CN101923183B - Optical laminate and manufacture method thereof - Google Patents

Abstract

The present invention provides a kind of optical laminate and manufacture method thereof, and described optical laminate possesses: liquid crystal cell substrate; Adhesive layer, it contacts and stacking with the surface of this liquid crystal cell substrate, the actinic energy ray hardening resin composition containing the epoxy compound in molecule with at least 1 epoxy radicals the solidfied material formed; Polarization plates, it contacts and stacking with the surface of this adhesive layer, and having gas absorption quantity in polyvinyl alcohol resin has the polarizing coating of dichromatic pigment, the thickness of described polarization plates to be less than 100 ��m.

Description

Optical laminate and manufacture method thereof

Technical field

The present invention relates to a kind of optical laminate for liquid crystal indicator, more specifically, relate to a kind of optical laminate passing through adhesive layer laminated polarizing plate on the liquid crystal cell substrate comprising the glass constituting liquid crystal indicator or plastic sheet etc. It addition, the invention still further relates to the manufacture method of this optical laminate.

Background technology

Polarization plates can act effectively as the optics constituting liquid crystal indicator. As polarization plates, at present, the polarization plates of the structure of the protective layer that the stackings such as the one or two sides water system adhesive being generally used for polarizing coating comprise transparent resin film. As such transparent resin film, from the viewpoint of optical transparence or excellent moisture permeability, it is used mostly tri acetyl cellulose membrane (TAC film). Even if only when the one side of polarizing coating arranges protective layer, also mostly being had the resin molding of the optical functions such as phase difference function on the another side of polarizing coating by adhesive or binding agent stacking, it has both the defencive function of polarizing coating. For the polarization plates so constituted, by other optical functional layer as required, paste on liquid crystal cell with binding agent, make liquid crystal panel and be assembled in liquid crystal indicator.

Liquid crystal indicator is as slim display pictures such as LCD TV, LCD monitor, personal computers, and its purposes expands rapidly. In such purposes expands, it is desirable to constitute its parts also slimming more. As it has been described above, polarization plates is pasted on liquid crystal cell typically by adhesive, this is because have in some inappropriate situation after stickup, easily can peel from liquid crystal cells, paste other polarization plates more convenient. But, for adhesive, it is generally the case that need the thickness of about at least 20 ��m in order to keep appropriate bonding force, become a bottleneck in seeking the slimming of liquid crystal panel or liquid crystal indicator.

Also have the liquid crystal cell side protective layer attempted by omitting polarizing coating, directly form adhesive phase thereon, this adhesive phase be pasted onto on liquid crystal cells and seek slimming. But, for so directly pasting the state of polarizing coating and liquid crystal cells with adhesive phase, when carrying out the heat resistant test being exposed to high temperature, sometimes only adhesive phase can not fully absorb the contraction of polarizing coating, produces to float, peel off, the bad phenomenon such as foaming between polarizing coating and adhesive phase. It addition, when being repeatedly performed thermal shock test (thermal shock test) of the condition of high temperature and low temperature state, however it remains only adhesive phase can not fully absorb the flexible of polarizing coating sometimes, thus causing that polarizing coating breaks.

Other trial as the slimming seeking polarization plates; such as; technology disclosed in Japanese Unexamined Patent Publication 2004-245924 publication is; in polyvinyl alcohol resin, gas absorption quantity has at least one side of the polarizing coating of dichromatic pigment; after being coated with uncured composition epoxy resin; make said composition solidify, be consequently formed protecting film.But, by adhesive by be protecting film with the solidfied material of composition epoxy resin polarization plates paste state on liquid crystal cell, durability is insufficient, for instance when carrying out thermal shock test, sometimes still results in polarizing coating and breaks. Additionally; technology disclosed in Japanese Unexamined Patent Publication 2004-245925 publication is; in polyvinyl alcohol resin, gas absorption quantity has on the polarizing coating of dichromatic pigment, by the adhesive bonding protective film that the compositions that is main constituent by the epoxy resin not comprise aromatic rings is formed, makes polarization plates.

On the other hand, Japanese Unexamined Patent Publication 9-159828 publication is disclosed that, in the one side of polarizing coating, form the adhesive layer comprising photo-curable adhesive, it is made band adhesive layer polarization plates, by this adhesive layer, polarization plates is bonded on liquid crystal cell substrate, wherein, the composition of described photo-curable adhesive is, relative ethylene, the terpolymer of acrylic ester and/or methacrylate ester monomer and maleic acid and/or maleic anhydride, it is respectively cooperating with the photosensitizer of ormal weight and containing unsaturated compounds such as acryloyl-oxy based compounds, the document also states that and arranges the protecting film formed by above-mentioned photo-curable adhesive on the another side of polarizing coating. but, when making polarization plates be bonded on liquid crystal cell substrate by the adhesive disclosed in the document, in heat resistant test or thermal shock test, although not finding big problem in the liquid crystal cells of miniature dimensions, but medium-sized to the liquid crystal cells of big size, there is polarization plates and break such problem from liquid crystal cell substrate sur-face peeling or polarizing coating.

It addition, Japanese Unexamined Patent Publication 2004-4636 publication is disclosed that the technology being supplied polarization plates by adhesive by roller, being affixed directly on liquid crystal cell substrate.

Summary of the invention

It is an object of the invention to, by across adhesive by polarization plates and crystal liquid substrate stacking, it is provided that the optical laminate of a kind of thin light and excellent durability. It addition, other purposes of the present invention are in that to provide effective manufacture method of such optical laminate.

The present invention provides a kind of optical laminate, and it possesses: liquid crystal cell substrate; Adhesive layer, it contacts and stacking with the surface of this liquid crystal cell substrate, and the solidfied material being made up of the actinic energy ray hardening resin composition containing the epoxy compound in molecule with at least 1 epoxy radicals; Polarization plates, it contacts and stacking with the surface of this adhesive layer, and has dichromatic pigment gas absorption quantity polarizing coating in polyvinyl alcohol resin, and the thickness of described polarization plates is less than 100 ��m.

In the optical laminate of the present invention, the actinic energy ray hardening resin composition for forming adhesive layer can also contain oxetanes based compound further. It addition, the thickness of adhesive layer is preferably less than 10 ��m. The polarization plates of the optical laminate preferably comprising the present invention possesses: contact and the described polarizing coating of stacking with the surface of adhesive layer; With, it is layered in and the protective clear layer on the face of the described adhesive layer opposition side in described polarizing coating.

And then, according to the present invention, also provide for the manufacture method of a kind of optical laminate, it possesses following operation: adhesive layer formation process, it is on the surface of the polarization plates that thickness is less than 100 ��m with dichromatic pigment gas absorption quantity polarizing coating in polyvinyl alcohol resin, forms the adhesive layer being made up of the actinic energy ray hardening resin composition containing the epoxy compound in molecule with at least 1 epoxy radicals;Adhering processes, pastes the adhesive layer being formed at polarization plates surface at liquid crystal cell substrate; Curing process, irradiates actinic energy ray, makes adhesive layer solidify.

According to the present invention, compare with existing optical laminate polarization plates being pasted onto on liquid crystal cell substrate by adhesive, owing to thickness can be reduced, therefore the thin light of optical laminate or even liquid crystal panel can be sought, it addition, the adaptation of polarization plates and liquid crystal cell substrate is also good. And then, by by adhesive (Japanese: then) rather than binding agent (Japanese: adhesion) for the joint of liquid crystal cell substrate and polarization plates, it is provided that can also substantially resistant to heat treated when being assembled by device or device use time the optical laminate of environmental condition. The optical laminate of such present invention can be particularly preferred for the large-scale liquid crystal indicators such as TV.

Accompanying drawing explanation

Fig. 1 indicates that the generalized section of the Primary layer structure of the optical laminate of the present invention.

Fig. 2 indicates that the generalized section of a mode of the layer structure of the optical laminate of the present invention.

Fig. 3 indicates that the generalized section of another mode of the layer structure of the optical laminate of the present invention.

Detailed description of the invention

As shown in the generalized section of Fig. 1, the optical laminate of the present invention possesses: liquid crystal cell substrate 1; Adhesive layer 2, it contacts and stacking with the surface of liquid crystal cell substrate 1, and is formed by the solidfied material of actinic energy ray hardening resin composition; Polarization plates 5, it contacts and stacking with the surface of adhesive layer 2, has dichromatic pigment gas absorption quantity polarizing coating in polyvinyl alcohol resin, and the thickness of described polarization plates 5 is less than 100 ��m. So, stratified liquid crystal cell substrate 1/ adhesive layer 2/ polarization plates 5 and form optical laminate 10. Below, optical laminate and manufacture method thereof to the present invention are described in detail.

<liquid crystal cell substrate>

Clamping liquid crystal between liquid crystal cell substrate 1 and another 1 substrate (not shown), constitute liquid crystal cells, this liquid crystal cells constitutes the core component of liquid crystal indicator. Liquid crystal cell substrate 1 can be constituted with glass or transparent plastic sheet. Glass can be the generally known various glass plates such as soda-lime glass, low alkali borosilicate glass, Aluminiu, boron silicate glass without alkali, but liquid crystal cells particularly preferably uses alkali-free glass. Additionally, for transparent plastic sheet, as long as it is transparent and the material of liquid crystal cell substrate can be formed, just can also use various known material, as concrete example, the flexible base board comprising the transparent resins such as Merlon, polymethyl methacrylate, polyethylene terephthalate, epoxy resin can be enumerated.

<adhesive layer>

In the present invention, above-mentioned liquid crystal cell substrate 1 and the polarization plates 5 comprising polarizing coating are pasted by adhesive layer 2 ' (not shown), described adhesive layer 2 ' is made up of the actinic energy ray hardening resin composition containing the epoxy compound having at least 1 epoxy radicals in molecule passing through to solidify to form adhesive layer 2, preferably this paste being irradiated actinic energy ray makes adhesive layer 2 ' solidify, and makes optical laminate 10. By making actinic energy ray hardening resin composition contain epoxy compound, while the good adhesivity given between polarization plates 5 and liquid crystal cell substrate 1, the adhesive layer that the excellent endurance quality such as the transparency, mechanical strength, heat stability is high can be obtained. In the present invention, so-called " having the epoxy compound of at least 1 epoxy radicals in molecule " refers to the epoxy radicals in molecule with more than 1, the compound that can be solidified by irradiation actinic energy ray (such as, ultraviolet, visible ray, electron ray, X ray etc.).Below sometimes by include epoxy compound and oxetanes based compound described later and (methyl) acrylic compounds, the compound that can solidify by irradiating actinic energy ray be referred to as actinic energy ray curable compound.

