TW202239584A - Light-absorbing anisotropic plate - Google Patents

Abstract

The invention relates to a light-absorbing anisotropic plate. The present invention relates to a vertically oriented light-absorbing anisotropic film which has an excellent dichroic dye diffusion prevention effect and is not susceptible to interference unevenness. A first anti-diffusion layer is laminated adjacent to one surface of the film with or without an alignment film therebetween, a second anti-diffusion layer is laminated adjacent to the other surface of the film, and the thickness of each of the first and second anti-diffusion layers is 0.05 [mu]m to 5 [mu]m (inclusive). The film is formed by curing a polymerizable liquid crystal compound and a dichroic dye in a state of being oriented in the vertical direction with respect to the plane of the film, and the refractive indexes of the first and second diffusion prevention layers and the light-absorbing anisotropic film satisfy at least one of formulae (1) and (2): n [lambda] xy ≤ n [lambda] a ≤ [lambda] z (1) and n [lambda] xy ≤ n [lambda] b ≤ n [lambda] z (2). N [lambda] represents a refractive index n of the diffusion prevention layer or the light-absorbing anisotropic film at a wavelength of 589 nm; n lambda a and n lambda b respectively represent n lambda of the first anti-diffusion layer and the second anti-diffusion layer; and n [lambda] xy and n [lambda] z respectively represent n [lambda] of the light-absorbing anisotropic film in directions parallel to and perpendicular to the film plane.

Description

Light absorption anisotropic plate

The present invention relates to a light-absorbing anisotropic plate and a manufacturing method of the above-mentioned light-absorbing anisotropic plate.

As a light-absorbing anisotropic film used to impart a privacy function to displays such as mobile phones and bank ATMs (Automated Teller Machines, automatic teller machines), it is known that a liquid crystal composition containing a dichroic dye and a liquid crystal compound is coated. A light-absorbing anisotropic film is produced by distributing on a substrate and aligning the liquid crystal compound and the dichroic dye vertically with respect to the film plane (Patent Document 1). [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2016-27387

[Problem to be solved by the invention]

It is known that in a cured liquid crystal film containing a dichroic dye, an anti-diffusion layer is provided in order to prevent the diffusion of the dichroic dye from the cured liquid crystal film. However, there are cases where interference spots are generated due to interfacial reflection at the interface between the light-absorbing anisotropic film and the diffusion prevention layer. When an anti-diffusion layer is provided on the light-absorbing anisotropic film in which the liquid crystal compound and the dichroic dye are aligned vertically with respect to the film plane, there is a problem that light aligned horizontally with the liquid crystal compound and the dichroic dye relative to the film plane Compared with the absorption anisotropic film, although the interference spots disappeared when the inclination without in-plane anisotropy degree was attempted to rotate 360°, the interference spots in the case of oblique tilting from the front were clearly visible . When the light-absorption anisotropic plate is incorporated into an image display device or the like, such interference spots may degrade the visibility thereof.

It is an object of the present invention to provide a light-absorption anisotropic plate including a vertically aligned light-absorption anisotropic film that is excellent in the anti-diffusion effect of a dichroic dye and is less likely to generate interference spots. [Technical means to solve the problem]

The inventors of the present invention conducted earnest research to solve the above-mentioned problems, and as a result, completed the present invention. That is, the present invention includes the following aspects. [1] A light-absorption anisotropic plate, which is obtained by laminating a first anti-diffusion layer adjacent to one side of the light-absorption anisotropic film with or without an alignment film, and laminating a second anti-diffusion layer adjacent to the other side. and the thicknesses of the first anti-diffusion layer and the second anti-diffusion layer are not less than 0.05 μm and not more than 5 μm, and the light-absorbing anisotropic film is a polymeric liquid crystal compound and a dichroic pigment to match the light-absorbing anisotropy The cured film obtained by hardening in the state of aligning in the direction perpendicular to the plane of the tropic film, the refractive indices of the first diffusion prevention layer, the second diffusion prevention layer and the light absorption anisotropic film satisfy formula (1) and formula (2) At least one of them: n _λxy ≦n _λa ≦n _λz (1) n _λxy ≦n _λb ≦n _λz (2) [In formula (1) and formula (2), n _λ represents the anti-diffusion layer at a wavelength of 589 nm Or the refractive index n of the light-absorbing anisotropic film, n _λa represents n _λ of the first anti-diffusion layer, n _λb represents n _λ of the second anti-diffusion layer, and n _λxy represents the film plane parallel to the light-absorbing anisotropic film The n _λ of the direction, n _λz represent the n _λ of the direction perpendicular to the film plane of the light-absorbing anisotropic film]. [2] The light-absorption anisotropic plate as described in [1] above, wherein at least one of the first diffusion prevention layer and the second diffusion prevention layer has a thickness of 0.05 μm or more and 3 μm or less. [3] The light-absorbing anisotropic sheet as described in [1] or [2] above, wherein either the first diffusion prevention layer or the second diffusion prevention layer is cured of a cationic polymerizable curable composition. Floor. [4] The light-absorbing anisotropic sheet as described in [3] above, wherein the cationically polymerizable curable composition contains an epoxy compound. [5] The light-absorbing anisotropic sheet as described in any one of [1] to [4] above, wherein either the first diffusion prevention layer or the second diffusion prevention layer is curable by radical polymerization. The hardened layer of the composition. [6] The light-absorption anisotropic sheet as described in any one of [1] to [5] above, wherein the radical polymerizable curable composition contains a polyfunctional (meth)acrylate compound. [7] The light-absorption anisotropic sheet according to any one of [1] to [6] above, wherein either one of the first diffusion prevention layer and the second diffusion prevention layer is an adhesive layer. [8] The light-absorption anisotropic plate as described in any one of [1] to [7] above, wherein the polymerizable liquid crystal compound is a liquid crystal compound exhibiting a smectic liquid crystal phase. [9] The light absorption anisotropic plate according to any one of [1] to [8] above, wherein the dichroic dye is an azo dye. [10] The light-absorption anisotropic plate as described in any one of [1] to [9] above, wherein the light-absorption anisotropic film has maximum absorption at a wavelength between 550 μm and 700 nm. [11] The light-absorption anisotropic plate according to any one of [1] to [10] above, wherein the thickness of the light-absorption anisotropic film is not less than 0.1 μm and not more than 2 μm. [12] The light-absorption anisotropic sheet as described in any one of the above-mentioned [1] to [11], wherein the light-absorption anisotropic film shows a Buhlerg peak in X-ray diffraction measurement. [13] A manufacturing method of a light-absorbing anisotropic plate in which a first anti-diffusion layer is laminated on one side of the light-absorbing anisotropic film with or without an alignment film, and a second anti-diffusion layer is layered on the other side A production method comprising the steps of: (i) forming a coating film of a liquid crystal composition comprising a polymerizable liquid crystal compound and a dichroic pigment on a first diffusion prevention layer; (ii) drying the obtained coating film to obtain a dry coating film; (iii) curing the coating film in a state where the polymerizable liquid crystal compound and the dichroic pigment are aligned in a direction perpendicular to the plane of the coating film to form a light-absorbing anisotropic film; and (iv) The surface of the formed light-absorbing anisotropic film opposite to the first diffusion prevention layer forms a second diffusion prevention layer. [14] A display material comprising the light absorption anisotropic plate as described in any one of [1] to [12] above. [15] A display device comprising the light-absorption anisotropic plate as described in any one of [1] to [12] above. [Effect of Invention]

According to the present invention, it is possible to provide a light-absorption anisotropic plate including a vertically aligned light-absorption anisotropic film which is excellent in the anti-diffusion effect of the dichroic dye and hardly causes interference spots.

Hereinafter, embodiments of the present invention will be described in detail. In addition, the scope of the present invention is not limited to the embodiment described here, and various changes can be made within the range which does not damage the gist of the present invention.

The light-absorption anisotropic plate of the present invention has diffusion prevention layers on both sides of the light-absorption anisotropy film. By having the diffusion prevention layers on both sides of the light-absorption anisotropic film, the dichroic dye contained in the light-absorption anisotropic film can be prevented from diffusing from the light-absorption anisotropic film toward other layers.

In the light-absorption anisotropic plate of the present invention, two diffusion prevention layers are respectively present close to or adjacent to the light-absorption anisotropy film. When the light-absorbing anisotropic film is close to or adjacent to the diffusion prevention layer, a high effect of preventing the diffusion of the dichroic dye can be obtained. Specifically, in the light-absorption anisotropic plate of the present invention, the first anti-diffusion layer (hereinafter referred to as "the first anti-diffusion layer") is laminated on the light-absorption anisotropic film through the alignment film, or is not formed through the alignment film. The second diffusion prevention layer (hereinafter referred to as "second diffusion prevention layer") laminated on the side opposite to the first diffusion prevention layer of the light absorption anisotropy film and the The light-absorbing anisotropic films are adjacently laminated.

In the light-absorption anisotropic plate of the present invention, each refractive index of the first diffusion prevention layer, the second diffusion prevention layer, and the light-absorption anisotropy film satisfies at least one of formula (1) and formula (2). n _λxy ≦n _λa ≦n _λz (1) n _λxy ≦n _λb ≦n _λz (2) In formula (1) and formula (2), n _λ represents the anti-diffusion layer or light absorption anisotropy at a wavelength of 589 nm Refractive index n of the film, n _λa represents n _λ of the first anti-diffusion layer, n _λb represents n _λ of the second anti-diffusion layer, n _λxy represents n _λ in the direction parallel to the film plane of the light absorption anisotropic film, n _λz represents n _λ in the direction perpendicular to the film plane of the light absorption anisotropic film.

In the light-absorbing anisotropic plate formed by sequentially laminating the first anti-diffusion layer, the light-absorbing anisotropic film, and the second anti-diffusion layer, at the interface between the first anti-diffusion layer and the light-absorbing anisotropic film, And/or the interface between the light-absorbing anisotropic film and the second anti-diffusion layer is prone to interface reflection. This kind of interface reflection j is related to interference spots, especially because the interface reflection between the first anti-diffusion layer and the light-absorbing anisotropic film interferes with the interface reflection between the second anti-diffusion layer and the light-absorbing anisotropic film , more prone to interference spots. The inventors of the present invention have found that the interface reflection at the interface between the anti-diffusion layer and the light-absorbing anisotropic film in this laminated structure is caused by the refractive index of the first anti-diffusion layer or the refractive index of the second anti-diffusion layer. Produced by the difference in refractive index from the light-absorbing anisotropic film. The light-absorbing anisotropic film constituting the light-absorbing anisotropic plate of the present invention is obtained by hardening a polymerizable liquid crystal compound and a dichroic dye in a state aligned in a direction perpendicular to the plane of the light-absorbing anisotropic film. The cured film usually has a large refractive index in the film thickness direction, and there is almost no difference in the refractive index in the film plane. Therefore, in the light-absorbing anisotropic plate of the present invention, by controlling the refractive index of the diffusion prevention layer and the refractive index of the light-absorbing anisotropic film, interference spots can be suppressed in the entire surface of the light-absorbing anisotropic film of the generation. On the other hand, in the case where the light-absorption anisotropic plate has a light-absorption anisotropy film aligned in a direction parallel to the film plane (that is, a horizontal alignment type light-absorption anisotropy film), There is a slow axis and an advanced axis in the film surface, so there is a difference in the refractive index between the adjacent diffusion prevention layer on the same surface, and it is difficult to use the difference in refractive index as an index to suppress interference spots.

Formula (1) means that the refractive index n _λa of the first anti-diffusion layer is the refractive index n λxy of the xy direction in the film plane of the light-absorbing anisotropic film, that is, the direction parallel to the film plane, and the refractive index n _λxy of the light-absorbing anisotropic film The z direction in the film plane is the range or the same value of the refractive index n _λz in the direction perpendicular to the film plane, including n _λxy <n _λa ≤ n _λz , n _λxy ≤ n _λa <n _λz , n _λxy <n _λa <n _λz , n _λxy =n _λa =n _λz . Since the relationship between the refractive index n _λa of the first anti-diffusion layer and the refractive index n _λxy and n _λz of the light-absorbing anisotropic film satisfies the formula (1), it is easy to control the refractive index and light absorption difference of the first anti-diffusion layer. The difference in the refractive index of the tropic film becomes smaller, making it difficult to generate interface reflection between the first diffusion prevention layer and the light-absorbing anisotropic film.

Similarly, formula (2) means that the refractive index n _λb of the second diffusion prevention layer is the refractive index n _λxy of the xy direction in the film plane of the light absorption anisotropic film, that is, the direction parallel to the film plane, and the light absorption anisotropy The z direction in the film plane of the film is the range or the same value of the refractive index n _λz in the direction perpendicular to the film plane, including n _λxy <n _λa ≤ n _λz , n _λxy ≤ n _λa <n _λz , n _λxy <n _λa <n _λz , n _λxy =n _λa =n _λz . Since the refractive index n _λb of the second anti-diffusion layer and the refractive index n _λxy and n _λz of the light-absorbing anisotropic film satisfy the relationship of formula (2), it is easy to control the refractive index and light absorption difference of the second anti-diffusion layer. The difference in the refractive index of the anisotropic film becomes smaller, making it difficult to generate interface reflection between the second diffusion prevention layer and the light-absorbing anisotropic film.

In the light-absorption anisotropic sheet of the present invention, at least one of formula (1) and formula (2) needs to be satisfied, preferably both of formula (1) and formula (2). By satisfying the formulas (1) and (2), it is possible to effectively suppress the interface reflection between the first anti-diffusion layer and the light-absorbing anisotropic film, and between the second anti-diffusion layer and the light-absorbing anisotropic film. The interface reflections interfere with each other and are more likely to produce interference spots.

The difference between the refractive index n _λa of the first diffusion prevention layer and the refractive index n _λxy of the light-absorbing anisotropic film, and the difference between the refractive index n _λa of the first diffusion prevention layer and the refractive index n _λz of the light-absorbing anisotropic film The smaller the value, the more the reflection at the interface between the first diffusion prevention layer and the light-absorbing anisotropic film can be suppressed, and the effect of suppressing interference spots can be improved. Therefore, the difference between the refractive index n _λa of the first diffusion prevention layer and the refractive index n _λxy of the light-absorbing anisotropic film (absolute value: |n _λa - n _λxy |) is preferably 0.12 or less, more preferably 0.10 or less, Furthermore, it is preferably 0.07 or less. The smaller the difference between the refractive index n _λa and the refractive index n _λxy , the better. From the viewpoint of suppressing interference spots, it is ideally 0, but usually 0.01 or more. Also, the difference between the refractive index n _λa of the first diffusion preventing layer and the refractive index n _λz of the light-absorbing anisotropic film (absolute value: |n _{λz -} n _λa |) is preferably 0.12 or less, more preferably 0.10 or less, Furthermore, it is more preferably 0.09 or less. The smaller the difference between the refractive index n _λa and the refractive index n _λz , the better. From the viewpoint of suppressing interference spots, it is ideally 0, but usually 0.01 or more.

Similarly, the difference between the refractive index n _λb of the second diffusion prevention layer and the refractive index n _λxy of the light-absorbing anisotropic film, and the difference between the refractive index n _λb of the second diffusion prevention layer and the refractive index n of the light-absorbing anisotropic film The smaller the difference in _λz , the more the reflection at the interface between the second diffusion prevention layer and the light-absorbing anisotropic film can be suppressed, and the effect of suppressing interference spots can be improved. Therefore, the difference between the refractive index n _λb of the second diffusion prevention layer and the refractive index n _λxy of the light-absorbing anisotropic film (absolute value: |n _λb - n _λxy |) is preferably 0.12 or less, more preferably 0.10 or less, Furthermore, it is preferably 0.07 or less. The smaller the difference between the refractive index n _λb and the refractive index n _λxy , the better. From the viewpoint of suppressing interference spots, it is ideally 0, but usually 0.01 or more. Also, the difference between the refractive index n _λb of the second diffusion preventing layer and the refractive index n _λz of the light-absorbing anisotropic film (absolute value: |n _{λz -} n _λb |) is preferably 0.12 or less, more preferably 0.10 or less, Furthermore, it is more preferably 0.09 or less. The smaller the difference between the refractive index n _λb and the refractive index n _λz , the better. From the viewpoint of suppressing interference spots, it is ideally 0, but usually 0.01 or more.

The refractive index n _λa , the refractive index n _λb , and the refractive index n _λxy are refractive indices at a wavelength of 589 nm, and can be measured using an Abbe refractometer or the like. Specifically, for example, it can be measured according to the method described in the following examples. Also, when there is an alignment film between the first diffusion prevention layer and the light-absorbing anisotropic film, it is preferable that the refractive index of the alignment film is between the refractive index n _λxy and the refractive index n _λz .

