TW201217841A - Adhesion type polarizing plate and image display device - Google Patents

Abstract

To provide an adhesion type polarizing plate hardly causing the light escaping of an image display device even if a use environment is changed, and to provide the image display device using the same. In the adhesion type polarizing plate 10 formed by laminating a transparent protective film 2 at least on one surface of a polarizer 1 and laminating an adhesive layer 5 on the surface of the transparent protective film which the polarizer 1 is not laminated on, the adhesive layer is formed of an adhesive containing an acryl based polymer containing alkyl (metha) acylate and (metha) acrylate having an aromatic ring structure as monomer units. When the photoelastic coefficient of the transparent protective film is expressed by X m<SP>2</SP>/N and the content of the (metha) acrylate monomer unit having the aromatic ring structure in the acryl based polymer is expressed by Y%, it is necessary to satisfy a prescribed relation between X and Y for solving the problem.

Description

[Technical Field] The present invention relates to an adhesive type polarizing plate having a wide adhesive layer in at least a single-layer layer of a polarizing plate, and an image display device using the same. [Prior Art]

The liquid crystal display device i has a configuration in which a liquid crystal panel in which at least one side of the liquid crystal cell has a polarizing plate and a light source such as a backlight is combined. Usually, the liquid crystal cell and the polarizing plate are laminated via an adhesive layer. Further, in the organic EL (Electro-Luminescence) display device, in order to shield the specular reflection of the light, the circular polarizing plate is bonded to the viewing side of the unit via the adhesive layer. When the image display device of the above (4) light panel is used for actual use, especially when it is used in a high-temperature, high-humidity environment, light leakage may occur at the end portion of the screen. It is considered that the above-mentioned environmental changes due to changes in temperature, humidity, and the like are caused by the following reasons, that is, the dimensional changes of the respective members, and the phase difference of the members constituting the polarizing plate is changed due to the stress at the interface . That is, the reason for this is considered to be that the polarizing plate usually has a configuration in which a transparent protective film is laminated on the polarizing element via an adhesive, but the interface between the transparent protective film and the polarizing element and the transparent protection as the environment changes. The interface between the film and other members bonded to the transparent protective film generates stress, and the phase difference of the transparent protective film changes sharply due to the photoelastic birefringence caused by the stress. In particular, at the end of the screen, since the dimensional change of each member is larger than that in the middle portion of the screen, there is a tendency that the light leakage at the end becomes conspicuous. In addition, with the trend of increasing the size and brightness of image display devices in recent years, there is a tendency that the temperature inside the image display device rises due to heat generation of the light source. Further, there is a diversified use of a thin image display device such as a liquid crystal display device or an organic EL display device, and the chance of being used in a severe environment such as high temperature and high humidity tends to increase. Therefore, light leakage at the end of the kneading surface accompanying environmental changes is more easily recognized. In view of suppressing light leakage at the end of the screen, a method of reducing the phase difference of the transparent protective film by using a transparent protective film having a small absolute value of the photoelastic coefficient has been proposed (for example, Patent Document). Further, it has been proposed to reduce the difference in tensile elastic modulus between the mechanical direction and the direction perpendicular to the mechanical direction in the production of the transparent protective film (for example, Patent Document 2), or to increase the coefficient of linear expansion and adhesion of the transparent protective film. The method of reducing the phase difference of the transparent protective film by setting the product of the elastic modulus of the agent layer to a specific range (for example, Patent Documents 3 and 4). [PRIOR ART DOCUMENT] [Patent Document 1] Japanese Laid-Open Patent Publication No. 2000-352619 (Patent Document 2) Japanese Patent Laid-Open Publication No. Hei No. Hei. No. Hei. [Problems to be Solved by the Invention] As described in Patent Document 1 and the like, the environment is reduced as described in Patent Document 1 and the like. In view of the change in the phase difference of the transparent protective film and the suppression of light leakage at the end of the screen, it is preferable that the absolute value of the photoelastic purity of the protective film is small, and it is considered that the light is used by using light. A transparent protective film with a modulus of elasticity of approximately zero eliminates the problem of light leakage. According to the study by the inventors of the present invention, it is clarified that even when a transparent protective film having a small absolute value of the photoelastic coefficient is used, light leakage at the end of the screen accompanying the change in the use environment occurs. In view of the above problems, the object of the present invention is to provide a kind of

