KR20150093639A - A set of polarizer, and a liquid crystal panel and a liquid display apparatus using the set of polarizer - Google Patents

Abstract

Provided are a polarizer set, and a liquid crystal panel and a liquid display apparatus made with the set. The polarizer set for the liquid crystal panel comprises a first polarizer and a second polarizer. The first polarizer includes a first polarizing film made of a polyvinyl alcohol resin and a transparent protective film stacked on one side of the first polarizing film. The second polarizer includes a second polarizing film made of the polyvinyl alcohol resin and a second anti-glare film with a haze value in a range from 0.1% to 45% stacked on one side of the second polarizing film, wherein the second anti-glare film includes an acrylic resin film and a hard coat layer with a thickness of 2 to 30 μm stacked on the other side of the acrylic resin film opposite to the second anti-glare film side.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a polarizing plate set, a liquid crystal panel using the polarizing plate set, and a liquid crystal display using the polarizing plate set,

The present invention relates to a polarizing plate set for a liquid crystal panel, and a liquid crystal panel and a liquid crystal display using the same.

The polarizing plate is a constituent part of a liquid crystal panel which is a main component of a liquid crystal display device and is usually provided on one side or both sides of a polarizing film made of a polyvinyl alcohol resin in which a dichroic dye is adsorbed and oriented, And a transparent resin film of cellulose acetate represented by triacetyl cellulose. A liquid crystal panel is obtained by adhering it to a liquid crystal cell using a pressure-sensitive adhesive, if necessary, through another optical film.

BACKGROUND ART Liquid crystal display devices are rapidly expanding in applications as thin display screens, such as liquid crystal televisions, liquid crystal monitors, and personal computers. In particular, the market for LCD TVs is remarkable, and the demand for low cost is also very strong. As a polarizing plate for a liquid crystal television, a triacetylcellulose film (TAC film) is laminated on both sides of a polarizing film made of a conventional polyvinyl alcohol resin film by using an aqueous adhesive, and a retardation film is adhered Have been used. As a retardation film laminated on a polarizing plate, a stretched product of a polycarbonate resin film or a stretched product of a cycloolefin resin film is used. For a liquid crystal television, a retardation film made of a cycloolefin resin film having a very small retardation non- Phase difference films are widely used.

With regard to the adhered product of the polarizing plate and the retardation film made of the stretched cycloolefin resin film, reduction in the number of components and simplification of the manufacturing process have been attempted for the purpose of improving the productivity and reducing the product cost. For example, Japanese Unexamined Patent Application Publication No. 8-43812 (refer to Patent Document 1, particularly Example 4) discloses a method in which a TAC film is laminated on one side of a polarizing film, and a retardation film (Norbornene) resin film having a function as a film-forming material.

In the use of a large-screen liquid crystal television, for example, a demand for further thinning and lightening of a liquid crystal display device as a wall-mounted TV application has been surfaced. In this case, the following points become problems with respect to the liquid crystal panel and its constituent parts.

(1) When a liquid crystal panel is applied to a large-size wall-hanging TV, the chance of reaching a human hand is increased, and dust is easily attached to the liquid crystal panel. In this case, That is, the outermost surface of the polarizing plate, should not be scratched even by friction caused by the contact.

(2) It is necessary to strengthen the strength of the liquid crystal panel in correspondence with the formation of a thin and large screen of the liquid crystal panel.

(3) Thinning of the member used in response to the thinning of the liquid crystal television becomes necessary.

(4) Since the gap between the liquid crystal panel and the backlight system on the back surface is narrowed, it is necessary to prevent circularity unevenness or Newton ring caused by the contact between the liquid crystal panel and the backlight system.

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that a polarizing plate comprising a transparent protective film laminated on one side of a polarizing film made of a polyvinyl alcohol resin as a polarizing plate as a component of a liquid crystal panel, And a polarizing plate in which a retardation film having an haze value of 0.1% or more and 45% or less is laminated on one side of a polarizing film made of a polypropylene film It is possible to obtain a liquid crystal panel and a liquid crystal display device which can prevent warpage and have excellent visibility, thereby completing the present invention.

That is, according to the present invention, there is provided a polarizing plate set for a liquid crystal panel comprising a first polarizing plate and a second polarizing plate, wherein the first polarizing plate comprises a first polarizing film composed of a polyvinyl alcohol resin and a second polarizing plate laminated on one side of the first polarizing film And a transparent protective film, and the second polarizing plate comprises a second polarizing film made of a polyvinyl alcohol resin, and a retardation film laminated on one surface of the second polarizing film and having a haze value in a range of 0.1% or more and 45% Is provided. In the present invention, the light-shielding film comprises at least a second acrylic resin film.

Here, the transparent protective film in the first polarizing plate may be a stretched polyethylene terephthalate film or an acrylic resin film, and may further have an optical compensation film or a protective film laminated on a surface opposite to the surface on which the transparent protective film is laminated. The second polarizing plate may further have an optical compensation film or a protective film laminated on a surface opposite to the surface on which the retardation film is laminated in the second polarizing film.

According to the present invention, there is also provided a liquid crystal panel in which the first polarizing plate, the liquid crystal cell and the second polarizing plate are arranged in this order. In the liquid crystal panel of the present invention, the first polarizing plate is disposed so that the surface of the first polarizing film opposite to the surface on which the transparent protective film is laminated is opposed to the liquid crystal cell. The second polarizing plate is disposed such that the surface of the second polarizing film opposite to the surface on which the retardation film is laminated is opposed to the liquid crystal cell.

Further, according to the present invention, there is provided a liquid crystal display device comprising a backlight, a light diffusing plate, and a liquid crystal panel in this order, wherein the liquid crystal panel is the liquid crystal panel of the present invention. In the liquid crystal display device of the present invention, the liquid crystal panel is arranged so that the first polarizing plate faces the light diffusing plate. The liquid crystal display of the present invention may have a brightness enhancement sheet between the optical diffusing plate and the liquid crystal panel. In this case, the first polarizing plate of the liquid crystal panel is disposed so as to face the brightness enhancement sheet.

According to the specific polarizing plate set (combination) according to the present invention, the mechanical strength of the liquid crystal panel can be improved by using the stretched polyethylene terephthalate or acrylic resin film, thinning can be prevented, and scratches on the surface can be prevented. It is possible to avoid contact with the backlight system including the light diffusing plate by the light diffusing plate, and it is possible to prevent the circular irregularity and the Newton ring, thereby improving the visibility. Further, since the acrylic resin film is a film which is difficult to develop a retardation, even when a sheet or film having polarizing properties such as a luminance improving sheet is disposed between the liquid crystal panel and the backlight, It is possible to prevent problems such as color unevenness (interference non-uniformity). Such a polarizing plate set and a liquid crystal panel using the same can be suitably applied to a liquid crystal display device for a large-screen liquid crystal television, particularly a liquid crystal display device for a liquid crystal television that can be hung on a wall.

1 is a schematic sectional view showing an example of a basic layer structure of a liquid crystal display device of the present invention.
2 is a schematic sectional view showing an example of a basic layer structure of a liquid crystal display device of the present invention.

<Polarizer>

The polarizing plate set of the present invention comprises two polarizing plates of a first polarizing plate and a second polarizing plate, and these are used as constituent parts of the liquid crystal panel. The liquid crystal panel can be manufactured by laminating a first polarizing plate on one surface of a liquid crystal cell and laminating a second polarizing plate on the other surface. The first polarizing plate is used as a rear side polarizing plate of the liquid crystal panel and the second polarizing plate is used as a front side polarizing plate of the liquid crystal panel. Means a polarizing plate positioned on the backlight side when the liquid crystal panel is mounted on the liquid crystal display device and the term &quot; front-side polarizing plate &quot; means a polarizing plate positioned on the backlight side when the liquid crystal panel is mounted on the liquid crystal display device Means a polarizing plate positioned on the side of the polarizing plate. Hereinafter, each of the polarizing plates will be described in detail.

(First polarizing plate)

The first polarizing plate is used as a back polarizing plate of a liquid crystal panel and is produced by laminating a transparent protective film on one side of a first polarizing film made of a polyvinyl alcohol resin. The transparent protective film is specifically a stretched polyethylene terephthalate or acrylic resin film. Specifically, the first polarizing film is a monoaxially stretched polyvinyl alcohol resin film in which dichroic dye is adsorbed and oriented.

As the polyvinyl alcohol resin, saponified polyvinyl acetate resin can be used. Examples of the polyvinyl acetate 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 saponification degree of the polyvinyl alcohol resin is usually 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol resin may be further modified. For example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The polymerization degree of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000.

Such a polyvinyl alcohol resin is used as the original film of the first polarizing film. The method of forming the polyvinyl alcohol resin is not particularly limited, and can be formed by a known method. The thickness of the polyvinyl alcohol-based original film is not particularly limited, but is, for example, about 10 to 150 占 퐉.

The first polarizing film usually has a step of uniaxially stretching the polyvinyl alcohol resin film, a step of adsorbing the dichroic dye by staining the polyvinyl alcohol resin film with a dichroic dye, a step of adsorbing the dichroic dye to the polyvinyl alcohol- A step of treating the 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.

The uniaxial stretching of the polyvinyl alcohol resin film may be carried out before dyeing the dichroic dye, at the same time as dyeing, or after the dyeing. In the case where the uniaxial stretching is carried out after dyeing, the uniaxial stretching may be carried out before the boric acid treatment or during the boric acid treatment. Of course, it is also possible to perform uniaxial stretching in these plural stages. In uniaxial stretching, stretching may be performed uniaxially between rolls having different peripheral velocities, or may be uniaxially stretched using a heat roll. The uniaxial stretching may be dry stretching in which stretching is performed in the atmosphere, or may be wet stretching in which stretching is performed while a polyvinyl alcohol resin film is swelled with a solvent. The stretching magnification is usually about 3 to 8 times.

