Light-absorbing filter, optical filter and method for manufacturing the same, display element intermediate product, display element, organic electroluminescence display device, inorganic electroluminescence display device, and liquid crystal display device

Abstract

A light-absorbing filter, a light filter using the light-absorbing filter, a manufacturing method thereof, a display element intermediate product, a display element, an OLED display device, an inorganic EL display device, and a liquid crystal display device, the light-absorbing filter including: a light-absorbing vanishing layer containing a resin, a dye having a main absorption wavelength band within a wavelength of 400 to 700 nm, and a compound generating a radical by ultraviolet irradiation; and a wavelength-selective absorption layer containing a resin, a dye having a main absorption wavelength band within a wavelength of 400 to 700 nm, and not containing a compound generating a radical by ultraviolet irradiation.

Description

Technical Field

[0001] This invention relates to a light absorption filter, a filter and its manufacturing method, intermediate products of display elements, display elements, organic electroluminescent display devices, inorganic electroluminescent display devices and liquid crystal display devices. Background Technology

[0002] As image display devices, organic light-emitting diode (OLED) display devices, inorganic light-emitting diode (inorganic EL) display devices, and liquid crystal display devices have been used in recent years.

[0003] Liquid crystal displays (LCDs) are increasingly used as image display devices that consume little power and save space. In an LCD, the liquid crystal panel itself, which displays the image, is a non-light-emitting element; therefore, a backlight unit is provided on the back of the liquid crystal panel to supply light to it. OLED display devices utilize the self-emissive nature of OLED display elements to display images. Therefore, compared to various display devices such as liquid crystal displays and plasma displays, they offer advantages such as high contrast ratio, high color reproduction, wide viewing angle, high-speed response, and thin and lightweight design. In addition to these advantages, from a flexible perspective, they are actively being researched and developed as a next-generation display device. Inorganic EL display devices are devices that use the self-emissive properties of inorganic EL display elements as fluorescent materials to display images, replacing the OLED display elements in OLED display devices. Recent research suggests the potential to achieve display devices that surpass OLED devices in terms of larger screen size and longer lifespan.

[0004] In the development of image display devices, there is a known technique that uses light absorption filters as structural components. For example, in liquid crystal display devices, when a white light-emitting diode (LED) is used as the light source for the backlight unit, a light absorption filter has been attempted to block light of unwanted wavelengths emitted from the white LED. Furthermore, in OLED display devices, from the viewpoint of suppressing external light reflection, a light absorption filter has been attempted. Patent Document 1 discloses a method for preventing external light reflection by combining multiple pigments with different maximum absorption wavelengths, without reducing the transmittance of the display light.

[0005] Another approach to assembling a light-absorbing filter into an image display device has been studied: a filter that combines a light-absorbing region with a light-absorbing region (hereinafter referred to as a "light-absorbing-disappearing region") by eliminating light absorption at the desired location. Typically, the non-display portion (the portion that does not emit display light, i.e., the non-emitting portion) of an OLED display device has metal wiring, etc., and therefore often has high reflectivity relative to the display portion (the portion that emits display light, i.e., the emitting portion). When assembling the filter into an image display device, by placing the aforementioned light-absorbing region on the non-display portion of the OLED display device and the aforementioned light-absorbing-disappearing region on the display portion of the OLED display device, the reduction in display light transmittance can be minimized, and the anti-reflection effect can be improved. For example, Patent Document 2 describes a light absorption filter containing a resin, a compound having an acid group, a compound that forms hydrogen bonds with the compound having an acid group and generates free radicals upon ultraviolet light irradiation, and a dye having a main absorption wavelength band in the wavelength range of 400 to 700 nm. According to the light absorption filter described in Patent Document 2, a high decolorization rate is exhibited due to ultraviolet light irradiation, and absorption originating from new coloring structures (hereinafter also referred to as "secondary absorption") accompanying dye decomposition due to ultraviolet light irradiation occurs almost non-existently, thus achieving high decolorization properties. Furthermore, Patent Document 3 describes a light absorption filter containing a resin, a dye having a main absorption wavelength band in the wavelength range of 400 to 700 nm, and a compound that generates free radicals upon ultraviolet light irradiation. The dye includes at least one of an azo dye represented by any one of general formulas (i) to (iv) and an indoleaniline dye represented by general formula (v). According to the light absorption filter described in the aforementioned Patent Document 3, it exhibits excellent decolorization even when exposed to ultraviolet light at room temperature, and the aforementioned secondary absorption caused by ultraviolet light irradiation hardly occurs, thus achieving high decolorization performance. Previous technical documents Patent documents

[0006] Patent Document 1: International Publication No. 2021 / 066082 Patent Document 2: International Publication No. 2023 / 068235 Patent Document 3: International Publication No. 2023 / 234353

[0007] However, the light absorption filter described in Patent Document 1 has the following problem: if the light absorption is increased to the point that the reflection of external light can be sufficiently suppressed, the transmittance of the displayed light is impaired. Furthermore, in the methods described in Patent Documents 2 and 3, the suppression of external light reflection caused by the display unit in the display device is insufficient, and improvements are required. Summary of the Invention The technical problem to be solved by the invention

[0008] That is, the objective of the present invention is to provide a light absorption filter having a portion with high light absorption and a portion with low light absorption at a desired location, and a filter that reduces reflectivity to a desired level without impairing the transmittance of the displayed light, and an intermediate product of a display element including the light absorption filter. Furthermore, the objective of this invention is to provide a filter using the aforementioned light absorption filter, which has a portion with high light absorption and a portion with low light absorption at a desired location, and to provide a filter that reduces reflectivity to a desired level without impairing the transmittance of the displayed light, a method for manufacturing the same, and an organic electroluminescent display device, an inorganic electroluminescent display device, and a liquid crystal display device equipped with the filter. Furthermore, the objective of this invention is to provide a display element obtained by mask exposure of the above-mentioned intermediate product of the display element, which has a portion with high light absorption and a portion with low light absorption at a desired location, and to provide a display element that reduces reflectivity to a desired level without impairing the transmittance of the display light, as well as an organic electroluminescent display device, an inorganic electroluminescent display device, and a liquid crystal display device equipped with the display element. means for solving technical problems

[0009] Based on in-depth research into the aforementioned issues, the inventors discovered that by configuring a filter that includes both a light absorption filter whose light absorption disappears upon ultraviolet irradiation and a light absorption filter whose light absorption remains unchanged upon ultraviolet irradiation, it is possible to impart both the absorption characteristics required for suppressing external light reflection from the display section of a display device and the absorption characteristics required for suppressing external light reflection from the non-display section into a single filter. This invention was completed based on further repeated research based on this insight.

[0010] That is, the above-mentioned problems were solved through the following solution. <1> An optical absorption filter, comprising: The light-absorbing fading layer contains a resin, a dye with a main absorption wavelength band in the wavelength range of 400–700 nm, and a compound that generates free radicals upon ultraviolet irradiation; and the wavelength-selective absorption layer contains a resin, a dye with a main absorption wavelength band in the wavelength range of 400–700 nm, and does not contain a compound that generates free radicals upon ultraviolet irradiation. <2> According to the light absorption filter described in <1>, the compound contained in the light absorption disappearance layer that generates free radicals by ultraviolet irradiation includes a combination of compound A and compound B having an acid group, wherein compound B has a structure capable of forming hydrogen bonds with the acid group contained in compound A. <3> According to the light absorption filter described in <2>, the compound A is chemically bonded to the polymer of the resin contained in the light absorption disappearance layer. <4> According to any one of <1> to <3>, in the light absorption filter, the dye contained in the light absorption fading layer undergoes a chemical change and becomes decolorized by ultraviolet irradiation. <5> A filter is formed by mask exposure of any one of <1> to <4> using ultraviolet light. <6> An intermediate product for a display element, comprising any one of <1> to <4>, a light absorption filter. <7> A display element is formed by mask exposure of the intermediate product of the display element described in <6> by ultraviolet irradiation. <8> An organic electroluminescent display device, an inorganic electroluminescent display device, or a liquid crystal display device, comprising the filter described in <5> or the display element described in <7>. <9> According to <8>, the organic electroluminescent display device, inorganic electroluminescent display device, or liquid crystal display device has a layer on the observer side relative to the filter described in <5> or the display element described in <7> that blocks the light absorption of the compound that generates free radicals by ultraviolet irradiation. <10> A method for manufacturing a filter includes the following steps: irradiating the light absorption filter according to any one of <1> to <4> with ultraviolet light for mask exposure.

[0011] In this invention, when multiple substituents or linking groups (hereinafter referred to as substituents, etc.) represented by specific symbols or formulas are present, or when multiple substituents, etc. are specified simultaneously, unless otherwise specified, each substituent, etc., may be identical or different from each other. The same applies to the number of substituents, etc. Furthermore, when multiple substituents, etc., are close together (especially adjacent), unless otherwise specified, they may connect with each other to form a ring. Furthermore, unless otherwise specified, rings such as alicyclic rings, aromatic rings, and heterocyclic rings may further fuse to form fused rings. In this invention, unless otherwise specified, the components constituting the light absorption vanishing layer of the light absorption filter (resin, dye, compounds that generate free radicals by ultraviolet irradiation, and other suitable components, etc.) may each contain one or more of these components in the light absorption vanishing layer of the light absorption filter. Furthermore, in this invention, the components constituting the wavelength selective absorption layer of the light absorption filter (resin, dye, and other suitable components, etc.) may each contain one or more of these components in the wavelength selective absorption layer of the light absorption filter. The same meaning applies to filters made using the light absorption filter of this invention. The filter of the present invention is preferably applicable to the light absorption filter described herein, except that the layer corresponding to the light absorption vanishing layer in the light absorption filter has a light absorption vanishing region formed by ultraviolet irradiation. Unless otherwise specified, the filter of the present invention is preferably applicable to the light absorption filter described herein. In this invention, regarding double bonds, unless otherwise stated, in the case of E-type and Z-type double bonds present in the molecule, either one can be used, and a mixture thereof can also be used. In this invention, the designation of a compound (including complexes) includes not only the compound itself but also its salts and ions. Furthermore, it refers to a compound whose structure has been modified to a degree that does not impair the effects of this invention. Additionally, the term "compound without explicit substitution" refers to compounds that may have any number of substituents without impairing the effects of this invention. This also applies to substituents and linking groups. Furthermore, in this invention, the numerical range represented by “~” refers to the range encompassed by the values ​​recorded before and after “~” as the lower and upper limits. In this invention, the composition includes not only a mixture with a constant concentration of components (in which the components are uniformly dispersed), but also a mixture in which the concentration of components varies within a range that does not impair the target function. In this invention, having a main absorption wavelength band within the wavelength range of XX to YY nm means that the wavelength exhibiting maximum absorption (i.e., the maximum absorption wavelength) exists within the wavelength range of XX to YY nm. Therefore, if the maximum absorption wavelength is within the aforementioned wavelength range, the entire absorption band including that wavelength can be within the aforementioned wavelength range or can extend outside of it. Furthermore, when multiple maximum absorption wavelengths exist, it is sufficient that the maximum absorption wavelength exhibiting the maximum absorbance exists within the aforementioned wavelength range. That is, maximum absorption wavelengths other than the maximum absorption wavelength exhibiting the maximum absorbance can exist anywhere within or outside the aforementioned wavelength range of XX to YY nm. In this invention, "(meth)acrylate" means any one or both of acrylate and methacrylate, "(meth)acrylic acid" means any one or both of acrylic acid and methacrylic acid, and "(meth)acryloyl" means any one or both of acryloyl and methacryloyl. Invention Effects

