Optical laminate and display device using same

Abstract

Provided is a composition for forming a colored layer, the composition containing a dye (A), a photopolymerizable compound (B), a photoinitiator (C), an additive (D), and an organic solvent (E). The photopolymerizable compound (B) contains: one or more types of monomers (X) selected from the group consisting of caprolactone-modified (meth)acrylates, urethane (meth)acrylates, and ethylene oxide-modified (meth)acrylates; and a bifunctional (meth)acrylate monomer (Y).

Description

Optical laminate and display device using the same

[0001] This disclosure relates to an optical laminate and a display device using the same. This application claims priority under Japanese Patent Application No. 2025-000094, filed in Japan on January 6, 2025, the contents of which are incorporated herein by reference.

[0002] Generally, the electrodes and many other metal wirings in organic light-emitting devices have a problem where external light reflection causes poor display of black and poor contrast. To solve this problem, there is a configuration in which polarizing plates and phase delay plates are placed on the organic light-emitting element to suppress external light reflection.

[0003] However, the method using polarizers and phase delay plates has the problem that a considerable portion of the light generated from the organic light-emitting layer is lost when it passes through the polarizers and phase delay plates and is emitted to the outside. Another invention discloses a method to suppress the reflection of external light and improve visibility by selectively absorbing external light for each wavelength band and adjusting the transmittance, thereby minimizing the loss of light emitted to the outside from the organic light-emitting element (Patent Document 1).

[0004] Furthermore, in order to improve color purity and enhance RGB color separation, a configuration is disclosed that includes a dye having an absorption maximum wavelength in at least the wavelength regions of 480-510 nm and 580-610 nm (Patent Document 2).

[0005] Furthermore, with the increasing adoption of flexible displays in recent years, the materials used to form these displays are increasingly required to have not only the optical properties and durability that have been traditionally demanded, but also flexibility. Unlike polarizing plates, which are difficult to thin due to their own thickness, optical filters, which can be formed by adding them to a functional layer, are highly compatible with flexible displays.

[0006] Japanese Patent Publication No. 5673713, Japanese Unexamined Patent Publication No. 2019-56865

[0007] A hard coat film with surface protection properties and flexibility is used on the surface of a flexible display. When adding an optical filter layer (colored layer) that selectively absorbs a predetermined wavelength band to such a hard coat film, the colored layer is provided in such a layer configuration from the inside out, for example, colored layer / substrate / functional layer, or colored layer / functional layer / substrate / functional layer, taking into account reliability such as light resistance and heat resistance. However, as shown in Figure 2, conventional optical films tend to develop fine cracks in the outermost colored layer at the bend, even at relatively large radii of curvature, when bent so that the radius of curvature gradually decreases. When considering application to bendable and foldable display devices, the optical film needs to be less prone to defects even when bent at small radii of curvature. Furthermore, scratch resistance is a trade-off when increasing flexibility, requiring rigorous formulation design.

[0008] Therefore, the present disclosure aims to provide an optical laminate and a display device using the same, which can be suitably used as a component of a flexible display or the like, achieving both flexibility and scratch resistance, which are in a trade-off relationship, and which are less prone to defects even when bent with a small radius of curvature.

[0009] The present disclosure has the following embodiments: <1> A colored layer forming composition comprising a dye (A), a photopolymerizable compound (B), a photopolymerization initiator (C), an additive (D), and an organic solvent (E), wherein the photopolymerizable compound (B) comprises one or more monomers (X) selected from the group consisting of caprolactone-modified (meth)acrylate, urethane (meth)acrylate, and ethylene oxide-modified (meth)acrylate, and a bifunctional (meth)acrylate monomer (Y), and the additive (D) comprises a polymer containing a structural unit represented by the following formula (1) as a radical scavenger, for the colored layer forming composition. In formula (1), R ａR represents a hydrogen atom, halogen atom, carboxyl group, sulfo group, cyano group, hydroxyl group, alkyl group having 10 or fewer carbon atoms, alkoxycarbonyl group having 10 or fewer carbon atoms, alkylsulfonylaminocarbonyl group having 10 or fewer carbon atoms, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 or fewer carbon atoms, alkoxy group having 10 or fewer carbon atoms, alkylthio group having 10 or fewer carbon atoms, aryloxy group having 10 or fewer carbon atoms, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 or fewer carbon atoms, acyl group having 10 or fewer carbon atoms, carbamoyl group, sulfamoyl group, aryl group having 10 or fewer carbon atoms, substituted amino group, substituted ureido group, substituted phosphono group, or heterocyclic group. ｂ <1> The colored layer-forming composition according to <1>, wherein the monomer (X) represents a hydrogen atom or an alkyl group having 30 or fewer carbon atoms, and X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or fewer carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by a combination thereof, and all may contain a spirodioxane ring. <2> The content of the monomer (X) is 30 to 45% by mass with respect to the total mass of solids of the composition, the content of the monomer (Y) is 35 to 50% by mass with respect to the total mass of solids of the composition, and the content of the additive (D) is 10 to 25% by mass with respect to the total mass of solids of the composition. <3> The colored layer-forming composition according to <1> or <2>, wherein the monomer (X) comprises one or more monomers selected from the group consisting of a monomer represented by the following formula (x1), a monomer represented by the following formula (x2), and a mixture of monomers represented by the following formula (x3). <4> The colored layer forming composition according to any one of <1> to <3>, wherein the monomer (Y) comprises a monomer represented by the following formula (y1). In formula (y1), s is a number from 1 to 6. <5> A colored layer forming composition comprising a dye (A), a photopolymerizable compound (B), a photopolymerization initiator (C), an additive (D), and an organic solvent (E), wherein the photopolymerizable compound (B) comprises one or more monomers (X) selected from the group consisting of caprolactone-modified (meth)acrylate, urethane (meth)acrylate, and ethylene oxide-modified (meth)acrylate, and a bifunctional (meth)acrylate monomer (Y), the additive (D) comprises a polymer containing a structural unit represented by the following formula (1) as a radical scavenger, the content of monomer (X) is 30 to 45% by mass with respect to the total mass of solids of the composition, the content of monomer (Y) is 35 to 50% by mass with respect to the total mass of solids of the composition, and the content of additive (D) is 10 to 25% by mass with respect to the total mass of solids of the composition. A colored layer forming composition wherein the monomer (X) comprises one or more monomers selected from the group consisting of a monomer represented by the following formula (x1), a monomer represented by the following formula (x2), and a mixture of monomers represented by the following formula (x3), and the monomer (Y) comprises a monomer represented by the following formula (y1). In formula (1), R ａ R represents a hydrogen atom, halogen atom, carboxyl group, sulfo group, cyano group, hydroxyl group, alkyl group having 10 or fewer carbon atoms, alkoxycarbonyl group having 10 or fewer carbon atoms, alkylsulfonylaminocarbonyl group having 10 or fewer carbon atoms, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 or fewer carbon atoms, alkoxy group having 10 or fewer carbon atoms, alkylthio group having 10 or fewer carbon atoms, aryloxy group having 10 or fewer carbon atoms, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 or fewer carbon atoms, acyl group having 10 or fewer carbon atoms, carbamoyl group, sulfamoyl group, aryl group having 10 or fewer carbon atoms, substituted amino group, substituted ureido group, substituted phosphono group, or heterocyclic group. ｂrepresents a hydrogen atom or an alkyl group having 30 or fewer carbon atoms, X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or fewer carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by combining these, and any of them may contain a spirodioxane ring. In formula (y1), s is a number from 1 to 6. <6> The coloring agent (A) contains one or more selected from the group consisting of a first colorant, a second colorant, and a third colorant. The first colorant has an absorption maximum wavelength within the range of 470 to 530 nm and a half-value width of the absorption spectrum of 15 to 45 nm. The second colorant has an absorption maximum wavelength within the range of 560 to 620 nm and a half-value width of the absorption spectrum of 15 to 55 nm. The third colorant has the wavelength with the lowest transmittance within the range of 650 to 780 nm in the wavelength range of 380 to 780 nm. The composition for forming a colored layer according to any one of <1> to <5>. <7> The composition for forming a colored layer according to any one of <1> to <5>, wherein the additive (D) contains at least one of a singlet oxygen quencher and a peroxide decomposer. <8> The composition for forming a colored layer according to <7>, wherein the singlet oxygen quencher contains one or more selected from the group consisting of dialkyldithiophosphate, dialkyldithiocarbamate, benzenedithiol, transition metal complexes thereof, and a compound represented by the following formula (2). [In the above formula (2), R 1 each independently represents an alkyl group, an alkenyl group, an aryl group, a heterocyclic group, R ９ CO － 、R １０ SO ２ － 、or R １１ NHCO － represents, and R ９ 、R １０ and R １１ each independently represents an alkyl group, an alkenyl group, an aryl group, or a heterocyclic group, and R ２ and R ３ each independently represents a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an alkoxy group, or an alkenyloxy group, R４ ~R ８ Each independently represents a hydrogen atom, an alkyl group, an alkenyl group, or an aryl group. ] <9> A colored layer forming composition according to any one of <1> to <8>, wherein the dye (A) comprises one or more compounds selected from the group consisting of a porphyrin structure, azaporphyrin structure, merocyanine structure, phthalocyanine structure, azo structure, cyanine structure, squarylium structure, coumarin structure, polyene structure, quinone structure, tetradiporphyrin structure, pyromethene structure, and indigo structure, and metal complexes thereof. <10> A colored layer for an optical laminate which is a cured product of the colored layer forming composition according to any one of <1> to <9>. <11> An optical laminate comprising a sheet-like substrate, a functional layer formed on the first surface side of the substrate, and a colored layer which is a cured product of the colored layer forming composition according to <1> to <9> formed on the second surface side of the substrate. <12> The optical laminate according to <11>, wherein the substrate or the functional layer is an ultraviolet absorbing layer having an ultraviolet shielding rate of 85% or more as measured in accordance with JIS L 1925. <13> The optical laminate according to <11> or <12>, wherein an ultraviolet absorbing layer having an ultraviolet shielding rate of 85% or more as measured in accordance with JIS L 1925 is provided between the substrate and the colored layer. <14> The optical laminate according to any one of <11> to <13>, wherein the substrate includes one or more selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, and polyimide. <15> The optical laminate according to any one of <11> to <14>, wherein the functional layer includes one or more selected from the group consisting of a hard coat layer, an anti-reflective layer including a high refractive index layer or a low reflectivity layer, and an anti-glare layer. <16> A display device comprising the optical laminate according to any one of <11> to <15>.

[0010] According to this disclosure, it is possible to provide an optical laminate and a display device using the same, which can be suitably used as components of a flexible display or the like, achieving both flexibility and scratch resistance, which are in a trade-off relationship, and which are less prone to defects even when bent with a small radius of curvature.

[0011] This is a cross-sectional view showing the schematic configuration of a display device according to the first embodiment. This is a schematic diagram showing the problems caused by bending load in conventional products. This is a cross-sectional view showing the schematic configuration of a display device according to the third embodiment. This is a cross-sectional view showing the schematic configuration of a display device according to the fourth embodiment. This is a cross-sectional view showing the schematic configuration of a display device according to the fifth embodiment. This is a conceptual diagram for explaining the method for calculating the reflection characteristics of an optical film. This is a graph showing the spectrum when white is displayed, output through the organic EL light source and color filter in the example. These are graphs of the spectra when red, green, and blue are displayed, output through the organic EL light source and color filter in the example.

[0012] ≪Composition for Forming a Colored Layer≫ The composition for forming a colored layer according to this disclosure is a composition comprising a dye (A), a photopolymerizable compound (B), a photopolymerization initiator (C), an additive (D), and an organic solvent (E). The additive (D) includes a polymer containing a structural unit represented by the following formula (1) as a radical scavenger.

