CN112771421A - Polarizing plate composite and image display device - Google Patents

Abstract

The invention provides a polarizing plate composite, which sequentially comprises a linear polarizing plate, an 1/2 wavelength layer, a 1 st adhesive layer formed by curing an active energy ray curing adhesive, and a 1/4 wavelength layer, wherein an angle formed by a fast axis of the 1/2 wavelength layer and a transmission axis of the linear polarizing plate is more than 10 degrees and less than 20 degrees, and an absolute value of a difference between a refractive index of the 1 st adhesive layer at a wavelength of 589nm and a refractive index of the 1/2 wavelength layer at the fast axis direction at the wavelength of 589nm is less than 0.05.

Description

Polarizing plate composite and image display device

Technical Field

The present invention relates to a polarizing plate composite and an image display device having the polarizing plate composite.

Background

Conventionally, in an image display device, a method of suppressing a decrease in visibility due to reflection of external light by disposing an optical layered body having antireflection performance on the visible side of an image display panel has been employed.

As an optical laminate having antireflection properties, a circularly polarizing plate comprising a linearly polarizing plate and a retardation layer is known. In the circularly polarizing plate, the external light directed to the image display panel is converted into linearly polarized light by the linearly polarizing plate and is converted into circularly polarized light by the subsequent phase difference layer. Although the external light converted into circularly polarized light is reflected on the surface of the image display panel, the direction of rotation of the polarization plane is reversed at the time of the reflection, and the external light is converted into linearly polarized light by the retardation layer and then blocked by the subsequent linear polarizing plate. As a result, the emission to the outside is significantly suppressed.

Jp 2018 a 17996 (patent document 1) describes that, in a polarizing plate with a retardation layer having a plurality of retardation layers, unevenness of reflected light can be suppressed and visibility can be improved by adjusting the difference in average refractive index between the plurality of retardation layers.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-17996

Disclosure of Invention

Problems to be solved by the invention

The present invention aims to provide a novel polarizing plate composite in which the occurrence of interference unevenness is suppressed, and an image display device provided with the composite polarizing plate.

Means for solving the problems

The invention provides a polarizing plate composite and an image display device shown below.

[ 1] A polarizing plate composite comprising a linear polarizing plate, an 1/2-wavelength layer, a 1 st adhesive layer obtained by curing an active energy ray-curable adhesive, and a 1/4-wavelength layer in this order,

the angle formed by the fast axis of the 1/2 wavelength layer and the transmission axis of the linearly polarizing plate is 10 DEG to 20 DEG,

the absolute value of the difference between the refractive index at the wavelength of 589nm of the 1 st adhesive layer and the refractive index in the fast axis direction at the wavelength of 589nm of the 1/2 th wavelength layer is less than 0.05.

The polarizing plate composite according to [ 1], wherein the refractive index of the 1 st adhesive layer at a wavelength of 589nm is less than 1.55.

The polarizing plate composite according to any one of [ 1] and [ 2], wherein an average in-plane refractive index of the 1/4 wavelength layer at a wavelength of 589nm is less than 1.58, and the average in-plane refractive index is an average of a refractive index in a fast axis direction and a refractive index in a slow axis direction.

The polarizing plate composite according to any one of [ 1] to [ 3 ], wherein an absolute value of a difference between a refractive index at a wavelength of 589nm of the 1 st adhesive layer and an in-plane average refractive index at a wavelength of 589nm of the 1/4 th wavelength layer, which is an average value of a refractive index in a fast axis direction and a refractive index in a slow axis direction, is less than 0.05.

The polarizing plate composite according to any one of [ 1] to [4 ], which is a circularly polarizing plate.

The polarizing plate composite according to any one of [ 1] to [ 5 ], wherein the 1/2 wavelength layer includes a retardation-developing layer as a liquid crystal layer.

The polarizing plate composite according to any one of [ 1] to [ 6 ], wherein the 1/4 wavelength layer includes a retardation developing layer as a liquid crystal layer.

The polarizing plate composite according to any one of [ 1] to [ 7 ], wherein the thickness of the 1 st adhesive layer is 5 μm or less.

An image display device comprising an image display panel and the polarizing plate composite according to any one of [ 1] to [ 8 ] disposed on a visible side of the image display panel.

The image display device according to [ 9 ], wherein the polarizing plate composite is disposed in a direction in which the linear polarizing plate is positioned on a visible side.

[ 11 ] an image display device according to any one of [ 9 ] and [ 10 ], which is an organic electroluminescent display device.

Effects of the invention

According to the polarizing plate composite of the present invention, interference unevenness can be suppressed.

Drawings

Fig. 1 is a schematic cross-sectional view schematically showing an example of the polarizing plate composite of the present invention.

Fig. 2 is a schematic cross-sectional view schematically showing an example of a retardation layer including a liquid crystal layer as a retardation developing layer.

Fig. 3(a) to (D) are schematic cross-sectional views schematically showing an example of each manufacturing step of the method for manufacturing a polarizing plate composite of the present invention.

Fig. 4(a) and (B) are schematic cross-sectional views schematically showing another example of each manufacturing step of the method for manufacturing a polarizing plate composite of the present invention.

Detailed Description

Hereinafter, the polarizing plate composite and the image display device of the present invention will be described with reference to the drawings.

[ composite phase difference plate ]

Fig. 1 is a schematic cross-sectional view schematically showing an example of the polarizing plate composite of the present invention. As shown in fig. 1, the polarizing plate composite 10 includes a linear polarizing plate 13, a 2 nd adhesive layer 22, an 1/2 wavelength layer 11, a 1 st adhesive layer 21, and a 1/4 wavelength layer 12 stacked in this order. In the polarizing plate composite 10, the angle formed by the fast axis of the 1/2 wavelength layer 11 and the transmission axis of the linear polarizing plate 13 is 10 ° or more and 20 ° or less, preferably 12 ° or more and 18 ° or less, and more preferably about 15 °. In the polarizing plate composite 10, the angle formed by the fast axis of the 1/4 wavelength layer 12 and the transmission axis of the linear polarizing plate 13 is preferably 70 ° or more and 80 ° or less, more preferably 72 ° or more and 78 ° or less, and still more preferably about 75 °. In the polarizing plate composite 10, the angle formed by the slow axis of the 1/2 wavelength layer 11 and the slow axis of the 1/4 wavelength layer 12 is preferably 55 ° or more and 65 ° or less, more preferably 57 ° or more and 63 ° or less, and still more preferably about 60 °. By laminating the polarizing plate composite 10 so as to form such an angle, the polarizing plate composite 10 can be suitably used as a circular polarizing plate.

Even if the relationship of angles other than the above-described angle is satisfied, a polarizing plate composite that can be suitably used as a circular polarizing plate can be configured, and by satisfying the above-described relationship, even when the refractive index at a wavelength of 589nm of the 1 st adhesive layer is less than 1.55, interference unevenness can be effectively suppressed.

The thickness of the polarizing plate composite 10 is preferably 30 μm to 50 μm, more preferably 30 μm to 200 μm, and still more preferably 30 μm to 150 μm, from the viewpoint of thinning.

For the 1 st adhesive layer 21, the refractive index at a wavelength of 589nm is set to "refractive index n 21". The 1 st adhesive layer 21 has no phase difference, and the refractive index in any direction can be regarded as the same value. Thus, the "refractive index n 21" may be a refractive index in any direction.

For the 1/2 wavelength layer 11, the refractive index in the slow axis direction at a wavelength of 589nm was defined as "refractive index n11_x", the refractive index in the fast axis direction is defined as" refractive index n11_y", the refractive index in the thickness direction is assumed to be" refractive index n11_z", will n11_xAnd n11_yIs set as "average in-plane refractive index n11_x，y", will n11_xAnd n11_yAnd n11_zIs set as "three-dimensional average refractive index n11x,_y，z". In-plane average refractive index n11_x，yAnd a three-dimensional average refractive index n11_x，y，zEach value is calculated by the following formula (1) and formula (2).

n11_x，y＝(n11_x+n11_y)/2 (1)

n11_x，y，z＝(n11_x+n11_y+n11_z)/3 (2)

For the 1/4 wavelength layer 12, the refractive index in the slow axis direction at a wavelength of 589nm was set to "refractive index n12_x", will fast axisThe refractive index of the direction is set to "refractive index n12_y", the refractive index in the thickness direction is assumed to be" refractive index n12_z", will n12_xAnd n12_yIs set as "average in-plane refractive index n12_x，y", will n12_xAnd n12_yAnd n12_zIs set as "three-dimensional average refractive index n12x,_y，z". In-plane average refractive index n12_x，yAnd a three-dimensional average refractive index n12_x，y，zEach value is calculated by the following formula (3) and formula (4).

n12_x，y＝(n12_x+n12_y)/2 (3)

n12_x，y，z＝(n12_x+n12_y+n12_z)/3 (4)

< No. 1 adhesive layer >

The 1 st adhesive layer 21 is formed by curing an active energy ray-curable adhesive. The thickness of the 1 st adhesive layer 21 is preferably 0.1 to 50 μm, more preferably 0.1 to 5 μm.

As the refractive index n21 at a wavelength of 589nm of the 1 st adhesive layer 21 and the refractive index n11 in the fast axis direction at a wavelength of 589nm of the 1/2 wavelength layer 11_yThe absolute value X1 calculated by the formula (5) of the difference (a) is less than 0.05, preferably 0.04 or less.

