Stacked body and image display device

Abstract

To provide a laminate and an image display device using the same, which has a support, an orientation layer, and a light-absorbing anisotropic layer, and in which the support is easily peeled off alone. The laminate of the present application has, in order, a support, an orientation layer, a light-absorbing anisotropic layer, and an adhesive layer, and the thickness from the support to the adhesive layer excluding the support and the adhesive layer is 5 μm or less, and the thickness of the adhesive layer is 5 μm to 50 μm.

Description

[0001] This application is a divisional application of the patent application with application number 201980068012.9, filed on October 15, 2019, and with the title “Laminate and image display device”. TECHNICAL FIELD

[0002] The present application relates to a laminate and an image display device. BACKGROUND

[0003] In recent years, various studies have been made on light absorption anisotropic layers formed using dichroic substances.

[0004] For example, Patent Literature 1 discloses “a circular polarizing plate, which is formed by sequentially stacking a liquid crystal cured film, an adhesive layer, a phase difference film, and an adhesive layer, wherein the liquid crystal cured film is a film having a thickness of 3 μm or less, which is formed by curing a polymerizable liquid crystal compound in a state of being oriented in a horizontal direction with respect to a substrate surface, and is a film containing a dichroic dye.” ([Claim 16]).

[0005] On the other hand, in accordance with a further demand for thinness of display devices in recent years, a method of peeling off a support for the above-mentioned circular polarizing plate or the like to make it thinner has been proposed.

[0006] Further, in Patent Literature 1, a problem is to provide an optical anisotropic sheet that imparts a thin optical anisotropic film (

[0004] ).

[0007] Prior Art Documents

[0008] Patent Literature

[0009] Patent Literature 1: Japanese Patent Application Publication No. 2016-027431 SUMMARY

[0010] Technical Problem to be Solved by the Invention

[0011] However, when the layer structure becomes complex due to expression of various functions, it is difficult to control which interface is peeled off at the time of transfer.

[0012] Especially in the case where each layer is a very thin laminate due to thinning of a polarizer or the like, or the like, it is found that the control of the peeling interface becomes more difficult. For example, even if an attempt is made to peel off only the support from a laminate having a support, an orientation layer, and a light absorption anisotropic layer, peeling at the interface of the orientation layer and the light absorption anisotropic layer sometimes occurs.

[0013] Therefore, an object of the present application is to provide a laminate having a support, an orientation layer, and a light absorption anisotropic layer, in which only the support is easily peeled off, and an image display device using the same.

[0014] Means for solving technical problems

[0015] As a result of intensive studies conducted by the present inventors and others in order to solve the above problems, it was found that the peelability at other interfaces varies depending on the properties of the adhesive layer at the time of adhesion to other components.

[0016] That is, it was found that a laminate can be provided which has a support, an orientation layer, a light-absorbing anisotropic layer, and an adhesive layer in this order, and the thickness from the support to the adhesive layer excluding the support and the adhesive layer is 5 μm or less, wherein by setting the thickness of the adhesive layer to a specific value, peeling off only the support becomes easy.

[0017] That is, it was found that the above problems can be solved by the following structure.

[0018] [1] A laminate which has a support, an orientation layer, a light-absorbing anisotropic layer, and an adhesive layer in this order, wherein,

[0019] the thickness from the support to the adhesive layer excluding the support and the adhesive layer is 5 μm or less,

[0020] the thickness of the adhesive layer is 5 μm to 50 μm,

[0021] the orientation layer is a photo-alignment layer formed using an orientation layer-forming composition containing a cinnamyl compound having a functional group having an ethylenic unsaturated double bond.

[0022] [2] The laminate according to [1], wherein,

[0023] the storage modulus of the adhesive layer is 100 kPa to 20 MPa.

[0024] [3] The laminate according to [2], wherein,

[0025] the storage modulus of the adhesive layer is 100 kPa to 2 MPa.

[0026] [4] The laminate according to any one of [1] to [3], wherein,

[0027] the thickness of the adhesive layer is greater than 10 μm and 50 μm or less.

[0028] [5] The laminate according to any one of [1] to [4], wherein,

[0029] the light-absorbing anisotropic layer contains a dichroic substance and a liquid-crystalline compound.

[0030] [6] The laminate according to any one of [1] to [5], wherein,

[0031] The light-absorbing anisotropic layer contains a dichroic azo compound.

[0032] [7] The laminate according to any one of [1] to [6], wherein

[0033] The thickness of the light-absorbing anisotropic layer is 0.1 μm to 3 μm.

[0034] [8] The laminate according to any one of [1] to [7], wherein

[0035] The thickness of the orientation layer is 0.1 μm to 2 μm.

[0036] [9] The laminate according to [8], wherein

[0037] The thickness of the orientation layer is more than 0.5 μm and 2 μm or less.

[0038]

[10] The laminate according to any one of [1] to [9], wherein

[0039] The cinnamoyl compound is a photoalignment copolymer having a repeating unit A containing a photoalignment group represented by the following formula (A) and a repeating unit B containing a crosslinkable group represented by the following formula (B).

[0040]

[11] The laminate according to

[10] , wherein

[0041] L in the following formula (A) 1 is a divalent linking group represented by any one of the following formulas (1) to (10).

[0042]

[12] The laminate according to [5], wherein

[0043] The liquid crystalline compound is a polymerizable liquid crystalline compound.

[0044]

[13] The laminate according to [5], wherein

[0045] The liquid crystalline compound is a high-molecular liquid crystalline compound.

[0046]

[14] The laminate according to

[13] , wherein

[0047] The light-absorbing anisotropic layer further contains a low-molecular liquid crystalline compound.

[0048]

[15] The laminate according to any one of [1] to

[14] , further having a cured layer having a thickness of 100 nm or less between the light-absorbing anisotropic layer and the adhesive layer.

[0049]

[16] The laminate according to

[15] , wherein

[0050] The cured layer contains a liquid crystalline compound.

[0051]

[17] The laminate according to

[15] , wherein

[0052] The cured layer is a layer obtained by curing a composition containing a multifunctional monomer.

[0053]

[18] The laminate according to any one of [1] to

[17] , further having a layer containing a polyvinyl alcohol resin having a thickness of 2 μm or less between the light-absorbing anisotropic layer and the adhesive layer.

[0054]

[19] The laminate according to any one of [1] to

[18] , wherein

[0055] The support is in contact with the orientation layer.

[0056]

[20] The laminate according to any one of [1] to

[19] , wherein

[0057] The orientation layer is in contact with the light-absorbing anisotropic layer.

[0058]

[21] A laminate having the laminate according to any one of [1] to

[20] and a surface film, and the adhesive layer is in contact with the surface film.

[0059]

[22] The laminate according to

[21] , wherein

[0060] The support has been peeled off.

[0061]

[23] The laminate according to

[22] , further having a phase difference film, and the phase difference film is disposed on the orientation layer side.

[0062]

[24] An image display device having the laminate according to any one of [1] to

[23] and an image display element.

[0063] Effects of Invention

[0064] According to the present application, it is possible to provide a laminate having a support, an orientation layer and a light-absorbing anisotropic layer, wherein only the support is easily peeled off, and an image display device using the same. BRIEF DESCRIPTION OF DRAWINGS

[0065] Figure 1 is a schematic cross-sectional view showing an example of an embodiment of the laminate of the present application.

[0066] Figure 2 is a schematic cross-sectional view showing an example of an embodiment of the laminate of the present application.

[0067] Figure 3is a schematic cross-sectional view showing an example of an embodiment of the laminate of the present application. DETAILED DESCRIPTION

[0068] Hereinafter, the present application will be described in detail.

[0069] The following description of the components is made according to a representative embodiment of the present application, but the present application is not limited to this embodiment.

[0070] In addition, in the present specification, a numerical range indicated by "to" means a range including the numerical values recited before and after "to" as lower limit values and upper limit values.

[0071] Also, in the present specification, parallel, orthogonal do not mean strict parallel, orthogonal, but mean within a range of ±5° from parallel or orthogonal.

[0072] Also, in the present specification, each component can use one kind of a substance corresponding to each component alone, or two or more kinds of substances can be used at the same time. Here, regarding each component, when two or more kinds of substances are used at the same time, unless otherwise specified, the content regarding the component means the total content of the substances used at the same time.

[0073] Also, in the present specification, "(meth)acrylate" is a notation indicating "acrylate" or "methacrylate", "(meth)acrylic acid" is a notation indicating "acrylic acid" or "methacrylic acid", and "(meth)acryloyl" is a notation indicating "acryloyl" or "methacryloyl".