[0012] The light absorption filter of the present invention has portions with different light absorption properties at desired locations, enabling a filter that reduces reflectivity to the desired level without impairing the transmittance of the displayed light. Furthermore, the filter of the present invention has portions with different light absorption at desired locations, and reduces reflectivity to the desired level without impairing the transmittance of the displayed light. Furthermore, the organic electroluminescent display device, inorganic electroluminescent display device, and liquid crystal display device of the present invention are equipped with the filter of the present invention. Furthermore, the intermediate product of the display element of the present invention includes the light absorption filter of the present invention, and the organic electroluminescent display device, inorganic electroluminescent display device and liquid crystal display device that include the display element obtained by mask exposure of the intermediate product of the display element are equipped with the filter of the present invention. The filter of the present invention can be preferably manufactured using the manufacturing method of the present invention. Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating one embodiment of a liquid crystal display device having the filter of the present invention. Detailed Implementation

[0014] [Optical Absorption Filter] The optical absorption filter of the present invention comprises: a light absorption vanishing layer containing a resin, a dye having a main absorption wavelength band in the wavelength range of 400-700 nm, and a compound that generates free radicals upon ultraviolet irradiation; and The wavelength-selective absorption layer contains a resin, a dye with a main absorption wavelength band in the wavelength range of 400–700 nm, and does not contain compounds that generate free radicals when exposed to ultraviolet light.

[0015] In this invention, the main absorption wavelength band of the dye refers to the main absorption wavelength band of the dye measured under the condition of an optical absorption filter. Specifically, in the embodiments described later, the measurement is performed under the condition of an optical absorption filter with a substrate, using the conditions described in the section on absorbance of the optical absorption filter. In the light absorption filter of the present invention, the aforementioned "dye" is dispersed (preferably dissolved) in the aforementioned resin contained in the same layer (light absorption vanishing layer or wavelength selective absorption layer), thereby setting the light absorption filter as a filter that displays a specific absorption spectrum originating from the dye. This dispersion can be any of random, regular, etc.

[0016] In the light absorption fading layer constituting the light absorption filter of the present invention, a compound that generates free radicals upon ultraviolet irradiation is dispersed (preferably dissolved) in the resin. This generates free radicals under ultraviolet irradiation, which react with the dye, causing a chemical change in the dye and thus fading and decolorizing it. In other words, the light absorption fading layer constituting the light absorption filter of the present invention is a layer that possesses the characteristic of decolorizing by undergoing a chemical change in the dye contained in the light absorption fading layer upon ultraviolet irradiation.

[0017] Furthermore, in the light absorption disappearance layer constituting the light absorption filter of the present invention, as described later, when the compound that generates free radicals by ultraviolet irradiation contains compound A having an acid group and compound B having a structure capable of forming hydrogen bonds with the acid group contained in compound A, the generation efficiency of free radical species generated by ultraviolet irradiation is improved compared to the use of commonly used photoradioactive agents such as benzophenone compounds. Therefore, even when ultraviolet irradiation is performed under mild temperature conditions such as room temperature, sufficient free radical species are generated, which directly or indirectly react with the dye to decompose the dye, thereby causing the dye to fade or decolorize. Furthermore, in the light absorption fading layer constituting the light absorption filter of the present invention, when compound A having an acid group is bonded to the polymer of the resin contained in the light absorption fading layer, it exerts the effect of generating free radicals near the dye when irradiated with ultraviolet light, and the free radicals readily react with the dye. Furthermore, the "compound B having a structure capable of forming hydrogen bonds with the aforementioned acid groups contained in compound A" described later is dispersed (preferably dissolved) in the resin by forming hydrogen bonds with compound A, or forms hydrogen bonds with compound A in the resin when compound A containing the aforementioned acid groups is bonded to the polymer constituting the resin, and generates free radicals when irradiated with ultraviolet light. The mechanism by which the generated free radicals react with nearby dyes is such that the free radicals readily react with the dyes, enabling more efficient fading and decolorization of the dyes. The light absorption vanishing layer constituting the light absorption filter of the present invention will be described in detail below.

[0018] <<Light Absorption Vanishing Layer>> <Dyes with a main absorption wavelength band in the wavelength range of 400–700 nm> Specific examples of dyes that have a main absorption wavelength band in the wavelength range of 400 to 700 nm, used in the light absorption vanishing layer of the light absorption filter of the present invention, include various pigments (dyes) of squaraine (SQ), cyanine (CY), benzylene, cinnamylene, azo, and indoleaniline.

[0019] From the viewpoint of minimizing the formation of secondary coloring structures associated with dye decomposition, the aforementioned light-absorbing fading layer preferably contains at least one of an azo dye represented by any one of general formulas (i) to (iv) described below and an indoleaniline dye represented by general formula (v) described below. The azo dye represented by general formula (i) is a dye having a main absorption wavelength band in the wavelength region of approximately 400 to 500 nm; the azo dye represented by any one of general formulas (ii) to (iv) described below is a dye having a main absorption wavelength band in the wavelength region of approximately 450 to 650 nm; and the indoleaniline dye represented by general formula (v) described below is a dye having a main absorption wavelength band in the wavelength region of approximately 580 to 700 nm. In this configuration of the light-absorbing fading layer, excellent achromaticity is exhibited under ultraviolet irradiation.

[0020] The light absorption disappearance layer may contain one or more of the following pigments: azo pigment represented by general formula (i), azo pigment represented by general formula (ii), azo pigment represented by general formula (iii), azo pigment represented by general formula (iv), and indoleaniline pigment represented by general formula (v). The aforementioned light absorption vanishing layer may contain squaric acid cyanine pigment represented by general formula (1) as described in the wavelength-selective absorption layer described later. The aforementioned light absorption eliminator layer can also contain dyes other than azo dyes represented by any of these general formulas (i) to (iv), indoleaniline dyes represented by general formula (v), and squaric acid cyanine dyes represented by general formula (1) described later. By optimizing the mixing ratio of azo dyes represented by any of these general formulas (i) to (iv) and indoleaniline dyes represented by general formula (v) described later, and combining them with the wavelength-selective absorption layer described later, it is possible to suppress the change in the hue of reflected light compared to the case without dyes (hereinafter also referred to as "adjusting the hue of reflected light to be more neutral").

[0021] From the viewpoint that it is easier to achieve both suppression of external light reflection and suppression of brightness reduction, the aforementioned light absorption vanishing layer preferably contains dyes that have the main absorption wavelength bands of each dye contained in the wavelength selective absorption layer described later, and have absorption in the wavelength region with low absorbance. Specifically, the aforementioned light absorption vanishing layer preferably contains a dye having a main absorption wavelength band that is more than 5 nm away from any one of the main absorption wavelength bands of the dyes contained in the wavelength selective absorption layer described later. In an embodiment applicable to an OLED display device, the "dye" contained in the light absorption eliminator layer preferably includes at least one of the following dyes E to G that have a main absorption wavelength band in different wavelength regions. Dye E: A dye with a main absorption wavelength band in the wavelength range of 430–480 nm. Dye F: A dye with a main absorption wavelength band in the wavelength range of 500–570 nm. Dye G: A dye with a main absorption wavelength band in the wavelength range of 600–660 nm. Furthermore, the light-absorbing fading layer may contain one or more types of dye E. Similarly, the light-absorbing fading layer may contain one or more types of dyes F and G, respectively. The wavelength range of the main absorption wavelength band of the dye E is preferably 430-475 nm, more preferably 430-470 nm, and even more preferably 430-465 nm. The wavelength range of the main absorption wavelength band of the dye F is preferably 505-560 nm, more preferably 510-555 nm, and even more preferably 515-555 nm. The wavelength range of the main absorption wavelength band of the dye G is preferably 610-655 nm, more preferably 610-650 nm, and even more preferably 610-640 nm. The aforementioned light absorption fading layer can also contain dyes other than dyes E to G.

[0022] In particular, from the viewpoint of combining with the wavelength-selective absorption layer described later, dye E, dye F, and dye G are preferably a combination of at least two types, and more preferably contain all three types. From the viewpoint of achieving a higher degree of suppression of external light reflection and brightness reduction of the filter, and of being able to adjust the hue of reflected light to be more neutral when the obtained filter is applied to a display device, it is preferable that the wavelength-selective absorption layer described later contains all of dyes A to D described later, and that the light absorption annihilation layer contains all of dyes E to G. In relation to the dyes that may be contained in the wavelength-selective absorption layer described later, the main absorption wavelength band of the dye E described above is preferably 5 to 70 nm (more preferably 5 to 60 nm) away from the main absorption wavelength band of the dye A described later, and 5 to 80 nm (more preferably 10 to 80 nm) away from the main absorption wavelength band of the dye B described later. Furthermore, the main absorption wavelength band of the dye F is preferably 5 to 60 nm (more preferably 10 to 50 nm) away from the main absorption wavelength band of the dye B described later, and is also 5 to 60 nm (more preferably 10 to 50 nm) away from the main absorption wavelength band of the dye C described later. Furthermore, the main absorption wavelength band of the dye G is preferably 5 to 60 nm (more preferably 10 to 50 nm) away from the main absorption wavelength band of the dye C described later, and is 5 to 80 nm (more preferably 10 to 60 nm) away from the main absorption wavelength band of the dye D described later.

[0023] In this invention, in the pigments represented by the following general formulas, the cation exists in a delocalized manner, and multiple tautomer structures exist. Therefore, in this invention, a pigment is defined as a pigment represented by each general formula if at least one tautomer structure of the pigment is applicable to each general formula. Therefore, a pigment represented by a specific general formula can also be called a pigment capable of having at least one tautomer structure represented by a specific general formula. In this invention, a pigment represented by a general formula can adopt any tautomer structure as long as at least one of its tautomer structures is applicable to the general formula.