[0013]

[0014] In formula (1), R ａ R represents a hydrogen atom, halogen atom, carboxyl group, sulfo group, cyano group, hydroxyl group, alkyl group having 10 or fewer carbon atoms, alkoxycarbonyl group having 10 or fewer carbon atoms, alkylsulfonylaminocarbonyl group having 10 or fewer carbon atoms, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 or fewer carbon atoms, alkoxy group having 10 or fewer carbon atoms, alkylthio group having 10 or fewer carbon atoms, aryloxy group having 10 or fewer carbon atoms, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 or fewer carbon atoms, acyl group having 10 or fewer carbon atoms, carbamoyl group, sulfamoyl group, aryl group having 10 or fewer carbon atoms, substituted amino group, substituted ureido group, substituted phosphono group, or heterocyclic group. ｂX represents a hydrogen atom or an alkyl group having 30 or fewer carbon atoms, and X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or fewer carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by a combination thereof, and all of these may contain a spirodioxane ring.

[0015] In this specification, "solids" means the total amount of components excluding the solvent. "(meth)acrylate" is a general term for acrylate (ester of acrylic acid) and methacrylate (ester of methacrylic acid). "(meth)acryloyl group" is a general term for acryloyl group and methacryloyl group.

[0016] <Dye (A)> It is preferable to use a dye having the following absorption characteristics. This allows the colored layer to absorb visible light in the wavelength range with relatively low emission intensity among the visible light emitted by the display panel. (1) A first colorant whose maximum absorption wavelength is in the range of 470 nm to 530 nm and whose absorption spectrum full width at half maximum is in the range of 15 nm to 45 nm. (2) A second colorant whose maximum absorption wavelength is in the range of 560 nm to 620 nm and whose absorption spectrum full width at half maximum is in the range of 15 nm to 55 nm. (3) A third colorant whose wavelength with the lowest transmittance in the wavelength range of 400 nm to 780 nm is in the range of 650 nm to 780 nm.

[0017] As the pigment, dyes, pigments, nanometals, etc., can be used, but it is preferable to use one or more compounds selected from the group consisting of compounds having any of the following structures: porphyrin structure, azaporphyrin structure, merocyanine structure, phthalocyanine structure, naphthalocyanine structure, azo structure, cyanine structure, squarylium structure, coumarin structure, polyene structure, quinone structure, tetradiporphyrin structure, pyrometene structure, and indigo structure, and their metal complexes. In particular, it is more preferable to use metal complexes having porphyrin structure, azaporphyrin structure, pyrometene structure, phthalocyanine structure, naphthalocyanine structure, or compounds having a squarylium structure, as these offer superior reliability. These compounds may be included individually or in combination of two or more. In addition, depending on the color adjustment and the desired optical properties, a pigment with a broad full width at half maximum of the absorbance spectrum may be used in combination.

[0018] Examples of metal complexes having an azaporphyrin structure include those represented by the following formula (A1).

[0019]

[0020] In formula (A1), multiple R ａ１ Each is independently a substituted or unsubstituted phenyl group, or a substituted or unsubstituted naphthyl group, R ａ２ This is a linear, branched, or cyclic alkyl group having 1 to 6 carbon atoms.

[0021] Examples of metal complexes having a pyromethene structure include those represented by the following formula (A2).

[0022]

[0023] In formula (A2), multiple R １ ~R ４ Each is independently a linear or branched alkyl group having 1 to 6 carbon atoms, and multiple R ５ Each is independently a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms, and multiple R ８ and R ９ Each of these is independently a linear or branched alkyl group having 1 to 6 carbon atoms. １ ~R４ As for the group, a linear alkyl group having 1 to 4 carbon atoms is preferred, a methyl group, an ethyl group, or a propyl group is more preferred, and a methyl group is even more preferred. ５ Preferably, the group is a hydrogen atom or a linear alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom, a methyl group, an ethyl group, or a propyl group, and even more preferably a hydrogen atom or a methyl group. ８ and R ９ Preferably, the alkyl group is a linear alkyl group having 1 to 4 carbon atoms, more preferably a methyl group, an ethyl group, or a propyl group, and even more preferably a methyl group or an ethyl group.

[0024] Examples of metal complexes having a naphthalocyanine structure include those represented by the following formula (A3).

[0025]

[0026] In formula (A3), multiple R ａ３ is a substituent on the naphthalene ring, each independently being a linear or branched alkyl group having 1 to 6 carbon atoms, and each of the n is independently a number from 0 to 6. Component (A) may be used alone or in combination of two or more types.

[0027] (A) The content of component (A) is preferably 0.01 to 20% by mass, more preferably 0.01 to 15% by mass, and even more preferably 0.01 to 10% by mass, based on the total mass of solids in the colored layer-forming composition. If the content of component (A) is above the lower limit, the reflection suppression effect is better. If the content of component (A) is below the upper limit, the surface properties and flexibility of the coating film are better.

[0028] <Photopolymerizable compound (B)> Photopolymerizable compound (B) comprises one or more monomers (X) (hereinafter also referred to as (X) component) selected from the group consisting of caprolactone-modified (meth)acrylate (hereinafter also referred to as (X1) component), urethane (meth)acrylate (hereinafter also referred to as (X2) component), and ethylene oxide-modified (meth)acrylate (hereinafter also referred to as (X3) component), and a bifunctional (meth)acrylate monomer (Y) (hereinafter also referred to as (Y) component). The number of (meth)acryloyl groups in monomer (X) is preferably 2 to 7, and more preferably 3 to 6.

[0029] (Component (X1)) Component (X1) is a caprolactone-modified (meth)acrylate. In this specification, caprolactone-modified (meth)acrylate means a (meth)acrylate containing a structure derived from caprolactone. The number of (meth)acryloyl groups in monomer (X1) is preferably 2 to 7, and more preferably 3 to 6. When the number of (meth)acryloyl groups is within the above range, both flexibility and scratch resistance can be achieved. Component (X1) is preferably a monomer having a branched structure, L ｘ１ It is preferable that the monomer has a linking group, as will be illustrated later. The following effects can be inferred from the branched structure of component (X1): The structure after photopolymerization becomes bulkier, improving compatibility with other components in the coating film, and as a result, phase separation and poor adhesion are less likely to occur in the coating film, and cracks are less likely to occur during the bending resistance test. Furthermore, from the viewpoint of scratch resistance, the occurrence of scratches in the scratch resistance test is suppressed. In addition, L ｘ１ By using monomers having linking groups, as exemplified later, the following effects can be inferred: The distance between functional groups increases, preventing self-cyclization polymerization and improving the efficiency of polymer network formation. As a result, it is possible to achieve excellent flexural resistance with a smaller amount of additive, and to impart further flexural and scratch resistance to the coating film with other components. Furthermore, because it is a branched structure due to covalent bonds, the resistance of the branched structure is high, improving molecular stability, which is advantageous for thermal stability and fading suppression.

[0030] The (X1) component may include a monomer represented by the following formula (X1).

[0031]

[0032] In formula (X1), R ｘ１ is a hydrogen atom or a methyl group, a is a number from 1 to 6, L ｘ１ is a linking group, R ｘ２ b is a hydrogen atom or a methyl group, and b is a number from 0 to 5.

[0033] a is a number from 1 to 6, preferably 2 to 6, and more preferably 3 to 6. b is a number from 0 to 5, preferably 0 to 4, and more preferably 0 to 3. When a is within the above range, both flexibility and scratch resistance can be achieved. When the number of b is within the above range, both flexibility and scratch resistance can be achieved.

[0034] L ｘ１ Examples of linking groups include divalent to hexavalent organic groups. Those represented by the following formula are preferred. In the following formula, the position of the wavy line indicates the bond position. Among these, those that do not have a hydroxyl group are preferred.

[0035]

[0036]

[0037]

[0038]

[0039]

[0040]

[0041] In formula (X1), Lx1 is preferably expressed by the following formula.

[0042] In formula (X1), L ｘ１ is L ｘ１－１ In this case, it is preferable that a is 3 and b is 0. ｘ１ is L ｘ１－２ In this case, a is preferably 3 to 6 and b is preferably 0 to 3.

[0043] The (X1) component may be represented by the following formula (X1-1).

[0044]

[0045] In formula (X1-1), R ｘ１ a and b are the same as above, L ｘ２ L is a linking group. ｘ２ As for L ｘ１ The same as the above can be cited.

[0046] Examples of component (X1) include ε-caprolactone-modified hydroxyethyl (meth)acrylate, ε-caprolactone-modified dipentaerythritol penta(meth)acrylate, caprolactone-modified dipentaerythritol hexa(meth)acrylate, caprolactone-modified hydroxypivalate neopentyl glycol di(meth)acrylate, and caprolactone-modified tetrahydrofurfuryl (meth)acrylate (an ester of the hydroxyl group of an ester compound of caprolactone and tetrahydrofurfuryl and the carboxyl group of (meth)acrylate). Component (X1) may be used alone or in combination of two or more types.

[0047] (Component (X2)) Component (X2) is a urethane (meth)acrylate. In this specification, urethane (meth)acrylate means a (meth)acrylate containing a urethane bond in its molecule. However, a component corresponding to component (X1) is not considered component (X2), even if it contains a urethane bond. Furthermore, in this specification, prepolymer means a compound having a radical polymerizable group. The number of (meth)acryloyl groups in monomer (X2) is preferably 2 to 7, more preferably 3 to 6, and even more preferably 6. The number of urethane bonds in monomer (X2) is preferably 1 to 6, more preferably 1 to 4, and even more preferably 2. Component (X2) is preferably a monomer having a branched structure, L ｘ１ It is preferable that the monomer has a linking group as exemplified. Examples of component (X2) include monomers represented by the following formula (X2).

[0048]

[0049] In formula (X2), Rｘ１ L is a hydrogen atom or a methyl group. ｘ３ , L ｘ４ and L ｘ５ Each of these is an independent linking group, and multiple R ｘ１ They may be the same or different. L ｘ３ and L ｘ５ L may have two (meth)acryloyl groups. ｘ３ , L ｘ４ and L ｘ５ As for L ｘ１ The same as the above can be cited.

[0050] The (X2) component is preferably one represented by the following formula (X2-1).

[0051]

[0052] In equation (X2-1), multiple R ｘ１ , L ｘ３ and L ｘ５ This is the same as above.

[0053] Examples of component (X2) include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate urethane prepolymer, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, and dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymer. Component (X2) may be used alone or in combination of two or more types.

[0054] (Component (X3)) Component (X3) is an ethylene oxide-modified (meth)acrylate. In this specification, ethylene oxide-modified (meth)acrylate means a (meth)acrylate containing a structure derived from ethylene oxide. Components corresponding to (X1) or (X2) are not considered components (X3), even if they contain a structure derived from ethylene oxide. The number of (meth)acryloyl groups in monomer (X3) is preferably 2 to 7, more preferably 2 to 6, and even more preferably 2. Component (X3) is preferably a monomer having a branched structure, L ｘ１ It is preferable that the monomer has a linking group as exemplified. Examples of component (X3) include monomers having a substructure represented by the following formula (X3).

[0055]

[0056] In formula (X3), R ｘ１ is a hydrogen atom or a methyl group, e is a number from 0 to 6, f is a number from 1 to 6, L ｘ６ is a linking group. e is a number from 1 to 6, preferably 1 to 3, and more preferably 1. f is a number from 1 to 6, preferably 1 to 5, and more preferably 3. L ｘ６ As for L ｘ１ The same as the above can be cited.

[0057] The (X3) component is preferably one represented by the following formula (X3-1).

[0058]

[0059] In formula (X3-1), R ｘ１ e and f are the same as above, L ｘ７ is a linking group, and g is a number from 0 to 6. ｘ７ As for L ｘ１ The same as above can be cited. g is a number from 0 to 6, preferably 0 to 4, and more preferably 0 or 1.

[0060] Examples of component (X3) include bisphenol A ethylene oxide modified di(meth)acrylate, isocyanurate ethylene oxide modified mono(meth)acrylate, isocyanurate ethylene oxide modified di(meth)acrylate, trimethylolpropane ethylene oxide modified tri(meth)acrylate, diglycerin ethylene oxide modified (meth)acrylate, tris-(2-acryloxyethyl) isocyanurate, etc. Component (X3) may be used alone or in combination of two or more types.

[0061] In particular, component (X) preferably contains one or more monomers selected from the group consisting of monomers represented by the following formula (x1), monomers represented by the following formula (x2), and mixtures of monomers represented by the following formula (x3).