As above-mentioned epoxy compound, consider from the viewpoint such as weatherability, refractive index, cationically polymerizable, it is preferable that by epoxy compound principal component without aromatic rings in molecule. As epoxy compound without aromatic rings in molecule, it is possible to example: there are the glycidyl ether of the polyhydric alcohol of ester ring type ring, aliphatic epoxy based compound, ester ring type epoxy compound etc.

The glycidyl ether of the polyhydric alcohol with ester ring type ring is illustrated. The polyhydric alcohol with ester ring type ring can be through in the presence of a catalyst, under elevated pressure the aromatic rings of aromatic polyol carried out the compound that selective hydrogenation is obtained. As aromatic polyol, can enumerate such as: the bisphenol type compounds of bisphenol-A, Bisphenol F, bisphenol S etc; The phenolic varnish type resin of phenol resol resins, cresol novolac resin, hydroxy benzaldehyde phenol resol resins etc; The compound etc. of the multifunctional type of tetrahydroxy diphenyl methane, tetrahydroxybenzophenone, polyvinylphenol etc. By making the aromatic rings to these aromatic polyols carry out the obtained ester ring type polyhydric alcohol of hydrogenation and epichlorohydrin reaction, glycidyl ether can be made, in the glycidyl ether of such polyhydric alcohol with ester ring type ring, as preferred compound, the diglycidyl ether of bisphenol-A through over hydrogenation can be enumerated.

As aliphatic epoxy based compound, the polyglycidyl ether of aliphatic polyol or its alkylene oxide adducts can be enumerated. More specifically, can enumerate: the diglycidyl ether of BDO; The diglycidyl ether of 1,6-hexanediol; The triglycidyl ether of glycerol; The triglycidyl ether of trimethylolpropane; The diglycidyl ether of Polyethylene Glycol; The diglycidyl ether of propylene glycol; Polyglycidyl ether etc. by the obtained polyether polyol of the epoxyalkane (oxirane or expoxy propane) that the aliphatic polyol additions such as ethylene glycol, propylene glycol or glycerol is one kind or two or more.

It addition, so-called ester ring type epoxy compound refers to the epoxy compound with at least 1 epoxy radicals being bonded on ester ring type ring. So-called " being bonded in the epoxy radicals on ester ring type ring " refers to that 2 of "-O-" in following formula distinguish Direct Bonding on 2 carbon atoms (being generally adjacent carbon atom) constituting ester ring type ring in conjunction with hands, and in formula, m is the integer of 2��5.

Thus, the compound that represents by above-mentioned formula the or remove (CH in above-mentioned formula₂)_mIn 1 hydrogen atom or the group bonding of form of the multiple hydrogen atom compound in other chemical constitution can form ester ring type epoxy compound. (CH can also be suitably replaced with the straight-chain alkyl such as methyl or ethyl etc.₂)_mIn 1 hydrogen atom or multiple hydrogen atom.

In epoxy compound as above, preferred ester ring type epoxy compound, namely at least 1 epoxy radicals is bonded in the compound on ester ring type ring, especially good adhesivity high from the viewpoint of the elastic modelling quantity of solidfied material, that can give between polarization plates and liquid crystal cell substrate, more preferably uses and has oxabicyclo hexane ring (in above-mentioned formula the compound of m=3) or the epoxy compound of oxa-bicyclo heptane ring (in above-mentioned formula the compound of m=4).Below, the structure of the ester ring type epoxy compound being preferably used in the concrete example present invention, but it is not limited to these compounds.

The epoxycyclohexane carboxylate class of a epoxycyclohexyl-methyl that () represents by following formula (I):

(in formula, R¹And R²Represent the straight-chain alkyl of hydrogen atom or carbon number 1��5 independently of each other. )

The epoxycyclohexane carboxylate class of b alkane diols that () represents by following formula (II):

(in formula, R³And R⁴Representing the straight-chain alkyl of hydrogen atom or carbon number 1��5 independently of each other, n represents the integer of 2��20. )

The epoxycyclohexyl-methyl esters of c dicarboxylic acids that () represents by following formula (III):

(in formula, R⁵And R⁶Representing the straight-chain alkyl of hydrogen atom or carbon number 1��5 independently of each other, p represents the integer of 2��20. )

The epoxycyclohexyl-methyl ethers of d Polyethylene Glycol that () represents by following formula (IV):

(in formula, R⁷And R⁸Representing the straight-chain alkyl of hydrogen atom or carbon number 1��5 independently of each other, q represents the integer of 2��10. )

The epoxycyclohexyl-methyl ethers of e alkane diols that () represents with following formula V:

(in formula, R⁹And R¹⁰Representing the straight-chain alkyl of hydrogen atom or carbon number 1��5 independently of each other, r represents the integer of 2��20. )

F diepoxy three spiro-compound that () represents by following formula (VI):

(in formula, R¹¹And R¹²Represent the straight-chain alkyl of hydrogen atom or carbon number 1��5 independently of each other. )

G diepoxy single-spiro compound that () represents by following formula (VII):

(in formula, R¹³And R¹⁴Represent the straight-chain alkyl of hydrogen atom or carbon number 1��5 independently of each other. )

H VCH diepoxide class that () represents by following formula (VIII):

(in formula, R¹⁵Represent the straight-chain alkyl of hydrogen atom or carbon number 1��5. )

I epoxycyclopentyl ethers that () represents by following formula (IX):

(in formula, R¹⁶And R¹⁷Represent the straight-chain alkyl of hydrogen atom or carbon number 1��5 independently of each other. )

J diepoxy tristane class that () represents by following formula (X):

(in formula, R¹⁸Represent the straight-chain alkyl of hydrogen atom or carbon number 1��5. )

In the ester ring type epoxy compound of above-mentioned example, consider from becoming more readily available the reason such as commercially available product or its homolog, it is particularly preferred that use following ester ring type epoxy compound.

(A) 7-oxabicyclo [4.1.0] heptane-3-carboxylic acid and (7-oxa--dicyclo [4.1.0]-3-in heptan base) methanol carboxylate (in above-mentioned formula (I), R¹=R²The compound of=H),

(B) 4-methyl-7-oxabicyclo [4.1.0] heptane-3-carboxylic acid and (4-methyl-7-oxa--dicyclo [4.1.0]-3-in heptan base) methanol carboxylate (in above-mentioned formula (I), R¹=4-CH₃��R²=4-CH₃Compound),

(C) 7-oxabicyclo [4.1.0] heptane-3-carboxylic acid and 1��2-ethandiol carboxylate (in above-mentioned formula (II), R³=R⁴=H, n=2 compound),

(D) (7-oxabicyclo [4.1.0]-3-in heptan base) methanol and adipic acid carboxylate (in above-mentioned formula (III), R⁵=R⁶=H, p=4 compound),

(E) (4-methyl-7-oxabicyclo [4.1.0]-3-in heptan base) methanol and adipic acid carboxylate (in above-mentioned formula (III), R⁵=4-CH₃��R⁶=4-CH₃, p=4 compound),

(F) (7-oxabicyclo [4.1.0]-3-in heptan base) methanol and 1��2-ethandiol etherate (in above-mentioned formula (V), R⁹=R¹⁰=H, r=2 compound).

In the present invention, epoxy compound can be used alone only a kind, or and can also use two or more.

It addition, for actinic energy ray hardening resin composition, except above-mentioned epoxy compound, oxetanes based compound can also be contained, by adding oxetanes based compound, it is possible to reduce the viscosity of actinic energy ray hardening resin composition, accelerate curing rate.

Oxetanes based compound is the compound in molecule with at least 1 oxetanes ring (4 yuan of cyclic ethers), can enumerate such as: 3-ethyl-3-hydroxymethyl oxetane, Isosorbide-5-Nitrae-bis-((3-ethyl-3-oxetanyl) methoxy) benzene, 3-ethyl-3-(phenoxymethyl) oxetanes, two ((3-ethyl-3-oxetanyl) methyl) ether, 3-ethyl-3-(2-Ethylhexoxymethyl) oxetanes, phenol novolacs oxetanes etc. These oxetanes based compounds can be readily derived commercially available product, such as, all in trade name, it is possible to enumerate " ARONOXETANEOXT-101 ", " ARONOXETANEOXT-121 ", " ARONOXETANEOXT-211 ", " ARONOXETANEOXT-221 ", " ARONOXETANEOXT-212 " (being Toagosei Co., Ltd's system) etc. The use level of oxetanes based compound is not particularly limited, and is generally below 50 weight % with actinic energy ray curable compound generally benchmark, is preferably 10��40 weight %.

When actinic energy ray hardening resin composition for forming adhesive layer comprises the cationically polymerizable compound such as epoxy compound or oxetanes based compound, in its hardening resin composition, generally coordinate photo-induced cationic polymerization initiator. When using photo-induced cationic polymerization initiator, owing to adhesive layer can be formed at normal temperatures, therefore, it is not necessary to too much consider the thermostability of polarizing coating or because expanding the deformation caused, it is possible to adaptation pastes polarization plates and liquid crystal cell substrate well. Further, since photo-induced cationic polymerization initiator plays catalytic action by light, therefore, even if being mixed in hardening resin composition, the storage stability of hardening resin composition or operability are also excellent.

Photo-induced cationic polymerization initiator is the cationic polymerization initiators irradiating the polyreaction producing cation kind or lewis acid, initiation epoxy compound and/or oxetanes based compound utilizing the actinic energy rays such as visible ray, ultraviolet, X ray, electron ray. In the present invention, it is possible to use any kind of photo-induced cationic polymerization initiator, concrete example can be enumerated such as: aromatic diazonium salt; The salt such as aromatic iodonium salts, aromatic series sulfonium salt; Iron-arene complex etc.