It is also difficult to produce an adhesive polarizing plate for leaking light of an image display device, and an image display device using the same. [Means for Solving the Problem] The inventors of the present invention have studied the cause of light leakage when using a transparent protective film having a small photoelastic coefficient, and found the following new findings: by changing the laminated polarizing plate and The type of the adhesive layer of the liquid crystal cell can change the condition of light leakage. In addition, from this point of view, the research is based on the following estimation principle, that is, the light leakage in the use environment of the image display device is not only caused by the phase difference change of the transparent protective film, but also due to the phase difference of the adhesion system, and it is found that The present invention can be completed by suppressing light leakage by a combination of a specific transparent protective film and an adhesive layer. The present invention relates to an adhesive type polarizing plate in which at least a single-layer layer of a polarizing element is provided with a transparent protective film, and an adhesive layer is laminated on a side of the transparent protective film which is not laminated with the polarizing element. The above adhesive layer is formed of an adhesive containing an acrylic polymer containing an alkyl (meth)acrylate and a (meth)acrylic acid hydride having an aromatic ring structure as a monomer unit. The absolute value of the photoelastic coefficient X (m2/N) of the above two transparent protective films is 5 〇 xl 〇 -12 or less. Further, when the content of the (yinyl) acrylate monomer unit having an aromatic ring structure in the acrylic polymer 156468.doc 201217841 constituting the above adhesive layer is Y%, X and Y satisfy the following formula. -1xlOnX+3S Υ^-1χ1〇πχ+23 In the adhesive polarizing plate of the present invention, the transparent protective film preferably contains an acrylic resin, a cyclic anthraquinone resin, and a phenyl maleicene. At least one of a group consisting of an imide resin, a cellulose resin, and a modified polycarbonate resin. Further, the present invention relates to an image display device using the above-described adhesive polarizing plate. [Effect of the Invention] In the adhesive polarizing plate of the present invention, the acrylic polymer constituting the adhesive layer contains a specific amount of a (fluorenyl) acrylate monomer unit (ruthenium component) having an aromatic ring structure. The content γ of the 8 component can be determined according to the value of the photoelastic coefficient X of the transparent protective film. When the phase difference of the transparent protective film changes due to environmental changes such as heating, the adhesive layer can be produced and transparently protected. The phase difference of the opposite sign of the film is changed in such a manner as to change. According to the above configuration, the phase difference of the adhesive layer is also changed in the vicinity of the written end portion where the phase difference of the transparent protective film is largely changed (wherein the phase difference of the adhesive layer changes with the phase difference of the transparent protective film) The sign is reversed. 'In the entire surface of the adhesive polarizing plate, the phase difference of the transparent protective film changes and the phase difference of the adhesive layer cancels each other. Therefore, the image display device to which the adhesive polarizing plate of the present invention is bonded can realize image display with less light leakage even when exposed to a heating environment or the like. [Embodiment] 156468.doc 201217841 Hereinafter, the present invention will be described with reference to the drawings. As shown in the figure, the adhesive polarizing plate 10 of the present invention comprises a first transparent protective film 2 on one side of a polarizing element, and an adhesive layer 5 on the transparent protective film 2. The polarizing element 1 and the first transparent protective film 2 are laminated via an adhesive layer (not shown). Further, it is preferable that the second transparent protective film 0 is laminated on the surface on the side opposite to the side on which the second transparent protective film 2 is laminated on the polarizing element 经由 via the adhesive layer (not shown) in the adhesive-type polarizing film using the present invention. In the case where the image display device 100 is formed by the plate 10, as shown in FIG. 2, the surface on the side where the second transparent protective film 2 is disposed is bonded to the image display unit 2 via the adhesive layer 5. That is, the first transparent protective film and the adhesive layer 5 are disposed between the image display unit 2A and the polarizing element. Furthermore, in Fig. 2, the image display unit 2 is bonded to both sides of the display unit 2

The polarizing plate may be attached to the single side of the image display unit 2 to adhere the adhesive polarizing plate. [Polarizing Element; I The polarizing element 1 is not particularly limited, and various types can be used. Examples of the polarizing element include iodine and a color on a hydrophilic polymer film such as a polyethylene glycol film, a partially condensed polyethylene glycol film, or a partially saponified film of ethylene/vinyl acetate copolymer. A dichroic substance such as a dye, and a uniaxially stretched product, a dehydrated material of a polyethylene material, and a dechlorination treatment of a polyvinyl chloride: a polyene-based alignment film or the like, preferably containing a polyethylene glycol Membrane and: polarizing element of coloring matter. These polarizing elements are not limited, and are usually about 5 to 80 μηι. ..., especially to break the polyethyl _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The dyeing was carried out and extended to 3 to 7 times the original length. If necessary, it may be impregnated with lysate or may be contained in an aqueous solution containing sulphuric acid, chlorinated or the like. Further, if necessary, the polyethylene glycol film may be immersed in water and washed with water. By washing the polyvinyl alcohol-based film with water, the surface of the polyethylene-based medium can be washed with dirt or an anti-caking agent, and the polyethylene film can be swollen to prevent unevenness such as uneven dyeing. The extension may be carried out after the dyeing, or may be extended on the side of the dyeing, and may also be dyed after the stretching. It can also be extended in an aqueous solution or water bath such as rotten acid or hydrazine. [Transparent protective film] As the i-th transparent protective film 2 disposed on one main surface of the polarizing element, the absolute value of the photoelastic coefficient can be 5 〇 xl 〇 12 m 2 /N or less. If the photoelastic coefficient is too large, stress is applied to the first protective film, which tends to cause unevenness in image display. Further, the photoelastic coefficient can be used to determine the phase difference value when a specific tension is applied to the film, and is obtained by plotting the slope of the stress and the phase difference. Regarding the sign of the photoelastic coefficient, when the tensile stress is given, the phase difference increase is defined as positive, and the phase difference decrease is defined as negative. (Material) The material for forming the m-th protective film is not particularly limited as long as the photoelastic coefficient is in the above range, and is preferably excellent in transparency, mechanical strength, thermal stability, water barrier, isotropy and the like. As a material for forming the m-th protective film, a cyclic polyfluorene-based tree can be preferably used as the 'acrylic acid tree 156468.doc 201217841 modified polyester, phenyl maleimide-based resin , cellulose resin, carbonate resin, and the like.

The cyclic polyolefin-based resin is a general term for a resin obtained by polymerizing a cyclic olefin as a polymerization unit, and for example, JP-A-240517, Japanese Patent Laid-Open No. (4) described in Japanese Laid-Open Patent Publication No. Hei. The _ can be exemplified by a ring-opening (co)polymer of a cyclic olefinic smoke, an addition polymer of a cyclic (tetra) hydrocarbon, a copolymer of a cyclic rare hydrocarbon and ethylene, a propylene/dilute hydrocarbon (typically, a copolymer modified) and a graft modified product obtained by modifying the unsaturated carboxylic acid or a derivative thereof, and the like. Specific examples of the cyclic rare hydrocarbons include norbornene-based monomers. Examples of the norbornene-based monomer include norbornene, an alkyl group thereof, and/or an alkylene group-substituted product. Further, as the cyclic polyolefin-based resin, other cyclic olefins which can be subjected to ring-opening polymerization other than the above can be used in combination within the range not impairing the object of the present invention. Various products are commercially available as the above-mentioned cyclic polyolefin resin. As a specific example, the product name "Ar Ze〇nex" by JAPAN, "Zeonor", the product name "Arton" by JSR", the product name "Topas" by TICONA, and the trade name of Apei Chemical Co., Ltd. . Examples of the acrylic resin include poly(meth)acrylate such as polymethyl methacrylate, decyl methacrylate-(meth)acrylic acid copolymer, and methyl methacrylate-(mercapto). Acrylate copolymer, methyl methacrylate-acrylate-(meth)acrylic acid copolymer, (mercapto)methyl acrylate-styrene copolymer (MS resin, etc.), polymer having an alicyclic hydrocarbon group (for example) 156468.doc 201217841 Ethyl methacrylate-cyclohexyl acrylate copolymer, methyl methacrylate-(mercapto)acrylic acid norbornene copolymer, etc.). Preferably, a poly(meth)acrylic acid C1-6 alkyl ester such as poly(methyl) acrylate is used. More preferably, it is a (mercapto)methyl acrylate-based resin containing decyl (meth) acrylate as a main component (50 to 100% by weight, preferably 7 Å to 1% by weight). Specific examples of the bismuth acrylate resin include, for example, Mitsubishi Rayon.