[0062] The content of component (X) is preferably 10 to 80% by mass, more preferably 20 to 60% by mass, and even more preferably 30 to 45% by mass, based on the total mass of solids in the colored layer-forming composition. If the content of component (X) is above the lower limit, the flexural resistance is superior. If the content of component (X) is below the upper limit, the hardness and scratch resistance are superior.

[0063] <Component (Y)> Component (Y) is a difunctional (meth)acrylate monomer. In this specification, difunctional means having two (meth)acryloyl groups. Note that monomers corresponding to component (X) are not considered to be component (Y), even if they are difunctional. Component (Y) is preferably a monomer that does not have a branched structure, L ｘ１ It is preferable that the monomer does not have a linking group as exemplified. Examples of component (Y) include monomers represented by the following formula (Y).

[0064]

[0065] In equation (Y), multiple R ｙ１Each of these is independently a hydrogen atom or a methyl group, and h is a number from 1 to 6. h is a number from 1 to 6, preferably 2 to 5, and more preferably 4. Component (Y) may be used alone or in combination of two or more types.

[0066] In particular, the (Y) component preferably contains a monomer represented by the following formula (y1). In formula (y1), s is a number from 1 to 6, preferably 2 to 5, and more preferably 4.

[0067] The content of component (Y) is preferably 10 to 90% by mass, more preferably 20 to 70% by mass, and even more preferably 35 to 50% by mass, based on the total mass of solids in the colored layer-forming composition. If the content of component (Y) is above the lower limit, the color fading suppression effect is superior. If the content of component (Y) is below the upper limit, the hardness and scratch resistance are superior.

[0068] The mass ratio (X / Y ratio) expressed as [content of component (X)] / [content of component (Y)] is preferably 0.1 to 10, more preferably 0.5 to 5, and even more preferably 0.7 to 1.5. If the X / Y ratio is above the lower limit, the fade suppression effect is superior. If the X / Y ratio is below the upper limit, the flexibility is superior.

[0069] The content of component (B) is preferably 30 to 95% by mass, more preferably 50 to 90% by mass, and even more preferably 70 to 90% by mass, based on the total mass of solids in the colored layer-forming composition. If the content of component (B) is above the lower limit, the hardness and scratch resistance are excellent. If the content of component (B) is below the upper limit, the degree of freedom in coating liquid design is excellent.

[0070] <Photopolymerization Initiator (C)> Examples of photopolymerization initiators (C) include: acylphosphine oxide compounds such as bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide and 2,4,6-trimethylbenzoyldiphenylphosphine oxide; α-ketol compounds such as 1-hydroxycyclohexylphenyl ketone; benzoin compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, benzoin benzoic acid, benzoin methyl benzoate, and benzoin dimethyl ketal; acetophenone compounds such as acetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,2-dimethoxy-1,2-diphenylethane-1-one, and 2-hydroxy-1-(4-(4-(2-hydroxy-2-methylpropionyl)benzyl)phenyl)-2-methylpropan-1-one; Examples include sulfide compounds such as benzylphenyl sulfide and tetramethylthiuram monosulfide; azo compounds such as azobisisobutyronitrile; titanocene compounds such as titanocene; thioxanthone compounds such as thioxanthone; peroxide compounds; diketone compounds such as diacetyl; benzyl; dibenzyl; benzophenone; 2,4-diethylthioxanthone; 1,2-diphenylmethane; 2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propanone; quinone compounds such as 1-chloroanthraquinone and 2-chloroanthraquinone; and photosensitizers such as amines. Among these, acylphosphine oxide compounds and α-ketol compounds are preferred.

[0071] As the acylphosphine oxide compound, compounds represented by the following formula (C1-1) or formula (C1-2) are preferred.

[0072]

[0073] In formula (C1-1), multiple R ｃ１ Each of these is an alkyl group having 1 to 5 carbon atoms, and each of the n values ​​is independently a number from 0 to 5.

[0074]

[0075] In formula (C1-2), multiple R ｃ２ Each of these is an alkyl group having 1 to 5 carbon atoms, and each of the n values ​​is independently a number from 0 to 5.

[0076] As component (C1), for example, [phenyl-(2,4,6-trimethylbenzoyl)phosphoryl]-(2,4,6-trimethylphenyl)methanone (Omnirad819) is preferred. Component (C1) may be used alone or in combination of two or more types.

[0077] As the α-ketol compound, the compound represented by the following formula (C2) is preferred.

[0078]

[0079] In formula (C2), multiple R ｃ３ Each of these is an alkyl group having 1 to 5 carbon atoms, and n is a number from 0 to 5, R ｃ４ R is an alkyl group having 1 to 5 carbon atoms. ｃ５ R is an alkyl group having 1 to 5 carbon atoms. ｃ４ and R ｃ５ These elements may be joined together to form a ring.

[0080] As component (C2), for example, 1-hydroxycyclohexylphenyl ketone (Omnirad 184) is preferred. Component (C2) may be used alone or in combination of two or more types.

[0081] The mass ratio (C2 / C1 ratio) expressed as [content of (C2) component] / [content of (C1) component] is preferably 0 to 10, more preferably 0 to 5, and even more preferably 0 to 3. If the C2 / C1 ratio is above the lower limit, the hardness and scratch resistance are superior. If the C2 / C1 ratio is below the upper limit, the adhesion is superior.

[0082] The content of component (C) is preferably 0.1 to 10% by mass, more preferably 0.3 to 5% by mass, and even more preferably 0.5 to 3% by mass, based on the total mass of solids in the colored layer-forming composition. If the content of component (C) is above the lower limit, the hardness and scratch resistance are superior. If the content of component (C) is below the upper limit, the adhesion is superior.

[0083] <Additive (D)> The colored layer-forming composition used to form the colored layer is preferably a polymer having a structural unit represented by the following formula (1) that has the ability to capture radicals (radical scavenging ability).

[0084]

[0085] In the above formula (1), R ａ R represents a hydrogen atom, halogen atom, carboxyl group, sulfo group, cyano group, hydroxyl group, alkyl group having 10 or fewer carbon atoms, alkoxycarbonyl group having 10 or fewer carbon atoms, alkylsulfonylaminocarbonyl group having 10 or fewer carbon atoms, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 or fewer carbon atoms, alkoxy group having 10 or fewer carbon atoms, alkylthio group having 10 or fewer carbon atoms, aryloxy group having 10 or fewer carbon atoms, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 or fewer carbon atoms, acyl group having 10 or fewer carbon atoms, carbamoyl group, sulfamoyl group, aryl group having 10 or fewer carbon atoms, substituted amino group, substituted ureido group, substituted phosphono group, or heterocyclic group. ｂ X represents a hydrogen atom or an alkyl group having 30 or fewer carbon atoms, and X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or fewer carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by a combination thereof, and all of these may contain a spirodioxane ring.

[0086] R ａ Preferably, the alkyl group consists of a hydrogen atom, a hydroxyl group, or an alkyl group having 10 or fewer carbon atoms. The alkyl group preferably has 1 to 6 carbon atoms, and more preferably 1 to 3 carbon atoms. ｂ Preferably, X is a hydrogen atom or an alkyl group having 10 or fewer carbon atoms. The number of carbon atoms in the alkyl group is preferably 1 to 6, and more preferably 1 to 3. Preferably, X is a single bond or an aliphatic alkyl chain having 30 or fewer carbon atoms. The number of carbon atoms in the aliphatic alkyl chain is preferably 10 or less, preferably 1 to 6, and more preferably 2 to 4.

[0087] Furthermore, resins having an amine structure with radical scavenging ability primarily consist of a copolymer of a structural unit represented by formula (1) and a copolymer component having one of the repeating units described below (the component with the highest mass percentage). Being a copolymer allows for control over compatibility with other components.

[0088] Examples of repeating units include (meth)acrylate-based repeating units, olefin-based repeating units, halogen atom-containing repeating units, styrene-based repeating units, vinyl acetate-based repeating units, vinyl alcohol-based repeating units, and the like.

[0089] Examples of (meth)acrylate repeating units include repeating units derived from (meth)acrylate monomers having a linear or branched alkyl group as a side chain, and repeating units derived from (meth)acrylate monomers having a hydroxyl group as a side chain.

[0090] Examples of repeating units derived from (meth)acrylate monomers having the above-mentioned linear or branched alkyl group as a side chain include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, and isopropyl (meth)acrylate. Examples of monomer-derived components include octyl, 2-ethylhexyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, myristyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, and octadecyl (meth)acrylate. These may be used individually or in combination of two or more. Among the above, repeating (meth)acrylate units having a linear or branched alkyl group with 1 to 4 carbon atoms as a side chain are preferably used.

[0091] Examples of repeating units derived from (meth)acrylic monomers having a hydroxyl group in the side chain include monomer-derived components such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, and hydroxyphenyl (meth)acrylate. These may be used individually or in combination of two or more.

[0092] Examples of olefinic repeating units include components derived from olefinic monomers such as ethylene, propylene, isoprene, and butadiene. These may be used individually or in combination of two or more.

[0093] Examples of halogen atom-containing repeating units include monomer-derived components such as vinyl chloride and vinylidene chloride. These may be used individually or in combination of two or more.

[0094] Examples of styrene-based repeating units include styrene, α-methylstyrene, vinyltoluene, and other styrene monomer-derived components. These may be used individually or in combination of two or more. Examples of vinyl acetate-based repeating units include vinyl acetate and vinyl propionate, which are esters of saturated carboxylic acids and vinyl alcohols. These may be used individually or in combination of two or more. Examples of vinyl alcohol-based repeating units include vinyl alcohol, which may have 1,2-glycol bonds in its side chain.

[0095] The copolymer may have any of the following structures: random copolymer, alternating copolymer, block copolymer, or graft copolymer. If the copolymer has a random copolymer structure, the manufacturing process and preparation with other components are easy. For this reason, random copolymers are preferred over other copolymers.

[0096] Radical polymerization can be used as a polymerization method to obtain copolymers. Radical polymerization is preferred because it facilitates industrial production. Radical polymerization may be carried out by solution polymerization, emulsion polymerization, bulk polymerization, and suspension polymerization, etc. Solution polymerization is preferred for radical polymerization. By using solution polymerization, it is easy to control the molecular weight in the copolymer.

[0097] In radical polymerization, the monomers described above may be diluted with a polymerization solvent, and then a polymerization initiator may be added to carry out the polymerization of the monomers.

[0098] The polymerization solvent may be, for example, an ester solvent, an alcohol ether solvent, a ketone solvent, an aromatic solvent, an amide solvent, or an alcohol solvent. Ester solvents may be, for example, methyl acetate, ethyl acetate, n-butyl acetate, isobutyl acetate, t-butyl acetate, methyl lactate, and ethyl lactate. Alcohol ether solvents may be, for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether, 3-methoxy-1-butanol, and 3-methoxy-3-methyl-1-butanol. Ketone solvents may be, for example, acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone. Aromatic solvents may be, for example, benzene, toluene, and xylene. Amide solvents may be, for example, formamide and dimethylformamide. The alcohol-based solvent may be, for example, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, s-butanol, t-butanol, diacetone alcohol, and 2-methyl-2-butanol. Note that one of the polymerization solvents described above may be used alone, or two or more may be used in combination.

[0099] The radical polymerization initiator may be, for example, a peroxide and an azo compound. The peroxide may be, for example, benzoyl peroxide, t-butyl peroxyacetate, t-butyl peroxybenzoate, and di-t-butyl peroxide. The azo compound may be, for example, azobisisobutyronitrile, azobisamidinopropane salt, azobiscyanovaleric acid (salt), and 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)propionamide].

[0100] Polymers containing a structural unit represented by formula (1) that has radical scavenging ability have the function of scavenging radicals when dyes oxidatively degrade and suppressing auto-oxidation, thereby suppressing dye degradation (fading). When the amine structure with radical scavenging ability is a hindered amine structure with a molecular weight of 2000 or more, a large number of molecules remain in the colored layer, so a sufficient fading suppression effect can be obtained, and it is also preferable that the coating film is given flexibility, so when bending is applied by folding, local deformation is suppressed and defects such as cracks are suppressed.

