KR20190124699A - Liquid crystal panel and liquid crystal display - Google Patents

Abstract

The present invention is the liquid crystal cell (C) of the IPS mode, the first optical functional layer (A1) and the first polarizing film (P1) sequentially arranged from the viewing side of the liquid crystal cell (C), and the liquid crystal cell (C) In the liquid crystal panel having a second optical function layer (A2) and a second polarizing film (P2) sequentially arranged from the back side of the back), the first optical function layer (A1) and the second optical function layer (A2) At least any one of the optical function layers contains a pigment | dye, and haze exists in the range of 0.2 to 2%, It is characterized by the above-mentioned. The liquid crystal panel of the present invention not only realizes a wide color gamut and low reflectance, but also satisfies high contrast.

Description

Liquid crystal panel and liquid crystal display

The present invention relates to a liquid crystal panel. The liquid crystal panel may form a liquid crystal display device. The said liquid crystal panel and a liquid crystal display device can be applied to various uses, For example, it can be used with input devices, such as a touch panel applied at the visual recognition side of a liquid crystal display device. As said touch panel, it can use suitably for touch panels, such as an optical system, an ultrasonic system, a capacitive system, and a resistive film system. In particular, it is used suitably for a capacitive touch panel. The touch panel is not particularly limited, but is used in, for example, a cellular phone, a tablet computer, a portable information terminal, and the like.

The liquid crystal display device is indispensable to arrange | position a polarizing element on both surfaces of a liquid crystal cell by the image formation system, and the polarizing film is generally affixed. When attaching the said polarizing film to a liquid crystal cell, an adhesive is used normally. In addition, in order for adhesion | attachment of a polarizing film and a liquid crystal cell, each material is closely adhered using an adhesive in order to reduce the loss of light. In such a case, since it has the merit of not requiring a drying process in order to fix a polarizing film, the adhesive is generally used the polarizing film with an adhesive layer previously formed as an adhesive layer on the single side | surface of a polarizing film.

In recent years, brightness and clarity (that is, wide color gamut) have been demanded for an image display device, and an organic EL display device (OLED) has attracted attention, but wide color gamut has also been required for a liquid crystal display device. For example, as a method of wide-color gamuting a liquid crystal display device, a polarizing film is provided on one side or both sides of the liquid crystal cell via an adhesive layer containing a dye having an absorption maximum wavelength in a specific wavelength (560-610 nm) range. Laminated liquid crystal panels are proposed (Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 2011-039093 Japanese Patent Publication No. 2014-092611

Since the said liquid crystal panel generally has a high reflectance, reduction of a reflectance is calculated | required. As a result of the present inventors examining the liquid crystal panel of patent documents 1 and 2, although the said liquid crystal panel obtained the advantage of the reflectance fall in addition to the expansion of a gamut, the fall of contrast was seen.

An object of the present invention is to provide a liquid crystal panel having a liquid crystal cell and a polarizing film and using a optical functional layer containing a dye, which not only realizes a wide color gamut and a low reflectance but also satisfies high contrast. do. Moreover, an object of this invention is to provide the liquid crystal display device using the said liquid crystal panel.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to solve the said subject, the present inventors found the liquid crystal panel provided with the polarizing film which has the liquid crystal cell of the following specific mode, and the pigment | dye containing optical function layer of predetermined haze, and completes this invention. Reached.

That is, the present invention, the liquid crystal cell of the IPS mode,

A first optical function layer and a first polarizing film sequentially arranged from the viewing side of the liquid crystal cell,

In the liquid crystal panel which has a 2nd optical function layer and a 2nd polarizing film sequentially arrange | positioned from the back side of the said liquid crystal cell,

At least one of the said 1st optical function layer and the 2nd optical function layer contains a pigment | dye, and haze exists in the range of 0.2 to 2%, It is related with the liquid crystal panel characterized by the above-mentioned.

In the above liquid crystal panel, it is preferable that at least the first optical function layer contains a dye, and the haze is in the range of 0.3 to 2%.

In the said liquid crystal panel, it is preferable that haze of the optical function layer containing the said pigment is 0.2%-1.5%.

In the liquid crystal panel, a dye having a maximum absorption wavelength in at least one of the wavelength range of 470 to 510 nm and the wavelength range of 570 to 610 nm can be used.

In the liquid crystal panel, the dye may be a tetraaza porphyrin-based dye.

In the said liquid crystal panel, it is preferable to contain 0.01-5 weight part of said pigment | dyes with respect to 100 weight part of base polymers which form the resin layer of the said optical function layer.

Moreover, this invention relates to the liquid crystal display device characterized by the said liquid crystal panel being used.

(Effects of the Invention)

In the liquid crystal panel of this invention, the optical function layer containing a pigment | dye is used for bonding of a liquid crystal cell and a polarizing film. The said optical function layer can adjust the hue of the whole liquid crystal display device by absorbing the light of some wavelengths with a pigment | dye, and can improve the sharpness by wide color gamut. In particular, a dye having a maximum absorption wavelength in at least one of the wavelength range 470 to 510 nm and the wavelength range 570 to 610 nm is a wavelength range other than RGB (wavelength range 470 to 510 nm and / or wavelength range 570 to 610 nm). It is possible to absorb luminescence unnecessary for color expression in and to suppress the unnecessary luminescence, which is effective for wide color gamut.

Moreover, in the liquid crystal panel of this invention, since the optical function layer used on at least one side of a liquid crystal cell has a pigment | dye, it is generally considered that the reflectance reduction can be carried out in addition to the wide gamut of a liquid crystal panel, but pigment | dye and optical functional layer formation If the compatibility of the material is poor, haze rises in the optical functional layer. And it turned out that the light-diffusion by the haze of an optical function layer affects a liquid crystal panel, reducing the contrast of a liquid crystal panel and raising a reflectance. On the other hand, it turned out that the influence on the contrast which haze exerts with respect to a liquid crystal panel also changes with the mode of a liquid crystal cell. For example, in the liquid crystal panel using the liquid crystal cell of VA mode, it turned out that the influence on the contrast of the haze of an optical function layer is large. On the other hand, in the liquid crystal cell of IPS mode, the influence on the contrast of the haze of an optical function layer was small compared with VA mode. According to the present invention, even when haze occurs, the optical function layer in which the haze generated by containing a dye in the optical functional layer is controlled in a range of 0.2 to 2% with respect to the liquid crystal cell of the IPS mode having a small influence on contrast. By applying this, not only a wide color gamut and a low reflectance can be realized but also a high contrast liquid crystal panel (IPS mode) can be obtained.

Moreover, in the liquid crystal panel of this invention, since the liquid crystal panel which has a structure as mentioned above is used, haze can be made very small in the optical function layer in which the pigment | dye is melt | dissolving enough, and a polarization characteristic is not largely eliminated, In addition, since the polarization direction is controlled by the small haze of the light distribution inherent in the liquid crystal panel, the low reflectance and the high contrast can be satisfied while maintaining the polarization degree and transmittance of the liquid crystal panel.

1 is a cross-sectional view showing an embodiment of a liquid crystal panel of the present invention.