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

When iodine is used as the dichroism dye, a method in which a polyvinyl alcohol resin film is dipped in an aqueous solution containing iodine and potassium iodide is generally employed. 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, and 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 占 폚, and 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 usually employed. The content of the dichroic dye in this aqueous solution is usually water, and 100 parts by weight of 1 × 10 ^-4 ~10 parts by weight, preferably from 1 × 10 ^-3 ~1 parts by weight, and, for example, 1 × 10 ^{- May be} about ² parts by weight or less. This 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 占 폚, and the immersion time (dyeing time) for 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 immersing the dyed polyvinyl alcohol resin film in an aqueous solution containing boric acid. The amount of boric acid in the aqueous solution containing boric acid is usually about 2 to 15 parts by weight, preferably about 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 usually 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, and 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 the water in the water washing treatment is usually about 5 to 40 캜, and the immersing time is usually about 1 to 120 seconds. After washing with water, drying treatment is carried out to obtain a first polarizing film. The drying treatment can be carried out using a hot-air dryer or a far-infrared heater. The drying treatment temperature is usually about 30 to 100 占 폚, preferably 50 to 80 占 폚. The drying treatment time is usually about 60 to 600 seconds, preferably 120 to 600 seconds.

Thus, the polyvinyl alcohol resin film is subjected to uniaxial stretching, dyeing with a dichroic dye, and boric acid treatment to obtain a first polarizing film. The thickness of the first polarizing film may be, for example, about 5 to 40 mu m.

The first polarizing plate related to the present invention is produced by laminating a transparent protective film on one side of a first polarizing film made of the polyvinyl alcohol resin. The stretched polyethylene terephthalate or acrylic resin film as the transparent protective film is excellent in mechanical properties, solvent resistance, scratch resistance, light fastness, transparency, cost and the like, and the acrylic resin film is a film hardly exhibiting retardation. According to the polarizing plate using such an acrylic resin film, it is possible to obtain a liquid crystal panel and a liquid crystal display device which are capable of achieving improvement in mechanical strength and thinning of the liquid crystal panel and excellent visibility with suppressed color unevenness caused by retardation have.

The oriented polyethylene terephthalate film used in the present invention is a film excellent in mechanical properties, solvent resistance, scratch resistance and cost. The polarizing plate of the present invention using such a stretched polyethylene terephthalate film has excellent mechanical strength and the like , The thickness can be reduced. Whether or not the polyethylene terephthalate film used in the polarizing plate has been stretched can be confirmed, for example, by the retardation value in the film plane.

Here, the polyethylene terephthalate is a resin in which 80 mol% or more of the repeating units are composed of ethylene terephthalate. Examples of other copolymerization components include isophthalic acid, p-β-oxyethoxybenzoic acid, 4,4'-dicarboxydiphenyl, 4,4'-dicarboxybenzophenone, bis (4- , Dicarboxylic acid components such as sebacic acid, 5-sodium sulfoisophthalic acid, and 1,4-dicarboxycyclohexane, for example, propylene glycol, butanediol, neopentyl glycol, diethylene glycol, cyclohexanediol, bisphenol A Ethylene glycol adduct, ethylene oxide adduct of ethylene glycol, polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. These dicarboxylic acid components and glycol components may be used in combination of two or more as necessary. It is also possible to use an oxycarboxylic acid such as p-oxybenzoic acid together with the dicarboxylic acid component and the glycol component. Such another copolymerization component may contain a dicarboxylic acid component and / or a diol component containing a small amount of an amide bond, a urethane bond, an ether bond, a carbonate bond or the like.

As a production method of polyethylene terephthalate, a so-called direct polymerization method in which terephthalic acid and ethylene glycol (and other dicarboxylic acids and / or other diols as required) are directly reacted, a method in which dimethyl ester of terephthalic acid and ethylene glycol Such as a dimethyl ester of a dicarboxylic acid component and / or another diol) is subjected to an ester exchange reaction, and so on.

The polyethylene terephthalate may contain additives known in the art if necessary. However, since transparency is required for optical use, it is preferable to add the additive to the minimum amount. Known additives include, for example, lubricants, antiblocking agents, heat stabilizers, antioxidants, antistatic agents, light stabilizers, and impact resistance improvers. Examples of the UV absorber include UV absorbers such as 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazole 2-hydroxyphenyl) -2H-benzotriazole, 2- [2-hydroxy-3,5-bis (?,? - dimethylbenzyl) phenyl ] -2H-benzotriazole, 2- (3,5-di-tert-butyl-2-hydroxyphenyl) (3,5-di-tert-butyl-2-hydroxyphenyl) -5-chloro-2H-benzotriazole, 2- Benzotriazole-based ultraviolet absorber such as 2- (2'-hydroxy-5'-tert-octylphenyl) -2H-benzotriazole, ; 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octyloxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy- 2-hydroxybenzophenone-based ultraviolet absorbers such as 2,2'-dihydroxy-4-methoxybenzophenone and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone; p-tert-butylphenyl salicylic acid ester, p-octylphenyl salicylic acid ester, and the like, and if necessary, two or more of them may be used. When the ultraviolet absorber is contained, the content thereof is usually 0.1% by weight or more, preferably 0.3% by weight or more, and more preferably 2% by weight or less.

The oriented polyethylene terephthalate film to be used in the present invention can be produced by molding the above-mentioned raw resin into a film and conducting stretching treatment. By performing the stretching treatment in this way, the mechanical strength of the polyethylene terephthalate film can be increased. The stretched polyethylene terephthalate film may be produced by any arbitrary method and is not particularly limited. However, it is preferable that the unoriented film obtained by melting the raw material resin and extruded into a sheet form is subjected to mechanical stretching at a temperature higher than the glass transition temperature of polyethylene terephthalate Followed by heat fixing treatment. The stretching treatment to be carried out on polyethylene terephthalate may be either uniaxial stretching or biaxial stretching.

The temperature at which the stretching is carried out is not particularly limited as long as it is a temperature higher than the glass transition temperature of polyethylene terephthalate, but is preferably within the range of 80 to 130 占 폚, and more preferably within the range of 90 to 120 占 폚.

The stretching ratio of the stretched polyethylene terephthalate film in the present invention is preferably 1.1 to 6 times, more preferably 3 to 5 times, in terms of the longitudinal direction and the width direction of the film. When the draw ratio is less than 1.1 times, the stretched polyethylene terephthalate film tends not to exhibit sufficient transparency.

From the viewpoint of reducing the deformation (deviation to the stretching axis) of the oriented main axis in the oriented polyethylene terephthalate film, before the above-described stretching and heat setting treatment, the film is stretched in the longitudinal direction ), It is preferable to relax the film in the width direction (the direction perpendicular to the traveling direction of the film). The relaxation treatment temperature is 90 to 200 캜, preferably 120 to 180 캜. The amount of relaxation varies depending on the transverse drawing conditions, and it is preferable to set the amount of relaxation and the temperature so that the stretched polyethylene terephthalate film after relaxation treatment has a heat shrinkage rate at 150 ° C of 2% or less.

The temperature of the heat fixing treatment is usually 180 to 250 캜, preferably 200 to 245 캜. The heat fixing treatment is first subjected to heat fixation treatment to a predetermined length, then the deformation of the orientation main axis is reduced and further relaxation treatment in the film longitudinal direction (film running direction) or the film width direction is carried out to improve the strength such as heat resistance . The amount of relaxation in this case is preferably adjusted so that the stretched polyethylene terephthalate film after the relaxation treatment has a heat shrinkage rate at 150 ° C of 1 to 10%, more preferably 2 to 5%.

The oriented polyethylene terephthalate film used in the present invention has a deviation angle (a maximum value of deformation of the oriented main axis) of the oriented main axis relative to the stretching direction of 30 degrees or less (preferably 10 degrees or less, more preferably 5 degrees or less ). &Lt; / RTI &gt; If the maximum value of the deformation of the orientation main axis is larger than 30 degrees, a sufficient color nonuniformity suppressing effect can not be obtained when it is adhered to the screen of the liquid crystal display device. The lower limit value of the maximum value of the strain of the oriented main axis of the oriented polyethylene terephthalate film is not particularly limited, but is preferably 0 degree or more. The maximum value of the strain of the main axis of orientation of the oriented polyethylene terephthalate film described above can be measured by using, for example, a phase difference film inspection apparatus RETS system (manufactured by Otsuka Electronics Co., Ltd.), a microwave transmission type molecular alignment system (MOA (Manufactured by Kikai Kikai Co., Ltd.).

The thickness (dPET) of the drawn polyethylene terephthalate film used in the present invention is preferably in the range of 20 to 60 mu m, more preferably in the range of 30 to 50 mu m. When the thickness dPET of the stretched polyethylene terephthalate film is less than 20 탆, it tends to be difficult to handle (handling property is poor), and when the thickness dPET exceeds 60 탆, .