[0101] In addition, monofunctional, bifunctional, or trifunctional (meth)acrylate monomers, urethane (meth)acrylates, etc., can be used as active energy ray curable monomers for forming the colored layer. The polymer may be used alone or in combination of two or more types.

[0102] The polymer content is preferably 1 to 75% by mass, more preferably 5 to 50% by mass, and even more preferably 10 to 25% by mass, based on the total mass of solids in the colored layer-forming composition. If the polymer content is above the lower limit, the color fading suppression effect is superior. If the polymer content is below the upper limit, the hardness, scratch resistance, and adhesion are superior.

[0103] The content of the structural unit represented by the formula (1) is preferably 1 to 50 mol%, more preferably 3 to 30 mol%, and still more preferably 5 to 20 mol% based on the total molar amount of the monomers constituting the polymer. If the content of the structural unit is at least the above lower limit value, the fading suppression effect can be enhanced. If the content of the structural unit is at most the above upper limit value, excellent compatibility can be achieved, and thus suppression of precipitation and improvement of surface properties can be expected.

[0104] The colored layer preferably contains, as an additive, at least one selected from the group consisting of a peroxide decomposer and a singlet oxygen quencher. When the colored layer contains any of these, further deterioration of the dye can be suppressed and the light absorption performance by the colored layer can be maintained.

[0105] (Singlet oxygen quencher) The singlet oxygen quencher has a function of inactivating highly reactive singlet oxygen having a property of easily oxidatively degrading (fading) the dye and suppressing the oxidative degradation (fading) of the dye. Examples of the singlet oxygen quencher include transition metal complexes, dyes, amines, phenols, and sulfides. Particularly preferably used materials include dialkyl phosphates, dialkyldithiocarbamates, benzenedithiol, and transition metal complexes thereof. As the central metal of the transition metal complex, nickel, copper or cobalt is preferably used. Further, the compound represented by the following formula (2) can also be preferably used.

[0106]

[0107] Here, R １ each independently represents an alkyl group, an alkenyl group, an aryl group, a heterocyclic group or a group represented by R ９ CO － R １０ SO ２－ or R １１ NHCO － and R ９ R １０ and R １１ each independently represents an alkyl group, an alkenyl group, an aryl group, or a heterocyclic group. R ２ and R ３Each independently represents a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an alkoxy group, or an alkenyloxy group, R ４ ~R ８ Each of these independently represents a hydrogen atom, an alkyl group, an alkenyl group, or an aryl group. These may be used individually or in combination.

[0108] The singlet oxygen quencher content is preferably 0.1 to 15% by mass, more preferably 0.1 to 10% by mass, and even more preferably 0.1 to 5% by mass, based on the total mass of solids in the colored layer forming composition. If the singlet oxygen quencher content is above the lower limit, the fade-inhibiting effect can be further enhanced. If the singlet oxygen quencher content is below the upper limit, the ease of stretching the colored layer 3 when bent can be improved.

[0109] (Peroxide Decomposing Agents) Peroxide decomposing agents work by decomposing peroxides generated when dyes undergo oxidative degradation, stopping the auto-oxidation cycle and suppressing dye degradation (fading). Phosphorus-based antioxidants and sulfur-based antioxidants can be used as peroxide decomposing agents.

[0110] Examples of phosphorus-based antioxidants include 2,2'-methylenebis(4,6-di-t-butyl-1-phenyloxy)(2-ethylhexyloxy)phosphorus, 3,9-bis(2,6-di-tert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, and 6-[3-(3-t-butyl-4-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-t-butyldibenz[d,f][1,3,2]dioxaphosfepine.

[0111] Examples of sulfur-based antioxidants include 2,2-bis({[3-(dodecylthio)propionyl]oxy}methyl)-1,3-propanediyl-bis[3-(dodecylthio)propionate], 2-mercaptobenzimidazole, dilauryl-3,3'-thiodipropionate, dimyristyl-3,3'-thiodipropionate, distearyl-3,3'-thiodipropionate, pentaerythrityl-tetrakis(3-laurylthiopropionate), and 2-mercaptobenzothiazole. Component (D) may be used alone or in combination of two or more.

[0112] The content of component (D) is preferably 1 to 80% by mass, more preferably 5 to 50% by mass, and even more preferably 10 to 30% by mass, based on the total mass of solids in the colored layer-forming composition. If the content of component (D) is above the lower limit, the color fading suppression effect is excellent. If the content of component (D) is below the upper limit, the hardness and adhesion are even better.

[0113] <Organic Solvents (E)> Examples of organic solvents include ethers, ketones, esters, alcohols, amides, aromatic hydrocarbons, and cellosolves. Examples of ethers include dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydrofuran, anisole, phenethole, propylene glycol monomethyl ether, and propylene glycol monomethyl ether acetate. Examples of ketones include acetone, methyl ethyl ketone, diethyl ketone, dipropyl ketone, diisobutyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone, ethylcyclohexanone, and diacetone alcohol. Examples of esters include ethyl formate, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n-pentyl acetate, γ-butyrolactone, propylene glycol monomethyl ether acetate, and propylene carbonate. Examples of alcohols include propylene glycol monomethyl ether and diacetone alcohol. Examples of amides include N,N-dimethylformamide. Examples of aromatic hydrocarbons include toluene. Examples of cellosolves include methyl cellosolve, cellosolve (ethyl cellosolve), butyl cellosolve, or cellosolve acetate. In particular, as the organic solvent (D), ethers, ketones, esters, alcohols, amides, aromatic hydrocarbons, and combinations of two or more solvents selected from these are preferred, and tetrahydrofuran, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, acetone, methyl ethyl ketone, cyclohexanone, diacetone alcohol, methyl acetate, ethyl acetate, N,N-dimethylformamide, toluene, 1,3-dioxolane, and combinations of two or more solvents selected from these are more preferred. Component (E) may be used alone or in combination of two or more types.

[0114] The content of component (E) is preferably 20 to 80% by mass, more preferably 30 to 70% by mass, and even more preferably 40 to 65% by mass, based on the total mass of the colored layer-forming composition. If the content of component (E) is above the lower limit, the handling properties of the colored layer-forming composition can be further improved. If the content of component (E) is below the upper limit, the time required to form the colored layer can be shortened.

[0115] ≪Colored Layer≫ The colored layer of this disclosure is a cured product of the colored layer forming composition of this disclosure. It can be used as a colored layer in an optical laminate for manufacturing a display device by laminating it with a display panel. The colored layer of this disclosure can be formed by applying the colored layer forming composition to a substrate or the like, and polymerizing and curing it by irradiation with active energy rays such as ultraviolet light or electron beams.

[0116] The thickness of the colored layer is not particularly limited, but is preferably 0.5 to 10 μm. If the thickness of the colored layer is less than 0.5 μm, the pigment concentration contained in the colored layer may not be sufficient, and the light absorption may be insufficient. If the thickness of the colored layer is less than 0.5 μm, increasing the pigment concentration to ensure light absorption is undesirable because it will cause abnormalities in appearance. On the other hand, if the thickness of the colored layer exceeds 10 μm, it is undesirable because it is disadvantageous for thinning the optical laminate.

[0117] ≪Display Device≫ Figure 1 is a cross-sectional view showing the schematic configuration of a display device according to the first embodiment. The upper side in Figure 1 corresponds to the observation side when viewing the display image of the display device. Also, if the display device is a flexible display, the upper surface in Figure 1 is the inner surface when bent (folded).

[0118] The display device 100 shown in Figure 1 comprises a display panel 4 and an optical laminate 10 provided on the display surface side of the display panel 4. The display panel 4 is a self-emissive display panel such as an organic EL panel or a micro LED panel, and metal electrodes and metal wiring are provided within the display surface. The optical laminate 10 comprises a substrate 1, a functional layer 2 laminated on the first surface side (observation side) of the substrate 1, and a coloring layer 3 laminated on the second surface side (display panel 4 side) of the substrate 1. The optical laminate 10 is bonded to the display panel 4 such that the coloring layer 3 faces the display panel 4.

[0119] The display device 200 shown in Figure 3 comprises a display panel 4 and an optical laminate 20 provided on the display surface side of the display panel 4. The optical laminate 20 comprises a substrate 1, a functional layer 2 consisting of a low refractive index layer 2a and a hard coat layer 2b laminated on the first surface side (observation side) of the substrate 1, and a colored layer 3 laminated on the second surface side (display panel 4 side) of the substrate 1. The optical laminate 20 is bonded to the display panel 4 such that the colored layer 3 faces the display panel 4 side.

[0120] The display device 300 shown in Figure 4 comprises a display panel 4 and an optical laminate 20 provided on the display surface side of the display panel 4. The optical laminate 20 comprises a substrate 1, a functional layer 2 consisting of a low refractive index layer 2a and a hard coat layer 2b laminated on the first surface side (observation side) of the substrate 1, and an ultraviolet absorption layer 2c and a colored layer 3 laminated on the second surface side (display panel 4 side) of the substrate 1. The optical laminate 20 is bonded to the display panel 4 such that the colored layer 3 faces the display panel 4 side.

[0121] The display device 400 shown in Figure 5 has the same configuration as in Figure 1, and the functional layer 2 consists of a hard coat layer 2b.

[0122] A portion of the ambient light incident on the display panel 4 is reflected by the metal electrodes and metal wiring of the display panel 4. This reflected light inside the display devices 100 and 200 impairs the contrast and visibility of the display image on the display panel 4. Conventionally, circular polarizers have been used to reduce reflected light on the surface of the display panel 4. The optical laminates 10 to 40 according to this embodiment include a colored layer 3 containing a dye that absorbs light in a specific wavelength range in the visible light region, and thus absorb a portion of the incident ambient light. A portion of the remaining ambient light that is not absorbed by the colored layer 3 is reflected by the display panel 4, but a portion of the reflected light is absorbed by the colored layer 3. As a result, the internal reflectivity of ambient light is significantly reduced. Furthermore, by ensuring that the absorption wavelength range of the dye contained in the colored layer 3 does not overlap with the maximum wavelength of light emitted by the display panel 4, it is possible to suppress the reduction in brightness of the three primary colors emitted from the display panel 4 compared to the case where a circular polarizer is provided, thereby improving the visibility of the display image on the display panel 4.

[0123] Furthermore, the tensile elongation at fracture of the optical laminates 10 to 40 according to this disclosure satisfies the following conditions in both the longitudinal direction (MD) and the width direction (TD). Note that the tensile elongation at fracture is a value measured in accordance with JIS K 7127 (7161). |Lb - La| < |La × 0.1| Where, La: Tensile elongation at fracture with the functional layer formed on the substrate (before the formation of the colored layer) Lb: Tensile elongation at fracture with the functional layer and colored layer formed on the substrate (after the formation of the colored layer).

[0124] When the optical laminate 10 or 20 is applied to a foldable display device, the functional layer 2 becomes the innermost layer of the bent portion and the colored layer 3 becomes the outermost layer of the bent portion when folded. Tensile stress concentrates at the bent portion of the colored layer 3, which may cause cracks in the colored layer 3. In the optical laminates 10 to 40 according to this disclosure, the absolute value of the difference in tensile fracture elongation before and after lamination of the colored layer 3 is less than 10% of the tensile fracture elongation before the formation of the colored layer 3, so the conformability of the colored layer 3 to the substrate 1 is high. Therefore, even when a bending load is applied due to folding, local deformation of the optical laminates 10 to 40 is suppressed, and the occurrence of defects such as cracks is suppressed.

[0125] The details of each layer of the optical laminate 10 to 40 are described below.