[0024] (1-1) Azo dyes represented by the following general formula (i).

[0025] [Chemical Formula 1]

[0026] In the above formula, R 17 and R 18 Each can be used to independently represent a hydrogen atom or a monovalent substituent. R 19It represents a hydrogen atom, an aliphatic group, an aryl group, a heterocyclic group, a carbamoyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyl group, an alkylsulfonyl group, an arylsulfonyl group, or an aminosulfonyl group. Q represents a diazo component residue.

[0027] As can be used as R 17 and R 18 Examples of monovalent substituents include halogen atoms, aliphatic groups, aryl groups, heterocyclic groups, cyano groups, carboxyl groups, carbamoyl groups, aliphatic oxygen carbonyl groups, aryloxy carbonyl groups, acyl groups, hydroxyl groups, aliphatic oxygen groups, aryloxy groups, acyloxy groups, carbamoyloxy groups, heterocyclic oxygen groups, amino groups (-NH2), aliphatic amino groups, aryl amino groups, heterocyclic amino groups, acylamino groups, carbamoylamino groups, aminosulfonylamino groups, aliphatic oxygen carbonylamino groups, aryloxy carbonylamino groups, aliphatic sulfonylamino groups, aryl sulfonylamino groups, nitro groups, aliphatic thio groups, aryl thio groups, aliphatic sulfonyl groups, aryl sulfonyl groups, aminosulfonyl groups, sulfonyl groups, imide groups, and heterocyclic thio groups. Among these, from the viewpoint of primarily imparting solubility, aliphatic groups, aryl groups, heterocyclic groups, cyano groups, carbamoyl groups, aliphatic oxygen carbonyl groups, aryloxy carbonyl groups, acyl groups, aliphatic oxygen groups, aryloxy groups, aliphatic amino groups, or aryl amino groups are preferred. These can be used as R 17 and R 18 The substituents can be further replaced.

[0028] Can be used as R 17 ~R 19 The aliphatic group may further have monovalent substituents, which may be saturated, unsaturated, or cyclic. Specifically, examples include alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, substituted alkynyl, aralkyl, and substituted aralkyl groups. The total number of carbon atoms in the aliphatic group is preferably 1 to 30, more preferably 1 to 16. Specific examples of aliphatic groups include methyl, ethyl, butyl, isopropyl, tert-butyl, hydroxyethyl, methoxyethyl, cyanoethyl, trifluoromethyl, 3-sulfopropyl, 4-sulfobutyl, 2-(2-hydroxyethoxy)ethyl, 2-(2-(acetoxy)ethoxy)ethyl, cyclohexyl, benzyl, 2-phenylethyl, vinyl, and allyl groups. Furthermore, as a possible monovalent substituent, examples of substituents that can be used as R can be cited. 17 and R 18 The same applies to the following description regarding the monovalent substituents that may be present. Alkoxy, acyloxy, hydroxyl, etc., are preferred examples of possible monovalent substituents. Furthermore, these substituents may further have substituents, for example, alkoxy, acyloxy, hydroxyl, etc. are preferred examples.

[0029] Can be used as R 17 ~R 19The aryl group may further have monovalent substituents, preferably aryl groups with a total carbon number of 6 to 30, more preferably aryl groups with 6 to 16 carbon atoms. Specifically, examples include phenyl, 4-tolyl, 4-methoxyphenyl, 2-chlorophenyl, 3-(3-sulfopropylamino)phenyl, 4-aminosulfonylphenyl, 4-(ethoxyethylaminosulfonyl)phenyl, and 3-(dimethylcarbamoyl)phenyl.

[0030] As can be used as R 17 ~R 19 The heterocyclic group can be a saturated or unsaturated aliphatic cyclic group or an aromatic cyclic group, preferably an aromatic heterocyclic group. Examples of ring-forming atoms constituting the heterocyclic group include ring-forming atoms containing at least one of heteroatoms such as nitrogen, sulfur, and oxygen atoms. It may further have monovalent substituents, and is preferably a heterocyclic group with a total carbon number of 1 to 30, more preferably a heterocyclic group with 1 to 15. Specifically, examples include 2-pyridyl, 2-thienyl, 2-thiazolyl, 2-benzothiazolyl, 2-benzoxazolyl, and 2-furanyl.

[0031] As can be used as R 17 ~R 19 The carbamoyl group, in addition to the unsubstituted carbamoyl group (-CONH2), also includes carbamoyl groups substituted by aliphatic groups, aryl groups, etc. Can be used as R 17 ~R 19 The carbamoyl group may further have a monovalent substituent, preferably a carbamoyl group with a total carbon number of 1 to 30, more preferably a carbamoyl group with a carbon number of 1 to 16. Specifically, examples include methylcarbamoyl, dimethylcarbamoyl, phenylcarbamoyl, and N-methyl-N-phenylcarbamoyl.

[0032] As can be used as R 17 and R 18 The aliphatic group in the aliphatic oxygen carbonyl group can be used as R 17 ~R 19 The record of aliphatic groups. Can be used as R 17 and R 18 The aliphatic oxygen carbonyl group may further have monovalent substituents, which may be saturated, unsaturated, or cyclic. Preferably, it is an aliphatic oxygen carbonyl group with a total carbon number of 2 to 30, and more preferably, it is an aliphatic oxygen carbonyl group with a total carbon number of 2 to 16. Specifically, examples include methoxycarbonyl, ethoxycarbonyl, and 2-methoxyethoxycarbonyl. Can be used as R 19The alkoxycarbonyl group may further have monovalent substituents, which may be saturated, unsaturated, or cyclic. Preferably, it is an alkoxycarbonyl group with a total carbon number of 2 to 30, and more preferably, it is an alkoxycarbonyl group with a total carbon number of 2 to 16. Specifically, examples include methoxycarbonyl, ethoxycarbonyl, and 2-methoxyethoxycarbonyl.

[0033] Can be used as R 17 ~R 19 The aryloxycarbonyl group may further have monovalent substituents, preferably aryloxycarbonyl groups with a total carbon number of 7 to 30, and more preferably aryloxycarbonyl groups with a carbon number of 7 to 16. Specifically, examples include phenoxycarbonyl, 4-methylphenoxycarbonyl, and 3-chlorophenoxycarbonyl.

[0034] In which it can be used as R 17 ~R 19 The acyl group includes aliphatic carbonyl, aryl carbonyl, and heterocyclic carbonyl groups, preferably with a total carbon number of 1 to 30, and more preferably with a total carbon number of 1 to 16. Specifically, examples include acetyl, methoxyacetyl, thienoyl, and benzoyl groups.

[0035] As can be used as R 17 and R 18 The aliphatic group in the aliphatic sulfonyl group can be used as R 17 ~R 19 The record of aliphatic groups. Can be used as R 17 and R 18 The aliphatic sulfonyl group may further have a monovalent substituent, which may be saturated, unsaturated, or cyclic, preferably with a total carbon number of 1 to 30, more preferably with a total carbon number of 1 to 16. Specifically, examples include methanesulfonyl, methoxymethanesulfonyl, and ethoxyethanesulfonyl. Can be used as R 19 The alkyl sulfonyl group may further have a monovalent substituent, which may be saturated, unsaturated, or cyclic, preferably with a total carbon number of 1 to 30, more preferably with a total carbon number of 1 to 16. Specifically, examples include methanesulfonyl, methoxymethanesulfonyl, and ethoxyethanesulfonyl.

[0036] Can be used as R 17 ~R 19 The arylsulfonyl group may further have monovalent substituents, preferably in the form of 6 to 30 total carbon atoms, more preferably in the form of 6 to 18 total carbon atoms. Specifically, examples include benzenesulfonyl and toluenesulfonyl groups.

[0037] As can be used as R 17 ~R19 The aminosulfonyl group, in addition to the unsubstituted aminosulfonyl group (-SO2NH2), also includes aminosulfonyl groups substituted by aliphatic groups, aryl groups, etc. Can be used as R 17 ~R 19 The aminosulfonyl group may further have a monovalent substituent, preferably in a manner with a total carbon number of 0 to 30, more preferably in a manner with a total carbon number of 0 to 16. Specifically, examples include unsubstituted aminosulfonyl groups, dimethylaminosulfonyl groups, and di-(2-hydroxyethyl)aminosulfonyl groups.

[0038] Can be used as R 17 and R 18 The imide group may further have a monovalent substituent, preferably a 5- or 6-membered ring imide group. Furthermore, it is preferable that the total number of carbon atoms in the imide group is 4 to 30, more preferably 4 to 20. Specifically, examples include succinimide and phthalimide groups.

[0039] As can be used as R 17 and R 18 The aliphatic groups in aliphatic oxygen, aliphatic amino, aliphatic amino, aliphatic oxycarbonyl amino, aliphatic sulfonyl amino, and aliphatic thio groups are suitable for use as R 17 ~R 19 The record of aliphatic groups. As can be used as R 17 and R 18 The aryl groups in aryloxy, arylamino, aryloxycarbonylamino, arylsulfonylamino, and arylthioyl groups are suitable for use as R 17 ~R 19 Records of aryl compounds. As can be used as R 17 and R 18 The acyl group in the acyloxy and acylamino groups can be used as R 17 ~R 19 The record of the acyl group. As can be used as R 17 and R 18 The carbamoyl group in carbamoyloxy and carbamoylamino can be used as R 17 ~R 19 The record of the carbamoyl group. As can be used as R 17 and R 18 The heterocyclic groups in heterocyclic oxygen, heterocyclic amino, and heterocyclic thio groups are suitable for use as R 17 ~R 19 The record of heterocyclic groups. As can be used as R 17 and R18 The aminosulfonyl group in aminosulfonylamino can be used as R 17 ~R 19 The record of aminosulfonyl group.

[0040] The diazo component residue represented by Q refers to the residue of the diazo component "Q-NH2". In particular, from the viewpoint of adjusting the hue of the target reflected light to be more neutral, Q is preferably an aryl or aromatic heterocyclic group. The aromatic hydrocarbon ring constituting the aryl group that can be used as Q can be a monocyclic or a fused ring, preferably a monocyclic ring. Aryl groups with a total carbon number of 6 to 30 are preferred, more preferably 6 to 16. Specifically, phenyl is preferred. The aryl group that can be used as Q can have substituents; preferred substituents include aminosulfonyl (preferably alkylaminosulfonyl or dialkylaminosulfonyl), sulfonyl (preferably alkylsulfonyl), and cyano.

