Laminate and image display device

Abstract

To provide, in a laminate having a support, an alignment layer and an anisotropic light absorption layer, a laminate in which it becomes easy to peel off only the support, and to provide an image display device using the laminate.SOLUTION: A laminate of the present invention comprises a support, an alignment layer, a light absorption anisotropic layer, and an adhesive layer in this order, and a thickness between the support and the adhesive layer, excluding the support and the adhesive layer, is 5 μm or less, and a thickness of the adhesive layer is 5 μm to 50 μm.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a laminate and an image display device. [Background technology]

[0002] In recent years, various studies have been conducted on optically absorptive anisotropic layers formed using dichroic materials. For example, Patent Document 1 discloses "a circular polarizing plate comprising a liquid crystal cured film, a pressure-sensitive adhesive layer, a retardation film, and a pressure-sensitive adhesive layer laminated in this order, wherein the liquid crystal cured film is a film having a thickness of 3 μm or less, in which a polymerizable liquid crystal compound is cured in a state where the compound is aligned horizontally relative to the surface of the substrate, and the circular polarizing plate is a film containing a dichroic dye" ([Claim 16]).

[0003] On the other hand, in response to recent demands for thinner display devices, there has been proposed a method of thinning the display device by peeling off the support used in the above-mentioned circularly polarizing plate or the like. Patent Document 1 aims to provide an optically anisotropic sheet that provides a thin optically anisotropic film (

[0004] ). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-027431 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the layer structure is complex due to the expression of various functions, it is extremely difficult to control at which interface peeling occurs during transfer. It has been found that controlling the peeling interface is particularly difficult in laminates in which each layer is very thin due to factors such as the trend toward thinner polarizers, etc. For example, even when attempting to peel only the support from a laminate having a support, an alignment layer, and an optically absorptive anisotropic layer, peeling may occur at the interface between the alignment layer and the optically absorptive anisotropic layer.

[0006] Therefore, an object of the present invention is to provide a laminate having a support, an alignment layer, and an optically absorbing anisotropic layer, which makes it easy to peel off only the support, and an image display device using the same. [Means for solving the problem]

[0007] As a result of extensive research to achieve the above object, the present inventors have found that the properties of the adhesive layer when bonding to another member affect the releasability at the other interface. In other words, we have discovered that in a laminate having a support, an alignment layer, an optically absorbing anisotropic layer, and an adhesive layer in this order, and in which the thickness from the support to the adhesive layer, excluding the support and adhesive layer, is 5 μm or less, by setting the thickness of the adhesive layer to a specific value, it is possible to provide a laminate in which it is easy to peel off only the support.

[0008] That is, it has been found that the above object can be achieved by the following configuration.

[0009] [1] A film having a support, an alignment layer, a light absorption anisotropic layer, and an adhesive layer in this order; The thickness from the support to the adhesive layer, excluding the support and the adhesive layer, is 5 μm or less; The thickness of the adhesive layer is 5 μm to 50 μm, A laminate, wherein the alignment layer is a photo-alignment layer formed using a composition for forming an alignment layer, which contains a cinnamoyl compound having a functional group with an ethylenically unsaturated double bond. [2] The laminate according to [1], wherein the adhesive layer has a storage modulus of 100 kPa to 20 MPa. [3] The laminate according to [2], wherein the storage modulus of the adhesive layer is 100 kPa to 2 MPa. [4] The laminate according to any one of [1] to [3], wherein the thickness of the adhesive layer is more than 10 μm and not more than 50 μm. [5] The laminate according to any one of [1] to [4], wherein the optically absorptive anisotropic layer contains a dichroic substance and a liquid crystalline compound. [6] The laminate according to any one of [1] to [5], wherein the optically absorptive anisotropic layer contains a dichroic azo compound. [7] The laminate according to any one of [1] to [6], wherein the optically absorptive anisotropic layer has a thickness of 0.1 μm to 3 μm. [8] The laminate according to any one of [1] to [7], wherein the thickness of the alignment layer is 0.1 μm to 2 μm. [9] The laminate according to [8], wherein the thickness of the orientation layer is more than 0.5 μm and not more than 2 μm.

[10] The laminate according to any one of [1] to [9], wherein the cinnamoyl compound is a photo-alignable copolymer having a repeating unit A containing a photo-alignable group represented by formula (A) described later and a repeating unit B containing a crosslinkable group represented by formula (B) described later.

[11] L in formula (A) described below 1 is a divalent linking group represented by any one of formulas (1) to (10) described below.

[12] The laminate according to [5], wherein the liquid crystal compound is a polymerizable liquid crystal compound.

[13] The laminate according to [5], wherein the liquid crystal compound is a polymeric liquid crystal compound.

[14] The laminate according to

[13] , wherein the optically absorptive anisotropic layer further contains a low-molecular-weight liquid crystal compound.

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

[14] , further comprising a cured layer having a thickness of 100 nm or less between the optically absorptive anisotropic layer and the adhesive layer.

[16] The laminate according to

[15] , wherein the cured layer contains a liquid crystalline compound.

[17] The laminate according to

[15] , wherein the cured layer is a layer obtained by curing a composition containing a polyfunctional monomer.

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

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

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

[18] , wherein the support and the alignment layer are in contact with each other.

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

[19] , wherein the alignment layer and the optically absorptive anisotropic layer are in contact with each other.

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

[20] and a surface film, wherein the adhesive layer and the surface film are in contact with each other.

[22] The laminate according to

[21] , wherein the support is peeled off.

[23] The laminate according to

[22] , further comprising a retardation film, the retardation film being disposed on the alignment layer side.

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

[23] and an image display element. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a laminate having a support, an alignment layer, and an optically absorbing anisotropic layer, in which it is easy to peel off only the support, and an image display device using the same. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic cross-sectional view showing an example of an embodiment of a laminate of the present invention. [Figure 2] 1 is a schematic cross-sectional view showing an example of an embodiment of a laminate of the present invention. [Figure 3] 1 is a schematic cross-sectional view showing an example of an embodiment of a laminate of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will be described in detail below. The following description of the components may be based on typical embodiments of the present invention, but the present invention is not limited to such embodiments. In this specification, a numerical range expressed using "to" means a range that includes the numerical values before and after "to" as the lower and upper limits. In this specification, parallel and perpendicular do not mean parallel and perpendicular in the strict sense, but mean a range of ±5° from parallel or perpendicular.

[0013] In addition, in this specification, each component may be a substance corresponding to the component, and may be used alone or in combination of two or more. Here, when two or more substances are used in combination for each component, the content of that component refers to the total content of the substances used in combination, unless otherwise specified. Furthermore, in this specification, "(meth)acrylate" is a notation representing "acrylate" or "methacrylate", "(meth)acrylic" is a notation representing "acrylic" or "methacrylic", and "(meth)acryloyl" is a notation representing "acryloyl" or "methacryloyl". In this specification, the liquid crystal composition and liquid crystal compound conceptually include those that no longer exhibit liquid crystallinity due to curing or the like.

[0014] [Laminate] The laminate of the present invention is a laminate having a support, an alignment layer, a light absorption anisotropic layer, and an adhesive layer in this order. Furthermore, in the laminate of the present invention, 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. Furthermore, in the laminate of the present invention, the alignment layer is a photo-alignment layer formed using a composition for forming an alignment layer, which contains a cinnamoyl compound having a functional group with an ethylenically unsaturated double bond. Next, the overall configuration of the laminate of the present invention will be described with reference to Figs. 1 to 3, and then each component will be described in detail.

[0015] The laminate 10 shown in FIG. 1 has a support 1, an alignment layer 2, an optically absorptive anisotropic layer 3, and an adhesive layer 4 in this order. Furthermore, the thickness of the laminate 10 from the support 1 to the adhesive layer 4, excluding the support 1 and the adhesive layer 4, i.e., the distance from the surface of the support 1 on the alignment layer 2 side to the surface of the adhesive layer 4 on the optically absorptive anisotropic layer 3 side, is 5 μm or less, and preferably 1 μm to 4 μm. Furthermore, in the laminate 10, the thickness of the adhesive layer 4 is 5 μm to 50 μm.

[0016] In the laminate of the present invention, as shown in FIG. 1, the support 1 and the alignment layer 2 are preferably in contact with each other. In the laminate of the present invention, the alignment layer 2 and the optically absorptive anisotropic layer 3 are preferably in contact with each other, as shown in FIG.