The refractive index n _λa , the refractive index n _λb , and the refractive index n _λxy , and their differences can be determined by appropriately selecting the types and compounds of the compounds constituting the first diffusion prevention layer, the second diffusion prevention layer, and the light-absorbing anisotropic film. The alignment direction, the composition of the composition, etc. are controlled. In particular, by adjusting the refractive index of the first anti-diffusion layer and the second anti-diffusion layer that do not have light-absorption anisotropy to approximate the refractive index of the light-absorption anisotropic film, it is possible to ensure Higher optical properties are required, and the interface reflection generated at the interface between the anti-diffusion layer and the light-absorbing anisotropic film is effectively suppressed.

＜Diffusion prevention layer＞ The thicknesses of the first anti-diffusion layer and the second anti-diffusion layer are 0.05 μm to 5 μm, preferably 4 μm or less, more preferably 3 μm or less, further preferably 2.5 μm or less, especially preferably 2 μm or less . Generally speaking, there is a tendency that the thinner the thickness of the first anti-diffusion layer and the second anti-diffusion layer, the interface reflection generated at the interface between the first anti-diffusion layer and the light-absorbing anisotropic film, and the second anti-diffusion layer. The easier the interfacial reflections at the interface between the layer and the light-absorbing anisotropic film interfere with each other, the easier it is to generate interference spots. Even in this case, since the light absorption anisotropic plate of the present invention controls the difference between the refractive index of the diffusion prevention layer and the refractive index of the light absorption anisotropy film, each diffusion prevention layer and the light absorption anisotropy are suppressed. Since reflection occurs at the interface of the film, even if the thicknesses of the first diffusion prevention layer and the second diffusion prevention layer are thinned, the generation of interference spots can be effectively suppressed, which is advantageous. The thickness of the first anti-diffusion layer and the thickness of the second anti-diffusion layer may be the same as or different from each other. The thickness of the anti-diffusion layer can be measured with a laser microscope or a film thickness gauge. Hereinafter, the measurement of the thickness of each layer such as the light-absorbing anisotropic film constituting the light-absorbing anisotropic plate is also the same.

In one embodiment of the present invention, the thickness of at least one of the first anti-diffusion layer and the second anti-diffusion layer is preferably not less than 0.05 μm and not more than 3 μm as a structure that can more significantly obtain the effect of suppressing interference spots. . The upper limit of the thickness of at least one of the first diffusion prevention layer and the second diffusion prevention layer is more preferably 2.5 μm or less, further preferably 2 μm or less, and may be 1.5 μm or less. Moreover, the thickness of the 1st diffusion prevention layer and the thickness of the 2nd diffusion prevention layer may be below the said upper limit.

In the present invention, the first anti-diffusion layer and the second anti-diffusion layer are layers that can satisfy the above formula (1) or formula (2) in relation to the refractive index of the light-absorbing anisotropic film, and have optical A layer that absorbs the diffusion prevention function of the dichroic pigment contained in the anisotropic film. The first anti-diffusion layer and the second anti-diffusion layer are layers provided in order to impart the anti-diffusion function of the dichroic dye in the light-absorption anisotropic film to the light-absorption anisotropic plate, for example, in anisotropic light-absorption When the non-conductive plate is assembled in a display device, etc., it will not be peeled off, and it is assembled together with the light-absorbing anisotropic film. Therefore, in the present invention, the first anti-diffusion layer and the second anti-diffusion layer are distinguished from substrates, protective films, etc. that may be peeled off when they are assembled in a display device or the like. In the present invention, the first anti-diffusion layer and the second anti-diffusion layer may be the same or different. In this specification, it may be simply referred to as a "diffusion prevention layer", but this means that the diffusion prevention layer may be either the first diffusion prevention layer or the second diffusion prevention layer.

The anti-diffusion layer is not particularly limited as long as it satisfies the above-mentioned formula (1) or formula (2) in relation to the refractive index of the light-absorbing anisotropic film and has the anti-diffusion function of the dichroic dye. For example, a layer formed of a resin composition containing a water-soluble polymer, a layer formed of a curable composition containing an active energy ray-curable resin, and the like may be mentioned.

Since the polarity of the water-soluble polymer is very different from that of the dichroic pigment, it can hinder the diffusion of the dichroic pigment. Examples of water-soluble polymers that can form the diffusion prevention layer include polyacrylamide-based polymers, polyvinyl alcohol, and ethylene-vinyl alcohol copolymers, (meth)acrylic acid or its anhydride-vinyl alcohol copolymers Such as vinyl alcohol polymers; carboxyvinyl polymers; polyvinylpyrrolidone; starches; sodium alginate; or polyethylene oxide polymers, etc. These polymers may be used alone or in combination of two or more.

In the case where the diffusion prevention layer is a layer formed of a resin composition containing a water-soluble polymer (hereinafter also referred to as "resin composition containing a water-soluble polymer"), the content of the water-soluble polymer in the layer is relatively small. It is preferably at least 75% by mass, more preferably at least 80% by mass, and still more preferably at least 85% by mass.

When the anti-diffusion layer is a layer formed of a resin composition containing a water-soluble polymer, in order to improve the compactness of the layer and improve the anti-diffusion function of the dichroic pigment, a cross-linking agent can be introduced by using a cross-linking agent. joint structure. As such a cross-linking agent, for example, in addition to water-soluble additives or cross-linking agents such as glyoxylate and other ion-bonding cross-linking agents or epoxy-based cross-linking agents, it is also possible to use isocyanate-based cross-linking agents for the purpose of imparting water resistance. Hydrophobic crosslinking agents such as polyaldehyde-based crosslinking agents such as glyoxal or glyoxal derivatives, and metal compound-based crosslinking agents such as zirconium chloride or titanium lactate.

When a crosslinking agent is used to introduce a crosslinked structure into the diffusion prevention layer, the amount to be added may be appropriately determined according to the type of crosslinking agent used and the like. For example, it may be 0.1-100 mass parts with respect to 100 mass parts of water-soluble polymers, Preferably it is 1-50 mass parts, More preferably, it is 10-30 mass parts. When the content of the crosslinking agent is within the above-mentioned range, the diffusion prevention layer becomes dense, and the shielding effect on the dichroic dye in the light-absorbing anisotropic film is easily enhanced.

The water-soluble polymer-containing resin composition capable of forming a diffusion prevention layer is usually prepared in the form of a solution in which a water-soluble polymer is dissolved in a solvent. The solvent can be selected according to the water-soluble polymer used, and typically, water, alcohol, a mixture of water and alcohol, etc. are mentioned, and water is preferred.

The solid content concentration of the water-soluble polymer-containing resin composition obtained by adding a solvent to the components constituting the diffusion prevention layer such as a water-soluble polymer or a crosslinking agent is preferably 2 to 50% by mass, more preferably 5-30 mass %, More preferably, it is 5-15 mass %. When the solid content concentration of the water-soluble polymer-containing resin composition is within the above-mentioned range, the viscosity of the composition is lowered, so that applicability or workability is good. In addition, the "solid content" mentioned here refers to a component obtained by removing a solvent such as water from a resin composition containing a water-soluble polymer. A component obtained by removing volatile components such as solvents from the target composition.

The resin composition containing a water-soluble polymer may contain other components such as additives in addition to solvents such as a water-soluble polymer, a crosslinking agent, and water. As such another component, a preservative, a leveling agent, etc. are mentioned, for example. When the water-soluble polymer-containing resin composition contains other components such as additives, the amount thereof is preferably 10% by mass or less, more preferably 5% by mass or less, based on the solid content of the resin composition.

For example, the antidiffusion layer can be obtained by coating a resin composition containing a water-soluble polymer on the surface on which the antidiffusion layer is to be formed, and drying and curing the coating film.

The method of coating the resin composition containing the water-soluble polymer is not particularly limited, and examples thereof include spin coating, extrusion, gravure coating, die coating, and bar coating. Coating methods such as the , dressing method, etc.; printing methods such as the flexographic method and other known methods.

The drying temperature and time for forming the diffusion prevention layer from the coating film of the water-soluble polymer-containing resin composition are not particularly limited, and may be appropriately determined according to the composition, etc., of the water-soluble polymer-containing resin composition to be used. . The drying treatment can be carried out, for example, by blowing hot air, etc., and its temperature is usually 40-100°C, preferably within the range of 60-100°C. In addition, the drying time is usually 10 to 600 seconds.

Since the active energy ray-curable resin can be highly polymerized, it tends to be excellent in the anti-diffusion function of the dichroic dye. Examples of curable compositions containing active energy ray-curable resins capable of forming a diffusion preventing layer (hereinafter also referred to as "curable compositions for forming a diffusion preventing layer") include cationically polymerizable compounds as curable compounds. A cationically polymerizable curable composition, a radically polymerizable curable composition comprising a radically polymerizable compound as a curable compound, a mixed type curable compound comprising both a cationically polymerizable compound and a radically polymerizable compound composition etc. Specific examples of cationic polymerizable compounds include epoxy compounds having one or more epoxy groups in the molecule, oxetane compounds having one or more oxetane rings in the molecule, and vinyl compounds. Wait. Moreover, specific examples of the radically polymerizable compound include (meth)acrylic compounds and vinyl compounds having one or more (meth)acryl groups in the molecule. The curable composition for forming a diffusion preventing layer may contain 1 type, or 2 or more types of cation polymerizable compounds, and/or may contain 1 type, or 2 or more types of radically polymerizable compounds.

The cationically polymerizable compound as the main component of the cationically polymerizable curable composition refers to a compound or oligomer that is hardened by cationic polymerization by irradiation or heating of active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. , epoxy compounds, oxetane compounds, vinyl compounds, etc. can be illustrated. Among them, preferred cationically polymerizable compounds are epoxy compounds.

The term "epoxy compound" refers to a compound having one or more, preferably two or more epoxy groups in the molecule. An epoxy compound may be used individually by 1 type, and may use 2 or more types together. As an epoxy compound, an alicyclic epoxy compound, an aromatic epoxy compound, a hydrogenated epoxy compound, an aliphatic epoxy compound, etc. are mentioned. Among them, the epoxy compound preferably includes an alicyclic epoxy compound or an aliphatic epoxy compound from the viewpoints of weather resistance, curing speed, and adhesiveness.

The alicyclic epoxy compound is a compound having one or more epoxy groups bonded to an alicyclic ring in the molecule. The "epoxy group bonded to an alicyclic ring" means a bridging oxygen atom -O- in the structure represented by the following formula (i). In the following formula (i), m is an integer of 2-5.

[chemical 1]

The compound in which one or more hydrogen atoms in (CH ₂ ) _m in the above formula (i) are removed and bonded to other chemical structures can be an alicyclic epoxy compound. One or more hydrogen atoms in (CH ₂ ) _m may be suitably substituted with linear alkyl groups such as methyl or ethyl.

Among them, esters having an epoxycyclopentane structure [in the above formula (i), m=3] or an epoxycyclohexane structure [in the above formula (i), m=4] are preferred. Cyclic epoxy compounds. As the alicyclic epoxy compound, specifically, for example, 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methyl cyclohexyl 3,4-epoxy-6-methylcyclohexylmethyl hexylcarboxylate, ethylidene bis(3,4-epoxycyclohexylcarboxylate), bis(3,4-epoxycyclohexylmethyl) Adipate, bis(3,4-epoxy-6-methylcyclohexylmethyl)adipate, diethylene glycol bis(3,4-epoxycyclohexylmethyl ether), ethylene glycol Bis(3,4-epoxycyclohexyl methyl ether), 2,3,14,15-diepoxy-7,11,18,21-tetraoxatrispiro[5.2.2.5.2.2]20 One alkane, 3-(3,4-epoxycyclohexyl)-8,9-epoxy-1,5-dioxaspiro[5.5]undecane, 4-vinylcyclohexene dioxide, di Limonene oxide, bis(2,3-epoxycyclopentyl) ether, dicyclopentadiene dioxide, etc.

The aromatic epoxy compound is a compound having an aromatic ring and an epoxy group in the molecule. Specific examples thereof include: bisphenol-type epoxy compounds such as diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, and diglycidyl ether of bisphenol S or their oligomers; Novolac epoxy resins, cresol novolac epoxy resins, hydroxybenzaldehyde phenolic novolak epoxy resins and other novolac epoxy resins; glycidol of 2,2',4,4'-tetrahydroxydiphenylmethane Ether, glycidyl ether of 2,2',4,4'-tetrahydroxybenzophenone and other multifunctional epoxy compounds; epoxidized polyvinylphenol and other multifunctional epoxy resins, etc.

Hydrogenated epoxy compounds are glycidyl ethers of polyhydric alcohols with alicyclic rings, which can be obtained by glycidyl etherification of nuclear hydrogenated polyols by adding aromatic polyols to It is obtained by selectively hydrogenating aromatic rings under pressure in the presence of a catalyst. Specific examples of aromatic polyols include, for example, bisphenol-type compounds such as bisphenol A, bisphenol F, and bisphenol S; Resin; polyfunctional compounds such as tetrahydroxydiphenylmethane, tetrahydroxybenzophenone, polyvinylphenol, etc. The alicyclic polyol is obtained by hydrogenating the aromatic ring of the aromatic polyol, and the alicyclic polyol is reacted with epichlorohydrin to produce glycidyl ether. Preferred among the hydrogenated epoxy compounds is hydrogenated diglycidyl ether of bisphenol A.

The aliphatic epoxy compound is a compound having at least one oxirane ring (three-membered cyclic ether) bonded to an aliphatic carbon atom in the molecule. For example: butyl glycidyl ether, 2-ethylhexyl glycidyl ether and other monofunctional epoxy compounds; 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, neopentyl Bifunctional epoxy compounds such as diol diglycidyl ether; trimethylolpropane triglycidyl ether, pentaerythritol tetraglycidyl ether and other functional epoxy compounds; 4-vinylcyclohexene dioxide, dioxide Epoxy compounds such as limonene and the like which have one epoxy group directly bonded to an alicyclic ring and an oxirane ring bonded to an aliphatic carbon atom. Among them, bifunctional epoxy compounds (also referred to as aliphatic diepoxy compounds) having two oxirane rings bonded to aliphatic carbon atoms in the molecule are preferred. This suitable aliphatic diepoxy compound can be represented by following formula (ii), for example.

[Chem 2]

Y in the above formula (ii) is an alkylene group with 2 to 9 carbons, an alkylene group with 4 to 9 total carbons intervening ether bonds, or a divalent group with 6 to 18 carbons having an alicyclic structure. Hydrocarbyl.

Specifically, the aliphatic diepoxy compound represented by the above formula (ii) is a diglycidyl ether of an alkanediol, a diglycidyl ether of an oligoalkylene glycol with a repeat number of up to about 4, or an ester Diglycidyl ether of cyclic diol.

Regarding the specific example of the glycol (glycol) that can form the aliphatic diepoxide represented by the above formula (ii), Examples of alkanediol include ethylene glycol, propylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, 1, 4-butanediol, neopentyl glycol, 3-methyl-2,4-pentanediol, 2,4-pentanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol Diol, 2-methyl-2,4-pentanediol, 2,4-diethyl-1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 3, 5-heptanediol, 1,8-octanediol, 2-methyl-1,8-octanediol, 1,9-nonanediol, etc.; As the oligoalkylene glycol, for example: diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, etc.; As alicyclic diol, cyclohexanediol, cyclohexanedimethanol, etc. are mentioned.

An oxetane compound, one of cationic polymerizable compounds, is a compound containing one or more oxetane rings (oxetanyl) in the molecule, and specific examples include 3-ethyl-3-hydroxy Methyloxetane (also known as oxetanol), 2-ethylhexyloxetane, 1,4-bis[{(3-ethyloxetane-3- yl)methoxy}methyl]benzene (also known as xylylenedioxetane), 3-ethyl-3[{(3-ethyloxetan-3-yl)methyl Oxy}methyl]oxetane, 3-ethyl-3-(phenoxymethyl)oxetane, 3-(cyclohexyloxy)methyl-3-ethyloxetane butane. The oxetane compound can be used as the main component of the cationically polymerizable compound, and can also be used in combination with an epoxy compound. By using an oxetane compound together, the hardening speed and adhesiveness of the curable composition for diffusion prevention layer formation can be improved.