X1＝|n11_y-n21| (5)

By making the 1 st adhesive layer 21 and the 1/2 th wavelength layer 11 satisfy the above-described relationship in terms of refractive index, interference unevenness can be suppressed. In order to satisfy the above relationship in the refractive index of the 1 st adhesive layer 21 and the 1/2 wavelength layer 11, for example, the composition of the active energy ray-curable adhesive used for forming the 1 st adhesive layer 21 or the liquid crystal material used for forming the 1/2 wavelength layer 11 may be adjusted.

As the refractive index n21 at a wavelength of 589nm of the 1 st adhesive layer 21 and the in-plane average refractive index n12 at a wavelength of 589nm of the 1/4 wavelength layer 12_x，yThe absolute value X2 calculated by the formula (6) of the difference of (a) is preferably less than 0.05, and more preferably 0.04 or less.

X2＝|n12_x，y-n21| (6)

By making the 1 st adhesive layer 21 and the 1/4 th wavelength layer 12 satisfy the above-described relationship in terms of refractive index, interference unevenness can be suppressed. In order to satisfy the above relationship in the refractive index of the 1 st adhesive layer 21 and the 1/4 wavelength layer 12, for example, the composition of the active energy ray-curable adhesive used for forming the 1 st adhesive layer 21 or the liquid crystal material used for forming the 1/4 wavelength layer 11 may be adjusted.

The refractive index n21 at a wavelength of 589nm of the 1 st adhesive layer 21 is, for example, less than 1.55.

In the present invention, even when the refractive index n21 of the 1 st adhesive layer 21 is less than 1.55, interference unevenness can be suppressed.

The active energy ray-curable adhesive is an adhesive which is cured by irradiation with an active energy ray. Examples thereof include cationically polymerizable active energy ray-curable adhesives containing an epoxy compound and a cationic polymerization initiator; a radically polymerizable active energy ray-curable adhesive containing an acrylic curing component and a radical polymerization initiator; an active energy ray-curable adhesive containing both a cationically polymerizable curing component such as an epoxy compound and a radically polymerizable curing component such as an acrylic compound, and containing a cationic polymerization initiator and a radical polymerization initiator; and an electron beam-curable adhesive which is cured by irradiating an active energy ray-curable adhesive containing no initiator with an electron beam. Since radical polymerization tends to cause large curing shrinkage, a cationically polymerizable active energy ray-curable adhesive containing an epoxy compound and a cationic polymerization initiator is preferable.

An active energy ray-curable adhesive which is prepared by selecting an epoxy compound capable of cationic polymerization, which is liquid at room temperature and has appropriate fluidity even in the absence of a solvent, and which is blended with a suitable cationic polymerization initiator, and which imparts appropriate cured adhesive strength, can be used without a drying apparatus which is usually necessary in the step of bonding the 1/2 wavelength layer and the 1/4 wavelength layer. In addition, the curing rate can be accelerated by irradiating the resin with an appropriate amount of active energy rays, and the production rate can be increased.

The epoxy compound used in such an adhesive may be, for example, an aromatic compound having a hydroxyl group or a glycidyl etherate of a chain compound, a glycidyl aminated compound of an amino group-containing compound, an epoxide of a chain compound having a C — C double bond, an alicyclic epoxy compound in which a glycidyloxy group or an epoxyethyl group is bonded directly or via an alkylene group to a saturated carbocyclic ring, or an epoxy group is bonded directly to a saturated carbocyclic ring. These epoxy compounds may be used alone or in combination of two or more. Among them, an alicyclic epoxy compound is preferably used because of its excellent cationic polymerizability.

The glycidyl etherate of an aromatic compound or a chain compound having a hydroxyl group can be produced, for example, by a method of addition-condensing epichlorohydrin with a hydroxyl group of the aromatic compound or the chain compound under an alkaline condition. Examples of the glycidyl etherate of the aromatic compound or chain compound having a hydroxyl group include diglycidyl ethers of bisphenols, polyaromatic epoxy resins, and diglycidyl ethers of alkylene glycols or polyalkylene glycols.

Examples of the diglycidyl ether of a bisphenol include a glycidyl ether of bisphenol a and an oligomer thereof, a glycidyl ether of bisphenol F and an oligomer thereof, and a glycidyl ether of 3, 3', 5, 5 ' -tetramethyl-4, 4' -biphenol and an oligomer thereof.

Examples of the polyaromatic epoxy resin include glycidyl etherate of phenol novolac resin, glycidyl etherate of cresol novolac resin, glycidyl etherate of phenol aralkyl resin, glycidyl etherate of naphthol aralkyl resin, glycidyl etherate of phenol dicyclopentadiene resin, and the like. Further, glycidyl etherate of trisphenol and oligomer thereof are also included in the polyaromatic epoxy resin.

Examples of the diglycidyl ether of an alkylene glycol or polyalkylene glycol include a glycidyl etherate of ethylene glycol, a glycidyl etherate of diethylene glycol, a glycidyl etherate of 1, 4-butanediol, and a glycidyl etherate of 1, 6-hexanediol.

The glycidyl amide compound of a compound having an amino group can be produced, for example, by addition-condensing epichlorohydrin with the amino group of the compound under alkaline conditions. The compound having an amino group may have a hydroxyl group at the same time. Examples of the glycidyl amides of such compounds having an amino group include glycidyl amides of 1, 3-phenylenediamine and oligomers thereof, glycidyl amides of 1, 4-phenylenediamine and oligomers thereof, glycidyl amides and glycidyl ethers of 3-aminophenol and oligomers thereof, glycidyl amides and glycidyl ethers of 4-aminophenol and oligomers thereof, and the like.

An epoxide compound of a chain compound having a C — C double bond can be produced by a method of epoxidizing the C — C double bond of the chain compound with a peroxide under an alkaline condition. The chain compound having a C — C double bond includes butadiene, polybutadiene, isoprene, pentadiene, hexadiene, and the like. Terpenes having a double bond may be used as an epoxidation raw material, and as acyclic monoterpenes, linalool and the like are available. The peroxide used in the epoxidation may be, for example, hydrogen peroxide, peracetic acid, tert-butyl hydroperoxide, or the like.

The alicyclic epoxy compound having a glycidyloxy group or an epoxyethyl group bonded to a saturated carbocyclic ring directly or via an alkylene group may be a glycidyl etherate of a hydrogenated polyhydroxy compound obtained by hydrogenating an aromatic ring of an aromatic compound having a hydroxyl group as exemplified by the above-mentioned bisphenols, a glycidyl etherate of a cycloalkane compound having a hydroxyl group, an epoxide of a cycloalkane compound having a vinyl group, or the like.

Examples of commercially available Epoxy compounds that can be easily obtained from the above-described Epoxy compounds include "jER" series sold by mitsubishi Chemical corporation, "EPICLON" sold by DIC corporation, "Epototo (registered trademark)" sold by doe Chemical corporation, "ADEKA RESIN (registered trademark)" sold by ADEKA, DENACOL (registered trademark) "sold by Nagase ChemteX corporation," DOW Epoxy "sold by DOW Chemical corporation, and" TEPIC (registered trademark) "sold by japanese Chemical corporation, which are trade names.

On the other hand, an alicyclic epoxy compound having an epoxy group directly bonded to a saturated carbocyclic ring can be produced, for example, by a method of epoxidizing a C — C double bond of a non-aromatic cyclic compound having a C — C double bond in the ring with a peroxide under basic conditions. Examples of the non-aromatic cyclic compound having a C — C double bond in the ring include a compound having a cyclopentene ring, a compound having a cyclohexene ring, and a polycyclic compound in which at least 2 carbon atoms are further bonded to the cyclopentene ring or the cyclohexene ring to form an additional ring. Non-aromatic cyclic compounds having a C-C double bond within the ring may have additional C-C double bonds outside the ring. Examples of the non-aromatic cyclic compound having a C-C double bond in the ring include cyclohexenyls, 4-vinylcyclohexenes, and limonene and α -pinenes, which are monocyclic monoterpenes.

The alicyclic epoxy compound having an epoxy group directly bonded to a saturated carbocyclic ring may be a compound having an alicyclic structure in which at least 2 epoxy groups having a ring directly bonded thereto as described above are formed in the molecule via an appropriate linking group. The linking group as referred to herein includes, for example, an ester bond, an ether bond, an alkylene bond and the like.

Specific examples of the alicyclic epoxy compound in which an epoxy group is directly bonded to a saturated carbon ring include the following compounds.

3, 4-epoxycyclohexanecarboxylic acid 3, 4-epoxycyclohexylmethyl ester,

1, 2-epoxy-4-vinylcyclohexane,

1, 2-epoxy-4-epoxyethylcyclohexane,

1, 2-epoxy-1-methyl-4- (1-methylepoxyethyl) cyclohexane,

3, 4-epoxycyclohexylmethyl (meth) acrylate,

An adduct of 2, 2-bis (hydroxymethyl) -1-butanol and 4-epoxyethyl-1, 2-epoxycyclohexane,

Ethylene bis (3, 4-epoxycyclohexanecarboxylate),

Oxydiethylene bis (3, 4-epoxycyclohexanecarboxylate),

1, 4-cyclohexanedimethylbis (3, 4-epoxycyclohexanecarboxylate),

3- (3, 4-epoxycyclohexylmethoxycarbonyl) propyl 3, 4-epoxycyclohexanecarboxylate and the like.