An acrylic resin having a ring structure in a molecule, which is obtained by an intra-molecular cross-linking or an intramolecular cyclization reaction, which is described in JP-A-2004-70296, which is incorporated herein by reference. High Tg acrylic resin. Further, as the acrylic resin, a (meth)acrylic resin having a lactone ring structure can also be preferably used. The (fluorenyl) acrylic resin having a lactone ring structure is preferred in terms of higher heat resistance, higher transparency, and higher mechanical strength by biaxial stretching. Examples of the (meth)acrylic resin having a lactone ring structure include: JP-A-2000-230016, JP-A-2002-151814, and JP-A No. 2GG2-120326. A (meth)acrylic resin having a (10) ring structure described in Japanese Patent Laid-Open No. 2G 〇 2_254 M4m, Japanese Patent Laid-Open No. Hei 2 (9).乍 , , , , , , , , , , , , , , , , , , , , , 基 基 基 基 基 基 基 基 基 基 基 基 基 基 基 基 基 基 基 基 基 基 基 基 顺 顺 顺. As a phenyl ene-ene succinimide #, a raw material monomer of a resin, for example, can be listed. M a κ " exemplified · N-local succinimide, N-(2-methyl-m-) Butylene diimide, N-(2-ethylphenyl) maleimide, 156468.doc -10- 201217841 Ν_(2-propylphenyl) cis τ 浠 diimine, hydrazine Your isopropyl phenyl) cis imipenem, Ν-(2,6· dimethylphenyl)-butanedi-imine, ... : propyl phenyl) maleimide, hydrazine · (2,6·diisopropylphenyl) maleimide, fluorene-(2-methyl-6-hexyl-depleted, decyl-ethyl group) maleimide, hydrazine (2 «base) cis bis quinone imine, ν_(2,6• di-phenylene) cis-butane di-imine, Ν-(2- desert phenyl) cis-butanthine, ν_( 2,6 dimethyl phenyl) cis-butyl diimide imine, Ν-(2_biphenyl) cis-butene imine, ν_(2_ aryl benzoquinone

Base) cis ene diimine and the like. The above maleimide-based monomer can be obtained, for example, from Tokyo Chemical Industry Co., Ltd. or the like. Further, in order to improve brittleness, moldability, heat resistance and the like, the phenyl maleimide-based resin may be a compound obtained by copolymerizing a monomer other than a phenyl cis-butyl diimide-based monomer. Examples of other monomer components used for the above purpose include ethylene, propylene, butene, anthracene, 3-butadiene, 2-methyl+butadiene, 2-methylpentanthene, and dipyridamole. Dilute smoke, C: nitrile, methyl acrylate, methacrylic acid formazan, maleic anhydride, ethyl acetate vinegar, and the like. The above phenyl maleimide-dilute hydrocarbon copolymer is available, for example, from Tosoh Corporation. The cellulose resin is preferably an ester of cellulose and a fatty acid. Examples of the cellulose-based material (four) include triethyl fluorenyl cellulose, diethyl hydrazine cellulose, tripropylene fluorenyl cellulose, and dipropylene fluorenyl cellulose. Among them, it is especially preferred to be triethyl cellulose. Moreover, as a film containing a cellulose resin, a commercial item can also be used. As an example of the commercial product of the ethylene-based cellulose film, the product name "uv_5〇", "UV_80", r SH-80"'r TD_8〇u 156468, which is manufactured by Fujifilm "...FUm". Doc • 11 - 201217841 TD-TAC, "UZ-TAC", or "KC Series" by K〇nica Min〇ita. In addition to 4,4i_(propane-2,2-diyl)diphenol (bisphenol A), the bisphenol component may be a bisphenol component containing a negative birefringence as a single bisphenol component. The body unit is reduced by the photoelastic coefficient. As such a bisphenol component which exhibits a negative birefringence of the modified polycarbonate, for example, a bisphenol having a fluorene structure can be cited. As the modified polycarbonate resin, for example, Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The polycarbonate resin described in the International Publication No. Hei. As a film containing a modified polycarbonate resin, a commercial item can also be used. For the modified polycarbonate film of this type, for example, the product name "PURE-ACE WR series" manufactured by Teijin Chemical Co., Ltd. can be mentioned. The transparent protective film 2 may be substantially free of a phase film or may be an optically anisotropic film having a phase difference, but is disposed on the image display unit 2 and the polarizing element! Therefore, it is preferable that the phase difference is small and the optical uniformity is high. When an optically anisotropic film is used as the i-th transparent protective film, the second transparent protective film functions as a protective film for polarizing and functions as a phase difference plate. Example night: When the adhesive polarizing plate of the present invention is used in a display device, the first film is also used as an optical compensation mode. X, when the organic rainbow display device = the polarized plate of the present month, the circular polarizing plate can be made by using the &quot;4 wavelength plate as a protective film. ‘,··, 156468.doc -12- 201217841 The thickness of the first transparent protective film can be appropriately determined. Generally, it is about (1) and (10) in terms of workability such as strength and workability, and film properties. In particular, when the second polarizing protective film 3 is included in the adhesive polarizing plate, the second protective film is not particularly limited, but transparency, mechanical strength, thermal stability, and water blocking property are preferably used. Excellent transparent film. As the material for forming the (10)th (4th), the material which is the material for forming the first protective film can be preferably used as an example. Ο