[0126] (Substrate) Substrate 1 is a film that serves as the base for optical laminates 10 to 40. Substrate 1 is selected from materials that have excellent visible light transmittance and mechanical strength required for flexible displays. Examples of materials for forming substrate 1 include polyolefins, polyesters, polyacrylates, polyamides, polyimides, polyarylates, polycarbonates, triacetylcellulose, polyvinyl alcohol, polyvinyl chloride, cycloolefin copolymers, norbornene-containing resins, polyethersulfones, and polysulfones. Examples of polyolefins include polyethylene and polypropylene. Examples of polyesters include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. Examples of polyacrylates include polymethyl methacrylate. Examples of polyamides include nylon 6 and nylon 66. Among these, films made of polyethylene terephthalate (PET), films made of triacetylcellulose (TAC), films made of polymethyl methacrylate (PMMA), and films made of polyesters other than PET are preferred. The thickness of the substrate 1 is preferably 10 to 100 μm, and more preferably 20 to 60 μm. If the thickness of the substrate 1 is below the above upper limit, it can be made lighter, which is advantageous for making the display device thinner. If the thickness of the substrate 1 is above the above lower limit, the strength of the optical laminate can be further increased.

[0127] (Functional layer) Functional layer 2 is a layer for adjusting the surface hardness and optical properties of the optical laminates 10 to 40, and may include one or more types of hard coat layers, anti-reflective layers including a high refractive index layer or a low reflectivity layer, and anti-glare layers.

[0128] (Hard Coat Layer) The hard coat layer is a layer for imparting hardness to the optical laminates 10 to 40, and can be formed by applying and curing a hard coat layer forming composition containing an active energy ray curable resin having reactive groups such as radical polymerizable groups that harden with active energy rays, an active energy ray curable monomer, a photopolymerization initiator, and a solvent. The thickness of the hard coat layer is not particularly limited, but is preferably 3 to 10 μm. If the thickness of the hard coat layer is less than 3 μm, the hardness of the hard coat layer may be insufficient. If the thickness of the hard coat layer 2 exceeds 10 μm, it is undesirable because it is disadvantageous for thinning the optical laminates 10 to 40. However, the film thickness of the hard coat layer can be appropriately set according to the surface hardness and overall thickness required for the optical laminate.

[0129] Active energy ray curable monomers are monomers that polymerize and harden upon irradiation with active energy rays such as ultraviolet rays and electron beams. For example, monofunctional, bifunctional, or trifunctional (meth)acrylate monomers can be used. It is preferable to use the above-mentioned components (X) and (Y) as the active energy ray curable monomer (H) for the hard coat layer. This ensures that the types of monomer units are similar to each other when the hard coat layer and the colored layer are laminated adjacent to each other, resulting in excellent adhesion. Examples of active energy ray curable monomers (H) for the hard coat layer include those represented by the following formula (H1).

[0130] The (H1) component is preferably one that has hydroxyl groups. The number of hydroxyl groups is preferably 1 to 5, more preferably 1 to 3, and even more preferably 1 or 2. The (H1) component is preferably one represented by the following formula (H1-1), and more preferably one represented by the following formula (H1-1-1) or the following formula (H-1-2).

[0131]

[0132] In formula (H1), R ｈ１ is a hydrogen atom or a methyl group, i is a number of 1 or more, L ｈ１ L is a linking group having a hydroxyl group. ｈ１ As for L ｘ１Among those listed, those containing a hydroxyl group are particularly noteworthy.

[0133] In formula (H1-1), R ｈ１ And i are the same as above, L ｙ２ is a linking group, and j is a number greater than or equal to 1.

[0134]

[0135] In formula (H1-1-1), R ｈ１ The above is the same, k is a number from 1 to 3, l is a number from 1 to 3, and k+l is a number less than or equal to 4. k+l is a number less than or equal to 4, preferably 2 to 4, and more preferably 4.

[0136]

[0137] In formula (H1-1-2), R ｈ１ The above is the same, m is a number of 1 or 2, n is a number of 1 or 2, m+n is a number of 3 or less, o is a number of 1 or 2, p is a number of 1 or 2, and o+p is a number of 3 or less. m+n is a number of 3 or less, preferably 2 or 3, and more preferably 3. o+p is a number of 3 or less, preferably 2 or 3, and more preferably 3.

[0138] Examples of monofunctional (meth)acrylate compounds include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, glycidyl (meth)acrylate, acryloylmorpholine, N-vinylpyrrolidone, tetrahydrofurfluryl acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isobornyl (meth)acrylate. Phosphate, isodecyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, cetyl (meth)acrylate, stearyl (meth)acrylate, benzyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 3-methoxybutyl (meth)acrylate, ethyl carbitol (meth)acrylate, phosphate (meth)acrylate, ethylene oxide-modified phosphate (meth)acrylate, phenoxy (meth)acrylate, ethylene oxide-modified phenoxy (meth)acrylate, propylene oxide Phenoxy(meth)acrylate modified with ethylene oxide, nonylphenol(meth)acrylate, ethylene oxide-modified nonylphenol(meth)acrylate, propylene oxide-modified nonylphenol(meth)acrylate, methoxydiethylene glycol(meth)acrylate, methoxypolyethylene glycol(meth)acrylate, methoxypropylene glycol(meth)acrylate, 2-(meth)acryloyloxyethyl-2-hydroxypropyl phthalate, 2-hydroxy-3-phenoxypropyl(meth)acrylate, 2-(meth) ) Acryloyloxyethyl hydrogen phthalate, 2-(meth)acryloyloxypropyl hydrogen phthalate, 2-(meth)acryloyloxypropyl hexahydrohydrogen phthalate, 2-(meth)acryloyloxypropyl tetrahydrohydrogen phthalate, dimethylaminoethyl (meth)acrylate, trifluoroethyl (meth)acrylate, tetrafluoropropyl (meth)acrylate, hexafluoropropyl (meth)acrylate, octafluoropropyl (meth)acrylate, 2-adamantane,Examples include adamantane derivative mono(meth)acrylates such as adamantyl acrylate, which has a monovalent mono(meth)acrylate derived from adamantanediol.

[0139] Examples of difunctional (meth)acrylate compounds include di(meth)acrylates such as ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, butanediol di(meth)acrylate, hexanediol di(meth)acrylate, nonanediol di(meth)acrylate, ethoxylated hexanediol di(meth)acrylate, propoxylated hexanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, and hydroxypivalic acid neopentyl glycol di(meth)acrylate.

[0140] Examples of trifunctional (meth)acrylate compounds include trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, tris-2-hydroxyethyl isocyanurate tri(meth)acrylate, glycerin tri(meth)acrylate, and other trifunctional (meth)acrylate compounds such as pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, and ditrimethylolpropane tri(meth)acrylate. Examples include polyfunctional (meth)acrylate compounds with three or more functions, such as pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ditrimethylolpropane penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and ditrimethylolpropane hexa(meth)acrylate, as well as polyfunctional (meth)acrylate compounds in which some of these (meth)acrylates are substituted with alkyl groups or ε-caprolactone.

[0141] Furthermore, urethane (meth)acrylates can also be used as active energy ray curable monomers. Examples of urethane (meth)acrylates include those obtained by reacting a product obtained by reacting a polyester polyol with an isocyanate monomer with a hydroxyl group (meth)acrylate monomer.

[0142] Examples of urethane (meth)acrylates include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate urethane prepolymer, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, and dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymer.

[0143] The above-mentioned active energy ray curable monomer may be used individually or in combination of two or more. Furthermore, the above-mentioned active energy ray curable monomer may be a monomer in the hard coat layer forming composition, or it may be a partially polymerized oligomer (macromonomer).

[0144] Examples of photopolymerization initiators used in hard coat layer forming compositions include 2,2-ethoxyacetophenone, 1-hydroxycyclohexylphenyl ketone, dibenzoyl, benzoin, benzoin methyl ether, benzoin ethyl ether, p-chlorobenzophenone, p-methoxybenzophenone, Michler ketone, acetophenone, and 2-chlorothioxanthone. One of these may be used alone, or two or more may be used in combination.

[0145] Furthermore, examples of solvents used in the hard coat layer forming composition include ethers such as dibutyl ether, dimethoxymethane, dimethoxyethane, diethoxyethane, propylene oxide, 1,4-dioxane, 1,3-dioxolane, 1,3,5-trioxane, tetrahydrofuran, anisole, and phenethole; ketones such as acetone, methyl ethyl ketone, diethyl ketone, dipropyl ketone, diisobutyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, methylcyclohexanone, and methylcyclohexanone; esters such as ethyl formate, propyl formate, n-pentyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl propionate, n-pentyl acetate, and γ-butylolactone; and cellosolves such as methyl cellosolve, cellosolve, butyl cellosolve, and cellosolve acetate. These may be used individually or in combination of two or more types.

[0146] Furthermore, the hard coat layer formation composition may contain metal oxide fine particles for the purpose of adjusting the refractive index or imparting hardness. Examples of metal oxide fine particles include zirconium oxide, titanium oxide, niobium oxide, antimony trioxide, antimony pentoxide, tin oxide, indium oxide, indium tin oxide, antimony tin oxide, and zinc oxide.

[0147] Furthermore, the hard coat layer forming composition may contain any of the following to impart water-repellent and / or oil-repellent properties and enhance stain resistance: silicon oxide, fluorine-containing silane compound, fluoroalkylsilazane, fluoroalkylsilane, fluorine-containing silicon-based compound, or perfluoropolyether group-containing silane coupling agent.

[0148] (Anti-reflective layer) The anti-reflective layer is a layer that suppresses the reflection of external light by canceling out light reflected at different interfaces. The anti-reflective layer can be composed of, for example, a laminate in which a high refractive index layer and a low refractive index layer are stacked in order from the substrate 1 side, or a low refractive index layer stacked on the substrate 1.

[0149] A high refractive index layer can be formed by applying and curing a high refractive index layer-forming composition containing an active energy ray-curable monomer, high refractive index fine particles, a photopolymerization initiator, and a solvent. As high refractive index fine particles, metal oxide fine particles such as zirconium oxide, titanium oxide, niobium oxide, antimony trioxide, antimony pentoxide, tin oxide, indium oxide, indium tin oxide, antimony tin oxide, and zinc oxide can be used. The active energy ray-curable monomer, photopolymerization initiator, and solvent can be the compounds exemplified in the hard coat layer.

[0150] The thickness of the high refractive index layer is not particularly limited, but is preferably 10 to 300 nm. Furthermore, the refractive index of the high refractive index layer is preferably 1.55 to 2.20.

[0151] A low refractive index layer can be formed by applying and curing a low refractive index layer-forming composition containing an active energy ray-curable monomer, a photopolymerization initiator, and a solvent. The low refractive index layer-forming composition may contain LiF, MgF, and 3NaF・AlF for refractive index adjustment. ３ Fine particles such as AlF or silica fine particles may be incorporated. Furthermore, using silica fine particles that have voids inside, such as porous silica fine particles or hollow silica fine particles, is effective in lowering the refractive index of the low refractive index layer. The active energy ray curable monomer, photopolymerization initiator, and solvent can be the compounds exemplified in the hard coat layer.

[0152] The thickness of the low refractive index layer is not particularly limited, but is preferably 40 to 300 nm. Furthermore, the refractive index of the low refractive index layer is preferably 1.25 to 1.40.

[0153] The low refractive index layer may contain any of the following: silicon oxide, fluorine-containing silane compound, fluoroalkylsilazane, fluoroalkylsilane, fluorine-containing silicon-based compound, or perfluoropolyether group-containing silane coupling agent. These materials can enhance stain resistance by imparting water-repellent and / or oil-repellent properties to the low refractive index layer.

[0154] Alternatively, an anti-reflective layer may be constructed by laminating a medium refractive index layer, a high refractive index layer, and a low refractive index layer in that order, starting from the base material 1. The medium refractive index layer only needs to have a refractive index between that of the high refractive index layer and the low refractive index layer. The medium refractive index layer can be formed by applying a medium refractive index layer-forming composition to the base material 1, which is obtained by adding metal oxide fine particles described in the high refractive index layer section to the active energy ray curable monomer, photopolymerization initiator, and solvent described in the hard coat layer section, and then curing it.

[0155] (Anti-glare layer) The anti-glare layer has fine irregularities on its surface, and reduces reflection of external light by scattering external light with these irregularities. The anti-glare layer can be formed by applying and curing an anti-glare layer forming composition, which contains an active energy ray curable monomer, a photopolymerization initiator, and a solvent, to which organic and / or inorganic fine particles are optionally added. The active energy ray curable monomer, photopolymerization initiator, and solvent can be the compounds exemplified in the hard coat layer.