[0017] As shown in FIG. 2, the laminate of the present invention preferably further comprises a cured layer 5 having a thickness of 100 nm or less between the light absorption anisotropic layer 3 and the adhesive layer 4 .

[0018] As shown in FIG. 2, the laminate of the present invention preferably further comprises a layer containing a polyvinyl alcohol resin (hereinafter also abbreviated as "PVA layer") 6 having a thickness of 2 μm or less between the light absorption anisotropic layer 3 and the adhesive layer 4. When the laminate of the present invention includes both the cured layer 5 and the layer 6 containing a polyvinyl alcohol resin, it preferably has the optically absorptive anisotropic layer 3, the cured layer 5, the layer 6 containing a polyvinyl alcohol resin, and the adhesive layer 4 in this order, as shown in Figure 2.

[0019] The laminate of the present invention preferably further has a surface film 7, as shown in Fig. 3. In this case, it is preferable that the surface film 7 and the adhesive layer 4 are in contact with each other, i.e., the surface film 7 and the other layer are bonded together by the adhesive layer 4.

[0020] The laminate of the present invention may be used without the support 1 as shown in FIG. 3 by peeling off the support 1 shown in FIG. Furthermore, the laminate of the present invention may further include a retardation film 8 as shown in FIG. 3, and in this case, the retardation film 8 is preferably disposed on the alignment layer 2 side.

[0021] [Adhesive layer] The adhesive layer used in the present invention is not particularly limited to a material as long as it has a thickness of 5 μm to 50 μm, and various known materials can be used.

[0022] The storage modulus of the adhesive layer used in the present invention is preferably 10 kPa to 20 MPa, more preferably 10 kPa to 2 MPa, from the viewpoint of making it easier to adjust the releasability of the support.

[0023] <<Method for measuring storage modulus>> In the present invention, the storage modulus refers to a value measured at a frequency of 1 Hz and 25°C using a dynamic viscoelasticity measuring device (DVA-200) manufactured by IT Measurement & Control Co., Ltd.

[0024] The thickness of the adhesive layer used in the present invention is 5 μm to 50 μm, and preferably more than 10 μm and 50 μm or less. By setting the content within the above range, it becomes easier to adjust the releasability.

[0025] <Materials used in the adhesive layer> Examples of materials contained in the adhesive layer used in the present invention include rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, urethane-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl alcohol-based adhesives, polyvinylpyrrolidone-based adhesives, polyacrylamide-based adhesives, and cellulose-based adhesives. Among these, acrylic adhesives (pressure-sensitive adhesives) are preferred from the viewpoints of transparency, weather resistance, heat resistance, and the like.

[0026] As the acrylic adhesive, preferred is an acrylic polymer such as a copolymer of a (meth)acrylate in which the alkyl group in the ester moiety has 20 or less carbon atoms, such as a methyl group, an ethyl group, or a butyl group, and a (meth)acrylic monomer having a functional group, such as (meth)acrylic acid or hydroxyethyl (meth)acrylate. Such adhesives containing acrylic polymers are preferred because they have excellent adhesive properties and can be relatively easily peeled off after being attached to other components without leaving any adhesive residue on the display device. The glass transition temperature of such an acrylic polymer is preferably 25°C or lower, more preferably 0°C or lower. Furthermore, the weight average molecular weight of such an acrylic polymer is preferably 100,000 or more.

[0027] [Support] The support used in the present invention is not particularly limited, and various known supports can be used. The support is preferably a peelable support.

[0028] Examples of materials constituting the support used in the present invention include cellulose-based resins, acrylic resins, methacrylic 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 multiple types of resins selected from these, and among these, cellulose-based resins or polyester-based resins are preferred.

[0029] From the viewpoint of making it easier to adjust the releasability, the thickness of the support is preferably from 10 to 200 μm, more preferably from 50 to 200 μm, and even more preferably from 100 to 200 μm.

[0030] Furthermore, by adjusting the modulus of elasticity of the support in accordance with the storage modulus of the adhesive layer, it becomes easier to adjust the releasability.

[0031] Furthermore, by selecting a support that is difficult to penetrate depending on the composition of the alignment layer, the adhesive strength between the support and the alignment layer can be reduced, making it easier to adjust the peelability.

[0032] [Alignment layer] The alignment layer used in the present invention is a photo-alignment layer formed using a composition for forming an alignment layer that contains a cinnamoyl compound having a functional group with an ethylenically unsaturated double bond.

[0033] The thickness of the alignment layer used in the present invention is preferably 0.1 μm to 2 μm, and more preferably more than 0.5 μm and 2 μm or less.

[0034] As described above, the photo-alignment layer used in the present invention is a photo-alignment layer formed using an alignment layer-forming composition containing a cinnamoyl compound having a functional group with an ethylenically unsaturated double bond (hereinafter referred to as a "polymerizable group" in this paragraph). Among these, a photo-alignment layer formed using a photo-alignment copolymer as the cinnamoyl compound is more preferred. When the photo-alignment layer composition contains the same type of polymerizable group (e.g., a methacryloyl group or an acryloyl group) as that contained in the composition of the optically absorbing anisotropic layer, the layers are chemically bonded to each other, increasing the interlayer adhesion between the photo-alignment layer and the optically absorbing anisotropic layer. This is advantageous for realizing a laminate that allows easy peeling of the support alone, which is the object of the present invention.

[0035] <Photo-aligned copolymer> The photo-alignable copolymer used in the present invention is a photo-alignable copolymer having a repeating unit A containing a photo-alignable group represented by the following formula (A) and a repeating unit B containing a crosslinkable group represented by the following formula (B). [ka] In the above formula (A), R 1 represents a hydrogen atom or a methyl group. 1 represents a divalent linking group containing a nitrogen atom and a cycloalkane ring, and some of the carbon atoms constituting the cycloalkane ring may be substituted with a heteroatom selected from the group consisting of nitrogen, oxygen, and sulfur. 2 , R 3 , R 4 , R 5 and R 6 each independently represents a hydrogen atom or a substituent, R 2 , R3 , R 4 , R 5 and R 6 Among these, two adjacent groups may be bonded to form a ring. In the above formula (B), R 7 represents a hydrogen atom or a methyl group, and L 2 represents a divalent linking group, and X represents a crosslinkable group represented by the following formula (X4). [ka] In the above formula (X4), * represents L in the above formula (B). 2 represents the bonding position with, and S represents a functional group having an ethylenically unsaturated double bond.

[0036] In the present invention, by using a photoalignable copolymer having a repeating unit A containing a photoalignable 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 properties of the obtained photoalignment film are improved. Although the details of this are not clear, the present inventors speculate as follows. That is, L in the above formula (A) 1 It is believed that the divalent linking group represented by the formula (I) contains a nitrogen atom and a cycloalkane ring, which increases hydrogen bonding properties and molecular rigidity, thereby suppressing molecular motion, resulting in improved solvent resistance. Similarly, L in the above formula (A) 1 The divalent linking group represented by the formula (I) contains a nitrogen atom and a cycloalkane ring, which increases the glass transition temperature of the copolymer and improves the stability over time of the resulting photo-alignment film, resulting in good liquid crystal alignment properties regardless of the timing of forming the optically anisotropic layer.

[0037] Next, L in the above formula (A) 1The following describes a divalent linking group containing a nitrogen atom and a cycloalkane ring, represented by the formula:

[0023] In the present invention, as described above, some of the carbon atoms constituting the cycloalkane ring may be substituted with a heteroatom selected from the group consisting of nitrogen, oxygen, and sulfur. In addition, when some of the carbon atoms constituting the cycloalkane ring are substituted with nitrogen atoms, the cycloalkane ring may not have a nitrogen atom separate from the cycloalkane ring.

[0038] In addition, L in the above formula (A) 1 The cycloalkane ring contained in the divalent linking group represented by the formula (I) is preferably a cycloalkane ring having 6 or more carbon atoms, and specific examples thereof include a cyclohexane ring, a cycloheptane ring, a cyclooctane ring, a cyclododecane ring, and a cyclodocosane ring.

[0039] In the present invention, L in the above formula (A) is preferably 0.01 to 0.15 because the liquid crystal alignment property is better. 1 is preferably a divalent linking group represented by any one of the following formulas (1) to (10). [ka] In the above formulas (1) to (10), *1 represents the bonding position to the carbon atom constituting the main chain in the above formula (A), and *2 represents the bonding position to the carbon atom constituting the carbonyl group in the above formula (A).