As aromatic diazonium salt, can enumerate such as: benzene diazonium hexafluoro antimonate, benzene diazonium hexafluorophosphate, benzene diazonium hexafluoro borate etc.

As aromatic iodonium salts, can enumerate such as: diphenyl iodine four (pentafluorophenyl group) borate, diphenyl iodine hexafluorophosphate, diphenyl iodine hexafluoro antimonate, two (4-nonyl phenyl) iodine hexafluorophosphate etc.

As aromatic series sulfonium salt, can enumerate such as: triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoro antimonate, triphenylsulfonium four (pentafluorophenyl group) borate, 4, the double, two hexafluorophosphate of 4 '-bis-(diphenyl sulfonium base) diphenyl sulfides, 4, the double, two hexafluoro antimonate of 4 '-bis-(two (beta-hydroxy ethyoxyl) phenyl sulfonium base) diphenyl sulfides, 4, the double, two hexafluorophosphate of 4 '-bis-(two (beta-hydroxy ethyoxyl) phenyl sulfonium base) diphenyl sulfides, 7-(two (p-methylphenyl) sulfonium base)-ITX hexafluoro antimonate, 7-(two (p-methylphenyl) sulfonium base)-ITX four (pentafluorophenyl group) borate, 4-phenylcarbonyl group-4 '-diphenyl sulfonium base-diphenyl sulfide hexafluorophosphate, 4-(to tert-butyl-phenyl carbonyl)-4 '-diphenyl sulfonium base-diphenyl sulfide hexafluoro antimonate, 4-(to tert-butyl-phenyl carbonyl)-4 '-two (p-methylphenyl) sulfonium base-diphenyl sulfide four (pentafluorophenyl group) borate etc.

Additionally; as iron-arene complex, can enumerate such as: dimethylbenzene-cyclopentadienyl group ferrum (II) hexafluoro antimonate, cumene-cyclopentadienyl group ferrum (II) hexafluorophosphate, dimethylbenzene-cyclopentadienyl group ferrum (II)-three (trifluoromethyl sulfonyl) salt (Japanese: �� �� �� Application-�� Network �� �� Application �� �� �� �� Le (II) �� �� �� (�� �� Off Le �� �� �� �� Le �� Le �� �� Le) �� �� Na �� De) etc.

These photo-induced cationic polymerization initiators can be readily derived commercially available product, for instance, respectively in trade name, can enumerate: " KAYARADPCI-220 ", " KAYARADPCI-620 " (above for Nippon Kayaku K. K's system); " UVI-6990 " (U.S. combinating carbide company system); " AdekaOptomerSP-150 ", " AdekaOptomerSP-170 " (being ADEKA Corp.'s system above); " CI-5102 ", " CIT-1370 ", " CIT-1682 ", " CIP-1866S ", " CIP-2048S ", " CIP-2064S " (being Tso Tat Co., Ltd., Japan's system above); " DPI-101 ", " DPI-102 ", " DPI-103 ", " DPI-105 ", " MPI-103 ", " MPI-105 ", " BBI-101 ", " BBI-102 ", " BBI-103 ", " BBI-105 ", " TPS-101 ", " TPS-102 ", " TPS-103 ", " TPS-105 ", " MDS-103 ", " MDS-105 ", " DTS-102 ", " DTS-103 " (being Japanese green chemical company system above); " PI-2074 " (Rhodia's system); " UVACURE1590 " (Daicel-�� �� �� �ĥ� company system) etc.

These photo-induced cationic polymerization initiators can individually use, or can also two or more mixing use. In these photo-induced cationic polymerization initiators, particularly aromatic series sulfonium salt, because also there is UV absorbing properties in 300nm wavelength above region, so it is good and liquid crystal cell substrate and polarization plates have the solidfied material of good adaptation to obtain curable excellence, mechanical strength, it is therefore preferable that use.

Relative to total amount 100 weight portion of the cationically polymerizable compounds such as epoxy compound, oxetanes based compound, the use level of photo-induced cationic polymerization initiator is generally 0.5��20 weight portion, is preferably 1��6 weight portion. When the use level of photo-induced cationic polymerization initiator relative to total amount 100 weight portion of cationically polymerizable compound lower than 0.5 weight portion time, it is possible to can make that solidification is insufficient, the adhesivity of mechanical strength or polarization plates and liquid crystal cell substrate declines. On the other hand, when the use level of photo-induced cationic polymerization initiator relative to total amount 100 weight portion of cationically polymerizable compound more than 20 weight portion time, the hygroscopicity of solidfied material is caused to uprise because the ionic substance in solidfied material increases, it is possible to the endurance quality of obtained optical laminate can be made to decline.

Additionally, for forming the actinic energy ray hardening resin composition of adhesive layer, can while containing above-mentioned epoxy compound or while containing epoxy compound and oxetanes based compound, containing free-radical polymerised (methyl) acrylic compounds. By and with (methyl) acrylic compounds, it is possible to expect the effect of hardness or the mechanical strength improving adhesive layer, and then, it is possible to more easily carry out the adjustment of viscosity or the curing rate etc. of actinic energy ray hardening resin composition.

As (methyl) acrylic compounds, it is possible to enumerate: there is in molecule (methyl) acrylate monomer of at least 1 (methyl) acryloxy, make two or more containing having (methyl) acrylate oligomer etc. of at least 2 (methyl) acryloxies in the functional compounds obtained molecule of reaction containing (methyl) acryloyl-oxy based compound.These compounds can individually use, it is also possible to two or more is also used. When two or more also use, it can be two or more (methyl) acrylate monomer, it can also be two or more (methyl) acrylate oligomer, it is of course also possible to and with (methyl) acrylate oligomer of (methyl) acrylate monomer of more than a kind and more than a kind. It should be noted that so-called " (methyl) acrylate " refers to acrylate or methacrylate.

As above-mentioned (methyl) acrylate monomer, can enumerate: there is in two degrees of functionality (methyl) acrylate monomer and molecule in single functionality (methyl) acrylate monomer of 1 (methyl) acryloxy, molecule with 2 (methyl) acryloxies to have polyfunctionality (methyl) acrylate monomer of (methyl) acryloxy of more than 3 in molecule.

Concrete example as single functionality (methyl) acrylate monomer, it is possible to enumerate: (methyl) acrylic acid tetrahydro furfuryl ester, (methyl) acrylic acid 2-hydroxy methacrylate, (methyl) acrylic acid 2-or 3-hydroxy propyl ester, (methyl) acrylic acid 2-hydroxybutyl, (methyl) acrylic acid 2-hydroxyl-3-phenoxy-propyl, (methyl) Isobutyl 2-propenoate, (methyl) tert-butyl acrylate, (methyl) 2-EHA, (methyl) cyclohexyl acrylate, (methyl) acrylic acid double cyclopentenyl ester, (methyl) benzyl acrylate, (methyl) isobornyl acrylate, (methyl) acrylate, (methyl) acrylic acid double cyclopentenyl oxygen ethyl ester, (methyl) acrylate, (methyl) acrylic acid ethyl carbitol ester, trimethylolpropane list (methyl) acrylate, tetramethylolmethane list (methyl) acrylate, phenoxy group Polyethylene Glycol (methyl) acrylate etc.

It addition, as single functionality (methyl) acrylate monomer, it is possible to use carboxylic (methyl) acrylate monomer. As carboxylic single functionality (methyl) acrylate monomer, can enumerate: 2-(methyl) acryloyl-oxyethyl phthalic acid, 2-(methyl) acryloyl-oxyethyl hexahydrobenzene dioctyl phthalate, (methyl) carboxyethyl acrylate, 2-(methyl) acryloyl-oxyethyl succinic acid, N-(methyl) acryloxy-N ', N '-dicarboxyl methyl-p-phenylenediamine, 4-(methyl) acryloyl-oxyethyl trimellitic acid etc.

As two degrees of functionality (methyl) acrylate monomer, representational material has aklylene glycol two (methyl) esters of acrylic acid, polyether polyols two (methyl) esters of acrylic acid, halogen substiuted aklylene glycol two (methyl) esters of acrylic acid, two (methyl) esters of acrylic acid of aliphatic polyol, two (methyl) esters of acrylic acid of hydrogenation dicyclopentadiene or tristane dialkanol, two (methyl) esters of acrylic acid of dioxane glycol or dioxane dialkanol, two (methyl) esters of acrylic acid of the alkylene oxide adducts of bisphenol-A or Bisphenol F, epoxy two (methyl) esters of acrylic acid etc. of bisphenol-A or Bisphenol F, but it is not limited to these materials, various material can be used.

As the example more specifically of two degrees of functionality (methyl) acrylate monomer, can enumerate: ethylene glycol bisthioglycolate (methyl) acrylate, 1,3 butylene glycol two (methyl) acrylate, BDO two (methyl) acrylate, 1,6-hexanediol two (methyl) acrylate, 1,9-nonanediol two (methyl) acrylate, neopentyl glycol two (methyl) acrylate, trimethylolpropane two (methyl) acrylate, tetramethylolmethane two (methyl) acrylate, two-trimethylolpropane two (methyl) acrylate, diethylene glycol two (methyl) acrylate, triethylene glycol two (methyl) acrylate, dipropylene glycol two (methyl) acrylate, tripropylene glycol two (methyl) acrylate, Polyethylene Glycol two (methyl) acrylate, polypropylene glycol two (methyl) acrylate, polytetramethylene glycol two (methyl) acrylate, silicone two (methyl) acrylate, two (methyl) acrylate of hydroxyl trimethylace tonitric DOPCP, 2,2-double, two [4-(methyl) acryl-oyloxyethoxy ethoxyl phenenyl] propane, 2,2-double, two [4-(methyl) acryl-oyloxyethoxy ethoxycyclohexyl] propane, hydrogenation bicyclic pentadiene two (methyl) acrylate, Tricyclodecane Dimethanol two (methyl) acrylate, 1,3-dioxane-2,5-bis-base two (methyl) acrylate (another name: dioxane glycol two (methyl) acrylate), two (methyl) acrylate of the acetal compound (chemical name: 2-(2-hydroxyl-1,1-dimethyl ethyl)-5-ethyl-5-hydroxymethyl-1,3-dioxane) of hydroxyl trimethyl-acetaldehyde and trimethylolpropane, three (hydroxyethyl) chlorinated isocyanurates two (methyl) acrylate etc.