The drawn polyethylene terephthalate film used in the present invention preferably has an MOR (Maximum Oriented Ratio) value of 1.5 or more, more preferably 2.0 or more, further preferably 2.2 or more, and particularly preferably 3.0 or more. This is because, when a polarizing plate using a stretched polyethylene terephthalate film having a MOR value of less than 1.5 is applied to a liquid crystal display device, unevenness in the oblique direction tends to increase. The upper limit value of the MOR value of the stretched polyethylene terephthalate film is not particularly limited, but it is sufficient that the upper limit value is 7 or less. Here, the MOR value is the ratio (maximum value / minimum value) of the maximum value to the minimum value of the transmission microwave intensity measured by the transmission type molecular alignment system, and is an anisotropic index. The MOR value can be measured using a microwave transmission type molecular alignment system (Oji Measurement Instruments Co., Ltd.).

The in-plane retardation value (RPET) of the oriented polyethylene terephthalate film used in the present invention is preferably 1000 nm or more, and more preferably 3000 nm or more. When the in-plane retardation value (RPET) is less than 1000 nm, the coloration from the front surface tends to be conspicuous. The in-plane retardation value (RPET) of the stretched polyethylene terephthalate film is represented by the following formula (1).

RPET = (na-nb) x dPET (One)

In the formula (1), na is the in-plane slow axis refractive index of the oriented polyethylene terephthalate film, nb is the refractive index in the in-plane fast axis direction (direction perpendicular to the in-plane slow axis direction) of the oriented polyethylene terephthalate film, dPET is The thickness of the stretched polyethylene terephthalate film)

The polyethylene terephthalate-based resin film used in the production method of the present invention may be provided with an easy adhesive layer, and the method for forming the polyethylene terephthalate-based resin film to which the adhesive layer is provided is not particularly limited. For example, A method in which a film is formed on a film on which a process has been completed, a process in which a polyethylene terephthalate resin is stretched, that is, a process is formed between a longitudinal stretching and a transverse stretching process, and a process Is adopted. Among them, from the viewpoint of productivity, a method of forming a polyethylene terephthalate resin after longitudinal stretching and then transversely stretching is preferably adopted.

The easy adhesive layer can be imparted to both sides of a polyethylene terephthalate resin or to one side bonded to a polarizing film made of a polyvinyl alcohol-based resin via an adhesive.

The components constituting the easy adhesive layer are not particularly limited, and examples thereof include a polyester series resin, a urethane series resin and an acrylic series resin having a polar group in its skeleton and a relatively low molecular weight and a low glass transition temperature. If necessary, a crosslinking agent, an organic or inorganic filler, a surfactant and a lubricant may be contained.

The acrylic resin constituting the acrylic resin film used in the first polarizing plate and the second polarizing plate means a material obtained by mixing a methacrylic resin and an additive added as required, and melt-kneading.

The methacrylic resin is a polymer composed mainly of methacrylic acid ester. The methacrylic resin may be a homopolymer of one kind of methacrylic acid ester or a copolymer of methacrylic acid ester and other methacrylic acid ester or acrylic acid ester. Examples of the methacrylic ester include alkyl methacrylates such as methyl methacrylate, ethyl methacrylate and butyl methacrylate, and the number of carbon atoms of the alkyl group is usually about 1-4. As the acrylic acid ester copolymerizable with the methacrylic acid ester, alkyl acrylate is preferable, and examples thereof include methyl acrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. The number of carbon atoms of the alkyl group is It is usually about 1 to 8. In addition to these, an aromatic vinyl compound such as styrene which is a compound having at least one polymerizable carbon-carbon double bond in the molecule, or a vinyl cyan compound such as acrylonitrile may be contained in the copolymer.

The acrylic resin preferably contains acrylic rubber particles in terms of impact resistance and film formability of the film. The amount of acrylic rubber particles contained in the acrylic resin is preferably 5% by weight or more, and more preferably 10% by weight or more. Although the upper limit of the amount of the acrylic rubber particles is not critical, if the amount of the acrylic rubber particles is excessively large, the surface hardness of the film is lowered, and when the film is subjected to the surface treatment, the solvent resistance to the organic solvent .

Accordingly, the amount of acrylic rubber particles contained in the acrylic resin is preferably 80% by weight or less, more preferably 60% by weight or less.

The acrylic rubber particles are particles composed of an elastomer mainly composed of an acrylate ester as an essential component and may be of a single layer structure consisting substantially of the elastomer alone or may be of a multi layer structure having one elastomer as a single layer do. Specific examples of the elastomer include a monomer comprising 50 to 99.9% by weight of alkyl acrylate, 0 to 49.9% by weight of at least one other vinyl monomer copolymerizable therewith, and 0.1 to 10% by weight of copolymerizable crosslinkable monomer A crosslinked elastic copolymer obtained by polymerization is preferably used.

Examples of the alkyl acrylate include methyl acrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate, and the number of carbon atoms of the alkyl group is usually 1 to 8 or so. Examples of other vinyl monomers copolymerizable with the alkyl acrylate include compounds having one polymerizable carbon-carbon double bond in the molecule, and more specifically, methacrylic acid esters such as methyl methacrylate, Aromatic vinyl compounds such as styrene, and vinyl cyan compounds such as acrylonitrile. Examples of the copolymerizable crosslinking monomer include crosslinkable compounds having at least two polymerizable carbon-carbon double bonds in the molecule, and more specifically, ethylene glycol di (meth) acrylate, butanediol di (Meth) acrylate of a polyhydric alcohol such as (meth) acrylate, alkenyl esters of (meth) acrylic acid such as allyl (meth) acrylate or methallyl methacrylate, and divinylbenzene. In the present specification, (meth) acrylate means methacrylate or acrylate, and (meth) acrylic acid means methacrylic acid or acrylic acid.

In addition to the acrylic rubber particles, conventional additives such as an ultraviolet absorber, an organic dye, a pigment, an inorganic dye, an antioxidant, an antistatic agent, a surfactant, and the like may be contained in the acrylic resin. Among them, the ultraviolet absorber is preferably used in improving the weather resistance. Examples of ultraviolet absorbers include 2,2'-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol] 2-hydroxyphenyl) -2H-benzotriazole, 2- [2-hydroxy-3,5-bis (?,? - dimethylbenzyl) Benzotriazole, 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chloro-2H-benzotriazole (3,5-di-tert-butyl-2-hydroxyphenyl) -5-chloro-2H- benzotriazole, 2- ) -2H-benzotriazole, and 2- (2'-hydroxy-5'-tert-octylphenyl) -2H-benzotriazole; 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octyloxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy- 2-hydroxybenzophenone-based ultraviolet absorbers such as 2,2'-dihydroxy-4-methoxybenzophenone and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone; p-tert-butylphenyl salicylic acid ester, p-octylphenyl salicylic acid ester, and the like, and if necessary, two or more of them may be used. When the ultraviolet absorber is contained in the acrylic resin, the amount thereof is usually 0.1% by weight or more, preferably 0.3% by weight or more, and more preferably 2% by weight or less.

As a method for obtaining the acrylic resin film used for the first and second polarizing plates, various generally known methods such as a method using a feed block and a method using a multi-manifold die can be used. Among them, for example, a method in which a laminate is formed by interposing a feed block, subjected to multilayer melt extrusion molding from a T die, and at least one side of the obtained laminated film is brought into contact with a roll or a belt to form a film, . Particularly, from the viewpoint of improving the surface smoothness and surface gloss of the acrylic resin film, a method of bringing the both surfaces of the laminated film-like product obtained by the multilayer melt extrusion molding into contact with the roll surface or the belt surface to form a film is preferable. In the roll or belt used at this time, the roll surface or the belt surface in contact with the acrylic resin preferably has a mirror surface in order to impart smoothness to the surface of the acrylic resin film.

A haze may be imparted to the second acrylic resin film. The method of imparting haze is not particularly limited, and examples thereof include a method of mixing inorganic fine particles or organic fine particles in the raw resin (acrylic resin), a method of mixing the inorganic fine particles or organic fine particles in the raw acrylic resin A method of coating a coating liquid in which inorganic fine particles or organic fine particles are mixed with a resin binder on the surface opposite to the surface of the substrate. Examples of the inorganic fine particles include silica, colloidal silica, alumina, alumina sol, aluminosilicate, alumina-silica composite oxide, kaolin, talc, mica, calcium carbonate, calcium phosphate and the like. As the organic fine particles, resin particles such as crosslinked polyacrylic acid particles, crosslinked polystyrene particles, crosslinked polymethyl methacrylate particles, silicone resin particles, and polyimide particles can be used.

The surface of the second acrylic resin film opposite to the surface to which the first polarizing film is adhered may be subjected to a surface treatment such as hard coat treatment or antistatic treatment in addition to the antiglare treatment (haze treatment). In addition, a coat layer made of a liquid crystal compound or a high molecular weight compound or the like may be formed.

The thickness of the first and second acrylic resin films is preferably about 20 to 120 mu m, more preferably about 30 to 80 mu m. If the thickness of the film is less than 20 占 퐉, handling tends to be difficult, and if the thickness exceeds 120 占 퐉, the advantages of thinning tend to be reduced.

In the first polarizing plate, an adhesive or a pressure-sensitive adhesive layer for adhering the liquid crystal cell and the polarizing plate may be formed on the surface of the first polarizing film opposite to the surface on which the first transparent protective film is adhered. A transparent film such as a protective film or an optical compensation film may be laminated on the surface of the first polarizing film opposite to the surface to which the transparent protective film is adhered and an adhesive or a pressure- . Examples of the transparent film include a cellulose film such as a triacetylcellulose film (TAC film), an olefin film, an acrylic film, and a polyester film. Further, an optical functional film described later may be laminated on the transparent film, and an adhesive or pressure-sensitive adhesive layer may be formed on the optical functional film.