[0041] The aromatic heterocyclic group that can be used as Q is preferably an aromatic cyclic group containing at least one of the heteroatoms such as nitrogen, sulfur, and oxygen as ring-forming atoms, and is composed of 5- to 6-membered rings. The number of carbon atoms in the aromatic heterocyclic group is preferably 1 to 25, more preferably 1 to 15. The aromatic heterocycle constituting the aromatic heterocyclic group can be a monocyclic or a fused ring, but is preferably a monocyclic. As aromatic heterocyclic groups, examples include pyrazolyl, 1,2,4-triazolyl, isothiazolyl, benzoisothiazolyl, thiazolyl, benzothiazolyl, oxazolyl, 1,2,4-thiadiazolyl, etc.

[0042] As an example of an azo pigment represented by the above general formula (i), for example, the specific examples of azo pigments represented by general formula (i) described in paragraph

[0042] of International Publication No. 2023 / 234353 can be directly applied. However, the present invention is not limited to these.

[0043] (1-2) Azo dyes represented by the following general formula (ii).

[0044] [Chemical Formula 2]

[0045] In the above formula, R 21 ~R 24 R 26 and R 27 Represents hydrogen atom, halogen atom, cyano group, nitro group, carboxyl group, sulfonyl group, -OR 108 -SR 109 -NR 110 R 111 -S(=O)2NR 112 R 113-C(=O)NR 114 R 115 -NHC(=O)R 116 -C (=O) OR 117 -O (CH2CH2O) n R 118 -O(CH2CH2S) n R 119 -S(CH2CH2O) n R 120 -S (CH2CH2S) n R 121 Acyclic hydrocarbon groups, monocyclic hydrocarbon groups, fused polycyclic hydrocarbon groups, or heterocyclic groups. R 108 ~R 121 This represents a hydrogen atom, an acyclic hydrocarbon group, a monocyclic hydrocarbon group, a fused polycyclic hydrocarbon group, or a heterocyclic group. n is a positive integer. In addition, acyclic hydrocarbon groups, monocyclic hydrocarbon groups, fused polycyclic hydrocarbon groups, and heterocyclic groups can have halogen atoms, cyano groups, nitro groups, carboxyl groups, sulfonyl groups, and -OR groups. 108 -SR 109 -NR 110 R 111 -S(=O)2NR 112 R 113 -C(=O)NR 114 R 115 -NHC(=O)R 116 -C (=O) OR 117 -O (CH2CH2O) n R 118 -O(CH2CH2S) n R 119 -S(CH2CH2O) n R 120 -S (CH2CH2S) n R 121 One or more of the following can be used as substituents: acyclic hydrocarbon groups, monocyclic hydrocarbon groups, fused polycyclic hydrocarbon groups, and heterocyclic groups.

[0046] Can be used as R 21 ~R 24 R 26 R 27 and R 108 ~R 121 Acyclic hydrocarbon groups refer to acyclic alkyl groups obtained by removing one hydrogen atom from an acyclic alkane. However, acyclic alkyl groups can have a cyclic structure as a substituent. The number of carbon atoms in the acyclic alkyl group is preferably 1 to 30, more preferably 1 to 20, even more preferably 1 to 12, particularly preferably 1 to 8, and most preferably 1 to 6. Can be used as R 21 ~R 24 R 26 R 27 and R 108 ~R 121 A monocyclic hydrocarbon group refers to a group obtained by removing one hydrogen atom from a monocyclic aliphatic hydrocarbon ring (which can be any of monocyclic cycloalkanes, monocyclic cycloolefins, and monocyclic cycloalkynes) or a monocyclic aromatic hydrocarbon ring; that is, a monocyclic cycloalkyl, monocyclic cycloalkenyl, monocyclic cycloalkynyl, or monocyclic aryl group. Regarding the number of carbon atoms in monocyclic cycloalkyl, monocyclic cycloalkenyl, and monocyclic cycloynyl groups, the structure is not particularly limited as much as possible, but 3 to 30 is more preferred, 3 to 20 is more preferred, and 3 to 16 is even more preferred. The number of carbon atoms in monocyclic aryl groups is more preferred to be 6 to 30, more preferred to be 6 to 20, and particularly preferred to be 6 to 16. Can be used as R 21 ~R 24 R 26 R 27 and R 108 ~R 121 A fused polycyclic hydrocarbon group refers to a group obtained by removing one hydrogen atom from a fused polycyclic aliphatic hydrocarbon ring (which can be any of a fused polycyclic cycloalkanes, fused polycyclic cycloolefins, and fused polycyclic cycloalkynes) or a fused polycyclic aromatic hydrocarbon ring; that is, a fused polycyclic cycloalkyl, a fused polycyclic cycloalkenyl, a fused polycyclic cycloalkynyl, or a fused polycyclic aryl. Regarding the number of carbon atoms in fused polycyclic cycloalkyl, fused polycyclic cycloalkenyl, and fused polycyclic cycloynyl groups, the structure is not particularly limited as much as possible, but 8 to 30 is more preferred, and 8 to 20 is even more preferred. The number of carbon atoms in fused polycyclic aryl groups is more preferred to be 10 to 30, and more preferred to be 10 to 20. As can be used as R 21 ~R 24 R 26 R 27 and R 108 ~R 121 The heterocyclic group can be used as R in the above general formula (i). 17 ~R 19 The record of heterocyclic groups. n is preferably an integer from 1 to 12, more preferably an integer from 1 to 6, and even more preferably an integer from 1 to 3.

[0047] Regarding the specific substituents in general formula (ii), unless otherwise specified, the groups described in Japanese Patent Application Publication No. 5-257180 and the R groups of compounds represented by general formula [1] can be compared. 1 ~R 4 R6 R 7 R 8 ~R 21 The relevant records apply directly to R 21 ~R 24 R 26 R 27 R 108 ~R 121 .

[0048] R 21 Preferred groups: cyano, nitro, -OR 108 A noncyclic hydrocarbon group (preferably a noncyclic alkyl or a noncyclic alkenyl) or heterocyclic group, more preferably cyano or nitro, or a noncyclic alkyl group substituted with a halogen atom (preferably an alkyl group substituted with a fluorine atom), and even more preferably cyano. R 22 The preferred radicals are hydrogen atom, cyano group, non-cyclic hydrocarbon group (preferably non-cyclic alkyl) or monocyclic hydrocarbon group, more preferably hydrogen atom, alkyl or aryl, and even more preferably alkyl or aryl. Additionally, R 21 and R 22 At least one of them is preferably a cyano or nitro group, or an acyclic alkyl group substituted with a halogen atom, cyano or nitro group. R 23 Preferred hydrogen atoms, -OR 108 -SR 109 -NR 110 R 111 -C(=O)NR 114 R 115 -NHC(=O)R 116 -O (CH2CH2O) n R 118 -O(CH2CH2S) n R 119 -S(CH2CH2O) n R 120 -S (CH2CH2S) n R 121 Or a noncyclic hydrocarbon group (preferably a noncyclic alkyl group), more preferably a hydrogen atom, -OR 108 -SR 109 -NR 110 R 111 -NHC(=O)R 116 Or acyclic alkyl, more preferably -NHC(=O)R 116 Here, R 108 ~R 111 R 116 R 118 ~R 121 Acyclic alkyl groups are preferred. R 24 and R 27 Hydrogen atoms are preferred. R 26 Preferred hydrogen atoms, -OR 108 -SR 109 -NR 110 R 111 -NHC(=O)R 116 -O (CH2CH2O) n R 118 -O(CH2CH2S) n R 119 -S(CH2CH2O) n R 120 -S (CH2CH2S) n R 121 Or a noncyclic hydrocarbon group (preferably a noncyclic alkyl group), more preferably a hydrogen atom, -OR 108 or -SR 109 Further optimization of hydrogen atoms. Here, R 108 ~R 111 R 116 R 118 ~R 121 Acyclic alkyl groups are preferred. In relation to R 24 and R 26 -NR located in the adjacent position 110 R 111 In the middle, R 110 Preferred acyclic alkyl group, R 111 Preferably acyclic alkyl, more preferably unsubstituted acyclic alkyl, or having -OR 108 Acyclic alkyl groups with monocyclic or fused polycyclic hydrocarbon groups as substituents. Here, R... 108 Hydrogen atoms or acyclic alkyl groups are preferred.

[0049] As specific examples of pigments represented by general formula (ii), in addition to the compounds used in the examples described below, examples may include compounds described in paragraphs

[0023] to

[0034] of Japanese Patent Application Publication No. 5-257180, compounds described in paragraphs

[0050] and

[0052] , compound D-18 described in paragraph

[0055] , and compounds described in paragraph

[0056] of Japanese Patent Application Publication No. 2013-129712. However, the present invention is not limited to these.

[0050] (1-3) Azo dyes represented by the following general formula (iii).

[0051] [Chemical Formula 3]

[0052] In the above formula, R 31 It represents a hydrogen atom, alkyl group, alkoxy group, cyano group, carbonyl group (preferably alkoxycarbonyl or aryloxycarbonyl), aromatic group or heterocyclic group. R 32 It represents a hydrogen atom, alkyl group, alkoxy group, cyano group, nitro group, carbonyl group (preferably alkoxycarbonyl or aryloxycarbonyl), aromatic group or heterocyclic group. R 34 and R 35 Each can be represented independently as a hydrogen atom, alkyl group, or aromatic group. R 37 It represents a hydrogen atom, alkyl group, alkoxy group, cyano group, carbonyl group (preferably alkoxycarbonyl or aryloxycarbonyl), amide group, or aromatic group. R 34 With R 35 They can bond together to form a ring.

[0053] Regarding the definitions and preferred ranges of each substituent in general formula (iii), unless otherwise specified, the information described in Japanese Patent Application Publication No. 2013-129712 can be compared with that of R in general formula (1). 1 and R 2 The relevant records apply directly to R. 31 and R 32 The R mentioned in Japanese Patent Application Publication No. 2013-129712 and the general formula (3) 4 R 5 and R 7 The relevant records apply directly to R. 34 R 35 and R 37 . Furthermore, in this invention, regarding R... 37 Except for R related to general formula (3) as recorded in Japanese Patent Application Publication No. 2013-129712 7 In addition to hydrogen atoms, alkyl groups, alkoxy groups, cyano groups, carbonyl groups, and aromatic groups, the following amide groups can also be used. Can be used as R 37 The number of carbon atoms in the amide group is preferably 1 to 12, more preferably 1 to 6. In this invention, it can be used as R 31 R 32 and R 37 The alkyl group has a more preferred number of carbon atoms of 1 to 20, a further preferred number of 1 to 12, and a particularly preferred number of 1 to 6. Can be used as R 31 R 32 and R 37The number of carbon atoms in the alkoxy group is more preferably 1 to 20, further preferably 1 to 12, and particularly preferably 1 to 6. Can be used as R 31 R 32 and R 37 The number of carbon atoms in the alkoxycarbonyl group is preferably 2 to 30, more preferably 2 to 20, even more preferably 2 to 12, and particularly preferably 2 to 7. Can be used as R 34 and R 35 The alkyl group preferably has 1 to 30 carbon atoms, more preferably 1 to 20, and even more preferably 1 to 12.