[0156] The thickness of the anti-glare layer is not particularly limited, but is preferably 3 to 10 μm.

[0157] The organic fine particles used in the anti-glare layer-forming composition are primarily materials that create fine irregularities on the surface of the anti-glare layer, thereby imparting the function of diffusing ambient light. As organic fine particles, resin particles made from light-transmitting resin materials such as acrylic resin, polystyrene resin, styrene-(meth)acrylic acid ester copolymer, polyethylene resin, epoxy resin, silicone resin, polyvinylidene fluoride, and polyfluoroethylene resins can be used. To adjust the refractive index and dispersibility of the resin particles, two or more types of resin particles with different materials (refractive index) may be mixed and used.

[0158] The inorganic fine particles used in the anti-glare layer forming composition are primarily materials for adjusting the sedimentation and aggregation of organic fine particles in the anti-glare layer. As inorganic fine particles, silica fine particles, metal oxide fine particles, and various mineral fine particles can be used. As silica fine particles, for example, colloidal silica or silica fine particles surface-modified with reactive functional groups such as (meth)acryloyl groups can be used. As metal oxide fine particles, for example, alumina, zinc oxide, tin oxide, antimony oxide, indium oxide, titania, and zirconia can be used. As mineral fine particles, for example, mica, synthetic mica, vermiculite, montmorillonite, iron montmorillonite, bentonite, bydelite, saponite, hectorite, stevensite, nontronite, magadiite, islarite, kanemite, layered titanate, smectite, and synthetic smectite can be used. Mineral fine particles may be natural products or synthetic products (including substituted and derivative products), or mixtures of both may be used. Among mineral microparticles, layered organic clay is more preferred. Layered organic clay refers to a material in which organic onium ions are introduced between layers of swellable clay. The organic onium ions are not limited as long as they can be organicated by utilizing the cation exchange properties of the swellable clay. When layered organic clay minerals are used as mineral microparticles, the synthetic smectite described above can be suitably used. Synthetic smectite has the function of increasing the viscosity of the coating liquid for forming the anti-glare layer, suppressing the settling of resin particles and inorganic microparticles, and adjusting the uneven surface shape of the optical functional layer.

[0159] The anti-glare layer-forming composition may contain any of the following: silicon oxide, fluorine-containing silane compound, fluoroalkylsilazane, fluoroalkylsilane, fluorine-containing silicon-based compound, or perfluoropolyether group-containing silane coupling agent. These materials can enhance stain resistance by imparting water-repellent and / or oil-repellent properties to the anti-glare layer.

[0160] (Colored layer) The colored layer is formed from a colored layer forming composition. The colored layer 3 is a layer for reducing light emitted from the display panel 4 and transmitted through the optical laminates 10 to 40, and reflected light that is reflected by the metal electrode members and reflective members of the display panel 10 and re-emitted, and contains a dye for selectively absorbing a specific wavelength band of visible light. The colored layer can be formed by applying and curing the colored layer forming composition of this disclosure. The thickness of the colored layer 3 is as described above.

[0161] (Ultraviolet Absorption Layer) The ultraviolet absorption layer 2c shown in Figure 4 absorbs ultraviolet rays that degrade the pigments contained in the colored layer 3. The ultraviolet absorption layer 2c can be formed by applying an ultraviolet absorption layer forming composition containing an active energy ray curable monomer, an ultraviolet absorber (UVA), a photopolymerization initiator, and a solvent to the substrate 1 and curing it.

[0162] Furthermore, in the optical laminate 10 shown in Figure 1, either the substrate 1 or the functional layer 2 may be made to contain an ultraviolet absorber, thereby creating an ultraviolet absorbing layer.

[0163] In both cases where either the base material 1 or the functional layer 2 is an ultraviolet absorbing layer, or where a separate ultraviolet absorbing layer 2c is provided, it is preferable that the ultraviolet shielding rate of the ultraviolet absorbing layer be 85% or higher. Here, the ultraviolet shielding rate is a value measured in accordance with JIS L 1925 and is calculated by the following formula: Ultraviolet shielding rate (%) = 100 - Average transmittance of ultraviolet light with wavelengths of 290 to 400 nm (%)

[0164] As UV absorbers, benzophenone-based, benzotriazole-based, triazine-based, anilide-based, and cyanoacrylate-based compounds can be used. Since UV absorbers are added to suppress the degradation of the pigments contained in the colored layer 3, those that absorb light in the wavelength range within the ultraviolet region that contributes to the degradation of the pigments contained in the colored layer 3 should be used.

[0165] Furthermore, leveling agents, defoaming agents, antioxidants, light stabilizers, photosensitizers, conductive materials, and the like may be added as other additives to the composition for forming each layer.

[0166] <Effects and Effects> The effects and effects of this disclosure are presumed to be as follows. The colored layer-forming composition of this disclosure contains specific monomers (X) and (Y). It is thought that the monomer (X) after curing enhances flexibility by forming a chain-like structure, and the monomer (Y) enhances scratch resistance by forming a monomer crosslinked structure. While the monomer (X) after curing enhances flexibility by forming a chain-like structure, its density tends to be low because the molecules become linear. Low density tends to reduce the hardness of the resulting cured product (colored layer). A decrease in hardness reduces scratch resistance, resulting in a brittle and easily broken colored layer. In this disclosure, by using monomer (X) which enhances flexibility and a bifunctional monomer (Y) which can form a high-density crosslinked structure in combination, it is possible to improve hardness while enhancing flexibility, thus achieving a balance between flexibility and scratch resistance, which are in a trade-off relationship. Furthermore, the colored layer of this disclosure is formed by applying the colored layer-forming composition of this disclosure to the surface of a substrate or the like and curing it. This allows the monomer components to penetrate the fine irregularities on the surface of the substrate, and after curing, they form a shape that conforms to the irregularities, thereby further enhancing adhesion to the substrate. Furthermore, the optical laminate of this disclosure comprises the colored layer of this disclosure. This makes it possible to achieve both flexibility and scratch resistance, which are in a trade-off relationship, even in laminates consisting of three or more layers. Furthermore, the display device of this disclosure comprises the optical laminate of this disclosure. This makes it possible to achieve both flexibility and scratch resistance even after it has been attached to the display panel.

[0167] As described above, the optical laminates 10 to 40 according to this disclosure have a colored layer 3 that stretches easily in accordance with the bending of the substrate 1, and have high conformability to the bending of the substrate 1. Therefore, even when a bending load is applied due to folding, local deformation of the optical laminates 10 to 40 is suppressed, and the occurrence of defects such as cracks is suppressed. Accordingly, the optical laminates 10 to 40 according to this disclosure can be suitably used as components of flexible displays and the like, achieving both flexibility and scratch resistance, which are in a trade-off relationship, and are less prone to defects even when bent with a small radius of curvature.

[0168] The present disclosure will be described in more detail below using examples. The technical scope of this disclosure is not limited in any way on the basis of the specific contents of these examples alone.

[0169] <<Fabrication of Optical Films>> In the following examples, optical films A to M with the layer configurations shown in Tables 1 and 2 were fabricated. In the tables, "-" indicates that the layer is not present. The method for forming each layer is described below. Optical films A to J and L in Examples 1 to 10 and 12 correspond to Configuration Example 1, optical film M in Example 13 corresponds to Configuration Example 2, and optical film K in Example 11 corresponds to Configuration Example 3. The optical films in Configuration Examples 1 to 3 correspond to optical films 20 to 40 shown in Figures 3 to 5, respectively.

[0170] Configuration Example 1: The transparent substrate has UV absorption capabilities. Configuration Example 2: Configuration Example 1 with the low refractive index layer removed. Configuration Example 3: The transparent substrate does not have UV absorption capabilities, and a UV absorption layer is placed between the colored layer and the transparent substrate.

[0171]

[0172]

[0173] For the compositions of Examples 1 to 13, coating solutions were prepared using the formulations shown in Tables 3 and 4, and the optical films with the compositions shown in Tables 1 and 2 were evaluated.

[0174] <Transparent Substrate> The following transparent substrates were used: • PMMA: Polymethyl methacrylate film (manufactured by Sumitomo Chemical Co., Ltd., W002N80, substrate thickness 80 μm, UV shielding rate 13.9%) • Polyimide: Polyimide film (manufactured by I.S.T. Co., Ltd., TORMED TYPE S, substrate thickness 50 μm, UV shielding rate 99.0%)

[0175]

[0176]

[0177] The hard coat layer was prepared using the formulation shown in Table 5.

[0178]

[0179] ≪Fabrication of Optical Films≫ <Hard Coat Layer> [Materials Used for Hard Coat Layer Formation Composition] The following materials were used for the hard coat layer formation: ・Photopolymerizable compounds UA-306H: Pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer (manufactured by Kyoeisha Chemical Co., Ltd., UA-306H). DPHA: Dipentaerythritol hexaacrylate. PETA: Pentaerythritol triacrylate. A-9300: Trith-(2-acryloxyethyl) isocyanurate (manufactured by Shin-Nakamura Chemical Co., Ltd., A-9300). A-200: Polyethylene glycol #200 diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., A-200).

[0180]

[0181]

[0182]

[0183]

[0184]

[0185] • Additive resin 1: R of formula (1) ａ ga CH ３ , R ｂ ga CH ３ A resin having a structural unit in which X is a single bond (molecular weight 120,000). (Example of production of resin 1) 2.4 g of 1,2,2,6,6-pentamethyl-4-piperidyl methacrylic acid (manufactured by Showa Denko Materials Co., Ltd., FA-711MM), 5.6 g of methyl methacrylate (manufactured by Kanto Chemical Co., Ltd.), 31 g of cyclohexanone (manufactured by Kanto Chemical Co., Ltd.), and 0.11 g of 2,2'-azobis(isobutyronitrile) (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) were placed in a reaction vessel and heated and stirred at 70°C for 8 hours under a nitrogen gas atmosphere. Then, the mixture was heated and stirred at 100°C for 1 hour to obtain a polymer solution. This polymer solution was poured into 400 mL of methanol (manufactured by Kanto Chemical Co., Ltd.), and the precipitate that formed was filtered and dried to obtain resin 1 copolymerized with 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate:methyl methacrylate = 15:85 [mol%].

[0186] • Photopolymerization initiators: Omnirad 819: Acylphosphine oxide-based photopolymerization initiator (manufactured by IGM Resins B.V.). Omnirad 184: Hydroxyalkylphenone-based photopolymerization initiator (manufactured by IGM Resins B.V.). • Ultraviolet (UV) absorbers: Tinuvin 477: Hydroxyphenyltriazine-based UV absorber, Tinuvin® 477 (manufactured by BASF Japan Ltd.). Tinuvin 479: Hydroxyphenyltriazine-based UV absorber, Tinuvin® 479 (manufactured by BASF Japan Ltd.). Tinuvin 970: Hydroxyphenyltriazine-based UV absorber, Tinuvin® 970 (manufactured by BASF Japan Ltd.). • Additives: Anti-glare particles. (Resin particles) Styrene-methyl methacrylate copolymer particles (refractive index 1.515, average particle size 2.0 μm). (Inorganic fine particles) Inorganic particle 1: Synthetic sucmetite. Inorganic particle 2: Alumina nanoparticles (average particle size 40 nm). Solvents. MEK: Methyl ethyl ketone. Methyl acetate: Methyl acetate. Toluene: Toluene. IPA: Isopropyl alcohol.

[0187] [Formation of Hard Coat Layer] The hard coat layer-forming compositions shown in Table 5 were applied to the transparent substrate or oxygen barrier layer and the first functional layer, and dried in an oven at 80°C for 60 seconds. After that, an ultraviolet irradiation device was used to irradiate the area at a dose of 150 mJ / cm². ２ The coating film was cured by ultraviolet irradiation using a light source H-bulb (manufactured by Fusion UV Systems Japan Co., Ltd.), forming a hard coat layer with a cured film thickness of 5.0 μm. The amount of additive is given as a mass ratio (mass%). In the table, "-" indicates that the component is not contained.