[0074] Also, in the present specification, the liquid crystalline composition, the liquid crystalline compound also conceptually include a liquid crystalline composition, a liquid crystalline compound that has already lost liquid crystallinity by curing or the like.

[0075] [LAMINATE]

[0076] The laminate of the present application is a laminate sequentially having a support, an orientation layer, a light-absorbing anisotropic layer, and an adhesive layer.

[0077] Also, in the laminate of the present application, the thickness from the support to the adhesive layer excluding the support and the adhesive layer is 5 μm or less, and the thickness of the adhesive layer is 5 μm to 50 μm.

[0078] Further, in the laminate of the present application, the orientation layer is a photo-alignment layer formed using an orientation layer-forming composition containing a cinnamyl compound having a functional group having an ethylenic unsaturated double bond.

[0079] Next, the use of the laminate of the present application will be described. Figures 1-3 After the overall structure of the laminate of the present application is described, each structure will be described in detail.

[0080] Figure 1 The illustrated laminate 10 has, in order, a support 1, an orientation layer 2, a light-absorbing anisotropic layer 3, and an adhesive layer 4.

[0081] Also, in the laminate 10, the thickness from the support 1 to the adhesive layer 4, that is, the distance from the surface of the orientation layer 2 side of the support 1 to the surface of the light-absorbing anisotropic layer 3 side of the adhesive layer 4, is 5 μm or less, preferably 1 μm to 4 μm, excluding the support 1 and the adhesive layer 4.

[0082] Also, in the laminate 10, the thickness of the adhesive layer 4 is 5 μm to 50 μm.

[0083] As illustrated in Figure 1 , in the laminate of the present application, it is preferable that the support 1 be in contact with the orientation layer 2.

[0084] Also, as illustrated in Figure 1 , in the laminate of the present application, it is preferable that the orientation layer 2 be in contact with the light-absorbing anisotropic layer 3.

[0085] As illustrated in Figure 2 , in the laminate of the present application, it is preferable that the laminate further have a cured layer 5 having a thickness of 100 nm or less between the light-absorbing anisotropic layer 3 and the adhesive layer 4.

[0086] As illustrated in Figure 2 , in the laminate of the present application, it is preferable that the laminate further have a layer 6 containing a polyvinyl alcohol resin having a thickness of 2 μm or less between the light-absorbing anisotropic layer 3 and the adhesive layer 4 (hereinafter, also referred to simply as "PVA layer").

[0087] When the laminate of the present application simultaneously includes the cured layer 5 and the layer 6 containing a polyvinyl alcohol resin, as illustrated in Figure 2 , it is preferable that the laminate have, in order, the light-absorbing anisotropic layer 3, the cured layer 5, the layer 6 containing a polyvinyl alcohol resin, and the adhesive layer 4.

[0088] As illustrated in Figure 3 , in the laminate of the present application, it is preferable that the laminate further have a surface film 7. At this time, it is preferable that the surface film 7 be in contact with the adhesive layer 4, that is, the surface film 7 be attached to the other layers via the adhesive layer 4.

[0089] The laminate of the present application can be peeled off Figure 2 from the support 1, and as illustrated in Figure 3 , used in a state without the support 1.

[0090] Also, as illustrated in Figure 3 , the laminate of the present application can further have a phase difference film 8, and at this time, the phase difference film 8 is preferably disposed on the orientation layer 2 side.

[0091] 〔Adhesive Layer〕

[0092] As for the adhesive layer used in the present application, there is no particular limitation as long as the thickness is 5 μm to 50 μm, and various publicly known raw materials can be used.

[0093] From the viewpoint of more easily adjusting the peelability of the support, the storage modulus of the adhesive layer used in the present application is preferably 10 kPa to 20 MPa, more preferably 10 kPa to 2 MPa.

[0094] "Method for measuring storage modulus"

[0095] In the present application, the storage modulus refers to a value measured using a dynamic viscoelasticity measuring device (DVA-200) manufactured by IT Keisoku Seigyo Co., Ltd. at a frequency of 1 Hz and 25°C.

[0096] The thickness of the adhesive layer used in the present application is 5 μm to 50 μm, preferably more than 10 μm and 50 μm or less.

[0097] By being in the above range, the peelability is more easily adjusted.

[0098] <Raw materials for adhesive layer>

[0099] As the raw material contained in the adhesive layer used in the present application, for example, rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, urethane-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl alcohol-based adhesives, polyvinyl pyrrolidone-based adhesives, polyacrylamide-based adhesives, and cellulose-based adhesives, etc. can be given.

[0100] Among these, from the viewpoints of transparency, weather resistance, heat resistance, etc., an acrylic-based adhesive (pressure-sensitive adhesive) is preferred.

[0101] As the acrylic-based adhesive, an acrylic polymer such as a copolymer of a (meth)acrylate ester in which the alkyl group of the ester moiety is an alkyl group having 20 or less carbon atoms such as a methyl group, an ethyl group, or a butyl group, and a (meth)acrylic acid and a (meth)acrylic acid hydroxyethyl ester, etc. having a functional group, is preferred.

[0102] Such an adhesive containing an acrylic polymer has excellent adhesion, and when it is peeled after being attached to other members, no slurry residue, etc. is generated on the display device, and it can be peeled relatively easily, and thus is preferred.

[0103] Furthermore, the glass transition temperature of such an acrylic polymer is preferably 25°C or less, more preferably 0°C or less.

[0104] Furthermore, the weight average molecular weight of such an acrylic polymer is preferably 100,000 or more.

[0105] 〔Supporting body〕

[0106] The supporting body used in the present application is not particularly limited, and various publicly known supporting bodies can be used. As the supporting body, a peelable supporting body is preferred.

[0107] As the material constituting the supporting body used in the present application, for example, cellulose-based resins, acrylic-based resins, methacrylic-based resins, polycarbonate-based resins, polystyrene-based resins, polyolefin-based resins, cyclic polyolefin-based resins, glutaric anhydride-based resins, glutarimide-based resins, cellulose-based resins, polyester-based resins, and mixed resins of a plurality of resins selected from these can be listed, of which cellulose-based resins or polyester-based resins are preferred.

[0108] From the viewpoint of more easily adjusting the peelability, the thickness of the supporting body is preferably 10 to 200 μm, further preferably 50 to 200 μm, and more preferably 100 to 200 μm.

[0109] Further, by adjusting the modulus of elasticity of the supporting body according to the storage modulus of the adhesive layer, the peelability can be more easily adjusted.

[0110] Further, by selecting a supporting body that is difficult to permeate according to the composition of the orientation layer to reduce the adhesion of the supporting body / orientation layer, the peelability can be more easily adjusted.

[0111] 〔Orientation layer〕

[0112] The orientation layer used in the present application is a photo-alignment layer formed using an orientation layer-forming composition containing a cinnamyl compound having a functional group having an ethylenically unsaturated double bond.

[0113] The thickness of the orientation layer used in the present application is preferably 0.1 μm to 2 μm, and more preferably greater than 0.5 μm and 2 μm or less.

[0114] As described above, the photo-alignment layer used in the present application is a photo-alignment layer formed using an orientation layer-forming composition containing a cinnamyl compound having a functional group (hereinafter, referred to as a "polymerizable group" in this paragraph.) having an ethylenically unsaturated double bond, of which a photo-alignment layer formed using a photo-alignment copolymer described later is more preferred as the cinnamyl compound. By also including a polymerizable group (for example, a methacryl group or an acryl group) of the same kind as the group contained in the composition of the light-absorbing anisotropic layer in the composition of the photo-alignment layer, the layers are chemically bonded to each other to increase the interlayer adhesion of the photo-alignment layer / light-absorbing anisotropic layer, thereby favorably achieving the object of the present application, that is, the layered body from which only the supporting body is easily peeled.

[0115] <Photo-alignment copolymer>

[0116] The photoalignment copolymer used in the present application is a photoalignment copolymer having a repeating unit A containing a photoalignment group represented by the following formula (A) and a repeating unit B containing a crosslinkable group represented by the following formula (B).