As polyfunctionality (methyl) acrylate monomer more than three-functionality-degree, representational material has: glycerol three (methyl) acrylate, trimethylolpropane tris (methyl) acrylate, two-trimethylolpropane tris (methyl) acrylate, two-trimethylolpropane four (methyl) acrylate, tetramethylolmethane three (methyl) acrylate, tetramethylolmethane four (methyl) acrylate, dipentaerythritol four (methyl) acrylate, dipentaerythritol five (methyl) acrylate, poly-(methyl) acrylate of the aliphatic polyol more than three-functionality-degrees such as dipentaerythritol six (methyl) acrylate, in addition, can enumerate: poly-(methyl) acrylate of halogen substiuted polyhydric alcohol more than three-functionality-degree, three (methyl) acrylate of the alkylene oxide adducts of glycerol, three (methyl) acrylate of the alkylene oxide adducts of trimethylolpropane, 1,1,1-tri-((methyl) acryloyloxyethoxy ethyoxyl) propane, three (hydroxyethyl) chlorinated isocyanurates three (methyl) esters of acrylic acid etc.

On the other hand, (methyl) acrylate oligomer has carbamate (methyl) acrylate oligomer, polyester (methyl) acrylate oligomer, epoxy (methyl) acrylate oligomer etc.

Carbamate (methyl) acrylate oligomer is the compound in molecule with amino-formate bond (-NHCOO-) and at least 2 (methyl) acryloxies. Specifically, it is possible to be respectively provided with hydroxyl (methyl) acrylate monomer of at least 1 (methyl) acryloxy and at least 1 hydroxyl and the urethane product of polyisocyanate in molecule or make polyalcohols and polyisocyanate react obtained end there is the urethane product etc. of (methyl) acrylate monomer being respectively provided with at least 1 (methyl) acryloxy and at least 1 hydroxyl in the carbamate compounds of isocyanate base and molecule.

React hydroxyl (methyl) acrylate monomer used as above-mentioned urethane, can enumerate: (methyl) acrylic acid 2-hydroxy methacrylate, (methyl) acrylic acid 2-hydroxy propyl ester, (methyl) acrylic acid 2-hydroxybutyl, (methyl) acrylic acid 2-hydroxyl-3-phenoxy-propyl, glycerol two (methyl) acrylate, trimethylolpropane two (methyl) acrylate, tetramethylolmethane three (methyl) acrylate, dipentaerythritol five (methyl) acrylate etc.

As the polyisocyanate that such urethane supplied with hydroxyl (methyl) acrylate monomer reacts, can enumerate: hexamethylene diisocyanate, lysinediisocyanate, isophorone diisocyanate, dicyclohexyl methyl hydride diisocyanate, toluene di-isocyanate(TDI), xylylene diisocyanate, by diisocyanate obtained for isocyanates type hydrogenation aromatic in these diisocyanate (such as, hydrogenated tolylene diisocyanate, hydrogenated xylylene diisocyanate etc.), triphenylmethane triisocyanate, the diisocyanate such as dibenzyl benzene triisocyanate or triisocyanate and make the obtained polyisocyanate etc. of the many quantizations of above-mentioned diisocyanate.

Additionally, as there is the carbamate compounds of isocyanate base and the polyhydric alcohol that uses to utilize the reaction with polyisocyanate to make end, except the polyhydric alcohol of aromatic series, aliphatic and ester ring type, it is possible to use PEPA, polyether polyol etc. Polyhydric alcohol as aliphatic and ester ring type, can enumerate: 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, neopentyl glycol, trimethylolethane, trimethylolpropane, two-trimethylolpropane, tetramethylolmethane, dipentaerythritol, dihydroxymethyl heptane, dihydromethyl propionic acid, dimethylolpropionic acid, glycerol, hydrogenated bisphenol A etc.

PEPA is utilize the dehydration condensation of above-mentioned polyalcohols and polybasic carboxylic acid or its anhydride and the compound that obtains. As polybasic carboxylic acid or its anhydride, can enumerate: succinic acid (acid anhydride), adipic acid, maleic acid (acid anhydride), itaconic acid (acid anhydride), trimellitic acid (acid anhydride), pyromellitic acid (acid anhydride), phthalic acid (acid anhydride), M-phthalic acid, p-phthalic acid, hexahydrobenzene dioctyl phthalate (acid anhydride) etc.

For polyether polyol, except poly alkylene glycol, it is also possible to be utilize above-mentioned polyalcohols or dihydroxy benzenes class and the epoxyalkane obtained polyoxyalkylene modified polyalcohol etc. of reaction.

So-called polyester (methyl) acrylate oligomer, refers to the compound in molecule with ester bond and at least 2 (methyl) acryloxies. Specifically, it is possible to use the dehydration condensation of (methyl) acrylic acid, polybasic carboxylic acid or its anhydride and polyhydric alcohol obtains. The polybasic carboxylic acid used as dehydration condensation or its anhydride, can enumerate: succinic acid (acid anhydride), adipic acid, maleic acid (acid anhydride), itaconic acid (acid anhydride), trimellitic acid (acid anhydride), pyromellitic acid (acid anhydride), hexahydrobenzene dioctyl phthalate (acid anhydride), phthalic acid (acid anhydride), M-phthalic acid, p-phthalic acid etc. Additionally, as the polyhydric alcohol that dehydration condensation uses, can enumerate: 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, neopentyl glycol, trimethylolethane, trimethylolpropane, two-trimethylolpropane, tetramethylolmethane, dipentaerythritol, dihydroxymethyl heptane, dihydromethyl propionic acid, dimethylolpropionic acid, glycerol, hydrogenated bisphenol A etc.

Epoxy (methyl) acrylate oligomer can utilize polyglycidyl ether and (methyl) acrylic acid additive reaction to obtain, and has at least 2 (methyl) acrylic acid acyloxy in molecule. As the polyglycidyl ether that additive reaction uses, can enumerate: Ethylene glycol diglycidyl ether, propylene glycol diglycidylether, tripropyleneglycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, bisphenol A diglycidyl ether etc.

When be used for being formed the actinic energy ray hardening resin composition of adhesive layer 2 coordinates (methyl) acrylic compounds, with the total amount of actinic energy ray curable compound for benchmark, its amount is preferably below 20 weight %, more preferably below 10 weight %. When the cooperation quantitative change of (methyl) acrylic compounds is many, it is possible to the adaptation of polarization plates and liquid crystal cell substrate can be made to decline.

When actinic energy ray hardening resin composition contains the free-radical polymerised compound such as (methyl) acrylic compounds as above, it is preferable that coordinate optical free radical polymerization initiator. As optical free radical polymerization initiator, as long as utilize the irradiation of actinic energy ray can cause the material of polymerization of the free-radical polymerised compounds such as (methyl) acrylic compounds, it is possible to use existing known material. For the concrete example of optical free radical polymerization initiator, can enumerate: 1-Phenylethanone., 3-methyl acetophenone, benzyl dimethyl ketal, 1-(4-isopropyl phenyl)-2-hydroxy-2-methyl propane-1-ketone, 2-methyl isophthalic acid-[1-Phenylethanone. series initiators such as 4-(methyl mercapto) phenyl-2-morpholino propane-1-ketone, 2-hydroxy-2-methyl-1-phenyl-propane-1-ketone; Benzophenone, 4-chlorobenzophenone, 4, the benzophenone series initiators such as 4 '-diaminobenzophenone; The benzoin ether series initiators such as benzoin propyl ether, benzoin ethyl ether; The thiaxanthone series initiators such as ITX;In addition with ton ketone, Fluorenone, camphorquinone, benzaldehyde, anthraquinone etc.

Relative to free-radical polymerised compound 100 weight portions such as (methyl) acrylic compounds, the use level of optical free radical polymerization initiator is generally 0.5��20 weight portion, is preferably 1��6 weight portion. When the amount of optical free radical polymerization initiator relative to free-radical polymerised compound 100 weight portion lower than 0.5 weight portion time, it is possible to can make that solidification is insufficient, the cementability of mechanical strength or polarization plates and liquid crystal cell substrate declines. Additionally, when the amount of optical free radical polymerization initiator relative to free-radical polymerised compound 100 weight portion more than 20 weight portion time, the amount of the actinic energy ray curable compound (free-radical polymerised compound such as the curable compound of the cationically polymerizable comprising epoxy compound and (methyl) acrylic compounds) in hardening resin composition tails off relatively, it is possible to the endurance quality of obtained optical laminate can be made to decline.

Actinic energy ray hardening resin composition can contain photosensitizer as required further. By coordinating photosensitizer, it is possible to improve the reactivity of cationic polymerization and/or radical polymerization, improve the adhesivity between mechanical strength or polarization plates and the liquid crystal cell substrate of adhesive layer. As photosensitizer, it is possible to enumerate such as: carbonyl compound, organosulfur compound, persulfide, oxidoreduction based compound, azo and diazonium compound, halogenide and photo-reduction pigment etc. As the example more specifically of photosensitizer, can enumerate such as: benzoin methylether, benzoin iso-propylether, ��, the benzoin derivatives such as alpha, alpha-dimethyl oxygen base-��-phenyl acetophenone; The benzophenone derivates such as benzophenone, 2,4-dichloro benzophenones, o-benzoyl base benzoic acid methyl ester, 4,4 '-bis-(dimethylamino) benzophenone, 4,4 '-bis-(diethylamino) benzophenone; The thioxanthone derivates such as CTX, ITX; The anthraquinone derivative such as 2-chloroanthraquinone, 2-methylanthraquinone; The acridone derivativeses such as N-methylacridine ketone, N-butyl acridone; In addition with ��, ��-diethoxy acetophenone, benzil, Fluorenone, ton ketone, uranyl compound, halogenide etc., but it is not limited to these compounds. These photosensitizer can individually use, it is also possible to two or more mixes use. With actinic energy ray curable total amount of compound for 100 weight portions, the content of photosensitizer is preferably the scope of 0.1��20 weight portion.