[0054] R 31 Alkyl or aryl is preferred, with alkyl being more preferred. R 32 Alkyl or cyano groups are preferred, with cyano groups being more preferred. R 34 and R 35 Hydrogen atoms or alkyl groups are preferred, with alkyl groups being more preferred. R 37 Preferred groups include hydrogen atoms, alkyl groups, amide groups, or aromatic groups, more preferably hydrogen atoms or alkyl groups, and even more preferably alkyl groups.

[0055] As a specific example of a pigment represented by general formula (iii), for example, the specific examples of azo pigments represented by general formula (iii) described in paragraphs

[0056] to

[0058] of International Publication No. 2023 / 234353 can be directly applied. However, the present invention is not limited to these.

[0056] (1-4) Azo dyes represented by the following general formula (iv).

[0057] [Chemical Formula 4]

[0058] In the above formula, R 41 ~R 44 R 46 and R 47 Represents hydrogen atom, halogen atom, cyano group, nitro group, carboxyl group, sulfonyl group, -OR 208 -SR 209 -NR 210 R 211 -S(=O)2NR 212 R 213 -C(=O)NR 214 R 215 -NHC(=O)R 216 -C (=O) OR 217 -O (CH2CH2O) n R 218-O(CH2CH2S) n R 219 -S(CH2CH2O) n R 220 -S (CH2CH2S) n R 221 Acyclic hydrocarbon groups, monocyclic hydrocarbon groups, fused polycyclic hydrocarbon groups, or heterocyclic groups. R 208 ~R 221 This represents a hydrogen atom, an acyclic hydrocarbon group, a monocyclic hydrocarbon group, a fused polycyclic hydrocarbon group, or a heterocyclic group. n is a positive integer. In addition, acyclic hydrocarbon groups, monocyclic hydrocarbon groups, fused polycyclic hydrocarbon groups, and heterocyclic groups can have halogen atoms, cyano groups, nitro groups, carboxyl groups, sulfonyl groups, and -OR groups. 208 -SR 209 -NR 210 R 211 -S(=O)2NR 212 R 213 -C(=O)NR 214 R 215 -NHC(=O)R 216 -C (=O) OR 217 -O (CH2CH2O) n R 218 -O(CH2CH2S) n R 219 -S(CH2CH2O) n R 220 and -S (CH2CH2S) n R 221 One or more of them are used as substituents.

[0059] Regarding R in general formula (iv) 41 ~R 44 R 46 R 47 R 208 ~R 221 And n, unless otherwise specified, can be directly applied to R in the above general formula (ii). 21 ~R 24 R 26 R 27 R 108 ~R 121 And the record of n. R 43 Preferred hydrogen atoms, -OR 208 -SR 209 -NR 210 R 211 -NHC(=O)R216 -O (CH2CH2O) n R 218 -O(CH2CH2S) n R 219 -S(CH2CH2O) n R 220 -S (CH2CH2S) n R 221 Or a noncyclic hydrocarbon group (preferably a noncyclic alkyl group), more preferably a hydrogen atom, -OR 208 -SR 209 -NR 210 R 211 -NHC(=O)R 216 Or acyclic alkyl, more preferably -NHC(=O)R 216 Or acyclic alkyl. Here, R 208 ~R 211 R 216 R 218 ~R 221 Acyclic alkyl groups are preferred. In relation to R 44 and R 46 -NR located in the adjacent position 210 R 211 In the middle, R 210 Preferred acyclic alkyl group, R 211 Preferably acyclic alkyl, more preferably unsubstituted acyclic alkyl (including acyclic alkyl substituted with acyclic alkyl) or having -OR 208 Acyclic alkyl groups with monocyclic or fused polycyclic hydrocarbon groups as substituents. Here, R... 208 Hydrogen atoms or acyclic alkyl groups are preferred. Additionally, R in general formula (iv) 44 and / or R 46 It can be related to R on the benzene ring 44 and R 46 -NR located in the adjacent position 210 R 211 R in 210 and / or R 211 The rings are bonded together to form a ring. The rings that can be formed are preferably 5-membered or 6-membered rings, and can be saturated or unsaturated, but are preferably saturated 6-membered rings. The rings that can be formed may further have substituents, for example, preferably alkyl groups. Among them, R is preferred as the morphology for forming the ring. 46 With respect to R on the benzene ring 44 and R 46 -NR located in the adjacent position 210 R 211 R in 211They bond together to form a saturated 6-membered ring.

[0060] As specific examples of pigments represented by general formula (iv), in addition to the compounds used in the examples described below, compounds described in paragraph

[0053] of Japanese Patent Application Publication No. 2013-129712 may also be cited. However, the present invention is not limited to these.

[0061] (1-5) Indoleaniline dyes represented by the following general formula (v).

[0062] [Chemical Formula 5]

[0063] In the above formula, Q 1 It represents the set of atoms required to form a 5- to 7-membered nitrogen-containing heterocycle together with at least one nitrogen atom and bonded to a carbon atom. R 51 R represents acyl, alkoxycarbonyl, aryloxycarbonyl, aminocarbonyl, or sulfonyl groups. 52 R represents a hydrogen atom or an alkyl group. 53 ~R 57 R represents a hydrogen atom, alkyl group, alkoxy group, amide group, alkylsulfonylamino group, or halogen atom. 58 and R 59 It represents a hydrogen atom, alkyl group, or aryl group. R 51 With R 53 R 54 With R 55 and / or R 55 With R 59 Or R 58 With R 59 They can bond together to form a ring. That is, it refers to R. 51 With R 53 They can bond together to form a ring, R 54 With R 55 and / or R 55 With R 59 They can bond together to form a ring, or R 58 With R 59 They can bond together to form a ring.

[0064] Regarding the definitions and preferred ranges of each substituent in general formula (v), unless otherwise specified, the information described in Japanese Patent Application Publication No. 2-92686 can be compared with that of general formula (I) for R. 1 ~R 6 R 8 R 9 and Q 1 The relevant records apply directly to R. 51 ~R56 R 58 R 59 and Q 1 . Furthermore, in this invention, regarding R... 53 ~R 56 Except for R related to general formula (I) as recorded in Japanese Patent Application Publication No. 2-92686 3 ~R 6 In addition to hydrogen atoms, alkyl groups, alkoxy groups, and halogen atoms, the following amide groups and alkylsulfonyl amide groups may also be used. As R 53 ~R 57 The number of carbon atoms in the amide group that can be used is preferably 1 to 12, more preferably 1 to 6. As R 53 ~R 57 The number of carbon atoms in the alkyl sulfonyl amino group that can be used is preferably 1 to 12, more preferably 1 to 6. Regarding R 57 The alkyl, alkoxy, and halogen atoms that can be used can be directly applied as R 53 ~R 56 The description of alkyl, alkoxy and halogen atoms.

[0065] Q 1 Preferred from -NR 16 C(=O)-Q 2 - indicates. Q 2 Indicates -NR 16 C(=O)-Q 2 -The bonded carbon atoms and -NR 16 C(=O)- forms the atomic group required to form a 5- to 7-membered nitrogen-containing heterocycle. Examples include divalent amino groups, ether bonds, thioether bonds, alkylene bonds, vinyl bonds, imino bonds, sulfonyl bonds, carbonyl bonds, arylene bonds, or divalent heterocyclic groups, or groups composed of multiple of these. R 16 Represents a hydrogen atom, alkyl, aryl, or heterocyclic group, preferably a hydrogen atom. Regarding R... 16 The definitions and preferred ranges of each substituent can also be directly applied to the R described in Japanese Patent Application Publication No. 2-92686 and the general formula (I). 16 Relevant records. R 51 Preferably, the acyl group or the alkoxycarbonyl group has 2 to 7 carbon atoms. R 52 Preferred hydrogen atoms, R 53 ~R 56 Hydrogen atoms are preferred. R 57Preferably, it is alkoxy, amide, or alkylsulfonylamino, more preferably alkoxy or amide. R 58 and R 59 Alkyl groups with 1 to 6 carbon atoms are preferred.

[0066] The indole aniline pigment represented by the above general formula (v) is preferably represented by the following general formula (va).

[0067] [Chemical Formula 6]

[0068] In the above formula, R 51 R 53 R 57 ~R 59 and Q 2 R in the above general formula (v) 51 R 53 R 57 ~R 59 and Q 2 They have the same meaning. Q 2 Preferred - CR 11 R 12 CR 13 R 14 -、-CR 11 R 12 -or-NR 11 -, more preferably -CR 11 R 12 CR 13 R 14 - R 11 ~R 14 R represents an alkyl group having 1 to 4 hydrogen atoms or carbon atoms. 11 and R 12 It is a hydrogen atom and R 13 and R 14 It is an alkyl group having 1 to 4 carbon atoms. Additionally -CR 11 R 12 CR 13 R 14 -Preferred in R 11 and R 12 The bonded carbon atom is bonded to the >C=O side.

[0069] As specific examples of pigments represented by general formula (v), in addition to the compounds used in the examples described later, compounds No. 1 to 51 described on pages 5 to 6 of Japanese Patent Application Publication No. 2-92686 may also be cited. However, the present invention is not limited to these.

[0070] The total content of the dyes in the aforementioned light absorption fading layer is preferably 0.10% by mass or more, more preferably 0.15% by mass or more, even more preferably 0.20% by mass or more, particularly preferably 0.25% by mass or more, and particularly preferably 0.30% by mass or more. If the total content of the dyes in the aforementioned light absorption fading layer is at or above the aforementioned preferred lower limit, good light absorption properties, such as anti-reflection effects, can be obtained. Furthermore, the total content of the dyes in the light absorption fading layer is generally 50% by mass or less, preferably 40% by mass or less, more preferably 30% by mass or less, even more preferably 15% by mass or less, and particularly preferably 10% by mass or less. That is, the total content of the dyes in the light absorption disappearance layer is preferably 0.10 to 50% by mass, more preferably 0.15 to 40% by mass, even more preferably 0.20 to 30% by mass, particularly preferably 0.25 to 15% by mass, and particularly preferably 0.30 to 10% by mass.