[0117] [Chemical Formula 1]

[0118]

[0119] In the above formula (A), R 1 represents a hydrogen atom or a methyl group. L 1 represents a divalent linking group containing a nitrogen atom and a cycloalkane ring, and a part of carbon atoms constituting the cycloalkane ring can be substituted with a heteroatom selected from the group consisting of nitrogen, oxygen and sulfur. R 2 , R 3 , R 4 , R 5 and R 6 each independently represent a hydrogen atom or a substituent, R 2 , R 3 , R 4 , R 5 and R 6 , of which two adjacent groups can be bonded to form a ring,

[0120] In the above formula (B), R 7 represents a hydrogen atom or a methyl group, L 2 represents a divalent linking group, and X represents a crosslinkable group represented by the following formula (X4).

[0121] [Chemical Formula 2]

[0122]

[0123] In the above formula (X4), * represents a bonding position with L 2 in the above formula (B), and S represents a functional group having an ethylenically unsaturated double bond.

[0124] In the present application, by using a photoalignment copolymer having a repeating unit A containing a photoalignment group represented by the above formula (A) and a repeating unit B containing a crosslinkable group represented by the above formula (B), the solvent resistance and liquid crystal alignment property of the obtained photoalignment film become good.

[0125] Although the details are not clear, the present inventors et al. have speculated as follows.

[0126] That is, it is considered that since L 1The divalent linking group represented contains a nitrogen atom and a cycloalkane ring, and the hydrogen bonding and molecular rigidity are improved, whereby the molecular motion is inhibited, and as a result, the solvent resistance is improved.

[0127] Likewise, it is considered that, because L 1 The divalent linking group represented contains a nitrogen atom and a cycloalkane ring, and the glass transition temperature of the copolymer is increased, whereby the temporal stability of the photo-alignment film obtained is improved, and as a result, the liquid crystal alignment properties become good regardless of the timing of forming the optically anisotropic layer.

[0128] Next, L 1 The divalent linking group represented containing a nitrogen atom and a cycloalkane ring is described. In addition, in the present application, as described above, a part of the carbon atoms constituting the cycloalkane ring can be substituted with a heteroatom selected from the group including nitrogen, oxygen, and sulfur. Also, when a part of the carbon atoms constituting the cycloalkane ring has been substituted with a nitrogen atom, it can not have a nitrogen atom independent of the cycloalkane ring.

[0129] Also, L 1 The cycloalkane ring contained in the divalent linking group represented in the above formula (A) is preferably a cycloalkane ring having 6 or more carbon atoms, and as specific examples thereof, a cyclohexane ring, a cycloheptane ring, a cyclooctane ring, a cyclododecane ring, a cyclodocosane ring, and the like can be given.

[0130] In the present application, for the reason that the liquid crystal alignment properties become better, L 1 is a divalent linking group represented by any one of the following formulas (1) to (10).

[0131] [Chemical Formula 3]

[0132]

[0133] In the above formulas (1) to (10), *1 indicates the bonding position to the carbon atom constituting the main chain in the above formula (A), and *2 indicates the bonding position to the carbon atom constituting the carbonyl group in the above formula (A).

[0134] Among the divalent linking groups represented by any one of the above formulas (1) to (10), for the reason that the balance between the solubility to the solvent used when forming the photo-alignment film and the solvent resistance of the photo-alignment film obtained becomes good, it is preferable that the divalent linking group represented by any one of the above formulas (2), (3), (7), and (8).

[0135] In addition, L 1 may be a divalent linking group other than the above "divalent linking group containing a nitrogen atom and a cycloalkane ring".

[0136] As such a divalent linking group, for the reason that the photo-orienting group easily interacts with the liquid crystalline compound and the liquid crystal orienting property of the adjacent liquid crystal layer becomes better, a divalent linking group composed of at least two or more groups selected from the group consisting of a linear, branched or cyclic alkylene group having 1 to 18 carbon atoms which can have a substituent, an arylene group having 6 to 12 carbon atoms which can have a substituent, an ether group (-0-), a carbonyl group (-C(=0)-) and an imino group (-NH-) which can have a substituent is preferable.

[0137] Next, the substituents represented by one mode of R 2 , R 3 , R 4 , R 5 and R 6 in the above formula (A) are described. In addition, as described above, R 2 , R 3 , R 4 , R 5 and R 6 in the above formula (A) can be a hydrogen atom, not a substituent.

[0138] For the reason that the photo-orienting group easily interacts with the liquid crystalline compound and the liquid crystal orienting property becomes better, the substituents represented by one mode of R 2 , R 3 , R 4 , R 5 and R 6 in the above formula (A) are preferably independently a halogen atom, a linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, a linear halogenated alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, a cyano group, an amino group or a group represented by the following formula (11).

[0139] [Chemical Formula 4]

[0140]

[0141] In the above formula (11), * indicates the bonding position to the phenyl ring in the above formula (A), and R 9 represents a monovalent organic group.

[0142] As the halogen atom, for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom and the like can be given, of which a fluorine atom and a chlorine atom are preferable.

[0143] As the linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, as the linear alkyl group, an alkyl group having 1 to 6 carbon atoms is preferable, and specifically, for example, a methyl group, an ethyl group, a n-propyl group, and the like can be given.

[0144] As the branched alkyl group, an alkyl group having 3 to 6 carbon atoms is preferable, and specifically, for example, an isopropyl group, a t-butyl group, and the like can be given.

[0145] As the cyclic alkyl group, an alkyl group having 3 to 6 carbon atoms is preferable, and specifically, for example, a cyclopropyl group, a cyclopentyl group, a cyclohexyl group, and the like can be given.

[0146] As the linear halogenated alkyl group having 1 to 20 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms is preferable, and specifically, for example, a trifluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, a perfluorobutyl group, and the like can be given, of which a trifluoromethyl group is preferable.

[0147] As the alkoxy group having 1 to 20 carbon atoms, an alkoxy group having 1 to 18 carbon atoms is preferable, an alkoxy group having 6 to 18 carbon atoms is more preferable, and an alkoxy group having 6 to 14 carbon atoms is further preferable. Specifically, for example, a methoxy group, an ethoxy group, a n-butoxy group, a methoxyethoxy group, a n-hexyloxy group, a n-octyloxy group, a n-decyloxy group, a n-dodecyloxy group, a n-tetradecyloxy group, and the like can be given, of which a n-hexyloxy group, a n-octyloxy group, a n-decyloxy group, a n-dodecyloxy group, a n-tetradecyloxy group are more preferable.

[0148] As the aryl group having 6 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms is preferable, and specifically, for example, a phenyl group, an α-methylphenyl group, a naphthyl group, and the like can be given, of which a phenyl group is preferable.

[0149] As the aryloxy group having 6 to 20 carbon atoms, an aryloxy group having 6 to 12 carbon atoms is preferable, and specifically, for example, a phenoxy group, a 2-naphthoxy group, and the like can be given, of which a phenoxy group is preferable.

[0150] As the amino group, for example, a primary amino group (-NH2); a secondary amino group such as a methylamino group; a tertiary amino group such as a dimethylamino group, a diethylamino group, a dibenzylamino group, a group in which a nitrogen atom of a nitrogen-containing heterocyclic compound (for example, pyrrolidine, piperidine, piperazine, and the like) is used as a linking bond; and the like can be given.

[0151] As the group represented by the above formula (11), as the monovalent organic group represented by R 9

[0152] As the linear alkyl group, an alkyl group having 1 to 6 carbon atoms is preferable, and specifically, for example, a methyl group, an ethyl group, a n-propyl group, and the like can be given, of which a methyl group or an ethyl group is preferable.

[0153] ​As the cyclic alkyl group, an alkyl group having 3 to 6 carbon atoms is preferable, and specifically, for example, cyclopropyl, cyclopentyl, cyclohexyl and the like can be given, of which cyclohexyl is preferable.

[0154] Further, as R 9 represented by the above formula (11) can be a group in which a plurality of the above linear alkyl groups and cyclic alkyl groups are combined directly or through a single bond.

[0155] In the present application, for the reason that the photo-orienting group easily interacts with the liquid crystalline compound and the liquid crystal alignment property becomes more excellent, R 2 , R 3 , R 4 , R 5 and R 6 in the above formula (A) are preferably at least R 4 represents the above substituent, and further, for the reason that the linearity of the obtained photo-orienting copolymer is improved and the liquid crystal alignment property is further made excellent by easily interacting with the liquid crystalline compound, it is more preferable that R 2 , R 3 , R 5 and R 6 all represent a hydrogen atom.

[0156] In the present application, for the reason that the reaction efficiency is improved when light is irradiated to the obtained photo-orienting film, it is preferable that R 4 in the above formula (A) is an electron-donating substituent.