The alicyclic epoxy compound described above in which an epoxy group is directly bonded to a saturated carbocyclic ring can be easily obtained as a commercially available product, and examples thereof include "Celoxide (registered trademark)" series and "Cyclomer (registered trademark)" series sold by Daicel, Inc., and "cyclocure UVR" series sold by DOW Chemical company, respectively.

The curable adhesive containing an epoxy compound may further contain an active energy ray-curable compound other than the epoxy compound. Examples of the active energy ray-curable compound other than the epoxy compound include an oxetane compound and an acrylic compound. Among them, oxetane compounds are preferably used in combination because of the possibility of accelerating the curing speed in cationic polymerization.

The oxetane compound is a compound having a 4-membered cyclic ether in the molecule, and examples thereof include the following compounds.

1, 4-bis [ (3-ethyloxetan-3-yl) methoxymethyl ] benzene,

3-ethyl-3- (2-ethylhexyloxymethyl) oxetane,

Bis (3-ethyl-3-oxetanylmethyl) ether,

3-ethyl-3- (phenoxymethyl) oxetane,

3-ethyl-3- (cyclohexyloxymethyl) oxetane,

Phenol novolac oxetane,

Xylylene dioxirane,

1, 3-bis [ (3-ethyloxetan-3-yl) methoxy ] benzene and the like.

The oxetane compound can be easily obtained as a commercially available product, and examples thereof include "aroxoetane (registered trademark)" series sold by east asia synthesis (ltd.), and "etarnacoll (registered trademark)" series sold by yukyu xingdu ltd.

In the curable compound containing an epoxy compound or an oxetane compound, it is preferable to use a curable compound which is not diluted with an organic solvent or the like in order to render an adhesive containing the epoxy compound or the oxetane compound solvent-free. In addition, as other components constituting the adhesive, a small amount of a component containing a cationic polymerization initiator and a sensitizer described later is preferably used in the form of powder or liquid alone, in which the organic solvent is removed and dried, as compared with a component dissolved in the organic solvent.

The cationic polymerization initiator is a compound that generates a cationic species upon irradiation with active energy rays, such as ultraviolet rays. Any cationic polymerization initiator may be used as long as it can impart the required adhesive strength and curing speed to the adhesive containing the initiator, and examples thereof include aromatic diazonium salts; onium salts such as aromatic iodonium salts and aromatic sulfonium salts; iron-arene complexes, and the like. These cationic polymerization initiators may be used alone or in combination of two or more.

Examples of the aromatic diazonium salt include the following.

Benzenediazonium hexafluoroantimonate,

Benzenediazonium hexafluorophosphate,

Benzenediazonium hexafluoroborate, and the like.

Examples of the aromatic iodonium salt include the following.

Diphenyliodonium tetrakis (pentafluorophenyl) borate,

Diphenyliodonium hexafluorophosphate,

Diphenyliodonium hexafluoroantimonate,

Bis (4-nonylphenyl) iodonium hexafluorophosphate, and the like.

Examples of the aromatic sulfonium salt include those shown below.

Triphenylsulfonium hexafluorophosphate,

Triphenylsulfonium hexafluoroantimonate,

Triphenylsulfonium tetrakis (pentafluorophenyl) borate,

Diphenyl (4-phenylthiophenyl) sulfonium hexafluoroantimonate,

4, 4' -bis (diphenylsulfonium) diphenylsulfide bis (hexafluorophosphate),

4, 4' -bis (di (beta-hydroxyethoxyphenyl) sulfonium) diphenylsulfide bis (hexafluoroantimonate),

4, 4' -bis (di (beta-hydroxyethoxyphenyl) sulfonium ] diphenylsulfide bis (hexafluorophosphate),

7- [ bis (p-toluoyl) sulfonium ] -2-isopropylthioxanthone hexafluoroantimonate,

7- [ bis (p-toluoyl) sulfonium ] -2-isopropylthioxanthone tetrakis (pentafluorophenyl) borate,

4-phenylcarbonyl-4' -diphenylsulfonium diphenylsulfide hexafluorophosphate,

4- (p-tert-butylphenylcarbonyl) -4' -diphenylsulfonium diphenylsulfide hexafluoroantimonate,

4- (p-tert-butylphenylcarbonyl) -4' -bis (p-toluoyl) sulfonium-diphenylsulfide tetrakis (pentafluorophenyl) borate, etc.

Examples of the iron-arene complex include the following.

Xylene-cyclopentadienyl iron (II) hexafluoroantimonate,

Cumene-cyclopentadienyl iron (II) hexafluorophosphate,

Xylene-cyclopentadienyl iron (II) tris (trifluoromethanesulfonyl) methide, and the like.

Among the cationic polymerization initiators, aromatic sulfonium salts are preferably used because they have ultraviolet absorption characteristics even in a wavelength region of 300nm or more and can provide an adhesive layer having excellent curability and good mechanical strength and adhesive strength.

Examples of the cationic polymerization initiator include "Kayarad (registered trademark)" series sold by japan Chemical corporation, "Cyracure UVI" series sold by DOW Chemical corporation, "CPI" series sold by San-Apro corporation, "TAZ", "BBI" and "DTS" photoacid generators sold by Midori Chemical corporation, "ADEKA Optomer" series sold by ADEKA, and "RHODORSIL (registered trademark)" sold by RHODIA corporation.

In the active energy ray-curable adhesive, the cationic polymerization initiator is usually incorporated in an amount of 0.5 to 20 parts by mass, preferably 1 to 15 parts by mass, based on 100 parts by mass of the total amount of the active energy ray-curable adhesive. If the amount is too small, curing may become insufficient, and the mechanical strength and adhesive strength of the adhesive layer may be reduced. If the amount is too large, the ionic substance in the adhesive layer increases, and the moisture absorption of the adhesive layer may increase, thereby degrading the durability of the polarizing plate obtained.

When the active energy ray-curable adhesive is used in an electron beam-curable type, a photopolymerization initiator is not particularly required to be contained in the composition, but when the adhesive is used in an ultraviolet-curable type, a photo radical generator is preferably used. Examples of the photo-radical generator include hydrogen abstraction-type photo-radical generators and cleavage-type photo-radical generators.

Examples of the hydrogen abstraction-type photoradical generator include naphthalene derivatives such as 1-methylnaphthalene, 2-methylnaphthalene, 1-fluoronaphthalene, 1-chloronaphthalene, 2-chloronaphthalene, 1-bromonaphthalene, 2-bromonaphthalene, 1-iodonaphthalene, 2-iodonaphthalene, 1-naphthol, 2-naphthol, 1-methoxynaphthalene, 2-methoxynaphthalene and 1, 4-dicyanonaphthalene, anthracene, 1, 2-benzanthracene, 9, 10-dichloroanthracene, 9, 10-dibromoanthracene, 9, 10-diphenylanthracene, 9-cyanoanthracene, 9, 10-dicyanoanthracene and 2, 6, 9, 10-tetracyanoanthracene, pyrene derivatives, carbazole, 9-methylcarbazole, 9-phenylcarbazole, 9-prop-2-enyl-9H-carbazole, 9-propyl-9H-carbazole, 9-vinylcarbazole, 9H-carbazole-9-ethanol, 9-methyl-3-nitro-9H-carbazole, 9-methyl-3, 6-dinitro-9H-carbazole, 9-octanoylcarbazole, 9-carbazolmethanol, 9-carbazolpropionic acid, 9-carbazolpropionitrile, 9-ethyl-3, 6-dinitro-9H-carbazole, 9-ethyl-3-nitrocarbazole, 9-ethylcarbazole, 9-isopropylcarbazole, 9- (ethoxycarbonylmethyl) carbazole, 9- (morpholinylmethyl) carbazole, 9-acetylcarbazole, 9-allylcarbazole, 9-benzyl-9H-carbazole, 9-ethylcarbazole, 9H-carbazol, 9-, 9-carbazolacetic acid, 9- (2-nitrophenyl) carbazole, 9- (4-methoxyphenyl) carbazole, 9- (1-ethoxy-2-methyl-propyl) -9H-carbazole, 3-nitrocarbazole, 4-hydroxycarbazole, 3, 6-dinitro-9H-carbazole, 3, 6-diphenyl-9H-carbazole, carbazole derivatives such as 2-hydroxycarbazole and 3, 6-diacetyl-9-ethylcarbazole, benzophenone, 4-phenylbenzophenone, 4' -bis (dimethoxy) benzophenone, 4' -bis (dimethylamino) benzophenone, 4' -bis (diethylamino) benzophenone, methyl 2-benzoylbenzoate, methyl 3, 6-di (ethoxyphenyl) carbazole, and the like, Benzophenone derivatives such as 2-methylbenzophenone, 3-methylbenzophenone, 4-methylbenzophenone, 3' -dimethyl-4-methoxybenzophenone and 2, 4, 6-trimethylbenzophenone, aromatic carbonyl compounds, [4- (4-methylphenylsulfanyl) phenyl ] -benzophenone, xanthone, thioxanthone, 2-chlorothioxanthone, 4-chlorothioxanthone, 2-isopropylthioxanthone, 4-isopropylthioxanthone, 2, 4-dimethylthioxanthone, 2, 4-diethylthioxanthone, thioxanthone derivatives such as 1-chloro-4-propoxythioxanthone, and coumarin derivatives.