It addition, actinic energy ray hardening resin composition can also contain for giving the optical laminate antistatic additive with antistatic property. Antistatic additive is not particularly limited, it is possible to use known antistatic additive. Can use such as: acyl group (Japanese: �� �� �� �� Le) amido propyl dimethyl hydroxyethyl ammonium nitrate, acyl group (Japanese: �� �� �� �� Le) the cation system surfactant such as amido propyl trimethyl ammonium sulfate, cetyl morpholine methyl sulfate; The anion system surfactants such as straight chained alkyl potassium phosphate, polyethylene glycol oxide alkyl phosphoric acid potassium salt, alkane sulfonate; N, N-double; two (hydroxyethyl)-N-alkylamine and the nonionic system such as aliphatic ester derivatives, polyol fat acid moieties esters surfactant etc. thereof. The match ratio of these antistatic additive can compare desired characteristic and suitably determine, with actinic energy ray curable total amount of compound for 100 weight portions, these antistatic additive are generally about 0.1��10 weight portion.

Actinic energy ray hardening resin composition can also add normally used known polymeric additive in macromolecule. Can enumerate such as: the UV absorbent etc. such as a secondary antioxidant such as phenol system or amine system, the secondary antioxidant of sulfur system, hindered amine system light stabilizer (HALS), benzophenone series, benzotriazole system, benzoate system.

And then, actinic energy ray hardening resin composition can also comprise solvent as required. It is contemplated that the dissolubility constituting the composition of actinic energy ray hardening resin composition suitably selects solvent. As commonly used solvent, can enumerate: the aliphatic hydrocarbon such as normal hexane, hexamethylene; Toluene, dimethylbenzene etc. are aromatic hydrocarbon based; The alcohols such as methanol, ethanol, propanol, isopropanol, n-butyl alcohol; The ketones such as acetone, methyl ethyl ketone, methyl iso-butyl ketone (MIBK), Ketohexamethylene; The esters such as methyl acetate, ethyl acetate, butyl acetate; The cellosolve classes such as methyl cellosolve, ethyl cellosolve, butyl cellosolve; The halogenated hydrocarbons such as dichloromethane, chloroform etc. It is contemplated that make the viscosity etc. of the good actinic energy ray hardening resin composition of the processabilities such as film property suitably determine the mixing ratio of solvent.

The thickness of adhesive layer 2 is preferably less than 10 ��m, is more preferably less than 5 ��m. When the thickness of adhesive layer is below 10 ��m, the probability of the outward appearance of damage polarization plates is little. On the other hand, when the thickness of adhesive layer is more than 10 ��m, because the solidification of adhesive is not enough, it is possible to the adhesive tension that can make polarization plates and liquid crystal cell substrate is insufficient.

<polarization plates>

The optical laminate of the present invention with reference to Fig. 1 as explained above, possesses the polarization plates 5 by 2 stackings of adhesive layer described above on liquid crystal cell substrate 1. Polarization plates 5 at least has dichromatic pigment gas absorption quantity polarizing coating in polyvinyl alcohol resin. From the viewpoint of reduce the thickness of optical laminate 10 and then reduce the thickness of liquid crystal panel, the thickness of polarization plates 5 is set as less than 100 ��m. Polarizing coating as above itself individually can also be made polarization plates 5, but owing to polarizing coating itself is crisp, it is therefore preferable that be used in its at least one side, particularly be pasted onto liquid crystal cell substrate 1 opposition side, face face on the material of clear protective film layer is set.

Fig. 2 indicates that the generalized section of a mode of the layer structure of the optical laminate of the present invention. In this approach, the one side at polarizing coating 6 arranges protective clear layer 7 and is made polarization plates 5, is affixed directly on liquid crystal cell substrate 1 with the face of the polarizing coating 6 of the opposition side, face being provided with protective clear layer 7 by adhesive layer 2, constitutes optical laminate 11. That is, in optical laminate 11, contacting with the surface of adhesive layer 2 and be laminated with polarizing coating 6, the surface layer with adhesive layer 2 opposition side in polarizing coating 6 is laminated with protective clear layer 7.

Fig. 3 indicates that the generalized section of another mode of the layer structure of the optical laminate of the present invention. In this approach, the one side at polarizing coating 6 arranges protective clear layer 7, arranges suitable resin bed 8 in another face of polarizing coating 6 and is made polarization plates 5, and this resin bed 8 side is pasted onto on liquid crystal cell substrate 1 by adhesive layer 2, constitutes optical laminate 12. Resin bed 8 can be the protective clear layer same or different from the protective clear layer 7 of the opposition side being arranged on polarizing coating 6, in addition can also be optical functional layer. As the example of optical functional layer, can enumerate to compensate the polarizer used for the purpose of the phase contrast that produced by liquid crystal cells etc. As polarizer, for instance have: the birefringence film formed by the stretched film of various plastics; The film of orientation fixed disc shape liquid crystal or nematic crystal; Film base material is formed the film comprising the material that above-mentioned liquid crystal or inorganic layered compounds etc. manifest phase contrast the film etc. that orientation is fixed. In this case, as the film base material supporting the film comprising the material manifesting phase contrast, it may be preferable to use the cellulose mesenterys such as triacetyl cellulose.

So; for polarization plates 5; as long as comprise polarizing coating 6, thickness is less than 100 ��m; can also have any layer further; from the viewpoint of protection polarizing coating 6 while thinning optical laminate or even liquid crystal panel, the layer beyond polarizing coating 6 is preferably less than 2 layers, is particularly preferably 1 layer or 2 layers.From the viewpoint, the one side at polarizing coating 6 as shown in Figure 2 have protective clear layer 7, be affixed directly on liquid crystal cell substrate 1 with the polyvinyl alcohol resin face of this transparent protective film 7 opposition side (polarizing coating surface) by adhesive layer 2 mode for one of optimal way.

(polarizing coating)

The polarizing coating 6 constituting polarization plates 5 is dichromatic pigment gas absorption quantity film in polyvinyl alcohol resin. More specifically, it is preferred to use in the polyvinyl alcohol resin film of uniaxial tension, gas absorption quantity has the film of dichromatic pigment.

By the resin saponification of polyvinyl acetate system can obtain constituting the polyvinyl alcohol resin of polarizing coating. As polyvinyl acetate system resin, except the polyvinyl acetate as the homopolymer of vinyl acetate, it is possible to example vinyl acetate and can with the copolymer etc. of other monomer of its copolymerization. As with other monomer of vinyl acetate copolymerization, can enumerating such as: unsaturated carboxylic acid class, unsaturated sulfonic acid class, olefines, vinyl ethers etc. The saponification degree of polyvinyl alcohol resin is generally 85��100 moles of about %, is preferably 98��100 moles of %. Polyvinyl alcohol resin can also be modified further, for instance, it is possible to use the polyvinyl formal modified with aldehydes or polyvinyl acetal etc. The degree of polymerization of polyvinyl alcohol resin is generally 1,000��10, and about 000, it is preferred to 1,500��10, about 000.

The material that such polyvinyl alcohol resin is filmed be can serve as the reel film of polarizing coating. The method being filmed by polyvinyl alcohol resin is not particularly limited, it is possible to be filmed by known method. The thickness of polyethenol series reel film is not particularly limited, for instance be 10 ��m��about 150 ��m.

Polarizing coating generally goes through following operation and manufactures: the wound membrane formed by polyvinyl alcohol resin as above carries out the operation of uniaxial tension, polyvinyl alcohol resin film dichromatic pigment dyeing makes it adsorb the operation of this dichromatic pigment, the operation processed by the polyvinyl alcohol resin film boric acid aqueous solution of absorption dichromatic pigment, carry out, after utilizing boric acid aqueous solution to process, the operation washed.

Uniaxial tension can carry out before utilizing dichromatic pigment dyeing, it is also possible to carry out with dyeing, it is also possible to carry out after dyeing simultaneously. When utilize carry out uniaxial tension after dichromatic pigment dyeing, this uniaxial tension can boric acid process before carry out, it is also possible to boric acid process in carry out. Alternatively, it is also possible to carry out uniaxial tension in multiple stages of these operations. When uniaxial tension, it is possible to stretch along single shaft between the roller that peripheral speed is different, it is also possible to stretch along single shaft with hot-rolling. Furthermore it is possible to be the dry type stretching carrying out stretching etc. in an atmosphere, it is also possible to be that the wet type carrying out when making it swelling with solvent stretching stretches. Draw ratio is generally about 4��8 times.

The dyeing utilizing dichromatic pigment of polyvinyl alcohol resin film carries out in the following way, for instance, by polyvinyl alcohol resin film immersion in the aqueous solution containing dichromatic pigment. As dichromatic pigment, iodine, dichromatic organic dyestuff etc. can be used. It should be noted that polyvinyl alcohol resin film is implemented in the impregnation process in water before processing preferably in dyeing in advance.

When using iodine as dichromatic pigment, as colouring method, the method being typically employed in the aqueous solution containing iodine and potassium iodide to impregnate polyvinyl alcohol resin film. It is about 0.01��0.5 weight portion that the content of the iodine in this aqueous solution is commonly angled relative to water 100 weight portion, it addition, it is about 0.5��10 weight portion that the content of potassium iodide is commonly angled relative to water 100 weight portion.The temperature of the aqueous solution for dyeing is generally about 20��40 DEG C, it addition, the dip time (dyeing time) in this aqueous solution is generally about 30��300 seconds.

On the other hand, when using dichromatic organic dyestuff as dichromatic pigment, as colouring method, the method being typically employed in the aqueous dye solutions comprising water miscible dichroic dye to impregnate polyvinyl alcohol resin film. It is 1 �� 10 that the content of the dichroic dye in this aqueous dye solutions is commonly angled relative to water 100 weight portion^-3��1 �� 10^-2About weight portion. Aqueous dye solutions can also contain the inorganic salts such as sodium sulfate as dyeing assistant. The temperature of aqueous dye solutions is generally about 20��80 DEG C, it addition, the dip time (dyeing time) in aqueous dye solutions is generally about 30��300 seconds.