[0157] Here, the electron-donating substituent (electron-donating group) refers to a substituent having a Hammett substituent constant σp of 0 or less, and for example, the above substituents such as alkyl groups, haloalkyl groups, alkoxy groups and the like can be given.

[0158] Of these, an alkoxy group is preferable, and for the reason that the liquid crystal alignment property becomes more excellent, an alkoxy group having 6 to 16 carbon atoms is more preferable, and an alkoxy group having 7 to 10 carbon atoms is further preferable.

[0159] Next, the divalent linking group represented by L 2 in the above formula (B) will be described.

[0160] For the reason that the photo-orienting group easily interacts with the liquid crystalline compound and the liquid crystal alignment becomes better, as the divalent linking group, a divalent linking group in which two or more groups selected from the group consisting of a linear, branched or cyclic alkylene group having 1 to 18 carbon atoms which can have a substituent, an arylene group having 6 to 12 carbon atoms which can have a substituent, an ether group (-0-), a carbonyl group (-C(=0)-) and an imino group (-NH-) which can have a substituent are combined is preferable.

[0161] Here, as the substituents which the alkylene group, arylene group and imino group can have, for example, a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a cyano group, a carboxyl group, an alkoxycarbonyl group and a hydroxyl group, etc. can be mentioned.

[0162] As the halogen atom, for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, etc. can be mentioned, of which a fluorine atom and a chlorine atom are preferable.

[0163] As the alkyl group, for example, a linear, branched or cyclic alkyl group having 1 to 18 carbon atoms is preferable, a linear, branched or cyclic alkyl group having 1 to 8 carbon atoms is more preferable (for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, a n-butyl group, an isobutyl group, a sec-butyl group, a t-butyl group, a cyclohexyl group, etc.), a linear, branched or cyclic alkyl group having 1 to 4 carbon atoms is further preferable, and a methyl group or an ethyl group is particularly preferable.

[0164] As the alkoxy group, for example, an alkoxy group having 1 to 18 carbon atoms is preferable, an alkoxy group having 1 to 8 carbon atoms is more preferable (for example, a methoxy group, an ethoxy group, a n-butoxy group, a methoxyethoxy group, etc.), an alkoxy group having 1 to 4 carbon atoms is further preferable, and a methoxy group or an ethoxy group is particularly preferable.

[0165] As the aryl group, for example, an aryl group having 6 to 12 carbon atoms can be mentioned, specifically, for example, a phenyl group, an α-methylphenyl group, a naphthyl group, etc. can be mentioned, of which a phenyl group is preferable.

[0166] As the aryloxy group, for example, a phenoxy group, a naphthoxy group, an imidazolyl-oxy group, a benzimidazolyl-oxy group, a pyridin-4-yloxy group, a pyrimidinyl-oxy group, a quinazolinyl-oxy group, a purinyl-oxy group, a thien-3-yl-oxy group, etc. can be mentioned.

[0167] As the alkoxycarbonyl group, for example, a methoxycarbonyl group, an ethoxycarbonyl group, etc. can be mentioned.

[0168] As the linear, branched or cyclic alkylene group having 1 to 18 carbon atoms, as the linear alkylene group, specifically, for example, a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a decylene group, an undecenylene group, a dodecenylene group, a tridecenylene group, a tetradecenylene group, a pentadecenylene group, a hexadecenylene group, a heptadecenylene group, an octadecenylene group, etc. can be mentioned.

[0169] Further, as the branched alkylene group, specifically, for example, dimethylmethylene, methylethylene, 2,2-dimethylpropylene, 2-ethyl-2-methylpropylene, and the like can be given.

[0170] Further, as the cyclic alkylene group, specifically, for example, cyclopropylene, cyclobutylene, cyclopentylene, cyclohexylene, cyclooctylene, cyclodecylene, adamantane-diyl, norbornane-diyl, exo-tetrahydrodicyclopentadiene-diyl, and the like can be given, of which cyclohexylene is preferred.

[0171] As the arylene group having 6 to 12 carbon atoms, specifically, for example, phenylene, xylylene, biphenylene, naphthylene, 2,2'-methylenebisphenyl, and the like can be given, of which phenylene is preferred.

[0172] Next, the cross-linkable group represented by X in the above formula (B) is described.

[0173] X (cross-linkable group) in the above formula (B) is a cross-linkable group represented by the following formula (X4) among the cross-linkable groups represented by the following formulas (X1) to (X4).

[0174] [Chemical Formula 5]

[0175]

[0176] In the above formulas (X1) to (X4), * indicates the bonding position with L 2 in the above formula (B), and R 8 in the above formula (X4) indicates any one of a hydrogen atom, a methyl group, and an ethyl group. In the above formula (X4), S indicates a functional group having an ethylenically unsaturated double bond.

[0177] Here, as the functional group having an ethylenically unsaturated double bond, specifically, for example, a vinyl group, an allyl group, a styryl group, an acryloyl group, a methacryloyl group can be given, of which an acryloyl group or a methacryloyl group is preferred.

[0178] In the present application, for the reason that the strength of the optical laminate of the present application described later becomes higher, and the handleability when forming other layers using the optical laminate of the present application described later becomes good, it is preferred that the repeating unit B contains a repeating unit in which X in the above formula (B) is a cross-linkable group represented by any one of the above formulas (X1) to (X3) (hereinafter, also simply referred to as "repeating unit B1") and a repeating unit in which X in the above formula (B) is a cross-linkable group represented by the above formula (X4) (hereinafter, also simply referred to as "repeating unit B2").

[0179] As the repeating unit A containing a photo-orienting group represented by the above formula (A), specifically, for example, the following repeating units A-1 to A-44 can be given. In the following formulae, Me represents a methyl group, and Et represents an ethyl group. In the following specific examples, the "1,4-cyclohexyl group" contained in the divalent linking group of the repeating units A-1 to A-10 can be either of a cis-form and a trans-form, but is preferably a trans-form.

[0180] [Chemical Formula 6]

[0181]

[0182] [Chemical Formula 7]

[0183]

[0184]

[0185] On the other hand, as the repeating unit B (repeating unit Bl) containing a cross-linking group represented by the above formula (B), specifically, for example, the following repeating units B-1 to B-17 can be given.

[0186] [Chemical Formula 8]

[0187]

[0188] Further, as the repeating unit B (repeating unit B2) containing a cross-linking group represented by the above formula (B), specifically, for example, the following repeating units B-18 to B-47 can be given.

[0189] [Chemical Formula 9]

[0190]

[0191] The content a of the above repeating unit A and the content b of the above repeating unit B of the photo-orienting copolymer used in the present application preferably satisfy the following formula (12), more preferably the following formula (13), further preferably the following formula (14), and particularly preferably the following formula (15) in terms of a mass ratio.

[0192] 0.03 ≤ a / (a+b) ≤ 0.5... (12)

[0193] 0.03 ≤ a / (a+b) ≤ 0.3... (13)

[0194] 0.03 ≤ a / (a+b) ≤ 0.2... (14)

[0195] 0.05 ≤ a / (a+b) ≤ 0.2... (15)

[0196] Further, when the photo-alignment copolymer used in the present application has the above-mentioned repeating unit B1 and has the above-mentioned repeating unit B2, for the reason of maintaining good liquid crystal alignment property, adhesion, and further improving the strength of the optically anisotropic layer including the photo-alignment film, the content a of the above-mentioned repeating unit A, the content b1 of the above-mentioned repeating unit B1, and the content b2 of the above-mentioned repeating unit B2 satisfy the following formula (16) in terms of mass ratio, and more preferably satisfy the following formula (17).

[0197] 0.05 ≤ b2 / (a + b1 + b2) ≤ 0.7 …… (16)

[0198] 0.10 ≤ b2 / (a + b1 + b2) ≤ 0.5 …… (17)

[0199] The above-mentioned photo-alignment copolymer used in the present application can have other repeating units in addition to the above-mentioned repeating unit A and the repeating unit B, as long as the effects of the present application are not hindered.

[0200] As the monomer (radical polymerizable monomer) forming such other repeating units, for example, an acrylate compound, a methacrylate compound, a maleimide compound, an acrylamide compound, acrylonitrile, maleic anhydride, a styrene compound, a vinyl compound, and the like can be given.

[0201] The synthesis method of the photo-alignment copolymer used in the present application is not particularly limited, and for example, it can be synthesized by mixing the monomer forming the above-mentioned repeating unit A, the monomer forming the above-mentioned repeating unit B, and the monomer forming an arbitrary other repeating unit, and performing polymerization in an organic solvent using a radical polymerization initiator.