G may be subjected to a hard coat layer or an anti-reflection treatment, anti-adhesion, diffusion or anti-glare treatment on the surface of the second transparent protective film which is not attached to the polarizing element. The antireflection layer, the anti-adhesion layer, the diffusion layer, the anti-glare layer, and the like may be provided as a transparent protective film itself. Alternatively, it may be different from the protective film. The optical layer (4) as the material and the transparent layer biasing member 1 and the transparent protective film 2, 3 are preferably laminated using an adhesive. As the adhesive, a water-based adhesive or the like can be preferably used. Examples of the subsequent agent include an isocyanate s-based adhesive, a polyethylene (10) adhesive, a gelatin-based reading, a B-transfer system, a water-based polyfilament (4), and a polyester. Further, the activation treatment was carried out by bonding the polarizing element and the transparent protective transparent protective film. Live 耵逯 can use 4 domain, corona treatment (4) various financial methods, such as [adhesive layer] low pressure uv treatment, "treatment." The adhesive layer 5 is formed of an adhesive. As the material, (meth)propionic acid and an acid polymer having a (meth)-polymerized structure having a scented scent structure can be used. Furthermore, in the scope of the propylene book and the application for patent in this (10) knives, "(A 156468.doc •13·201217841) acrylated vinegar" means "acrylate and / or methyl propyl" Dilute ester." The content γ (%) of the (fluorenyl) acrylate (component B) having an aromatic ring structure in the acrylic polymer of the above-mentioned matrix polymer is relative to the photoelastic coefficient X (m2/N) of the first transparent protective film. ), satisfy -1χΐ〇&quot;χ+3$ _1χ1〇ιιχ+23. In the present invention, the content Β of the bismuth component is set to the above range so that the absolute value of the change in the phase difference of the adhesive polarizing plate when exposed to a heating environment is reduced. The smaller the absolute value of the phase difference change of the adhesive polarizing plate, the better. Specifically, the phase difference variation is preferably within ±2 nm, and more preferably within the soil 丨nm. In this way, the (mercapto) acrylate having an aromatic ring structure in the acrylic polymer is reduced from the viewpoint of reducing the phase difference change of the adhesive polarizing plate and suppressing the light leakage at the end portion of the image display device. The content γ (%) of the component B) is preferably -1 χ 10 π Χ + 4 or more, more preferably 4 χ 1 〇 11 χ + 5 or more, and still more preferably - lxlOuX + 6 or more. Further, γ is preferably -bioux+n or less, more preferably -lxli^XMO or less, further preferably _1χ1〇11χ+19 or less. In this manner, by adjusting the content γ of the bismuth component in the acrylic polymer corresponding to the value of the photoelastic coefficient χ of the first transparent protective film, the photoelastic birefringence of the transparent protective film can be offset by the birefringence of the adhesive layer. And the phase difference of the entire adhesive polarizing plate is reduced. Further, the absolute value of the photoelastic coefficient X (m/N) of the second transparent protective film is preferably 3 〇 x 1 (more preferably rl 2 or less is 2 (^1 〇 2 or less), and further preferably 10 × 10 12 or less. The alkyl group of the alkyl (meth) acrylate (component A) in the acrylic polymer forming the adhesive layer has a carbon number of from about 1818 to about 18, preferably a carbon number, and the alkyl group may be a straight chain. —————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————— 146468.doc 14 201217841 ) propyl acrylate, isopropyl (meth) acrylate, n-butyl acrylate (meth) acrylate, isobutyl (meth) acrylate, amyl (meth) acrylate, (mercapto) acrylic acid Cool, (mercapto)acrylic acid 2-ethylhexyl ester, (mercapto)acrylic acid n-octyl vinegar, (meth)acrylic acid isooctyl ester, (mercapto) decyl acrylate, (mercapto) acrylic acid Dialkyl ester, lauryl (meth)acrylate, stearyl (meth) acrylate, etc. These may be used singly or in combination. The carbon number is preferably 4 to 12 〇Ο ^ 4 is an aromatic ring structure of the (meth) acrylate (B component) having an aromatic ring Lishi structure in the acrylic polymer of the adhesive layer. Illustrative: a naphthyl ring, a naphthalene ring, a thiophene ring, a pyridine ring, a pyrrole ring, a furan ring, etc. Examples of the (meth) acrylate having an aromatic ring structure include phenoxyethyl (meth)acrylate, Benzyl (meth) acrylate, phenoxy 2 - hydroxypropyl (meth) acrylate, phenol oxirane modified (fluorenyl) acrylate, 2 - naphthyloxyethyl (meth) acrylate, (曱2)(4-methoxynaphthyloxy)ethyl acrylate, phenoxypropyl (meth) acrylate, phenoxyethylene (meth) acrylate, thiophene (meth) acrylate, (fluorenyl) pyridyl acrylate, pyrrole (meth)acrylate, phenyl (meth)acrylate, poly(meth)acrylate, etc. • In this way, although the acrylic polymer contains a specific amount The (meth) acrylate component (component B) having an aromatic ring structure can The reason why the change in the difference of the difference is not determined is not certain, but it is presumed that the reason is that the B component has an aromatic ring structure having a high polarizability in the side chain, so that the birefringence tends to be expressed as an alkyl (meth)acrylate component. Further, the acrylic polymer constituting the adhesive may contain other monomer units (c component) as a monomer in addition to the above-mentioned A component and B, 156,468.doc •15 to 201217841 /knife. Examples of the C component include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and (mercapto)acrylic acid 6 -Hydroxyhexyl ester, 8-hydroxyoctyl (meth)acrylate, 1 〇-hydroxy decyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate or (4 hydroxy fluorenylcyclohexyl) fluorene a monomer containing a hydroxyl group such as an acrylate; (mercapto)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, and antibutene a monomer containing a carboxyl group such as acid or crotonic acid; An acid anhydride group-containing monomer such as an anhydride or itaconic anhydride; a caprolactone adduct of acrylic acid; allylsulfonic acid, 2-(meth)acrylamide _2 2 mercaptopropionic acid, a monomer having a % acid group such as acrylamide propanesulfonic acid or sulfopropyl (mercapto) acrylate, and a monomer having a phosphate group such as 2-ethylethyl propyl sulfonate. Further, the above-mentioned C component 'is a nitrogen-containing vinyl monomer. For example, the following monomer may be exemplified as a monomer for modification purposes: cis-butyl diimide, (meth) acrylamide, N,N-dimethyl(meth) acrylamide, ν, Ν -diethyl(meth)acrylamide, fluorene-hexyl (methyl) propylamine, hydrazine-methyl (methyl) propyl decylamine, hydrazine-butyl (meth) acrylamide, hydrazine - butyl (mercapto) acrylamide or hydrazine-hydroxymethyl (meth) acrylamide, hydrazine-hydroxymethylpropane (fluorenyl) acrylamide (等-substituted) guanamine monomer; Methyl)aminoethyl acrylate, aminopropyl (meth) acrylate, hydrazine (mercapto) acrylate, hydrazine-dimethylaminoethyl ester, tert-butylaminoethyl (meth)acrylate (f-based) alkylaminoalkyl acrylate-based monomer; ester (meth) methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, etc. Ester monomer; N-(fluorenyl) 】56468.doc -16· 201217841 propylene decyl sulfenyl succinimide, N_(fluorenyl) propylene fluorenyl -6-oxyhexamethylene amber Imine, N-(methyl) acrylonitrile _8_ oxygen Octamethylene Yue succinic acyl imine (PEI) succinimide-based monomers. Further, as the above-mentioned component C, vinyl acetate, ethylene propionate S曰, N-ethylene decanoic acid amide, styrene, α-mercaptostyrene, &amp; ethylene-caprolactone may also be used. a vinyl monomer such as an amine; a nitrile monomer such as acrylonitrile or methacrylonitrile; an epoxy-based acrylic monomer such as glycidyl acrylate or a polyethylene glycol (meth)acrylic acid; a glycol-based acrylate monomer such as ester, polypropylene glycol (meth) acrylonitrile, methoxyethylene glycol (meth) acrylate or methoxypolypropylene glycol (meth) acrylate; (meth) acrylate-based monomer, such as acrylate, polyfluorene (mercapto) acrylate, 2-methoxyethyl acrylate, and the like. In order to modify the matrix polymer, the above C component can be used arbitrarily. One or two or more kinds of the above C components can be used. The proportion of the component C is preferably 1% by weight or less, more preferably 6 〇% by weight or less, as the monomer unit in the acrylic polymer. If the proportion of the component C exceeds 1% by weight, the flexibility as an adhesive may be impaired. As the above-mentioned c component ', it is preferable to use a monomer containing a few groups, particularly propionate, in terms of good adhesion. When a monomer having a carboxyl group is used, the ratio is about 1 to 10% by weight, preferably 0.5 to 8% by weight, and more preferably 1 to 6% by weight. Further, since it can be a crosslinking point with the isocyanate coupling agent, a monomer having a hydroxyl group can be preferably used. In the case of using a monomer having 3 groups, the ratio is about 0.1 to 1% by weight, preferably 5% to 8% by weight, and more preferably 1 to 6% by weight. 156468.doc -17- 201217841 The above acrylic polymer can be produced by various known methods. For example, a radical polymerization method such as a bulk polymerization method, a solution polymerization method, or a suspension polymerization method can be appropriately selected. As the radical polymerization initiator, various known examples of azo-based or peroxide-based compounds can be used. The reaction temperature is usually set to about 50 to 80 ° C, and the reaction time is set to 1 to 8 hours. Further, in the above production method, a solution polymerization method is preferred as a solvent for the acrylic acid polymer, and ethyl acetate, toluene or the like can be usually used. The solution concentration is usually set to about 20 to 80% by weight. Further, the acrylic polymer can be obtained in the form of an aqueous emulsion. The weight average molecular weight of the acrylic polymer is preferably from 10,000 to 30,000. The weight average molecular weight of the acrylic polymer is more preferably from 20,000 to 30,000, and further preferably from 2.1 million to 270,000. If the weight average molecular weight is too