The boric acid after dichromatic pigment dyeing is utilized to process by being carried out in boronic acid containing aqueous solution by the polyvinyl alcohol resin film immersion after dyeing. Boric acid content in boronic acid containing aqueous solution is commonly angled relative to water 100 weight portion and is about 2��15 weight portions, is preferably about 5��12 weight portions. When using iodine as dichromatic pigment, boronic acid containing aqueous solution preferably comprises potassium iodide. The content of the potassium iodide in boronic acid containing aqueous solution is commonly angled relative to water 100 weight portion and is about 2��20 weight portions, is preferably about 5��15 weight portions. Dip time in boronic acid containing aqueous solution is generally about 100��1,200 seconds, is preferably about 150��600 seconds, more preferably about 200��400 seconds. The temperature of boronic acid containing aqueous solution is generally more than 50 DEG C, it is preferred to 50��85 DEG C.

Polyvinyl alcohol resin film after boric acid process generally carries out washing process. Washing processes by being such as carried out in water by borated polyvinyl alcohol resin film immersion. The temperature of the water in washing process is generally about 5��40 DEG C, and dip time is about 2��120 seconds. Implement dried after washing, obtain polarizing coating. Dried can use air drier or far infra-red heater to be carried out. Baking temperature is generally about 40��100 DEG C. The time of dried is generally about 120��600 seconds.

Operate as above, it is possible to being formed in the polyvinyl alcohol resin film of uniaxial tension gas absorption quantity has the polarizing coating of dichromatic pigment. The thickness of polarizing coating can set that to be about 5��40 ��m.

(protective clear layer)

The protective clear layer 7 being arranged at least one side of polarizing coating 6 can be widely used as the suitable thermoplastic resin film composition forming material of protective layer in this field at present with such as cellulose acetate system resin, cyclic olefine resin, polyolefin-based resins, acrylic resin, polyimides system resin, polycarbonate-based resin, polyester based resin etc. It addition, transparent protective film 7 can also comprise the solidfied material of actinic energy ray hardening resin composition. From the viewpoint of production and adhesivity, wherein, it is preferred to use by the solidfied material of the film of acetate fiber prime system resin or cyclic olefine resin formation or actinic energy ray hardening resin composition as protective clear layer 7. When constituting transparent protective film 7 with thermoplastic resin film, its thickness is generally about 10��50 ��m. On the other hand, when constituting transparent protective film 7 with the solidfied material of actinic energy ray hardening resin composition, its thickness can set that to be less than 10 ��m, such as about 1��10 ��m.

Cellulose acetate resin film as protective clear layer 7 is the film formed by cellulosic part or all of acetas compound, can enumerate such as tri acetyl cellulose film, diacetyl cellulose film etc.

Such cellulose acetate resin film can be preferably used suitable commercially available product, for instance " Off �� �� Star Network TD80 ", " Off �� �� Star Network TD80UF " and " Off �� �� Star Network TD80UZ " (above for Fuji Photo Film Co., Ltd.'s system), " KC8UX2M " and " KC8UY " (above for Konica Minolta precision chemical company limited system) (being trade name) etc.

It addition, the cyclic olefine resin that protective clear layer 7 is preferably used is the thermoplastic resin (also referred to as thermoplastic cyclic olefin system resin) with the monomeric unit formed by cyclic olefins (cycloolefin) such as such as norborene or multi-ring norborneol alkene monomers. This cyclic olefine resin can be the hydride of the ring-opening polymerization polymer of above-mentioned cycloolefin, use the hydride of the ring opening copolymer thing of cycloolefin of more than two kinds, it is also possible to be cycloolefin with chain olefin and or there is the addition polymers of aromatic compound etc. of vinyl etc. It addition, the resin being imported with polar group is also effective.

When use cycloolefin and chain olefin and or have the copolymer of aromatic compound of vinyl constitute transparent protective film; as chain olefin; ethylene, propylene etc. can be enumerated; additionally; as the aromatic compound with vinyl, styrene, ��-methyl styrene, alkyl-substituted styrene etc. can be enumerated. In such copolymer, the monomeric unit being made up of cycloolefin can be 50 moles of below % (preferably 15��50 moles of %). Particularly when using cycloolefin and chain olefin and having the terpolymer composition protective clear layer of aromatic compound of vinyl, cycloolefin the monomeric unit formed can set that as few amount compared as discussed above. In such terpolymer, chain olefin the monomeric unit formed is generally 5��80 moles of %, the aromatic compound with vinyl the monomeric unit formed is generally 5��80 moles of %.

Cyclic olefine resin can be preferably used suitable commercially available product, such as " Topas " (TOPAS advanced person Polymer Company system, it is possible to obtain from polymer plastic company of Japan), " ARTON " (JSR Corp.'s system), " �� �� �� �� (ZEONOR) " (Japan �� �� Application Co., Ltd. system), " �� �� �� Star Network �� (ZEONEX) " (Japan �� �� Application Co., Ltd. system), " �� �� Le " (Mitsui Chemicals, Inc's system) (being trade name) etc. During by such cyclic olefine resin-made film forming, can suitably use the known method such as sol-vent cast method, extrusion by melting. Alternatively, it is also possible to use the commercially available product of the resinous film of cyclic olefine of masking in advance such as such as " �� �� �� mono-Na " (Sekisui Chemical Co., Ltd's system), " SCA40 " (Sekisui Chemical Co., Ltd's system), " ZEONOR film " (Japan �� �� Application Co., Ltd. system), " ARTON film " (JSR Corp.'s system) as protective clear layer.

Cyclic olefine resin molding as protective clear layer can use uniaxial tension or biaxial stretch-formed film. In this case draw ratio is generally 1.1��5 times, is preferably 1.1��3 times.

It addition, as the actinic energy ray hardening resin composition that can be used in transparent protective film 7, the resin combination identical with the actinic energy ray hardening resin composition being previously formed adhesive layer 2 can be enumerated. The actinic energy ray hardening resin composition of formation protective clear layer and contained actinic energy ray curable compound etc. thereof and actinic energy ray hardening resin composition and contained actinic energy ray curable compound etc. thereof as adhesive compound can be the same or different.

For the actinic energy ray hardening resin composition for protective clear layer 7; specifically, be previously used for forming the actinic energy ray hardening resin composition of adhesive layer 2 again it is containing the resin combination of epoxy compound; and then, coordinate oxetanes based compound also effective.So, due to containing epoxy compound, and also at random contain oxetanes based compound, so photo-induced cationic polymerization initiator generally also can be coordinated. About these epoxy compounds, oxetanes based compound and photo-induced cationic polymerization initiator, applicable with the same explanation above adhesive layer 2 carried out.

Additionally; actinic energy ray hardening resin composition particularly for protective clear layer 7; except epoxy compound and as the oxetanes based compound of any composition except, containing free-radical polymerised compound, specifically to contain foregoing (methyl) acrylic compounds also effective. By and with (methyl) acrylic compounds, it is possible to make hardness height, mechanical strength, protective clear layer that endurance quality is more excellent. And then, it is possible to carry out the adjustment of viscosity or the curing rate etc. of actinic energy ray resin combination more easily. For in the actinic energy ray hardening resin composition of transparent protective film 7, with actinic energy ray curable total amount of compound for benchmark, (methyl) acrylic compounds can add to about 70 weight %. The use level of (methyl) acrylic compounds is more preferably set as 35��70 weight %, especially preferred is set as 40��60 weight %. When the use level of (methyl) acrylic compounds is more than 70 weight %, it is possible to its adaptation with polarizing coating can be made to decline.

When coordinating such (methyl) acrylic compounds, it is also possible to coordinate foregoing optical free radical polymerization initiator further. For the use level of optical free radical polymerization initiator, applicable with the same explanation above adhesive layer 2 carried out. For protective clear layer 7 actinic energy ray hardening resin composition it can in addition contain containing and same other various compositions of content of above adhesive layer 2 being illustrated.

The transparent protective film 7 of polarization plates can also to implementing the surface treatments such as non-glare treated, hard painting process, antistatic treatment, antireflection process with the face of the opposition side, face being pasted onto on polarizing coating. Alternatively, it is also possible to protective clear layer 7 be pasted on polarizing coating opposition side, face face on formed comprise liquid crystal compounds, its high-molecular weight compounds etc. coating.

When protective clear layer 7 is resin molding, the stickup of polarizing coating 6 and protective clear layer 7 can use adhesive (adhesive compound). Adhesive compound for this use is not particularly limited, and can enumerate: hardening resin composition containing actinic energy ray curable compound, make adhesive component be dissolved or dispersed in the water system adhesive in water. Wherein, because not needing drying process, it is advantageous to use the hardening resin composition containing actinic energy ray curable compound. When hardening resin composition is used as adhesive compound, generally after pasting polarizing coating 6 and protective clear layer 7 by cured resin composition layer, this paste is irradiated actinic energy ray and makes cured resin composition layer solidify.

The hardening resin composition of above-mentioned adhesive compound can be formed and can use the resin combination same with the gluing actinic energy ray hardening resin composition for aforesaid liquid crystal cell substrate 1 and polarization plates 5. Gluing hardening resin composition and contained actinic energy ray curable compound etc. thereof for the gluing actinic energy ray hardening resin composition of liquid crystal cell substrate 1 and polarization plates 5 and contained actinic energy ray curable compound thereof etc. with for protective clear layer 7 and polarizing coating 6 can be the same or different.

It addition, as making adhesive component be dissolved or dispersed in the water system adhesive in water, the adhesive compound being main constituent with polyvinyl alcohol resin or carbamate resins can be enumerated.

When use polyvinyl alcohol resin is as the main constituent of water system adhesive; for this polyvinyl alcohol resin; except partly-hydrolysed polyvinyl alcohol or fully saponified polyvinyl alcohol, it is also possible to be the polyvinyl alcohol resin that is modified such as carboxy-modified polyvinyl alcohol, acetoacetyl modified polyvinyl alcohol, methylol-modified polyvinyl alcohol, amino modified polyvinyl alcohol. When using polyvinyl alcohol resin as adhesive component, the aqueous solution of polyvinyl alcohol resin made mostly by this adhesive. The concentration of the polyvinyl alcohol resin in adhesive is generally about 1��10 weight portion relative to water 100 weight portion, is preferably 1��5 weight portion.