[0040] Among the divalent linking groups represented by any of the above formulas (1) to (10), a divalent linking group represented by any of the above formulas (2), (3), (7) and (8) is preferred because it provides a good balance between the solubility in the solvent used to form the photo-alignment film and the solvent resistance of the resulting photo-alignment film.

[0041] In addition, L in the above formula (A) 1 may be a divalent linking group other than the above-mentioned "divalent linking group containing a nitrogen atom and a cycloalkane ring." Such a divalent linking group is preferably a divalent linking group combining at least two or more groups selected from the group consisting of an optionally substituted linear, branched or cyclic alkylene group having 1 to 18 carbon atoms, an optionally substituted arylene group having 6 to 12 carbon atoms, an ether group (-O-), a carbonyl group (-C(=O)-), and an optionally substituted imino group (-NH-), because this facilitates interaction of the photoalignable group with the liquid crystal compound and improves the liquid crystal alignment of the adjacent liquid crystal layer.

[0042] Next, R in the above formula (A) 2 , R 3 , R 4 , R 5 and R 6 The substituents represented by one embodiment of the formula (A) will be described below. 2 , R 3 , R 4 , R 5 and R 6 However, as described above, it may be a hydrogen atom instead of a substituent.

[0043] R in the above formula (A) 2 , R 3 , R 4 , R 5 and R 6 The substituents represented by one embodiment of formula (1) are preferably each 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), because this facilitates interaction of the photoalignable group with the liquid crystal compound and results in better liquid crystal alignment. [ka] In the formula (11), * represents the bonding position to the benzene ring in the formula (A), and R 9 represents a monovalent organic group.

[0044] Examples of halogen atoms include fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms, with fluorine atoms and chlorine atoms being preferred.

[0045] With regard to the linear, branched or cyclic alkyl group having 1 to 20 carbon atoms, the linear alkyl group is preferably an alkyl group having 1 to 6 carbon atoms, and specific examples thereof include a methyl group, an ethyl group, and an n-propyl group. The branched alkyl group is preferably an alkyl group having 3 to 6 carbon atoms, and specific examples include an isopropyl group and a tert-butyl group. The cyclic alkyl group is preferably an alkyl group having 3 to 6 carbon atoms, and specific examples include a cyclopropyl group, a cyclopentyl group, and a cyclohexyl group.

[0046] As the linear halogenated alkyl group having 1 to 20 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms is preferred. Specific examples include a trifluoromethyl group, a perfluoroethyl group, a perfluoropropyl group, and a perfluorobutyl group, and among these, a trifluoromethyl group is preferred.

[0047] The alkoxy group having 1 to 20 carbon atoms is preferably an alkoxy group having 1 to 18 carbon atoms, more preferably an alkoxy group having 6 to 18 carbon atoms, and even more preferably an alkoxy group having 6 to 14 carbon atoms. Specific examples of suitable alkoxy groups include a methoxy group, an ethoxy group, an n-butoxy group, a methoxyethoxy group, an n-hexyloxy group, an n-octyloxy group, an n-decyloxy group, an n-dodecyloxy group, and an n-tetradecyloxy group, and among these, an n-hexyloxy group, an n-octyloxy group, an n-decyloxy group, an n-dodecyloxy group, and an n-tetradecyloxy group are more preferred.

[0048] As the aryl group having 6 to 20 carbon atoms, an aryl group having 6 to 12 carbon atoms is preferred, and specific examples include a phenyl group, an α-methylphenyl group, and a naphthyl group, with a phenyl group being particularly preferred.

[0049] As the aryloxy group having 6 to 20 carbon atoms, an aryloxy group having 6 to 12 carbon atoms is preferred, and specific examples include a phenyloxy group and a 2-naphthyloxy group, with the phenyloxy group being particularly preferred.

[0050] Examples of amino groups include primary amino groups (-NH2); secondary amino groups such as a methylamino group; and tertiary amino groups such as a dimethylamino group, a diethylamino group, a dibenzylamino group, and groups in which the nitrogen atom of a nitrogen-containing heterocyclic compound (e.g., pyrrolidine, piperidine, piperazine, etc.) serves as a bonding bond.

[0051] Regarding the group represented by the above formula (11), R 9 Examples of the monovalent organic group represented by include linear or cyclic alkyl groups having 1 to 20 carbon atoms. The linear alkyl group is preferably an alkyl group having 1 to 6 carbon atoms, and specific examples include a methyl group, an ethyl group, and an n-propyl group, with a methyl group or an ethyl group being particularly preferred. The cyclic alkyl group is preferably an alkyl group having 3 to 6 carbon atoms, and specific examples include a cyclopropyl group, a cyclopentyl group, and a cyclohexyl group, with a cyclohexyl group being particularly preferred. In addition, R in the above formula (11) 9 The monovalent organic group represented by may be a combination of the above-mentioned linear alkyl groups and cyclic alkyl groups either directly or via a single bond.

[0052] In the present invention, the photoalignable group is easily interacted with the liquid crystal compound, and the liquid crystal alignment is improved. For this reason, R 2 , R 3 , R 4 , R 5 and R 6 Of these, at least R 4represents the above-mentioned substituent, and further, for the reasons that the linearity of the obtained photoalignable copolymer is improved, the interaction with the liquid crystal compound becomes easier, and the liquid crystal alignment property becomes further improved, R 2 , R 3 , R 5 and R 6 More preferably, both represent a hydrogen atom.

[0053] In the present invention, the reaction efficiency is improved when the resulting photo-alignment film is irradiated with light. 4 is preferably an electron-donating substituent. Here, the electron-donating substituent (electron-donating group) refers to a substituent having a Hammett value (Hammett substituent constant σp) of 0 or less, and examples thereof include alkyl groups, halogenated alkyl groups, and alkoxy groups among the above-mentioned substituents. Of these, an alkoxy group is preferred, and an alkoxy group having 6 to 16 carbon atoms is more preferred, and an alkoxy group having 7 to 10 carbon atoms is even more preferred, because this provides better liquid crystal alignment properties.

[0054] Next, L in the above formula (B) 2 The divalent linking group represented by will be explained.

[0055] The divalent linking group is preferably a divalent linking group combining at least two groups selected from the group consisting of a linear, branched, or cyclic alkylene group having 1 to 18 carbon atoms, which may have a substituent; an arylene group having 6 to 12 carbon atoms, which may have a substituent; an ether group (-O-), a carbonyl group (-C(=O)-), and an imino group (-NH-), which may have a substituent, because this makes it easier for the photoalignable group to interact with the liquid crystal compound and results in better liquid crystal alignment.

[0056] Here, examples of the substituent that the alkylene group, arylene group, and imino group may have include a halogen atom, an alkyl group, an alkoxy group, an aryl group, an aryloxy group, a cyano group, a carboxy group, an alkoxycarbonyl group, and a hydroxyl group. Examples of halogen atoms include fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms, with fluorine atoms and chlorine atoms being preferred. The alkyl group is, for example, preferably a linear, branched, or cyclic alkyl group having 1 to 18 carbon atoms, more preferably an alkyl group having 1 to 8 carbon atoms (for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a t-butyl group, a cyclohexyl group, etc.), still more preferably an alkyl group having 1 to 4 carbon atoms, and particularly preferably a methyl group or an ethyl group. The alkoxy group is, for example, preferably an alkoxy group having 1 to 18 carbon atoms, more preferably an alkoxy group having 1 to 8 carbon atoms (for example, a methoxy group, an ethoxy group, an n-butoxy group, a methoxyethoxy group, etc.), still more preferably an alkoxy group having 1 to 4 carbon atoms, and particularly preferably a methoxy group or an ethoxy group. Examples of the aryl group include aryl groups having 6 to 12 carbon atoms, and specific examples include a phenyl group, an α-methylphenyl group, and a naphthyl group, with the phenyl group being preferred. Examples of aryloxy groups include phenoxy, naphthoxy, imidazoyloxy, benzimidazoyloxy, pyridin-4-yloxy, pyrimidinyloxy, quinazolinyloxy, purinyloxy, and thiophen-3-yloxy. Examples of the alkoxycarbonyl group include methoxycarbonyl and ethoxycarbonyl.