Embodiment of the liquid crystal panel of this invention is described below, referring drawings. 1 is a cross-sectional view showing an embodiment of a liquid crystal panel of the present invention. The liquid crystal panel of FIG. 1 is a liquid crystal cell (C) of IPS mode, the 1st optical function layer (A1) and the 1st polarizing film (P1) which were arrange | positioned sequentially from the visual recognition side of the said liquid crystal cell (C), and It has the 2nd optical function layer A2 and the 2nd polarizing film P2 which were arrange | positioned sequentially from the back side of liquid crystal cell C. FIG.

Below, each member of the liquid crystal panel of this invention is demonstrated.

<Liquid crystal cell>

The liquid crystal cell of the IPS mode is used for the liquid crystal cell C (the structure of a glass substrate / liquid crystal layer / glass substrate). In addition, in the case of TN mode, STN mode, VA mode, etc. other than IPS type mode, the influence that the haze of an optical function layer has on these liquid crystal cells is large, and control of contrast is difficult.

As the liquid crystal layer of the liquid crystal cell (C), a liquid crystal layer containing homogeneous alignment of liquid crystal molecules in a state where no electric field exists is used. It is preferable that a liquid crystal molecule uses a nematic liquid crystal. The liquid crystal cell (C) has a structure in which the liquid crystal layer is sandwiched between two transparent substrates. The inside or outside of a liquid crystal cell can take the form of a liquid crystal panel with a touch sensing function. Further, a color filter substrate can be provided on the liquid crystal cell (transparent substrate on the viewing side). As a material which forms the said transparent substrate, glass or a polymer film is mentioned, for example.

<Optical functional layer>

The optical function layer of this invention will not be specifically limited if it is a resin layer. A film layer, an adhesive layer, etc. are mentioned as said resin layer. The optical functional layer may be formed of a composition containing a base polymer. The optical functional layer containing a pigment | dye can be formed from the composition containing a base polymer and a pigment | dye. As the first optical functional layer and the second optical functional layer of the present invention, a film layer, an adhesive layer, and the like are used, but the first optical functional layer and the second optical functional layer may be the same optical functional layer, The optical function layer may be sufficient. In addition, the 1st optical function layer and the 2nd optical function layer of this invention can be formed with the optical function layer of multiple layers of the same kind or different types.

In the first optical functional layer and the second optical functional layer of the present invention, at least either optical functional layer contains a dye, and a haze of 0.2 to 2% is used. Although the said 1st optical function layer and the 2nd optical function layer have a pigment | dye in any one or both, and the haze can use it in the range of 0.2-2%, From a viewpoint which low reflectance also satisfy | fills high contrast, it is at least It is preferable that a 1st optical function layer contains a pigment | dye, and haze exists in 0.2 to 2% of range. In addition, when forming the 1st optical functional layer and the 2nd optical functional layer of this invention with the optical functional layer of the same kind or different types, at least 1 layer of multiple layers contains a pigment | dye, and haze Use in the range of 0.2 to 2%.

Although the haze of the optical function layer which has the said pigment | dye was the thing controlled by 0.2 to 2% of range, It is preferable that the said haze is 0.2 to 1.5%, It is preferable that it is 0.2 to 1.2%, Furthermore, 0.2 to 1% Is preferably. When the haze of the optical function layer which has the said pigment | dye is less than 0.2%, since there is no micro polarization control by haze, it is hard to say that the contrast advantage with respect to the past is high. On the other hand, when the haze of the optical function layer which has the said pigment | dye exceeds 2%, contrast of a liquid crystal panel cannot be maintained. When the haze of the optical function layer containing the said dye is especially controlled in 0.2 to 1.5% of range, contrast can be improved, making a haze high compared with the optical function layer which does not have a dye.

Moreover, when the optical function layer (the haze is 0.2 to 2% range) which has the said pigment | dye is used for either the said 1st optical function layer or the 2nd optical function layer of this invention, the other optical function If the haze of the layer is high, the contrast of the liquid crystal panel is affected. Therefore, it is preferable to use an optical functional layer having no pigment or an optical functional layer having a pigment (the haze is less than 0.2%) in the other optical functional layer. desirable.

Adjustment of the haze (0.2-2%) of the optical functional layer which has the said pigment | dye can be performed by controlling the selection of the kind of pigment | dye, content of a pigment | dye, and thickness of an optical functional layer.

<Color>

Various pigment | dyes can be used for the pigment | dye which the optical function layer of this invention can contain. As a pigment | dye, various compounds, such as a tetraaza porphyrin type, a porphyrin type, a cyanine type, an azo type, a pyrromethene type, a squarylium type, a xanthene type, an oxonol type, a squaraine type, are mentioned, for example. From the viewpoint of photochromic region, the dye is preferably a tetraaza porphyrin dye, a porphyrin dye, a cyanine dye, a squalar dye, or a squaraine dye, and particularly a tetraaza porphyrin dye. The said dye is specifically disclosed by Unexamined-Japanese-Patent No. 2011-116818. 1 type of said pigments may be used and may use 2 or more types together.

It is preferable that the said dye has maximum absorption wavelength in at least one of wavelength range 470-510 nm and wavelength range 570-610 nm. The pigment | dye which has the maximum absorption wavelength in the said wavelength range can absorb the light emission which is unnecessary for color expression, and can suppress that light emission, and is effective for wide color gamut. As a pigment | dye which has the maximum absorption wavelength in the said wavelength range, a tetraaza porphyrin type pigment | dye can be used suitably. For example, as a pigment | dye which shows the maximum absorption wavelength in a wavelength range of 570-610 nm, the tetraaza porphyrin type compound (brand name: PD-320, PD311) by Yamamoto Kasei Co., Ltd. and the tetraaza porphyrin type compound by Yamada Kagaku Kogyo Co., Ltd. make, for example. (Brand name: FDG-007) etc. are mentioned. In addition, the maximum absorption wavelength of a pigment | dye is measured with the spectrophotometer (V-570 by Nippon Bunko Corporation).

Although content of the pigment in the optical function layer of this invention is adjusted by the absorption wavelength range of a pigment | dye, an extinction coefficient, and the kind of base polymer, 100 weight of base polymers are generally from a viewpoint of coexistence of photochromic region and control of a haze. It is preferable that it is 0.01-5 weight part with respect to a part, 0.05-3 weight part is preferable, and also 0.1-1 weight part is preferable. Especially when using a tetraaza porphyrin type pigment | dye, the said range is preferable.

<Adhesive layer>

An adhesive layer is mentioned as an optical function layer of this invention. The pressure-sensitive adhesive layer may be formed of an adhesive composition containing an adhesive base polymer. Although there is no restriction | limiting in particular about the kind of adhesive base polymer, For example, a rubber type polymer, a (meth) acrylic type polymer, a silicone type polymer, a urethane type polymer, a vinyl alkyl ether type polymer, a polyvinyl alcohol type polymer, a polyvinylpyrrolidone type polymer And various polymers such as polyacrylamide polymers and cellulose polymers.