[0202] For the reason that the liquid crystal alignment property is further improved, the weight average molecular weight (Mw) of the photo-alignment copolymer used in the present application is preferably 10,000 to 500,000, and more preferably 30,000 to 300,000.

[0203] Herein, the weight average molecular weight and the number average molecular weight in the present application are values measured by a gel permeation chromatography (GPC) method under the conditions shown below.

[0204] • Solvent (eluent): THF (tetrahydrofuran)

[0205] • Apparatus name: TOSOH HLC-8320 GPC

[0206] • Column: 3 TOSOH TSKgel Super HZM-H (4.6 mm x 15 cm) were used in series

[0207] • Column temperature: 40°C

[0208] • Sample concentration: 0.1 mass%

[0209] • Flow rate: 1.0 ml / min

[0210] • Calibration curve: Calibration curve obtained using seven samples of TSK standard polystyrene Mw = 2,800,000 ~ 1,050 (Mw / Mn = 1.03 ~ 1.06) manufactured by TOSOH

[0211] 〔Optically anisotropic layer absorbing light〕

[0212] The optically anisotropic layer absorbing light used in the present application is a layer in which the degree of light absorption differs depending on the direction, and generally has an absorption axis and a polarization axis (transmission axis).

[0213] The thickness of the optically anisotropic layer absorbing light used in the present application is preferably from 0.1 μm to 3 μm, and more preferably from 0.1 μm to 2 μm.

[0214] The optically anisotropic layer absorbing light used in the present application preferably contains a dichroic substance.

[0215] Also, the optically anisotropic layer absorbing light used in the present application preferably contains a dichroic substance and also contains a liquid crystalline compound.

[0216] Also, the optically anisotropic layer absorbing light used in the present application preferably contains a dichroic azo compound.

[0217] <Dichroic substance>

[0218] The dichroic substance used in the present application is not particularly limited, and examples include visible light absorbing substances (dichroic pigments, dichroic azo compounds), light emitting substances (fluorescent substances, phosphorescent substances), ultraviolet light absorbing substances, infrared light absorbing substances, nonlinear optical substances, carbon nanotubes, inorganic substances (e.g., quantum rods), and the like, and a dichroic substance (dichroic pigment) conventionally known can be used. Also, a dichroic substance having liquid crystallinity is also preferable.

[0219] Specifically, for example, the dichroic substance described in

[0067] to

[0071] of Japanese Patent Application Publication No. 2013-228706,

[0008] to

[0026] of Japanese Patent Application Publication No. 2013-227532,

[0008] to

[0015] of Japanese Patent Application Publication No. 2013-209367,

[0045] to

[0058] of Japanese Patent Application Publication No. 2013-014883,

[0012] to

[0029] of Japanese Patent Application Publication No. 2013-109090,

[0009] to

[0017] of Japanese Patent Application Publication No. 2013-101328,

[0051] to

[0065] of Japanese Patent Application Publication No. 2013-037353,

[0049] to

[0073] of Japanese Patent Application Publication No. 2012-063387,

[0016] to

[0018] of Japanese Patent Application Publication No. H11-305036,

[0009] to

[0011] of Japanese Patent Application Publication No. 2001-133630,

[0030] to

[0169] of Japanese Patent Application Publication No. 2011-215337,

[0021] to

[0075] of Japanese Patent Application Publication No. 2010-106242,

[0011] to

[0025] of Japanese Patent Application Publication No. 2010-215846,

[0017] to

[0069] of Japanese Patent Application Publication No. 2011-048311,

[0013] to

[0133] of Japanese Patent Application Publication No. 2011-213610,

[0074] to

[0246] of Japanese Patent Application Publication No. 2011-237513,

[0005] to

[0051] of Japanese Patent Application Publication No. 2016-006502,

[0005] to

[0041] of International Publication No. 2016 / 060173,

[0008] to

[0062] of International Publication No. 2016 / 136561,

[0014] to

[0033] of International Publication No. 2017 / 154835,

[0014] to

[0033] of International Publication No. 2017 / 154695,

[0013] to

[0037] of International Publication No. 2017 / 195833, and the like can be mentioned.

[0220] In the present application, two or more kinds of dichroic substances can be used at the same time, and for example, from the viewpoint of making the polarizer close to black, it is preferable to use at least one kind of dichroic substance having an absorption maximum wavelength in the range of 370 to 550 nm and at least one kind of dichroic substance having an absorption maximum wavelength in the range of 500 to 700 nm at the same time.

[0221] The above-described dichroic substance can have a crosslinkable group.

[0222] As the crosslinkable group described above, specifically, for example, a (meth)acryloyl group, an epoxy group, an oxetanyl group, a styryl group, or the like can be given, of which a (meth)acryloyl group is preferred.

[0223] The above dichroic substance is preferably 1 to 50 mass% and more preferably 3 to 30 mass% and further preferably 10 to 30 mass% with respect to the solid content of the light absorption anisotropic layer.

[0224] < Liquid crystalline compound >

[0225] As the liquid crystalline compound used in the present application, both a low-molecular liquid crystalline compound and a high-molecular liquid crystalline compound can be used.

[0226] Here, the "low-molecular liquid crystalline compound" refers to a liquid crystalline compound that does not have a repeating unit in the chemical structure.

[0227] Also, the "high-molecular liquid crystalline compound" refers to a liquid crystalline compound that has a repeating unit in the chemical structure.

[0228] As the low-molecular liquid crystalline compound, for example, a liquid crystalline compound described in Japanese Patent Application Publication No. 2013-228706 can be given.

[0229] As the high-molecular liquid crystalline compound, for example, a thermotropic liquid crystalline polymer described in Japanese Patent Application Publication No. 2011-237513 can be given.

[0230] Also, the high-molecular liquid crystalline compound can have a crosslinkable group (for example, an acryloyl group and a methacryloyl group) at the terminal.

[0231] The liquid crystalline compound used in the present application is preferably a liquid crystalline compound having a polymerizable group (polymerizable liquid crystalline compound).

[0232] Here, as the polymerizable group, specifically, for example, a (meth)acryloyl group, a vinyl group, a styryl group, an allyl group, or the like can be given, of which a (meth)acryloyl group is preferred.

[0233] In the present application, one kind of liquid crystalline compound can be used alone, or two or more kinds of liquid crystalline compounds can be used simultaneously.

[0234] Also, in the present application, it is preferred that a high-molecular liquid crystalline compound be contained, and it is more preferred that a high-molecular liquid crystalline compound be used simultaneously with a low-molecular liquid crystalline compound.

[0235] The content of the liquid crystalline compound is preferably 25 to 2000 parts by mass, more preferably 33 to 1000 parts by mass, and further preferably 50 to 500 parts by mass, relative to 100 parts by mass of the dichroic substance. By adjusting the content of the liquid crystalline compound within the above range, the degree of orientation of the polarizer is further improved.

[0236] 〔Cured layer〕

[0237] The cured layer used in the present application is preferably a cured layer having a thickness of 100 nm or less.

[0238] As the cured layer, various publicly known cured layers can be used. For example, a layer containing a liquid crystalline compound or a layer obtained by curing a composition containing a multifunctional monomer can be given. It is preferable to have a refractive index capable of matching the refractive index of the light-absorbing anisotropic layer.

[0239] 〔Layer containing polyvinyl alcohol resin〕

[0240] The layer containing any polyvinyl alcohol resin (PVA layer) used in the present application is preferably a layer containing a polyvinyl alcohol resin having a thickness of 2 μm or less.

[0241] 〔Surface film〕

[0242] The surface film used in the present application is generally preferably disposed at the outermost side in the obtained optical laminate.

[0243] The surface film is not particularly limited, and various publicly known surface films can be used. For example, a surface film having a hard coat layer and a substrate can be given.

[0244] As the material constituting the surface film, for example, a (meth)acrylic resin, a polycarbonate resin, a polystyrene resin, a polyolefin resin, a cyclic polyolefin resin, a glutaric anhydride resin, a glutarimide resin, a cellulose resin, a polyester resin, a polyimide resin, and a mixed resin of a plurality of resins selected from these can be given, of which a cyclic polyolefin resin, a (meth)acrylic resin, a polyimide resin, or a polyester resin is preferable. From the viewpoint of flexibility, a polyimide resin is preferable.

[0245] The surface film can contain an ultraviolet absorber.