The cleavage type photo-radical generator is a type that generates a radical by cleaving the compound by irradiation with an active energy ray, and specific examples thereof include aryl alkyl ketones such as benzoin ether derivatives and acetophenone derivatives, oxime ketones, acylphosphine oxides, thiobenzoic acid S-benzoates, titanocene, and derivatives obtained by polymerizing these compounds, but are not limited thereto. Examples of commercially available cleavage type photo radical generators include 1- (4-dodecylbenzoyl) -1-hydroxy-1-methylethyl, 1- (4-isopropylbenzoyl) -1-hydroxy-1-methylethyl, 1-benzoyl-1-hydroxy-1-methylethyl, 1- [4- (2-hydroxyethoxy) -benzoyl ] -1-hydroxy-1-methylethyl, 1- [4- (acryloyloxyethoxy) -benzoyl ] -1-hydroxy-1-methylethyl, diphenyl ketone, phenyl-1-hydroxy-cyclohexyl ketone, benzildimethyl ketal, bis (cyclopentadienyl) -bis (2, 6-difluoro-3-pyrrolyl-phenyl) titanium, (. eta.6-isopropylbenzene) - (. eta.5-cyclopentadienyl) -iron (II) hexafluorophosphate, trimethylbenzoyldiphenylphosphine oxide, bis (2, 6-dimethoxy-benzoyl) - (2, 4, 4-trimethyl-pentyl) -phosphine oxide, bis (2, 4, 6-trimethylbenzoyl) -2, 4-dipentyloxyphenylphosphine oxide or bis (2, 4, 6-trimethylbenzoyl) phenyl-phosphine oxide, (4-morpholinobenzoyl) -1-benzyl-1-dimethylaminopropane, 4- (methylthiobenzoyl) -1-methyl-1-morpholinoethane and the like, however, the present invention is not limited thereto.

In the active energy curing adhesive used in the present invention, the photo radical generator contained in the electron beam curing type, that is, the hydrogen abstraction type or cleavage type photo radical generator may be used alone or in combination of two or more, but a combination of 1 or more of the cleavage type photo radical generators is more preferable in view of stability and curability of the photo radical generator alone. Among the cleavage type photo-radical generators, acylphosphine oxides are preferable, and more specifically, trimethylbenzoyldiphenylphosphine oxide (trade name "DAROCURE TPO"; Ciba Japan, Inc.), bis (2, 6-dimethoxy-benzoyl) - (2, 4, 4-trimethyl-pentyl) -phosphine oxide (trade name "CGI 403"; Ciba Japan, Inc.), or bis (2, 4, 6-trimethylbenzoyl) -2, 4-dipentyloxyphenylphosphine oxide (trade name "Irgacure 819"; Ciba Japan, Inc.) is preferable.

The active energy ray-curable adhesive may contain a sensitizer as necessary. By using a sensitizer, reactivity can be improved, and mechanical strength and adhesive strength of the adhesive layer can be further improved. As the sensitizer, the aforementioned sensitizer can be suitably used.

When a sensitizer is added, the amount of the sensitizer is preferably in the range of 0.1 to 20 parts by mass per 100 parts by mass of the total amount of the active energy ray-curable adhesive.

In the active energy ray-curable adhesive, various additives may be added within a range not impairing the effects thereof. Examples of additives that can be blended include ion traps, antioxidants, chain transfer agents, tackifiers, thermoplastic resins, fillers, flow control agents, plasticizers, and defoaming agents.

These components constituting the active energy ray-curable adhesive are generally used in a state of being dissolved in a solvent. When the active energy ray-curable adhesive contains a solvent, the active energy ray-curable adhesive is applied to the coated surface and dried to obtain an adhesive layer. The component insoluble in the solvent may be in a state dispersed in the system.

The active energy ray-curable adhesive is applied to the adhesive surface of the 1/2 wavelength layer 11 to the 1/4 wavelength layer 12, the adhesive surface of the 1/4 wavelength layer 12 to the 1/2 wavelength layer 11, or both. The surface of 1/2 wavelength layer 11 adhered to 1/4 wavelength layer 12 and the surface of 1/4 wavelength layer 12 adhered to 1/2 wavelength layer 11 may be subjected to corona treatment, plasma treatment, flame treatment, or the like in advance, or may be formed with a primer layer or the like. The thickness of the primer layer is usually about 0.001 to 5 μm, preferably 0.01 μm or more, more preferably 4 μm or less, and still more preferably 3 μm or less. If the primer layer is too thick, the appearance of the composite phase difference plate 5 tends to be poor.

The viscosity of the active energy ray-curable adhesive may be any adhesive having a viscosity that can be applied by various methods, and the viscosity at 25 ℃ is preferably in the range of 10 to 1000 mPasec, more preferably in the range of 20 to 500 mPasec. If the viscosity is too low, it tends to be difficult to form a layer having a desired thickness. On the other hand, if the viscosity is too high, the coating film tends to be difficult to flow and to obtain a uniform coating film without unevenness. The viscosity here is a value measured at 10rpm after the temperature of the adhesive is adjusted to 25 ℃ by using an E-type viscometer.

The active energy ray-curable adhesive can be used in the form of an electron beam-curable adhesive or an ultraviolet-curable adhesive. In the present specification, the active energy ray is defined as an energy ray capable of decomposing a compound that generates an active species to generate an active species. Examples of such active energy rays include visible light, ultraviolet rays, infrared rays, X-rays, α -rays, β -rays, γ -rays, and electron beams.

In the electron beam curing type, any appropriate conditions may be adopted as long as the irradiation conditions of the electron beam are conditions capable of curing the active energy ray-curable adhesive. For example, the acceleration voltage for electron beam irradiation is preferably 5kV to 300kV, and more preferably 10kV to 250 kV. If the acceleration voltage is less than 5kV, the electron beam may not reach the adhesive, resulting in insufficient curing, and if the acceleration voltage is more than 300kV, the penetration force through the sample becomes too strong, causing the electron beam to bounce, and possibly damaging the transparent protective film or the polarizing plate. The dose of irradiation is preferably 5 to 100kGy, and more preferably 10 to 75 kGy. When the irradiation dose is less than 5kGy, the adhesive is not sufficiently cured, and when it exceeds 100kGy, the retardation layer is damaged, the mechanical strength is reduced, yellowing occurs, and desired optical characteristics cannot be obtained.

The electron beam irradiation is usually carried out in an inert gas, but may be carried out in the atmosphere or under a condition where a small amount of oxygen is introduced, if necessary. By appropriately introducing oxygen, oxygen inhibition occurs on the retardation layer surface to which the electron beam first hits, and damage to the retardation layer can be prevented, and the electron beam can be effectively irradiated only to the adhesive.

In the ultraviolet ray curing type, the light irradiation intensity of the active energy ray curing type adhesive is determined depending on each composition of the adhesive, and is not particularly limited, but is preferably 10 to 1000mW/cm². If the intensity of light irradiation to the resin composition is less than 10mW/cm²The reaction time is too long, if the reaction time is more than 1000mW/cm²The heat radiated from the light source and the heat generated during polymerization of the composition may cause yellowing of the constituent material of the adhesive. The irradiation intensity is preferably an intensity in a wavelength region effective for activation of the photo cation polymerization initiator, more preferably an intensity in a wavelength region of a wavelength of 400nm or less, and still more preferably an intensity in a wavelength region of 280 to 320 nm. Irradiating with such light irradiation intensity for 1 or more times, preferably to reach 10mJ/cm²More preferably 100 to 1000mJ/cm²The integrated light quantity is set. If the cumulative amount of light irradiated to the adhesive is less than 10mJ/cm²The generation of active species derived from the polymerization initiator is insufficient, and the curing of the adhesive becomes insufficient. On the other hand, ifThe accumulated light amount is more than 1000mJ/cm²The irradiation time is very long, which is disadvantageous for productivity improvement. In this case, the required integrated light amount in which wavelength region (UVA (320 to 390nm), UVB (280 to 320nm), etc.) is required differs depending on the type of the retardation layer film used, the combination of the types of adhesives, and the like.

The light source used for polymerization and curing of the adhesive by irradiation with an active energy ray in the present invention is not particularly limited, and examples thereof include a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a xenon lamp, a halogen lamp, a carbon arc lamp, a tungsten lamp, a gallium lamp, an excimer laser, an LED light source emitting light having a wavelength range of 380 to 440nm, a chemical lamp, a black light, a microwave-excited mercury lamp, and a metal halide lamp. From the viewpoint of energy stability and device simplicity, an ultraviolet light source having an emission distribution at a wavelength of 400nm or less is preferable.

< 1/2 wavelength layer, 1/4 wavelength layer >

The 1/2 wavelength layer 11 and the 1/4 wavelength layer 12 may be formed of only the retardation-developing layer or may include other layers together with the retardation-developing layer as long as they include at least one retardation-developing layer. Examples of the other layer include a base layer, an alignment film layer, and a protective layer. Note that the other layers do not affect the value of the phase difference. In the present specification, the refractive index of the retardation layer refers to the refractive index of the retardation-exhibiting layer regardless of the presence or absence of other layers.

Examples of the retardation layer include a layer formed by using a liquid crystal compound (hereinafter referred to as a "liquid crystal layer") and a stretched film. The retardation layer is preferably a liquid crystal layer from the viewpoint of reducing the thickness of the polarizing plate composite. The retardation-developing layer as a liquid crystal layer is generally easier to be made thinner than the retardation-developing layer as a stretched film. The thickness of the phase difference-developing layer is preferably 0.5 to 10 μm, more preferably 0.5 to 5 μm. When the 1/2 wavelength layer 11 and the 1/4 wavelength layer 12 include layers other than the retardation-developing layer (base layer, alignment film layer, protective layer, and the like), the overall thickness is preferably 0.5 to 300 μm, and more preferably 0.5 to 150 μm.

