, it is possible to efficiently manufacture the liquid crystal display device without causing multiple ejection or product defects. The surface resistance value can be measured by the method described in the following Examples.

The first transparent resin layer can be formed of, for example, an optical layer such as a hard coat layer, an antiglare layer, a light diffusion layer, an antireflection layer, or an adhesive layer. Among them, the first transparent resin layer is preferably a hard coat layer. In order to impart the surface resistance characteristic to the first transparent resin layer, for example, an antistatic agent may be contained in the first transparent resin layer. In this specification, the term "transparent" means that the single light transmittance is 80% or more in the visible light region.

The hard coat layer can be formed by coating an active energy ray-curable resin composition on a transparent resin film, and then curing the coating layer by irradiating an active energy ray. When a photocurable resin or the like is used as the active energy ray curable resin, a photopolymerization initiator is usually contained in the coating liquid. The photopolymerization initiator is appropriately selected according to the resin to be used, and examples thereof include an acetophenone photopolymerization initiator, a benzoin photopolymerization initiator, a benzophenone photopolymerization initiator, a thioxanthone photopolymerization initiator, a triazine photopolymerization initiator, an oxadiazole photopolymerization initiator . The coating liquid may contain other additives such as a solvent such as an organic solvent, a leveling agent, a dispersant, and an antifouling agent.

The coating method of the coating liquid can be carried out by a known method such as a gravure coating method, a micro gravure coating method, a roll coating method, a rod coating method, a knife coating method, an air knife coating method, a kiss coating method, .

The active energy ray to be irradiated can be appropriately selected from ultraviolet ray, electron ray, near ultraviolet ray, visible ray, near-infrared ray, infrared ray and X ray depending on the kind of the active energy ray curable resin, but ultraviolet ray or electron ray is preferable, And ultraviolet rays are preferable in that high energy is easily obtained.

The antiglare layer is an optical functional layer provided with a predetermined concavo-convex shape on its surface for preventing external light from entering. The antiglare layer can be formed, for example, by (a) coating a coating liquid containing transparent microfine particles and a light-transmitting resin on a transparent resin film, and then curing the coating layer as necessary (surface unevenness due to light- ), (B) a coating liquid containing a light-transmitting resin (which may further contain light-transmitting fine particles) is coated on a transparent resin film, and then a mold having a predetermined surface relief shape is pressed against the coating layer to form a coating layer And then the surface of the coating layer is subjected to surface irregularities.

The translucent resin constituting the antiglare layer is not particularly limited as long as it has translucency. For example, in addition to the above-mentioned curing agent of active energy ray-curable resin, a cured product of a thermosetting resin; Thermoplastic resin; A metal alkoxide-based polymer, and the like. Among them, a cured product of an active energy ray-curable resin is suitable. When an ultraviolet ray-curable resin or the like is used as the active energy ray-curable resin, a photopolymerization initiator (radical polymerization initiator) is contained in the coating liquid and the active energy ray is irradiated to cure the coating layer.

Examples of the thermosetting resin include a thermosetting urethane resin composed of an acrylic polyol and an isocyanate prepolymer, a phenol resin, a urea melamine resin, an epoxy resin, an unsaturated polyester resin, and a silicone resin.

Examples of the thermoplastic resin include cellulose derivatives such as acetylcellulose, nitrocellulose, acetylbutylcellulose, ethylcellulose, and methylcellulose; Vinyl resins such as vinyl acetate and its copolymers, vinyl chloride and its copolymers, vinylidene chloride and copolymers thereof; Acetal resins such as polyvinyl formal, polyvinyl butyral and the like; (Meth) acrylic resins such as acrylic resins and copolymers thereof, methacrylic resins and copolymers thereof; Polystyrene type resin; Polyamide based resin; Polyester-based resin; And polycarbonate-based resins.

As the metal alkoxide-based polymer, a silicon oxide-based matrix using a silicon alkoxide-based material as a raw material can be used. Specifically, the metal alkoxide polymer may be an inorganic or organic-inorganic composite matrix obtained by dehydration condensation of a hydrolyzate of an alkoxysilane such as tetramethoxysilane or tetraethoxysilane.

When a cured product of a thermosetting resin or a metal alkoxide-based polymer is used as the light transmitting resin, heating may be required after coating the coating solution.