As a vinyl compound which can become a cationically polymerizable compound, an aliphatic or alicyclic vinyl ether compound is mentioned. Specific examples thereof include, for example, n-pentyl vinyl ether, isopentyl vinyl ether, n-hexyl vinyl ether, n-octyl vinyl ether, 2-ethylhexyl vinyl ether, n-dodecyl vinyl ether, Stearyl vinyl ether, oleyl vinyl ether and other vinyl ethers of alkyl or alkenyl alcohols with 5 to 20 carbon atoms; 2-hydroxyethyl vinyl ether, 3-hydroxypropyl vinyl ether, 4- Hydroxybutyl vinyl ether and other vinyl ethers containing hydroxyl groups; cyclohexyl vinyl ether, 2-methylcyclohexyl vinyl ether, cyclohexyl methyl vinyl ether, benzyl vinyl ether, etc. have aliphatic ring or aromatic Vinyl ethers of acyclic monoalcohols; glycerol monovinyl ether, 1,4-butanediol monovinyl ether, 1,4-butanediol divinyl ether, 1,6-hexanediol divinyl ether ether, neopentyl glycol divinyl ether, pentaerythritol divinyl ether, pentaerythritol tetravinyl ether, trimethylolpropane divinyl ether, trimethylolpropane trivinyl ether, 1,4-dihydroxycyclic Hexane monovinyl ether, 1,4-dihydroxycyclohexane divinyl ether, 1,4-dimethylolcyclohexane monovinyl ether, 1,4-dimethylolcyclohexane divinyl ether Mono-polyvinyl ethers of polyalcohols such as diethylene glycol divinyl ether, triethylene glycol divinyl ether, diethylene glycol monobutyl monovinyl ether, etc. or divinyl ether; glycidyl vinyl ether, glycol vinyl ether methacrylate and other vinyl ethers. The vinyl compound can be used as the main component of the cationically polymerizable compound, and can also be used in combination with an epoxy compound, or an epoxy compound and an oxetane compound. By using the vinyl compound in combination, the hardening speed of the curable composition for forming a diffusion prevention layer can be increased or the viscosity can be reduced.

The cationic polymerizable curable composition may also contain other cationic polymerizable compounds such as cyclic lactone compounds, cyclic acetal compounds, cyclic thioether compounds, and spiroorthoester compounds.

In one embodiment of the present invention, when the curable composition for forming a diffusion prevention layer contains a cationically polymerizable compound, it is preferable to include an epoxy compound as the cationically polymerizable compound. In this case, the content of the epoxy compound is preferably at least 10 parts by mass, more preferably at least 15 parts by mass, further preferably at least 20 parts by mass, with respect to 100 parts by mass of the solid content of the curable composition, and Preferably it is 70 mass parts or less, More preferably, it is 60 mass parts or less, More preferably, it is 50 mass parts or less.

When the total amount of the curable compound contained in the curable composition for forming a diffusion prevention layer containing a cationically polymerizable compound (including the mixed type) is set to 100% by mass, the content of the cationically polymerizable compound (including 2 In the case of two or more kinds of cationically polymerizable compounds, the total content thereof) is preferably 50% by mass or more, more preferably 60% by mass or more, still more preferably 70% by mass or more. Moreover, the curable composition of cationic polymerization type may further contain a polymer component (thermoplastic resin etc.).

When the curable composition for diffusion prevention layer formation contains a cationically polymerizable compound, it is preferable to contain a photocationic polymerization initiator. Photocationic polymerization initiators are those that generate cationic species or Lewis acids by irradiation of active energy rays such as visible light, ultraviolet rays, X-rays, or electron beams, thereby initiating the polymerization of cationic hardening compounds. Since the photocationic polymerization initiator functions as a catalyst by light, it is excellent in storage stability and workability even if it is mixed in a photocation curable compound. Examples of compounds that generate cationic species or Lewis acids by irradiation with active energy rays include onium salts such as aromatic iodonium salts and aromatic permeate salts, aromatic diazonium salts, iron-aromatic complexes, and the like. .

The aromatic iodonium salt is a compound having a diaryliodonium cation, and the cation typically includes a diphenyliodonium cation. Aromatic percited salts are compounds having triaryl percited cations, and typically examples of the cations include triphenyl percited cations, 4,4'-bis(diphenyl percited) diphenyl sulfide cations, and the like. An aromatic diazonium salt is a compound which has a diazonium cation, As this cation, a benzene diazonium cation is mentioned typically. In addition, the iron-aromatic hydrocarbon complex is typically cyclopentadienyl iron (II) aromatic hydrocarbon cation complex salt.

The cations shown above are paired with anions to form photocationic polymerization initiators. Examples of anions that constitute photocationic polymerization initiators include special phosphorus anions [(Rf) _n PF _6-n ] ^- , hexafluorophosphate anions PF ₆ ^- , hexafluoroantimonate anions SbF ₆ ^- , pentafluorohydroxyantimonate anion SbF ₅ (OH) ^- , hexafluoroarsenate anion AsF ₆ ^- , tetrafluoroborate anion BF ₄ ^- , tetrakis(pentafluorophenyl) borate anion B(C ₆ F ₅ ) ₄ ^- wait. Among them, the special phosphorus-based anion [(Rf) _n PF _6-n ] ^- , the hexafluorophosphate anion PF ₆ ^- .

A photocationic polymerization initiator may use only 1 type individually, and may use 2 or more types together. Among them, aromatic cobaltium salts are preferably used because they also have ultraviolet absorption characteristics in the wavelength region around 300 nm, and therefore can provide cured products that are excellent in curability and have good mechanical strength or adhesive strength.

The content of the photocationic polymerization initiator in the curable composition for preventing diffusion layer formation is preferably 1 to 10 parts by mass, more preferably 2 to 8 parts by mass, based on 100 parts by mass of solid content of the curable compound. share. When the content of the photocationic polymerization initiator is within the above range, the cationically polymerizable compound can be fully cured, and high mechanical strength or adhesive strength can be imparted to the obtained diffusion prevention layer.

By making the cationically polymerizable curable composition contain a radically polymerizable compound in addition to the cationically polymerizable compound, a hybrid type curable composition can also be produced. By using the radically polymerizable compound in combination, the effect of improving the hardness and mechanical strength of the diffusion prevention layer can be expected, and furthermore, the viscosity and curing speed of the curable composition can be adjusted more easily.

The radical polymerizable compound which is the main component of the radical polymerizable curable composition refers to a compound that is hardened by radical polymerization reaction by irradiation or heating of active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays, or As an oligomer, the compound which has an ethylenically unsaturated bond is mentioned specifically. Examples of compounds having an ethylenically unsaturated bond include styrene, styrenesulfonic acid, vinyl acetate, Vinyl compounds such as vinyl propionate and N-vinyl-2-pyrrolidone. Among them, preferable radical polymerizable compounds are (meth)acrylic compounds.

A (meth)acrylic compound is a compound having at least one (meth)acryloxy group in its molecule, and may be a monomer, oligomer or polymer. As (meth)acrylic compounds, for example, (meth)acrylate compounds such as monofunctional (meth)acrylate compounds and polyfunctional (meth)acrylate compounds; polyfunctional urethane (meth)acrylate compounds; urethane (meth)acrylate compounds such as acrylate compounds; epoxy (meth)acrylate compounds such as polyfunctional epoxy (meth)acrylate compounds; carboxyl-modified epoxy (meth)acrylate compounds Acrylate compounds, polyester (meth)acrylate compounds, and the like. A (meth)acrylic compound may be used individually by 1 type, and may use 2 or more types together. In this specification, "(meth)acrylate" means "acrylate" or "methacrylate", and "(meth)acryl" similarly means "acryl" or " Methacryl".

Examples of (meth)acrylate compounds include monofunctional (meth)acrylate compounds having one (meth)acryloxy group in the molecule, and monofunctional (meth)acrylate compounds having two or more (meth)acryloxy groups in the molecule. A multifunctional (meth)acrylate compound.

Examples of monofunctional (meth)acrylate monomers include alkyl (meth)acrylates. In the alkyl (meth)acrylate, when the carbon number of the alkyl group is 3 or more, it may be a straight chain or a branched chain. Specific examples of alkyl (meth)acrylates include: methyl (meth)acrylate, ethyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate ester, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, etc. Aralkyl (meth)acrylates such as benzyl (meth)acrylate; (meth)acrylates of terpene alcohols such as iso(meth)acrylate; tetrahydrofuran (meth)acrylate can also be used. (Meth)acrylates with tetrahydrofurylmethyl structure such as methyl esters; cyclohexyl (meth)acrylate, cyclohexylmethyl methacrylate, dicyclopentyl acrylate, dicyclopentenyl (meth)acrylate , 1,4-cyclohexanedimethanol monoacrylate and other (meth)acrylates with cycloalkyl groups in the alkyl part; (meth)acrylic acid N,N-dimethylaminoethyl ester and other (methyl) Aminoalkyl Acrylates; 2-Phenoxyethyl (Meth)acrylate, Dicyclopentenyloxyethyl (Meth)acrylate, Ethyl Carbitol (Meth)acrylate, Phenoxypoly A (meth)acrylate having an ether bond at an alkyl portion such as ethylene glycol (meth)acrylate is used as a monofunctional (meth)acrylate monomer.

Examples of bifunctional (meth)acrylate monomers include ethylene glycol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, and 1,4-butanediol Di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, etc. Alkylene glycol di(meth)acrylate; diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate Polyoxyalkylene diacrylates such as (meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, and polytetramethylene glycol di(meth)acrylate Alcohol di(meth)acrylates; Di(meth)acrylates of halogen-substituted alkylene glycols such as tetrafluoroethylene glycol di(meth)acrylates; Trimethylolpropane di(meth)acrylates Di(meth)acrylates of aliphatic polyols such as acrylates, di-trimethylolpropane di(meth)acrylate, pentaerythritol di(meth)acrylate; dicyclopentanyl di(meth)acrylate hydrogenated Dienyl esters, tricyclodecanedimethanol di(meth)acrylates and other di(meth)acrylates of hydrogenated dicyclopentadiene or tricyclodecanedialkonol; 1,3-dioxane- 2,5-diyl di(meth)acrylate [another name: di(meth)acrylate] and other di(meth)acrylates of di(o)anediol or di((meth))acrylate ; bisphenol A ethylene oxide adduct diacrylate, bisphenol F ethylene oxide adduct diacrylate and other bisphenol A or bisphenol F alkylene oxide adducts two (methyl ) acrylates; epoxy di(meth)acrylates of bisphenol A or bisphenol F such as acrylic acid adducts of bisphenol A diglycidyl ether and acrylic acid adducts of bisphenol F diglycidyl ether; two ( Silicone meth)acrylate; Di(meth)acrylate of neopentyl glycol hydroxypivalate; 2,2-bis[4-(meth)acryloxyethoxyethoxyphenyl ]propane; 2,2-bis[4-(meth)acryloxyethoxyethoxyethoxycyclohexyl]propane; 2-(2-hydroxy-1,1-dimethylethyl)-5- Ethyl-5-hydroxymethyl-1,3-dioxane] di(meth)acrylate; tri(hydroxyethyl)isocyanurate di(meth)acrylate, etc.

A trifunctional (meth)acrylate monomer is a monomer having three (meth)acryloxy groups in the molecule, examples thereof include glycerol tri(meth)acrylate, trimethylolpropane Tri(meth)acrylate, di-trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, reaction product of pentaerythritol tri(meth)acrylate and acid anhydride, caprolactone modification Trimethylolpropane tri(meth)acrylate, caprolactone modified pentaerythritol tri(meth)acrylate, ethylene oxide modified trimethylolpropane tri(meth)acrylate, ethylene oxide Alkane modified pentaerythritol tri(meth)acrylate, propylene oxide modified trimethylolpropane tri(meth)acrylate, propylene oxide modified pentaerythritol tri(meth)acrylate, isocyanurate tri(meth)acrylate (Meth)acrylate, reactant of caprolactone modified pentaerythritol tri(meth)acrylate and acid anhydride, reactant of ethylene oxide modified pentaerythritol tri(meth)acrylate and acid anhydride, propylene oxide modified Reactant of pentaerythritol tri(meth)acrylate and acid anhydride, etc.

A 4-functional (meth)acrylate monomer is a monomer having 4 (meth)acryloxy groups in the molecule, as an example, di-trimethylolpropane tetra(meth)acrylate , Pentaerythritol tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, tripentaerythritol tetra(meth)acrylate, caprolactone modified pentaerythritol tetra(meth)acrylate, caprolactone modified three Pentaerythritol tetra(meth)acrylate, ethylene oxide modified pentaerythritol tetra(meth)acrylate, ethylene oxide modified tripentaerythritol tetra(meth)acrylate, propylene oxide modified pentaerythritol tetra(meth)acrylate ) acrylate, propylene oxide modified tripentaerythritol tetra(meth)acrylate, etc.

Examples of pentafunctional (meth)acrylate monomers include: dipentaerythritol penta(meth)acrylate, tripentaerythritol penta(meth)acrylate, reaction of dipentaerythritol penta(meth)acrylate and acid anhydride Compounds, caprolactone modified dipentaerythritol penta(meth)acrylate, caprolactone modified tripentaerythritol penta(meth)acrylate, ethylene oxide modified dipentaerythritol penta(meth)acrylate, epoxy Ethane modified tripentaerythritol penta(meth)acrylate, propylene oxide modified dipentaerythritol penta(meth)acrylate, propylene oxide modified tripentaerythritol penta(meth)acrylate, caprolactone modified di Reactant of pentaerythritol penta(meth)acrylate and acid anhydride, reactant of ethylene oxide modified dipentaerythritol penta(meth)acrylate and acid anhydride, propylene oxide modified dipentaerythritol penta(meth)acrylate and Reactants of acid anhydrides, etc.

Examples of the hexafunctional (meth)acrylate monomer include: dipentaerythritol hexa(meth)acrylate, tripentaerythritol hexa(meth)acrylate, caprolactone-modified dipentaerythritol hexa(meth)acrylate Ester, caprolactone modified tripentaerythritol hexa(meth)acrylate, ethylene oxide modified dipentaerythritol hexa(meth)acrylate, ethylene oxide modified tripentaerythritol hexa(meth)acrylate, cyclo Propylene oxide-modified dipentaerythritol hexa(meth)acrylate, propylene oxide-modified tripentaerythritol hexa(meth)acrylate, and the like.

Examples of the seven-functional (meth)acrylate monomer include: tripentaerythritol hepta(meth)acrylate, a reaction product of tripentaerythritol hepta(meth)acrylate and an acid anhydride, caprolactone-modified tripentaerythritol hepta(meth)acrylate, (Meth)acrylate, reactant of caprolactone modified tripentaerythritol hepta(meth)acrylate and acid anhydride, ethylene oxide modified tripentaerythritol hepta(meth)acrylate, ethylene oxide modified three Reactant of pentaerythritol hepta(meth)acrylate and acid anhydride, propylene oxide modified tripentaerythritol hepta(meth)acrylate, reaction product of propylene oxide modified tripentaerythritol hepta(meth)acrylate and acid anhydride, etc.

The 8-functional (meth)acrylate monomer is a monomer having 8 (meth)acryloxy groups in the molecule. As an example, it can be exemplified: tripentaerythritol octa(meth)acrylate, caprolactone modified Tripentaerythritol octa(meth)acrylate, ethylene oxide modified tripentaerythritol octa(meth)acrylate, propylene oxide modified tripentaerythritol octa(meth)acrylate, etc.

In the case of using a multifunctional (meth)acrylate compound, the crosslinking density of the diffusion prevention layer can be adjusted by controlling the molecular weight between crosslinking points and the number of crosslinking points of the compound. More specifically, the smaller the molecular weight between the crosslinking points, the higher the crosslinking density, and the more the number of crosslinking points, the denser the crosslinking density, and the higher the dichroism in the light-absorbing anisotropic film. The masking properties of sex pigments.

In general, urethane (meth)acrylate compounds refer to reactants of isocyanate compounds, polyol compounds and (meth)acrylate compounds, preferably having more than 2 (meth)acrylate compounds in the molecule. Acryloxy polyfunctional urethane (meth)acrylate compound. Since the polyfunctional urethane (meth)acrylate compound can form a crosslinked structure, it is advantageous from the viewpoint of improving the dichroic dye diffusion preventing function of the diffusion preventing layer, and can impart appropriate toughness. Therefore, the flexibility of the light-absorption anisotropic sheet may be improved, and resistance to deformation due to bending or the like may be improved. The number of functional groups of the polyfunctional urethane (meth)acrylate compound is preferably 2-5.

The epoxy (meth)acrylate compound can be obtained, for example, by addition reaction of polyglycidyl ether and (meth)acrylic acid, and one having at least two (meth)acryloxy groups in the molecule can be mentioned. Multifunctional epoxy (meth)acrylate, etc. As a polyester (meth)acrylate compound, the compound which has an ester bond and at least 2 (meth)acryloyl groups (typically (meth)acryloyloxy group) in a molecule|numerator, for example is mentioned.