[0071] The content of the azo pigment represented by the above general formula (i) in the light absorption fading layer is preferably 0.01 to 30% by mass, more preferably 0.1 to 10% by mass. The content of each pigment in the light absorption fading layer—the azo pigment represented by the above general formula (ii), the azo pigment represented by the above general formula (iii), the azo pigment represented by the above general formula (iv), and the indoleaniline pigment represented by the above general formula (v)—is also preferably 0.01 to 30% by mass, more preferably 0.1 to 10% by mass, similar to the content of the azo pigment represented by the above general formula (i). Furthermore, in the light absorption fading layer, all of the dyes may be composed of at least one of the azo pigments represented by any one of the above general formulas (i) to (iv) and the indoleaniline pigment represented by the above general formula (v).

[0072] <Compounds that generate free radicals through ultraviolet irradiation> The aforementioned light-absorbing and disappearing layer contains a compound that generates free radicals upon ultraviolet irradiation (in this invention, it is also simply referred to as a "free radical generator"). The aforementioned free radical generators are compounds that generate free radicals by ultraviolet irradiation, and are not particularly limited as long as they are compounds that have the function of decolorizing the aforementioned dyes. For example, a photoradioactive free radical generator that can be used in conjunction with compound B described later can be used as a free radical generator.

[0073] The aforementioned free radical generator can preferably be a combination of two or more compounds, where the free radicals are generated by ultraviolet irradiation as a result of interactions such as complex formation between the two or more compounds in the aforementioned light absorption disappearance layer. Regarding the types of compounds used in the combination, in the mechanism of generating free radicals by ultraviolet irradiation, it is sufficient to use two or more compounds exhibiting different functions, preferably two. As such a combination, a combination of compound A having an acid group and compound B having a structure capable of forming hydrogen bonds with the acid group contained in compound A is preferably provided. When the aforementioned light-absorbing fading layer contains compound A, which has an acid group, and compound B, which has a structure capable of forming hydrogen bonds with the acid group contained in compound A, the efficiency of generating free radicals by ultraviolet irradiation is improved compared to the case where the aforementioned photoradical generator is used. Therefore, even under mild temperature conditions such as room temperature, sufficient free radicals are generated to react directly or indirectly with the aforementioned dye, decomposing the dye and thereby causing the dye to fade or decolorize. In particular, the azo dye represented by any one of the aforementioned general formulas (i) to (iv), the indoleaniline dye represented by the aforementioned general formula (v), and the squaric acid cyanine dye represented by the following general formula (1) contained in the aforementioned light-absorbing fading layer hardly undergo secondary absorption accompanying the decomposition of the dye, thus preventing decolorization. The following describes in detail compound A, which has an acid group, and compound B, which has a structure capable of forming hydrogen bonds with the aforementioned acid group contained in compound A.

[0074] (1) Compound A with an acid group The aforementioned light-absorbing efflorescence layer preferably contains a compound A (also referred to as "compound A" in this invention) having an acid group as the aforementioned free radical generator, and contains a compound B having a structure capable of forming hydrogen bonds with the acid group contained in compound A described later. As for the acid group contained in compound A, it is preferable to have a proton-dissociable group with a pKa of 12 or less. Specifically, examples of acid groups include carboxyl groups, sulfonamide groups, phosphonic acid groups (-P(=O)(OH)2), phosphate groups (-OP(=O)(OH)2), sulfonyl groups, phenolic hydroxyl groups, and sulfonamide groups, with carboxyl groups being preferred. In addition, pKa refers to the negative common logarithm (-logKa) of the acid dissociation constant (Ka) in water at 25°C. In the pKa of compound B described later, the mixed solvent of water / methanol = 50 / 50 (volume ratio) is changed to water, but otherwise, it can be calculated in the same way. Compound A can be a low-molecular-weight compound or a high-molecular-weight compound (hereinafter also referred to as "polymer"), preferably a polymer. Compound A being a polymer means that compound A is chemically bonded to the polymer containing the resin constituting the light absorption disappearance layer. When compound A is a low-molecular-weight compound, its molecular weight is less than 5000, preferably less than 2000, more preferably less than 1000, further preferably less than 500, and particularly preferably less than 400. There is no particular limitation on the lower limit, but it is practically 100 or more, preferably 200 or more. That is, it is practically 100 or more and less than 5000, preferably 200 to 2000, more preferably 200 to 1000, further preferably 200 to 500, and particularly preferably 200 to 400. When compound A is a polymer, the lower limit of the weight-average molecular weight of compound A is 5,000 or more, and from the viewpoint of the physical properties of the filter, it is preferably 10,000 or more, more preferably 15,000 or more. The upper limit is not particularly limited, but from the viewpoint of solubility in solvents, it is preferably 500,000 or less, more preferably 200,000 or less, and even more preferably 150,000 or less. That is, practically it is 5,000 to 500,000, more preferably 10,000 to 200,000, and even more preferably 15,000 to 150,000.

[0075] Furthermore, some or all of the acid groups contained in compound A may be anionized or not anionized in the light absorption vanishing layer constituting the light absorption filter. In this invention, both anionized and non-anionized acid groups are included and referred to as acid groups. That is, compound A may be anionized or not anionized in the light absorption vanishing layer constituting the light absorption filter.

[0076] From the viewpoint of excellent film-forming properties of light-absorbing and disappearing layers, compound A is preferably a compound having a carboxyl group. As the aforementioned compounds containing carboxyl groups, preferably are monomers containing carboxyl groups (hereinafter also referred to as "carboxyl-containing monomers") or polymers containing carboxyl groups (hereinafter also referred to as "carboxyl-containing polymers"). From the viewpoint of film-forming properties of light absorption fading layers, polymers containing carboxyl groups are more preferred.

[0077] Furthermore, some or all of the carboxyl groups (-COOH) in carboxyl-containing monomers and polymers can be anionized or not anionized in optical absorption filters. The anionized carboxyl groups (-COOH)... - Both non-anionic carboxyl groups are included and referred to as carboxyl groups. That is, carboxyl-containing polymers can be anionized or non-anionized in the light absorption disappearance layer that constitutes the light absorption filter. Both anionized and non-anionized carboxyl-containing polymers are included and referred to as carboxyl-containing polymers.

[0078] The content of compound A in the aforementioned light absorption fading layer is preferably 1% by mass or more, more preferably 25% by mass or more, even more preferably 30% by mass or more, particularly preferably 45% by mass or more, and especially preferably 50% by mass or more. The upper limit of the content of compound A is preferably less than 100% by mass, more preferably less than 99% by mass, and even more preferably less than 97% by mass. That is, it is preferably 1% by mass or more and less than 100% by mass, more preferably 25% to 99% by mass, even more preferably 30% to 97% by mass, especially preferably 45% to 97% by mass, and especially preferably 50% to 97% by mass. Wherein, when compound A is a polymer, the content of compound A in the light absorption disappearance layer is preferably 50% by mass or more and less than 100% by mass, more preferably 60% by mass or more and less than 100% by mass, and even more preferably 70% by mass or more and less than 100% by mass. The upper limit is also preferably 99% by mass or less, more preferably 97% by mass or less, even more preferably 95% by mass or less, and particularly preferably 90% by mass or less. Compound A can be used alone or in combination with two or more compounds.

[0079] (Monomers containing carboxyl groups) Examples of monomers containing carboxyl groups include polymeric compounds that contain carboxyl groups and one or more (e.g., 1 to 15) olefinic unsaturated groups. Examples of olefinic unsaturated groups include (meth)acryloyl, vinyl, and styryl, with (meth)acryloyl being preferred. In addition, when the olefinic unsaturated group is (meth)acryloyl, the carbonyl bond in (meth)acryloyl can share one carbonyl bond with the carbonyl bond in the carboxyl group. From the viewpoint of superior film-forming properties, monomers with two or more functions containing carboxyl groups are preferred as monomers containing carboxyl groups. Furthermore, monomers with two or more functions refer to polymeric compounds having two or more (e.g., 2 to 15) olefinic unsaturated groups in one molecule. The number of carboxyl groups contained in the monomer is only one or more, for example, preferably 1 to 8, more preferably 1 to 4, and even more preferably 1 to 2. Monomers containing a carboxyl group may further have an acid group other than a carboxyl group as an acid group. Examples of acid groups other than a carboxyl group include phenolic hydroxyl groups, phosphate groups, and sulfonic acid groups.

[0080] Monomers with two or more functions containing a carboxyl group are not particularly restricted and can be appropriately selected from known compounds. As monomers containing carboxyl groups and having two or more functions, examples include, for instance, ARONIX M-520 and ARONIX M-510 (both manufactured by TOAGOSEI CO., LTD.).

[0081] Furthermore, examples of monomers with three or more functions containing carboxyl groups include polymeric compounds with three to four functions (compounds that introduce carboxyl groups into the backbone of pentaerythritol triacrylate and pentaerythritol tetraacrylate [PETA] (acid value = 80 to 120 mg KOH / g)) and polymeric compounds with five to six functions containing carboxyl groups (compounds that introduce carboxyl groups into the backbone of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate [DPHA] (acid value = 25 to 70 mg KOH / g)). Additionally, when using monomers with three or more functions containing carboxyl groups, from the viewpoint of superior film-forming properties, monomers with two or more functions containing carboxyl groups are also preferred.

[0082] Examples of monomers with two or more functions containing a carboxyl group or a difunctional monomer containing an acid group include polymeric compounds with acid groups described in paragraphs 0025 to 0030 of Japanese Patent Application Publication No. 2004-239942. The contents of that publication are incorporated herein by reference.

[0083] (Carboxyl-containing polymers) Polymers containing carboxyl groups may further have acid groups other than carboxyl groups as acid groups. Examples of acid groups other than carboxyl groups include phenolic hydroxyl groups, phosphate groups, and sulfonic acid groups. When the carboxyl-containing polymer is a copolymer, the polymer structure can be a random polymer or a regular polymer such as a block polymer.

[0084] <<Structural units with carboxyl groups>> Polymers containing carboxyl groups preferably contain structural units with carboxyl groups. Examples of structural units containing a carboxyl group include those derived from (meth)acrylic acid, crotonic acid, itaconic acid, maleic acid, or fumaric acid. Among these, structural units derived from (meth)acrylic acid are preferred from the viewpoint of excellent decolorizing properties of the dye.

[0085] In a carboxyl-containing polymer, when the total of all structural units of the carboxyl-containing polymer is set to 100 mol%, the content of structural units with carboxyl groups is preferably 1 to 100 mol%, more preferably 3 to 65 mol%, further preferably 5 to 60 mol%, particularly preferably 10 to 60 mol%, wherein, preferably 20 to 55 mol%. Structural units with carboxyl groups can be used alone or in combination with two or more.

[0086] <<Structural units with aromatic rings>> In addition to the structural units described above, polymers containing carboxyl groups preferably also contain structural units having an aromatic ring (preferably an aromatic hydrocarbon ring). For example, structural units derived from (meth)acrylates (specifically, benzyl (meth)acrylate, phenethyl (meth)acrylate, or phenoxyethyl (meth)acrylate, etc.) with aromatic rings can be cited.