The adhesive composition of this invention contains an adhesive base polymer as a main component. A main component refers to the component with the highest content rate among the total solids contained in an adhesive composition, For example, it is a component which occupies more than 50 weight% of the total solids contained in an adhesive composition, and also occupies more components than 70 weight% Point.

Among these adhesive base polymers, those having excellent optical transparency, exhibiting moderate wettability, cohesiveness and adhesive adhesion characteristics, and excellent in weather resistance, heat resistance, and the like are preferably used. As showing such a characteristic, a (meth) acrylic-type polymer is used preferably. Hereinafter, the acrylic adhesive which uses the (meth) acrylic-type polymer which contains the alkyl (meth) acrylate as a monomer unit which is a formation material of an adhesive layer as a base polymer is demonstrated.

<(Meth) acrylic polymer>

The said (meth) acrylic-type polymer normally contains alkyl (meth) acrylate as a main component as a monomer unit. In addition, (meth) acrylate refers to acrylate and / or methacrylate, and has the same meaning as (meth) of this invention.

As an alkyl (meth) acrylate which comprises the main skeleton of the said (meth) acrylic-type polymer, the C1-C18 thing of a linear or branched alkyl group can be illustrated. These may be used alone or in combination. It is preferable that the average carbon number of these alkyl groups is 3-9.

Moreover, alkyl (meth) acrylate containing aromatic rings, such as phenoxyethyl (meth) acrylate and benzyl (meth) acrylate, can be used from the point of adhesion characteristic, durability, adjustment of phase difference, adjustment of refractive index, etc. have.

In the (meth) acrylic polymer, at least one copolymerization monomer having a polymerizable functional group having an unsaturated double bond such as a (meth) acryloyl group or a vinyl group is introduced by copolymerization for the purpose of improving adhesiveness and heat resistance. can do. As a specific example of such a copolymerization monomer, (meth) acrylic-acid 2-hydroxyethyl, (meth) acrylic-acid 3-hydroxypropyl, (meth) acrylic-acid 4-hydroxybutyl, (meth) acrylic acid 6-hydroxyhexyl Hydroxyl groups such as (meth) acrylic acid 8-hydroxyoctyl, (meth) acrylic acid 10-hydroxydecyl, (meth) acrylic acid 12-hydroxylauryl or (4-hydroxymethylcyclohexyl) -methylacrylate Containing monomers; Carboxyl group-containing monomers such as (meth) acrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid and crotonic acid; Acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; Caprolactone adducts of acrylic acid; Sulfonic acid group containing styrene sulfonic acid, allyl sulfonic acid, 2- (meth) acrylamide-2-methylpropanesulfonic acid, (meth) acrylamide propanesulfonic acid, sulfopropyl (meth) acrylate, (meth) acryloyloxy naphthalene sulfonic acid, etc. Monomers; Phosphoric acid group containing monomers, such as 2-hydroxyethyl acryloyl phosphate, etc. are mentioned.

Furthermore, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-butyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methylol propane (meth) acrylamide, etc. (N-substituted) amide monomers; (Meth) acrylic-acid alkylaminoalkyl-type monomers, such as amino ethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, and t-butylaminoethyl (meth) acrylate; (Meth) acrylic acid alkoxyalkyl monomers such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate; N- (meth) acryloyloxymethylene succinimide, N- (meth) acryloyl-6-oxyhexamethylene succinimide, N- (meth) acryloyl-8-oxyoctamethylene succinimide, N Succinimide-based monomers such as acryloyl morpholine; Maleimide monomers such as N-cyclohexyl maleimide, N-isopropyl maleimide, N-lauryl maleimide and N-phenyl maleimide; N-methyl itaconimide, N-ethyl itaconimide, N-butyl itaconimide, N-octyl itaconimide, N-2-ethylhexyl itaconimide, N-cyclohexyl itacon Itaconic imide type monomers, such as mead and N-lauryl itaconimide, etc. are mentioned as a monomer example for the purpose of modification.

Moreover, as a modified monomer, vinyl acetate, a vinyl propionate, N-vinylpyrrolidone, a methylvinylpyrrolidone, a vinylpyridine, a vinylpiperidone, a vinylpyrimidine, a vinylpiperazine, a vinylpyrazine, a vinylpyrrole, a vinylimidazole, Vinyl monomers such as vinyloxazole, vinyl morpholine, N-vinylcarboxylic acid amides, styrene, α-methylstyrene, and N-vinyl caprolactam; Cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; Epoxy group-containing acrylic monomers such as glycidyl (meth) acrylate; Glycol-based acrylic ester monomers such as polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, methoxyethylene glycol (meth) acrylate, and methoxypolypropylene glycol (meth) acrylate; Acrylic acid ester system monomers, such as (meth) acrylic acid tetrahydrofurfuryl, a fluorine (meth) acrylate, silicone (meth) acrylate, and 2-methoxyethyl acrylate, can also be used. Moreover, isoprene, butadiene, isobutylene, vinyl ether, etc. are mentioned.

Moreover, the silane type monomer containing a silicon atom etc. are mentioned as a monomer copolymerizable other than the above. Examples of the silane monomers include 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, and 4-vinylbutyltriethoxysilane. -Vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyl Triethoxysilane, 10-acryloyl oxydecyl triethoxysilane, etc. are mentioned.

Moreover, as a copolymerization monomer, a tripropylene glycol di (meth) acrylate, a tetraethylene glycol di (meth) acrylate, a 1, 6- hexanediol di (meth) acrylate, and a bisphenol A diglycidyl ether di (meth) Acrylate, neopentyl glycol di (meth) acrylate, trimethylol propane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate And unsaturated double such as (meth) acryloyl groups such as esters of (meth) acrylic acid and polyhydric alcohols such as dipentaerythritol hexa (meth) acrylate and caprolactone-modified dipentaerythritol hexa (meth) acrylate (Meth) acryl as a functional group such as a monomer component in a skeleton such as a polyfunctional monomer having two or more bonds or polyester, epoxy, urethane, etc. Polyester (meth) acrylate, epoxy (meth) acrylate, urethane (meth) acrylate, etc. which added two or more unsaturated double bonds, such as a diary and a vinyl group, can also be used.

Although the said (meth) acrylic-type polymer has an alkyl (meth) acrylate as a main component in the weight ratio of all the constituent monomers, the ratio of the said copolymerization monomer in a (meth) acrylic-type polymer is not specifically limited, The ratio of the said copolymerization monomer It is preferable that it is about 0 to 20%, about 0.1 to 15%, and about 0.1 to 10% in the weight ratio of all the constituent monomers.

Among these copolymerization monomers, hydroxyl group-containing monomers and carboxyl group-containing monomers are preferably used from the viewpoint of adhesion and durability. A hydroxyl group containing monomer and a carboxyl group containing monomer can be used together. These copolymerization monomers become reaction points with a crosslinking agent, when an adhesive composition contains a crosslinking agent. Since a hydroxyl group containing monomer, a carboxyl group containing monomer, etc. are rich in reactivity with an intermolecular crosslinking agent, they are used preferably for the improvement of the cohesiveness and heat resistance of the adhesive layer obtained. The hydroxyl group-containing monomer is preferable in view of reworkability, and the carboxyl group-containing monomer is preferable in view of both durability and reworkability.