[0246] As the (meth)acrylic resin, for example, a (meth)acrylic polymer having a ring structure in the main chain, i.e., a polymer having a lactone ring, a maleic anhydride-based polymer having a succinic anhydride ring, a polymer having a glutaric anhydride ring, a polymer containing a glutarimide ring, and the like can be given in addition to a methacrylic resin and an acrylic resin.

[0247] The hard coat layer is a layer for imparting hardness or scratch resistance to the laminate.

[0248] The hard coat layer can be formed, for example, by applying a hard coat layer-forming composition to a substrate and curing it.

[0249] Further, in order to impart other functions, other functional layers can be laminated on the hard coat layer.

[0250] Further, by adding fillers or additives to the hard coat layer, the hard coat layer itself can be imparted with mechanical, electrical or optical physical properties or chemical properties such as water or oil repellency.

[0251] The hard coat layer preferably has excellent scratch resistance. Specifically, when a pencil hardness test, which is an index of scratch resistance, is performed, it is preferable that 3H or more be achieved.

[0252] The thickness of the hard coat layer is preferably 0.1 to 6 μm, more preferably 3 to 6 μm.

[0253] The hard coat layer is preferably formed by curing a curable composition.

[0254] The curable composition is preferably prepared as a liquid coating composition.

[0255] An example of the curable composition includes a monomer, oligomer or polymer for forming a matrix binder and an organic solvent.

[0256] In the present application, the surface film is not limited to the form having a substrate and a hard coat layer, and can be only a substrate or only a hard coat layer, for example.

[0257] [Phase difference film]

[0258] Any phase difference film used in the present application can use various publicly known films. The in-plane retardation value of the phase difference film is not particularly limited, and the phase difference film can be a λ / 4 plate or a λ / 2 plate. Further, it can be a phase difference film composed of a plurality of layers.

[0259] In the present specification, the "λ / 4 plate" means a plate having a λ / 4 function, and specifically, a plate having 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).

[0260] For example, as a form in which the λ / 4 plate is a single layer structure, specifically, a phase difference film in which a polymer thin film is stretched or an optical anisotropic layer having a λ / 4 function is provided on a support body, and as a form in which the λ / 4 plate is a multi-layer structure, specifically, a wideband λ / 4 plate in which a λ / 4 plate and a λ / 2 plate are laminated can be given.

[0261] The material constituting the phase difference film is not particularly limited, and various polymer films, layers containing various liquid crystalline compounds, and the like can be given.

[0262] [Image display device]

[0263] The image display device of the present application includes the above-described laminate and an image display element.

[0264] The image display element used in the image display device of the present application is not particularly limited, and a liquid crystal cell, an organic electroluminescence (hereinafter, referred to as "EL") display panel, a plasma display panel, and the like can be given.

[0265] Among these, a liquid crystal cell or an organic EL display panel is preferred, and a liquid crystal cell is more preferred. That is, as the image display device of the present application, a liquid crystal display device using a liquid crystal cell as an image display element, an organic EL display device using an organic EL display panel as a display element, and more preferably an organic EL display device are preferred.

[0266] [LIQUID CRYSTAL CELL]

[0267] The liquid crystal cell used in the liquid crystal display device is preferably a VA (Vertical Alignment) mode, an OCB (Optically Compensated Bend) mode, an IPS (In-Plane-Switching) mode, or a TN (Twisted Nematic) mode, but is not particularly limited thereto.

[0268] In the liquid crystal cell of the TN mode, rod-like liquid crystalline molecules are oriented substantially horizontally at the time of no voltage application, and further twisted and oriented at 60 to 120°. The liquid crystal cell of the TN mode is most often used for a color TFT (Thin Film Transistor) liquid crystal display device, and is described in many documents.

[0269] In a liquid crystal cell of the VA mode, rod-like liquid crystalline molecules are oriented substantially vertically when no voltage is applied. In the liquid crystal cell of the VA mode, in addition to (1) a liquid crystal cell of the VA mode in the narrow sense in which rod-like liquid crystalline molecules are oriented substantially vertically when no voltage is applied and are oriented substantially horizontally when a voltage is applied (described in Japanese Patent Application Laid-Open No. 2-176625), there are also (2) a liquid crystal cell of the MVA mode in which the VA mode is made multi-domain in order to widen the viewing angle (described in SID 97, Digest of tech. Papers 28 (1997) 845), (3) a liquid crystal cell of the n-ASM mode in which rod-like liquid crystalline molecules are oriented substantially vertically when no voltage is applied and are twisted and oriented multi-domain when a voltage is applied (described in Proceedings of the Japan Liquid Crystal Discussion Group 58-59 (1998)), and (4) a liquid crystal cell of the SURVIVAL mode (presented at LCD International 98). Also, it can be any one of the PVA (Patterned Vertical Alignment) type, the optical alignment type, and the PSA (Polymer-Sustained Alignment) type. Details of these modes are described in detail in Japanese Patent Application Laid-Open No. 2006-215326 and Japanese Patent Application Laid-Open No. 2008-538819.

[0270] In a liquid crystal cell of the IPS mode, rod-like liquid crystalline molecules are oriented substantially in parallel with respect to the substrate, and the liquid crystal molecules are planar responsive by applying an electric field in parallel with the substrate plane. The IPS mode becomes black display in a state where no electric field is applied, and the absorption axes of the pair of polarizing plates above and below are orthogonal. In Japanese Patent Application Laid-Open No. 10-054982, Japanese Patent Application Laid-Open No. 11-202323, Japanese Patent Application Laid-Open No. 9-292522, Japanese Patent Application Laid-Open No. 11-133408, Japanese Patent Application Laid-Open No. 11-305217, Japanese Patent Application Laid-Open No. 10-307291, and the like, there are disclosed methods for improving the viewing angle by reducing light leakage at the time of black display in the oblique direction using an optical compensation sheet.

[0271] (Organic EL display device)

[0272] As an example of the image display device of the present application, an organic EL display device, for example, can preferably be selected from a mode in which the above-described laminate of the present application and an organic EL display panel are sequentially provided from the visual recognition side.

[0273] More preferably, the organic EL display panel is in a manner in which the above-mentioned inventive laminate including the λ / 4 plate, the organic EL display panel are sequentially provided from the visually recognized side. In this case, the laminate is provided in the order of a surface film, an adhesive layer, a light-absorbing anisotropic layer, an orientation layer, and a phase difference film as needed from the visually recognized side.

[0274] Further, the organic EL display panel is a display panel configured using an organic EL element in which an organic light-emitting layer (an organic electroluminescent layer) is sandwiched between electrodes (between a cathode and an anode). The structure of the organic EL display panel is not particularly limited, and a publicly known structure can be employed.

[0275] Example

[0276] Hereinafter, the present application will be further explained in detail according to examples. The materials, amounts, proportions, contents of treatment, steps of treatment, and the like shown in the following examples can be appropriately changed as long as the purpose of the present application is not deviated. Therefore, the scope of the present application should not be limitatively interpreted by the examples shown below.

[0277] [Example 1]

[0278] Formation of the Photo-Alignment Layer PA1

[0279] As the support, a TAC (Triacetyl cellulose) film (TJ40UL, thickness 40 μm, manufactured by FUJIFILM Corporation) was used.

[0280] Next, the orientation layer-forming composition PA1 described later was continuously coated on the support using a wire bar. By drying the support on which the coating film was formed using a warm air of 140°C for 120 seconds, and then, the coating film was subjected to polarized light ultraviolet irradiation (10 mJ / cm2, using an ultrahigh pressure mercury lamp), the photo-alignment layer PA1 was formed, thereby obtaining a TAC film with the photo-alignment layer. 2

[0281] Further, the film thickness of the photo-alignment layer PA1 was 1.0 μm.

[0282]

[0283]

[0284] Polymer PA-1

[0285] [Chemical Formula 10]

[0286]

[0287] Acid generator PAG-1

[0288] [Chemical Formula 11] ​

[0289]

[0290] Acid generator CPI-110F

[0291] [Chem. 12]

[0292]

[0293] <Formation of light absorbing anisotropic layer P1>

[0294] A light absorbing anisotropic layer forming composition P1 of the following composition was continuously coated on the obtained photoalignment layer PA1 using a wire bar to form a coated layer P1.

[0295] Next, the coated layer P1 was heated at 140°C for 90 seconds and the coated layer P1 was cooled to become room temperature (23°C).

[0296] Next, heated at 80°C for 60 seconds and cooled again to become room temperature.

[0297] Then, using a high pressure mercury lamp, irradiation was performed for 60 seconds under irradiation conditions of illuminance 28 mW / cm 2 to form a light absorbing anisotropic layer P1 on the photoalignment layer PA1.