The cellulose film is a film composed of a partial esterified product or a completely esterified product of cellulose, and examples thereof include films composed of acetic acid ester, propionic acid ester, butyric acid ester and mixed ester thereof of cellulose. More specifically, a triacetylcellulose film, a diacetylcellulose film, a cellulose acetate propionate film, a cellulose acetate butyrate film and the like can be given. Examples of such a cellulose ester film include commercially available products such as Fujitac TD80 (manufactured by Fuji Film), Fujitac TD80UF (manufactured by Fuji Film), Fujitac TD80UZ (manufactured by Fuji Film Co., Ltd.) , KC8UX2M (manufactured by Konica Minolta Opto), KC8UY (manufactured by Konica Minolta Opto), and the like.

As the optical compensation film made of a cellulose film, for example, a film containing a compound having a retardation adjusting function in a cellulose film, a film coated with a compound having a retardation adjusting function on the surface of the cellulose film, a cellulose film, Or a film obtained by biaxial stretching. Examples of commercially available optical compensation films of cellulose include "WV BZ 438" and "WV EA" sold by Fuji Film Co., Ltd. as a series of "Wide Film" (Wide View Film), Konica Minolta Opto Quot; KC4FR-1 &quot; and &quot; KC4HR-1 &quot;

Examples of the optical compensation film comprising the olefin film include an optical compensation film obtained by, for example, uniaxially or biaxially stretching a cycloolefin resin film. When the polarizing plate set of the present invention is used for a liquid crystal panel for a large liquid crystal television, particularly a liquid crystal panel having a liquid crystal cell of a vertically aligned (VA) mode, the optical compensation film is preferably a Characteristics, and durability. Here, the cycloolefin resin film is a film made of a thermoplastic resin having a unit of a monomer comprising a cyclic olefin (cycloolefin) such as norbornene or a polycyclic norbornene monomer. The cycloolefin resin film may be a hydrogenation product of a ring-opening polymer using a single cycloolefin or a ring-opening copolymer using two or more cycloolefins, or an addition copolymer of a cycloolefin and an aromatic compound having a chain type olefin and / . It is also effective that a polar group is introduced into the main chain or side chain.

When a copolymer of a cycloolefin and an aromatic compound having a chain type olefin and / or vinyl group is used, examples of the chain type olefin include ethylene and propylene. Examples of the aromatic compound having a vinyl group include styrene, ? -methylstyrene, and nuclear alkyl-substituted styrene. In such a copolymer, the unit of the monomer composed of cycloolefin may be 50 mol% or less, for example, about 15 to 50 mol%. In particular, in the case of a ternary copolymer of a cycloolefin, an aromatic compound having a chain type olefin and a vinyl group, the unit of the monomer comprising the cycloolefin can be made in such a relatively small amount. In such a ternary copolymer, the unit of the monomer composed of the chain olefin is usually about 5 to 80 mol%, and the unit of the monomer composed of the aromatic group having the vinyl group is usually about 5 to 80 mol%.

Commercially available thermoplastic cycloolefin resins include "Topas" sold by Ticona of Germany, "Aton" sold by JSR, "Zeonor" sold by Nippon Zeon Co., ZEONEX "sold by Mitsui Chemicals, Inc., and" APEL "(all trade names) sold by Mitsui Chemicals, Inc., and they can be suitably applied to the cycloolefin resin film. A cycloolefin resin film can be obtained by forming such a cycloolefin resin. As the film forming method, known methods such as a solvent casting method and a melt extrusion method are suitably used. Also, for example, "Essine" and "SCA40" sold by Sekisui Chemical Co., Ltd., "Zeonoah Film" sold by Optesis, and "Aton" sold by JSR Co., (All trade names), and the like are also commercially available, and these are also preferably used.

The cycloolefin resin film as the optical compensation film is preferably stretched in at least one direction. As a result, an appropriate optical compensation function is imparted to contribute to the widening of the viewing angle of the liquid crystal display device. In-plane retardation value of the stretched cycloolefin resin film (R ₀₎ is more preferably not more than more than 100㎚ 40㎚ or less preferably, over 80㎚ 40㎚. When the in-plane retardation value (R ₀ ) is less than 40 nm or exceeds 100 nm, the viewing angle compensation capability of the liquid crystal panel tends to be lowered. The retardation value (Rth) in the thickness direction of the stretched cycloolefin resin film is preferably 80 nm or more and 250 nm or less, and more preferably 100 nm or more and 250 nm or less. When the retardation value in the thickness direction (Rth) is less than 80 nm or more than 250 nm, the viewing angle compensation ability of the liquid crystal panel tends to decrease similarly to the above. The in-plane retardation value (R ₀ ) and the thickness direction retardation value (Rth) of the stretched cycloolefin-based resin film are represented by the following formulas (1) and (2), respectively.

_{R 0 = (nx-ny)} × d (1)

Rth = [(nx + ny) / 2-nz] xd (2)

Ny is the refractive index in the in-plane fast axis direction (direction perpendicular to the in-plane slow axis direction) of the stretched cycloolefin resin film, And d is the thickness of the stretched cycloolefin-based resin film.

Preferable refractive index properties as described above are not only properly adjusting the draw ratio and the stretching speed but also various temperatures such as a preheating temperature at the time of stretching, a stretching temperature, a heat set (a process of reducing the strain of the film after stretching) (Including the temperature pattern). By conducting the stretching under a relatively generous condition, the above-mentioned preferable refractive index characteristics can be obtained. For example, the stretch ratio is preferably 1.05 times or more and 1.6 times or less, more preferably 1.1 times or more and 1.5 times or less. In the case of biaxial stretching, the stretching magnification in the maximum stretching direction may be in the above range.

If the thickness (d) of the stretched cycloolefin-based resin film is too large, the workability tends to be poor, and furthermore, problems such as lowered transparency and weight of the polarizing plate tend to occur. Therefore, the thickness (d) of the stretched cycloolefin-based resin film is preferably about 40 to 80 탆.

On the first acrylic resin film and / or the transparent film as the protective film or the optical compensation film laminated on the surface of the first polarizing film opposite to the surface on which the first acrylic resin film is adhered, A functional film may be attached. Examples of the optically functional film include an optically compensatory film based on the cellulose-based film or the cycloolefin-based film described above, for example, an optically compensatory film on which a liquid crystalline compound is applied and oriented, A reflection type polarizing film that transmits light and reflects polarized light exhibiting a property opposite to that of the polarizing film, a retardation film made of a polycarbonate resin, a film having an antiglare function having a concavo-convex shape on the surface, a film , A reflective film having a reflective function on the surface, and a transflective film having a reflective function and a transmissive function. As a commercially available product corresponding to the optical compensation film to which the liquid crystalline compound is applied on the surface of the base material and to which the liquid crystal compound is applied, "WV film" sold by Fuji Film, "NH film &Quot; and &quot; NR film &quot; (all trade names). A commercially available product corresponding to a reflection type polarizing film that transmits polarized light of a certain kind and reflects polarized light exhibiting properties opposite to that of the polarized light is commercially available from 3M Company (3M Company) (Sumitomo 3M Co., Ltd., Japan) &Quot; DBEF &quot; (all trade names).

Next, a method of laminating a first acrylic resin film and / or a transparent film as the above protective film or optical compensation film on the first polarizing film will be described. As a method of laminating the first acrylic resin film and / or the transparent film on the surface of the first polarizing film, a method of adhering by using an adhesive is usually employed. When an adhesive is used on both surfaces of the first polarizing film, an adhesive of the same kind on both sides may be used, or a different kind of adhesive may be used.

As the adhesive, from the viewpoint of thinning the adhesive layer, it is water-based, that is, the adhesive component is dissolved in water, or the adhesive component is dispersed in water. For example, a composition using a polyvinyl alcohol-based resin or urethane resin as a main component may be mentioned as a preferable adhesive.

When a polyvinyl alcohol-based resin is used as the main component of the adhesive, the polyvinyl alcohol-based resin may be a partially saponificated polyvinyl alcohol or a completely saponified polyvinyl alcohol, a carboxyl group-modified polyvinyl alcohol, an acetacetyl group-modified polyvinyl alcohol, Modified polyvinyl alcohol resins such as polyvinyl alcohol modified with an alkyl group, polyvinyl alcohol modified with an amino group, and the like. When a polyvinyl alcohol-based resin is used as an adhesive component, the adhesive is often prepared as an aqueous solution of a polyvinyl alcohol-based resin. The concentration of the polyvinyl alcohol resin in the adhesive is usually about 1 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of water.

To improve adhesiveness, it is preferable to add a curing component such as glyoxal or a water-soluble epoxy resin or a crosslinking agent to an adhesive containing a polyvinyl alcohol-based resin as a main component. Examples of the water-soluble epoxy resin include epoxy resins obtained by reacting epichlorohydrin with polyamide polyamines obtained by the reaction of polyalkylene polyamines such as diethylene triamine and triethylene tetramine with dicarboxylic acids such as adipic acid And polyamide polyamine epoxy resins. Commercially available products of such polyamidepolyamine epoxy resins include Sumirez Resin 650 and Sumirez Resin 675 sold by Sumika Chemtech Co., Ltd. and WS-525 sold by Nippon PMC Co., Ltd. And these can be preferably used. The amount of the curable component or crosslinking agent to be added is usually 1 to 100 parts by weight, preferably 1 to 50 parts by weight, based on 100 parts by weight of the polyvinyl alcohol resin. When the addition amount is small, the adhesive property improving effect is small. On the other hand, when the addition amount is large, the adhesive layer tends to become weak.