When a hydroxyl group containing monomer is contained as said copolymerization monomer, the ratio is preferably 0.01 to 15% by weight, more preferably 0.03 to 10% by weight, still more preferably 0.05 to 7% by weight. When a carboxyl group-containing monomer is included as said copolymerization monomer, 0.05-10 weight% is preferable, as for the ratio, 0.1-8 weight% is more preferable, 0.2-6 weight% is more preferable.

As for the (meth) acrylic-type polymer of this invention, the thing of the range of 500,000-3 million is used normally. In consideration of durability, especially heat resistance, it is preferable to use a weight average molecular weight of 700,000 to 270 million. Moreover, it is preferable that they are 800,000-2,500,000. If the weight average molecular weight is less than 500,000, it is not preferable in terms of heat resistance. Moreover, when a weight average molecular weight becomes larger than 3 million, a large amount of dilution solvent is needed in order to adjust to the viscosity for apply | coating, and since it will become a cost increase, it is unpreferable. In addition, a weight average molecular weight is measured by GPC (gel permeation chromatography) and says the value computed by polystyrene conversion.

In the production of such a (meth) acrylic polymer, a known production method such as radiation polymerization such as solution polymerization or UV polymerization, bulk polymerization, emulsion polymerization or various radical polymerization can be appropriately selected. In addition, any of a random copolymer, a block copolymer, a graft copolymer, etc. may be sufficient as the obtained (meth) acrylic-type polymer.

In solution polymerization, for example, ethyl acetate, toluene or the like is used as the polymerization solvent. As a specific solution polymerization example, reaction is added under an inert gas stream, such as nitrogen, and a polymerization initiator is usually performed at 50-70 degreeC about 5 to 30 hours of reaction conditions.

A polymerization initiator, a chain transfer agent, an emulsifier, etc. used for radical polymerization are not specifically limited, It can select suitably and can use. In addition, the weight average molecular weight of a (meth) acrylic-type polymer can be controlled by the usage-amount of a polymerization initiator, a chain transfer agent, and reaction conditions, and the appropriate usage-amount is adjusted according to these types.

As the radical polymerization initiator, for example, 2,2'-azobisisobutylonitrile, 2,2'-azobis (2-amidinopropane) dihydrochloride, 2,2'-azobis [2- (5 -Methyl-2-imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis (2-methylpropionamidine) disulfate, 2,2'-azobis (N, N'- Azo initiators, such as dimethylene isobutyl amidine) and 2,2'- azobis [N- (2-carboxyethyl) -2-methylpropion amidine] hydrate (made by Wako Pure Chemical Industries, Ltd., VA-057); Persulfates such as potassium sulfate and ammonium persulfate, di (2-ethylhexyl) peroxydicarbonate, di (4-t-butylcyclohexyl) peroxydicarbonate, di-sec-butylperoxydicarbonate, t-butylperoxy Neodecanoate, t-hexyl peroxy pivalate, t-butyl peroxy pivalate, dilauroyl peroxide, di-n-octanoyl peroxide, 1,1,3,3-tetramethylbutyl peroxy- 2-ethylhexanoate, di (4-methylbenzo Peroxide initiators such as peroxide, dibenzoyl peroxide, t-butyl peroxy isobutylate, 1,1-di (t-hexyl peroxy) cyclohexane, t-butyl hydroperoxide, hydrogen peroxide, and persulfate; Although redox type initiator which combined peroxide and a reducing agent, such as the combination of sodium hydrogen sulfite and the combination of a peroxide and sodium ascorbate, etc. are mentioned, It is not limited to these.

Although the said radical polymerization initiator may be used independently and may mix and use 2 or more types, it is preferable that content as a whole is about 0.005-1 weight part with respect to 100 weight part of monomers, and is about 0.02-0.5 weight part It is more preferable.

As the chain transfer agent, for example, lauryl mercaptan, glycidyl mercaptan, mercaptoacetic acid, 2-mercaptoethanol, thioglycolic acid, thioglycolic acid 2-ethylhexyl, 2,3-dimercapto-1 Propanol etc. are mentioned. Although a chain transfer agent may be used independently and may be used in mixture of 2 or more type, content as a whole is about 0.1 weight part or less with respect to 100 weight part of whole quantities of a monomer component.

Moreover, as an emulsifier used at the time of emulsion polymerization, sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, ammonium polyoxyethylene alkyl ether sulfate, sodium polyoxyethylene alkyl phenyl ether sulfate, etc. are mentioned, for example. And nonionic emulsifiers such as anionic emulsifiers, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene fatty acid esters, and polyoxyethylene-polyoxypropylene block polymers. These emulsifiers may be used independently and may use 2 or more types together.

Moreover, as an emulsifier into which radically polymerizable functional groups, such as a propenyl group and an allyl ether group, were introduce | transduced as a reactive emulsifier, For example, Aquaron HS-10, HS-20, KH-10, BC-05, BC -10, BC-20 (above, all made by Daiichi Kogyo Seiyaku Co., Ltd.), and Adeka Riasov SE10N (Asahi Denka High School Co., Ltd.). Since the reactive emulsifier is introduced into the polymer chain after polymerization, the water resistance is good, which is preferable. As for the usage-amount of an emulsifier, 0.5-1 weight part is more preferable from 0.3-5 weight part, polymerization stability, and mechanical stability with respect to 100 weight part of whole quantities of a monomer component.

<Bridge school>

Moreover, in this invention, a crosslinking agent can be contained in the adhesive composition which forms an adhesive layer. As the crosslinking agent, an organic crosslinking agent or a polyfunctional metal chelate can be used. As an organic type crosslinking agent, an isocyanate type crosslinking agent, a peroxide type crosslinking agent, an epoxy type crosslinking agent, an imine type crosslinking agent, etc. are mentioned. A polyfunctional metal chelate is a thing in which a polyvalent metal is covalently bonded or coordinated with an organic compound. Examples of the polyvalent metal atoms include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti, and the like. have. Examples of the atoms in the organic compound covalently or coordinating include oxygen atoms, and examples of the organic compound include alkyl esters, alcohol compounds, carboxylic acid compounds, ether compounds, ketone compounds, and the like.

Examples of the compound according to the isocyanate-based crosslinking agent include isocyanate monomers such as tolylene diisocyanate, chlorphenylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, and the like. Isocyanate compounds, isocyanurates, biuret compounds, polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols, and the like, with addition of these isocyanate monomers to trimethylolpropane and the like Isocyanate etc. are mentioned. Especially preferably, it is a polyisocyanate compound and is 1 type selected from the group which consists of hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, and isophorone diisocyanate, or polyisocyanate compound derived from it. Here, hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, iso is used for 1 type or polyisocyanate compound derived from it selected from the group which consists of hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, and isophorone diisocyanate. Poron diisocyanate, polyol modified hexamethylene diisocyanate, polyol modified hydrogenated xylylene diisocyanate, trimer-type hydrogenated xylylene diisocyanate, polyol modified isophorone diisocyanate, and the like. The exemplified polyisocyanate compound is preferable because the reaction with the hydroxyl group proceeds rapidly, particularly with the acid and the base contained in the polymer as a catalyst.