[0298] Further, the film thickness of the light absorbing anisotropic layer P1 was 0.4 μm.

[0299]

[0300] Azo dye Y-1

[0301] [Chem. 13]

[0302]

[0303] Azo dye M-1

[0304] [Chem. 14]

[0305]

[0306] Azo dye C-1

[0307] [Chem. 15]

[0308]

[0309] Polymer liquid crystalline compound P-1

[0310] [Chem. 16]

[0311]

[0312] Liquid crystalline compound L-1

[0313] [Chemical Formula 17]

[0314]

[0315] Surface modifier F-1

[0316] [Chemical Formula 18]

[0317]

[0318] <Formation of the cured layer L1>

[0319] A composition for cured layer formation L1 of the following composition was continuously coated on the obtained light-absorbing anisotropic layer P1 using a wire bar, thereby forming a composition layer L1.

[0320] Next, the composition layer L1 was dried at room temperature, and then irradiated for 10 seconds using a high-pressure mercury lamp under irradiation conditions of an illuminance of 28 mW / cm2, thereby forming a cured layer L1 on the light-absorbing anisotropic layer P1. 2

[0321] In addition, the film thickness of the cured layer L1 was 30 nm.

[0322]

[0323]

[0324] Mixture of rod-like liquid crystalline compounds L-2 (the numerical values in the following formula represent mass%, and R represents a group bonded through an oxygen atom.)

[0325] [Chemical Formula 19]

[0326]

[0327] Modified trimethylolpropane triacrylate

[0328] [Chemical Formula 20]

[0329]

[0330] The following photopolymerization initiator I-1

[0331] [Chemical Formula 21]

[0332]

[0333] <Formation of the PVA layer B1>

[0334] ​​A polyvinyl alcohol (PVA) layer-forming coating liquid B1 of the following composition was continuously coated on the cured layer L1 using a wire bar.

[0335] Then, a PVA layer having a thickness of 1.0 μm was formed on the cured layer L1 by drying under a warm air at 100°C for 2 minutes.

[0336]

[0337] Modified polyvinyl alcohol

[0338] [Chemical Formula 22]

[0339]

[0340] <Production of Layered Body 1>

[0341] The adhesive layer N1 side of the adhesive sheet N1 produced below was laminated on the above PVA layer B1 to complete the layered body 1 of Example 1. In addition, the thickness of the adhesive layer was 20 μm.

[0342] (Production of Adhesive Sheet N1)

[0343] In a reaction apparatus equipped with a stirrer, a thermometer, a reflux cooler, and a nitrogen gas introduction tube, nitrogen gas was introduced, and the air in the reaction apparatus was replaced with nitrogen gas.

[0344] Then, butyl acrylate 70 parts by mass, methyl acrylate 30 parts by mass, acrylic acid 4 parts by mass, N,N-dimethyl methacrylamide 2 parts by mass, azobisisobutyronitrile 0.1 part by mass, and ethyl acetate 120 parts by mass were added to the reaction apparatus.

[0345] While this was stirred, it was allowed to react in a nitrogen gas stream at 60°C for 8 hours, and a solution of an acrylic copolymer having a weight average molecular weight of 1.5 million was obtained. Further, dilution with ethyl acetate was performed to obtain a copolymer solution 1 having a solid content of 15%.

[0346] Next, a solution (adhesive composition N1) in which, relative to 100 parts by mass of the solid content of the copolymer solution 1, polyisocyanate (Coronate-L, manufactured by Nippon Polyurethane Industry Co., Ltd.) 3 parts by mass, aluminum trisacetylacetonate (aluminum chelate A, manufactured by Kawaken Fine Chemicals Co., Ltd.) 0.2 parts by mass, and γ-mercaptopropylmethyldimethoxysilane (KBM-803, manufactured by Shin-Etsu Chemical Co., Ltd.) 0.1 parts by mass were mixed was prepared.

[0347] Next, the prepared adhesive composition N1 was coated on a PET film coated with silicone resin (hereinafter, also referred to as "release film") and, by drying at 90°C to remove the solvent, an adhesive sheet N1 having an adhesive layer N1 of 20 μm in thickness was produced. The storage modulus of the adhesive layer N1 was 0.3 MPa.

[0348] [Example 2]

[0349] In the formation of the light-absorbing anisotropic layer of Example 1, except that the support was changed to PET (thickness 40 μm), the laminate of Example 2 was obtained in the same manner as in Example 1.

[0350] [Example 3]

[0351] In the formation of the light-absorbing anisotropic layer of Example 1, except that the support was changed to cellulose acylate film TJ100UL (thickness 100 μm, manufactured by FUJIFILM Corporation), the laminate of Example 3 was obtained in the same manner as in Example 1.

[0352] [Examples 4 to 7]

[0353] In the formation of the light-absorbing anisotropic layer of Example 1, the composition for forming a light-absorbing anisotropic layer and the thickness of the photoalignment layer were changed as in Table 2 below, respectively, and otherwise, the laminates of Examples 4 to 7 were obtained in the same manner as in Example 1.

[0354] In addition, in Table 2 below, the details of the compositions for forming a light-absorbing anisotropic layer P2 and P3 are as follows.

[0355]

[0356]

[0357] Azo dye C-2

[0358] [Chemical Formula 23]

[0359]

[0360] Polymer liquid crystalline compound P-2 [Chemical Formula 24]

[0361]

[0362]

[0363]

[0364] Azo dye Y-2

[0365] [Chemical Formula 25]

[0366]

[0367] Azo dye M-2

[0368] [Chemical Formula 26]

[0369]

[0370] Azo dye C-3

[0371] [Chemical Formula 27]

[0372]

[0373] [Example 8]

[0374] Formation of the light-absorbing anisotropic layer P4

[0375] A light orientation layer PA1 was formed in the same manner as in Example 1, and a TAC film with the light orientation layer was obtained.

[0376] The light-absorbing anisotropic layer-forming composition P4 prepared below was continuously applied to the obtained light orientation layer PA1 using a wire bar, and a coated layer P4 was formed.

[0377] Next, the coated layer P4 was heated at 120°C for 60 seconds, and the coated layer P4 was cooled to become room temperature (23°C).

[0378] Then, the light-absorbing anisotropic layer P4 was formed on the light orientation layer PA1 by irradiation for 60 seconds using a high-pressure mercury lamp under irradiation conditions of illuminance 28 mW / cm 2

[0379] In addition, the film thickness of the light-absorbing anisotropic layer P4 was 1.7 μm.

[0380] A light-absorbing anisotropic layer-forming composition P4 was prepared with the following composition, dissolved by heating at 50°C for 3 hours while stirring, and filtered using a 0.45 μm filter.

[0381]

[0382]

[0383] Azo dye M-3

[0384] [Chemical Formula 28]

[0385]

[0386] Azo dye Y-3 ​

[0387] [Chemical Formula 29]

[0388]

[0389] azo dye C-4

[0390] [Chemical Formula 30]

[0391]

[0392] liquid crystal compound P-3 (compound A / compound B = 75 / 25 mixture)

[0393] [Chemical Formula 31]

[0394]

[0395] compound B

[0396] [Chemical Formula 32]

[0397]

[0398] <Manufacture of the laminate 8>

[0399] A PVA layer B1, an adhesive layer were formed on the above light absorbing anisotropic layer P4 in the same manner as in Example 1, whereby the laminate 8 of Example 8 was completed.

[0400] (Examples 9 to 16)

[0401] In the formation of the adhesive layer of Example 1, the adhesive layers in the above adhesive sheet N1 and the following adhesive sheets N2 to N6 were used with the adhesive layers shown in Table 2 below changed to the thicknesses shown in Table 2 below, and otherwise, the laminates of Examples 9 to 16 were obtained in the same manner as in Example 1.

[0402] <Manufacture of the adhesive sheet N2>

[0403] In the same manner as in the adhesive sheet N1, an acrylic copolymer 2 having an average molecular weight of 2 million and a molecular weight distribution (Mw / Mn) of 3.0 was obtained by solution polymerization of butyl acrylate 95 parts by mass and acrylic acid 5 parts by mass.

[0404] Next, a solution (adhesive composition N2) obtained by mixing 10 parts by mass of a multifunctional acrylate monomer (ARONIX M-315, manufactured by TOAGOSEI CO., LTD.), 1 part by mass of a photopolymerization initiator (Irgacure 500, manufactured by BASF Corporation), 1 part by mass of trimethylolpropane toluene diisocyanate (Coronate-L, manufactured by Nippon Polyurethane Industry Co., Ltd.), and 0.2 parts by mass of a silane coupling agent (KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.) with respect to 100 parts by mass of the solid content of the acrylic copolymer 2 was prepared.