Examples of the light transmitting fine particles include organic fine particles such as (meth) acrylic resin, melamine resin, polyethylene, polystyrene, organic silicone resin and acryl-styrene copolymer, and organic fine particles such as calcium carbonate, silica, aluminum oxide, Barium, titanium oxide, glass, and the like. As the light transmitting fine particles, one kind or two or more kinds of fine particles may be used. The kind of the light-transmitting fine particles, the particle size, the refractive index, the content, and the like are suitably adjusted in order to obtain desired antiglare property and other optical properties.

The light-diffusing layer is an optical functional layer for diffusing backlight having passed through the liquid crystal cell for the purpose of enlarging the viewing angle of the liquid crystal display device. The light-diffusing layer can be formed, for example, by coating a coating liquid containing transparent fine particles (light diffusing agent) and a light-transmitting resin on a transparent resin film, and then curing the coating layer as necessary. As the translucent fine particles and the translucent resin, the same materials as described for the antiglare layer can be used.

The kind of the transparent resin film, the type of the light transmitting resin, the kind of the light transmitting fine particles, the particle diameter, the refractive index, the content, the thickness of the light diffusion layer and the like are appropriately adjusted in order to obtain the desired light diffusibility.

The antireflection layer is an optical functional layer for reducing or preventing reflection of external light, and may be provided with, for example, a low refractive index layer. Further, a multi-layer structure may be further provided with a high refractive index layer and / or a medium refractive index layer between the transparent resin film and the low refractive index layer. The aforementioned hard coat layer may be formed between the antireflection layer and the transparent resin film.

The low refractive index layer is formed by coating a coating liquid containing a cured product of the above-mentioned active energy ray-curable resin, a light transmitting resin such as a metal alkoxide polymer and inorganic fine particles, and then curing the coating layer as necessary . The inorganic fine particles include, for example, low refractive index, such as LiF (refractive index 1.4), MgF (refractive index 1.4), 3NaF and AlF (refractive index 1.4), AlF (refractive index 1.4), Na ₃ AlF ₆ (refractive index 1.33) fine particles and, Hollow silica fine particles and the like.

The high refractive index layer is formed by coating a cured product of the above-mentioned active energy ray-curable resin or a light transmitting resin such as a metal alkoxide polymer and a coating liquid containing inorganic fine particles and / or organic fine particles and then curing the coating layer Method. Examples of the inorganic fine particles include zinc oxide, titanium oxide, cerium oxide, aluminum oxide, silicate oxide, tantalum oxide, yttrium oxide, ytterbium oxide, zirconium oxide, antimony oxide, indium tin oxide (ITO) . By forming such a high refractive index layer, antistatic performance can be imparted.

As the pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer, for example, an acrylic polymer, a silicone-based polymer, a polyester, a polyurethane, a polyamide, a polyvinyl ether, a vinyl acetate / vinyl chloride copolymer, a modified polyolefin, A rubber such as rubber may be suitably selected and used as a base polymer. The pressure-sensitive adhesive is preferably excellent in optical transparency, exhibits appropriate wettability, cohesiveness and adhesive property, and is excellent in weather resistance and heat resistance.

Examples of the antistatic agent that may be contained in the first transparent resin layer include an alkali metal salt and / or an organic cation-anionic salt. As the alkali metal salt, an organic salt and an inorganic salt of an alkali metal can be used. The term &quot; organic cation-anionic salt &quot; in the present invention means an organic salt, and the cation part thereof is composed of an organic material, and the anion part may be an organic material or an inorganic material. The "organic cation-anionic salt" is also referred to as an ionic liquid or an ionic solid. One type of antistatic agent may be used alone, or a plurality of types of antistatic agents may be used in combination.

Examples of the alkali metal ion constituting the cation portion of the alkali metal salt include ions of lithium, sodium and potassium. Of these alkali metal ions, lithium ions are preferable.