[0188] <Low Refractive Index Layer> [Composition for Forming a Low Refractive Index Layer] The following was used as the composition for forming the low refractive index layer: ・Refractive index adjusting agent: 8.5 parts by mass of porous silica fine particles (average particle size 75 nm, solid content 20%) methyl isobutyl ketone dispersion. ・Antifouling agent: 5.6 parts by mass of Optool (registered trademark) AR-110 (manufactured by Daikin Industries, Ltd., solid content 15%, solvent: methyl isobutyl ketone). ・Active energy ray curable monomer: pentaerythritol triacrylate (PETA). ・Photopolymerization initiator: 0.07 parts by mass of Omnirad TPO (manufactured by IGMResins B.V.). ・Leveling agent: 1.7 parts by mass of RS-77 (manufactured by DIC Corporation). ・Solvent: 83.73 parts by mass of methyl isobutyl ketone. [Formation of Low Refractive Index Layer] The above low refractive index layer forming composition was applied to the hard coat layer and dried in an oven at 80°C for 60 seconds. Then, an ultraviolet irradiation device was used to irradiate it at a dose of 200 mJ / cm². ２ The coating was cured by irradiating it with ultraviolet light using a light source H-bulb (manufactured by Fusion UV Systems Japan Co., Ltd.), forming a low refractive index layer with a curing thickness of 100 nm.

[0189] <Colored Layer> [Materials Used in Composition for Forming the Colored Layer] The following materials were used in the composition for forming the colored layer. Note that the absorption maximum wavelength, full width at half maximum, and minimum transmittance wavelength in the specified wavelength range of the colorant are characteristic values ​​of the cured coating film. ・Colorant (First colorant) Dye-1: Pyrometen cobalt complex dye (absorption maximum wavelength 496 nm, full width at half maximum 23 nm). <Example of Dye-1 Production> 5-formyl-2,4-dimethyl-1H-pyrrole-3-carboxylate ethyl (Ethyl 2,4-dimethyl-5-formyl-1H-pyrrole-3-carboxylate, 2.5 g) was sealed in a reaction vessel and dissolved in methanol (50 mL). Then, 47% hydrobromic acid (45 g) was added and refluxed for 1 hour. By filtering off the precipitated solid, 3,3',5,5'-tetramethyl-4,4'-diethoxycarbonyl-2,2'-dipyrometene hydrobromide (2.6 g) was obtained. 3,3',5,5'-tetramethyl-4,4'-diethoxycarbonyl-2,2'-dipyrometene hydrobromide (0.6 g) was sealed in a reaction vessel, methanol (5 mL), triethylamine (0.17 g), and cobalt acetate tetrahydrate (0.18 g) were added, and reflux was carried out for 2 hours. By filtering off the precipitated solid, Dye-1 (0.42 g) was obtained. (Second colorant) Dye-2: Tetraazaporforin copper complex dye (manufactured by Yamamoto Kasei Co., Ltd., PD-311S, absorption maximum wavelength 586 nm, full width at half maximum 22 nm). Dye-3: Tetraazaporforin copper complex dye (manufactured by Yamada Chemical Industries, Ltd., FDG-007, absorption maximum wavelength 595 nm, full width at half maximum 22 nm). (Third colorant) Dye-4: Phthalocyanine copper complex dye (manufactured by Yamada Chemical Industries, Ltd., FDN-002, minimum transmittance wavelength 780 nm in the 400-780 nm range). Pigment-1: Phthalocyanine copper complex pigment (manufactured by Toyo Visual Solutions Co., Ltd., CFPM-SP20-7712BLU)

[0190] • Photopolymerizable compound: (X) component UA-306H: Pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer (manufactured by Kyoeisha Chemical Co., Ltd., UA-306H). A-9300: Trith-(2-acryloxyethyl) isocyanurate (manufactured by Shin Nakamura Chemical Co., Ltd., A-9300). M-313: Isocyanurate ethylene oxide modified di and triacrylate (manufactured by Toagosei Co., Ltd., M-313).

[0191]

[0192] ...(Y) Component A-200: Polyethylene glycol #200 diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., A-200).

[0193] • Photopolymerization initiators: Omnirad 819: Acylphosphine oxide-based photopolymerization initiator (manufactured by IGM Resins B.V.). Omnirad 184: Hydroxyalkylphenone-based photopolymerization initiator (manufactured by IGM Resins B.V.). • Solvents: MEK: Methyl ethyl ketone. IPA: Isopropyl alcohol. • Additive resin 1: R of formula (1). ａ ga CH ３ , R ｂ ga CH ３A resin having an amine structure in which X is a single bond (molecular weight 120,000). (Example of production of resin 1) 2.4 g of 1,2,2,6,6-pentamethyl-4-piperidyl methacrylic acid (manufactured by Showa Denko Materials Co., Ltd., FA-711MM), 5.6 g of methyl methacrylate (manufactured by Kanto Chemical Co., Ltd.), 31 g of cyclohexanone (manufactured by Kanto Chemical Co., Ltd.), and 0.11 g of 2,2'-azobis(isobutyronitrile) (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) were placed in a reaction vessel and heated and stirred at 70°C for 8 hours under a nitrogen gas atmosphere. Then, the mixture was heated and stirred at 100°C for 1 hour to obtain a polymer solution. This polymer solution was poured into 400 mL of methanol (manufactured by Kanto Chemical Co., Ltd.), and the precipitate formed was filtered and dried to obtain resin 1 copolymerized with 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate:methyl methacrylate = 15:85 [mol%]. Additives: D1781: singlet oxygen quencher, bis(dibutyldithiocarbamate)nickel(II), product code D1781 (manufactured by Tokyo Chemical Industry Co., Ltd.). [Formation of colored layer] The colored layer-forming compositions shown in Tables 1 and 2 were applied to the transparent substrate and dried in an oven at 80°C for 60 seconds. After that, an ultraviolet irradiation device was used to irradiate at a dose of 150 mJ / cm². ２ The coating film was cured by ultraviolet irradiation using a light source H-bulb (manufactured by Fusion UV Systems Japan Co., Ltd.), and a colored layer was formed so that the film thickness after curing was 5.0 μm. In Example 11, the hard coat layer 3 forming composition shown in Table 5 was applied to the transparent substrate, and cured in the same manner as above to form a hard coat layer 3 (ultraviolet absorption layer). On top of this, the colored layer forming composition shown in Table 4 was applied, and cured in the same manner as above to form a colored layer.

[0194] ≪Results≫ [Optical Characteristics Evaluation Results and Display Characteristics]

[0195]

[0196]

[0197] Based on the above, this disclosure provides an optical laminate and a display device using the same that achieve both flexibility and scratch resistance, which are in a trade-off relationship, and are less prone to defects even when bent with a small radius of curvature. Examples 5 and 9 confirmed that light resistance and heat resistance were improved by using a singlet oxygen quencher. Examples 10 and 11 confirmed that light resistance, heat resistance, and scratch resistance were achieved by having the ultraviolet absorption layer above the colored layer. Examples 1 to 3 showed significantly lower reflectivity. Furthermore, while it is said that transmittance is halved in circular polarizers, the brightness efficiency was excellent, as shown in the evaluation value of white display transmittance, and color reproducibility was also improved. In Examples 1 to 3, the greater the absorption region, the better the reflectivity was.

[0198] ≪Evaluation Method≫ [Optical Film Characteristic Evaluation Results: UV Shielding Rate, Flexural Resistance Test, Scratch Resistance Test, Reliability Test, Weather Resistance Test, Heat Resistance Test, White Display Transmission Characteristic Test, Display Device Reflectivity Characteristic Test, Color Reproducibility Test] (UV Shielding Rate) The first functional layer upper layer configuration of Examples 1 to 13 was formed on a glass substrate, peeled off using cellophane tape conforming to the JIS-K5600 adhesion test, and the transmittance was measured using an automatic spectrophotometer (Hitachi, Ltd., U-4150) with the adhesive tape as a reference. Using these transmittances, the average transmittance [%] in the ultraviolet region (290 nm to 400 nm) was calculated, and the UV shielding rate [%] was calculated as the value obtained by subtracting the average transmittance [%] in the ultraviolet region (290 nm to 400 nm) from 100%. A UV shielding rate of 90% or more is preferable, 95% or more is more preferable, and 100% is also acceptable.

[0199] (Flexural Resistance Test) From the optical laminate of each embodiment, a test specimen measuring 80 mm in the longitudinal direction (MD) x 30 mm in the width direction (TD) was cut out. The test specimen was set in a bending test machine (DLDMLH-FS, manufactured by Yuasa System Equipment Co., Ltd.) so that the colored layer was bent outwards, and the test specimen was bent 200,000 times along the direction perpendicular to the longitudinal direction with a bending radius (R) of 1 mm, after which the flexural resistance (MD) was evaluated. For flexural resistance (TD), a test specimen measuring 30 mm in the longitudinal direction (MD) x 80 mm in the width direction (TD) was cut out, and the test specimen was bent 200,000 times along the direction perpendicular to the width direction with a bending radius (R) of 1 mm, after which the flexural resistance (TD) was evaluated. The tests were conducted under conditions of 25°C, 50% RH, and a bending speed of 60 cycles / min. Flexural resistance was evaluated according to the following criteria depending on the presence or absence of defects. ○: No defects occur even with a bending radius (R) of 1 mm. ×: Defects occur with a bending radius (R) of 1 mm.

[0200] (Scratch Resistance Test) A piece of steel wool measuring 8 cm in length and 1 cm in width (Bonstar No. 000, manufactured by Nippon Steel Wool Co., Ltd.) was used as the scratching surface and fixed to the tip of the arm of a scratch resistance tester (AB-301, manufactured by Tester Industry Co., Ltd.). The scratch resistance tester has an arm, a main body that receives the base end of the arm and drives the base end to swing at least the tip end, and a load-applying part for applying a load to the tip of the arm. The load-applying part in this case is a weight-holding part provided on the upper side of the tip of the arm and a 250 g (gram) weight. By placing the weight on the weight-holding part, a load of 250 g is applied to the scratching surface fixed to the tip of the arm. The scratching surface was then moved back and forth 10 times on the surface of the colored layer of each film at a speed of one back and forth per second (13 cm one way), rubbing it against the surface of the colored layer of each film to create scratches on the surface. If the number of scratches on the film surface after the abrasion test was 10 or less, it was considered good (indicated as "○" in Tables 6 and 7), and if there were 10 or more scratches, it was considered poor (indicated as "×" in Tables 6 and 7).

[0201] (Lightfastness Test) As a reliability test of the obtained optical film, a xenon weather meter tester (Suga Test Instruments Co., Ltd., X75) was used, with a xenon lamp illuminance of 60 W / cm². ２The test was conducted for 120 hours at a wavelength of 45°C and 50% RH in the testing chamber (300 nm to 400 nm). Transmittance measurements were taken before and after the test using an automatic spectrophotometer (Hitachi, Ltd., U-4100), and the difference in UV shielding rate before and after the test, ΔT(290-400 nm), was calculated. A difference in UV shielding rate close to zero is preferable, with |ΔT(290-400 nm)| ≤ 10 being preferable, and |ΔT(290-400 nm)| ≤ 5 being even preferable. In the case of an optical film containing a colorant in the first functional layer, the difference in transmittance before and after the test, ΔTλ1, at wavelength λ1 showing the minimum transmittance before the test in the wavelength range of 470 nm to 530 nm, and the difference in transmittance before and after the test, ΔTλ2, at wavelength λ2 showing the minimum transmittance before the test in the wavelength range of 560 nm to 620 nm, were also calculated. A transmittance difference close to zero is preferable, with |ΔTλN| ≤ 20 (N = 1, 2) being preferable, and |ΔTλN| ≤ 10 (N = 1, 2) being even preferable.

[0202] (Heat Resistance) A heat resistance test was conducted on the optical film as a reliability test. The heat resistance test was performed using an environmental testing machine (SU-221, manufactured by ESPEC Corporation) at 90°C for 500 hours. Transmittance measurements were taken before and after the test using an automatic spectrophotometer (U-4100, manufactured by Hitachi, Ltd.), and the difference in transmittance before and after the test, ΔTλmin, was calculated at the wavelength λmin that showed the minimum transmittance before the test in the wavelength range of 330 nm to 780 nm. A transmittance difference close to zero is good, and it is preferable that |ΔTλmin| ≤ 15, and even more preferable that |ΔTλmin| ≤ 10.