[0057] Regarding the linear, branched, or cyclic alkylene group having 1 to 18 carbon atoms, specific examples of the linear alkylene group include a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a decylene group, an undecylene group, a dodecylene group, a tridecylene group, a tetradecylene group, a pentadecylene group, a hexadecylene group, a heptadecylene group, and an octadecylene group. Specific examples of branched alkylene groups include a dimethylmethylene group, a methylethylene group, a 2,2-dimethylpropylene group, and a 2-ethyl-2-methylpropylene group. Specific examples of the cyclic alkylene group include a cyclopropylene group, a cyclobutylene group, a cyclopentylene group, a cyclohexylene group, a cyclooctylene group, a cyclodecylene group, an adamantane-diyl group, a norbornane-diyl group, and an exo-tetrahydrodicyclopentadiene-diyl group, and among these, a cyclohexylene group is preferred.

[0058] Specific examples of the arylene group having 6 to 12 carbon atoms include a phenylene group, a xylylene group, a biphenylene group, a naphthylene group, and a 2,2'-methylenebisphenyl group, and among these, a phenylene group is preferred.

[0059] Next, the crosslinkable group represented by X in the above formula (B) will be explained.

[0060] X (crosslinkable group) in the above formula (B) is a crosslinkable group represented by the following formula (X4) among the crosslinkable groups represented by the following formulae (X1) to (X4). [ka] In the above formulas (X1) to (X4), * represents L in the above formula (B). 2 represents the bonding position with R 8 represents a hydrogen atom, a methyl group, or an ethyl group, and in the above formula (X4), S represents a functional group having an ethylenically unsaturated double bond. Here, specific examples of the functional group having an ethylenically unsaturated double bond include a vinyl group, an allyl group, a styryl group, an acryloyl group, and a methacryloyl group, and an acryloyl group or a methacryloyl group is preferred.

[0061] In the present invention, for the reasons that the strength of the optical laminate of the present invention described later is increased and that the handleability is improved when forming other layers using the optical laminate of the present invention described later, it is preferred that the repeating unit B contains a repeating unit in which X in formula (B) is a crosslinkable group represented by any one of formulas (X1) to (X3) above (hereinafter also abbreviated as "repeating unit B1"), and a repeating unit in which X in formula (B) is a crosslinkable group represented by formula (X4) above (hereinafter also abbreviated as "repeating unit B2").

[0062] Specific examples of the repeating unit A containing a photoalignment group represented by formula (A) above include repeating units A-1 to A-44 shown below. In the formulae below, Me represents a methyl group, and Et represents an ethyl group. In the specific examples below, the "1,4-cyclohexyl group" contained in the divalent linking group of repeating units A-1 to A-10 may be either a cis or trans form, but is preferably a trans form. [ka] JPEG0007719249000007.jpg45142JPEG0007719249000008.jpg36147JPEG0007719249000009.jpg38143 [ka] JPEG0007719249000011.jpg53122JPEG0007719249000012.jpg43131JPEG0007719249 000013.jpg39126JPEG0007719249000014.jpg39103JPEG0007719249000015.jpg4787

[0063] On the other hand, specific examples of the repeating unit B (repeating unit B1) containing a crosslinkable group represented by the above formula (B) include repeating units B-1 to B-17 shown below. [ka] JPEG0007719249000017.jpg37126JPEG0007719249000018.jpg39124

[0064] Specific examples of the repeating unit B (repeating unit B2) containing a crosslinkable group represented by the above formula (B) include repeating units B-18 to B-47 shown below. [ka] JPEG0007719249000020.jpg44148JPEG0007719249000021.jpg31147JPEG0007719249000022.jpg23148

[0065] In the photoalignable copolymer used in the present invention, the content a of the above-mentioned repeating unit A and the content b of the above-mentioned repeating unit B preferably satisfy the following formula (12) in terms of mass ratio, more preferably satisfy the following formula (13), even more preferably satisfy the following formula (14), and particularly preferably satisfy the following formula (15). 0.03 ≦ a / (a+b) ≦ 0.5 ···(12) 0.03 ≦ a / (a+b) ≦ 0.3 ···(13) 0.03 ≦ a / (a+b) ≦ 0.2 ···(14) 0.05 ≦ a / (a+b) ≦ 0.2 ···(15)

[0066] Furthermore, when the photo-alignable copolymer used in the present invention has the repeating unit B2 described above in addition to the repeating unit B1 described above, the strength of the optically anisotropic layer including the photo-alignment film can be further increased while maintaining good liquid crystal alignment and adhesion. For this reason, it is preferable that the content a of the repeating unit A described above, the content b1 of the repeating unit B1 described above, and the content b2 of the repeating unit B2 described above satisfy the following formula (16) in mass ratio, and it is more preferable that they satisfy the following formula (17): 0.05 ≦ b2 / (a+b1+b2) ≦ 0.7 ···(16) 0.10 ≦ b2 / (a+b1+b2) ≦ 0.5 ···(17)

[0067] The photoalignable copolymer used in the present invention may contain other repeating units in addition to the repeating unit A and repeating unit B described above, as long as the effects of the present invention are not impaired. Examples of the monomer (radical polymerizable monomer) that forms such other repeating units include acrylic acid ester compounds, methacrylic acid ester compounds, maleimide compounds, acrylamide compounds, acrylonitrile, maleic anhydride, styrene compounds, and vinyl compounds.

[0068] The method for synthesizing the photo-alignable copolymer used in the present invention is not particularly limited, and for example, the copolymer can be synthesized by mixing a monomer that forms the repeating unit A described above, a monomer that forms the repeating unit B described above, and a monomer that forms any other repeating unit, and polymerizing the mixture in an organic solvent using a radical polymerization initiator.

[0069] The weight average molecular weight (Mw) of the photoalignable copolymer used in the present invention is preferably from 10,000 to 500,000, more preferably from 30,000 to 300,000, because this further improves the liquid crystal alignment property. Here, the weight average molecular weight and number average molecular weight in the present invention are values measured by gel permeation chromatography (GPC) under the conditions shown below. Solvent (eluent): THF (tetrahydrofuran) ·Device name: TOSOH HLC-8320GPC Column: TOSOH TSKgel Super HZM-H (4.6mm x 15cm ) connected to three Column temperature: 40℃ Sample concentration: 0.1% by mass ·Flow rate: 1.0ml / min Calibration curve: TOSOH TSK standard polystyrene. Calibration curves are based on seven samples with Mw = 2,800,000 to 1,050 (Mw / Mn = 1.03 to 1.06).

[0070] [Light absorption anisotropic layer] The light absorption anisotropic layer used in the present invention is a layer in which the degree of light absorption varies depending on the direction, and generally has an absorption axis and a polarization axis (transmission axis).

[0071] The thickness of the optically absorptive anisotropic layer used in the present invention is preferably 0.1 μm to 3 μm, and more preferably 0.1 μm to 2 μm.

[0072] The light absorption anisotropic layer used in the present invention preferably contains a dichroic material. The light absorption anisotropic layer used in the present invention preferably contains a liquid crystal compound in addition to a dichroic substance. The light absorption anisotropic layer used in the present invention preferably contains a dichroic azo compound.

[0073] <Dichroic substances> The dichroic substance used in the present invention is not particularly limited, and examples thereof include visible light absorbing substances (dichroic dyes, dichroic azo compounds), luminescent substances (fluorescent substances, phosphorescent substances), ultraviolet absorbing substances, infrared absorbing substances, nonlinear optical substances, carbon nanotubes, inorganic substances (e.g., quantum rods), etc. Conventionally known dichroic substances (dichroic dyes) can be used. Dichroic substances having liquid crystal properties are also preferred.