In order to improve adhesivity, comprising polyvinyl alcohol resin as in the adhesive of main constituent, it is preferable that add the curable composition such as Biformyl or water-soluble epoxy resin or cross-linking agent. As water-soluble epoxy resin, it is possible to enumerate such as: make the polyamide polyamines epoxy resin obtained with epichlorohydrin reaction by the polyamide polyamines that the reaction of the dicarboxylic acids such as polyalkylene polyamine and adipic acid such as Diethylenetriamine, three second tetramines is obtained. Commercially available product as such polyamide polyamines epoxy resin, " �� �� �� mono-�� �� �� Application 650 " and " �� �� �� mono-�� �� �� Application 675 " that You Zhuhua CHEMTEX Co., Ltd. sells, Japan PMC Corp " WS-525 " sold etc., it may be preferred to use these commercially available products. Relative to polyvinyl alcohol resin 100 weight portion, the addition of these curable compositions or cross-linking agent is generally 1��100 weight portion, is preferably 1��50 weight portion. When its addition is few, adhesivity improves effect and diminishes, on the other hand, when its addition is many, it is possible to adhesive layer can be made to become fragile.

When use carbamate resins is as the main constituent of water system adhesive, as the example of suitable adhesive compound, it is possible to enumerate Polyester ionomer type carbamate resins and the mixture of the compound with glycidoxypropyl. So-called Polyester ionomer type carbamate resins said here is the carbamate resins with polyester backbone, is wherein imported with a small amount of ionic composition (hydrophilic component). Such ionomer type carbamate resins is not owing to using emulsifying agent and directly emulsifying forms emulsion in water, it is thus preferred to as water system adhesive. Polyester ionomer type carbamate resins is originally as known. Such as: Japanese Unexamined Patent Publication 7-97504 publication records Polyester ionomer type carbamate resins as the example for making phenol system resin dispersion macromolecule dispersing agent in an aqueous medium; Mode disclosed in Japanese Unexamined Patent Publication 2005-070140 publication and Japanese Unexamined Patent Publication 2005-181817 publication is, with the mixture of Polyester ionomer type carbamate resins and the compound with glycidoxypropyl for adhesive, the polarizing coating formed by polyvinyl alcohol resin engages cyclic olefine resin molding.

<manufacture method of optical laminate>

The manufacture method of the optical laminate of the present invention is the method that the method as the optical laminate for manufacturing the above-mentioned present invention is preferably used, possess (1) adhesive layer formation process shown below, (2) adhering processes, it is preferable that there is (3) curing process further.

(1) adhesive layer formation process, on the polarization plates that thickness is less than 100 ��m (polarization plates 5) surface with dichromatic pigment gas absorption quantity polarizing coating in polyvinyl alcohol resin, forming adhesive layer (adhesive layer 2 '), described adhesive layer is formed by the actinic energy ray hardening resin composition containing the epoxy compound having at least 1 epoxy radicals in molecule being used for being formed adhesive layer 2;

(2) adhering processes, on liquid crystal cell substrate (liquid crystal cell substrate 1), pastes the adhesive layer 2 ' being formed at polarization plates 5 surface in above-mentioned adhesive layer formation process;

(3) curing process, the paste comprising liquid crystal cell substrate 1/ adhesive layer 2 '/polarization plates 5 that above-mentioned adhering processes is obtained, irradiate the actinic energy rays such as visible ray, ultraviolet, X ray, electron ray, make adhesive layer 2 ' solidify.

In this manufacture method, polarization plates can be used alone polarizing coating, it is also possible to is the polarization plates of other layer of stacking in advance as mentioned above. When the one side of polarizing coating forms the protective clear layer of solidfied material comprising actinic energy ray hardening resin composition; or when passing through the adhesive stacked film comprising actinic energy ray hardening resin composition; in above-mentioned curing process; adhesive layer 2 ' solidify it is also possible to make protective clear layer solidify or for the solidification of gluing polarizing coating and the adhesive of protective clear layer. Below, each operation is specifically illustrated.

First, in adhesive layer formation process (1), in order to form the adhesive layer 2 ' comprising actinic energy ray hardening resin composition on the surface of polarization plates 5, can adopt with the following method: in polarization plates 5 on the sticking veneer of liquid crystal cell substrate 1, the actinic energy ray hardening resin composition that directly coating is above-mentioned, the method being dried as required; On the base material film comprising the transparent resins such as polyethylene terephthalate additionally prepared, coating actinic energy ray hardening resin composition, after being dried as required, the coating layer of its actinic energy ray hardening resin composition is transferred in the method etc. in polarization plates 5. When adopting the method for the latter, thereafter base material film is removed, supply following adhering processes. As base material film, can enumerate such as: polyethylene terephthalate film, polycarbonate membrane, tri acetyl cellulose membrane, norborene film, polyester film, polystyrene film etc. Lift-off processing can also be implemented in the surface of the coating actinic energy ray hardening resin composition of base material film.

At this; as shown in Figure 2; such as in polarizing coating 6 with the face of opposition side, liquid crystal cell substrate 1 side on the situation of protective clear layer 7 is set; when constituting these protective clear layer 7 with the solidfied material of actinic energy ray hardening resin composition, the surface of polarizing coating 6 may also set up the layer of the actinic energy ray hardening resin composition being equivalent to this protective clear layer 7. When the layer of the actinic energy ray hardening resin composition for protective clear layer 7 is formed at other base material film and is affixed on polarizing coating 6; for this base material film; maintain the original state preferably up to curing process below, peel off after curing process terminates.

Thereafter, in adhering processes (2), the adhesive layer 2 ' being arranged in polarization plates 5 is pasted onto on liquid crystal cell substrate 1. Then, preferably in curing process (3), paste to the order stacking by liquid crystal cell substrate 1/ adhesive layer 2 '/polarization plates 5, irradiates the actinic energy rays such as visible ray, ultraviolet, X ray, electron ray, thus makes adhesive layer 2 ' solidify and obtains optical laminate.Now; when be provided with in polarizing coating 6 with the face of opposition side, liquid crystal cell substrate 1 side on formed protective clear layer 7 actinic energy ray cured resin composition layer, it is preferred to use the actinic energy ray hardening resin composition in this protective clear layer 7 is concurrently cured. Protective clear layer 7 is provided with base material film, it is finally peeled away this base material film of removing.

On the other hand, such as it is used in the situation that the one or two sides of polarizing coating 6 has the polarization plates 5 of the transparent protective film 7 comprising resin molding, when with the gluing protective clear layer 7 of the adhesive comprising actinic energy ray hardening resin composition and polarizing coating 6, actinic energy ray hardening resin composition it is coated with on the composition surface of protective clear layer 7 and/or polarizing coating 6, by the layer stackup polarizing coating 6 of this actinic energy ray hardening resin composition and protective clear layer 7 (resin molding), other and above same operate, obtain the paste being laminated by the order of liquid crystal cell substrate 1/ adhesive layer 2 '/polarization plates 5, this paste is irradiated actinic energy ray with method same above.

It should be noted that, the adhesive layer 2 ' for gluing liquid crystal cell substrate 1 and polarization plates 5 can not also be formed on the surface of polarization plates 5, and make optical laminate in order to lower section legal system: in liquid crystal cell substrate 1 with on the sticking veneer of polarization plates, utilize the coatings such as the spin-coating method actinic energy ray hardening resin composition for forming adhesive layer 2, polarization plates 5 is overlapped in herein, irradiate actinic energy ray, make actinic energy ray hardening resin composition solidify. But, if further contemplating the facility of production, then the one side of polarization plates 5 formed aforesaid comprise actinic energy ray hardening resin composition adhesive layer 2 ', make this adhesive layer 2 ' be pasted onto on liquid crystal cell substrate 1 after, make the method that adhesive layer 2 ' solidifies be advantageous for.

The method that the actinic energy ray hardening resin composition forming adhesive layer or protective clear layer is coated on polarization plates, polarizing coating or on base material film is not particularly limited, it is possible to use the various coating methods such as such as scraper for coating, metal bar coating, die head coating, comma coating, intaglio plate coating. Further, since each coating method has each best range of viscosities, therefore using solvent to carry out viscosity adjustment is also useful technology. As for this solvent, it is possible to enumerate above-mentioned material.

Light source for irradiating actinic energy ray is not particularly limited, it is possible to use has at below wavelength 400nm and sends out such as low pressure mercury lamp, middle medium pressure mercury lamp, high-pressure mercury-vapor lamp, extra-high-pressure mercury vapour lamp, chemical lamp, black light lamp, microwave-excitation finsen lamp, metal halide lamp photodistributed. Photo-irradiation intensity to actinic energy ray hardening resin composition, each compositions is different, and the exposure rate of the effective wavelength region of activation of photo-induced cationic polymerization initiator and/or optical free radical polymerization initiator is preferably 10��2500mW/cm². When to the photo-irradiation intensity of actinic energy ray hardening resin composition lower than 10mW/cm²Time, the response time becomes long; When more than 2500mW/cm²Time, due to the heat release when heat radiated from lamp and actinic energy ray hardening resin composition are polymerized, actinic energy ray hardening resin composition generation xanthochromia or polarizing coating likely can be made aging, actinic energy ray hardening resin composition is irradiated the time of light, still can be controlled for each compositions, it is not particularly limited, is preferably set to 10��2500mJ/cm with the accumulated light that the long-pending form of exposure rate and irradiation time represents².When to the accumulated light of actinic energy ray hardening resin composition lower than 10mJ/cm²Time, the generation of the spike coming from polymerization initiator is insufficient, it is possible to the solidification that can make obtained adhesive layer is insufficient. It addition, when accumulated light is more than 2500mJ/cm²Time, irradiation time becomes very long, is unfavorable for improving productivity ratio. It should be noted that the scope internal radiation actinic energy ray not declined preferably in various performances such as the degree of polarization of polarizing coating, absorbancies.

<liquid crystal indicator>

Optical laminate 10��12 for the present invention, is reconfigured at 1 liquid crystal cell substrate at this liquid crystal cell substrate 1 with the opposition side, face being pasted with polarization plates 5, is clamped in by liquid crystal between the two, thus can make liquid crystal cells or liquid crystal panel. With this liquid crystal cells or liquid crystal panel for display element, may make up liquid crystal indicator, can also with the liquid crystal cells of sealing liquid crystal state between 2 liquid crystal cell substrates originally as the liquid crystal cell substrate 1 in Fig. 1��3, at it, polarization plates is pasted according to the present invention in the surface of one or both, makes liquid crystal panel. Because the excellent in te pins of durability of the optical laminate relative thermal impact test etc. of the present invention, so operating as described above the excellent in te pins of durability of the liquid crystal indicator relative thermal impact test too etc. of making, and thin light can be sought.