When a urethane resin is used as the main component of the adhesive, examples of suitable adhesive compositions include a mixture of a polyester-based ionomer-type urethane resin and a compound having a glycidyloxy group. The polyester-based ionomer-type urethane resin referred to herein is a urethane resin having a polyester skeleton in which a small amount of an ionic component (hydrophilic component) is introduced. Such an ionomeric urethane resin is preferable as an aqueous adhesive since it emulsifies directly in water without using an emulsifier and becomes an emulsion. The polyester ionomer type urethane resin itself is known. For example, JP-A-7-97504 discloses a polyester-based ionomer-type urethane resin as an example of a polymer dispersant for dispersing a phenolic resin in an aqueous medium, and JP- 070140 and Japanese Unexamined Patent Application Publication No. 2005-181817 disclose a method of bonding a cycloolefin resin film to a polarizing film made of a polyvinyl alcohol resin using a mixture of a polyester ionomer type urethane resin and a compound having a glycidyloxy group as an adhesive Form.

A photo-curable adhesive may be used as the adhesive. Examples of the photo-curable adhesive include a mixture of a photo-curable epoxy resin and a photo cationic polymerization initiator. Examples of the photocurable epoxy resin include an alicyclic epoxy resin, an epoxy resin not having an alicyclic structure, and a mixture thereof. As the photo-curable adhesive, a radical polymerization initiator and / or a cationic polymerization initiator may be added to an epoxy resin, an acrylic resin, an octacene resin, a urethane resin, a polyvinyl alcohol resin, and the like.

As a method for attaching the transparent protective film and / or the transparent film to the surface of the first polarizing film by using an adhesive, conventionally known methods can be used. For example, a flexible method, a Meyer bar coating method, a gravure coating method, A method in which an adhesive is applied to the adhesive surface of the first polarizing film and / or the film adhered to the first polarizing film by a comma coater method, a doctor blade method, a die coating method, a dip coating method, a spraying method, or the like. The flexible method is a method in which a film as an object to be coated is moved in a generally vertical direction, a generally horizontal direction, or an inclined direction therebetween, and an adhesive is applied to the surface to spread the film.

After the adhesive is applied by the above method, the first polarizing film and the film adhered to the first polarizing film are sandwiched by a nip roll or the like to bond them together.

A method of dropping an adhesive between the first polarizing film and a film adhered to the first polarizing film, and then pressing the laminated body with a roll or the like to uniformly expand the film can also be preferably used. In this case, metal, rubber, or the like can be used as the material of the roll. Further, a method of dropping an adhesive between the first polarizing film and a film adhered to the first polarizing film, passing the laminated body between the rolls and pressing the film, and then expanding the film is also preferably employed. In this case, these rolls may be made of the same material or different materials.

Further, the thickness of the adhesive layer after adhering using the nip roll or the like before drying or curing is preferably 5 占 퐉 or less, and more preferably 0.01 占 퐉 or more.

The adhesive surface of the first polarizing film and / or the film to be adhered thereto may be suitably subjected to surface treatment such as plasma treatment, corona treatment, ultraviolet ray irradiation treatment, flame treatment, saponification treatment and the like in order to improve the adhesion . As the saponification treatment, a method of immersing in an aqueous alkaline solution such as sodium hydroxide or potassium hydroxide may be mentioned.

The laminate bonded via the water-based adhesive is generally subjected to drying treatment, and the adhesive layer is dried and cured. The drying treatment can be carried out by, for example, blowing hot air. The drying temperature is suitably selected in the range of about 40 to 100 캜, preferably 60 to 100 캜. The drying time is, for example, about 20 to 1,200 seconds. The thickness of the adhesive layer after drying is usually about 0.001 to 5 mu m, preferably 0.01 mu m or more, more preferably 2 mu m or less, and further preferably 1 mu m or less. If the thickness of the adhesive layer becomes too thick, the appearance of the polarizing plate tends to be poor.

After the drying treatment, curing at least one half day, usually one day or more, at room temperature or more may be carried out to obtain sufficient bonding strength. This curing is typically carried out in a roll-wound state. The preferable curing temperature is in the range of 30 to 50 占 폚, more preferably 35 to 45 占 폚. When the curing temperature exceeds 50 캜, the so-called &quot; tight winding phenomenon &quot; tends to occur in the roll-up state. The humidity at the time of curing is not particularly limited, but it is preferable that the relative humidity is selected to be in the range of 0% RH to 70% RH. The curing time is usually about 1 day to 10 days, preferably about 2 days to 7 days.

On the other hand, when a polarizing film is adhered to a film attached thereto using a photo-curable adhesive, the photo-curable adhesive is cured by irradiating an active energy ray after bonding. Although a light source of an active energy ray is not particularly limited, an active energy ray having a light emission distribution at a wavelength of 400 nm or less is preferable, and specifically, a low energy mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, Mercury lamps, metal halide lamps and the like are preferably used. The light irradiation intensity for the photo-curable adhesive is suitably determined according to the composition of the photo-curable adhesive and is not particularly limited, but it is preferable that the irradiation intensity in the wavelength range effective for activation of the polymerization initiator is 0.1 to 6000 mW / cm 2. When the irradiation intensity is not less than 0.1 mW / cm 2, the reaction time is not excessively long, and when the irradiation intensity is 6000 mW / cm 2 or less, the heat radiated from the light source and heat generated during curing of the photocurable adhesive deteriorate the yellowing of the epoxy resin, . The light irradiation time for the photo-curable adhesive is not particularly limited as long as it is controlled for each of the photo-curable adhesives to be cured, but it is preferable that the accumulated light quantity represented by the product of the irradiation intensity and the irradiation time is set to 10 to 10,000 mJ / cm 2. When the accumulated light quantity for the photo-curing adhesive is 10 mJ / cm 2 or more, the active species originating from the polymerization initiator can be generated in a sufficient amount to promote the curing reaction more surely. When the amount is less than 10000 mJ / cm 2, Good productivity can be maintained. The thickness of the adhesive layer after irradiation with active energy rays is usually about 0.001 to 5 mu m, preferably 0.01 mu m or more, more preferably 2 mu m or less, and further preferably 1 mu m or less.

When the photo-curable adhesive is cured by irradiation of an active energy ray, all of the polarizers such as the polarizability, transmittance and hue of the first polarizing film, and the transparency of the first acrylic resin film, the optical compensation film, It is preferable to perform the curing under the condition that the function is not deteriorated.

(Second polarizing plate)

The second polarizing plate is used as a polarizing plate on the front side (viewing side) of a liquid crystal panel, and a retardation film having a haze value in a range of 0.1% or more and 45% or less is formed on one surface of a second polarizing film made of a polyvinyl alcohol- . Specifically, the second polarizing film is a monoaxially stretched polyvinyl alcohol-based resin film in which a dichromatic dye is adsorbed and oriented, and the same polarizing film as described for the first polarizing film can be used. The first polarizing film and the second polarizing film may be the same or different with respect to the outer shape (thickness, etc.), the material, the manufacturing method and the like.

The anti-glare film can be produced by laminating a hard coat layer having a fine concavo-convex shape on its surface using an acrylic resin film as a base material. The acrylic resin film to be the substrate may be the same as that described in the above-mentioned acrylic resin film. The acrylic resin film used in the first polarizing plate and the second polarizing plate may be the same or different with respect to the outer shape (thickness, etc.), the material, the composition and the manufacturing method. By using such an acrylic resin film as a substrate, it is possible to further improve the mechanical strength of the liquid crystal panel and achieve further thinning of the liquid crystal panel.

The haze value of the antifogging film is in the range of 0.1% to 45%. A haze value of 0.1% is equivalent to a substantially transparent hard coat layer. When the haze value is higher than 45%, the screen becomes whitened and visibility is lowered. The haze value of the antifogging film may be less than 5%, and preferably 5% or more from the viewpoint of reducing the visibility of the fluorescent lamp. Here, the haze value is measured by a method according to JIS K7136.

The thickness of the acrylic resin film is preferably about 20 to 120 mu m, more preferably about 30 to 80 mu m. If the thickness of the film is less than 20 占 퐉, handling tends to be difficult, and if the thickness exceeds 120 占 퐉, the advantages of thinning tend to be reduced.

The hard coat layer having the fine surface irregularities may be formed by a method of forming a coating film containing organic fine particles or inorganic fine particles on the surface of the second acrylic resin film or a method of forming a coating film containing or not containing organic fine particles or inorganic fine particles Followed by pressing on a roll provided with a concavo-convex shape (for example, embossing method or the like), but the present invention is not limited thereto. As a method for forming the coating film, for example, a method of applying a coating liquid containing a binder component comprising a curable resin composition and organic fine particles or inorganic fine particles on the surface of an acrylic resin film can be exemplified.

As the inorganic fine particles, silica, colloidal silica, alumina, alumina sol, aluminosilicate, alumina-silica composite oxide, kaolin, talc, mica, calcium carbonate, calcium phosphate and the like can be used as representative examples. As the organic fine particles, resin particles such as crosslinked polyacrylic acid particles, methyl methacrylate / styrene copolymer resin particles, crosslinked polystyrene particles, crosslinked polymethyl methacrylate particles, silicone resin particles and polyimide particles can be used .