[0087] When the total of all structural units of the carboxyl-containing polymer is set to 100 mol%, the content of the structural units with aromatic rings in the carboxyl-containing polymer is preferably 0 to 97 mol%, more preferably 0 to 95 mol%, and even more preferably 0 to 90 mol. Aromatic ring structural units can be used alone or in combination with two or more.

[0088] <<Structural Units with Alicyclic Structures>> In addition to the structural units mentioned above, polymers containing carboxyl groups preferably also contain structural units with alicyclic structures. As an alicyclic structure, for example, a tricyclic [5.2.1.0] can be cited. 2,6 Decane ring structure (also known as tetrahydrodicyclopentadiene. The monovalent group is dicyclopentyl), tricyclic [5.2.1.0] 2,6 Decane-3-enyl ring structure (also known as 5,6-dihydrodicyclopentadiene, with a dicyclopentenyl monovalent group), isobornane ring structure (with an isobornyl monovalent group), adamantane ring structure (with an adamantyl monovalent group), and cyclohexane ring structure (with a cyclohexyl monovalent group). As structural units with an alicyclic structure, examples include structural units derived from (meth)acrylates (specifically, dicyclopentyl (meth)acrylate, dicyclopentenyl (meth)acrylate, isobornyl (meth)acrylate, adamantyl (meth)acrylate, methyl adamantyl (meth)acrylate, or cyclohexyl (meth)acrylate, etc.).

[0089] When the total of all structural units of the carboxyl-containing polymer is set to 100 mol%, the content of structural units with alicyclic structures in the carboxyl-containing polymer is preferably 0-97 mol%, more preferably 0-95 mol%, and even more preferably 0-90 mol%. Structural units with alicyclic structures can be used alone or in combination with two or more types.

[0090] <<Other Structural Units>> Polymers containing carboxyl groups may have other structural units besides those mentioned above. Other structural units mentioned above include, for example, structural units derived from (meth)acrylate. When the total of all structural units of the carboxyl-containing polymer is set to 100 mol%, the content of other structural units in the carboxyl-containing polymer is preferably 0-70 mol%, more preferably 0-50 mol%, and even more preferably 0-20 mol%. Other structural units can be used individually or in combination with two or more.

[0091] (2) Compound B The aforementioned light-absorbing efflorescence layer preferably contains the aforementioned compound A and compound B (also referred to as "compound B" in this invention) which has a structure capable of forming hydrogen bonds with the aforementioned acid groups contained in compound A as the aforementioned free radical generator. As compound B, it is preferable to have a structure that increases basicity by absorbing ultraviolet light and becoming excited. By increasing the basicity of compound B in the excited state, a complex can be formed in which the acid group contained in compound A interacts more strongly with compound B, thereby improving the efficiency of free radical generation. The structure of compound B that can form hydrogen bonds with the acid groups contained in compound A can be the overall structure of compound B or a partial structure that constitutes a part of compound B. Compound B can be a high molecular weight compound (a compound with a molecular weight of 5000 or more) or a low molecular weight compound (a compound with a molecular weight of less than 5000), with a low molecular weight compound being preferred. The molecular weight of compound B, as a low-molecular-weight compound, is less than 5000, preferably less than 1000, more preferably less than 500, and even more preferably less than 350. There is no particular limitation on the lower limit, but 65 or more is preferred, more preferably 75 or more. A preferred range for the molecular weight of compound B, as a low-molecular-weight compound, is, for example, 65 or more and less than 5000, preferably 65 or more and less than 1000, more preferably 65 to 500, and even more preferably 75 to 350.

[0092] From the perspective of having a large molar absorptivity relative to ultraviolet light, compound B is preferably an aromatic compound. Here, aromatic compounds refer to compounds having one or more aromatic rings. The aromatic ring described above may be present in compound B in a single form or in multiple forms. In the case of multiple forms, for example, the aromatic ring may be present in the side chains of the polymer constituting the resin. The aforementioned aromatic ring can be any of an aromatic hydrocarbon ring or an aromatic heterocycle. In the case of an aromatic heterocycle (also called a heteroaromatic ring), it is a compound having one or more (e.g., 1 to 4) heteroatoms (at least one of nitrogen, oxygen, or sulfur atoms, etc.) as ring member atoms (ring constituent atoms), preferably having one or more (e.g., 1 to 4) nitrogen atoms as ring member atoms. Furthermore, unsubstituted aromatic hydrocarbons do not possess a structure capable of forming hydrogen bonds with the aforementioned acid groups in compound A, and therefore do not possess the function of generating free radicals through ultraviolet irradiation, and thus do not belong to compound B. Moreover, unsubstituted aromatic hydrocarbon rings in the form where they are bonded to the side chains of the polymer constituting the resin do not possess a structure capable of forming hydrogen bonds with the aforementioned acid groups in compound A, and therefore do not possess the function of generating free radicals through ultraviolet irradiation, and thus do not belong to compound B. The number of ring members in the above-mentioned aromatic ring is preferably 5 to 15.

[0093] Examples of aromatic rings include monocyclic aromatic rings such as pyridine rings, pyrazine rings, pyrimidine rings, and triazine rings; aromatic rings composed of two fused rings such as quinoline rings, isoquinoline rings, quinoxaline rings, and quinazoline rings; and aromatic rings composed of three fused rings such as acridine rings, phenanthridine rings, phenanthreneline rings, and phenazine rings.

[0094] The aromatic ring described above may have one or more substituents (e.g., 1 to 5), and examples of such substituents include alkyl, aryl, halogen, acyl, alkoxycarbonyl, arylcarbonyl, carbamoyl, hydroxyl, cyano, and nitro groups. Furthermore, when the aromatic ring has two or more substituents, the multiple substituents may bond together to form a non-aromatic ring. In addition, when multiple aromatic rings (e.g., 2 to 5 aromatic rings) form a series of aromatic ring structures bonded by structures selected from single bonds, carbonyl bonds, and multiple bonds (e.g., vinylenes that may have substituents, -C≡C-, -N=N-, etc.), the entire series of aromatic ring structures is regarded as a single specific structure. The aforementioned aromatic rings are bonded by a series of aromatic ring structures selected from single bonds, carbonyl bonds, and multiple bonds. These aromatic ring structures do not belong to the aforementioned unsubstituted aromatic hydrocarbon rings, nor do they belong to the unsubstituted aromatic hydrocarbon rings in the form of unsubstituted aromatic hydrocarbon rings bonded to the side chains of the polymer constituting the resin. Furthermore, preferably, one or more of the aromatic rings constituting the above-mentioned series of aromatic ring structures are the above-mentioned heteroaromatic rings.

[0095] Specific examples of compound B include monocyclic aromatic compounds such as pyridine compounds (pyridine and pyridine derivatives), pyrazine compounds (pyrazine and pyrazine derivatives), pyrimidine compounds (pyrimidine and pyrimidine derivatives), and triazine compounds (triazine and triazine derivatives); compounds in which two rings are fused to form an aromatic ring, such as quinoline compounds (quinoline and quinoline derivatives), isoquinoline compounds (isoquinoline and isoquinoline derivatives), quinoxaline compounds (quinoxaline and quinoxaline derivatives), and quinazoline compounds (quinazoline and quinazoline derivatives); and compounds in which three or more rings are fused to form an aromatic ring, such as acridine compounds (acrididine and acridine derivatives), phenanthridine compounds (phenanthridine and phenanthridine derivatives), phenanthroxaline compounds (phenanthroxaline and phenanthroxaline derivatives), and phenazine compounds (phenazine and phenazine derivatives). In specific examples of these compounds B, the term "compound" is used in the sense of including, in addition to the compound itself, unsubstituted compounds with altered structures, and compounds having substituents (referred to as "derivatives"), without impairing the effects of the invention. It is inferred that these compounds B form a complex with the aforementioned compound A, and generate a free radical of 2 molecules through the following mechanism by ultraviolet irradiation. 1) Compound B is generated in an excited state by absorbing ultraviolet light. 2) Holes move from the excited state of compound B to the ground state of compound A (electrons from compound A move to the lower energy side of the two half-occupied orbitals of the excited state of compound B). 3) By moving protons from compound A to compound B, free radicals loaded with hydrogen radicals are generated on compound B, and free radicals from which hydrogen radicals are released from compound A are generated. When compound A is a compound with a carboxyl group, the following reaction is further initiated, generating free radicals through photodecarboxylation. 4) The free radicals after the removal of hydrogen free radicals from compound A are further removed by carbon dioxide.

[0096] Wherein, compound B is preferably one or more of quinoline compounds (quinoline and quinoline derivatives) and isoquinoline compounds (isoquinoline and isoquinoline derivatives). As substituents that may be present in these compounds, alkyl, aryl, halogen atom, acyl, alkoxycarbonyl, arylcarbonyl, carbamoyl, hydroxyl, cyano or nitro are preferred.

[0097] When compound B is a polymer, it can be a polymer in which the above-mentioned specific structure is bonded to the polymer backbone via single bonds or linking groups. Compound B, as a polymer, is obtained, for example, by polymerizing monomers having heteroaromatic rings (specifically, heteroaromatic rings having vinyl groups and / or (meth)acrylate monomers having heteroaromatic rings). It can be copolymerized with other monomers as needed.

[0098] Specific examples of compound B include, for instance, quinoline, 2-methylquinoline, 4-methylquinoline, 2,4-dimethylquinoline, 2-methyl-4-phenylquinoline, isoquinoline, 1-methylisoquinoline, 3-methylisoquinoline, and 1-phenylisoquinoline.

[0099] From the viewpoint of balancing the decolorization of the ultraviolet-irradiated part and the durability of the dye in the ultraviolet-unirradiated part, the content of compound B is preferably 0.1 to 50% by mass, more preferably 2.0 to 40% by mass, even more preferably 4 to 35% by mass, and particularly preferably 8 to 30% by mass, relative to the total mass of the light absorption fading layer. Furthermore, from the viewpoint of balancing the decolorization of the UV-irradiated portion and the durability of the dye in the UV-unirradiated portion, the basicity of compound B, i.e., pKaH (pKa of the conjugate acid), is preferably 2.0 to 7.0, more preferably 3.0 to 6.0, and even more preferably 4.3 to 5.5. In this invention, pKa refers to the negative common logarithm (-logKa) of the acid dissociation constant (Ka) in a mixed solvent of water / methanol = 50 / 50 (volume ratio) at 25°C. pKa can be calculated by adding 0.01 mol / L of sodium hydroxide aqueous solution to a mixed solution of water / methanol = 50 / 50 (volume ratio) of the sample to be tested (the conjugate acid of compound B), and reading the amount of sodium hydroxide aqueous solution added up to the half-equivalent point. Compound B can be used alone or in combination with two or more compounds.