In one embodiment of the present invention, when the curable composition for forming a diffusion prevention layer contains a radically polymerizable compound, it is preferable to include a polyfunctional (meth)acrylate compound as the radically polymerizable compound. In this case, the content of the polyfunctional (meth)acrylate compound is preferably at least 50 parts by mass, more preferably at least 60 parts by mass, and still more preferably at least 100 parts by mass of the solid content of the curable composition. 70 mass parts or more, Preferably it is 100 mass parts or less, More preferably, it is 95 mass parts or less, More preferably, it is 90 mass parts or less.

Also, in one embodiment of the present invention, when the curable composition for forming a diffusion prevention layer contains a radically polymerizable compound, it is preferable to include a polyfunctional (meth)acrylate compound and a polyfunctional amine group. A formate (meth)acrylate compound is used as a radically polymerizable compound. In this case, it is preferable to use the ratio (polyfunctional (meth)acrylate compound: urethane (meth)acrylic acid ester (formate base) acrylate compound, mass ratio) includes polyfunctional (meth)acrylate compound and urethane (meth)acrylate compound.

When the curable composition for diffusion prevention layer formation contains a radical polymerizable compound, it is preferable to contain a photoradical polymerization initiator. The photoradical polymerization initiator is one that initiates the polymerization reaction of a radical hardening compound by irradiation of active energy rays such as visible light, ultraviolet rays, X-rays, or electron beams. A photoradical polymerization initiator may be used individually by 1 type, and may use 2 or more types together.

等9-氧硫𠮿

系起始劑；雙(2,4,6-三甲基苯甲醯)-苯基氧化膦等醯基氧化膦系起始劑；其他之𠮿酮、茀酮、樟腦醌、苯甲醛、蒽醌等。Specific examples of photoradical polymerization initiators include: acetophenone, 3-methylacetophenone, benzoyl dimethyl ketal, 1-(4-isopropylphenyl)-2- Hydroxy-2-methylpropan-1-one, 2-methyl-1-[4-(methylthio)phenyl]-2-𠰌linylpropan-1-one and 2-hydroxy-2-methyl -Acetophenone-based initiators such as 1-phenylpropan-1-one; benzophenone-based initiators such as benzophenone, 4-chlorobenzophenone, and 4,4'-diaminobenzophenone Initiator; 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone and other benzone-based initiators; benzoin propyl ether and Benzoin ether and other benzoin ether-based initiators; 4-isopropyl 9-oxosulfur 𠮿

9-oxosulfur

It is an initiator; bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide and other acyl phosphine oxides are initiators; other ketone, ketone, camphorquinone, benzaldehyde, anthracene quinone etc.

The content of the photoradical polymerization initiator in the curable composition for preventing diffusion layer formation is preferably 1 to 10 parts by mass, more preferably 2 to 8 parts by mass relative to 100 parts by mass of solid content of the curable compound. parts by mass. When the content of the radical photopolymerization initiator is within the above range, the ability to initiate polymerization is sufficiently exhibited, the curability is improved, and the radical photopolymerization initiator is less likely to remain, so it is easy to suppress a decrease in visible light transmittance.

In the present invention, the curable composition for forming a diffusion prevention layer may contain, for example, an organic solvent in order to adjust the viscosity to be suitable for the coating method to be used, and may substantially not contain a solvent (solvent-free). In addition, "substantially not containing" means that the case where a solvent is inevitably mixed is not excluded.

As the solvent, as long as it can dissolve the components constituting the diffusion prevention layer, for example, aliphatic hydrocarbons such as hexane and octane; aromatic hydrocarbons such as toluene and xylene; ethanol, 1-propanol, isopropanol, 1-butanol and other alcohols; methyl ethyl ketone, methyl isobutyl ketone and other ketones; ethyl acetate, butyl acetate, isobutyl acetate and other esters; ethylene glycol monomethyl ether, ethylene glycol Monoethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether and other glycol ethers; ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate and other esterified glycol ethers, etc. Choose and use appropriately. These solvents may be used alone or in combination of two or more.

The type and content of the solvent are appropriately selected according to the type or content of the components constituting the diffusion prevention layer, shape, coating method, thickness of the diffusion prevention layer, and the like. When a solvent is included, for example, the amount is preferably 3 to 1,000 parts by mass, more preferably 5 to 100 parts by mass, and still more preferably 7 to 50 parts by mass, based on 100 parts by mass of the solid content of the curable composition. share.

The curable composition for forming a diffusion prevention layer may contain cationic polymerization accelerators, photosensitizers, ion scavengers, antioxidants, chain transfer agents, adhesion imparting agents, thermoplastic resins, fillers, flow regulators, plasticizers, disinfectants, etc. Foaming agent, antistatic agent, leveling agent and other additives.

For example, the diffusion prevention layer can be obtained by applying a curable composition for forming a diffusion prevention layer on the surface on which the diffusion prevention layer is to be formed, irradiating the coating film with active energy rays, and curing the composition. As a method of coating the hardening composition for diffusion prevention layer formation, the method similar to the method of coating the resin composition containing a water-soluble polymer is mentioned.

The active energy ray is appropriately selected according to the type of the polymerizable component, the type of the polymerization initiator, the amount thereof, and the like. Specific examples thereof include visible light, ultraviolet light, infrared light, X-rays, α-rays, β-rays, and γ-rays. Among them, ultraviolet light is preferable in terms of being easy to control the progress of the polymerization reaction, or being able to use a photopolymerization device widely used in the art.

Examples of light sources for active energy rays include: low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, xenon lamps, halogen lamps, carbon arc lamps, tungsten filament lamps, gallium lamps, excimer lasers, and emission wavelengths. LED (Light Emitting Diode, Light Emitting Diode) light source with a range of 380-440 nm, chemical lamps, black light lamps, microwave-excited mercury lamps, metal halide lamps, etc.

The intensity of ultraviolet irradiation is appropriately determined by the composition of the curable composition for forming a diffusion preventing layer, and is not particularly limited, but is usually 10 to 3,000 mW/cm ² . The intensity of ultraviolet irradiation is preferably an intensity in a wavelength region effective for activation of a polymerization initiator. The time for irradiating light is usually 0.1 second to 10 minutes, preferably 1 second to 5 minutes, more preferably 5 seconds to 3 minutes, and still more preferably 10 seconds to 1 minute. When irradiated once or multiple times at such an intensity of ultraviolet radiation, the cumulative light intensity is 10-3,000 mJ/cm ² , preferably 50-2,000 mJ/cm ² , more preferably 100-1,000 mJ/cm ² .

In one embodiment of the present invention, it is preferable that at least one of the first diffusion prevention layer and the second diffusion prevention layer is a cured layer of a cationically polymerized curable composition. Also, in another embodiment of the present invention, it is preferable that at least one of the first diffusion prevention layer and the second diffusion prevention layer is a cured layer of a radically polymerizable curable composition.

In another embodiment of the present invention, it is preferable that either one of the first anti-diffusion layer and the second anti-diffusion layer is a cured layer of a cationic polymerized curable composition, and the other is a radical polymerized Hardened layer of curable composition. When the first anti-diffusion layer is laminated with an alignment film and an anisotropic light-absorbing film, it is preferable that the first anti-diffusion layer is a hardened layer of a radical polymerizable curable composition, and that the second anti-diffusion layer is Hardened layer of cationic polymerized curable composition.

Furthermore, in another embodiment of the present invention, any one of the first anti-diffusion layer and the second anti-diffusion layer may be an adhesive layer. In this specification, the so-called anti-diffusion layer is an adhesive layer, which means that the anti-diffusion layer is a layer with an adhesive function. A layer combined with other layers (such as a substrate, an optically anisotropic layer, a polarizing layer, etc.). If any one of the anti-diffusion layers is an adhesive layer, it is easy to reduce the thickness of the anti-diffusion layer, and it is possible to reduce the thickness of the light-absorption anisotropic plate. If the anti-diffusion layer becomes thinner, interface reflection and interference spots tend to easily occur at the interface between the anti-diffusion layer and the light-absorbing anisotropic film. However, the light-absorbing anisotropic plate of the present invention is The difference between the refractive index of the diffusion layer and the refractive index of the light-absorbing anisotropic film suppresses the occurrence of reflection at the interface between the diffusion-preventing layer and the light-absorbing anisotropic film, so that it is effective even if the thickness of the diffusion-preventing layer is thinned. To suppress the occurrence of interference spots.

The adhesive layer is a layer formed of an adhesive, and can be formed using a conventionally known adhesive composition as long as it can serve as a diffusion prevention layer satisfying the above formula (1) or formula (2). In this invention, as an adhesive composition which can form a diffusion prevention layer, the above-mentioned cationic polymerization type curable composition, a radical polymerization type curable composition, etc. are mentioned.

＜Absorptive Anisotropic Film＞ In the present invention, the light-absorbing anisotropic film is a cured film of a liquid crystal composition comprising a polymerizable liquid crystal compound, a polymerizable non-liquid crystal compound, and a dichroic dye. A cured film obtained by curing in a state aligned in a direction perpendicular to the plane of the light-absorbing anisotropic film.

In the present invention, the polymerizable liquid crystal compound contained in the liquid crystal composition for forming an anisotropic light absorption film (hereinafter also referred to as "the composition for forming an anisotropic light absorption film") has at least one polymerizable group , and a compound with liquid crystallinity. Here, the polymerizable group means a group that participates in a polymerization reaction, preferably a photopolymerizable group. The photopolymerizable group refers to a group that can participate in a polymerization reaction by active radicals or acids generated from a polymerization initiator. Examples of polymerizable groups in polymerizable liquid crystal compounds include vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloxy, and methacryl. Acyloxy, Oxiranyl, Oxetanyl, etc. Among them, free radical polymerizable groups are preferred, acryloxy groups, methacryloxy groups, vinyloxy groups, oxiranyl groups, and oxetanyl groups are more preferred, and acryloxy groups are more preferred. base.

In the present invention, the polymerizable liquid crystal compound is preferably a liquid crystal compound exhibiting a smectic liquid crystal phase. By using a polymerizable liquid crystal compound exhibiting a smectic liquid crystal phase, it is possible to form an anisotropic light-absorbing film with a high degree of alignment order and excellent polarization function in oblique directions. From the viewpoint of realizing a higher degree of alignment order, it is more preferable that the liquid crystal state exhibited by the polymerizable liquid crystal compound (A) is a higher order smectic phase (higher order smectic liquid crystal state). Here, the higher-order smectic phase means smectic B phase, smectic D phase, smectic E phase, smectic F phase, smectic G phase, smectic H phase, smectic I phase phase, smectic J phase, smectic K phase, and smectic L phase, and among these, smectic B phase, smectic F phase, and smectic I phase are more preferable. The liquid crystallinity may be a thermotropic liquid crystal or a lyotropic liquid crystal, but is preferably a thermotropic liquid crystal from the viewpoint of enabling dense film thickness control. In addition, the polymerizable liquid crystal compound (A) may be a monomer, or an oligomer or polymer obtained by polymerizing a polymerizable group.

The polymerizable liquid crystal compound is not particularly limited as long as it has at least one polymerizable group. Known polymerizable liquid crystal compounds can be used, and compounds exhibiting smectic liquid crystallinity are preferred. Such a polymerizable liquid crystal compound may, for example, be a compound represented by the following formula (A) (hereinafter also referred to as "polymerizable liquid crystal compound (A)"). U ¹ -V ¹ -W ¹ -(X ¹ -Y ¹ ) _n -X ² -W ² -V ² -U ² (A) [In formula (A), X ¹ and X ² independently represent divalent Aromatic group or divalent alicyclic hydrocarbon group, where the hydrogen atoms contained in the divalent aromatic group or divalent alicyclic hydrocarbon group can be replaced by halogen atoms, alkyl groups with 1 to 4 carbons, carbon A fluoroalkyl group with a number of 1 to 4, an alkoxy group with a carbon number of 1 to 4, a cyano group or a nitro group, the carbon atoms constituting the divalent aromatic group or divalent alicyclic hydrocarbon group may be replaced by oxygen atoms or sulfur atom or nitrogen atom; wherein, at least ^one of X1 and X2 is a 1,4 ^- phenylene group that may have a substituent or a cyclohexane-1,4-diyl group that may have a substituent; ^Y1 is A single bond or a divalent linking group; n is 1 to 3, and when n is 2 or more, the plural X ¹ may be the same or different from each other; X ² and any or all of the plural X ¹ may be The same or different; and, when n is 2 or more, the plurality of Y ¹ may be the same or different from each other; from the viewpoint of liquid crystallinity, n is preferably 2 or more; U ¹ represents a hydrogen atom or A polymeric group; U ² represents a polymerizable group; W ¹ and W ² are independently a single bond or a divalent linking group; V ¹ and V ² independently represent an alkanediyl group with 1 to 20 carbon atoms that may have substituents , the -CH ₂ - constituting the alkanediyl group can be substituted by -O-, -CO-, -S- or NH-]

In the polymerizable liquid crystal ^compound ( ^A ), X1 and X2 are independent of each other, and are preferably 1,4-phenylene groups which may have substituents, or cyclohexane-1,4-diyl groups which may have substituents , at least one of X ¹ and X ² is a 1,4-phenylene group that may have a substituent, or a cyclohexane-1,4-diyl group that may have a substituent, preferably trans-cyclohexane Alkane-1,4-diyl. As the optional substituent of the 1,4-phenylene group which may have a substituent or the cyclohexane-1,4-diyl group which may have a substituent, carbon such as a methyl group, an ethyl group, and a butyl group may be mentioned. Alkyl groups of 1 to 4, cyano groups, chlorine atoms, fluorine atoms and other halogen atoms. Preferably it is unsubstituted.

In addition, the polymerizable liquid crystal compound (A) is preferably the formula (A) in terms of easily exhibiting smectic liquid crystallinity, the formula (A1): -(X ¹ -Y ¹ ) _n -X ² - (A1) [wherein, X ¹ , Y ¹ , X ² and n represent the same meanings as above] [hereinafter also referred to as partial structure (A1)] is an asymmetric structure. The polymerizable liquid crystal compound (A) whose partial structure (A1) is an asymmetric structure includes, for example, a polymerizable liquid crystal compound (A) in which n is 1 and one X ¹ and X ² are mutually different structures. In addition, it can also be exemplified: n is 2, and two ^Y1s are compounds having the same structure as each other, and two X1s are compounds having the same structure as each other, and ^one X2 is a compound having ^a different structure from these ^two X1s. Polymerizable liquid crystal ^compound ( ^A ) ^; among the ^{two X1s, the X1 bonded to W1 has a different} structure from the other X1 and X2, and the other ^X1 and X2 have the same structure as each other. Liquid crystal compound (A). Further examples include: n is 3, three ^Y1s are compounds of the same structure, and any one of the ^{three X1s} and one X2 is a polymerizable liquid crystal compound having a structure different from all the other three (A).

Y ¹ is preferably -CH ₂ CH ₂ -, -CH ₂ O-, -CH ₂ CH ₂ O-, -COO-, -OCOO-, single bond, -N=N-, -CR ^a =CR ^b - , -C≡C-, -CR ^a =N- or -CO-NR ^a -. R ^a and R ^b independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Y ¹ is more preferably -CH ₂ CH ₂ -, -CH ₂ O-, -COO-, -OCOO-, single bond, -N=N-, -CR ^a =CR ^b -, -C≡C- or - CR ^a =N-, more preferably -CH ₂ CH ₂ -, -COO-, -CH ₂ O- or a single bond, when there are multiple Y ^{1 s} , and more preferably Y bonded to X ^{2 1} is -CH ₂ CH ₂ - or -CH ₂ O-, and Y ¹ not bonded to X ² is -CH ₂ CH ₂ -, -COO- or a single bond. When all of X ¹ and X ² have the same structure, it is preferable that there are two or more Y ¹ having different bonding modes. In the case where there are a plurality of ^Y1s having different bonding methods, the structure is asymmetrical, so it tends to exhibit smectic liquid crystallinity.

U ² is a polymeric group. U ¹ is a hydrogen atom or a polymerizable group, preferably a polymerizable group. U ¹ and U ² are preferably both polymerizable groups, more preferably both photopolymerizable groups, and still more preferably both photoradical polymerizable groups. The polymerizable group may, for example, be the same as the group exemplified above as the polymerizable group possessed by the polymerizable liquid crystal compound. ^The polymerizable group represented by U1 and the polymerizable group represented by ^U2 can be different from each other, but they are preferably the same type of group, preferably at least ^one of U1 and U2 is ⁽ meth)acryloxy group, more preferably both are (meth)acryloyloxy groups, still more preferably acryloyloxy groups. In addition, the polymerizable group may be in a polymerized state or may be in a non-polymerized state, and is preferably in a non-polymerized state.