The peroxide can be suitably used as long as it generates radically active species by heating or light irradiation to advance the crosslinking of the base polymer of the pressure-sensitive adhesive composition. However, in view of workability and stability, the half-life temperature is 80 ° C to 160 ° C for 1 minute. It is preferable to use a peroxide, and it is more preferable to use a peroxide which is 90 degreeC-140 degreeC.

Examples of the peroxide include di (4-t-butylcyclohexyl) peroxydicarbonate (1 minute half-life temperature: 92.1 ° C), di-sec-butylperoxydicarbonate (1 minute half-life temperature: 92.4 ° C), t Butyl peroxy neodecanoate (1 minute half-life temperature: 103.5 ° C.), t-hexyl peroxy pivalate (1 minute half-life temperature: 109.1 ° C.), t-butyl peroxy pivalate (1 minute half-life temperature: 110.3 ° C.) ), Dilauroyl peroxide (1 minute half-life temperature: 116.4 ° C.), di-n-octanoyl peroxide (1 minute half-life temperature: 117.4 ° C.), 1,1,3,3-tetramethylbutylperoxy-2 Ethylhexanoate (1 minute half-life temperature: 124.3 ° C), di (4-methylbenzoyl) peroxide (1 minute half-life temperature: 128.2 ° C), dibenzoylperoxide (1 minute half-life temperature: 130.0 ° C), t- Butyl peroxy isobutylate (1 minute half life temperature: 136.1 degreeC), 1,1-di (t-hexyl peroxy) cyclohexane (1 minute half life temperature: 149.2 degreeC) etc. are mentioned. Among them, di (4-t-butylcyclohexyl) peroxydicarbonate (1 minute half-life temperature: 92.1 ° C), dilauroyl peroxide (1 minute half-life temperature: 116.4 ° C), di Benzoyl peroxide (1 minute half life temperature: 130.0 degreeC) etc. are used preferably.

In addition, the half-life of a peroxide is an index which shows the decomposition rate of a peroxide, and means the time until the residual amount of a peroxide becomes half. The decomposition temperature for obtaining the half life at an arbitrary time and the half life time at an arbitrary temperature are described in the manufacturer's catalog and the like, for example, Nippon Yushi Co., Ltd. "Organic Peroxide Catalog 9th Edition (2003) May) ”and the like.

As for the usage-amount of the said crosslinking agent, 20 weight part or less is preferable with respect to 100 weight part of base polymers, such as a (meth) acrylic-type polymer, In addition, 0.01-20 weight part is preferable, and 0.03-10 weight part is preferable. Moreover, when the said crosslinking agent is more than 20 weight part, moisture resistance will not be enough and peeling will arise easily in a reliability test etc.

Moreover, the adhesive composition which forms the adhesive layer of this invention can contain a silane coupling agent. By using a silane coupling agent, durability can be improved. Specific examples of the silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 2- (3 Epoxy-group containing silane coupling agents, such as, 4-epoxy cyclohexyl) ethyl trimethoxysilane, 3-aminopropyl trimethoxysilane, N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, and 3-tri Amino group-containing silane coupling agents such as ethoxy silyl-N- (1,3-dimethylbutylidene) propylamine and N-phenyl-γ-aminopropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3 Isocyanate group containing silane coupling agents, such as (meth) acryl group containing silane coupling agents, such as -methacryloxypropyl triethoxysilane, and 3-isocyanate propyl triethoxysilane, etc. are mentioned.

Although the said silane coupling agent may be used independently and may mix and use 2 or more types, content as a whole is 0.001-5 weights of said silane coupling agents with respect to 100 weight part of base polymers, such as said (meth) acrylic-type polymers, Addition is preferable, Furthermore, 0.01-1 weight part is preferable, Furthermore, 0.02-1 weight part is more preferable, Furthermore, 0.05-0.6 weight part is preferable. It is an amount which improves durability and maintains adhesive force to optical members, such as a liquid crystal cell, suitably.

Moreover, in this invention, polyether modified silicone can be mix | blended in the adhesive composition which forms an adhesive layer. As polyether modified silicone, what is disclosed by Unexamined-Japanese-Patent No. 2010-275522 can be used, for example.

In addition, in the present invention, other well-known additives may be contained in the adhesive composition which forms an adhesive layer, For example, powder, such as a coloring agent and a pigment, dye, surfactant, a plasticizer, a tackifier, a surface lubricant, Leveling agents, softeners, antioxidants, antioxidants, light stabilizers, ultraviolet absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, particulates, thin substances and the like can be appropriately added. Moreover, you may employ | adopt the redox system which added the reducing agent within the range which can be controlled.

Although an adhesive layer is formed by the said adhesive composition, in formation of an adhesive layer, while adjusting the addition amount of a crosslinking agent, it is preferable to fully consider the influence of crosslinking process temperature and crosslinking process time.

Depending on the crosslinking agent to be used, the crosslinking treatment temperature and the crosslinking treatment time can be adjusted. It is preferable that crosslinking process temperature is 170 degrees C or less.

In addition, such crosslinking process may be performed at the temperature at the time of the drying process of an adhesive layer, and may be performed by providing a crosslinking process process separately after a drying process.

The crosslinking treatment time can be set in consideration of productivity and workability, but is usually about 0.2 to 20 minutes, preferably about 0.5 to 10 minutes.

As a method of forming an adhesive layer, for example, it applies to the separator which carried out the peeling process of the said adhesive composition, dryly removes a polymerization solvent, etc., forms an adhesive layer, and transfers to a polarizing film, or the said adhesive to a polarizing film A composition is apply | coated, it is produced by the method of drying and removing a polymerization solvent etc., and forming an adhesive layer in a polarizing film. Moreover, in application | coating of an adhesive, you may add a 1 or more types of solvent other than a polymerization solvent suitably.

As a peeled separator, a silicone peeling liner is used preferably. In the process of forming an adhesive layer by apply | coating and drying the adhesive composition of this invention on such a liner, as a method of drying an adhesive, an appropriate method can be employ | adopted suitably according to the objective. Preferably, the method of overheating and drying the said coating film is used. The heat drying temperature is preferably 40 ° C to 200 ° C, more preferably 50 ° C to 180 ° C, and particularly preferably 70 ° C to 170 ° C. By setting heating temperature in the said range, the adhesive which has the outstanding adhesive characteristic can be obtained.

As for a drying time, an appropriate time can be employ | adopted. The drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.

Moreover, an adhesive layer can be formed after forming an anchor layer on the surface of a polarizing film, or performing various easy adhesion processes, such as a corona treatment and a plasma process. In addition, you may perform an easily bonding process on the surface of an adhesive layer.

Various methods are used as a formation method of the said adhesive layer. Specifically, for example, roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, die coater, etc. Methods, such as an extrusion coat method, are mentioned.