[0074] Specifically, for example, paragraphs

[0067] to

[0071] of Japanese Patent Application Laid-Open No. 2013-228706, paragraphs

[0008] to

[0026] of Japanese Patent Application Laid-Open No. 2013-227532, paragraphs

[0008] to

[0015] of Japanese Patent Application Laid-Open No. 2013-209367, paragraphs

[0045] to

[0058] of Japanese Patent Application Laid-Open No. 2013-109090, paragraphs

[0012] to

[0029] of Japanese Patent Application Laid-Open No. 2013-101328, Paragraphs

[009] to

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

[0030] to

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

[0021] to

[0017] of Japanese Patent Publication No. 2013-37353, paragraphs

[0051] to

[0065] of Japanese Patent Publication No. 2012-63387, paragraphs

[0049] to

[0073] of Japanese Patent Publication No. 2012-63387, paragraphs

[0016] to

[0018] of Japanese Patent Publication No. 2011-305036, paragraphs

[0009] to

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

[0030] to

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

[0021] to

[0024] of Japanese Patent Publication No. 2010-106242

[0075] Paragraphs

[0011] to

[0025] of JP 2010-215846 A, paragraphs

[0017] to

[0069] of JP 2011-048311 A, paragraphs

[0013] to

[0133] of JP 2011-213610 A, paragraphs

[0074] to

[0246] of JP 2011-237513 A, paragraphs

[0005] to

[0051] of JP 2016-006502 A, International Publication No. Examples of such compounds include those described in paragraphs

[0005] to

[0041] of International Publication No. WO 2016 / 136561, paragraphs

[0008] to

[0062] of International Publication No. WO 2017 / 154835, paragraphs

[0014] to

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

[0013] to

[0037] of International Publication No. WO 2017 / 195833.

[0075] In the present invention, two or more dichroic substances may be used in combination. For example, from the viewpoint of making the polarizer closer to black, it is preferable to use in combination at least one dichroic substance having a maximum absorption wavelength in the wavelength range of 370 to 550 nm and at least one dichroic substance having a maximum absorption wavelength in the wavelength range of 500 to 700 nm.

[0076] The dichroic substance may have a crosslinkable group. Specific examples of the crosslinkable group include a (meth)acryloyl group, an epoxy group, an oxetanyl group, and a styryl group, and among these, a (meth)acryloyl group is preferred.

[0077] The content of the dichroic substance is preferably from 1 to 50% by mass, more preferably from 3 to 30% by mass, and even more preferably from 10 to 30% by mass, based on the solid content of the light absorption anisotropic layer.

[0078] <Liquid crystal compounds> As the liquid crystal compound used in the present invention, either a low molecular weight liquid crystal compound or a high molecular weight liquid crystal compound can be used. Here, the term "low molecular weight liquid crystal compound" refers to a liquid crystal compound that does not have a repeating unit in its chemical structure. The term "polymeric liquid crystal compound" refers to a liquid crystal compound having a repeating unit in its chemical structure.

[0079] Examples of low molecular weight liquid crystal compounds include the liquid crystal compounds described in JP-A-2013-228706.

[0080] Examples of the polymeric liquid crystalline compound include the thermotropic liquid crystalline polymers described in JP-A-2011-237513. The polymeric liquid crystal compound may have a crosslinkable group (for example, an acryloyl group or a methacryloyl group) at the end.

[0081] The liquid crystal compound used in the present invention is preferably a liquid crystal compound having a polymerizable group (polymerizable liquid crystal compound). Specific examples of the polymerizable group include a (meth)acryloyl group, a vinyl group, a styryl group, and an allyl group, with a (meth)acryloyl group being preferred.

[0082] In the present invention, the liquid crystal compound may be used alone or in combination of two or more kinds. In the present invention, it is preferable that the composition contains a polymeric liquid crystal compound, and it is more preferable that the polymeric liquid crystal compound is used in combination with a low molecular weight liquid crystal compound.

[0083] The content of the liquid crystal compound is preferably 25 to 2000 parts by mass, more preferably 33 to 1000 parts by mass, and even more preferably 50 to 500 parts by mass, relative to 100 parts by mass of the dichroic substance. When the content of the liquid crystal compound is within the above range, the degree of orientation of the polarizer is further improved.

[0084] [Hardened layer] The optional hardened layer used in the present invention is preferably a hardened layer having a thickness of 100 nm or less. The cured layer may be any of various known layers. For example, it may be a layer containing a liquid crystal compound or a layer obtained by curing a composition containing a polyfunctional monomer. It is preferable that the cured layer has a refractive index that allows index matching with the light absorption anisotropic layer.

[0085] [Layer containing polyvinyl alcohol resin] The optional polyvinyl alcohol resin-containing layer (PVA layer) used in the present invention is preferably a layer containing a polyvinyl alcohol resin and having a thickness of 2 μm or less.

[0086] [Surface film] The optional surface film used in the present invention is usually preferably disposed on the outermost side in the resulting optical laminate. The surface film is not particularly limited, and various known films can be used. For example, the surface film may have a hard coat layer and a substrate.

[0087] Examples of materials constituting the surface film include (meth)acrylic resins, polycarbonate resins, polystyrene resins, polyolefin resins, cyclic polyolefin resins, glutaric anhydride resins, glutarimide resins, cellulose resins, polyester resins, polyimide resins, and mixed resins of multiple resins selected from these, with cyclic polyolefin resins, (meth)acrylic resins, polyimide resins, and polyester resins being preferred. Furthermore, polyimide resins are preferred from the viewpoint of excellent flexibility. The surface film may contain an ultraviolet absorber.

[0088] Examples of (meth)acrylic resins include methacrylic resins, acrylic resins, and also (meth)acrylic polymers having a ring structure in the main chain, i.e., polymers having a lactone ring, maleic anhydride polymers having a succinic anhydride ring, polymers having a glutaric anhydride ring, and glutarimide ring-containing polymers.

[0089] The hard coat layer is a layer for imparting hardness or scratch resistance to the laminate. The hard coat layer can be formed, for example, by applying a composition for forming a hard coat layer onto a substrate and curing the composition. Furthermore, for the purpose of adding other functions, other functional layers may be laminated on the hard coat layer. Furthermore, by adding a filler or additive to the hard coat layer, it is possible to impart mechanical, electrical or optical physical properties, or chemical properties such as water repellency or oil repellency to the hard coat layer itself. The hard coat layer preferably has excellent scratch resistance, specifically, when a pencil hardness test, which is an index of scratch resistance, is carried out, it preferably achieves a value of 3H or more. The thickness of the hard coat layer is preferably 0.1 to 6 μm, more preferably 3 to 6 μm.

[0090] The hard coat layer is preferably formed by curing a curable composition. The curable composition is preferably prepared as a liquid coating composition. An example of a curable composition includes a matrix-forming binder monomer, oligomer, or polymer and an organic solvent.

[0091] In the present invention, the surface film is not limited to an embodiment having a substrate and a hard coat layer, and may be, for example, only the substrate or only the hard coat layer.

[0092] [Retardation film] Any known retardation film can be used in the present invention. The in-plane retardation value of the retardation film is not particularly limited, and the retardation film may be a λ / 4 plate or a λ / 2 plate. Furthermore, the retardation film may be made up of multiple layers.

[0093] In this specification, a "λ / 4 plate" is a plate having a λ / 4 function, specifically, a plate having the function of converting linearly polarized light of a specific wavelength into circularly polarized light (or circularly polarized light into linearly polarized light). For example, specific examples of a λ / 4 plate having a single layer structure include a stretched polymer film and a retardation film having an optically anisotropic layer with λ / 4 function provided on a support, and specific examples of a λ / 4 plate having a multi-layer structure include a broadband λ / 4 plate formed by laminating a λ / 4 plate and a λ / 2 plate.

[0094] There is no particular limitation on the material constituting the retardation film, and examples thereof include various polymer films and layers containing various liquid crystal compounds.

[0095] [Image display device] The image display device of the present invention includes the above-described laminate and an image display element. The image display element used in the image display device of the present invention is not particularly limited, and examples thereof include a liquid crystal cell, an organic electroluminescence (hereinafter abbreviated as "EL") display panel, and a plasma display panel. Among these, a liquid crystal cell or an organic EL display panel is preferred, and a liquid crystal cell is more preferred. That is, the image display device of the present invention is preferably a liquid crystal display device using a liquid crystal cell as an image display element, or an organic EL display device using an organic EL display panel as a display element, and more preferably an organic EL display device.