Examples of the alkanediyl groups represented by V1 and V2 include methylene, ethylidene, propane ^- 1,3 ^- diyl, butane-1,3-diyl, butane-1,4 -diyl, pentane-1,5-diyl, hexane-1,6-diyl, heptane-1,7-diyl, octane-1,8-diyl, decane-1,10 -diyl, tetradecane-1,14-diyl, eicosane-1,20-diyl, etc. V ¹ and V ² are preferably an alkanediyl group having 2 to 12 carbons, more preferably an alkanediyl group having 6 to 12 carbons.

The optional substituents of the alkanediyl group include cyano groups, chlorine atoms, fluorine atoms and other halogen atoms, and the alkanediyl groups are preferably unsubstituted, more preferably unsubstituted linear alkane groups. Two bases.

W ¹ and W ² are preferably a single bond, -O-, -S-, -COO- or -OCOO- independently of each other, more preferably a single bond or -O-.

The structure of the polymerizable liquid crystal compound that is likely to exhibit smectic liquid crystallinity is preferably a molecular structure having an asymmetric molecular structure, specifically, the following (A-a) to (A-i) are more preferable A polymeric liquid crystal compound that has a partial structure and exhibits smectic liquid crystallinity. It is more preferable to have a partial structure of (A-a), (A-b) or (A-c) from the viewpoint of easily expressing higher-order smectic liquid crystallinity. In addition, in following (A-a)-(A-i), * represents a bond (single bond).

[Chem 3]

As a polymeric liquid crystal compound (A), the compound represented by following formula (A-1) - a formula (A-25) is mentioned, for example. When the polymerizable liquid crystal compound (A) has a cyclohexane-1,4-diyl group, the cyclohexane-1,4-diyl group is preferably a trans form.

[chemical 4]

[chemical 5]

[chemical 6]

[chemical 7]

[chemical 8]

Among them, preferably selected from formula (A-2), formula (A-3), formula (A-4), formula (A-6), formula (A-7), formula (A-8 ), at least one of the group consisting of compounds represented by formula (A-13), formula (A-14) and formula (A-15). As the polymerizable liquid crystal compound (A), one type may be used alone, or two or more types may be used in combination.

The polymerizable liquid crystal compound (A) can be produced by a known method described in, for example, Lub et al. Recl. Trav. Chim. Pays-Bas, 115, 321-328 (1996) or Japanese Patent No. 4719156.

In the present invention, the anisotropic light-absorption film is preferably formed including a polymerizable liquid crystal compound (A), and the anisotropic light-absorption film-forming composition preferably includes a polymerizable liquid crystal compound (A). When two or more polymerizable liquid crystal compounds are contained in the composition for forming an anisotropic light absorption film, the polymerizable liquid crystal compound contained in the composition for forming an anisotropic light absorption film The ratio of the neutral liquid crystal compound (A) is preferably at least 51% by mass, more preferably at least 70% by mass, further preferably at least 90% by mass. When the ratio of the polymerizable liquid crystal compound (A) is within the above range, it is easy to obtain a light-absorbing anisotropic film with a high degree of alignment order.

When the light-absorbing anisotropic film-forming composition contains two or more polymerizable liquid crystal compounds, at least one of them may be the polymerizable liquid crystal compound (A), or all of them may be the polymerizable liquid crystal compound (A). ). By combining a plurality of polymerizable liquid crystal compounds, liquid crystallinity may be temporarily maintained even at a temperature below the liquid crystal-crystal phase transition temperature.

The content of the polymerizable liquid crystal compound in the composition for forming an anisotropic light absorption film is preferably from 40 to 99.9% by mass, more preferably from 60 to 99% by mass, and still more preferably from the solid content of the liquid crystal composition. Preferably, it is 70 to 99% by mass. When content of a polymeric liquid crystal compound exists in the said range, there exists a tendency for the orientation of a polymeric liquid crystal compound to become high.

A dichroic dye means a dye having a property in which the absorbance in the long-axis direction of the molecule is different from the absorbance in the short-axis direction. The dichroic dye that can be used in the present invention is not particularly limited as long as it has the above properties, and may be a dye or a pigment. In addition, two or more dyes or pigments may be used in combination, respectively, or a dye and a pigment may be used in combination. In addition, the dichroic dye may have polymerizability or liquid crystallinity.

The dichroic dye is preferably one having an absorption maximum wavelength (λ _MAX ) in the wavelength range of 300 to 700 nm in the light-absorbing anisotropic film.

Examples of such dichroic dyes include acridine dyes, cyanine dyes, cyanine dyes, naphthalene dyes, azo dyes, and anthraquinone dyes. Among them, azo dyes are preferred. The azo dye may, for example, be a monoazo dye, a disazo dye, a trisazo dye, a tetrazo dye, or a stilbene azo dye, preferably a disazo dye or a trisazo dye.

As an azo dye, the compound (henceforth also referred to as "compound (I)") represented by formula (I) is mentioned, for example. K ¹ (-N=NK ² ) _p -N=NK ³ (I) [In the formula (I), K ¹ and K ³ independently represent a phenyl group which may have a substituent, a naphthyl group which may have a substituent, A benzoic acid phenyl group that may have a substituent or a valent heterocyclic group that may have a substituent; K represents a ^p -phenylene group that may have a substituent, naphthalene-1,4-diyl that may have a substituent, A 4,4'-stilylene group with a substituent or a divalent heterocyclic group that may have a substituent; p represents an integer of 0 to 4; when p is an integer of 2 or more, the plurality of K ² may be identical to each other , can also be different; in the range that shows absorption in the visible light range, the -N=N- bond can be replaced by a -C=C-, -COO-, -NHCO-, -N=CH- bond]

Examples of the monovalent heterocyclic group include those obtained by removing one hydrogen atom from heterocyclic compounds such as quinoline, thiazole, benzothiazole, thienothiazole, imidazole, benzimidazole, oxazole, and benzothiazole base. The divalent heterocyclic group may, for example, be a group obtained by removing two hydrogen atoms from the above heterocyclic compound.

As phenyl, naphthyl, benzoate phenyl group and monovalent heterocyclic group in K ¹ and K ³ , and p-phenylene, naphthalene-1,4-diyl, 4,4'- in K ² The optional substituents of the stilylene group and the divalent heterocyclic group include, for example, an alkyl group having 1 to 20 carbon atoms, an alkyl group having 1 to 20 carbon atoms having a polymerizable group, and an alkene group having 1 to 4 carbon atoms. Alkoxy groups with 1 to 20 carbons such as methoxy, ethoxy and butoxy; alkoxy groups with 1 to 20 carbons having a polymerizable group; trifluoromethyl groups with 1 to 4 carbons Fluorinated alkyl group; cyano group; nitro group; halogen atom; An amino group of an alkyl group having 1 to 6 carbon atoms, an amino group having one or two alkyl groups having 1 to 6 carbon atoms having a polymerizable group, or two substituted alkyl groups bonded to each other to form a carbon number of 2 to 6 The amino group of the alkanediyl group of 8; the unsubstituted amino group is -NH ₂ ) and the like. In addition, as said polymeric group, a (meth)acryl group, a (meth)acryloxy group, etc. are mentioned.

[式(I-1)～(I-8)中， B ¹～B ³⁰相互獨立地表示氫原子、碳數1～6之烷基、碳數1～6之烯基、碳數1～4之烷氧基、氰基、硝基、經取代或未經取代之胺基(經取代之胺基及未經取代之胺基之定義如上所述)、氯原子或三氟甲基； n1～n4相互獨立地表示0～3之整數； 於n1為2以上之情形時，複數個B ²相互可相同，亦可不同， 於n2為2以上之情形時，複數個B ⁶相互可相同，亦可不同， 於n3為2以上之情形時，複數個B ⁹相互可相同，亦可不同， 於n4為2以上之情形時，複數個B ¹⁴相互可相同，亦可不同] Among the compounds (I), preferred are compounds represented by any one of the following formulas (I-1) to (I-8). [chemical 9]

[In the formulas (I-1) to (I-8), B ¹ to B ³⁰ independently represent a hydrogen atom, an alkyl group with 1 to 6 carbons, an alkenyl group with 1 to 6 carbons, an alkenyl group with 1 to 4 carbons Alkoxy, cyano, nitro, substituted or unsubstituted amino (the definition of substituted and unsubstituted amino is as above), chlorine atom or trifluoromethyl; n1～ n4 independently represents an integer of 0 to 3; when n1 is 2 or more, the plurality of B ² may be the same or different; when n2 is 2 or more, the plurality of B ⁶ may be the same or different may be different, when n3 is 2 or more, the plurality of B ⁹ may be the same or different, and when n4 is 2 or more, the plurality of B ¹⁴ may be the same or different]

[式(I-9)中， R ¹～R ⁸相互獨立地表示氫原子、-R ^x、-NH ₂、-NHR ^x、-NR ^x ₂、-SR ^x或鹵素原子； R ^x表示碳數1～4之烷基或碳數6～12之芳基] The above-mentioned anthraquinone dye is preferably a compound represented by formula (I-9). [chemical 10]

[In formula (I-9), R ¹ to R ⁸ independently represent a hydrogen atom, -R ^x , -NH ₂ , -NHR ^x , -NR ^x ₂ , -SR ^x or a halogen atom; R ^x represents a carbon number 1-4 alkyl or aryl with 6-12 carbons]

[式(I-10)中， R ⁹～R ¹⁵相互獨立地表示氫原子、-R ^x、-NH ₂、-NHR ^x、-NR ^x ₂、-SR ^x或鹵素原子； R ^x表示碳數1～4之烷基或碳數6～12之芳基] The above-mentioned 㗁𠯤 pigment is preferably a compound represented by formula (I-10). [chemical 11]

[In formula (I-10), R ⁹ to R ¹⁵ independently represent a hydrogen atom, -R ^x , -NH ₂ , -NHR ^x , -NR ^x ₂ , -SR ^x or a halogen atom; R ^x represents a carbon number 1-4 alkyl or aryl with 6-12 carbons]

[式(I-11)中， R ¹⁶～R ²³相互獨立地表示氫原子、-R ^x、-NH ₂、-NHR ^x、-NR ^x ₂、-SR ^x或鹵素原子； R ^x表示碳數1～4之烷基或碳數6～12之芳基] 於式(I-9)、式(I-10)及式(I-11)中，作為R ^x之碳數1～6之烷基，可例舉甲基、乙基、丙基、丁基、戊基及己基等，作為碳數6～12之芳基，可例舉苯基、甲苯甲醯基、二甲苯基及萘基等。 The acridine dye is preferably a compound represented by formula (I-11). [chemical 12]

[In formula (I-11), R ¹⁶ to R ²³ independently represent a hydrogen atom, -R ^x , -NH ₂ , -NHR ^x , -NR ^x ₂ , -SR ^x or a halogen atom; R ^x represents a carbon number An alkyl group of 1 to 4 or an aryl group of 6 to 12 carbons] In formula (I-9), formula (I-10) and formula (I-11), an alkane with 1 to 6 carbons as R ^x As the aryl group having 6 to 12 carbon atoms, examples include phenyl, toluyl, xylyl and naphthyl. Wait.

[式(I-12)中， D ¹及D ²相互獨立地表示式(I-12a)～式(I-12d)之任一者所表示之基； [化14]

n5表示1～3之整數] [化15]

[式(I-13)中， D ³及D ⁴相互獨立地表示式(I-13a)～式(1-13h)之任一者所表示之基； [化16]

n6表示1～3之整數] As the above-mentioned cyanine dye, compounds represented by formula (I-12) and compounds represented by formula (I-13) are preferable. [chemical 13]

[In formula (I-12), D ¹ and D ² independently represent the group represented by any one of formula (I-12a) ~ formula (I-12d); [Chemical 14]

n5 represents an integer of 1 to 3] [Chemical 15]

[In formula (I-13), D ³ and D ⁴ independently represent the group represented by any one of formula (I-13a) ~ formula (1-13h); [Chemical 16]

n6 represents an integer from 1 to 3]

Dichroic dyes may be used alone or in combination. Due to its high linearity, azo pigments are suitable for the production of light-absorbing anisotropic films with excellent polarizing properties. From the viewpoint of polarizing performance and anti-dyeing performance, it is preferable to include an azo dye in which any one of K ¹ to K ³ in the above formula (I) is thienothiazole or benzothiazole. When polarizing properties are required over the entire range of visible light, it is easy to control the polarizing properties by combining two or more dichroic dyes, more preferably three or more.

When combining multiple types of dichroic dyes, it is preferable to include at least one of them having a maximum absorption wavelength in the wavelength range of 500 nm to 600 nm in the light-absorption anisotropic film. In the case of combining two dichroic dyes, it is preferable to include those having a maximum absorption wavelength in the range of 350 nm to 499 nm, or 601 nm to 750 nm. In the case of combining three dichroic dyes, Preferably, they are dichroic dyes having maximum absorption wavelengths in the ranges of 350 nm to 499 nm, 500 nm to 600 nm, and 601 nm to 750 nm, respectively. By combining dichroic dyes in this way, it is easier to improve the polarizing function in the oblique direction, for example, it can become a light-absorbing anisotropic plate suitable for use as an optical film for privacy protection.

By selecting the dichroic dye used according to the application of the light-absorption anisotropic plate, specific light-absorption characteristics can be imparted to the light-absorption anisotropic film. In one embodiment of the present invention, the light-absorbing anisotropic film may have maximum absorption at a wavelength of 550 nm to 700 nm, or may have maximum absorption at a wavelength of 550 nm to 700 nm, And it does not have a maximum absorber between wavelengths above 400 nm and below 550 nm.

The weight average molecular weight of the dichroic dye is usually 300-2000, preferably 400-1000.

In one embodiment of the present invention, the dichroic dye constituting the light-absorbing anisotropic film is preferably hydrophobic. If the dichroic dye is hydrophobic, the compatibility between the dichroic dye and the polymerizable liquid crystal compound is improved, the dichroic dye and the polymerizable liquid crystal compound form a uniform phase state, and it is easy to obtain light absorption anisotropy with a high alignment order membrane. Furthermore, in the present invention, the hydrophobic dichroic dye means a dye whose solubility in 100 g of water at 25° C. is 1 g or less.

The content of the dichroic dye in the composition for forming an anisotropic light-absorbing film can be appropriately determined according to the type of the dichroic dye to be used, and is preferably 0.1 to 30 parts by mass relative to 100 parts by mass of the polymerizable liquid crystal compound. part, more preferably 0.1 to 20 parts by mass, still more preferably 0.1 to 10 parts by mass, particularly preferably 0.1 to 5 parts by mass. When the content of the dichroic dye is within the above range, the alignment of the polymerizable liquid crystal compound is less likely to be disturbed, and an anisotropic light-absorbing film having a higher alignment order can be obtained. Furthermore, when including two or more kinds of dichroic dyes, it is preferable that the total amount of all dichroic dyes is within the above-mentioned range.

The light-absorption anisotropic film-forming composition may contain a polymerization initiator. The polymerization initiator is a compound capable of initiating a polymerization reaction of a polymerizable liquid crystal compound or the like. As a polymerization initiator, in terms of initiating a polymerization reaction at a lower temperature, it is preferably a photopolymerization initiator that generates active free radicals or acids by the action of light, and is more preferably a photopolymerization initiator that generates active radicals or acids by the action of light. A photopolymerization initiator that generates free radicals. A polymerization initiator may be used individually or in combination of 2 or more types.

系化合物、鹵代苯乙酮系化合物、二烷氧基苯乙酮系化合物、鹵代雙咪唑系化合物、鹵代三𠯤系化合物、三𠯤系化合物等。 As the photopolymerization initiator, known photopolymerization initiators can be used. For example, photopolymerization initiators that generate active radicals include self-cleavage photopolymerization initiators and hydrogen abstraction photopolymerization initiators. As the self-cleavage type photopolymerization initiator, self-cleavage type benzoin-based compounds, acetophenone-based compounds, hydroxyacetophenone-based compounds, α-aminoacetophenone-based compounds, oxime ester-based compounds, acyl Phosphine oxide-based compounds, azo-based compounds, etc. Also, as hydrogen abstraction type photopolymerization initiators, hydrogen abstraction type benzophenone-based compounds, benzoin ether-based compounds, benzyl ketal-based compounds, dibenzocycloheptanone-based compounds, and anthraquinone-based compounds can be used. , ketone series compounds, 9-oxosulfur 𠮿

series compounds, halogenated acetophenone series compounds, dialkoxyacetophenone series compounds, halogenated bis-imidazole series compounds, halogenated three-series compounds, three-series compounds, etc.

As the acid-generating photopolymerization initiator, iodonium salts, permeic acid salts, and the like can be used.