The anion portion of the alkali metal salt may be composed of an organic material or may be composed of an inorganic material. Anion portion constituting the organic salt is, for example, ^{_{CH 3 COO -, CF 3 COO}} -, CH 3 SO 3 -, CF 3 SO 3 -, (CF 3 SO 2) 3 C -, C 4 F 9 SO 3 -, ^{_{C 3 F 7 COO -, (}} CF 3 SO 2) (CF 3 CO) N -, - O 3 S (CF 2) 3 SO 3 -, PF 6 -, CO 3 2- or the following general formula (1) to ( 4),

(1): (C _n F _{2n + 1} SO ₂ ) ₂ N ^- (wherein n is an integer of 1 to 10)

(2): CF ₂ (C _m F _{2 m} SO ₂ ) ₂ N ^- (wherein m is an integer of 1 to 10)

(3): ^- O ₃ S (CF ₂ ) ₁ SO ₃ ^- (wherein 1 is an integer of 1 to 10)

(C _p F _{2p + 1} SO ₂ ) N ^- (C _q F _{2q + 1} SO ₂ ) (wherein p and q are integers of 1 to 10)

And the like are used. Particularly, the anion portion containing a fluorine atom is preferably used because an ionic compound having good ion dissociability is obtained. Examples of the anion moiety constituting the inorganic salt include Cl ^- , Br ^- , I ^- , AlCl ₄ ^- , Al ₂ Cl ₇ ^- , BF ₄ ^- , PF ₆ ^- , ClO ₄ ^- , NO ₃ ^- , AsF ₆ ^- , SbF ₆ ^- , NbF ₆ ^- , TaF ₆ ^- , (CN) ₂ N ^-, and the like. The anion moiety is preferably a (perfluoroalkylsulfonyl) imide represented by the above formula (1) such as (CF ₃ SO ₂ ) ₂ N ^- or (C ₂ F ₅ SO ₂ ) ₂ N ^- (Trifluoromethanesulfonyl) imide represented by CF ₃ SO ₂ ) ₂ N ^- is preferable.

The organic cation-anionic salt used in the present invention is composed of a cation component and an anion component, and the cation component is composed of an organic substance. Specific examples of the cation component include a pyridinium cation, a piperidinium cation, a pyrrolidinium cation, a cation having a pyrrolene skeleton, a cation having a pyrrole skeleton, an imidazolium cation, a tetrahydropyrimidinium cation, A cyanide cation, a sodium ion cation, a sodium ion cation, a sodium ion cation, a sodium ion cation, a sodium ion cation, a sodium ion cation, a sodium ion cation, a sodium ion cation, a pyrazolium cation,

Examples of the anion component include Cl ^- , Br ^- , I ^- , AlCl ₄ ^- , Al ₂ Cl ₇ ^- , BF ₄ ^- , PF ₆ ^- , ClO ₄ ^- , NO ₃ ^- , CH ₃ COO ^- , CF ₃ COO _{^{-, CH 3 SO 3 -,}} CF 3 SO 3 -, (CF 3 SO 2) 3 C -, AsF 6 -, SbF 6 -, NbF 6 -, TaF 6 -, (CN) 2 N -, C 4 F _{^{9 SO 3 -, C 3 F}} 7 COO -, ((CF 3 SO 2) (CF 3 CO) N -, - O 3 S (CF 2) 3 SO 3 - to or formula (1) to (4),

(1): (C _n F _{2n + 1} SO ₂ ) ₂ N ^- (wherein n is an integer of 1 to 10)

(2): CF ₂ (C _m F _{2 m} SO ₂ ) ₂ N ^- (wherein m is an integer of 1 to 10)

(3): ^- O ₃ S (CF ₂ ) ₁ SO ₃ ^- (wherein 1 is an integer of 1 to 10)

(C _p F _{2p + 1} SO ₂ ) N ^- (C _q F _{2q + 1} SO ₂ ) (wherein p and q are integers of 1 to 10)

And the like are used. Particularly, the anion component containing a fluorine atom is preferably used because an ionic compound having good ion dissociability is obtained.

The antistatic agent is preferably 1 part by mass or more and 50 parts by mass or less, more preferably 3 parts by mass or more, from the viewpoint of easily imparting the surface resistance characteristics to 100 parts by mass of the first transparent resin layer.

The thickness of the first transparent resin layer is preferably 0.01 to 20 탆, more preferably 0.01 to 5 탆.

(Second transparent resin layer)

The second transparent resin layer is a layer having an antistatic function. Since the second transparent resin layer has an antistatic function and the first transparent resin layer has a predetermined surface resistance value, the liquid crystal display device can be efficiently manufactured without causing multiple ejection or product defects.