The optical properties of the retardation layer can be adjusted by the alignment state of the liquid crystal compound constituting the retardation-developing layer or the stretching method of the stretched film constituting the retardation-developing layer.

(1/2 wavelength layers)

The 1/2 wavelength layer 11 has a function of changing the direction (polarization direction) of linearly polarized light by giving a phase difference of pi (═ λ/2) to the electric field vibration direction (polarization plane) of incident light. When circularly polarized light is incident, the rotation direction of the circularly polarized light can be reversed.

The 1/2 wavelength layer 11 is a layer in which Re (λ), which is an in-plane retardation value at a specific wavelength λ nm, satisfies Re (λ) ═ λ/2. Although Re (λ) ═ λ/2 can be achieved at an arbitrary wavelength in the visible light region, among them, it is preferably achieved at a wavelength of 550 nm. Re (550) as an in-plane retardation value at a wavelength of 550nm preferably satisfies 210nm & lt Re (550) & lt 300 nm. Further, it is more preferable to satisfy 220 nm. ltoreq. Re (550). ltoreq.290 nm.

1/2 refractive index of the wavelength layer 11 in the fast axis direction at a wavelength of 589nm (n 11)_y) Preferably less than 1.60, more preferably 1.59 or less.

(1/4 wavelength layer)

The 1/4 wavelength layer 12 has a function of converting linearly polarized light of a certain specific wavelength into circularly polarized light (or converting circularly polarized light into linearly polarized light) by giving a phase difference of pi/2 (λ/4) to the electric field vibration direction (polarization plane) of incident light.

The 1/4-wavelength layer 12 is a layer in which Re (λ), which is an in-plane retardation value at a specific wavelength λ nm, satisfies the condition that Re (λ) ═ λ/4, and can be achieved at any wavelength in the visible light region, but is preferably achieved at a wavelength of 550 nm. Re (550) as an in-plane retardation value at a wavelength of 550nm preferably satisfies 100 nm. ltoreq. Re (550). ltoreq.160 nm. Further, it is more preferable that 110 nm. ltoreq. Re (550). ltoreq.150 nm be satisfied.

1/4 average value of refractive index at wavelength 589nm of wavelength layer 12 (n 12)_x，y) Preferably less than 1.58, more preferably 1.57 or less.

(retardation developing layer formed of liquid Crystal layer)

A case where the retardation-exhibiting layer of the retardation layer is a liquid crystal layer will be described. The phase difference layer may be an 1/2 wavelength layer or a 1/4 wavelength layer. Fig. 2 is a schematic cross-sectional view schematically showing an example of a retardation layer including a retardation-developing layer as a liquid crystal layer and another layer. As shown in fig. 2, the retardation layer 30 is formed by sequentially laminating a base material layer 31, an alignment layer 32, and a retardation developing layer 33 as a liquid crystal layer. The retardation layer is not limited to the retardation layer 30 shown in fig. 2 as long as it includes the retardation-developing layer 33 as a liquid crystal layer, and may be a structure in which the base material layer 31 is peeled from the retardation layer 30 and only the alignment layer 32 and the retardation-developing layer 33 are formed, or a structure in which the base material layer 31 and the alignment layer 32 are peeled from the retardation layer 30 and only the retardation-developing layer 33 as a liquid crystal layer is formed. From the viewpoint of making the film thinner, the retardation layer is preferably formed by peeling the base material layer 31, and more preferably formed only by the retardation developing layer 33 as a liquid crystal layer. The base material layer 31 functions as a support layer for supporting the alignment layer 32 formed on the base material layer 31 and the retardation development layer 33 serving as a liquid crystal layer. The base material layer 31 is preferably a film formed of a resin material.

As the resin material, for example, a resin material excellent in transparency, mechanical strength, thermal stability, stretchability, and the like is used. Specific examples thereof include polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins such as norbornene polymers; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth) acrylic resins such as (meth) acrylic acid and polymethyl (meth) acrylate; cellulose ester resins such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; a polycarbonate-based resin; a polystyrene-based resin; a polyarylate-based resin; a polysulfone-based resin; a polyether sulfone-based resin; a polyamide resin; a polyimide-based resin; a polyether ketone resin; polyphenylene sulfide-based resin; polyphenylene ether resins, and mixtures and copolymers thereof. Among these resins, any of cyclic polyolefin resins, polyester resins, cellulose ester resins, and (meth) acrylic resins, or mixtures thereof are preferably used. The term "(meth) acrylic acid" as used herein means "at least 1 type of acrylic acid or methacrylic acid".

The base material layer 31 may be a single layer in which 1 or 2 or more kinds of the above resins are mixed, or may have a multilayer structure of 2 or more layers. In the case of having a multilayer structure, the resins forming the respective layers may be the same or different.

In the resin material forming the resin film, an optional additive may be added. Examples of the additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, coloring inhibitors, flame retardants, nucleating agents, antistatic agents, pigments, and colorants.

The thickness of the base material layer 31 is not particularly limited, but is preferably 5 to 200 μm, more preferably 10 to 200 μm, and still more preferably 10 to 150 μm in view of handling properties such as strength and handling properties.

In order to improve the adhesion between the base material layer 31 and the alignment layer 32, at least the surface of the base material layer 31 on the side where the alignment layer 32 is formed may be subjected to corona treatment, plasma treatment, flame treatment, or the like, or a primer layer or the like may be formed. When the base material layer 31 or the base material layer 31 and the alignment layer 32 are peeled to form the retardation layer, the peeling can be facilitated by adjusting the adhesion force at the peeling interface.

The alignment layer 32 has an alignment regulating force for aligning the liquid crystal compound contained in the phase difference developing layer 33 as a liquid crystal layer formed on the alignment layer 32 in a desired direction. Examples of the alignment layer 32 include an alignment polymer layer formed of an alignment polymer, a photo-alignment polymer layer formed of a photo-alignment polymer, and a groove alignment layer having a concave-convex pattern and a plurality of grooves (grooves) on the surface of the layer. The thickness of the alignment layer 32 is usually 0.01 to 10 μm, preferably 0.01 to 5 μm.

The composition having the alignment polymer dissolved in the solvent is applied to the base material layer 31, the solvent is removed, and rubbing treatment is performed as necessary, whereby an alignment polymer layer can be formed. In this case, the orientation regulating force can be arbitrarily adjusted in the orientation polymer layer formed of the orientation polymer by utilizing the surface state and the rubbing condition of the orientation polymer.

The photo-alignment polymer layer may be formed by applying a composition including a polymer or monomer having a photoreactive group and a solvent to the base material layer 31 and irradiating polarized light. In this case, the alignment regulating force can be arbitrarily adjusted in the photo-alignment polymer layer by using the polarized light irradiation condition of the photo-alignment polymer.

The groove alignment layer can be formed, for example, by a method of forming a concave-convex pattern by exposing and developing a surface of a photosensitive polyimide film through an exposure mask having a slit with a pattern shape; a method of forming an uncured layer of an active energy ray-curable resin on a plate-like master having grooves on the surface thereof, transferring the layer to the base material layer 31, and curing the layer; a method of forming an uncured layer of the active energy ray-curable resin on the base layer 31, pressing a roll-shaped master having irregularities against the layer, and curing the master after forming the irregularities.

The retardation-developing layer 33 of the liquid crystal layer imparts a predetermined retardation to light, and examples thereof include a retardation-developing layer for 1/2-wavelength layer and a retardation-developing layer for 1/4-wavelength layer.

The retardation developing layer 33 serving as a liquid crystal layer can be formed using a known liquid crystal compound. The type of the liquid crystal compound is not particularly limited, and a rod-like liquid crystal compound, a discotic liquid crystal compound, and a mixture thereof can be used. The liquid crystal compound may be a polymeric liquid crystal compound, a polymerizable liquid crystal compound, or a mixture thereof. Examples of the liquid crystal compound include those described in Japanese patent application laid-open Nos. 11-513019, 2005-289980, 2007-108732, 2010-244038, 2010-31223, 2010-270108, 2011-6360, 2011-207765, 2016-81035, 2017/043438 and 2011-207765.

For example, when a polymerizable liquid crystal compound is used, the retardation-developing layer 33 can be formed by applying a composition containing a polymerizable liquid crystal compound onto the alignment layer 32 to form a coating film and curing the coating film. The thickness of the phase difference-developing layer 33 is preferably 0.5 to 10 μm, more preferably 0.5 to 5 μm.

The composition containing a polymerizable liquid crystal compound may contain a polymerization initiator, a polymerizable monomer, a surfactant, a solvent, an adhesion improving agent, a plasticizer, an alignment agent, and the like in addition to the liquid crystal compound. As a method for applying the composition containing the polymerizable liquid crystal compound, a known method such as a die coating method can be mentioned. Examples of the method for curing the composition containing the polymerizable liquid crystal compound include known methods such as irradiation with active energy rays (e.g., ultraviolet rays).