Among them, from the viewpoint of preventing the dissolution of the pigment, the reaction at a low temperature is preferred, and from the viewpoint of the reaction efficiency at a low temperature, a self-cleavage type photopolymerization initiator is preferred, and an acetophenone-based one is particularly preferred. Compounds, hydroxyacetophenone-based compounds, α-aminoacetophenone-based compounds, oxime ester-based compounds.

As a photoinitiator, specifically, the following are mentioned, for example. Benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether and benzoin isobutyl ether and other benzoin compounds; 2-Hydroxy-2-methyl-1-phenylpropan-1-one, 1,2-diphenyl-2,2-dimethoxyethan-1-one, 2-hydroxy-2-methyl -1-[4-(2-hydroxyethoxy)phenyl]propane-1-one, 1-hydroxycyclohexyl phenyl ketone and 2-hydroxy-2-methyl-1-[4-(1-methyl Hydroxyacetophenone compounds such as oligomers of vinyl)phenyl]propan-1-one; 2-methyl-2-𠰌linyl-1-(4-methylthiophenyl)propan-1-one, 2-dimethylamino-2-benzyl-1-(4-𠰌linylphenyl) ) butane-1-one and other α-aminoacetophenone compounds; 1,2-octanedione, 1-[4-(phenylthio)-,2-(O-benzoyl oxime)], ethyl ketone, 1-[9-ethyl-6-(2- Oxime ester compounds such as methylbenzoyl)-9H-carbazol-3-yl]-,1-(O-acetyloxime); Acylphosphine oxide compounds such as 2,4,6-trimethylbenzoyldiphenylphosphine oxide and bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide; Benzophenone, methyl phthalylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4'-methyl diphenyl sulfide, 3,3',4,4'- Benzophenone compounds such as tetrakis(tert-butylperoxycarbonyl)benzophenone and 2,4,6-trimethylbenzophenone; Dialkoxyacetophenone compounds such as diethoxyacetophenone; 2,4-bis(trichloromethyl)-6-(4-methoxyphenyl)-1,3,5-trichloromethyl, 2,4-bis(trichloromethyl)-6-(4- Methoxynaphthyl)-1,3,5-trimethoxyl, 2,4-bis(trichloromethyl)-6-(4-methoxystyryl)-1,3,5-trimethoxyl, 2,4-bis(trichloromethyl)-6-[2-(5-methylfuran-2-yl)ethenyl]-1,3,5-trimethanone, 2,4-bis(trichloromethyl Base)-6-[2-(furan-2-yl)ethenyl]-1,3,5-three 𠯤, 2,4-bis(trichloromethyl)-6-[2-(4-diethyl Amino-2-methylphenyl)vinyl]-1,3,5-trimethoxy and 2,4-bis(trichloromethyl)-6-[2-(3,4-dimethoxy Phenyl)vinyl]-1,3,5-trisalpine and other trisylvanic compounds. The photopolymerization initiator may be appropriately selected from the photopolymerization initiators described above, for example, depending on the relationship with the polymerizable liquid crystal compound and the polymerizable non-liquid crystal compound that form the light-absorbing anisotropic film.

Moreover, a commercially available photopolymerization initiator can be used. Examples of commercially available polymerization initiators include: Irgacure (registered trademark) 907, 184, 651, 819, 250 and 369, 379, 127, 754, OXE01, OXE02, OXE03 (manufactured by BASF); Omnirad BCIM, Esacure 1001M, Esacure KIP160 (manufactured by IDM Resins B.V.); Seikuol (registered trademark) BZ, Z, and BEE (manufactured by Seiko Chemical Co., Ltd.); Kayacure (registered trademark) BP100 and UVI-6992 (manufactured by Dow Chemical Co., Ltd. manufactured); Adeka Optomer SP-152, N-1717, N-1919, SP-170, Adeka Arkles NCI-831, Adeka Arkles NCI-930 (manufactured by ADEKA Co., Ltd.); TAZ-A, and TAZ-PP (Nihon SiberHegner Co., Ltd.); and TAZ-104 (Sanwa Chemical Co., Ltd.) and the like.

The content of the polymerization initiator is preferably 0.1 to 20 parts by mass, more preferably 0.1 to 15 parts by mass, further preferably 0.5 to 10 parts by mass, and most preferably 0.5 to 8 parts by mass relative to 100 parts by mass of the polymerizable liquid crystal compound. parts by mass. If the content of the polymerization initiator is within the above range, the polymerization reaction can be performed without disturbing the alignment of the polymerizable liquid crystal compound too much.

The light-absorbing anisotropic film may also contain a leveling agent. The leveling agent has the function of adjusting the fluidity of the composition for forming an anisotropic light-absorbing film and making the coating film obtained by coating the composition more flat. Specifically, a surfactant may be mentioned. The leveling agent is preferably at least one selected from the group consisting of a leveling agent whose main component is a polyacrylate compound and a leveling agent whose main component is a compound containing a fluorine atom. A leveling agent may be used individually or in combination of 2 or more types.

As the leveling agent whose main component is a polyacrylate compound, for example, BYK-350, BYK-352, BYK-353, BYK-354, BYK-355, BYK-358N, BYK-361N, BYK-380, BYK-381 and BYK-392 (BYK Chemie).

As a leveling agent whose main component is a compound containing a fluorine atom, for example, Megafac (registered trademark) R-08, R-30, R-90, F-410, F-411, F-443, F- 445, F-470, F-471, F-477, F-479, F-482, F-483 and F-556 (DIC (stock)); Surflon (registered trademark) S-381, S-382, S -383, S-393, SC-101, SC-105, KH-40 and SA-100 (AGC Qingmei Chemical Co., Ltd.); E1830, E5844 (Daikin Institute of Fine Chemicals Co., Ltd.); Eftop EF301, Eftop EF303, Eftop EF351 and Eftop EF352 (Mitsubishi Materials Electrochemical Co., Ltd.).

When the light-absorbing anisotropic film contains a leveling agent, the content thereof is preferably 0.01 to 5 parts by mass, more preferably 0.05 to 3 parts by mass, based on 100 parts by mass of the polymerizable liquid crystal compound. When the content of the leveling agent is within the above range, the polymerizable liquid crystal compound tends to be easily aligned, unevenness is less likely to occur, and a smoother light-absorbing anisotropic film tends to be obtained.

The light-absorbing anisotropic film may also contain other additives than the leveling agent. Examples of other additives include colorants such as polymerizable non-liquid crystal compounds, photosensitizers, antioxidants, release agents, stabilizers, and bluing agents, flame retardants, lubricants, and the like. When other additives are contained, the content of the other additives is preferably more than 0% and 20% by mass, more preferably more than 0% and less than the solid content of the light absorption anisotropic film-forming composition. 10% by mass or less.

The light-absorbing anisotropic film-forming composition can be produced by a conventionally known method for preparing a liquid crystal composition, usually, by mixing a polymerizable liquid crystal compound, a polymerizable non-liquid crystal compound, and a dichroic dye, and optionally The polymerization initiator and the above-mentioned additives are mixed and stirred to prepare. Also, in general, since the liquid crystal compound exhibiting smectic liquid crystallinity has a high viscosity, from the viewpoint of improving the applicability of the liquid crystal composition and making it easy to form an anisotropic light-absorbing film, it can be obtained by A solvent is added to the liquid crystal composition to adjust the viscosity.

The solvent may be appropriately selected according to the solubility of the polymerizable liquid crystal compound, polymerizable non-liquid crystal compound, dichroic dye, etc. to be used, and is preferably a solvent that can completely dissolve the above components and is inert to the polymerization reaction.

As the solvent, for example: alcohol solvents such as methanol, ethanol, ethylene glycol, isopropanol, propylene glycol, ethylene glycol methyl ether, ethylene glycol butyl ether, and propylene glycol monomethyl ether; Ester solvents such as glycol methyl ether acetate, γ-butyrolactone or propylene glycol methyl ether acetate and ethyl lactate; acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone and methyl Ketone solvents such as isobutyl ketone; aliphatic hydrocarbon solvents such as pentane, hexane and heptane; aromatic hydrocarbon solvents such as toluene and xylene; nitrile solvents such as acetonitrile; ether solvents such as tetrahydrofuran and dimethoxyethane; Chlorinated solvents such as chloroform and chlorobenzene, etc. These solvents may be used alone or in combination of two or more.

The content of the solvent is preferably from 100 to 1900 parts by mass, more preferably from 150 to 1000 parts by mass, and still more preferably from 180 to 800 parts by mass, based on 100 parts by mass of the solid content of the composition for forming an anisotropic light absorption film. .

In the present invention, the light-absorbing anisotropic film is a film obtained by hardening a polymerizable liquid crystal compound and a dichroic dye in a state aligned in a direction perpendicular to the plane of the film. When any direction within the film is defined as the x-axis, the direction perpendicular to the x-axis within the film surface is defined as the y-axis, and the film thickness direction perpendicular to the x-axis and y-axis is defined as the z-axis, the following equation (3 ). Az＞(Ax＋Ay)/2 (3) [In the formula (3), Ax, Ay and Az are the absorbance under the absorption maximum wavelength of the dichroic pigment in the light-absorbing anisotropic film, and Ax represents the absorbance of linearly polarized light vibrating along the x-axis direction, Ay represents the absorbance of linearly polarized light vibrating along the y-axis direction, Az represents the absorbance of linearly polarized light vibrating along the z-axis]

Ax can be measured by incident linearly polarized light vibrating along the x-axis direction toward the film surface from the z-axis direction. Ay can be measured by incident linearly polarized light vibrating in the y-axis direction toward the film surface from the z-axis direction. Az can be measured, for example, from the x-y plane direction toward the side of the film, that is, when the light-absorbing anisotropic film is set to the x-y plane, linearly polarized light vibrating in the z-axis direction is perpendicularly incident on the side (thickness direction) and measured.

The absorbance in the z direction in formula (3) may be difficult to measure due to light incident from the side of the film. In this regard, when the angle between the vibrating plane of the linearly polarized light and the x-y plane of the film is set to 90°, the x-y plane of the film is inclined 30° and 60° relative to the vibrating plane along the incident direction of the linearly polarized light. ° to measure, so that the absorbance in the Az direction can be estimated.

Specifically, it can be estimated according to the following method or the like. Ax (z=30) and Ax (z=60) were measured by injecting the same linearly polarized light as the linearly polarized light measured for Ax while rotating the film by 30° and 60° with the y-axis as the rotation axis, and the same Specifically, Ay (z=30) and Ay (z=60) were measured by injecting the same linearly polarized light as the linearly polarized light that measured Ay while the film was rotated by 30° and 60° with the x-axis as the axis of rotation. . At this time, if Ax(z=30)<Ax(z=60) and Ay(z=30)=Ay(z=60), then Ax(z=30)<Ax(z=60)<Ax(z =90)=Az, and, if Ay(z=30)<Ay(z=60) and Ax(z=30)=Ax(z=60), then Ay(z=30)<Ay(z=60 )<Ay(z=90)=Az, so formula (3) must be satisfied.

Especially when there is no absorption anisotropy in the x-y plane, that is, when Ax and Ay are equal, since Ax(z=30)=Ay(z=30) and Ax(z=60)=Ay(z =60), so Ax(z=30) and Ay(z=30) can be A(z=30), and Ax(z=60) and Ay(z=60) can be A(z=60) . That is, if A(z=30)<A(z=60), the relationship of A(z=30)<A(z=60)<A(z=90)=Az is satisfied. Furthermore, if A(z=30)>(Ax+Ay)/2, Az must satisfy the formula (3).

Moreover, in the present invention, it is preferable that the light-absorbing anisotropic film satisfy the following formulas (4) and (5) in addition to the above-mentioned formula (3). Ax(z＝60)/Ax＞5 (4) Ay(z＝60)/Ay＞5 (5) [In formula (4) and (5), the implication of Ax, Ay and Az is the same as above; Ax (z=60) and Ay (z=60) are all the dichroic pigments in the light absorption anisotropic film Absorbance at the maximum wavelength, and Ax(z=60) represents the absorbance of linearly polarized light vibrating in the direction of the x-axis when the film is rotated 60° with the y-axis as the axis of rotation, Ay(z=60) represents the absorbance of linearly polarized light vibrating in the direction of the y-axis when the film is rotated 60° with the x-axis as the axis of rotation]

Ax (z=60) can be measured by injecting the same linearly polarized light as the linearly polarized light which measured Ax in the state which rotated the said film by 60 degrees using the y-axis as a rotation axis. Here, the rotation of the film was performed by rotating the film in the state of Ax by 60° with the y-axis as the rotation axis along the incident direction of linearly polarized light. Ay (z=60) can be measured by injecting the same linearly polarized light as the linearly polarized light which measured Ay in the state which rotated the said film by 60 degrees using the x-axis as a rotation axis. Here, the rotation of the film was performed by rotating the film in the state where Ay was measured by 60° with the x-axis as the rotation axis along the incident direction of linearly polarized light.

Ax(z=60)/Ax and Ay(z=60)/Ay mean that the larger the numerical values are, the more excellent the light absorption anisotropy is. These numerical values may be, for example, 50 or less, and may be 30 or less. Furthermore, in this invention, it is more preferable that a light absorption anisotropic film satisfies following formula (6) and (7). Ax(z＝60)/Ax＞10 (6) Ay(z＝60)/Ay＞10 (7) By using a compound that forms a smectic liquid crystal phase, especially a higher-order smectic liquid crystal phase, as a polymerizable liquid crystal compound, it is possible to easily obtain the compounds satisfying the above-mentioned formulas (4) and (5), or formulas (6) and (7). ) light-absorbing anisotropic film.

If the light-absorbing anisotropic film satisfies formula (3), formula (4) and formula (5), it can be said to have excellent absorption anisotropy, that is, excellent polarizing performance. With this excellent characteristic, the light from the front direction can be effectively transmitted, and the light from the oblique direction can be effectively absorbed.

The thickness of the light-absorbing anisotropic film is preferably at least 0.1 μm, more preferably at least 0.2 μm, further preferably at least 0.3 μm, and more preferably at most 2 μm, more preferably at most 1.5 μm, further preferably at least 1 μm or less. When the thickness of the light-absorbing anisotropic film is more than the above-mentioned lower limit, the light absorption from the oblique direction becomes good, and it is easy to improve the polarization characteristics in the oblique direction. When the thickness is not more than the above-mentioned upper limit, it is difficult to disturb the polymerizable liquid crystal compound. The alignment of chromatic pigments can ensure high transmittance in the front direction, and it can be expected to be thinner when assembled in display devices and the like.

In the present invention, the light-absorbing anisotropic film is preferably a cured liquid crystal film with a high degree of alignment order. A liquid crystal cured film with a high degree of alignment order can obtain Buhlerg peaks derived from higher-order structures such as hexagonal phases or crystals in X-ray diffraction measurements. The Bragg peak means a peak derived from a planar periodic structure of molecular alignment. Therefore, it is preferable that the light-absorption anisotropic film constituting the light-absorption anisotropic plate of the present invention shows a Buhlerg peak in X-ray diffraction measurement. That is, in the light-absorption anisotropic film constituting the light-absorption anisotropic plate of the present invention, it is preferable that the polymerizable liquid crystal compound or its polymer be such that the film exhibits a Buhlerg peak in X-ray diffraction measurement. pairing. In the present invention, it is preferably an anisotropic film of light absorption with a molecular alignment surface period interval of 3.0-6.0 Å. A high degree of alignment order such as showing a Buhlerg peak can be achieved by controlling the type of polymerizable liquid crystal compound used, the type or amount of dichroic dye, and the type or amount of polymerization initiator, etc. accomplish.

＜How to make light absorption anisotropic plate＞ In the present invention, the light absorption anisotropic film can be obtained by aligning the absorption axes of dichroic dyes in a direction perpendicular to the film surface. The direction of the absorption axis of the dichroic dye in this guest-host type light absorption anisotropic film is generally controlled by the direction in which the polymerizable liquid crystal compound is aligned. Ordinarily, the absorption axis of the dichroic dye can be aligned in the direction perpendicular to the film surface by aligning the molecular major axis of the polymerizable liquid crystal compound in the direction perpendicular to the film surface. The alignment direction of the polymerizable liquid crystal compound can be determined by the properties of the substrate coated with the liquid crystal composition comprising the polymerizable liquid crystal compound, the polymerizable non-liquid crystal compound and the dichroic pigment, or the properties of the alignment film, and the properties of the polymerizable liquid crystal compound Take control.