[0405] Next, the prepared adhesive composition N2 was applied to a PET film (release film) on which a silicone resin was applied, the solvent was removed by drying at 90°C, and ultraviolet rays (UV) were irradiated under the following conditions to produce an adhesive sheet N2 having an adhesive layer N2 of 20 μm in thickness. The storage modulus of the adhesive layer N2 was 0.6 MPa.

[0406] (UV irradiation conditions)

[0407] • Fusion Co., Ltd. electrodeless lamp H bulb

[0408] • Illuminance: 600 mW / cm 2

[0409] • Light amount: 150 mJ / cm 2

[0410] In addition, the UV illuminance and the light amount were measured using "UVPF-36" manufactured by EYE GRAPHICS CO., LTD.

[0411] <Production of adhesive sheets N3 to N5>

[0412] First, the acrylic polymer was prepared according to the following procedure.

[0413] In a reaction vessel equipped with a cooling tube, a nitrogen gas introduction tube, a thermometer, and a stirring device, 70 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of ethyl acrylate, 6 parts by mass of hydroxyethyl methacrylate, and 4 parts by mass of acrylic acid were polymerized by a solution polymerization method to obtain an acrylic polymer Al having an average molecular weight of 300,000.

[0414] Next, using the obtained acrylic polymer Al, adhesive sheets N3 to N5 were produced according to the following procedure.

[0415] Specifically, 1 part by mass of trimethylolpropane toluene diisocyanate (Coronate-L, manufactured by Nippon Polyurethane Industry Co., Ltd.) and 0.2 parts by mass of a silane coupling agent (KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.) were added to 100 parts by mass of the solid components of the acrylic polymer A1, and a solution (adhesive composition N6) was prepared.

[0416] Next, the prepared adhesive composition was applied to a PET film (release film) on which a silicone resin was applied using a die coater, and dried at 150°C for 3 hours, and thus an adhesive sheet N3 to N5 having an adhesive layer N3 to N5 of a desired thickness was produced. The storage modulus of the adhesive layer N3 to N5 is shown in Table 1 below.

[0417] [Table 1]

[0418]

[0419] <Production of an adhesive sheet N6>

[0420] An acrylic copolymer 2 was obtained in the same manner as the adhesive sheet N2.

[0421] Next, a solution (adhesive composition N6) in which 1 part by mass of trimethylolpropane toluene diisocyanate (Coronate-L, manufactured by Nippon Polyurethane Industry Co., Ltd.) and 0.2 parts by mass of a silane coupling agent (KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.) were mixed with respect to 100 parts of the solid components of the acrylic copolymer 2 was prepared.

[0422] Next, the prepared adhesive composition N6 was applied to a PET film (release film) on which a silicone resin was applied, and the solvent was removed by drying at 90°C, and thus an adhesive sheet N6 having an adhesive layer N6 of a thickness of 25 μm was produced. The storage modulus of the adhesive layer N6 was 0.1 MPa.

[0423] [Example 17]

[0424] As the support, TJ100UL (thickness: 100 μm, manufactured by FUJIFILM Corporation) was used instead of TJ40UL, and otherwise, the laminate of Example 17 was obtained in the same manner as Example 15.

[0425] [Comparative Example 1]

[0426] The laminate of Comparative Example 1 was obtained in the same manner as Example 10, except that the thickness of the adhesive layer was changed to the values shown in Table 2 below.

[0427] [Comparative Example 2]

[0428] A layer stack of Comparative Example 2 was obtained in the same manner as in Example 1 except that the alignment layer-forming composition PA1 was changed to an alignment layer-forming composition PA2 of the following composition.

[0429]

[0430] Polymer PA-2

[0431] [Chemical Formula 33]

[0432]

[0433] [Evaluation]

[0434] "Peeling Evaluation"

[0435] The obtained layer stack was cut into a size of 25 mm x 150 mm, and after peeling the release film, the adhesive layer side was pressure-bonded to a glass substrate (Corning Inc. Eagle XG).

[0436] Then, a tape was attached to the support of the layer stack and peeled.

[0437] The peeled support was observed for the peeling surface, and the evaluation was performed according to the following criteria. The results are shown in Table 2 below.

[0438] AA: The peeling surface was not rough

[0439] A: The peeling surface was rough

[0440] B: The peeling residue due to the alignment layer was observed, and the area of the peeling residue was less than 5% relative to the area of the peeling surface

[0441] C: The peeling residue due to the alignment layer was observed, and the area of the peeling residue was 5% or more relative to the area of the peeling surface

[0442] [Table 2]

[0443]

[0444] As is clear from the results shown in Table 2, when the thickness from the support to the adhesive layer, excluding the thickness of the support and the adhesive layer, was 5 μm or less, and the thickness of the adhesive layer was less than 5 μm, it was difficult to peel only the support (Comparative Example 1).

[0445] Further, it was found that when the cinnamyl compound used for forming the alignment layer did not have a functional group having an ethylenic unsaturated double bond, it was difficult to peel only the support (Comparative Example 2).

[0446] On the other hand, when the thickness from the support to the adhesive layer excluding the thickness of the support and the adhesive layer is 5 μm or less, and the thickness of the adhesive layer is 5 to 50 μm, and the alignment layer is a photo-alignment layer formed using an alignment layer-forming composition containing a cinnamyl compound having a functional group, and the functional group has an ethylenic unsaturated double bond, the support is easily peeled off (Examples 1 to 17).

[0447] Explanation of symbols

[0448] 1 - support, 2 - alignment layer, 3 - light-absorbing anisotropic layer, 4 - adhesive layer, 5 - cured layer, 6 - layer containing polyvinyl alcohol resin, 7 - surface film, 8 - phase difference film, 10 - laminate.

Claims

1. A laminate having, in order, a support, an orientation layer, a light-absorbing anisotropic layer, and an adhesive layer, the light-absorbing anisotropic layer contains a dichroic substance and a liquid-crystalline compound, the dichroic substance is two or more kinds, a thickness from the support to the adhesive layer excluding the support and the adhesive layer is 5 μm or less, a thickness of the adhesive layer is 5 μm to 50 μm, the orientation layer is a photo-alignment layer formed using an orientation layer-forming composition containing a cinnamyl compound having a functional group having an ethylenic unsaturated double bond.

2. The laminate according to claim 1, wherein the functional group having an ethylenic unsaturated double bond is a methacryl group or an acryl group.

3. The laminate according to claim 1 or 2, wherein a layer containing a polyvinyl alcohol resin is provided between the light-absorbing anisotropic layer and the adhesive layer.

4. The laminate according to claim 1 or 2, wherein the support is a cellulose-based resin or a polyester-based resin.

5. The laminate according to claim 1 or 2, wherein the adhesive layer contains an adhesive containing an acrylic polymer.

6. The laminate according to claim 5, wherein a weight average molecular weight of the acrylic polymer is 100,000 or more.

7. The laminate according to claim 1 or 2, wherein a storage modulus of the adhesive layer is 100 kPa to 20 MPa.

8. The laminate according to claim 7, wherein the storage modulus of the adhesive layer is 100 kPa to 2 MPa.

9. The laminate according to claim 1 or 2, wherein a thickness of the light-absorbing anisotropic layer is 0.1 μm to 3 μm.

10. The laminate according to claim 1 or 2, wherein a thickness of the orientation layer is 0.1 μm to 2 μm.

11. The laminate according to claim 1 or 2, wherein the liquid-crystalline compound is a polymerizable liquid-crystalline compound.

12. The laminate according to claim 1 or 2, wherein the liquid-crystalline compound is a high-molecular liquid-crystalline compound.

13. The laminate according to claim 12, wherein the light-absorbing anisotropic layer further contains a low-molecular liquid-crystalline compound.

14. The laminate according to claim 1 or 2, wherein the support is in contact with the orientation layer.

15. The laminate according to claim 1 or 2, wherein the orientation layer is in contact with the light-absorbing anisotropic layer.

16. The laminate according to claim 1 or 2, wherein the support has been peeled off.

17. The laminate according to claim 1 or 2, wherein a phase difference film is further provided, and the phase difference film is disposed on the orientation layer side.

18. An image display device having the laminate according to any one of claims 1 to 17 and an image display element.

Images