(retardation layer having stretched film as retardation-developing layer)

The case where the retardation-exhibiting layer is a stretched film will be described. The stretched film is generally obtained by stretching a substrate. As a method of stretching the substrate, for example, a roll (wound body) around which the substrate is wound in a roll shape is prepared, the substrate is continuously wound from the wound body, and the wound substrate is conveyed to a heating furnace. The temperature set in the heating furnace is in the range of from the vicinity of the glass transition temperature of the substrate (. degree.C.) to [ glass transition temperature +100] (. degree.C.), preferably in the range of from the vicinity of the glass transition temperature (. degree.C.) to [ glass transition temperature +50] (. degree.C.). In this heating furnace, when the substrate is stretched in the traveling direction or in the direction orthogonal to the traveling direction, uniaxial or biaxial thermal stretching treatment is performed obliquely at an arbitrary angle by adjusting the conveyance direction and the tension. The stretching ratio is usually 1.1 to 6 times, preferably 1.1 to 3.5 times.

The method of stretching in the oblique direction is not particularly limited as long as the orientation axis can be continuously inclined at a desired angle, and a known stretching method can be employed. Examples of such a drawing method include the methods described in Japanese patent application laid-open Nos. 50-83482 and 2-113920. When a retardation is imparted to a film by stretching, the thickness after stretching is determined by the thickness before stretching and the stretching magnification.

The substrate is typically a transparent substrate. The transparent substrate is a substrate having transparency which can transmit light, particularly visible light, and the transparency is a characteristic that the transmittance to light having a wavelength of 380 to 780nm is 80% or more. Specific examples of the transparent substrate include a light-transmitting resin substrate. Examples of the resin constituting the light-transmitting resin substrate include polyolefins such as polyethylene and polypropylene; cyclic olefin resins such as norbornene polymers; polyvinyl alcohol; polyethylene terephthalate; polymethacrylates; a polyacrylate; cellulose esters such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; polyethylene naphthalate; a polycarbonate; polysulfones; polyether sulfone; a polyether ketone; polyphenylene sulfide and polyphenylene oxide. From the viewpoint of ease of acquisition and transparency, polyethylene terephthalate, polymethacrylate, cellulose ester, cycloolefin resin, or polycarbonate is preferable.

Cellulose ester is a substance in which a part or all of hydroxyl groups contained in cellulose are esterified, and is easily available from the market. In addition, cellulose ester substrates are also readily available from the market. Examples of commercially available cellulose ester substrates include "FUJITAC (registered trademark) Film" (fujifilm (strain)); "KC 8UX 2M", "KC 8 UY" and "KC 4 UY" (Konica Minolta Opto), etc.

Polymethacrylates and polyacrylates (hereinafter, polymethacrylates and polyacrylates are sometimes collectively referred to as (meth) acrylic resins) are readily available from the market.

Examples of the (meth) acrylic resin include homopolymers of alkyl methacrylate or alkyl acrylate, and copolymers of alkyl methacrylate and alkyl acrylate. Specific examples of the alkyl methacrylate include methyl methacrylate, ethyl methacrylate, and propyl methacrylate, and specific examples of the alkyl acrylate include methyl acrylate, ethyl acrylate, and propyl acrylate. As the (meth) acrylic resin, a resin sold as a general-purpose (meth) acrylic resin can be used. As the (meth) acrylic resin, a resin called an impact-resistant (meth) acrylic resin may also be used.

In order to further improve the mechanical strength, it is also preferable to contain rubber particles in the (meth) acrylic resin. The rubber particles are preferably acrylic rubber particles. The acrylic rubber particles are particles having rubber elasticity obtained by polymerizing an acrylic monomer containing an alkyl acrylate such as butyl acrylate or 2-ethylhexyl acrylate as a main component in the presence of a polyfunctional monomer. The acrylic rubber particles may be a single layer of such particles having rubber elasticity, or may be a multilayer structure having at least one rubber elastic layer. Examples of the acrylic rubber particles having a multilayer structure include: particles in which the rubber-elastic particles are used as cores and the peripheries of the rubber-elastic particles are covered with a hard alkyl methacrylate polymer; particles in which a hard alkyl methacrylate polymer is used as a core and the periphery thereof is covered with the above-mentioned acrylic polymer having rubber elasticity; and particles in which the periphery of the hard core is covered with a rubber-elastic acrylic polymer and the periphery is covered with a hard alkyl methacrylate polymer. The average diameter of the rubber particles formed of the elastic layer is usually in the range of about 50 to 400 nm.

The content of the rubber particles in the (meth) acrylic resin is usually about 5 to 50 parts by mass per 100 parts by mass of the (meth) acrylic resin. Since the (meth) acrylic resin and the acrylic rubber particles are sold in a mixed state, commercially available products thereof can be used. Examples of commercially available (meth) acrylic resins containing acrylic rubber particles include "HT 55X" and "テクノロイ S001" sold by sumitomo chemical corporation. "テクノロイ S001" is sold as a film.

The cycloolefin-based resin can be easily obtained from the market. Examples of commercially available cycloolefin resins include "Topas" (registered trademark) [ Ticona (d) ], "Arton" (registered trademark) [ JSR (strain) ], "ZEONOR" (registered trademark) [ japan ZEON (strain) ], "ZEONEX" (registered trademark) [ japan ZEON (strain) ], and "APEL" (registered trademark) [ mitsui chemical (strain) ]. The cycloolefin resin can be formed into a film by a known method such as a solvent casting method or a melt extrusion method to form a substrate. In addition, a commercially available cycloolefin resin base material may be used. Examples of commercially available cycloolefin resin substrates include "escina" (registered trademark) [ water chemical industry (ltd) ], "SCA 40" (registered trademark) [ water chemical industry (ltd) ], "ZEONOR Film" (registered trademark) [ OPTES (ltd) ], and "Arton Film" (registered trademark) [ JSR (ltd) ].

When the cyclic olefin resin is a copolymer of a cyclic olefin, a linear olefin, and an aromatic compound having a vinyl group, the content of the structural unit derived from the cyclic olefin is usually 50 mol% or less, and preferably in the range of 15 to 50 mol% based on the total structural units of the copolymer. Examples of the chain olefin include ethylene and propylene, and examples of the aromatic compound having a vinyl group include styrene, α -methylstyrene and alkyl-substituted styrene. When the cyclic olefin resin is a terpolymer of a cyclic olefin, a chain olefin and an aromatic compound having a vinyl group, the content of the structural unit derived from the chain olefin is usually 5 to 80 mol% based on the total structural units of the copolymer, and the content of the structural unit derived from the aromatic compound having a vinyl group is usually 5 to 80 mol% based on the total structural units of the copolymer. Such terpolymers have the advantage that less expensive cyclic olefins can be used in their manufacture.

< Linear polarizing plate >

The linearly polarizing plate 13 may be any film having a polarizing function of obtaining linearly polarized light from transmitted light. Examples of the film include a stretched film having a dye having absorption anisotropy adsorbed thereon, a film including a polarizing plate coated with a dye having absorption anisotropy, and the like. Examples of the dye having absorption anisotropy include dichroic dyes. Examples of the film coated with a dye having absorption anisotropy, which is used as a polarizing plate, include a stretched film in which a dye having absorption anisotropy is adsorbed, a film having a liquid crystal layer in which a composition containing a dichroic dye having liquid crystal properties or a composition containing a dichroic dye and a polymerizable liquid crystal is coated, and the like.

(Linear polarizing plate having a stretched film as a polarizer)

A linear polarizing plate including a polarizing plate made of a stretched film having a dye having absorption anisotropy adsorbed thereon will be described. A stretched film as a polarizing plate, to which a dye having absorption anisotropy is adsorbed, is generally produced through a step of uniaxially stretching a polyvinyl alcohol resin film, a step of adsorbing a dichroic dye by dyeing the polyvinyl alcohol resin film with the dichroic dye, a step of treating the polyvinyl alcohol resin film adsorbed with the dichroic dye with an aqueous boric acid solution, and a step of washing with water after the treatment with the aqueous boric acid solution. The polarizing plate may be used as it is, or a polarizing plate having a transparent protective film attached to at least one surface of the polarizing plate may be used as a linear polarizing plate.

The thickness of the polarizing plate obtained by uniaxially stretching the polyvinyl alcohol resin film, dyeing with a dichroic dye, treating with boric acid, washing with water, and drying in this manner is preferably 5 to 40 μm.

The material of the protective film to be attached to one or both surfaces of the polarizing plate is not particularly limited, and examples thereof include films known in the art, such as a cyclic polyolefin resin film, an acetate resin film containing a resin such as triacetyl cellulose or diacetyl cellulose, a polyester resin film containing a resin such as polyethylene terephthalate, polyethylene naphthalate or polybutylene terephthalate, a polycarbonate resin film, a (meth) acrylic resin film, and a polypropylene resin film. The thickness of the protective film is usually 300 μm or less, preferably 200 μm or less, more preferably 50 μm or less, and usually 5 μm or more, preferably 20 μm or more, from the viewpoint of thinning. The protective film on the viewing side may or may not have a retardation. On the other hand, the retardation with respect to the protective film on the side laminated on the side of the 1/2 wavelength layer 11 is preferably 10nm or less.

(Linear polarizing plate having a film having a liquid crystal layer as a polarizer)

A linear polarizing plate including a film having a liquid crystal layer as a polarizer will be described. Examples of the film coated with a dye having absorption anisotropy, which is used as a polarizing plate, include a film coated with a composition containing a dichroic dye having liquid crystallinity, a composition containing a dichroic dye and a liquid crystal compound, and the like. The film may be used alone as a linear polarizing plate, or may be used as a linear polarizing plate having a structure in which a protective film is provided on one surface or both surfaces thereof. The protective film may be the same as the above-described linear polarizing plate including a stretched film as a polarizing plate.