The second transparent resin layer can be formed of, for example, an optical layer such as a hard coat layer, an antiglare layer, a light diffusion layer, an antireflection layer, or an adhesive layer. Above all, the first transparent resin layer is preferably a pressure-sensitive adhesive layer. When the second transparent resin layer is a pressure-sensitive adhesive layer, it may be a pressure-sensitive adhesive layer for bonding the second transparent resin layer to the liquid crystal cell.

In order to impart an antistatic function to the second transparent resin layer, for example, an antistatic agent may be contained in the second transparent resin layer. That is, when the second transparent resin layer contains an antistatic agent, the second transparent resin layer can be said to have an antistatic function. As the method for forming the second transparent resin layer, the same method as the method for forming the first transparent resin layer can be adopted. The first transparent resin layer and the second transparent resin layer may be formed of the same layer, but are preferably formed of different layers.

The thickness of the second transparent resin layer is preferably 0.1 to 40 탆, more preferably 5 to 30 탆.

(Production method of polarizing plate)

The above-described members can be bonded to each other, for example, by laminating them through an adhesive layer or a pressure-sensitive adhesive layer.

The adhesive layer is, for example, a layer for bonding a polarizer and a protective film. Examples of the adhesive forming the adhesive layer include an active energy ray curable adhesive and an aqueous adhesive. The above-mentioned active energy ray-curable resin composition may also be used.

In the case of using the water-based adhesive, it is preferable to carry out a step of bonding the polarizer and the protective film, followed by drying to remove water contained in the water-based adhesive. After the drying step, a curing step may be provided for curing at a temperature of, for example, 20 to 45 ° C.

In the case of using an active energy ray-curable adhesive, a curing step of curing the active energy ray-curable adhesive is carried out by bonding a polarizer and a protective film, then performing a drying step if necessary, and then irradiating with an active energy ray. Although a light source of an active energy ray is not particularly limited, ultraviolet rays having a light emission distribution at a wavelength of 400 nm or less are preferable, and specifically, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, a high pressure mercury lamp, A mercury lamp, a metal halide lamp, or the like can be used.

In joining the polarizer and the protective film, saponification treatment, corona treatment, plasma treatment, or the like can be performed on at least one of the bonding surfaces.

A pressure-sensitive adhesive layer can be used for the lamination of the polarizer and the protective film or for the bonding of the optical laminate to the liquid crystal cell. Examples of the pressure-sensitive adhesive layer include acrylic pressure-sensitive adhesives, silicone pressure-sensitive adhesives, and rubber pressure-sensitive adhesives. Acrylic pressure-sensitive adhesives are preferred from the viewpoints of transparency, weather resistance, heat resistance and workability. When the pressure-sensitive adhesive layer is a layer corresponding to the second transparent resin layer, the pressure-sensitive adhesive layer has an antistatic function and preferably has an antistatic agent.

As the pressure-sensitive adhesive, various additives such as a filler, a pigment, a colorant, a filler, an antioxidant, an ultraviolet absorber, a silane coupling agent and the like which are composed of a tackifier, a plasticizer, a glass fiber, a glass bead, a metal powder, May be appropriately blended.

The pressure-sensitive adhesive layer is usually formed by applying a solution of a pressure-sensitive adhesive on a release sheet and drying it. The application to the release sheet may be carried out by a roll coating method such as reverse coating or gravure coating, a spin coating method, a screen coating method, a fountain coating method, a dipping method, a spraying method, or the like. The release sheet on which the pressure-sensitive adhesive layer is formed is used by a method of transferring the release sheet.

The thickness of the pressure-sensitive adhesive layer disposed between the polarizer and the protective film (in particular, the brightness enhancement film) may be, for example, 3 to 15 탆. The thickness of the pressure-sensitive adhesive layer for bonding the optical laminate to the liquid crystal cell may be, for example, 5 to 30 占 퐉.

<Liquid Crystal Display Device>

2 is a schematic cross-sectional view showing an example of the layer structure of the liquid crystal display device of the present invention. In Fig. 2, the backlight and the polarizing plate on the back side are omitted. 2 (a), the front plate 2, the adhesive layer 30, the polarizing plate 100, and the liquid crystal cell 3 are stacked in this order. In the liquid crystal display device of the present invention shown in FIG. 2 (b), the front plate 2, the adhesive layer 30, the polarizing plate 101, and the liquid crystal cell 3 are stacked in this order. 2 (c), the front plate 2, the adhesive layer 30, the polarizing plate 102, and the liquid crystal cell 3 are stacked in this order. Alternatively, the air layer may be formed without forming the adhesive layer 30. In the liquid crystal display device of the present invention, it is preferable that the polarizing plate of the present invention is laminated on the liquid crystal cell so that the first transparent resin layer is closer to the viewer side than the second transparent resin layer.