It is especially preferred that the heterogas acid is a crosslinking agent. The amount of the crosslinking agent to be used is preferably 〇1 to 5 parts by weight, and 100 parts by weight of the 5 parts, and 10 parts by weight, more preferably 0.02 to 3 parts by weight, based on the amount of the base polymer. I56468.doc 201217841 There is a tendency for cross-linking to proceed excessively if the proportion of the parent-linking agent is more than 1 part by weight and the adhesiveness is lowered. Adhesive-imparting agent, plasticizer, glass fiber, glass beads, metal powder, fillers containing other inorganic powders, pigments, coloring, etc. may be suitably used in the range of the present invention without departing from the object of the present invention. Various additives such as agents, fillers, antioxidants, UV absorbers, and coupling agents. Further, an adhesive layer containing fine particles and exhibiting light diffusibility may be formed.

As the above additive, a decane coupling agent is preferred. Examples of the decane coupling agent include 3-triglyceryloxypropyltrimethoxy sylvestre, 3-glycidoxypropylmethyldimethoxycarbazide, and 2 (3,4-epoxy ring). a decane coupling agent having an epoxy structure such as hexyl)ethyltrimethoxydecane; 3-aminopropyltrimethoxydecane, Ν-(2.aminoethyl)3-aminopropyltrimethoxydecane, Ν_(2_Aminoethyl) 3-aminopropyl decyl dimethoxy decane, 3-triethoxy decane (1,3-methylbutylene) propylamine, etc. a coupling agent containing a (meth) acrylonitrile group such as 3-propenyloxypropyltrimethoxy decane or 3-mercapto propylene methoxypropyltriethoxy decane; Isocyanate-containing decane coupling agent such as isocyanate propyl triethoxy decane, 3-cyclopropyltrimethoxy decane; trimethoxy decane containing acetamidine. The decane coupling agent may be used singly or in combination of two or more kinds, and the amount of the oxirane coupling agent is 0.01 to 2 parts by weight based on 1 part by weight of the acrylic polymer. 2 to 1 part by weight. [Formation of Adhesive Polarizing Plate] The adhesive polarizing plate 1 of the present invention can be produced by forming an adhesive layer using the above-mentioned adhesive on the first transparent protective film 2. Adhesive layer formation method and 156468.doc -19· 201217841 ... special limitation, can be: on the transparent protective film, casting method, such as casting method, coating method, etc., and drying method : a method of transferring by a release sheet provided with an adhesive layer or the like. The coating method may be a roll coating method such as reverse coating or gravure coating, a spin coating method, a wire coating method, a spray coating method, a dip coating method, a spray coating method, or the like. After the application of the viscous solution, the solvent is evaporated in a dry step to obtain an adhesive layer of a specific thickness. The thickness of the adhesive layer can be appropriately determined depending on the purpose of use or the adhesion, etc., and is usually 1 to 50 Å ‘, preferably 卜 (9). More preferably, it is preferably 5 to 30 μm, and more preferably 1 to 25 Å. If it is thinner than! In other words, if the durability is two, the thickness is increased, and if it is thick, it is likely to be swelled or peeled off by foaming or the like, and the appearance is liable to be poor. Further, in the formation of the adhesive layer, the acryl-based polymer can be formed by applying a υν-curable adhesive slurry (syruP) to the release film and irradiating radiation such as an electron beam or UV. Adhesive layer. At this time, since the adhesive contains a crosslinking agent, the reliability at a high temperature and the shape retention of the adhesive itself can be achieved. Further, in addition to the drying step and the uv irradiation step, the crosslinking of the adhesive layer may be selected to promote cross-linking such as crosslinking by drying in a heated state or at room temperature after drying. . Before the exposed surface of the adhesive layer 5 of the adhesive polarizing plate of the present invention is attached to an image display unit or the like for practical use, it is preferable to temporarily cover the separator for the purpose of preventing contamination of the adhesive layer or the like. . Thereby, it is possible to prevent contact with the adhesive layer under normal operation conditions. As a separator, 156468.doc • 20- 201217841 For example, a plastic film, a rubber sheet, a paper, a cloth, a non-woven fabric, a mesh, a foamed sheet or a metal foil, and a suitable sheet such as a laminate may be used. If necessary, it can be applied by a suitable release agent such as a polyoxymethylene or a long-chain alkyl group, a fluorine-based or a molybdenum sulfide, or the like based on the prior materials. - [Image display device] The adhesive type polarizing plate of the present invention can be preferably used in various image display devices such as a liquid crystal display device or a defective EL display device. The image display device of the present invention can be configured similarly to the conventional image display device except that the adhesive polarizing plate of the present invention is used. The liquid crystal display device can be manufactured by, for example, assembling an optical member such as a liquid crystal cell, an optical member such as a polarizing plate of the present invention, and an optional illumination system (such as a backlight) into a drive circuit. The configuration of the liquid crystal display device is not particularly limited as long as the adhesive polarizing plate of the present invention can be used on one side or both sides of the liquid crystal cell. For example, when a liquid crystal display device in which a polarizing plate is disposed on both the viewing side and the light source side of the liquid crystal cell, such as a transmissive liquid crystal display device, it is preferable to use both sides of the liquid crystal cell in terms of suppressing light leakage. The structure of the adhesive polarizing plate of the present invention. The organic EL display device can be manufactured, for example, by disposing the adhesive polarizing plate of the present invention on the side of the organic EL unit (organic light-emitting layer). In particular, as described above, by using