Embodiment

Below, enumerate embodiment, specifically describe the present invention further, but the present invention is not by the restriction of these examples. In embodiment, represent that " part " and " % " of consumption or content is not as long as illustrating and being weight basis.

(manufacturing example 1: the making of polarizing coating)

After the polyvinyl alcohol film of average degree of polymerization about 2400, the thickness 75 ��m of 99.9 moles of more than % of saponification degree is impregnated in the pure water of 30 DEG C, it is immersed at 30 DEG C in the aqueous solution that weight ratio is 0.02/2/100 of iodine/potassium iodide/water. Thereafter, in 56.5 DEG C of aqueous solutions that weight ratio is 12/5/100 being immersed in potassium iodide/boric acid/water. Then, after cleaning with the pure water of 8 DEG C, it is dried at 65 DEG C, obtains the polarizing coating that gas absorption quantity in polyvinyl alcohol has the thickness about 30 ��m of iodine. Stretching the main operation processed at iodine staining and boric acid to implement, total draw ratio is 5.3 times.

(manufacturing example 2: the making of polarization plates)

In polyethylene terephthalate (PET) film (Toyo Boseki K. K's system; ester film E7002 spins in Japan) one side; use coating machine (first physics and chemistry Co., Ltd. system; rod coating machine), coating forms the actinic energy ray hardening resin composition of the consisting of of the protective clear layer of polarizing coating.

(protective clear layer actinic energy ray hardening resin composition)

3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate (Daicel chemical company system, �� �� �� �� �� De 2021P) 35 parts

Double; two (3-ethyl-3-oxetanylmethyl) 15 parts of ether (Toagosei Co., Ltd's system, ARONOXETANEOXT-221)

The diacrylate (chemical industry Co., Ltd. of Xin Zhong village system, A-DOG) 50 parts of the acetal compound of hydroxyl trimethyl-acetaldehyde and trimethylolpropane

2-hydroxy-2-methyl-1-phenyl-propane-1-ketone (vapour Bagong department makes, DAROCUR1173, optical free radical polymerization initiator) 2.25 parts

Double; two 2.25 parts of hexafluorophosphate system photo-induced cationic polymerization initiator (Asahi Denka Co., Ltd.'s system, �� �� �� �� �� �� �� mono-SP-150) of 4.4 '-bis-(diphenyl sulfonium base) diphenyl sulfur

It should be noted that above-mentioned A-DOG (diacrylate of the acetal compound of hydroxyl trimethyl-acetaldehyde and trimethylolpropane) is the compound with following formula structure.

When being coated with actinic energy ray hardening resin composition, owing to thickness is according to viscosity B coefficent, therefore, by changing the numbering adjustment thickness wiry of bar coater. Then, use sticker (Off �� �� �� Co., Ltd. system, LPA3301), will there is the PET film of the film of above-mentioned actinic energy ray hardening resin composition, by make film side become with the sticking veneer of polarizing coating in the way of be pasted onto manufacture example 1 make polarizing coating a face on.

For these stickup product, utilize the D valve (Japanese: D �� Le Block) of spoke deep UV system house of the U.S. with accumulated light 1500mJ/cm²Irradiation ultraviolet radiation, makes the actinic energy ray hardening resin composition being arranged in the one side of polarizing coating solidify. Thereafter, PET film is peeled off, is made the polarization plates that one side has the protective clear layer of the solidfied material comprising actinic energy ray hardening resin composition. The thickness of polarization plates now is about 35 ��m.

(manufacturing example 3: the preparation of adhesive compound)

Mix following composition, obtain ultra-violet solidified adhesive compound.

(ultra-violet solidified adhesive compound)

3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate (Daicel chemical company system, �� �� �� �� �� De 2021P) 75 parts

Double; two (3-ethyl-3-oxetanylmethyl) 25 parts of ether (Toagosei Co., Ltd's system, ARONOXETANEOXT-221)

Double; two 5 parts of hexafluorophosphate system photo-induced cationic polymerization initiator (Daicel-�� �� �� �ĥ� company UVACURE1590) of 4,4 '-bis-(diphenyl sulfonium base) diphenyl sulfur

Silicon-type levelling agent (Dong Li Dow Corning Corporation system, SH710) 0.2 part

<embodiment 1>

The polarization plates that manufacture example 2 makes is cut into the sample size of 8cm �� 8cm, on the face being formed without protective clear layer, uses coating machine (first physics and chemistry Co., Ltd. system, bar coater) coating to manufacture the adhesive compound that example 3 is obtained. Now, owing to when coating binder compositions, thickness is according to viscosity B coefficent, therefore, changing the numbering wiry of bar coater, the mode that the thickness after making solidification is 2 ��m is adjusted. Then, on a face of transparent glass substrate (forming the material of liquid crystal cell substrate), use sticker (Off �� �� �� Co., Ltd. system, LPA3301), by make this film side become with the sticking veneer of transparent glass substrate in the way of paste the polarization plates of the film with above-mentioned adhesive compound. For these stickup product, utilize the D valve of spoke deep UV system house of the U.S. with accumulated light 1500mJ/cm²Irradiation ultraviolet radiation, makes adhesive compound solidify, and makes optical laminate.

<embodiment 2>

The one side being used in polyvinyl alcohol film gas absorption quantity and having the polarizing coating of iodine pastes polarization plates (Sumitomo Chemical Co's system of the protecting film formed by the triacetyl cellulose (TAC) of thickness 40 ��m by polyethenol series adhesive; SR0661A-XNSY; thickness about 70 ��m) replace manufacturing the polarization plates that example 2 makes; in addition; operate similarly to Example 1, make optical laminate.

<comparative example 1>

Acrylic pressure-sensitive adhesive is used to replace ultra-violet solidified adhesive compound; on a face of transparent glass substrate; the face (polarization face) being not provided with protective clear layer manufacturing the polarization plates that example 2 makes is pasted by this acrylic pressure-sensitive adhesive; in the autoclave of 50 DEG C, with pressure 5kg/cm²(about 0.5MPa) processes 20 minutes, in addition, operates similarly to Example 1, makes optical laminate.

<comparative example 2>

Acrylic pressure-sensitive adhesive is used to replace ultra-violet solidified adhesive compound; on a face of transparent glass substrate; the face (polarization face) not having bonding protective film of polarization plates is pasted, in the autoclave of 50 DEG C, with pressure 5kg/cm by this acrylic pressure-sensitive adhesive²(about 0.5MPa) processes 20 minutes, in addition, operates similarly to Example 2, makes optical laminate.

<bonding long duration test>

The durability of the optical laminate of above-described embodiment and comparative example making is evaluated with following methods.

[endurance test method]

For optical laminate, carry out the keeping heat resistant test of 500 hours under the drying condition of temperature 90 DEG C. It addition, keep the processes of 1 hour for 1 circulation with the process keeping 1 hour at-35 DEG C with at 70 DEG C, carry out the thermal shock test of 300 these circulations repeatedly. In testing at two, the polarization plates after being tested by visual observations, it is evaluated by following standard. Show the result in table 1.

(heat resistant test)

A: be hardly visible float, peel off, the cosmetic variation such as foaming.

B: can see slightly float, peel off, the cosmetic variation such as foaming.

C: can clearly be seen that float, peel off, the cosmetic variation such as foaming.

(thermal shock test)

A: can't see crackle or breakage on polarizing coating completely.

B: it can be seen that crackle or breakage on polarizing coating.

[table 1]

Example No.	The stickup of glass and polarization plates	Polarization plates thickness (��m)	Heat resistant test 90 DEG C dry	Thermal shock test -35��/70��
					Embodiment 1	Ultra-violet solidified adhesive	35	A	A
Embodiment 2	Ultra-violet solidified adhesive	70	A	A
					Comparative example 1	Adhesive	35	C	B
Comparative example 2	Adhesive	70	C	B

The optical laminate of embodiment 1 uses to be had and the polarization plates of comparative example 1 same thickness, additionally, the optical laminate of embodiment 2 uses to be had and the polarization plates of comparative example 2 same thickness, thin light is achieved according to the optical laminate of embodiments of the invention 1 and 2, and by using the bonding polarization plates of adhesive and the glass substrate of actinic energy ray (ultraviolet) hardening resin composition containing epoxy compound, show the durability of excellence.

Claims (4)

1. an optical laminate, wherein,

Possess:

Liquid crystal cell substrate;

Adhesive layer, it contacts and stacked with the surface of described liquid crystal cell substrate, and is formed by the solidfied material of the actinic energy ray hardening resin composition containing the epoxy compound in molecule with at least 1 epoxy radicals;

Polarization plates, it contacts and stacked with the surface of described adhesive layer, and has dichromatic pigment gas absorption quantity polarizing coating in polyvinyl alcohol resin, and the thickness of described polarization plates is less than 100 ��m,

Described polarization plates possesses: contact and the described polarizing coating of stacking and the protective clear layer of stacking on the face with the described adhesive layer opposition side in described polarizing coating with the surface of described adhesive layer,

Described liquid crystal cell substrate is made up of glass.

2. optical laminate according to claim 1, wherein,

Described actinic energy ray hardening resin composition is possibly together with oxetanes based compound.

3. optical laminate according to claim 1, wherein,

The thickness of described adhesive layer is less than 10 ��m.

4. a manufacture method for optical laminate, wherein,

Possess:

On the surface of the described polarizing coating of the polarization plates that thickness is less than 100 ��m with dichromatic pigment gas absorption quantity polarizing coating in polyvinyl alcohol resin, form the operation of the adhesive layer formed by the actinic energy ray hardening resin composition containing the epoxy compound in molecule with at least 1 epoxy radicals;

At liquid crystal cell substrate, paste the operation of the described adhesive layer on the surface being formed at described polarizing coating; With

Irradiate actinic energy ray, make the operation that described adhesive layer solidifies,

Described liquid crystal cell substrate is made up of glass.