The thickness of the said adhesive layer is not specifically limited, For example, it is about 1-100 micrometers. Preferably it is 2-50 micrometers, More preferably, it is 2-40 micrometers, More preferably, it is 5-35 micrometers. It is preferable that the adhesive layer containing the said pigment | dye is 30 micrometers or less in thickness in adjusting the haze of the said adhesive layer. 28 micrometers or less are preferable and, as for the thickness of the said adhesive layer, 23 micrometers or less are preferable.

In the case where the pressure-sensitive adhesive layer is exposed, the pressure-sensitive adhesive layer may be protected by a sheet (separator) subjected to peeling treatment until it is provided for practical use.

<Film layer>

Moreover, a film layer is mentioned as an optical function layer of this invention, The said film layer can be formed from the composition containing the base polymer for film formation. As a material of the base polymer which forms a film layer, the same thing as the material which comprises the transparent protective film mentioned later can be illustrated. In particular, as the material, cellulose resins such as triacetyl cellulose, polyester resins, (meth) acrylic resins, cyclic polyolefin resins (norbornene-based resins) and the like are preferably used. The film layer can be suitably applied to a polarizing film using an adhesive agent, an adhesive, etc.

Various methods can be employ | adopted for the formation method of the film layer containing a pigment | dye. For example, when melt | dissolving the pellet of the said resin material in a solvent, a film layer can be manufactured by mixing a pigment | dye, preparing a composition, and casting or extruding the said composition. In that case, a film layer can be shape | molded to moderate thickness. In preparation of the said composition, an additive can be mix | blended suitably.

The thickness of the film layer is not particularly limited and is the same as the pressure-sensitive adhesive layer, for example, about 1 to 100 µm. Preferably it is 2-50 micrometers, More preferably, it is 2-40 micrometers, More preferably, it is 5-35 micrometers. The separator can also be applied to a film layer.

As the constituent material of the separator, for example, plastic film such as polyethylene, polypropylene, polyethylene terephthalate, polyester film, porous material such as paper, cloth, nonwoven fabric, net, foam sheet, metal foil, and laminates thereof Although suitable thin bodies, such as these, are mentioned, A plastic film is used suitably from the point which is excellent in surface smoothness.

It will not specifically limit, if it is a film which can protect the said optical function layer (especially an adhesive layer) as this plastic film, For example, a polyvinyl alcohol film, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene A film, a polymethyl pentene film, a polyvinyl chloride film, a vinyl chloride copolymer film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, an ethylene-vinyl acetate copolymer film, etc. are mentioned.

The thickness of the separator is usually 5 to 200 µm, preferably about 5 to 100 µm. The separator may also be subjected to antistatic treatment such as silicone type, fluorine type, long chain alkyl type or fatty acid amide type release agent, silica release, antifouling treatment, coating type, kneading type, vapor deposition type or the like. In particular, by appropriately performing a peeling treatment such as silicon treatment, long chain alkyl treatment, fluorine treatment or the like on the surface of the separator, the peelability from the optical functional layer (particularly the pressure-sensitive adhesive layer) can be further improved.

Moreover, when the said optical function layer is an adhesive layer, although the said adhesive layer is used at the time of bonding to a liquid crystal cell, it can be used as a polarizing film with an adhesive layer in which the adhesive layer was previously formed in the polarizing film. The peeled sheet | seat used in preparation of the polarizing film with an adhesive layer can be used as a separator of the polarizing film with an adhesive layer as it is, and the simplification in a process surface is possible.

<Polarizing film>

As a 1st polarizing film and a 2nd polarizing film of this invention, what has a transparent protective film on the single side | surface or both surfaces of the said polarizer is generally used.

The said polarizer is not specifically limited, Various things can be used. As a polarizer, the dichroic substance of iodine or a dichroic dye is made to adsorb | suck to hydrophilic polymer films, such as a polyvinyl alcohol-type film, a partially formalized polyvinyl alcohol-type film, and an ethylene-vinyl acetate copolymerization partial saponification film, And polyene oriented films such as monoaxially stretched, dehydrated polyvinyl alcohol and dehydrochloric acid treated polyvinyl chloride. Among these, the polarizer which consists of dichroic substances, such as a polyvinyl alcohol-type film and iodine, is suitable. Although the thickness in particular of these polarizers is not restrict | limited, Usually, it is about 80 micrometers or less.

The polarizer which dyed a polyvinyl alcohol-type film with iodine and uniaxially stretched can be created, for example, by dyeing a polyvinyl alcohol-type film by immersion in the aqueous solution of iodine, and extending | stretching 3 to 7 times the original length. As needed, it can also be immersed in aqueous solution, such as potassium iodide which may contain boric acid, zinc sulfate, zinc chloride, etc. If necessary, the polyvinyl alcohol-based film may be dipped in water and washed with water before dyeing. In addition to washing the polyvinyl alcohol-based film with water, the contamination of the polyvinyl alcohol-based film with the antiblocking agent can be washed, and the polyvinyl alcohol-based film is swollen to prevent unevenness such as dyeing. Stretching may be performed after dyeing with iodine, or may be performed while dyeing, or may be dyed with iodine after stretching. It can extend | stretch also in aqueous solution, such as boric acid and potassium iodide, or a water bath.

Moreover, as a polarizer, a thin polarizer whose thickness is 10 micrometers or less can be used. From the viewpoint of thinning, the thickness is preferably 1 to 7 µm. Such a thin polarizer is preferable because it has little thickness variation, excellent visibility, and small dimensional change, so that durability is excellent, and thickness of the polarizing film can be reduced.

As a thin polarizer, Unexamined-Japanese-Patent No. 51-069644, Unexamined-Japanese-Patent No. 2000-338329, WO2010 / 100917 pamphlet, the specification of PCT / JP2010 / 001460, or Japan patent application 2010-269002 The thin polarizing film described in the specification of Unexamined-Japanese-Patent No. 2010-263692, and the like are mentioned. These thin polarizing films can be obtained by the manufacturing method including the process of extending | stretching and dyeing a polyvinyl alcohol-type resin (henceforth a PVA-type resin) layer, and the extending | stretching resin base material in the state of a laminated body. If it is this manufacturing method, even if a PVA-type resin layer is thin, it is supported by the resin base material for extending | stretching, and it becomes possible to extend | stretch without problems, such as the fracture by extending | stretching.

As the thin polarizing film, WO2010 / 100917 pamphlet, PCT / JP2010 /, in that it can be stretched at a high magnification and can improve polarization performance among manufacturing methods including a step of stretching in the state of a laminate and a step of dyeing. It is preferable that it is obtained by the manufacturing method including the process of extending | stretching in the boric-acid aqueous solution as described in the specification of 001460 or the Japan patent application 2010-269002 specification, or the Japan patent application 2010-263692 specification, Especially, Japan patent application 2010-269002 It is preferable that it is obtained by the manufacturing method including the process of carrying out air | stretching auxiliary auxiliaryly before extending | stretching in the boric-acid aqueous solution as described in a specification or Unexamined-Japanese-Patent No. 2010-263692.