The liquid crystal display device according to the present invention is preferably a touch input type liquid crystal display device having a touch panel function. The touch input type liquid crystal display device includes a touch input device including a liquid crystal cell. The configuration of the touch panel may be any conventionally known method such as an out-cell type, an on-cell type, an in-cell type, and the like, but it is preferably an in-cell type. Further, the operation method of the touch panel may be any conventionally known method such as a resistance film type, a capacitance type (surface type capacitance type, projection type capacitance type), or the like.

The liquid crystal cell 50 has a pair of transparent substrates and a liquid crystal layer sandwiched therebetween. The display mode of the liquid crystal cell may be various display modes such as STN, TN, OCB, HAN, VA, and IPS. From the viewpoint of obtaining a high contrast, the VA mode is preferable, and from the viewpoint of obtaining a wide viewing angle, the IPS mode is preferable.

Since the front panel is disposed on the visual side of the liquid crystal cell, specifically, on the outermost surface of the final product as described above, it is assumed that the front panel is used outdoors or outdoors. Therefore, from the viewpoint of durability, it is preferable to be composed of an inorganic material such as glass and tempered glass, an organic material such as polycarbonate resin, acrylic resin, or the like.

The adhesive layer for bonding the front plate and the polarizing plate of the present invention preferably has a refractive index close to that of the front plate. As the adhesive layer, the adhesive layer or the pressure-sensitive adhesive layer may be used. By stacking the polarizing plate and the front plate through the adhesive layer, reflection and light scattering at the interface between the front plate and the polarizing plate can be eliminated, and visibility can be improved.

[Example]

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited by these examples. In the examples, "%" and "part" indicating the content or amount are based on mass unless otherwise specified. The evaluation method used in the examples is as follows.

(1) Thickness:

Using a digital micrometer MH-15M manufactured by Nikon Corporation.

(2) Surface resistance:

The surface resistance value (Ω / □) of the surface of the first transparent resin layer was measured using MCP-HT450 manufactured by Mitsubishi Chemical Corporation.

(3) Evaluation of occurrence of multiple take-out by static electricity after chip cutting:

The polarizers obtained in Examples and Comparative Examples were chip-cut into a 5.5-inch diagonal size, and after folding into 100 sheets, the number of times of multiple take-out occurred when inspecting each product one by one was counted. The evaluation criteria are as follows.

○: Number of occurrences 0

Δ: Number of occurrences is 1 or more, 10 or less

×: Occurrence frequency exceeded 10 times

(4) Touch panel operability evaluation:

A polarizing plate on the viewer's side was peeled off from a liquid crystal display with an in-cell type touch sensor of Galaxy (registered trademark) On7 manufactured by Samsung Electronics Co., Ltd. After the pressure-sensitive adhesive polarizing plate obtained in each example was bonded and autoclaved, the operability of the touch panel was confirmed. The evaluation criteria are as follows.

○: No problem with touch panel operability

×: Malfunction occurred when operating the touch panel

(5) ESD test evaluation:

The cover glass and the polarizing plate on the viewing side were peeled off from the liquid crystal panel (liquid crystal display with an in-cell type touch sensor of Samsung Galaxy (registered trademark) On7), and the polarizing plates with the adhesive prepared in Examples and Comparative Examples were peeled off Junction. Further, the front plate was joined to obtain an evaluation sample.

The evaluation sample was placed on a backlight having a luminance of 20000 cd, and static electricity of 6 kv was generated by using ESD (ESD-8012A, manufactured by SANKI), which is a static electricity generator, to cause alignment disorder of the liquid crystal. The recovery time (s) of defective display due to the orientation defect was measured using an instantaneous multi-photometer (MCPD-3000, Otsuka Denshi Co., Ltd.).

(6) Heat resistance durability test Evaluation:

The polarizing plate with a pressure-sensitive adhesive obtained in the Examples and Comparative Examples was cut to a size of 40 mm in length and 40 mm in width and pressed onto an alkali-free glass through a pressure-sensitive adhesive layer and allowed to stand in an autoclave at 50 캜 under a load of 5 kg for 20 minutes The adhered state was aged and left for 10 hours under an environment of 23 占 폚 / 60% RH. Thereafter, the durability test was carried out using an Espec thermo-hygrostat for 500 hours in an environment of 85 ° C. dry, and evaluated as to whether or not it was peeled off visually immediately after removal.