The film coated with the dye having absorption anisotropy is preferably thin, but if it is too thin, the strength tends to be lowered, and the processability tends to be poor. The thickness of the film is usually 20 μm or less, preferably 5 μm or less, and more preferably 0.5 μm or more and 3 μm or less.

Specific examples of the film coated with a dye having absorption anisotropy include films described in japanese patent laid-open No. 2012-33249 and the like.

The dye having absorption anisotropy may be applied directly to the 1/2 wavelength layer 11 to form a polarizing plate composite. In this case, the 2 nd adhesive layer 22 does not need to be provided.

< 2 nd adhesive layer >

The 2 nd adhesive layer 22 may be formed of, for example, an adhesive, a water-based adhesive, an active energy ray-curable adhesive, or a combination thereof. In this specification, the term "2 nd adhesive layer" includes not only an adhesive layer formed of an adhesive but also an adhesive layer formed of an adhesive.

The description of the 1 st adhesive layer 21 above applies to the active energy ray-curable adhesive for forming the 2 nd adhesive layer 22. When the 1 st adhesive layer 21 and the 2 nd adhesive layer 22 are formed of active energy ray-curable adhesives, the 1 st adhesive layer 21 and the 2 nd adhesive layer 22 may be formed of the same active energy ray-curable adhesive or different active energy ray-curable adhesives. The refractive index n22 at a wavelength of 589nm of the 2 nd adhesive layer 22 is preferably less than 1.55.

< other layer >

The polarizing plate composite may have layers other than those described above. For example, a retardation layer for optical compensation may be provided, or a 3 rd adhesive layer other than the 1 st adhesive layer 21 and the 2 nd adhesive layer 22 may be provided. The 3 rd adhesive layer is, for example, an adhesive layer provided on the surface of the 1/4 wavelength layer 12 opposite to the 1 st adhesive layer 21, and can be used for bonding the polarizing plate composite to the image display panel.

[ method for producing polarizing plate composite ]

Fig. 3(a) to (D) are schematic cross-sectional views schematically showing an example of the method for producing the polarizing plate composite of the present invention. The composite retardation plate 40 was obtained by laminating the 1/2 wavelength layer 11 including the 1 st retardation layer 113, the 1 st alignment layer 112, and the 1 st base material layer 111 shown in fig. 3(a) and the 1/4 wavelength layer 12 including the 2 nd retardation layer 123, the 2 nd alignment layer 122, and the 1 st base material layer 121 shown in fig. 3(B) via the 1 st adhesive layer 21. As shown in fig. 3(C), for example, the composite retardation plate 40 is a laminate in which a 1 st base material layer 111, a 1 st alignment layer 112, a 1 st retardation-exhibiting layer 113, a 1 st adhesive layer 21, a 2 nd retardation-exhibiting layer 123, a 2 nd alignment layer 122, and a 2 nd base material layer 121 are sequentially laminated. Then, as shown in fig. 3(D), a linear polarizing plate 13 was laminated on the 1/2 wavelength layer 11 side through the 2 nd adhesive layer 22 to obtain a polarizing plate composite 10.

The 1/2 wavelength layers 11 and 1/4 wavelength layers 12 may be disposed so that the phase difference-developing layers 113 and 123 are located inside or so that the phase difference-developing layers 113 and 123 are located outside, but preferably, as shown in fig. 3(C) and (D), the phase difference-developing layers 113 and 123 are located inside and are in contact with the 1 st adhesive layer 21.

As a method for bonding the 1/2 wavelength layer 11 and the 1/4 wavelength layer 12, there is a method in which an active energy ray-curable adhesive constituting the 1 st adhesive layer 21 is applied to either one or both of the bonding surface of the 1/2 wavelength layer 11 and the bonding surface of the 1/4 wavelength layer 12, the bonding surfaces of the other are laminated, and then the adhesive is cured by irradiation with active energy rays from the 1/2 wavelength layer 11 or the 1/4 wavelength layer 12 side. For the application of the adhesive constituting the 1 st adhesive layer 21, various application methods such as a doctor blade, a wire bar, a die coater, a comma type blade coater, and a gravure coater can be used.

Either or both of the bonding surface of the 1/2 wavelength layer 11 and the bonding surface of the 1/4 wavelength layer 12 may be subjected to corona treatment, plasma treatment, or the like, and a primer layer may be formed.

The composite retardation plate 40 may be a laminate as shown in fig. 3(C), or may be a laminate obtained by peeling at least one of the 1 st base material layer 111 and the 2 nd base material layer 121. Further, the laminate may be obtained by peeling the 1 st base material layer 111 and the 1 st alignment layer 112 from the laminate shown in fig. 3(C), or may be obtained by peeling the 2 nd base material layer 121 and the 2 nd alignment layer 122 from the laminate shown in fig. 3 (C). Specific examples are given in FIGS. 4(A) and (B).

Fig. 4(a) and (B) are schematic cross-sectional views schematically showing another example of the method for producing the polarizing plate composite from the composite retardation plate 40 shown in fig. 3 (C). As shown in fig. 4 a, the 1 st base material layer 111 and the 1 st alignment layer 112, and the 2 nd base material layer 121 and the 2 nd alignment layer 122 were peeled from the composite retardation plate 40 shown in fig. 3C to obtain a composite retardation plate 40', and then, as shown in fig. 4B, the linear polarizer 13 was laminated on the 1/2 wavelength layer 11 (the 1 st retardation developing layer 113) side via the 2 nd adhesive layer 22 to obtain the polarizer composite 10.

[ use of polarizing plate composite ]

A polarizing plate composite that is a circularly polarizing plate can be disposed on the visible side of an image display panel and used in various image display devices as an optical laminate to which antireflection performance is imparted. The image display device is a device having an image display panel, and includes a light emitting element or a light emitting device as a light emitting source. Examples of the image display device include a liquid crystal display device, an organic Electroluminescence (EL) display device, an inorganic Electroluminescence (EL) display device, a touch panel display device, an electron emission display device (for example, a field emission display device (FED), a surface field emission display device (SED)), electronic paper (a display device using electronic ink or an electrophoretic element), a plasma display device, a projection display device (for example, a Grating Light Valve (GLV) display device, a display device having a Digital Micromirror Device (DMD)), a piezoelectric ceramic display device, and the like. The liquid crystal display device includes any of a transmissive liquid crystal display device, a semi-transmissive liquid crystal display device, a reflective liquid crystal display device, a direct-view liquid crystal display device, a projection liquid crystal display device, and the like. These image display devices may be image display devices that display two-dimensional images or may be stereoscopic image display devices that display three-dimensional images. In particular, an optical laminate that is a circularly polarizing plate can be effectively used in an organic Electroluminescence (EL) display device that can include an image display panel having a bent portion.

Examples

The present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. Hereinafter, the amounts used, the parts of contents and% are based on mass unless otherwise specified.

[ adjustment of active energy ray-curable adhesive ]

The following components were mixed at the mixing ratios (unit is part by mass) shown in table 1, and then defoamed to prepare adhesives a to F. The cationic polymerization initiator (B) was added as a 50 mass% propylene carbonate solution, and the amount of solid components thereof is shown in table 1.

(epoxy compound)

A-1: 3, 4-epoxycyclohexanecarboxylic acid 3', 4' -epoxycyclohexylmethyl ester (trade name: CEL2021P, manufactured by Daicel Ltd.)

A-2: bisphenol F type epoxy resin (trade name: EXA-830CRP, manufactured by DIC corporation)

A-3: fluorene type epoxy resin (trade name: OGSOL EG-200, manufactured by Osaka Gas Chemicals Co., Ltd.)

A-4: DCPDM type epoxy resin (trade name: EP-4088S, manufactured by ADEKA, Inc.)

A-5: neopentyl glycol diglycidyl ether (trade name: EX-211L, manufactured by Nagase ChemteX Co., Ltd.)

A-6: biphenyl type epoxy resin (trade name: EX-142, manufactured by Nagase ChemteX)

A-7: 2-ethylhexyl glycidyl ether (trade name: EX-121, manufactured by Nagase ChemteX Co., Ltd.)

(initiator)

B: cationic polymerization initiator (trade name: CPI-100P, San-Apro, 50% by mass solution)

[ Table 1]

(method of measuring refractive index)

The adhesive prepared above was applied to one surface of a stretched norbornene-based resin Film (ZEONOR Film, manufactured by ZEON, Inc.) using a bar coater (manufactured by first physico-chemical Co., Ltd.), and the cumulative quantity of light was 600mJ/cm by an ultraviolet irradiation device (manufactured by Fusion UV Systems, Inc.)²(UV-B) irradiation with ultraviolet rays to obtain a cured product. The thickness of the cured product obtained was about 30 μm.

The norbornene resin film was peeled from the obtained cured product, and the refractive index of the cured product layer (589nm) was measured using a multi-wavelength Abbe refractometer ("DR-M2" manufactured by ATAGO Co., Ltd.) at 25 ℃. The results are shown in table 1.

[ production of polarizing plate ]

A polyvinyl alcohol film having an average polymerization degree of about 2400, a saponification degree of 99.9 mol% or more and a thickness of 75 μm was immersed in pure water at 30 ℃ and then immersed in an aqueous solution having a mass ratio of iodine/potassium iodide/water of 0.02/2/100 at 30 ℃ to carry out iodine dyeing (iodine dyeing step). The polyvinyl alcohol film subjected to the iodine dyeing step was immersed in an aqueous solution having a potassium iodide/boric acid/water mass ratio of 12/5/100 at 56.5 ℃ to be subjected to boric acid treatment (boric acid treatment step).