[0096] [Liquid crystal cell] The liquid crystal cell used in the liquid crystal display device is preferably in VA (Vertical Alignment) mode, OCB (Optically Compensated Bend) mode, IPS (In-Plane-Switching) mode, or TN (Twisted Nematic) mode, but is not limited to these. In TN mode liquid crystal cells, rod-shaped liquid crystal molecules are aligned substantially horizontally when no voltage is applied, and are further aligned in a twisted orientation of 60 to 120 degrees. TN mode liquid crystal cells are most commonly used as color TFT (Thin Film Transistor) liquid crystal display devices, and are described in numerous literature. In VA-mode liquid crystal cells, rod-shaped liquid crystal molecules are aligned substantially vertically when no voltage is applied. VA-mode liquid crystal cells include (1) narrow-sense VA-mode liquid crystal cells in which rod-shaped liquid crystal molecules are aligned substantially vertically when no voltage is applied and substantially horizontally when voltage is applied (described in JP-A-2-176625), (2) multi-domain VA-mode liquid crystal cells (described in SID97, Digest of Tech. Papers (Proceedings) 28 (1997) 845) to widen the viewing angle, (3) n-ASM-mode liquid crystal cells in which rod-shaped liquid crystal molecules are aligned substantially vertically when no voltage is applied and are aligned in a twisted multi-domain manner when voltage is applied (described in Proceedings of the Japan Liquid Crystal Symposium 58-59 (1998)), and (4) SURVIVAL-mode liquid crystal cells (presented at LCD International 98). The liquid crystal display may be of any of a PVA (Patterned Vertical Alignment) type, an optical alignment type, and a PSA (Polymer-Sustained Alignment) type. Details of these modes are described in Japanese Patent Laid-Open No. 2006-215326 and Japanese Patent Laid-Open No. 2008-538819. In IPS mode liquid crystal cells, rod-shaped liquid crystal molecules are aligned substantially parallel to the substrates, and when an electric field parallel to the substrate surface is applied, the liquid crystal molecules respond in a planar manner. In IPS mode, black display occurs when no electric field is applied, and the absorption axes of a pair of upper and lower polarizing plates are perpendicular to each other. Methods for reducing light leakage during black display in oblique directions and improving the viewing angle using optical compensation sheets are disclosed in JP-A-10-54982, JP-A-11-202323, JP-A-9-292522, JP-A-11-133408, JP-A-11-305217, JP-A-10-307291, and the like.

[0097] [Organic EL display device] A preferred embodiment of an organic EL display device, which is one example of the image display device of the present invention, includes, from the viewer side, the above-described laminate of the present invention and an organic EL display panel in this order. A more preferred embodiment is one in which the laminate of the present invention having the λ / 4 plate and the organic EL display panel are arranged in this order from the viewer side. In this case, the laminate has a surface film, an adhesive layer, a light absorption anisotropic layer, an alignment layer, and a retardation film arranged in this order from the viewer side, as needed. An organic EL display panel is a display panel configured using organic EL elements each having an organic light-emitting layer (organic electroluminescence layer) sandwiched between electrodes (a cathode and an anode). The configuration of the organic EL display panel is not particularly limited, and any known configuration may be used. [Example]

[0098] The present invention will be described in more detail below with reference to examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the examples shown below.

[0099] [Example 1] <Formation of Photo-Alignment Layer PA1> A TAC (triacetyl cellulose) film (TJ40UL, thickness 40 μm, manufactured by Fujifilm Corporation) was used as the support. Next, the alignment layer-forming composition PA1 described later was continuously applied onto the support using a wire bar. The support on which the coating film was formed was dried with hot air at 140°C for 120 seconds, and then the coating film was irradiated with polarized ultraviolet light (10 mJ / cm 2 A photo-alignment layer PA1 was formed by irradiating the TAC film with the photo-alignment layer (using an ultra-high pressure mercury lamp). The thickness of the photo-alignment layer PA1 was 1.0 μm.

[0100] ───────────────────────────────── Composition for forming alignment layer PA1 ───────────────────────────────── 100.00 parts by mass of the following polymer PA-1 5.00 parts by weight of the acid generator PAG-1 (listed below) 0.005 parts by weight of the following acid generator CPI-110TF Xylene 1220.00 parts by mass Methyl isobutyl ketone 122.00 parts by mass ─────────────────────────────────

[0101] Polymer PA-1 [ka]

[0102] Acid generator PAG-1 [ka]

[0103] Acid generator CPI-110F [ka]

[0104] <Formation of Optically Absorbing Anisotropic Layer P1> On the obtained photo-alignment layer PA1, a composition P1 for forming an optically absorptive anisotropic layer having the following composition was continuously applied with a wire bar to form a coating layer P1. Next, the coating layer P1 was heated at 140° C. for 90 seconds, and then cooled to room temperature (23° C.). It was then heated at 80°C for 60 seconds and cooled again to room temperature. Then, a high-pressure mercury lamp was used to illuminate the area at an intensity of 28 mW / cm. 2 The irradiation was carried out for 60 seconds under the irradiation conditions, thereby forming an optically absorptive anisotropic layer P1 on the photo-alignment layer PA1. The thickness of the optically absorptive anisotropic layer P1 was 0.4 μm.

[0105] ---------------------------------------------------------------------------------- Optically absorptive anisotropic layer-forming composition P1 ---------------------------------------------------------------------------------- 0.25 parts by mass of the following azo dye Y-1 0.27 parts by mass of the following azo dye M-1 0.65 parts by mass of the following azo dye C-1 3.59 parts by mass of the following polymer liquid crystal compound P-1 0.12 parts by mass of the following liquid crystal compound L-1 Polymerization initiator IRGACUREOXE-02 (BASF) 0.200 parts by mass 0.026 parts by mass of the following interface improver F-1 Cyclopentanone 47.50 parts by mass Tetrahydrofuran 47.50 parts by mass ----------------------------------------------------------------------------------

[0106] Azo dye Y-1 [ka]

[0107] Azo dye M-1 [ka]

[0108] Azo dye C-1 [ka]

[0109] Polymer liquid crystal compound P-1 [ka]

[0110] Liquid crystal compound L-1 [ka]

[0111] Interface improver F-1 [ka]

[0112] <Formation of hardened layer L1> A composition L1 for forming a cured layer having the following composition was continuously applied onto the obtained optically absorptive anisotropic layer P1 using a wire bar to form a composition layer L1. The composition layer L1 was then dried at room temperature, and then irradiated with a high-pressure mercury lamp at an illumination intensity of 28 mW / cm 2 By irradiating for 10 seconds under the irradiation conditions, a cured layer L1 was formed on the light absorption anisotropic layer P1. The thickness of the cured layer L1 was 30 nm. ---------------------------------------------------------------------------------- Composition L1 for forming hardened layer ---------------------------------------------------------------------------------- 2.43 parts by mass of the following mixture of rod-shaped liquid crystal compounds L-2 0.98 parts by mass of the following modified trimethylolpropane triacrylate 0.20 parts by mass of the following photopolymerization initiator I-1 0.14 parts by mass of the above-mentioned interface improver F-1 1,4-phenylenediboronic acid (Tokyo Chemical Industry Co., Ltd.) 0.10 parts by mass Methyl ethyl ketone 371 parts by mass ----------------------------------------------------------------------------------

[0113] Rod-shaped liquid crystal compound mixture L-2 (the numerical values in the following formula represent mass % and R represents a group bonded via an oxygen atom.) [ka]

[0114] Modified trimethylolpropane triacrylate [ka]

[0115] The following photoinitiator I-1 [Chemical formula]

[0116] <Formation of PVA layer B1> On the cured layer L1, a coating liquid B1 for forming a polyvinyl alcohol (PVA) layer having the following composition was continuously applied with a wire bar. Thereafter, by drying with warm air at 100 °C for 2 minutes, a PVA layer with a thickness of 1.0 μm was formed on the cured layer L1. ―――――――――――――――――――――――――――――――― Coating liquid B1 for forming PVA layer ―――――――――――――――――――――――――――――――― · 3.80 parts by mass of the following modified polyvinyl alcohol · 0.20 parts by mass of initiator Irg2959 · 70 parts by mass of water · 30 parts by mass of methanol ――――――――――――――――――――――――――――――――

[0117] Modified polyvinyl alcohol [Chemical formula]

[0118] <Production of laminate 1> On the above PVA layer B1, the adhesive layer N1 side of the adhesive sheet N1 prepared below was pressure-bonded to complete the laminate 1 of Example 1. The thickness of the adhesive layer was 20 μm. (Production of adhesive sheet N1) Nitrogen gas was introduced into a reaction apparatus equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen inlet tube to replace the air in the reaction apparatus with nitrogen gas. Thereafter, 70 parts by mass of butyl acrylate, 30 parts by mass of methyl acrylate, 4 parts by mass of acrylic acid, 2 parts by mass of N,N-dimethylmethacrylamide, 0.1 part by mass of azobisisobutyronitrile, and 120 parts by mass of ethyl acetate were added to the reactor. This was reacted at 60°C for 8 hours in a nitrogen gas stream while stirring to obtain a solution of an acrylic copolymer with a weight average molecular weight of 1.5 million, which was then diluted with ethyl acetate to obtain copolymer solution 1 with a solid content of 15%. Next, a solution (adhesive composition N1) was prepared by mixing 100 parts by mass of the solid content of copolymer solution 1 with 3 parts by mass of polyisocyanate (Coronate L, manufactured by Nippon Polyurethane Industry Co., Ltd.), 0.2 parts by mass of aluminum trisacetylacetonate (Aluminum Chelate A, manufactured by Kawaken Fine Chemicals Co., Ltd.), and 0.1 parts by mass of γ-mercaptopropylmethyldimethoxysilane (KBM-803, manufactured by Shin-Etsu Chemical Co., Ltd.). The prepared adhesive composition N1 was then applied to a silicone resin-coated PET film (hereinafter also referred to as "release film") and dried at 90°C to remove the solvent, thereby producing an adhesive sheet N1 having an adhesive layer N1 with a thickness of 20 μm. The storage modulus of the adhesive layer N1 was 0.3 MPa.