[0203] [Display Device Characteristics] When the first functional layer does not contain colorants, it is preferable for the display device characteristics to change as little as possible. On the other hand, when the first functional layer contains colorants, it is preferable to take more favorable values ​​in the characteristic values ​​shown below.

[0204] (White Display Transmission Characteristics) The transmittance of the obtained optical film was measured using an automatic spectrophotometer (Hitachi, Ltd., U-4100). Using this transmittance, the efficiency of the light transmitted through the optical film during white display was calculated and evaluated as the white display transmission characteristics. The aforementioned efficiency was calculated as the ratio of the light intensity values ​​at each wavelength of light transmitted through the optical film to the light intensity at each wavelength during white display, when the light intensity at each wavelength during white display, emitted from a white organic EL light source and output through a color filter, is set to 100. A higher light intensity ratio indicates higher luminance efficiency of the light source.

[0205] (Display Device Reflectivity) The transmittance T(λ) and surface reflectance R2(λ) of the obtained optical film were measured using an automatic spectrophotometer (Hitachi, Ltd., U-4100). For the measurement of surface reflectance R2(λ), a matte black paint was applied to the surface of the transparent substrate triacetylcellulose film that did not have a colored layer or functional layer to prevent reflection, and spectral reflectance measurement was performed at an incident angle of 5° to obtain the surface reflectance R2(λ). Electrode reflectance R Ｅ Assuming (λ) is 100% for all wavelengths from 380 nm to 780 nm, and with the light intensity of reflected light from a D65 light source without an optical film placed set to 100, the relative reflection values ​​were calculated based on the following equations (1) to (4), without considering interfacial reflection and surface reflection in each layer, and evaluated as the display device reflection characteristics. A lower relative reflection value indicates lower reflected light intensity and higher display quality.

[0206]

[0207]

[0208]

[0209]

[0210] (Color Reproducibility) The transmittance of the obtained optical film was measured using an automatic spectrophotometer (Hitachi, Ltd., U-4100). The NTSC ratio was calculated from this transmittance and the CIE1931 chromaticity values ​​obtained using the red, green, and blue display spectra output through the organic EL light source and color filter, and evaluated as color reproducibility. A higher NTSC ratio indicates broader color reproducibility, which is preferable.

[0211] (Schematic diagram of electrode reflection) Figure 6 is an explanatory diagram of the method for calculating the reflection characteristics of the optical film of this disclosure. As shown in Figure 6, P Ｄ６５ (λ) represents the spectrum of the D65 light source, R Ｅ (λ) represents the electrode reflectance, R1(λ) represents the internal reflectance component, R2(λ) represents the surface reflectance, and R(λ) represents the sum of R1(λ) and R2(λ), indicating the reflectance. Also, reference numeral 20 denotes the optical film, reference numeral 1 denotes the transparent substrate, reference numeral 20a denotes the surface of the optical film, reference numeral 20b denotes the back surface of the optical film, reference numeral 3 denotes the colored layer, reference numeral 2b denotes the hard coat layer, and reference numeral 2a denotes the low refractive index layer. Figure 6 shows the layer configuration of the optical film of Example 1, but the same applies to other layer configurations.

[0212] (Spectrum when displaying white light from an organic EL light source) Figure 7 is a graph showing the spectrum when displaying white light output through the organic EL light source and color filter in the example.

[0213] (Spectra when each color is displayed by the organic EL light source) Figure 8 is a graph of the spectra when red, green, and blue are displayed, output through the organic EL light source and color filter in the embodiment.

[0214] Although one embodiment and example of the present disclosure have been described in detail above, the present disclosure is not limited to any particular embodiment and includes modifications, combinations, etc., of the configuration that do not depart from the gist of the present disclosure.

[0215] According to this disclosure, it is possible to provide an optical laminate and a display device using the same, which can be suitably used as components of a flexible display or the like, achieving both flexibility and scratch resistance, which are in a trade-off relationship, and which are less prone to defects even when bent with a small radius of curvature.

[0216] This disclosure can be used as a protective film for display devices, and is particularly suitable as a protective film for foldable flexible displays.

[0217] 1. Substrate 2. Functional layer 2a. Low refractive index layer 2b. Hard coat layer 2c. UV absorption layer 3. Colored layer 4. Display panel 10, 20, 30, 40 Optical laminate 100, 200, 300, 400 Display device

Claims

1. A colored layer-forming composition comprising a dye (A), a photopolymerizable compound (B), a photopolymerization initiator (C), an additive (D), and an organic solvent (E), wherein the photopolymerizable compound (B) comprises one or more monomers (X) selected from the group consisting of caprolactone-modified (meth)acrylate, urethane (meth)acrylate, and ethylene oxide-modified (meth)acrylate, and a bifunctional (meth)acrylate monomer (Y), and the additive (D) comprises a polymer containing a structural unit represented by the following formula (1) as a radical scavenger. In formula (1), R ａ R represents a hydrogen atom, halogen atom, carboxyl group, sulfo group, cyano group, hydroxyl group, alkyl group having 10 or fewer carbon atoms, alkoxycarbonyl group having 10 or fewer carbon atoms, alkylsulfonylaminocarbonyl group having 10 or fewer carbon atoms, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 or fewer carbon atoms, alkoxy group having 10 or fewer carbon atoms, alkylthio group having 10 or fewer carbon atoms, aryloxy group having 10 or fewer carbon atoms, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 or fewer carbon atoms, acyl group having 10 or fewer carbon atoms, carbamoyl group, sulfamoyl group, aryl group having 10 or fewer carbon atoms, substituted amino group, substituted ureido group, substituted phosphono group, or heterocyclic group. ｂ X represents a hydrogen atom or an alkyl group having 30 or fewer carbon atoms, and X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or fewer carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by a combination thereof, and all of these may contain a spirodioxane ring.

2. The colored layer forming composition according to claim 1, wherein the content of monomer (X) is 30 to 45% by mass with respect to the total mass of solids of the composition, the content of monomer (Y) is 35 to 50% by mass with respect to the total mass of solids of the composition, and the content of additive (D) is 10 to 25% by mass with respect to the total mass of solids of the composition.

3. The colored layer forming composition according to claim 1, wherein the monomer (X) comprises one or more monomers selected from the group consisting of a monomer represented by the following formula (x1), a monomer represented by the following formula (x2), and a mixture of monomers represented by the following formula (x3).

4. The colored layer forming composition according to claim 1, wherein the monomer (Y) comprises a monomer represented by the following formula (y1). In equation (y1), s is a number between 1 and 6.

5. A colored layer forming composition comprising a dye (A), a photopolymerizable compound (B), a photopolymerization initiator (C), an additive (D), and an organic solvent (E), wherein the photopolymerizable compound (B) comprises one or more monomers (X) selected from the group consisting of caprolactone-modified (meth)acrylate, urethane (meth)acrylate, and ethylene oxide-modified (meth)acrylate, and a bifunctional (meth)acrylate monomer (Y), the additive (D) comprises a polymer containing a structural unit represented by the following formula (1) as a radical scavenger, the content of monomer (X) is 30 to 45% by mass with respect to the total mass of solids of the composition, the content of monomer (Y) is 35 to 50% by mass with respect to the total mass of solids of the composition, and the content of additive (D) is 10 to 25% by mass with respect to the total mass of solids of the composition. A colored layer forming composition wherein the monomer (X) comprises one or more monomers selected from the group consisting of a monomer represented by the following formula (x1), a monomer represented by the following formula (x2), and a mixture of monomers represented by the following formula (x3), and the monomer (Y) comprises a monomer represented by the following formula (y1). In formula (1), R ａ R represents a hydrogen atom, halogen atom, carboxyl group, sulfo group, cyano group, hydroxyl group, alkyl group having 10 or fewer carbon atoms, alkoxycarbonyl group having 10 or fewer carbon atoms, alkylsulfonylaminocarbonyl group having 10 or fewer carbon atoms, arylsulfonylaminocarbonyl group, alkylsulfonyl group, arylsulfonyl group, acylaminosulfonyl group having 10 or fewer carbon atoms, alkoxy group having 10 or fewer carbon atoms, alkylthio group having 10 or fewer carbon atoms, aryloxy group having 10 or fewer carbon atoms, nitro group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, acyloxy group having 10 or fewer carbon atoms, acyl group having 10 or fewer carbon atoms, carbamoyl group, sulfamoyl group, aryl group having 10 or fewer carbon atoms, substituted amino group, substituted ureido group, substituted phosphono group, or heterocyclic group. ｂ X represents a hydrogen atom or an alkyl group having 30 or fewer carbon atoms, and X represents a single bond, an ester group, an aliphatic alkyl chain having 30 or fewer carbon atoms, an aromatic chain, a polyethylene glycol chain, or a linking group formed by a combination thereof, and all of these may contain a spirodioxane ring. In equation (y1), s is a number between 1 and 6.

6. The colored layer forming composition according to claim 1 or 5, wherein the dye (A) comprises one or more selected from the group consisting of a first colorant, a second colorant, and a third colorant, the first colorant having an absorption maximum wavelength in the range of 470 to 530 nm and an absorption spectrum full width at half maximum of 15 to 45 nm, the second colorant having an absorption maximum wavelength in the range of 560 to 620 nm and an absorption spectrum full width at half maximum of 15 to 55 nm, and the third colorant having the wavelength with the lowest transmittance in the wavelength range of 380 to 780 nm in the range of 650 to 780 nm.

7. The colored layer forming composition according to claim 1 or 5, wherein the additive (D) comprises at least one singlet oxygen quencher and a peroxide decomposer.

8. The singlet oxygen quencher in the composition for forming a colored layer according to claim 7 contains one or more selected from the group consisting of dialkyldithiophosphate, dialkyldithiocarbamate, benzenedithiol, transition metal complexes thereof, and a compound represented by the following formula (2). [In the above formula (2), R 1 each independently represents an alkyl group, an alkenyl group, an aryl group, a heterocyclic group, R ９ CO － , R １０ SO ２ － , or R １１ NHCO － , R ９ , R １０ and R １１ each independently represent an alkyl group, an alkenyl group, an aryl group, or a heterocyclic group, R ２ and R ３ each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an alkoxy group, or an alkenyloxy group, and R ４ to R ８ each independently represent a hydrogen atom, an alkyl group, an alkenyl group, or an aryl group. ] 9. The colored layer-forming composition according to claim 1 or 5, wherein the dye (A) comprises one or more compounds selected from the group consisting of a porphyrin structure, azaporphyrin structure, merocyanine structure, phthalocyanine structure, azo structure, cyanine structure, squarylium structure, coumarin structure, polyene structure, quinone structure, tetradiporphyrin structure, pyromethene structure, and indigo structure, and one or more compounds selected from the group consisting of metal complexes thereof.

10. A colored layer for an optical laminate, which is a cured product of the colored layer forming composition according to claim 1 or 5.

11. An optical laminate comprising a sheet-like substrate, a functional layer formed on the first surface side of the substrate, and a colored layer formed on the second surface side of the substrate, which is a cured product of the colored layer forming composition according to claim 1 or 5.

12. The optical laminate according to claim 11, wherein the substrate or the functional layer is an ultraviolet absorbing layer having an ultraviolet shielding rate of 85% or more as measured in accordance with JIS L 1925.

13. The optical laminate according to claim 11, further comprising an ultraviolet absorbing layer between the substrate and the colored layer, wherein the ultraviolet shielding rate measured in accordance with JIS L 1925 is 85% or more.

14. The optical laminate according to claim 11, wherein the substrate comprises one or more selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, and polyimide.

15. The optical laminate according to claim 11, wherein the functional layer includes one or more selected from the group consisting of a hard coat layer, an anti-reflective layer including a high refractive index layer or a low reflectivity layer, and an anti-glare layer.

16. A display device comprising the optical laminate described in claim 11.

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