The binder component for dispersing the inorganic fine particles or the organic fine particles is preferably selected from a material having a high hardness (hard coat). As the binder component, an ultraviolet curable resin, a thermosetting resin, an electron beam curable resin or the like can be used. From the standpoint of productivity and hardness, an ultraviolet curable resin is preferably used. Commercially available ultraviolet curable resins may be used. For example, polyfunctional acrylates such as trimethylolpropane triacrylate and pentaerythritol tetraacrylate may be used alone or in combination with two or more kinds of acrylic acid such as "Irgacure 907", "Irgacure 184" (Trade name, manufactured by Nippon Kayaku Co., Ltd.) and "Lucilin TPO" (manufactured by BASF Co., Ltd.) can be used as the ultraviolet ray curable resin. For example, in the case of using an ultraviolet ray-curable resin, it is preferable to disperse inorganic fine particles or organic fine particles in an ultraviolet ray-curable resin, then apply the resin composition onto an acrylic resin film, and irradiate with ultraviolet rays, A hard coat layer in which inorganic fine particles or organic fine particles are dispersed in a resin can be formed.

Examples of the ultraviolet ray curable resin include, for example, urethane acrylate, polyol (meth) acrylate, a mixture of a (meth) acrylic polymer having an alkyl group containing two or more hydroxyl groups and a photopolymerization initiator .

The urethane acrylates are preferably prepared using (meth) acrylic acid and / or (meth) acrylic acid esters, polyols, and diisocyanates. For example, a urethane acrylate can be prepared by preparing a hydroxy (meth) acrylate having at least one hydroxyl group from (meth) acrylic acid and / or a (meth) acrylic acid ester and a polyol and reacting it with a diisocyanate have. These (meth) acrylic acid and / or (meth) acrylic acid ester, polyol and diisocyanate may be used individually or in combination of two or more. Various additives may be added depending on the purpose.

Examples of the (meth) acrylic esters include alkyl (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, (Meth) acrylate; And cycloalkyl (meth) acrylates such as cyclohexyl (meth) acrylate.

The polyol is a compound having at least two hydroxyl groups, and examples thereof include ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, Butanediol, 1,6-hexanediol, 1,9-nonanediol, 1,10-decanediol, 2,2,4-trimethyl-1,3-pentanediol, Cyclohexanediol, spiroglycol, tricyclodecane methylol, hydrogenated bisphenol A, ethylene oxide-added bisphenol A, propylene glycol monomethyl ether, propylene glycol monomethyl ether, Oxides include bisphenol A, trimethylol ethane, trimethylol propane, glycerin, 3-methylpentane-1,3,5-triol, pentaerythritol, dipentaerythritol, tripentaerythritol and glucose .

As the diisocyanate, for example, various diisocyanates of aromatic, aliphatic or alicyclic type can be used. Specific examples include tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 2,4-tolylene diisocyanate, 4,4-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, 3,3-dimethyl 4,4-diphenyl diisocyanate, xylylene diisocyanate, trimethylhexamethylene diisocyanate, 4,4-diphenylmethane diisocyanate, and hydrogenated products thereof.

Specific examples of the polyol (meth) acrylate include pentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa ) Acrylate, and 1,6-hexanediol (meth) acrylate. These components may be used alone or in combination. In addition, various additives may be added as necessary. The polyol (meth) acrylate preferably contains pentaerythritol triacrylate and pentaerythritol tetraacrylate. These may be a copolymer or a mixture.

Examples of the (meth) acrylic polymer having an alkyl group containing two or more hydroxyl groups include (meth) acrylic polymers having 2,3-dihydroxypropyl groups, 2-hydroxyethyl groups and 2,3-di (Meth) acrylic polymer having a hydroxypropyl group.

Examples of the photopolymerization initiator include 2,2-dimethoxy-2-phenylacetophenone, acetophenone, benzophenone, xanthone, 3-methylacetophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, Benzoin propyl ether, benzyl dimethyl ketal, N, N, N ', N'-tetramethyl-4,4'-diaminobenzophenone, 1- (4-isopropylphenyl) -2- Propane-1-one, and other thioxanthone compounds.

A solvent is added to the mixture if necessary. The solvent is not particularly restricted but includes, for example, ethyl acetate, butyl acetate, and mixed solvents thereof.

The mixture may contain a leveling agent, for example, a fluorine-based or silicon-based leveling agent. Examples of silicone leveling agents include reactive silicones, polydimethylsiloxanes, polyether-modified polydimethylsiloxanes, and polymethylalkylsiloxanes. Preferably a reactive silicone and a siloxane-based leveling agent. By using a reactive silicone leveling agent, the surface of the hard coat layer is imparted with slidability and excellent abrasion resistance can be maintained for a long period of time. When a siloxane-based leveling agent is used, film formability can be improved.

As the leveling agent for reactive silicon, for example, those having a siloxane bond, an acrylate group and a hydroxyl group can be cited. As a specific example,

(2-acryloyl-3-hydroxypropoxypropylsiloxane) = 0.8: 0.16: 0.04 (molar ratio): (dimethylsiloxane) :( 3-acryloyl-2-hydroxypropoxypropylsiloxane) / RTI &gt;

a copolymer of (b) (dimethylsiloxane): (hydroxypropylsiloxane) :( 6-isocyanatehexylisocyanuric acid) :( aliphatic polyester) = 6.3: 1.0: 2.2: 1.0 (molar ratio)

(methylpolyethylene glycol propyl ether siloxane having a terminal hydroxyl group): 0.88: 0.07: 0.05 (molar ratio) (c) (dimethylsiloxane): (methyl polyethylene glycol propyl ether siloxane having a terminal acrylate) .

By using the binder component (binder resin) of acrylic resin exemplified above, the adhesion with the acrylic resin film is improved, and the film having improved mechanical strength and capable of preventing surface scratches more effectively can be obtained .

In the case of forming the hard coat layer having the fine surface concave-convex shape by the embossing method, the shape of the mold may be transferred to the hard coat layer formed on the acrylic resin film by using the mold having the fine convexo-concave shape. The transfer to the mold-shaped hard coat layer is preferably carried out by embossing, and the embossing method is preferably a UV embossing method using an ultraviolet curable resin. In the case of forming the fine surface irregularities by the embossing method, the hard coat layer may or may not contain inorganic or organic fine particles.

In the UV embossing method, an ultraviolet ray hardening resin layer is formed on the surface of an acrylic resin film, and the ultraviolet ray hardening resin layer is hardened while pressing the uneven surface of the mold, whereby the uneven surface of the mold is transferred to the ultraviolet ray hardenable resin layer. Specifically, an ultraviolet ray-curable resin is coated on an acrylic resin film, the ultraviolet ray-curable resin is cured by irradiating ultraviolet rays from the side of the acrylic resin film in a state in which the coated ultraviolet-curable resin is in contact with the uneven surface of the mold, The acrylic resin film on which the ultraviolet curable resin layer after curing is formed is peeled from the mold to transfer the shape of the mold to the ultraviolet curing resin. The kind of the ultraviolet ray-curable resin is not particularly limited, and for example, the above-mentioned ultraviolet ray-curable resin can be used. Further, a visible light curable resin which can be cured to visible light having a longer wavelength than ultraviolet ray may be used by appropriately selecting a photoinitiator in place of the ultraviolet curable resin.

The thickness of the hard coat layer is not particularly limited, but is preferably from 2 탆 to 30 탆, and more preferably from 3 탆 to 30 탆. If the thickness of the hard coat layer is less than 2 mu m, sufficient hardness can not be obtained and the surface tends to be scratched easily. If it is thicker than 30 mu m, the hard coat layer tends to be cracked, The film is curled and the productivity tends to be lowered.

It is preferable that haze is imparted to the anti-glare film by the hard coat layer as described above. In addition to formation of the hard coat layer, haze may be imparted by dispersing inorganic or organic fine particles in the acrylic resin film as the base material. It is also possible to use an acrylic resin film having no hard coat layer and inorganic or organic fine particles dispersed therein as the light-shielding film. In these cases, the inorganic or organic fine particles described above may be used. The thickness of the acrylic resin film in which the inorganic or organic fine particles are dispersed is preferably 20 to 120 占 퐉, and more preferably 30 to 80 占 퐉.

A surface treatment such as antistatic treatment may be performed on the surface (acrylic resin film or hard coat layer) opposite to the surface to which the second polarizing film is adhered in the antifogging film. In addition, a coat layer made of a liquid crystal compound or a high molecular weight compound or the like may be formed.

In the second polarizing plate, an adhesive or pressure-sensitive adhesive layer for attaching the liquid crystal cell and the polarizing plate may be formed on the surface of the second polarizing film opposite to the surface to which the retardation film is adhered. Further, a transparent film such as a protective film or an optical compensation film may be laminated on a surface of the second polarizing film opposite to the surface to which the retardation film is adhered, and an adhesive or pressure-sensitive adhesive layer . Examples of the transparent film include a cellulose film such as a triacetylcellulose film (TAC film), an olefin film, an acrylic film, and a polyester film. Further, an optical functional film may be laminated on the transparent film, and an adhesive or pressure-sensitive adhesive layer may be formed on the optical functional film. As the protective film, the optical compensation film and the optical functional film, those described for the first polarizing plate can be used in the same manner.

As a method for laminating a polarizing film and / or a transparent film as a protective film or an optical compensation film on the second polarizing film, the same method as described for the first polarizing plate can be employed. When an adhesive is used on both sides of the second polarizing film, an adhesive of the same type on both sides may be used, or a different kind of adhesive may be used. The adhesive used for producing the first polarizing plate and the adhesive used for producing the second polarizing plate may be the same or different.