○: No peeling was observed at all.

△: A small peeling which can be confirmed by the naked eye was seen.

X: Apparent peeling was confirmed.

(Production Example 1: Production of Polarizer A)

A polyvinyl alcohol film (average degree of polymerization of about 2,400, degree of saponification of 99.9 mol% or more) having a thickness of 20 占 퐉 was uniaxially stretched by about 5 times by dry stretching and immersed in pure water at 60 占 폚 for one minute And then immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 at 28 ° C for 60 seconds. Thereafter, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 at 72 ° C for 300 seconds. Subsequently, the film was washed with pure water at 26 DEG C for 20 seconds, and then dried at 65 DEG C to obtain a polarizer having a thickness of 9 mu m in which iodine was adsorbed and oriented in a polyvinyl alcohol film.

(Production Example 2: Production of Polarizer B)

A polyvinyl alcohol film (average degree of polymerization of about 2,400, degree of saponification of 99.9 mol% or more) having a thickness of 30 占 퐉 was uniaxially stretched by about 4 times by dry stretching and immersed in pure water at 60 占 폚 for one minute And then immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 at 28 ° C for 60 seconds. Thereafter, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 at 72 ° C for 300 seconds. Subsequently, the film was washed with pure water at 26 DEG C for 20 seconds, and then dried at 65 DEG C to obtain a polarizer having a thickness of 12 mu m in which iodine was adsorbed and oriented in a polyvinyl alcohol film.

(Production Example 3: Production of Polarizer C)

A polyvinyl alcohol film (average degree of polymerization of about 2,400, degree of saponification of 99.9 mol% or more) having a thickness of 75 탆 was uniaxially stretched by about 4 times by dry stretching and immersed in pure water at 60 캜 for one minute And then immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 at 28 ° C for 60 seconds. Thereafter, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 at 72 ° C for 300 seconds. Subsequently, the film was washed with pure water at 26 DEG C for 20 seconds, and then dried at 65 DEG C to obtain a polarizer having a thickness of 28 mu m in which iodine was adsorbed and oriented in a polyvinyl alcohol film.

(Production Example 4: Production of aqueous adhesive)

3 parts by weight of a carboxyl group-modified polyvinyl alcohol (trade name "KL-318" available from Kabushiki Kaisha Kurara Co., Ltd.) was dissolved in 100 parts by weight of water. To the aqueous solution was added a polyamide epoxy additive 1.5 parts by weight of Sumirez Resin (registered trademark) 650 (30), an aqueous solution having a solid concentration of 30% by weight, obtained from Kagaku Kogyo K.K.) were added to prepare an aqueous adhesive.

(Preparation of pressure-sensitive adhesive layer)

The following pressure-sensitive adhesive layer was prepared.

Pressure-sensitive adhesive layer A: A sheet-type pressure-sensitive adhesive ("KZ" manufactured by Lintec Corporation)

Pressure-sensitive adhesive layer B: A sheet-type pressure-sensitive adhesive having a thickness of 25 占 퐉 ("KT" manufactured by Lintec Corporation) having no antistatic function

(Preparation of protective film)

The following protective films were prepared.

Protective film A: Cellulose-based resin film KC4UA, manufactured by Konica Minolta Kabushiki Kaisha, thickness: 40 占 퐉.

Protective film B: Cellulose-based resin film KC2UA, manufactured by Konica Minolta K.K., thickness of 25 占 퐉.

Protective film C: Cellulose-based resin film KC4CT, manufactured by Konica Minolta K.K., thickness: 40 占 퐉.

Protective film D: a ring-shaped olefin resin film ZF14-023, manufactured by Nippon Zeon Co., Ltd., thickness 23 탆.

Protective film E: a ring-shaped olefin resin film ZF14-013, manufactured by Nippon Zeon Co., Ltd., thickness: 13 占 퐉.

Protective film F: cured layer of active energy ray-curable resin composition, thickness 3 占 퐉.