As a material which comprises a transparent protective film, the thermoplastic resin which is excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, etc. is used, for example. Specific examples of such thermoplastic resins include cellulose resins such as triacetyl cellulose, polyester resins, polyether sulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, cyclic Polyolefin resin (norbornene-based resin), polyarylate resin, polystyrene resin, polyvinyl alcohol resin, and mixtures thereof. In addition, a transparent protective film is bonded to one side of the polarizer by an adhesive layer, but on the other side, a thermosetting resin such as (meth) acrylic, urethane, acrylurethane, epoxy, silicone, or ultraviolet curable resin can be used as the transparent protective film. have. One or more types of arbitrary appropriate additives may be contained in the transparent protective film. As an additive, a ultraviolet absorber, antioxidant, a lubricating agent, a plasticizer, a mold release agent, a coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a coloring agent, etc. are mentioned, for example. Content of the said thermoplastic resin in a transparent protective film becomes like this. Preferably it is 50-100 weight%, More preferably, it is 50-99 weight%, More preferably, it is 60-98 weight%, Especially preferably, it is 70-97 weight% . When content of the said thermoplastic resin in a transparent protective film is 50 weight% or less, there exists a possibility that the high transparency etc. which a thermoplastic resin originally has cannot fully be expressed.

The thickness of a transparent protective film is not specifically limited, For example, it is about 10-90 micrometers. Preferably it is 15-60 micrometers, More preferably, it is 20-50 micrometers.

A functional layer (surface layer) such as a hard coat layer, an antireflection layer, an anti-sticking layer, a diffusion layer or an antiglare layer can be formed on the surface of the transparent protective film that is not adhered to the polarizer.

The adhesive used for bonding the polarizer and the transparent protective film is not particularly limited as long as it is optically transparent, and various types of water-based, solvent-based, hot-melt, radical-curable, and cation-curable types can be used. Suitable.

<LCD panel>

The liquid crystal panel of this invention is arrange | positioned sequentially from the liquid crystal cell of an IPS mode, the 1st optical function layer and the 1st polarizing film which were arrange | positioned sequentially from the visual recognition side of the said liquid crystal cell, and the back side of the said liquid crystal cell as mentioned above. And a second optical functional layer and a second polarizing film. In addition to the polarizing film, other optical layers may be applied to the formation of the liquid crystal panel. Although there is no limitation in particular about the optical layer, For example, liquid crystal panels, such as a reflecting plate, a semi-transmissive plate, a retardation plate (including wavelength plates, such as 1/2 and a quarter), a visual compensation film, a brightness enhancement film, etc. One layer or two or more layers can be used for the optical layer which may be used for formation at the visual recognition side and / or the back side of a liquid crystal cell.

<Liquid crystal display device>

The liquid crystal panel is used for a liquid crystal display device, and is formed by assembling a component such as an illumination system appropriately and mounting a drive circuit as necessary. In the formation of the liquid crystal display device, for example, a suitable component such as a diffusion plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusion plate, a backlight, or the like may be used in one layer or two. It can be arranged in layers or more. Moreover, a suitable liquid crystal display device, such as using a backlight or a reflecting plate, can be formed for an illumination system.

(Example)

Although an Example demonstrates this invention concretely below, this invention is not limited by these Examples. In addition, all the parts and% in each case are a basis of weight. The room temperature standing conditions which are not specifically defined below are all 23 degreeC 65% RH.

<Measurement of the weight average molecular weight of the (meth) acrylic polymer>

The weight average molecular weight (Mw) of the (meth) acrylic-type polymer was measured by GPC (gel permeation chromatography). Also about Mw / Mn, it measured similarly.

Analysis device: manufactured by Tosoh Corporation, HLC-8120GPC

Column: manufactured by Tosoh Corporation, G7000H _XL + GMH _XL + GMH _XL

Column size: each 7.8mmφ × 30cm total 90cm

Column temperature: 40 ℃

Flow rate: 0.8 mL / min

Injection volume: 100 μL

Eluent: tetrahydrofuran

Detector: Differential Refractometer (RI)

Standard sample: polystyrene

Comparative Example 1

<Production of Polarizing Film>

In order to manufacture a thin polarizing layer, first, the laminated body by which the 9 micrometer-thick PVA layer was formed on the amorphous PET base material was produced by air auxiliary extension | stretching of extending | stretching temperature of 130 degreeC, and then the stretched laminated body is A colored laminate is produced by dyeing, and the colored laminate comprises a 4 μm-thick PVA layer integrally stretched with an amorphous PET substrate such that the total stretch ratio is 5.94 times by boric acid underwater stretching at a stretching temperature of 65 ° C. An optical film laminate was produced. By such two-stage stretching, the PVA molecules of the PVA layer formed on the amorphous PET substrate are highly ordered, and the iodine adsorbed by dyeing constitutes a high-functional polarizing layer in which the iodine adsorbed by dyeing is highly ordered in one direction as the polyiodine ion complex. An optical film laminate comprising a 4 μm PVA layer could be produced. Further, while applying a polyvinyl alcohol-based adhesive to the surface of the polarizing layer of the optical film laminate, after bonding the saponified 40 μm thick acrylic resin film, the amorphous PET substrate is peeled off to use a polarizing film using a thin polarizer. Made. This is called a thin polarizing film.

<Preparation of (meth) acrylic polymer>

A monomer mixture containing 100 parts of butyl acrylate, 0.01 part of 2-hydroxyethyl acrylate, and 5 parts of acrylic acid was introduced into a reaction vessel equipped with a cooling tube, a nitrogen introduction tube, a thermometer, and a stirring device. Further, 0.1 part of 2,2'-azobisisobutylonitrile was added together with 100 parts of ethyl acetate as a polymerization initiator with respect to 100 parts of the monomer mixture, nitrogen gas was introduced with gentle stirring, and nitrogen was substituted. The polymerization was carried out for 8 hours while maintaining the liquid temperature at about 55 ° C to prepare a solution (solid content concentration of 30% by weight) of an acrylic polymer having a weight average molecular weight (Mw) of 1.8 million and Mw / Mn = 4.1.

(Preparation of Adhesive Composition)

With respect to 100 parts of solid content of the acryl-type polymer solution manufactured above, 0.3 part of benzoyl peroxides (brand name Nyper BMT by Nippon Yushi Corporation) and 1 part of isocyanate type crosslinking agents (trade name Coronate L by Tosoh Corporation) are mix | blended, and it is an adhesive composition Got.

(Production of Polarizing Film with Adhesive Layer)

The pressure-sensitive adhesive composition was applied to the surface of the release substrate (MRF38CK manufactured by Mitsubishi Juicy Co., Ltd.) of the polyethylene terephthalate film treated with a silicone release agent uniformly with an applicator, and dried by drying in an air circulation type constant temperature oven at 155 ° C. for a thickness of 20. A pressure-sensitive adhesive layer was formed. The polarizing film with an adhesive layer which transferred the adhesive layer which has the said pigment | dye to the surface of the polarizer (PVA layer) of the said thin polarizing film was produced.

(Production of liquid crystal panel of IPS mode)

The liquid crystal panel (liquid crystal panel containing the liquid crystal cell of IPS mode) was taken out from the liquid crystal TV (43UF7710) by LG Electronics, and the polarizing film with an adhesive layer of the visual recognition side was further removed from the liquid crystal cell. After peeling a separator from the adhesive layer of the polarizing film with an adhesive layer produced above to the part of the liquid crystal cell which removed the said polarizing film with an adhesive layer, the adhesive layer of the said polarizing film with an adhesive layer is pasted, and the liquid crystal panel of IPS mode is Made.