the 丨/4 wavelength plate as the second transparent protective film, deterioration in visibility due to reflection of external light can be suppressed. Further, instead of using an ι/4 wavelength plate as a transparent protective film, a layer of ι/4 156468.doc •21·201217841 wavelength plate may be additionally laminated on the polarizing plate of the present invention to form a circular polarizing plate. The viewing side of the unit. The image display device of the present invention can be used in any suitable application. Examples of the use thereof include OA equipment such as desktop computers, notebook computers, and photocopiers; mobile devices such as mobile phones, clocks, digital cameras, personal digital assistants (PDAs), and portable game machines; and home appliances such as video cameras, televisions, and electronic ovens. Equipment; rear monitors, car navigation system monitors, car audio equipment and other in-vehicle equipment; commercial shop information monitors and other display equipment; surveillance monitors and other security equipment; care monitors, medical monitors, etc. / Medical equipment, etc. [Examples] Hereinafter, examples and comparative examples will be further described, but the present invention is not limited to the examples. [Example 1] (Preparation of Adhesive) 97 parts by weight of butyl acrylate and benzyl acetonitrile 5 were added together with 140 parts by weight of ethyl acetate in a 4-neck flask equipped with a condenser tube, a stirring blade, and a thermometer. Parts by weight and 2,2,-azobisisobutyronitrile were used in an amount of 1 part by weight, and after sufficiently replacing with nitrogen, the mixture was stirred under a nitrogen stream while being at 55. (: The reaction was carried out for 8 hours to obtain a solution of an acrylic polymer having a weight average molecular weight of 2,000,000. A crosslinking agent (Nippon) was added in terms of solid content with respect to 100 parts by weight of the solid content of the solution of the acrylic polymer. 0.45 parts by weight of a product name "Coronate L" manufactured by Polyurethane Co., Ltd., and 0.1 parts by weight of a Shih-hsuan coupling agent (trade name "KBM 403" manufactured by Shin-Etsu Silicones) was added to prepare an adhesive solution. 156468.doc -22- 201217841 (Formation of Adhesive Layer) Using a reverse roll coating method, the thickness of the adhesive layer after drying is 20 μηι, in the form of a polyester film (thickness) which has been subjected to mold release treatment. Applying the obtained adhesive solution on a separator of 38 μm), heat-treating at 35 ° C for 3 minutes, and evaporating the solvent to obtain an adhesive layer. - (Preparation of polarizing plate) between rolls of different peripheral speeds The polymer film having a polymerization degree of 2400 and a saponification degree of 99 9 Q mol% as a main component is stretched and conveyed while being dyed to obtain a polyvinyl alcohol-based polarizing element. First, dipping in a water bath The polyvinyl alcohol film was swollen in 1 minute, and extended to 1.2 times in the transport direction, and then immersed in 3 (TC of potassium iodide concentration 〇〇 3 wt%, iodine concentration 〇 3 wt / 〇 water/glutle solution). By dyeing one side, it is extended to three times in the transport direction based on the completely unstretched film (original length), and then on the side of 6 (TC of boric acid concentration: 4% by weight, potassium iodide concentration: 5% by weight) After 30 seconds of collapse, the film was stretched to 6 以 times on the basis of the original length in the transport direction. Then, the obtained stretched film was dried at 7 ° C for 2 minutes to obtain a polarizing element. Further, the polarizing element was used. The thickness is 3 〇μιη. On both sides of the polarizing element obtained in this manner, the modified methyl propyl (IV) is bonded to the phthalate by the polyethylene glycol/adhesive agent (Toyo Steel Co., Ltd., F. Film RZ-30NA-S", photoelastic coefficient: 15χ1〇-12 m /Ν), made of a polarizing plate with a transparent protective film laminated on the polarizing element. (Production of adhesive polarizer) Transparency of the above polarizing plate (4) The surface of the film is coated with a primer to form a bottom Layer (thickness: 100 nm). The primer is made of polyethyleneimine (Japanese 156468.doc • 23-201217841, made of EPOMIN P-1000). Then, it is laminated on the undercoat layer. The release sheet of the adhesive layer was formed into an adhesive polarizing plate. [Examples 2 to 3, Comparative Examples 1 to 4] In the preparation of the adhesive of Example 1, the addition ratio of butyl acrylate to acrylic vinegar was changed. An adhesive solution was prepared in the same manner as in Example 1. [Examples 4 to 6 and Comparative Examples 5 to 8] In the preparation of the adhesive of Example 1, the addition of butyl acrylate and benzyl acrylate was changed. An adhesive solution was prepared in the same manner as in Example 1 except for the above. Further, in the production of the polarizing plate of Example 1, a cyclic olefin resin film (manufactured by JAPAN Co., Ltd., trade name "Zeonor Film ZB14-55124", photoelastic coefficient: 4.0x1 0·12 m2/N) was used instead of A. The methacrylate-based resin film is used as a transparent protective film. An adhesive polarizing plate was produced in the same manner as in Example 1 except the above. [Examples 7 to 9 and Comparative Examples 9 to 12] An adhesive solution was prepared in the same manner as in Example 1 except that the addition ratio of butyl acrylate to benzyl acrylate was changed in the preparation of the adhesive of Example 1. . Further, in the production of the polarizing plate of Example 1, a trimethyl fluorene-based cellulose film (manufactured by Fujifilm, trade name "FUJITAC TD80UL", photoelastic coefficient: 16x10_12 m2/N) was used instead of the modified methacrylic acid. A methyl ester resin film is used as a transparent protective film. Other than the above, an adhesive polarizing plate was produced in the same manner as in the first embodiment. [Example 1 〇~12, Comparative Examples 13 to 16] In the preparation of the adhesive of Example 1, the addition ratio of butyl butyl acrylate to acryl 156468.doc -24·201217841 benzyl ester was changed, and An adhesive solution was prepared in the same manner as in Example 。. Further, in the production of the polarizing plate of Example 1, a triethylenesulfonated cellulose film (manufactured by Konica Minolta, trade name: KC4KR_i, "photoelastic coefficient: 21 · 8 χ 10_12 m2 / N) was used instead of the modification. A methyl methacrylate-based resin film is used as a transparent protective film. Otherwise, an adhesive polarizing plate was produced in the same manner as in Example 1. [Examples 13 to 15 and Comparative Examples 1 to 20] Adhesives were prepared in the same manner as in Example 1 except that the addition ratio of butyl acrylate to acrylic vinegar was changed in the preparation of the adhesive of Example 1. Solution. In the production of the polarizing plate of the first embodiment, a phenyl-butylene-imide-based resin film (manufactured by Tosoh Corporation, under the trade name "ΤΙ-160α", photoelastic coefficient: -14xl was used. 