The polyvinyl alcohol film subjected to the boric acid treatment step was washed with pure water at 8 ℃ and then dried at 65 ℃ to obtain an oriented polarizing plate having iodine adsorbed to polyvinyl alcohol. In this case, stretching is performed in the iodine dyeing step and the boric acid treatment step. The total draw ratio in this drawing was 5.3 times, and the thickness of the obtained polarizing plate was 27 μm.

A saponified triacetyl cellulose film (trade name: KC4UYTAC, manufactured by Konica Minolta, 40 μm thick) was bonded to both sides of the obtained polarizing plate with a water-based adhesive by nip rolls. The obtained laminate was dried at 60 ℃ for 2 minutes while maintaining the tension of 430N/m, to obtain a polarizing plate having triacetyl cellulose films as protective films on both sides. The aqueous adhesive was prepared by adding 3 parts of carboxyl-modified polyvinyl alcohol (Kuraray Poval KL318, manufactured by Kuraray) and 1.5 parts of water-soluble polyamide epoxy Resin (Sumirez Resin 650, manufactured by sumtrex, an aqueous solution having a solid content concentration of 30%) to 100 parts of water.

[1/2 production of wavelength layer ]

The transparent resin substrate was coated with an alignment film coating liquid and dried to carry out a λ/2 alignment treatment. Then, a coating liquid containing a discotic liquid crystalline compound was applied to the alignment surface, and heating and UV irradiation were performed to fix the alignment of the liquid crystalline compound, thereby preparing an 1/2-wavelength layer having a retardation-developing layer with a thickness of 2 μm on a transparent resin substrate. Refractive index n11 in the fast axis direction at a wavelength of 589nm of the obtained 1/2 wavelength layer_y1.50, refractive index n11 in the slow axis direction_x1.62, refractive index n11 in the thickness direction_zIs 1.62. According to 3 refractive indexes n11_x、n11_y、n11_zCalculated three-dimensional average refractive index n11_x，y，zIs 1.58, according to 2 indices of refraction n11 in-plane_x、n11_yCalculated in-plane average refractive index n11_x，yIs 1.56.

[1/4 production of wavelength layer ]

The transparent resin substrate was coated with an alignment film coating liquid and dried to carry out a λ/4 alignment treatment. Then, the coating containing a rod-like and polymerized to the orientation faceThe coating liquid of the chiral nematic liquid crystal monomer was cured while maintaining the refractive index anisotropy, thereby producing an 1/4 wavelength layer having a retardation-exhibiting layer having a thickness of 1 μm on a transparent resin substrate. Refractive index n12 in the fast axis direction at a wavelength of 589nm of the obtained 1/4 wavelength layer_y1.49, refractive index n12 in the slow axis direction_x1.60, refractive index n12 in the thickness direction_zWas 1.49. According to 3 refractive indexes n12_x、n12_y、n12_zCalculated three-dimensional average refractive index n12_x，y，zIs 1.53, according to 2 refractive indices n12 in-plane_x、n12_yCalculated in-plane average refractive index n12_x，yIs 1.55.

< example 1 >

The obtained retardation-developing layer of the 1/4-wavelength layer and the retardation-developing layer of the 1/2-wavelength layer were subjected to corona treatment. Adhesive a in table 1 was applied to the phase difference-developing layer of the 1/4 wavelength layer subjected to the corona treatment, and 1/2 wavelength layers were stacked so that the phase difference-developing layer side of the 1/2 wavelength layer subjected to the corona treatment was opposed to each other and laminated by a laminator to obtain a laminate. At this time, the layers were bonded so that the angle formed by the slow axis of the 1/2 wavelength layer and the slow axis of the 1/4 wavelength layer was 60 °.

From the 1/4-wavelength layer of the laminate, an integrated light amount of 400mJ/cm was measured using an ultraviolet irradiation apparatus (manufactured by Fusion UV Systems Co., Ltd.)²(UV-B) ultraviolet rays were irradiated to cure the adhesive, thereby obtaining a composite retardation plate having a laminated structure of "1/4 wavelength layer"/1 st adhesive layer/"1/2 wavelength layer". The thickness of the 1 st adhesive layer was 1.5 μm.

The oriented film of the 1/2 wavelength layer and the transparent resin substrate of the composite retardation plate thus obtained were peeled off, and the retardation-developing layer of the polarizing plate and the 1/2 wavelength layer were bonded using an acrylic adhesive. The film thickness of the acrylic adhesive (film thickness of the 2 nd adhesive layer) was 5 μm, and the angle between the transmission axis of the polarizing plate and the fast axis of the 1/2 wavelength layer (referred to as "axis angle" in table 1) was 15 °.

Then, the orientation film and the transparent resin substrate on the 1/4 wavelength layer side were peeled off, and a polarizing plate composite having a laminated structure of polarizing plate/2 nd adhesive layer/"1/2 wavelength layer"/1 st adhesive layer/"1/4 wavelength layer" was obtained.

< example 2 >

A polarizing plate composite was produced in the same manner as in example 1, except that the adhesive B was used as the adhesive for forming the 1 st adhesive layer.

< example 3 >

A polarizing plate composite was produced in the same manner as in example 1, except that the adhesive C was used as the adhesive for forming the 1 st adhesive layer.

< example 4 >

A polarizing plate composite was produced in the same manner as in example 1, except that the adhesive D was used as the adhesive for forming the 1 st adhesive layer.

< comparative example 1 >

A polarizing plate composite was produced in the same manner as in example 1, except that the adhesive E was used as the adhesive for forming the 1 st adhesive layer.

< comparative example 2 >

A polarizing plate composite was produced in the same manner as in example 1, except that the adhesive F was used as the adhesive for forming the 1 st adhesive.

< comparative example 3 >

A polarizing plate composite was produced in the same manner as in example 1, except that the polarizing plates were bonded so that the angle formed by the transmission axis of the polarizing plate and the fast axis of the 1/2 wavelength layer (referred to as "axis angle" in table 1) was 105 °.

[ evaluation method ]

(method of evaluating interference unevenness)

The polarizing plate composites of examples and comparative examples were adhered to an aluminum reflection plate via an acrylic adhesive (film thickness 25 μm), visually observed under a three primary color fluorescent lamp, and evaluated based on the following criteria.

The evaluation results are shown in table 2.

A: no interference unevenness was observed

B: slight observation of interference unevenness

C: uneven interference is observed

[ Table 2]

Description of the reference numerals

A 10-polarizer composite, an 111/2-wavelength layer, a 121/4-wavelength layer, a 13-linear polarizer, a 21 st 1-adhesion layer, a 22 nd 2-adhesion layer, a 30-phase difference plate, a 31 base material layer, a 32-orientation layer, a 33-phase difference developing layer, a 40-composite phase difference plate, a 111 st 1-base material layer, a 112 th 1-orientation layer, a 113 st 1-phase difference developing layer, a 121 nd 2-base material layer, a 122 nd 2-orientation layer, and a 123 nd 2-phase difference developing layer.

Claims (11)

1. A composite of a polarizing plate having a first surface and a second surface,

which comprises a linear polarizing plate, an 1/2 wavelength layer, a 1 st adhesive layer obtained by curing an active energy ray-curable adhesive, and a 1/4 wavelength layer in this order,

the angle formed by the fast axis of the 1/2 wavelength layer and the transmission axis of the linearly polarizing plate is 10 DEG to 20 DEG,

the absolute value of the difference between the refractive index at the wavelength of 589nm of the 1 st adhesive layer and the refractive index in the fast axis direction at the wavelength of 589nm of the 1/2 th wavelength layer is less than 0.05.

2. The polarizing plate composite of claim 1,

the refractive index of the 1 st adhesive layer at the wavelength of 589nm is less than 1.55.

3. The polarizing plate composite of claim 1 or 2,

the 1/4 wavelength layer has an in-plane average refractive index of less than 1.58 at a wavelength of 589nm, which is the average of the refractive index in the fast axis direction and the refractive index in the slow axis direction.

4. The polarizing plate composite according to any one of claims 1 to 3,

an absolute value of a difference between a refractive index at a wavelength of 589nm of the 1 st adhesive layer and an in-plane average refractive index at a wavelength of 589nm of the 1/4 th wavelength layer is less than 0.05, the in-plane average refractive index being an average of a refractive index in a fast axis direction and a refractive index in a slow axis direction.

5. The polarizing plate composite according to any one of claims 1 to 4, which is a circular polarizing plate.

6. The polarizing plate composite according to any one of claims 1 to 5,

the 1/2 wavelength layer includes a phase difference developing layer as a liquid crystal layer.

7. The polarizing plate composite according to any one of claims 1 to 6,

the 1/4 wavelength layer includes a phase difference developing layer as a liquid crystal layer.

8. The polarizing plate composite according to any one of claims 1 to 7,

the thickness of the 1 st adhesive layer is 5 μm or less.

9. An image display device, comprising:

image display panel, and

the polarizing plate composite according to any one of claims 1 to 8 disposed on the visible side of the image display panel.

10. The image display apparatus according to claim 9,

the polarizing plate composite is disposed in a direction in which the linear polarizing plate is positioned on the viewing side.

11. The image display device according to claim 9 or 10, which is an organic electroluminescent display device.

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