Example 1

In the preparation of the pressure-sensitive adhesive composition of Comparative Example 1, tetraaza porphyrin-based dye (trade name PD-320 manufactured by Yamamoto Kasei Co., Ltd., having a maximum absorption wavelength at a wavelength of 595 nm) 0.25 with respect to 100 parts of solid content of the acrylic polymer solution 0.25 Except having mix | blended parts, the polarizing film with an adhesive layer was produced like Example 1, and also the liquid crystal panel of IPS mode was produced using the said polarizing film with an adhesive layer.

Example 2

In the preparation of the pressure-sensitive adhesive composition of Comparative Example 1, a tetraaza porphyrin-based dye was further added to 100 parts by weight of the acrylic polymer solution, trade name FDG-007 manufactured by Yamada Kagaku Kogyo Co., Ltd. (having a maximum absorption wavelength at a wavelength of 595 nm). Except having mix | blended 0.5 part, the polarizing film with an adhesive layer was produced like Example 1, and also the liquid crystal panel of IPS mode was produced using the said polarizing film with an adhesive layer.

Comparative Example 2

In the preparation of the pressure-sensitive adhesive composition of Example 1, 0.25 parts of cyanine dye (trade name FDB-008 made by Yamada Kagaku Co., Ltd .: having a maximum absorption wavelength at a wavelength of 495 nm) is blended with 100 parts of solid content of the acrylic polymer solution. A polarizing film with a pressure-sensitive adhesive layer was produced in the same manner as in Example 1 except that the liquid crystal panel of IPS mode was produced using the polarizing film with pressure-sensitive adhesive layer.

Reference Comparative Example 1

(Polarization film with retardation film)

In the preparation of the polarizing film of Comparative Example 1, after the thin polarizing film was produced, a retardation film (zeonoa film, manufactured by Nippon Xeon, manufactured by Nippon Zeon Co., Ltd.) with a polyvinyl alcohol-based adhesive on the polarizer surface of the thin polarizing film. Retardation 52 nm, thickness retardation 125 nm) were affixed, and the polarizing film with retardation film was produced.

(Production of Polarizing Film with Adhesive Layer)

Next, using the adhesive composition similar to the comparative example 1, the adhesive layer was formed in the retardation film side of the polarizing film with retardation film similarly to the comparative example 1, and the adhesive layer (with retardation film) polarizing film was produced.

(Production of liquid crystal panel of VA mode)

The liquid crystal panel (liquid crystal panel containing the liquid crystal cell of VA mode) was taken out from the liquid crystal TV (UN48JU6350F) by Samsung Corporation, and the polarizing film with an adhesive layer of the visual recognition side was further removed from the liquid crystal cell. After peeling a separator from the adhesive layer of the adhesive layer with an adhesive layer produced above (with a phase difference film) polarizing film produced above, the polarizing film with an adhesive layer (with a phase difference film) of the polarizing film was removed. The adhesive layer was stuck and the liquid crystal panel of VA mode was produced.

Reference Comparative Example 2

In Reference Comparative Example 1, 0.25 parts of porphyrin-based dye (trade name PD-320 manufactured by Yamamoto Kasei Co., Ltd .: having a maximum absorption wavelength at a wavelength of 595 nm) was added to 100 parts of the solid polymer of the acrylic polymer solution as the pressure-sensitive adhesive composition. A polarizing film with a pressure-sensitive adhesive layer (with a retardation film) was produced in the same manner as in Reference Comparative Example 1 except that a polarizing film with a pressure-sensitive adhesive layer (with a retardation film) was produced.

The following evaluation was performed about the adhesive layer and liquid crystal panel obtained by the said Example and comparative example (including a comparative reference example). The evaluation results are shown in Table 1.

(Measurement of haze (internal haze) of the adhesive layer)

The pressure-sensitive adhesive composition used in each example was uniformly coated with an applicator on one side of an alkali-free glass having a total light transmittance of 93.3% and a haze of 0.1%, followed by drying for 2 minutes in an air-circulating constant temperature oven at 155 ° C, having a thickness of 20 μm. The haze was measured by the haze meter (Murakami Color Technology Research Institute, MH-150) which formed the adhesive layer. In the measurement by a haze meter, it arrange | positioned so that an adhesive layer side might become a light source side. Since the haze value of the alkali free glass was 0.1%, the haze value made the value which subtracted 0.1% from the measured value as a haze value.

(Measurement of contrast of liquid crystal panel)

After returning the liquid crystal panel produced by each example to the original liquid crystal TV, the front luminance at the time of black display and white display of the liquid crystal TV in a dark room is SR-UL1 made by a color luminance meter (Topcon Techno House Co., Ltd.). ) Was measured. The contrast was calculated from (luminance at white display / luminance at black display). In Table 1, it shows also about the index (%) of contrast at the time of using the adhesive layer which does not have a pigment | dye (Comparative example 1, reference comparative example 1) as 100%.

(Measurement of the reflectance of the liquid crystal panel)

About the liquid crystal panel produced by each case, it measured by the S65 method containing a specular reflection with a D65 light source using the brand name "CM-2600d" by Konica Minolta. The measurement temperature was 23 degreeC. The average value of two times of repetition was made into the measured value.

C: liquid crystal cell in IPS mode
A1: first optical functional layer
A2: second optical functional layer
P1: first polarizing film
P2: second polarizing film

Claims (7)

Liquid crystal cell in IPS mode,
A first optical functional layer and a first polarizing film sequentially arranged from the viewing side of the liquid crystal cell,
In the liquid crystal panel which has a 2nd optical function layer and a 2nd polarizing film sequentially arrange | positioned from the back side of the said liquid crystal cell,
At least one of the said 1st optical function layer and the 2nd optical function layer contains a pigment | dye, and haze exists in the range of 0.2 to 2%, The liquid crystal panel characterized by the above-mentioned. The method of claim 1,
At least a 1st optical function layer contains a pigment | dye, and haze exists in the range of 0.2 to 1.5%, The liquid crystal panel characterized by the above-mentioned. The method according to claim 1 or 2,
The haze of the optical function layer containing the said pigment is 0.2 to 2%, The liquid crystal panel characterized by the above-mentioned. The method according to any one of claims 1 to 3,
The said pigment | dye has maximum absorption wavelength in at least one of wavelength range 470-510 nm and wavelength range 570-610 nm, The liquid crystal panel characterized by the above-mentioned. The method according to any one of claims 1 to 4,
The said pigment is a tetraaza porphyrin type pigment | dye, The liquid crystal panel characterized by the above-mentioned. The method according to any one of claims 1 to 5,
0.01-5 weight part of said pigment | dyes are contained with respect to 100 weight part of base polymers which form the resin layer of the said optical function layer, The liquid crystal panel characterized by the above-mentioned. The liquid crystal panel in any one of Claims 1-6 is used, The liquid crystal display device characterized by the above-mentioned.

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