〇-i2 m2/N) replaces the modified methyl methacrylate resin film as a transparent protective film. An adhesive polarizing plate was produced in the same manner as in Example 1 except the above. [Examples 16 to 18, Comparative Examples 21 to 24] Adhesives were prepared in the same manner as in Example 丨 except that the addition ratio of butyl acrylate to benzyl acrylate was changed in the preparation of the adhesive of Example 1. Solution. Further, in the production of the polarizing plate of Example 1, a modified polycarbonate film (manufactured by Teijin Chemical Co., Ltd., trade name "PURE-ACE WR", photoelastic coefficient: -30x1 (Γ12 m2/N) was used instead of the modified nail. A non-volatile protective film was produced as a transparent protective film. In the same manner as in Example 1, an adhesive polarizing plate was produced. [Production of Liquid Crystal Panel] Self-contained VA (Vertical Alignment) and IPS (In-Plane Switching) modes Liquid crystal TV of liquid crystal unit (sold by Sony, trade name "BRAVIA") Remove the liquid crystal panel 'Remove the polarizing plate disposed above the liquid crystal cell, clear 156468.doc -25- 201217841 Wash the glass surface of the liquid crystal cell (surface and Then, the adhesion type bias [evaluation] (measurement of luminance at the center of the screen and the corner of the face) of the above-described respective examples and comparative examples is bonded to both surfaces of the liquid crystal cell, and the respective embodiments are bonded. And the liquid crystal panel of the adhesive polarizing plate of the comparative example was placed in an air circulating type thermostat of 95 ° C for 24 hours, and the liquid crystal panel was taken out and placed on a backlight of 1 〇〇〇〇 cd/m 2 to display black. , The luminance in the front direction of the center portion of the kneading surface and the corner portion (four corners) of the kneading surface was measured by a brightness measuring device (manufactured by TOPCON, product name "BM_5a"). (Measurement of in-plane luminance deviation) Further, 95 ° C was applied. The liquid crystal panel of the air circulation type thermostatic chamber is placed on the backlight of 10,000 cd/m2 with a brightness of 10000 cd/m2 to display the color, and the in-plane brightness measuring device (I-SYSTEM, trade name r Eye Scale-4) W") The in-plane luminance of the screen was measured. The results of the measurement of the shell degree are shown in Table 1 together with the adhesive composition of the adhesive polarizing plate of each of the examples and the comparative examples and the photoelastic coefficient of the transparent protective film. Further, in Table 1, X represents the photoelastic coefficient of the transparent protective film, and the content of the (fluorenyl) acrylate monomer unit having an aromatic ring structure in the acrylic polymer which does not constitute the adhesive (% by weight) Moreover, the brightness of the corner is the average value of the four corners of the screen, and the "brightness difference" indicates the difference between the central portion and the corner of the skull. The Δσ in Table 1 indicates the deviation of the in-plane luminance before the high-temperature test is input. In-plane brightness after high temperature test Deviation difference Δσ=Α^. 156468.doc -26- 201217841 [Table i] X (xlO'12m2/N) Y (% by weight) Luminance (cd/m2) Center portion brightness difference Δσ Comparative example 1 1.5 0.0 0.08 1.25 1.17 0.088 Example 1 1.5 5.0 0.07 0.45 0.38 0.032 Example 2 1.5 13.4 0.05 0.10 0.05 0.004 Example 3 1.5 20.0 0.06 0.49 0.43 0.036 Comparative scar 1.5 26.0 0.06 1.70 1.64 0.095 Comparative 彳歹1j3 1.5 38.0 0.07 3.66 3.59 0.366 Comparative Example 4 1.5 49.3 0.08 9.11 9.03 1.149 Comparative Example 5 4.0 0.0 0.05 1.12 1.07 0.092 Implementation of your j4 4.0 5.0 0.07 0.53 0.46 0.039 Example 5 4.0 13.4 0.08 0.17 0.09 0.007 Example 6 4.0 20.0 0.04 0.48 0.44 0.034 彳歹丨j6 4.0 26.0 0.05 1.25 1.20 0.104 Comparative Example 7 4.0 38.0 0.08 4.32 4.24 0.442 Comparison 彳歹1j 8 4.0 49.3 0.09 9.03 8.94 1.121 0.077 Comparative Example 9 16.0 0.0 0.09 0.98 0.89 Example 7 16.0 5.0 0.04 0.40 0.36 0.031 Greedy Example 8 16.0 13.4 0.06 0.21 0.15 0.012 Example 9 16.0 20.0 0.08 0.55 0.47 0.037 Comparative Example 10 16.0 26.0 0.07 1.49 1.42 0.125 Comparative Example 11 16.0 38.0 0.08 4.73 4.65 0.495 Comparison j 12 16.0 49.3 0.06 9.61 9.55 1.297 Comparative Example 13 21.8 0.0 0.05 0.86 0.81 0.069 Example 10 21.8 5.0 0.06 0.38 0.32 0.028 Example 11 21.8 13.4 0.08 0.19 0.11 0.009 Example 12 21.8 20.0 0.09 0.57 0.48 0.041 'Comparative j 14 21.8 26.0 0.07 1.60 1.53 0.138 than board bin ijl5 21.8 38.0 0.08 4.94 4.86 0.543 Compare you Ϊ 16 21.8 49.3 0.07 9.92 9.85 1.344 Comparative Example 17 -14.0 0.0 0.09 1.47 1.38 0.121 Example 13 -14.0 5.0 0.07 0.56 0.49 0.043 Example 14 -14.0 13.4 0.06 0.24 0.18 0.016 Example 15 -14.0 20.0 0.07 0.38 0.31 0.025 4 Compared to your j 18 -14.0 26.0 0.08 0.61 0.53 0.051 Comparison i 19 -14.0 38.0 0.09 3.75 3.66 0.340 than 交 命 1j 20 -14.0 49.3 0.08 8.15 8.07 1.034 Comparative Example 21 -30.0 0.0 0.08 1.77 1.69 0.152 Comparative Example 22 -30.0 5.0 0.07 0.59 0.52 0.052 Example 16 -30.0 13.4 0.07 0.26 0.19 0.016 Example 17 -30.0 20.0 0.06 0.29 0.23 0.019 Example 18 -30.0 26.0 0.09 0.59 0.50 0.044 4 is less than j23 -30.0 38.0 0.05 3.22 3.17 0.311 Compare you j 24 -30.0 49.3 0.06 7.40 7.34 0.891