<Liquid Crystal Panel and Liquid Crystal Display Device>

The liquid crystal panel of the present invention is a liquid crystal panel using the aforementioned polarizing plate set, specifically, the first polarizing plate, the liquid crystal cell and the second polarizing plate are arranged in this order. Here, the first polarizing plate is disposed so that the surface of the first polarizing film opposite to the surface on which the first acrylic resin film is laminated is opposed to the liquid crystal cell, and the second polarizing plate is disposed in the second polarizing film And the surface opposite to the surface on which the current film is laminated is arranged to face the liquid crystal cell. That is, the first polarizing plate is attached to the liquid crystal cell by using an adhesive or a pressure-sensitive adhesive, with the surface of the first polarizing film opposite to the surface on which the first acrylic resin film is laminated as the adhesive surface, Is adhered to the liquid crystal cell via a transparent film as a protective film or an optical compensation film laminated on the surface opposite to the surface on which the first acrylic resin film is laminated in the film or an optical functional film laminated thereon. Similarly, the second polarizing plate may be attached to the liquid crystal cell by using an adhesive or a pressure-sensitive adhesive, with the surface opposite to the surface on which the light-shielding film is laminated in the second polarizing film as the adhesive surface, Is attached to the liquid crystal cell via a protective film laminated on the surface opposite to the laminated surface of the light-shielding film, a transparent film as an optical compensation film, or the like, or an optical functional film laminated thereon.

As the liquid crystal cell, conventionally known configurations can be adopted, and liquid crystal cells of various types such as a twisted nematic (TN) mode and a vertical alignment (VA) mode can be used.

Since the liquid crystal panel using the polarizing plate set of the present invention uses the transparent protective film as the protective film of the first polarizing plate and the light blocking film using the acrylic resin film as the base film as the protective film of the second polarizing plate, And prevention of scratches on the surface, improvement of visibility, and prevention of warpage are realized.

1 is a schematic cross-sectional view showing an example of a basic layer structure of a liquid crystal display device of the present invention. 1 includes a backlight 10, a light diffusing plate 50 and a liquid crystal cell 40 and a first polarizing plate (second polarizing plate) 40 as a back side polarizing plate attached to one surface of the liquid crystal cell 40 And a second polarizing plate 30 as a front polarizing plate attached to the other surface of the liquid crystal cell 40 in this order. The first polarizing plate 20 has a structure in which the first polarizing film 21 is sandwiched between the optical compensation film 23 and the first acrylic resin film 25 and the optical compensation film 23 is sandwiched between the liquid crystal cell 40 As shown in Fig. The second polarizing plate 30 has a configuration in which the second polarizing film 31 is sandwiched between the optical compensation film 33 and the retardation film 34 and the optical compensation film 33 is disposed between the liquid crystal cell 40 As shown in Fig. In this example, the anti-glare film 34 is composed of a second acrylic resin film 35 and a hard coat layer 36 having a fine concave-convex shape on the surface thereof laminated thereon. In the liquid crystal display of the present invention shown in Fig. 1, the liquid crystal panel is constituted such that the first polarizing plate 20 as the back side polarizing plate is on the backlight side, that is, the first acrylic resin film 25, As shown in Fig.

Here, the optical diffuser plate 50 is an optical member having a function of diffusing light from the backlight 10, for example, a thermoplastic resin in which particles as a light diffusing agent are dispersed to impart light diffusibility, The surface of the plate may be provided with irregularities so as to provide light diffusibility, or a coating layer of a resin composition in which particles are dispersed on the surface of the thermoplastic resin plate to provide a light diffusing property. The thickness may be about 0.1 to 5 mm. A prism sheet (also referred to as a condensing sheet, for example, "BEF" manufactured by 3M Company, etc.) and a brightness enhancing sheet (equivalent to the above-described reflective polarizing film) are provided between the light diffusing plate 50 and the liquid crystal panel (DBEF)), and a sheet exhibiting other optical functionality such as a light diffusion sheet may be disposed. If necessary, one or more sheets having different optical functionality can be arranged. As the light diffusing plate 50, for example, a prism sheet having a cylindrical shape on its surface and a laminated integrated article of a light diffusing plate (for example, described in Japanese Patent Laid-Open Publication No. 2006-284697) It is also possible to use an optical sheet in which other functions are combined with the same light diffusion function.

Such a liquid crystal display device of the present invention uses the liquid crystal panel of the present invention, and the improvement of the mechanical strength is realized in the same manner as the liquid crystal panel, and the warping of the panel is improved. Further, the liquid crystal display device of the present invention is not limited to the configuration shown in Fig. 1, and various modifications can be added. For example, as described above, the optical compensation film 23 and / or the optical compensation film 33 are not necessarily required and may be omitted. In place of the optical compensation film 23 and / or the optical compensation film 33, a protective film may be used.

(Example)

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. In the examples,% and parts representing the content or amount are based on the weight unless otherwise specified.

[Production Example 1] Production of polarizing film

A polyvinyl alcohol film having an average degree of polymerization of about 2,400 and a degree of saponification of 99.9 mol% or more and having a thickness of 75 탆 was immersed in pure water at 30 캜 and then immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.02 / Respectively. Thereafter, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 12/5/100 at 56.5 ° C. Subsequently, the film was washed with pure water at 8 占 폚 and dried at 65 占 폚 to obtain a polarizing film in which iodine was adsorbed and oriented on polyvinyl alcohol. The stretching was carried out mainly in iodine dyeing and boric acid treatment steps, and the total stretching magnification was 5.3 times.

[Production Example 2] Production of acrylic resin film

, 70 parts of a copolymer of methyl methacrylate / methyl acrylate = 96/4 (weight ratio), and acrylic rubber particles (first layer: a copolymer of methyl methacrylate and allyl methacrylate (Weight ratio 99.8 / 0.2) / second layer: copolymer of butyl acrylate, styrene and allyl methacrylate (weight ratio 79/19/2) / third layer: copolymer of methyl acrylate and ethyl acrylate (weight ratio 96/4) ) Of 30 parts, an acrylic resin film having a thickness of 80 mu m was produced by melt extrusion.

[Production Example 3] Production of a flame-retardant film (A)

(Reaction product of hexamethylene diisocyanate and pentaerythritol triacrylate) in a weight ratio of 60/40 in ethyl acetate to a solid content concentration of 60%, and a leveling agent Was used as the ultraviolet ray curable resin composition. This ultraviolet ray curable resin composition exhibits a refractive index of 1.53 after curing.

After 5 parts of methyl methacrylate / styrene copolymer resin particles having a weight-average particle diameter of 2.7 占 퐉 and a refractive index of 1.57 were added to the ultraviolet-curable resin composition and dispersed in 100 parts of the ultraviolet-curable resin composition (binder component) Ethyl acetate) was added so that the concentration of the resin particles was 30%.

The acrylic resin film of Production Example 2 was coated on the acrylic resin film so that the coating film thickness after drying of the coating solution was 3.4 占 퐉 and dried in a drier set at 60 占 폚 for 3 minutes. A hard coat layer having a concavo-convex surface on the surface thereof was irradiated with light from a high-pressure mercury lamp having a strength of 20 mW / cm 2 so as to have a horn converted light quantity of 200 mJ / cm 2 from the ultraviolet ray- Retardation film (A) composed of an acrylic resin film having a layer (thickness: 3.4 mu m) was obtained.

The haze value of the repellent film (A) was measured using a haze meter &quot; HM-150 &quot;, manufactured by Murakami Color Research Laboratory Co., Ltd. in accordance with JIS K 7136, and found to be 20.1%. Further, in the measurement of the haze, in order to prevent the warpage of the antifogging film (A), an acrylic resin film of the antifogging film (A) is attached to the glass substrate so that the uneven surface becomes the surface by using an optically transparent pressure- Measurement.

&Lt; Example 1 >

(a) Preparation of Backside Polarizer

On one side of the polarizing film obtained in Production Example 1, the acrylic resin film (thickness 80 占 퐉) obtained in Production Example 2 was subjected to corona treatment on its adhered surface, and then adhered via an adhesive. On the opposite surface of the polarizing film, an optical compensation film (thickness 68 mu m, in-plane retardation value 63 nm, thickness retardation value 225 nm) made of biaxially oriented norbornene resin was subjected to corona treatment on its adhered surface, To obtain a back side polarizing plate. The optical compensation film made of biaxially stretched norbornene resin was attached so that its slow axis was perpendicular to the stretching axis of the polarizing film. Next, a pressure-sensitive adhesive (thickness: 25 mu m) layer was formed on the surface of the biaxially stretched norbornene optical compensation film of the back side polarizing plate.

(b) Preparation of front polarizer

On one side of the polarizing film obtained in Production Example 1, the anti-glare film (A) obtained in Production Example 3 was attached via an adhesive, and on the opposite side of the polarizing film, saponified triacetylcellulose film 3 nm, retardation value in the thickness direction: 50 nm) was adhered via an adhesive to obtain a front polarizing plate. And a pressure-sensitive adhesive (thickness: 25 mu m) layer was formed on the triacetylcellulose film surface of the front polarizing plate.

(c) Production of liquid crystal panel and liquid crystal display device

Polarizers on both sides of the liquid crystal cell were peeled from a liquid crystal cell of a commercially available liquid crystal television ("LC-42GX1W" manufactured by Sharp Corporation) equipped with a liquid crystal display element of a vertically aligned mode and the back surface Side polarizing plate was placed on the front surface of the liquid crystal cell so that the absorption axis of the polarizing plate was aligned with the absorption axis direction of the polarizing plate originally attached to the liquid crystal television, Thereby forming a liquid crystal panel. Next, this liquid crystal panel was assembled by the backlight / light diffusion plate / diffusion sheet / diffusion sheet / brightness enhancement sheet ("DBEF" manufactured by 3M Corporation) / liquid crystal panel to manufacture a liquid crystal display device. In this liquid crystal display device, since the warpage of the liquid crystal panel is prevented, it is possible to avoid the contact with the brightness enhancement sheet resulting from the warp, thereby preventing color unevenness. Further, the surface of the polarizing plate on the front side (hard coat layer surface) of the liquid crystal panel is not easily scratched.