[0119] [Example 2] A laminate of Example 2 was obtained in the same manner as in Example 1, except that in forming the optically absorptive anisotropic layer of Example 1, the support was changed to PET (thickness: 40 μm).

[0120] [Example 3] A laminate of Example 3 was obtained in the same manner as in Example 1, except that in forming the optically absorptive anisotropic layer of Example 1, the support was changed to a cellulose acylate film TJ100UL (thickness 100 μm, manufactured by Fujifilm Corporation).

[0121] [Examples 4 to 7] The laminates of Examples 4 to 7 were obtained in the same manner as in Example 1, except that in forming the optically absorptive anisotropic layer of Example 1, the composition for forming the optically absorptive anisotropic layer and the thickness of the photo-alignment layer were changed as shown in Table 2 below. In Table 2 below, the details of compositions P2 and P3 for forming the optically absorptive anisotropic layer are as follows:

[0122] ---------------------------------------------------------------------------------- Optically absorptive anisotropic layer-forming composition P2 ---------------------------------------------------------------------------------- 0.25 parts by mass of the above azo dye Y-1 0.27 parts by mass of the above azo dye M-1 0.65 parts by mass of the following azo dye C-2 3.71 parts by mass of the following polymer liquid crystal compound P-2 Polymerization initiator IRGACUREOXE-03 (BASF) 0.151 parts by mass 0.026 parts by mass of the above-mentioned interface improver F-1 Cyclopentanone 47.50 parts by mass Tetrahydrofuran 47.50 parts by mass ----------------------------------------------------------------------------------

[0123] Azo dye C-2 [ka]

[0124] Polymer liquid crystal compound P-2 [ka]

[0125] ---------------------------------------------------------------------------------- Optically absorptive anisotropic layer-forming composition P3 ---------------------------------------------------------------------------------- 0.17 parts by mass of the following azo dye Y-2 0.19 parts by mass of the following azo dye M-2 0.45 parts by mass of the following azo dye C-3 4.07 parts by mass of the polymer liquid crystal compound P-2 Polymerization initiator IRGACUREOXE-03 (BASF) 0.151 parts by mass 0.026 parts by mass of the above-mentioned interface improver F-1 Cyclopentanone 47.50 parts by mass Tetrahydrofuran 47.50 parts by mass ----------------------------------------------------------------------------------

[0126] Azo dye Y-2 [ka]

[0127] Azo dye M-2 [ka]

[0128] Azo dye C-3 [ka]

[0129] [Example 8] <Formation of Optically Absorbing Anisotropic Layer P4> A photo-alignment layer PA1 was formed in the same manner as in Example 1, to obtain a TAC film with a photo-alignment layer. On the obtained photo-alignment layer PA1, the composition P4 for forming an optically absorptive anisotropic layer prepared below was continuously applied with a wire bar to form a coating layer P4. Next, the coating layer P4 was heated at 120° C. for 60 seconds, and then cooled to room temperature (23° C.). Then, a high-pressure mercury lamp was used to illuminate the area at an intensity of 28 mW / cm. 2 The irradiation was carried out for 60 seconds under the irradiation conditions, thereby forming an optically absorptive anisotropic layer P4 on the photo-alignment layer PA1. The thickness of the optically absorptive anisotropic layer P4 was 1.7 μm.

[0130] Composition P4 for forming an optically absorptive anisotropic layer was prepared according to the following formulation, heated and dissolved at 50° C. for 3 hours while stirring, and filtered through a 0.45 μm filter. ---------------------------------------------------------------------------------- Optically absorptive anisotropic layer-forming composition P4 ---------------------------------------------------------------------------------- 2.7 parts by mass of the following azo dye Y-3 2.7 parts by mass of the following azo dye M-3 2.7 parts by mass of the following azo dye C-4 75.5 parts by mass of the following liquid crystal compound P-3 Polymerization initiator IRGACURE819 (BASF) 0.8 parts by mass 0.6 parts by mass of the above-mentioned interface improver F-1 Cyclopentanone 274.5 parts by mass Tetrahydrofuran 640.5 parts by mass ----------------------------------------------------------------------------------

[0131] Azo dye M-3 [ka]

[0132] Azo dye Y-3 [ka]

[0133] Azo dye C-4 [ka]

[0134] Liquid crystal compound P-3 (Compound A below / Compound B below=75 / 25)

[0135] Compound A [ka]

[0136] Compound B [ka]

[0137] <Production of Laminate 8> A PVA layer B1 and an adhesive layer were formed on the optically absorptive anisotropic layer P4 in the same manner as in Example 1, thereby completing a laminate 8 of Example 8.

[0138] [Examples 9 to 16] In forming the adhesive layer of Example 1, the laminates of Examples 9 to 16 were obtained in the same manner as Example 1, except that the adhesive layers shown in Table 2 below were used among the adhesive layers in the adhesive sheet N1 described above and the adhesive sheets N2 to N6 described below, and the thicknesses were changed to those shown in Table 2 below.

[0139] <Preparation of adhesive sheet N2> In the same manner as in the preparation of adhesive sheet N1, 95 parts by mass of butyl acrylate and 5 parts by mass of acrylic acid were polymerized by solution polymerization to obtain acrylic copolymer 2 having an average molecular weight of 2,000,000 and a molecular weight distribution (Mw / Mn) of 3.0. Next, a solution (adhesive composition N2) was prepared by mixing 100 parts by mass of the solid content of acrylic copolymer 2 with 10 parts by mass of a polyfunctional acrylate monomer (Aronix M-315, manufactured by Toa Gosei Co., Ltd.), 1 part by mass of a photopolymerization initiator (Irgacure 500, manufactured by BASF), 1 part by mass of trimethylolpropane tolylene diisocyanate (Coronate L, manufactured by Nippon Polyurethane Co., Ltd.), and 0.2 parts by mass of a silane coupling agent (KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.). The prepared adhesive composition N2 was then applied to a silicone resin-coated PET film (release film), dried at 90°C to remove the solvent, and irradiated with ultraviolet (UV) light under the following conditions to prepare an adhesive sheet N2 having an adhesive layer N2 with a thickness of 20 μm. The storage modulus of the adhesive layer N2 was 0.6 MPa. (UV irradiation conditions) Fusion electrodeless lamp H bulb ·Illuminance: 600mW / cm 2 ·Light amount: 150mJ / cm 2 The UV illuminance and light intensity were measured using the UVPF-36 manufactured by Eye Graphics.

[0140] <Preparation of adhesive sheets N3 to N5> First, an acrylic polymer was prepared according to the following procedure. In a reaction vessel equipped with a condenser, a nitrogen inlet tube, a thermometer, and a stirrer, 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 solution polymerization to obtain an acrylic polymer A1 having an average molecular weight of 300,000. Next, adhesive sheets N3 to N5 were produced using the obtained acrylic polymer A1 according to the following procedure. Specifically, the parts by mass of trimethylolpropane tolylene diisocyanate (Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) shown in Table 1 below were added to 100 parts by mass of the solid content of acrylic polymer A1 to prepare adhesive compositions. The prepared adhesive composition was then applied to a silicone resin-coated PET film (release film) using a die coater and dried at 150°C for 3 hours to produce adhesive sheets N3 to N5 having adhesive layers N3 to N5 of desired thicknesses. The storage moduli of adhesive layers N3 to N5 were as shown in Table 1 below.