In the present invention, the light absorption anisotropic plate can be produced, for example, by the following production method, which is A method for manufacturing a light-absorbing anisotropic plate formed by laminating a first anti-diffusion layer on one side of the light-absorbing anisotropic film with or without an alignment film, and a second anti-diffusion layer on the other surface, including the following steps: (i) forming a coating film of a liquid crystal composition comprising a polymerizable liquid crystal compound and a dichroic pigment on the first diffusion prevention layer; (ii) drying the obtained coating film to obtain a dry coating film; (iii) hardening the coating film in a state where the polymerizable liquid crystal compound and the dichroic dye are aligned in a direction perpendicular to the plane of the coating film to form an anisotropic light-absorbing film; and (iv) A second diffusion prevention layer is formed on the surface of the formed light-absorption anisotropic film opposite to the first diffusion prevention layer.

In the step (i), as a method of coating a liquid crystal composition containing a polymerizable liquid crystal compound and a dichroic dye on the first diffusion prevention layer, for example, a spin coating method, extrusion method, gravure coating Coating methods such as coating methods, die coating methods, bar coating methods, dressing methods, etc., printing methods such as flexographic methods, etc. are known methods.

In the present invention, the light-absorbing anisotropic film-forming composition may be formed directly on the first anti-diffusion layer, or may be formed on an alignment film formed on the first anti-diffusion layer. The alignment film has an alignment restricting force for aligning the polymerizable liquid crystal compound in the desired direction. By coating the alignment film with a composition for forming an anisotropic light absorption film, it is easy to obtain a high-precision aligned light absorption anisotropy. Tropical film. As an alignment film, it is preferable to have solvent resistance not to be dissolved by coating of the above-mentioned composition for forming an anisotropic light-absorbing film, and to have resistance to removal of a solvent or heat treatment for alignment of a polymerizable liquid crystal compound. heat resistance. As the alignment film, an alignment film containing an alignment polymer, a photo-alignment film, etc. can be mentioned. Specifically, for example, an alignment film containing an alignment polymer described in Japanese Patent Laid-Open No. 2016-27387 can be used. or photoalignment film. In one embodiment of the present invention, the light-absorbing anisotropic film is laminated adjacent to the first anti-diffusion layer. That is, in this embodiment, there is no alignment film between the light-absorbing anisotropic film and the first diffusion prevention layer.

The first diffusion prevention layer can be formed by the method described above as the formation method of the diffusion prevention layer. The first anti-diffusion layer can also be formed on the film substrate. As the base film, a previously known resin film base in the field of optical films can be used. When the light-absorbing anisotropic plate of the present invention is assembled in other optical laminates or display devices, etc., the film base is transferred to In the case of printing without peeling off, it is preferably a transparent resin film substrate. Transparent resin film substrate refers to a film substrate with light transmittance that allows light, especially visible light, to pass through. Light transmittance refers to the corrected transmittance of 80% or more for light with a wavelength of 380 nm to 780 nm. characteristics.

Examples of the resin constituting the film substrate include: polyolefin-based resins such as polyethylene and polypropylene; cyclic olefin-based resins such as northene-based polymers; polyethylene terephthalate, polyethylene naphthalate, etc. Polyester-based resins such as ethylene glycol; poly(meth)acrylic resins such as (meth)acrylic acid and polymethyl(meth)acrylate; triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate Such as cellulose ester resins; vinyl alcohol resins such as polyvinyl alcohol and polyvinyl acetate; polycarbonate resins; polystyrene resins; polyarylate resins; polysulfide resins; polyether resins; Polyamide-based resins; polyimide-based resins; polyetherketone-based resins; polyphenylene sulfide-based resins; polyphenylene ether-based resins and their mixtures, etc. Among them, at least one selected from the group consisting of polyimide resins, cellulose ester resins, cyclic olefin resins, polyester resins, and poly(meth)acrylic resins is preferable. These may be used alone or in combination of two or more. Such a resin can be formed into a film by a known method such as a solvent casting method and a melt extrusion method to obtain a resin film base material.

Commercially available items can be used as the film base material or the resin constituting the film base material. Examples of commercially available cellulose ester-based resin film substrates include Fujitac Film (manufactured by Fuji Film Co., Ltd.); KC8UX2M, KC8UY, and KC4UY (manufactured by Konica Minolta Optical Co., Ltd.). Commercially available cyclic olefin resins include, for example, Topas (registered trademark) (manufactured by Ticona Co., Ltd.), Artone (registered trademark) (manufactured by JSR Co., Ltd.), ZEONOR (registered trademark), ZEONEX (registered trademark) (manufactured by ZEON Co., Ltd.), APEL (registered trademark) (manufactured by Mitsui Chemicals Co., Ltd.), etc. Such a cyclic olefin-based resin can be formed into a film by a known method such as a solvent casting method and a melt extrusion method to obtain a film base material. Commercially available cyclic olefin-based resin substrates include, for example, S-SINA (registered trademark), SCA40 (registered trademark) (manufactured by Sekisui Chemical Co., Ltd.), Zeonor Film (registered trademark) (Optes Co., Ltd. Co., Ltd.), Artone Film (registered trademark) (manufactured by JSR Co., Ltd.), etc.

Surface treatments may be applied to the film substrate. As the method of surface treatment, for example, the method of treating the surface of the film base material by corona or plasma under the atmosphere of vacuum to atmospheric pressure, the method of performing laser treatment on the surface of the film base material, the method of treating the surface of the film base material, The method of ozone treatment on the surface of film substrate, the method of saponification treatment on the surface of film substrate, the method of flame treatment on the surface of film substrate, the method of coating coupling agent on the surface of film substrate, the method of film substrate The method of priming the surface of the substrate, and the graft polymerization method of attaching a reactive monomer or a reactive polymer to the surface of the film substrate and then irradiating it with radiation, plasma or ultraviolet rays to make it react, etc. Among them, the method of performing corona or plasma treatment on the surface of the film substrate in an atmosphere ranging from vacuum to atmospheric pressure is preferred.

As the method of carrying out the surface treatment of the film substrate by corona or plasma, the following method can be mentioned: under the pressure near the atmospheric pressure, the film substrate is placed between the electrodes facing each other, and the corona or plasma is generated, thereby Surface treatment of the film substrate; flow gas between the electrodes facing each other, plasmaize the gas between the electrodes, and blow the plasmaized gas to the film substrate; and generate glow discharge plasma under low pressure conditions And carry out the surface treatment of the film substrate; etc.

Among them, the following methods are preferred: under a pressure near the atmospheric pressure, a film substrate is placed between opposing electrodes, and corona or plasma is generated to perform surface treatment of the film substrate; or gas is flowed between the opposing electrodes. , The gas is plasmaized between the electrodes, and the plasmaized gas is blown to the film substrate. The surface treatment using corona or plasma is usually performed with a commercially available surface treatment device.

The film substrate may be a layer constituting the light-absorption anisotropic plate of the present invention, or may be finally peeled off.

The film substrate may have a protective film on the surface opposite to the surface on which the first curable composition for diffusion prevention layer formation is applied. The protective film may, for example, be a film of polyethylene, polyethylene terephthalate, polycarbonate or polyolefin, or a film having an adhesive layer on the film. Among them, polyethylene terephthalate is preferred because of its small thermal deformation during drying. By having a protective film on the surface opposite to the surface on which the curable composition for forming the first diffusion-preventing layer is applied, it is possible to suppress shaking of the film or slight vibration of the application surface when the film substrate is transported, and improve the coating performance. uniformity of the film.

The thickness of the film substrate is preferably thinner from the viewpoint of practical handling, but thicker from the viewpoint of strength or workability. In one aspect of the present invention, the thickness of the film substrate is preferably 5 μm-300 μm, more preferably 20 μm-200 μm.

When the light-absorption anisotropic film-forming composition contains a solvent, the solvent is usually removed from the applied composition. The method for removing the solvent may, for example, be a natural drying method, a ventilation drying method, a heat drying method, or a reduced-pressure drying method. The dried coating film is preferably dried so that the residual solvent in the light-absorbing anisotropic film becomes 1% by weight or less with respect to the total mass of the light-absorbing anisotropic film. The amount of the remaining solvent can be quantified by peeling and weighing the light-absorbing anisotropic film from the first diffusion prevention layer, etc., and immersing the obtained light-absorbing anisotropic film in tetrahydrofuran or the like to dissolve the light-absorbing anisotropic film. After irradiating ultrasonic waves in the solvent of the film for 10 minutes to extract the dissolved components, the solution was analyzed by gas chromatography. Conditions such as drying temperature and drying time can be appropriately determined according to the composition of the light-absorption anisotropic film-forming composition, the material of the first diffusion preventing layer, and the like.

The polymerizable liquid crystal compound in the coating film is usually aligned with the dichroic pigment to form a liquid crystal phase by heating to a temperature above the temperature at which it is transformed into a liquid crystal state or a solution state, and then cooling to a temperature at which liquid crystals are aligned.

The temperature at which the polymerizable liquid crystal compound is aligned in the coating film can be determined in advance by observing the texture of a composition containing the polymerizable liquid crystal compound. Moreover, removal of a solvent and alignment of a liquid crystal can be performed simultaneously. The temperature at this time depends on the solvent to be removed or the type of polymerizable liquid crystal compound to be used, but is preferably in the range of 50 to 200°C, more preferably in the range of 80 to 130°C.

The light-absorbing anisotropic film is formed by polymerizing the polymerizable liquid crystal compound while maintaining the liquid crystal state of the polymerizable liquid crystal compound and curing it to form a cured film of the liquid crystal composition. As the polymerization method, a photopolymerization method is preferable. In photopolymerization, as the light irradiated to the dry coating film, it depends on the type of polymerizable liquid crystal compound, polymerizable non-liquid crystal compound, etc. contained in the dry coating film (especially polymerizable liquid crystal/non-liquid crystal The type of the active group), the type of the polymerization initiator and the amount thereof are appropriately selected. The liquid crystal cured film comprising a polymerizable liquid crystal compound polymerized in a state of maintaining a smectic liquid crystal phase is compared with the previous host-guest type liquid crystal cured film, that is, polymerizable liquid crystal compounds etc. are made in a state of maintaining a nematic liquid crystal phase The cured liquid crystal film obtained by polymerization has higher polarizing performance than that obtained by coating only a dichroic dye or a lyotropic liquid crystal, and has excellent polarizing performance and film strength.

As the light source of active energy rays, the same ones as those exemplified as being usable for curing the curable composition for forming a diffusion preventing layer may be mentioned. The irradiation energy of active energy rays is preferably set so that the irradiation intensity in the wavelength region effective for activation of the polymerization initiator is 10 to 5000 mJ/cm ² , more preferably 100 to 2000 mJ/cm ² .

The light absorption of the present invention can be obtained by forming the second anti-diffusion layer on the surface of the light-absorbing anisotropic film opposite to the first anti-diffusion layer by the method described above as the method for forming the anti-diffusion layer. Anisotropic plates.

Also, when the second diffusion prevention layer is an adhesive layer, the curable composition for forming the second diffusion prevention layer can be formed by coating the curable composition for forming the second diffusion prevention layer on the film substrate. After bonding the coating film side of the object and the surface of the light-absorbing anisotropic film opposite to the first diffusion prevention layer, the curable composition is cured by irradiating active energy rays. As the film base material, the above-mentioned film base material can be used.

The light-absorbing anisotropic sheet of the present invention can be expected to have high optical characteristics because it prevents the diffusion of dichroic dyes and suppresses interference spots, and is suitable for use as a structure of a liquid crystal display device or an organic electroluminescence (EL) display device, etc. Material. Therefore, the present invention also targets a display material including the light-absorption anisotropic sheet of the present invention, and a display device including the light-absorption anisotropic sheet of the present invention.

The light-absorbing anisotropic sheet of the present invention can be used, for example, as a privacy film or as a material for improving the appearance of a display. In addition, the light-absorbing anisotropic plate of the present invention is also suitable as a flexible display material because of its excellent polarizing performance and excellent flexibility.

When used as a display material to be assembled in a display device, specifically, for example, it can be attached to the viewing side of a circular polarizing plate through an adhesive layer. Polarizing film or retardation film with polarizing function.

As a display device, it is a device that has a display element and includes a light-emitting element or a light-emitting device as a light-emitting source, such as a liquid crystal display device, an organic electroluminescence (EL) display device, an inorganic electroluminescence (EL) display device, Touch panel display devices, electron emission display devices (such as field emission display devices (FED), surface field emission display devices (SED)), electronic paper (display devices using electronic ink or electrophoretic elements), plasma display devices, projection Type display devices (such as grid light valve imaging system (GLV) display devices, display devices with digital micromirror devices (DMD)) and piezoelectric ceramic displays.

Various materials and members constituting the display device, such as a polarizing film or a retardation film having a polarization function having an absorption axis in a direction parallel to the film surface, can be appropriately selected and used according to known materials or members used in display devices. [Example]

Hereinafter, the present invention will be described in further detail with examples and comparative examples. Unless otherwise specified, "%" and "part" in an Example and a comparative example are "mass %" and "mass part".

1. Embodiment 1 (1) Preparation of light absorption anisotropic film-forming composition The composition for light absorption anisotropic film formation was obtained by mixing the following components, and stirring at 80 degreeC for 1 hour. As the dichroic dye, the azo dye described in the Examples of JP-A-2013-101328 was used.

・式(A-7)所表示之聚合性液晶化合物 25份 [化18]

・下述所示之二色性色素(1)(極大吸收波長：602 nm) 1份 [化19]

・聚合起始劑：2-二甲胺基-2-苄基-1-(4-𠰌啉基苯基)丁烷-1-酮(Irgacure 369，汽巴精化股份有限公司製造)   6份 ・調平劑：F-556(Megafac F-556，DIC(股)製造) 1份 ・溶劑：鄰二甲苯   650份 ・75 parts of polymerizable liquid crystal compound represented by formula (A-6) [Chem. 17]

・25 parts of polymerizable liquid crystal compound represented by formula (A-7) [Chem. 18]

・1 part of the following dichroic dye (1) (maximum absorption wavelength: 602 nm) [Chemical 19]

・Polymerization initiator: 2-dimethylamino-2-benzyl-1-(4-?olinylphenyl)butan-1-one (Irgacure 369, manufactured by Ciba Specialty Chemicals Co., Ltd.) 6 parts・Leveling agent: F-556 (Megafac F-556, manufactured by DIC Co., Ltd.) 1 part ・Solvent: 650 parts of o-xylene

(2) Preparation of curable composition (X) for forming a diffusion prevention layer The curable composition (X) for diffusion prevention layer formation was prepared by mixing the following components, and stirring at 80 degreeC for 1 hour. ・Acrylic compound: dipentaerythritol hexaacrylate 50 parts ・Urethane acrylate compound: urethane acrylate (manufactured by DAICEL-ALLNEX Co., Ltd., "Ebecryl 4858") 50 parts ・Radical polymerization initiator: 2-[4-(methylthio)benzoyl]-2-(4-𠰌linyl)propane (manufactured by BASF Corporation, "Irgacure 907") 3 parts ・Solvent: 10 parts of methyl ethyl ketone

(3) Production of the first anti-diffusion layer Corona is applied to the release-treated surface of the polyethylene terephthalate film (SP-PLR382050 manufactured by Lintec Co., Ltd.) (release film) after the release treatment. After the treatment, apply the curable composition (X) for forming the first diffusion prevention layer by bar coating method (#2 30 mm/s) as the curable composition for the formation of the first diffusion prevention layer, and use UV (Ultraviolet , ultraviolet) irradiation device (SPOT CURE SP-7, manufactured by Ushio Electric Co., Ltd.), irradiating ultraviolet rays with an exposure amount of 500 mJ/cm ² (365 nm basis) to the curable composition (X) for forming a diffusion prevention layer A coating film, thereby obtaining a release film with an anti-diffusion layer in which a first anti-diffusion layer comprising a curable resin (1) is formed on the surface of the release film. The thickness of the first anti-diffusion layer measured by a contact film thickness gauge was 2 μm. (4) Production of light-absorbing anisotropic film using a bar coater to coat the above-mentioned light-absorbing anisotropic film-forming composition on the surface of the above-mentioned first diffusion prevention layer, and then place in a drying oven set at 100°C Let dry for 1 minute.

Then, by using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by Ushio Electric Co., Ltd.), irradiate ultraviolet rays (under a nitrogen atmosphere, wavelength: 365 nm, cumulative light intensity at 365 nm: 1000 mJ/cm ² ), A light-absorbing anisotropic film in which the polymerizable liquid crystal compound and the dichroic pigment are vertically aligned with respect to the plane of the coating film is formed to obtain a laminate (1) comprising a release film/first diffusion prevention layer/light-absorbing anisotropic film. At this time, when the thickness of the light-absorbing anisotropic film was measured with an ellipsometer, it was 0.4 μm.