&Lt; Comparative Example 1 &

A front polarizing plate was produced in the same manner as in Example 1 except that the acrylic resin film of Production Example 2 which had no hard coat layer was used in place of the light-blocking film (A) in the production of the front polarizing plate, The display device was assembled. The surface of the polarizing plate (acrylic resin film surface) on the front side of the liquid crystal panel was rubbed with a cloth, and it was easy to scratch.

[Production Example 4] Production of a flame-retardant film (B)

(Reaction product of hexamethylene diisocyanate and pentaerythritol triacrylate) in a weight ratio of 60/40 in ethyl acetate to a solid content concentration of 60%, and a leveling agent Was used as the ultraviolet ray curable resin composition. This ultraviolet ray curable resin composition exhibits a refractive index of 1.53 after curing.

After 5 parts of methyl methacrylate / styrene copolymer resin particles having a weight-average particle diameter of 2.7 占 퐉 and a refractive index of 1.57 were added to the above ultraviolet-curing resin composition and dispersed in 100 parts of the ultraviolet-curable resin composition (binder component) (Containing resin particles) of 30% by weight was added to prepare a coating liquid.

, 70 parts of a copolymer of methyl methacrylate / methyl acrylate = 96/4 (weight ratio), and acrylic rubber particles (first layer: a copolymer of methyl methacrylate and allyl methacrylate (Weight ratio 99.8 / 0.2) / second layer: copolymer of butyl acrylate, styrene and allyl methacrylate (weight ratio 79/19/2) / third layer: copolymer of methyl acrylate and ethyl acrylate (weight ratio 96/4) ) Of 30 parts, an acrylic resin film having a thickness of 80 mu m was produced by melt extrusion. This acrylic resin film was coated on the acrylic resin film so that the coating film thickness after drying of the coating liquid was 3.4 占 퐉 and dried in a drier set at 60 占 폚 for 3 minutes. A hard coat layer having a concavo-convex surface on the surface thereof was irradiated with light from a high-pressure mercury lamp having a strength of 20 mW / cm 2 so as to have a horn converted light quantity of 200 mJ / cm 2 from the ultraviolet ray- Retardation film (B) comprising an acrylic resin film having a layer (thickness: 3.4 mu m) was obtained.

The haze value of the repellent film (B) was measured using a haze meter "HM-150" manufactured by Murakami Color Research Laboratory Co., Ltd. in accordance with JIS K 7136, and found to be 20.1%. Further, in the measurement of haze, in order to prevent the warpage of the antifogging film (B), the acrylic resin film of the antifogging film (B) is attached to the glass substrate so that the uneven surface becomes the surface by using an optically transparent pressure- Measurement.

[Production Example 5] Production of flame-retardant film (C)

(C) was produced in the same manner as in Production Example 4 except that the coating liquid (the ultraviolet-curable resin composition containing the resin particles) was applied on the acrylic resin film so that the thickness of the hard coat layer was 30 占 퐉 Respectively. The haze value of the light-shielding film (C) was measured by the above-mentioned measurement method and found to be 20%.

&Lt; Example 2 >

(a) Preparation of Backside Polarizer

A uniaxially stretched polyethylene terephthalate film (thickness: 40 mu m) was subjected to corona treatment on one side of the polarizing film obtained in Production Example 1, and then adhered via an adhesive.

An optical compensation film (thickness 68 mu m, in-plane retardation value 63 nm, thickness direction retardation value 225 nm) made of a biaxially oriented norbornene resin was corona-treated on the opposite surface of the polarizing film, To obtain a back side polarizing plate. The optical compensation film made of a monoaxially stretched polyethylene terephthalate film and a biaxially stretched norbornene resin was attached so that their slow axis was perpendicular to the stretching axis of the polarizing film.

Next, a pressure-sensitive adhesive (thickness: 25 mu m) layer was formed on the surface of the biaxially stretched norbornene-based optical compensation film of the back side polarizing plate.

(b) Preparation of front polarizer

The retardation film (B) obtained in Production Example 4 was attached to one side of the polarizing film obtained in Production Example 1 via an adhesive. On the opposite side of the polarizing film, a saponified triacetylcellulose film (thickness: 80 mu m, 3 nm, retardation value in the thickness direction: 50 nm) was adhered via an adhesive to obtain a front polarizing plate. And a pressure-sensitive adhesive (thickness: 25 mu m) layer was formed on the triacetylcellulose film surface of the front polarizing plate.

(c) Production of liquid crystal panel and liquid crystal display device

Polarizers on both sides of the liquid crystal cell were peeled from a liquid crystal cell of a commercially available liquid crystal television ("LC-42GX1W" manufactured by Sharp Corporation) equipped with a liquid crystal display element of a vertically aligned mode and the back surface Side polarizing plate was placed on the front surface of the liquid crystal cell so that the absorption axis of the polarizing plate was aligned with the absorption axis direction of the polarizing plate originally attached to the liquid crystal television, Thereby forming a liquid crystal panel. Next, this liquid crystal panel was assembled with a backlight / light diffusion plate / prism sheet ("BEF" manufactured by 3M Company) / brightness enhancement sheet ("DBEF" manufactured by 3M) / liquid crystal panel, . For this liquid crystal display device, the color unevenness (interference nonuniformity) when viewed from the front and oblique directions was small. Further, as a result of rubbing the surface of the polarizing plate on the front side (hard coat layer surface) of the liquid crystal panel with a cloth, scratches were hard to occur.

&Lt; Example 3 >

A front polarizing plate was produced in the same manner as in Example 1 except that the retardation film (C) obtained in Preparation Example 5 was used as the retardation film of the front polarizing plate, and the liquid crystal display was assembled. For this liquid crystal display device, the color unevenness (interference nonuniformity) when viewed from the front and oblique directions was small. Further, as a result of rubbing the surface of the polarizing plate on the front side (hard coat layer surface) of the liquid crystal panel with a cloth, scratches were hard to occur.

&Lt; Comparative Example 2 &

A front polarizing plate was produced in the same manner as in Example 1 except that an acrylic resin film (thickness 80 탆) in which a hard coat layer was not formed was used in place of the antireflective film (B) in the production of the front polarizing plate And the liquid crystal display device was assembled. For this liquid crystal display device, the color unevenness (interference non-uniformity) when viewed from the front and oblique directions was large and visibility was low. Further, when the surface of the polarizing plate on the front side (acrylic resin film surface) of the liquid crystal panel was rubbed with a cloth, scratches easily occurred.

It is to be understood that the embodiments and examples disclosed herein are by no means intended to be limiting in all respects. It is intended that the scope of the invention be indicated by the appended claims rather than the foregoing description, and that all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

10: Backlight,
20: first polarizer plate,
21: first polarizing film,
23, 33: optical compensation film,
25: stretched polyethylene terephthalate film,
25 ': acrylic resin,
30: second polarizer plate,
31: second polarizing film,
34: repellent film,
35: acrylic resin film,
36: hard coat layer,
40: liquid crystal cell,
50: light diffuser plate

Claims (7)

A polarizing plate set for a liquid crystal panel comprising a first polarizing plate and a second polarizing plate,
Wherein the first polarizing plate has a first polarizing film made of a polyvinyl alcohol resin and a transparent protective film laminated on one surface of the first polarizing film,
The second polarizing plate has a second polarizing film made of a polyvinyl alcohol resin and a retardation film laminated on one surface of the second polarizing film and having a haze value in a range of 0.1% or more and 45% or less,
Wherein the light-shielding film comprises an acrylic resin film and a hard coat layer having a thickness of 2 to 30 占 퐉 laminated on a surface opposite to the second polarizing film side of the acrylic resin film. The method according to claim 1,
Wherein the transparent protective film in the first polarizing plate is a stretched polyethylene terephthalate film or an acrylic resin film. 3. The method of claim 2,
Wherein the first polarizing plate further has an optical compensation film or a protective film laminated on the surface opposite to the surface on which the stretched polyethylene terephthalate film or the acrylic resin film in the first polarizing film is laminated. The method according to claim 2 or 3,
Wherein the second polarizing plate further has an optical compensation film or a protective film laminated on a surface of the second polarizing film opposite to the surface on which the retardation film is laminated. A liquid crystal panel using the polarizing plate set of claim 1,
Wherein the first polarizing plate, the liquid crystal cell, and the second polarizing plate are arranged in this order,
The first polarizing plate is disposed such that a surface opposite to the surface on which the stretched polyethylene terephthalate film or the acrylic resin film in the first polarizing film is laminated is opposed to the liquid crystal cell,
And the second polarizing plate is disposed such that a surface of the second polarizing film opposite to the surface on which the retardation film is stacked faces the liquid crystal cell. A backlight, a light diffusion plate, and a liquid crystal panel according to claim 5 in this order,
Wherein the liquid crystal panel is arranged such that the first polarizing plate is opposed to the light diffusing plate. A backlight, a light diffusion plate, a brightness enhancement sheet, and a liquid crystal panel according to claim 5 in this order,
Wherein the liquid crystal panel is arranged so that the first polarizing plate is opposed to the brightness enhancing sheet.

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