[Example 1]

An aqueous adhesive was applied to both sides of the polarizer B, and the protective film A and the protective film D were bonded to each other to obtain a polarizing plate comprising the protective film A / water-based adhesive layer / polarizer / aqueous adhesive layer / protective film D. Next, a composition including a clear hard coat resin overlaid with an antistatic agent was applied on the protective film A and cured by irradiation with ultraviolet rays to form a hard coat layer (first transparent resin layer) having antistatic function. Further, a pressure-sensitive adhesive layer A (second transparent resin layer) was bonded to the protective film D to obtain a polarizer with a pressure-sensitive adhesive.

The surface resistance value of the first transparent resin was 5.0 × 10 ⁹ Ω / □. The distance between the hard coat layer (first transparent resin layer) and the pressure-sensitive adhesive layer A (second transparent resin layer) was 75 占 퐉.

[Examples 2 to 10 and Comparative Examples 1 to 10]

The amount of the antistatic agent put on the hard coat layer (first transparent resin layer) was adjusted to change the surface resistance value as shown in Table 1, and the kind of the protective film bonded to both surfaces of the polarizer was changed as shown in Table 1 , The kind of the pressure-sensitive adhesive layer was changed as shown in Table 1, and the kind of the polarizer was changed as shown in Table 1, and the same operations as in Example 1 were carried out to produce a polarizer with a pressure-sensitive adhesive.

When the cured layer of the active energy ray-curable resin composition was used as the protective film F, the active energy ray-curable resin composition was coated on the polarizer so that the thickness after curing became 3 占 퐉 and then irradiated with ultraviolet rays to form a cured layer . In Comparative Example 10, the hard coat layer (first transparent resin layer) was not overlaid with an antistatic agent.

With respect to these polarizers with a pressure-sensitive adhesive, the surface resistance values of the hard-coat layers were measured in the same manner as in Example 1. Table 1 summarizes the layer construction of the polarizing plate, the surface resistance of the hard coat layer, the presence or absence of the antistatic function of the pressure-sensitive adhesive layer, and the distance between the hard coat layer and the pressure-sensitive adhesive layer in Examples 1 to 10 and Comparative Examples 1 to 10 did.

Evaluation of occurrence of multiple extractions by static electricity after chip cutting, evaluation of touch panel operability, evaluation of ESD test, and evaluation of heat resistance durability test were carried out on the polarizer with a pressure sensitive adhesive prepared in Examples 1 to 10 and Comparative Examples 1 to 10. Table 2 shows the above results.

In Table 2, the judgment is X when there is a problem in the multi-take-out occurrence evaluation by electrostatic force after chip cutting, the touch panel operability evaluation, and the ESD test evaluation, Regarding the evaluation of the ESD test, it was determined that there was no problem when the recovery time was less than 1 s, and that there was a problem when the recovery time was more than 1 s.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a polarizing plate capable of efficiently producing a liquid crystal display device without causing multiple ejection or product defects, and capable of providing excellent operability of a touch panel, Do.

1: Polarizer
2: Front plate
3: liquid crystal cell
4: double arrow
10: first transparent resin layer
11: Second transparent resin layer
20, 21: protective film
30: Adhesive layer
100, 101, 102: polarizer
200, 201, 202: liquid crystal display

Claims (5)

A polarizing plate having a first transparent resin layer on one side of a polarizer and a second transparent resin layer on the other side,
Wherein the thickness of the polarizer is 15 占 퐉 or less,
Wherein the first transparent resin layer has a surface resistivity of 1.0 10 ⁹ ? /? And 1.0 10 ¹¹ ? /?
Wherein the second transparent resin layer has an antistatic function,
And the distance between the first transparent resin layer and the second transparent resin layer is 80 占 퐉 or less. The polarizing plate according to claim 1, further comprising a protective film between the first transparent resin layer or the second transparent resin layer and the polarizer. The optical film according to claim 2, wherein the protective film is at least one selected from the group consisting of a cyclic olefin resin film, a cellulose resin film, a polycarbonate resin film, a polyolefin resin film, a polyethylene terephthalate resin film, a methyl methacrylate resin film, At least one film selected from the films. The polarizing plate according to any one of claims 1 to 3, wherein the first transparent resin layer and the second transparent resin layer are respectively disposed on the outermost side of the polarizing plate. A liquid crystal display device in which the polarizing plate according to any one of claims 1 to 4 is disposed on a viewer side of a liquid crystal cell and a front plate is disposed on the polarizing plate.

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