(5) Production of the second anti-diffusion layer Corona treatment was performed on the surface of the light-absorbing anisotropic film of the laminate (1) obtained in the above-mentioned manner, and bar coating method (#2 30 mm/s) was used. The curable composition (X) for forming the diffusion prevention layer was applied as the second curable composition for the formation of the diffusion prevention layer, and the exposure amount was adjusted using a UV irradiation device (SPOT CURE SP-7, manufactured by Ushio Electric Co., Ltd.). Ultraviolet rays of 500 mJ/cm ² (based on 365 nm) were irradiated on the coating film of the curable composition (X) for forming a diffusion preventing layer, thereby obtaining a second diffusion preventing layer comprising a curable resin (1). As a result, a laminate (2) comprising a release film/first diffusion prevention layer/light absorption anisotropic film/second diffusion prevention layer was obtained. Then, by peeling off the release film from the laminate (2), an anisotropic light absorption sheet (1) comprising the first diffusion prevention layer/light absorption anisotropic film/second diffusion prevention layer was obtained. Furthermore, the thickness of the second diffusion prevention layer measured by a contact film thickness gauge was 2 μm.

(6) Characteristic evaluation [Evaluation of Refractive Index] The average refractive index at a wavelength of 589 nm of the diffusion prevention layer and the light-absorbing anisotropic film was measured using a refractometer ("multi-wavelength Abbe refractometer DR-M4" manufactured by Atago Co., Ltd.).

[Evaluation of interference spots] The light-absorbing anisotropic plate (1) (80 mm×80 mm) produced above was bonded to the aluminum reflector plate via an acrylic adhesive (film thickness 25 μm), and placed obliquely from the front under a 3-wavelength fluorescent lamp. The direction was obliquely observed visually, and it evaluated based on the following reference|standard. The results are shown in Table 1. ＜Evaluation criteria＞ A: The interference spot is not recognized B: Interference spots are slightly recognized C: Visual recognition of interference spots D: Clearly recognize interference spots E: Interference spots are clearly recognized

[Evaluation of migration] On both sides of the light-absorbing anisotropic plate (1) produced above, a cycloolefin polymer film was attached via an acrylic adhesive (film thickness 25 μm), and the initial polarization performance (polarization degree Py, monomer transmittance Ty ), after 120 hours at 100°C, measure again to measure the change of polarization degree. The results are shown in Table 1. ＜Evaluation criteria＞ A: The degree of polarization does not change by 2% B: The change in degree of polarization is 2% or more and less than 5% C: The degree of polarization changes by more than 5%

2. Embodiment 2 (1) Preparation of a resin composition containing a water-soluble polymer for forming an anti-diffusion layer Add 7 parts of carboxy-modified polyvinyl alcohol ["KURARAY POVAL KL318" manufactured by Kuraray Co., Ltd.] to 100 parts of water, and 3.5 parts of water-soluble polyamide epoxy resin as a thermal crosslinking agent [from "Sumirez Resin 650" obtained from Sumika Chemtex Co., Ltd. (an aqueous solution with a solid content concentration of 30% by mass)] was mixed to prepare a resin composition (viscosity: 92 cP) containing a water-soluble polymer for forming an anti-diffusion layer.

(2) Production of light-absorbing anisotropic plates The difference in light absorption was obtained in the same manner as in Example 1, except that the above-mentioned resin composition containing a water-soluble polymer was used instead of the curable composition (X) for forming a diffusion prevention layer, and the second diffusion prevention layer was produced in the following manner. An anisotropic plate (2) comprising a first diffusion prevention layer comprising a curable resin (1)/light-absorbing anisotropic film/a second diffusion prevention layer comprising a water-soluble polymer (1). <Formation method of the second anti-diffusion layer> The above-mentioned resin composition containing a water-soluble polymer was coated on the light-absorbing anisotropic film produced in the same procedure as in Example 1 by a wire bar coater (#30). Next, the above-mentioned aqueous solution was dried by drying the coating film at 80° C. for 5 minutes to form a second diffusion preventing layer. The thickness of the second diffusion prevention layer measured by a contact film thickness gauge was 1 μm. With regard to the obtained light-absorption anisotropic sheet (2), characteristic evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

3. Embodiment 3 (1) Preparation of curable composition (Y) for forming a diffusion prevention layer After mixing the cationically polymerizable compound and the cationic polymerization initiator described below, defoaming was performed to prepare a cationically polymerizable curable composition (Y) for forming a diffusion preventing layer. In addition, the cationic polymerization initiator was prepared as a 50% by mass propylene carbonate solution, and the solid content thereof was shown. ・1,6-Hexanediol diglycidyl ether (trade name: EX-212L, manufactured by Nagase Chemical Co., Ltd.) 25 parts ・10 parts of 4-hydroxybutyl vinyl ether ・Bisphenol F-type epoxy resin (trade name: EXA-830CRP, manufactured by DIC Co., Ltd.) 65 parts ・Cationic polymerization initiator (trade name: CPI-100P, manufactured by San-Apro Co., Ltd., 50% by mass solution) 3 parts

(2) Production of light-absorbing anisotropic plates Except that the curable composition (Y) for forming a diffusion prevention layer is used instead of the curable composition (X) for formation of a diffusion prevention layer, and the second diffusion prevention layer containing the curable resin (2) is produced in the following manner, In the same manner as in Example 1, a light-absorption anisotropic plate (3) was obtained, which contained a first diffusion prevention layer comprising a curable resin (1)/light-absorption anisotropic film/a second layer comprising a curable resin (2). Second anti-diffusion layer. <Formation method of the second anti-diffusion layer> On the light-absorbing anisotropic film produced in the same procedure as in Example 1, under the same conditions as in Example 1, a second diffusion preventing layer containing a curable resin (2) was formed. The thickness of the second diffusion prevention layer measured by a contact film thickness gauge was 1.8 μm. With regard to the obtained light-absorption anisotropic sheet (3), characteristic evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

4. Embodiment 4 In addition to changing the type and compounding amount of the leveling agent, the compounding amount of the solvent, and the film thickness of the light-absorbing anisotropic film as shown in Table 1 in the composition for forming the light-absorbing anisotropic film, the same method as in Example 3 Obtain the light-absorption anisotropic plate (4) in the same manner, which contains the first diffusion prevention layer comprising curable resin (1)/light absorption anisotropic film/second diffusion prevention layer comprising curable resin (2) . Furthermore, BYK-361N (BYK Chemie) was used as a leveling agent. With regard to the obtained light-absorption anisotropic sheet (4), characteristic evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

5. Example 5 In the same manner as in Example 3, except that the dichroic dye (2) shown below was used instead of the dichroic dye (1) in the light-absorbing anisotropic film-forming composition A light-absorption anisotropic plate (5) comprising a first diffusion prevention layer comprising curable resin (1)/light absorption anisotropic film/second diffusion prevention layer comprising curable resin (2) was obtained. With regard to the obtained light-absorption anisotropic sheet (5), characteristic evaluation was performed in the same manner as in Example 1. The results are shown in Table 1. Dichroic pigment (2) (maximum absorption wavelength: 522 nm) [Chem. 20]

6. Example 6 In the same manner as in Example 3, except that the dichroic dye (3) shown below was used instead of the dichroic dye (1) in the light-absorbing anisotropic film-forming composition A light-absorption anisotropic plate (6) comprising a first diffusion prevention layer comprising curable resin (1)/light absorption anisotropic film/second diffusion prevention layer comprising curable resin (2) was obtained. With regard to the obtained light-absorption anisotropic sheet (6), characteristic evaluation was performed in the same manner as in Example 1. The results are shown in Table 1. Dichroic pigment (3) (maximum absorption wavelength: 468 nm) [Chem. 21]

7. Embodiment 7 Dichroic dye (1) (2.5 parts), dichroic dye (2) (2.5 parts) and dichroic dye (3) (2.5 parts) are used in the light absorption anisotropic film-forming composition Except for the dichroic dye (1), in the same manner as in Example 3, a light-absorption anisotropic plate (7) containing a first diffusion prevention layer/light-absorption anisotropy comprising a curable resin (1) was obtained. Film/Second Diffusion Prevention Layer Containing Curable Resin (2). Regarding the obtained light-absorption anisotropic sheet ( 7 ), characteristic evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

8. Comparative example 1 Except that the second anti-diffusion layer was not prepared, a light-absorption anisotropic plate (8) was obtained in the same manner as in Example 1, which contained the first anti-diffusion layer/light-absorption anisotropic membrane. With regard to the obtained light-absorption anisotropic sheet (8), characteristic evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

9. Comparative example 2 A light-absorption anisotropic plate (9) including a light-absorption anisotropic film was obtained in the same manner as in Example 1 except that the first and second diffusion prevention layers were not formed. With regard to the obtained light-absorption anisotropic sheet (9), characteristic evaluation was carried out in the same manner as in Example 1. The results are shown in Table 1.

10. Comparative example 3 Obtained a light-absorption anisotropic plate (10) containing a first diffusion prevention layer/light-absorption anisotropic film comprising the water-soluble polymer (2) described in Example 1 of Japanese Patent Laid-Open No. 2017-83843 (horizontal alignment type)/Second diffusion prevention layer comprising a water-soluble polymer (2). The thicknesses of the first anti-diffusion layer and the second anti-diffusion layer measured by a contact film thickness gauge were 1 μm, respectively. Regarding the obtained light-absorption anisotropic sheet (10), characteristic evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

11. Comparative example 4 Except for using the light-absorption anisotropic film of Example 1 as the light-absorption anisotropy film, a light-absorption anisotropic plate (11) containing a water-soluble polymer (2) was obtained in the same manner as in Comparative Example 3. The first anti-diffusion layer/light-absorbing anisotropic film/the second anti-diffusion layer comprising a water-soluble polymer (2). Regarding the obtained light-absorption anisotropic sheet (11), characteristic evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

[Table 1] first anti-diffusion layer Second anti-diffusion layer Light absorption anisotropic film Characteristic evaluation polymerizable liquid crystal compound polymerization initiator leveling agent dichroic pigment solvent n _{λ xy} n _{λ z} Thickness (μm) interference spot Migration type n _{λ a} type n _{λ b} type type type type type thickness thickness ratio (parts by mass) (parts by mass) (parts by mass) (parts by mass) Example 1 hardening resin (1) 1.53 hardening resin (1) 1.53 (A-6): (A-7) Irg. 369 F-556 (1) O-xylene 1.48 1.61 0.4 A B 2 μm 2 μm 75:25 6 1 2.5 650 Example 2 hardening resin (1) 1.53 Water Soluble Polymers (1) 1.53 (A-6): (A-7) Irg. 369 F-556 (1) O-xylene 1.48 1.61 0.4 B A 2 μm 1 μm 75:25 6 1 2.5 650 Example 3 hardening resin (1) 1.53 hardening resin (2) 1.55 (A-6): (A-7) Irg. 369 F-556 (1) O-xylene 1.48 1.61 0.4 A A 2 μm 1.8 μm 75:25 6 1 2.5 650 Example 4 hardening resin (1) 1.53 hardening resin (2) 1.55 (A-6): (A-7) Irg. 369 BYK-361N (1) O-xylene 1.48 1.61 1.2 B A 2 μm 1.8 μm 75:25 6 0.3 2.5 250 Example 5 hardening resin (1) 1.53 hardening resin (2) 1.55 (A-6): (A-7) Irg. 369 F-556 (2) O-xylene 1.51 1.62 0.4 B B 2 μm 1.8 μm 75:25 6 1 2.5 650 Example 6 hardening resin (1) 1.53 hardening resin (2) 1.55 (A-6): (A-7) Irg. 369 F-556 (3) O-xylene 1.52 1.65 0.4 B 8 2 μm 1.8 μm 75:25 6 1 2.5 650 Example 7 Hardening resin⑴ 1.53 hardening resin (2) 1.55 (A-6): (A-7) Irg. 369 F-556 (1), (2), (3) O-xylene 1.48 1.55 0.4 C B 2 μm 1.8 μm 75:25 6 1 2.5 each 650 Comparative example 1 Hardening resin⑴ 1.53 none - (A-6): (A-7) Irg. 369 F-556 (1) O-xylene 1.48 1.61 0.4 A C 2 μm 75:25 6 1 2.5 650 Comparative example 2 none - none - (A-6): (A-7) Irg. 369 F-556 (1) O-xylene 1.48 1.61 0.4 A C 75:25 6 1 2.5 650 Comparative example 3 Water Soluble Polymers (2) 1.47 Water Soluble Polymers (2) 1.47 (A-6): (A-7) Irg. 369 BYK-361N (1), (2), (3) O-xylene 1.55 1.48 1.2 E. A 1 μm 1 μm 75:25 6 1.2 2.5 each 250 Comparative example 4 Water Soluble Polymers (2) 1.47 Water Soluble Polymers (2) 1.47 (A-6): (A-7) Irg. 369 F-556 (1) O-xylene 1.48 1.61 0.4 E. A 1 μm 1 μm 75:25 6 1 2.5 650

Claims (15)

A light-absorbing anisotropic plate, which is obtained by laminating a first anti-diffusion layer adjacent to one side of the light-absorbing anisotropic film with or without an alignment film, and laminating a second anti-diffusion layer adjacent to the other side, And the thicknesses of the first anti-diffusion layer and the second anti-diffusion layer are 0.05 μm to 5 μm respectively, and the light-absorbing anisotropic film is a polymerizable liquid crystal compound and a dichroic pigment so that the light-absorbing anisotropic film is The cured film obtained by curing the state aligned in the direction perpendicular to the plane, the refractive index of the first diffusion prevention layer, the second diffusion prevention layer and the light absorption anisotropic film satisfies at least 1 of formula (1) and formula (2) or: n _λxy ≦n _λa ≦n _λz (1) n _λxy ≦n _λb ≦n _λz (2) [In formula (1) and formula (2), n _λ represents the anti-diffusion layer or light absorption at a wavelength of 589 nm Refractive index n of the anisotropic film, n _λa represents n λ of the first anti-diffusion layer, n _λb represents n _λ of the second anti-diffusion layer, n _λxy represents the _value in the direction parallel to the film plane of the light-absorbing anisotropic film n _λ , n _λz represent n _λ ] in the direction perpendicular to the film plane of the light-absorbing anisotropic film. The light-absorbing anisotropic plate according to claim 1, wherein the thickness of at least one of the first anti-diffusion layer and the second anti-diffusion layer is not less than 0.05 μm and not more than 3 μm. The light-absorbing anisotropic sheet according to claim 1 or 2, wherein either one of the first diffusion prevention layer and the second diffusion prevention layer is a hardened layer of a cationic polymerizable curable composition. The light-absorbing anisotropic sheet according to claim 3, wherein the cationically polymerizable curable composition contains an epoxy compound. The light-absorbing anisotropic sheet according to any one of claims 1 to 4, wherein either one of the first diffusion prevention layer and the second diffusion prevention layer is a hardened layer of a radically polymerizable curable composition. The light-absorption anisotropic plate according to any one of claims 1 to 5, wherein the radical polymerizable curable composition contains a polyfunctional (meth)acrylate compound. The light absorption anisotropic sheet according to any one of Claims 1 to 6, wherein any one of the first diffusion prevention layer and the second diffusion prevention layer is an adhesive layer. The light absorption anisotropic sheet according to any one of claims 1 to 7, wherein the polymerizable liquid crystal compound is a liquid crystal compound exhibiting a smectic liquid crystal phase. The light-absorbing anisotropic sheet according to any one of claims 1 to 8, wherein the dichroic dye is an azo dye. The light-absorption anisotropic plate according to any one of Claims 1 to 9, wherein the light-absorption anisotropy film has maximum absorption at a wavelength between 550 μm and 700 nm. The light-absorption anisotropic plate according to any one of claims 1 to 10, wherein the thickness of the light-absorption anisotropy film is not less than 0.1 μm and not more than 2 μm. The light-absorption anisotropic sheet according to any one of claims 1 to 11, wherein the light-absorption anisotropy film shows a Buhlerg peak in X-ray diffraction measurement. A manufacturing method, which is a method of manufacturing a light-absorbing anisotropic plate formed by laminating a first anti-diffusion layer on one side of the light-absorbing anisotropic film with or without an alignment film, and a second anti-diffusion layer on the other side, It includes the following steps: (i) forming a coating film of a liquid crystal composition comprising a polymerizable liquid crystal compound and a dichroic pigment on the first diffusion prevention layer; (ii) drying the obtained coating film to obtain a dry coating film; (iii) hardening the coating film in a state where the polymerizable liquid crystal compound and the dichroic dye are aligned in a direction perpendicular to the plane of the coating film to form an anisotropic light-absorbing film; and (iv) A second diffusion prevention layer is formed on the surface of the formed light-absorption anisotropic film opposite to the first diffusion prevention layer. A display material comprising the light-absorbing anisotropic plate according to any one of Claims 1 to 12. A display device comprising the light absorption anisotropic plate according to any one of Claims 1 to 12.