As shown in the surface 1 of the display device, it is understood that in the liquid crystal display using the adhesive polarizing plate of the embodiment, the difference in luminance between the center and the corner of the face is small, and variations in the deviation of the brightness before and after the heating test are also suppressed. As such, the liquid crystal display device using the 156468.doc • 27-201217841 adhesive-type polarizing plate of the present invention is less likely to cause light leakage and brightness change caused by the use of the ring. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing an adhesive polarizing plate according to an embodiment of the present invention; and Fig. 2 is a schematic cross-sectional view showing an image display device according to an embodiment of the present invention. [Main component symbol description] 1 Polarizing element 2, 3 Transparent protective film 5 Adhesive layer 10 Adhesive polarizing plate 20 Image display unit 100 Image display device 156468.doc

Claims (1)

201217841 VII. Patent application scope · The adhesive type polarizing plate is a 'protective film' in at least one single-layer layer of the polarizing element, and is adhered on the side of the transparent protective film which is not laminated with the polarizing element. The agent layer, and the agent layer is an adhesive agent containing an acrylic polymer containing (meth)acrylic acid alkyl vinegar and (meth) propylene vinegar having an aromatic ring structure as a monomer unit. When the photoelastic coefficient of the transparent protective film is x (m2/N), and the content of the (meth) acrylate monomer unit having an aromatic ring structure in the acrylic conjugate is set to Y% The absolute value of X is 50×10·12 or less, and X and Y satisfy −1χ1〇ιιχ+3$ _1χ1〇11χ+23. 2. The adhesive polarizing plate of claim 1, wherein the transparent protective film comprises At least one of a group consisting of an acrylic resin, a cyclic olefin resin, a phenyl maleimide resin, a cellulose resin, and a modified polycarbonate resin. Like a display device' which uses an adhesive type as claimed in claim 1 or 2. Light board 0 156468.doc