[0141] [Table 1]

[0142] <Preparation of adhesive sheet N6> Acrylic copolymer 2 was obtained in the same manner as for adhesive sheet N2. Next, a solution (adhesive composition N6) was prepared by mixing 100 parts of the solid content of acrylic copolymer 2 with 1 part by mass of trimethylolpropane tolylene diisocyanate (Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) and 0.2 parts by mass of a silane coupling agent (KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.). The prepared adhesive composition N6 was then applied to a silicone resin-coated PET film (release film) and dried at 90°C to remove the solvent, producing an adhesive sheet N6 having an adhesive layer N6 with a thickness of 25µm. The storage modulus of the adhesive layer N6 was 0.1MPa.

[0143] [Example 17] A laminate of Example 17 was obtained in the same manner as in Example 15, except that TJ100UL (thickness: 100 μm, manufactured by Fujifilm Corporation) was used as the support instead of TJ40UL.

[0144] [Comparative Example 1] A laminate of Comparative Example 1 was obtained in the same manner as in Example 10, except that the thickness of the adhesive layer was changed to the value shown in Table 2 below.

[0145] Comparative Example 2 A laminate of Comparative Example 2 was obtained in the same manner as in Example 1, except that the composition for forming an alignment layer PA1 was changed to the composition for forming an alignment layer PA2 having the following composition.

[0146] ───────────────────────────────── Composition for forming alignment layer PA2 ───────────────────────────────── 100.00 parts by mass of the following polymer PA-2 5.00 parts by weight of the acid generator PAG-1 0.005 parts by weight of the acid generator CPI-110TF Xylene 1220.00 parts by mass Methyl isobutyl ketone 122.00 parts by mass ─────────────────────────────────

[0147] Polymer PA-2 [ka]

[0148] [evaluation] Peeling evaluation The obtained laminate was cut into a size of 25 mm x 150 mm, and after the release film was peeled off, the adhesive layer side was pressure-bonded onto a glass substrate (Corning Eagle XG). Thereafter, tape was attached to the support of the laminate and then peeled off. The peeled surface of the peeled support was observed and evaluated according to the following criteria, and the results are shown in Table 2 below. AA: No roughness on peeled surface A: The peeling surface is rough B: Peel residue due to the orientation layer was observed, and the area of the peel residue relative to the area of the peeled surface was less than 5% C: Peel residue due to the orientation layer is observed, and the area of the peel residue relative to the area of the peeled surface is 5% or more

[0149] [Table 2]

[0150] From the results shown in Table 2, it was found that when the thickness from the support to the adhesive layer, excluding the thickness of the support and adhesive layer, is 5 μm or less, if the thickness of the adhesive layer is less than 5 μm, it is difficult to peel off only the support (Comparative Example 1). Furthermore, it was found that when the cinnamoyl compound used to form the alignment layer does not have a functional group with an ethylenically unsaturated double bond, it is difficult to peel off only the support (Comparative Example 2). In contrast, when the thickness from the support to the adhesive layer, excluding the thicknesses of the support and adhesive layer, is 5 μm or less, it was found that the support can be easily peeled off if the thickness of the adhesive layer is 5 to 50 μm and the alignment layer is a photoalignment layer formed using a composition for forming an alignment layer containing a cinnamoyl compound having a functional group with an ethylenically unsaturated double bond (Examples 1 to 17). [Explanation of symbols]

[0151] 1 Support 2. Alignment layer 3. Optically Absorbing Anisotropic Layer 4 Adhesive layer 5 Hardened layer 6. Layer containing polyvinyl alcohol resin 7 Surface film 8. Phase difference film 10 Laminate

Claims

1. A support, an alignment layer, a light absorption anisotropic layer, and an adhesive layer in this order; the alignment layer and the optically absorptive anisotropic layer are in contact with each other, the optically absorptive anisotropic layer is formed using a composition for forming an optically absorptive anisotropic layer, the composition containing a dichroic substance and a liquid crystalline compound; the liquid crystal compound is a low molecular weight liquid crystal compound, the dichroic substance is two or more kinds, The thickness from the support to the adhesive layer, excluding the support and the adhesive layer, is 5 μm or less; The thickness of the adhesive layer is 5 μm to 50 μm, the alignment layer is a photo-alignment layer formed using a composition for forming an alignment layer, which contains a cinnamoyl compound having a functional group with an ethylenically unsaturated double bond, A laminate, wherein the composition for forming an optically absorptive anisotropic layer and the composition for forming an alignment layer contain the same type of polymerizable group.

2. A support, an alignment layer, a light absorption anisotropic layer, and an adhesive layer in this order; the alignment layer and the optically absorptive anisotropic layer are in contact with each other, the optically absorptive anisotropic layer is formed using a composition for forming an optically absorptive anisotropic layer, the composition containing a dichroic substance and a liquid crystalline compound; the liquid crystal compound is a low molecular weight liquid crystal compound, the dichroic substance is two or more kinds, The thickness from the support to the adhesive layer, excluding the support and the adhesive layer, is 5 μm or less; The thickness of the adhesive layer is 5 μm to 50 μm, the alignment layer is a photo-alignment layer formed using a composition for forming an alignment layer, which contains a cinnamoyl compound having a functional group with an ethylenically unsaturated double bond, A laminate, wherein the composition for forming an optically absorptive anisotropic layer and the composition for forming an alignment layer each contain a methacryloyl group or an acryloyl group.

3. The laminate according to claim 1 or 2, wherein the functional group having an ethylenically unsaturated double bond is a methacryloyl group or an acryloyl group.

4. The laminate according to any one of claims 1 to 3, further comprising a layer containing a polyvinyl alcohol resin between the optically absorptive anisotropic layer and the adhesive layer.

5. The laminate according to claim 4 , wherein the layer containing the polyvinyl alcohol resin contains a polymerization initiator.

6. The laminate according to claim 4 or 5, wherein the layer containing a polyvinyl alcohol resin is a layer formed using a polyvinyl alcohol resin containing a polymerizable group in a side chain.

7. The laminate according to any one of claims 4 to 6, wherein the layer containing a polyvinyl alcohol resin is a layer formed using a polyvinyl alcohol resin containing a methacryloyl group in a side chain.

8. The laminate according to any one of claims 1 to 7, wherein the support is a cellulose-based resin or a polyester-based resin.

9. The laminate according to any one of claims 1 to 8, wherein the adhesive layer comprises an adhesive containing an acrylic polymer.

10. The laminate according to claim 9 , wherein the acrylic polymer has a weight average molecular weight of 100,000 or more.

11. The laminate according to any one of claims 1 to 10, wherein the adhesive layer has a storage modulus of 100 kPa to 20 MPa.

12. The laminate according to claim 11, wherein the adhesive layer has a storage modulus of 100 kPa to 2 MPa.

13. The laminate according to any one of claims 1 to 12, wherein the optically absorptive anisotropic layer has a thickness of 0.1 µm to 3 µm.

14. The laminate according to any one of claims 1 to 13, wherein the alignment layer has a thickness of 0.1 µm to 2 µm.

15. The laminate according to any one of claims 1 to 14, wherein the support and the alignment layer are in contact with each other.

16. The laminate according to any one of claims 1 to 15, wherein the support is peeled off.

17. The laminate according to claim 16 , further comprising a retardation film, the retardation film being disposed on the alignment layer side.

18. A film comprising a support, an alignment layer, a light absorption anisotropic layer, and an adhesive layer in this order, the alignment layer and the optically absorptive anisotropic layer are in contact with each other, the optically absorptive anisotropic layer is formed using a composition for forming an optically absorptive anisotropic layer, the composition containing a dichroic substance and a liquid crystalline compound; the liquid crystal compound is a liquid crystal compound that exhibits a smectic liquid crystal state, the dichroic substance is two or more kinds, The thickness from the support to the adhesive layer, excluding the support and the adhesive layer, is 5 μm or less; The thickness of the adhesive layer is 5 μm to 50 μm, the alignment layer is a photo-alignment layer formed using a composition for forming an alignment layer, which contains a cinnamoyl compound having a functional group with an ethylenically unsaturated double bond, A laminate, wherein the composition for forming an optically absorptive anisotropic layer and the composition for forming an alignment layer contain the same type of polymerizable group.

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

Images