[0100] <Resin> The resin contained in the aforementioned light absorption fading layer is not particularly limited as long as it can disperse (preferably dissolve) the dye, exhibit the fading effect of the dye caused by free radicals generated from compounds that generate free radicals by ultraviolet irradiation (preferably containing a free radical generator of compound B that bonds to the acid group contained in compound A), and has the desired light transmittance (preferably 80% or more in the visible region of wavelengths from 400 to 800 nm).

[0101] Various polymers can be used as the polymer constituting the above-mentioned resin. However, from the viewpoint that it is difficult for the molecular weight of the resin to decrease due to ultraviolet irradiation, polymers having aromatic rings or alicyclic structures in the side chains are preferred, and (meth)acrylic acid polymers containing structural units having aromatic rings or alicyclic structures are more preferred. Among these, from the viewpoint that it is possible to further improve the decolorization rate, and also to further improve the heat resistance and light resistance, (meth)acrylic acid polymers containing structural units having alicyclic structures are even more preferred. Here, a (meth)acrylic acid polymer refers to a polymer containing at least one of structural units derived from (meth)acrylic acid and structural units derived from (meth)acrylate. Furthermore, when a polymer contains structural units derived from (meth)acrylic acid, these structural units become structural units having a carboxyl group as an acid group in the aforementioned compound A. A polymer containing structural units derived from (meth)acrylic acid is equivalent to the polymer described above in which the aforementioned compound A is chemically bonded to the polymer constituting the resin. Furthermore, in this invention, "main chain" refers to the longest connecting chain in the molecule of a polymer compound, and "side chain" refers to a group of atoms that branch off from the main chain.

[0102] Examples of monomers providing structural units having aromatic rings include benzyl acrylate, benzyl methacrylate, naphthyl acrylate, naphthyl methacrylate, methyl naphthyl acrylate, and methyl naphthyl methacrylate. When the polymer does not contain structural units derived from (meth)acrylic acid, the content of structural units having aromatic rings relative to the total mass of the polymer is preferably 5 to 100% by mass, more preferably 10 to 100% by mass, and even more preferably 20 to 100% by mass.

[0103] Examples of monomers that provide structural units with alicyclic structures include dicyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, and adamantyl (meth)acrylate. When the above polymer contains structural units with alicyclic structures, the content of structural units with alicyclic structures is preferably 1 to 90% by mass relative to the total mass of the polymer, more preferably 5 to 90% by mass, and even more preferably 5 to 80% by mass.

[0104] Furthermore, in the aforementioned light absorption fading layer, the polymer constituting the resin may contain structural units bonded to compound A, which has an acid group. As the structural unit bonded to compound A, the description relating to the carboxyl-containing structural unit in compound A is applicable, preferably a structural unit derived from (meth)acrylic acid. The content of the structural unit bonded to compound A (preferably a structural unit derived from (meth)acrylic acid) relative to the total mass of the polymer is preferably 1 to 70% by mass, more preferably 1 to 60% by mass. It is further preferable to apply the description of the content of carboxyl-containing structural units in the carboxyl-containing polymer of compound A. When the polymer constituting the above-mentioned resin contains structural units bonded to compound A having an acid group, the contents of the structural units bonded to compound A having an acid group, the contents of the structural units having an aromatic ring, and the contents of the structural units having an alicyclic structure shall be described in relation to the contents of the structural units having a carboxyl group, the contents of the structural units having an aromatic ring, and the contents of the structural units having an alicyclic structure in the carboxyl-containing polymer of the above-mentioned compound A.

[0105] From the viewpoint of regulating the glass transition temperature, the polymer constituting the above-mentioned resin may contain alkyl structural units having 1 to 14 carbon atoms. Examples of alkyl structural units having 1 to 14 carbon atoms include structural units derived from alkyl methacrylates such as methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, tert-butyl methacrylate, sec-butyl methacrylate, amyl methacrylate, 2-ethylhexyl methacrylate, 2-ethylbutyl methacrylate, n-octyl methacrylate, isooctyl methacrylate, isononyl methacrylate, lauryl methacrylate, and tetradecyl methacrylate. In this invention, alkyl structural units having 1 to 14 carbon atoms may be used alone, or two or more may be used in combination. The content of alkyl structural units having 1 to 14 carbon atoms is preferably 0 to 95% by mass relative to the total mass of the polymer constituting the resin.

[0106] The weight-average molecular weight (Mw) of the polymer constituting the above-mentioned resin is preferably 10,000 or more, more preferably 10,000 to 200,000, and even more preferably 15,000 to 150,000.

[0107] Next, the wavelength-selective absorption layer constituting the optical absorption filter of the present invention will be described in detail.

[0108] <<Wavelength Selective Absorption Layer>> The wavelength selective absorption layer constituting the optical absorption filter of the present invention contains a resin and a dye having a main absorption wavelength band in the wavelength range of 400 to 700 nm, and does not contain compounds that generate free radicals by ultraviolet irradiation. In the wavelength-selective absorption layer described above, the dye is dispersed (preferably dissolved) in the resin, thereby making the wavelength-selective absorption layer a layer that displays a specific absorption spectrum originating from the dye.

[0109] <Dyes> The "dye" contained in the wavelength selective absorption layer is preferably one of the following dyes A to D that have a main absorption wavelength band in different wavelength regions. Dye A: A dye with a main absorption wavelength band in the wavelength range of 390–435 nm. Dye B: A dye with a main absorption wavelength band in the wavelength range of 480–520 nm. Dye C: A dye with a main absorption wavelength band in the wavelength range of 560–610 nm. Dye D: A dye with a main absorption wavelength band in the wavelength range of 640–780 nm. Furthermore, the wavelength-selective absorption layer may contain one or more dyes A. Similarly, the wavelength-selective absorption layer may contain one or more dyes B through D. The wavelength-selective absorption layer described above can also contain dyes other than dyes A to D.

[0110] The morphology of the wavelength-selective absorption layer described above is sufficient as long as the dye in the wavelength-selective absorption layer displays an absorption spectrum, and the combination with the light absorption disappearance layer described above can achieve both suppression of external light reflection and suppression of brightness reduction in the obtained filter. Preferably, it is even less likely to affect the original color tone of the displayed image. As one morphology of the wavelength-selective absorption layer described above, a morphology in which the dye (preferably at least one of dyes A to D) is dispersed (preferably dissolved) in the resin can be cited. This dispersion can be random, regular, or any other type.

[0111] In the wavelength-selective absorption layer described above, dyes A through D have main absorption wavelength bands in the wavelength regions of 390–435 nm, 480–520 nm, 560–610 nm, and 640–780 nm, respectively. These wavelength regions almost do not overlap with the light-emitting light sources B (Blue, 460 nm), G (Green, 520 nm), and R (Red, 620 nm) used in OLED display devices. Therefore, by containing at least one of these dyes A through D, the wavelength-selective absorption layer can suppress the reflection of external light in the display section of the display device without impairing the color reproduction area of ​​the light emitted from the OLED. Furthermore, when the filter obtained by using the light absorption filter of the present invention is applied to an inorganic EL display device or a liquid crystal display device, similarly to an OLED display device, by containing a dye in the wavelength selective absorption layer that has a main absorption wavelength band in a wavelength region that hardly overlaps with the light source of each display device, the reflection of external light in the display section of the display device can be suppressed without impairing the color reproduction area of ​​the light emitted from each display device.

[0112] In particular, as a wavelength-selective absorption layer that displays an absorption spectrum that has a negative correlation with the emission spectrum of the light source, from the viewpoint of bringing out the original color tone of the image of the OLED display device, the wavelength-selective absorption layer contains dyes A, B, C and D, preferably a combination of at least two, more preferably a combination of at least three, and even more preferably all four. As described above, when the wavelength-selective absorption layer contains two or more dyes A to D, the lightfastness can sometimes decrease due to chain transfer of free radicals generated during dye decomposition. To address this issue, the wavelength-selective absorption layer in the optical absorption filter of the present invention and the filter obtained by mask exposure of the optical absorption filter of the present invention can exhibit excellent lightfastness exceeding the decrease in lightfastness caused by dye mixing, thanks to the provision of the specific barrier layer described later.

[0113] From the viewpoint of better preserving the original color tone of the image in the OLED display device, the wavelength selective absorption layer preferably contains all of the aforementioned four dyes A to D, and satisfies the following relationships (I) to (VI). The filter of the present invention, obtained by the light absorption filter of the present invention having a wavelength selective absorption layer with this structure and having the aforementioned light absorption vanishing layer, can not only sufficiently suppress external light reflection and suppress brightness reduction, but also maintain the original color tone of the image in the OLED display device at a superior level. Relation (I) Ab(450) / Ab(430) < 1.0 Relation (II) Ab(450) / Ab(500) < 1.0 Relation (III) Ab(540) / Ab(500) < 1.0 The relation (IV) Ab(540) / Ab(600) < 1.0 The relation (V) Ab(630) / Ab(600) ≤ 0.5 Relationship (VI) Ab(630) / Ab(700) < 1.0

[0114] Within the range defined by the above relations (I) to (VI), the preferred range is as follows. The upper limit of Ab(450) / Ab(430) in relation (I) is preferably 0.90 or less, more preferably 0.85 or less, even more preferably 0.80 or less, and particularly preferably 0.60 or less. There is no particular restriction on the lower limit, but it is actually 0.05 or more, preferably 0.10 or more, and more preferably 0.20 or more. The upper limit of Ab(450) / Ab(500) in relation (II) is preferably 0.90 or less, more preferably 0.80 or less, further preferably 0.75 or less, particularly preferably 0.65 or less, especially preferably 0.60 or less, and most preferably 0.50 or less. There is no particular limitation on the lower limit, but it is practically 0.05 or more, preferably 0.10 or more, and more preferably 0.20 or more. The upper limit of Ab(540) / Ab(500) in relation (III) is preferably 0.90 or less, more preferably 0.80 or less, further preferably 0.75 or less, particularly preferably 0.70 or less, and most preferably 0.50 or less, and most preferably 0.20 or less. There is no particular limitation on the lower limit, but in practice it is 0.01 or more, preferably 0.02 or more, and more preferably 0.05 or more. The upper limit of Ab(540) / Ab(600) in relation (IV) is preferably 0.90 or less, more preferably 0.85 or less, even more preferably 0.80 or less, particularly preferably 0.70 or less, and most preferably 0.50 or less, and most preferably 0.25 or less. There is no particular limitation on the lower limit, but in practice it is 0.01 or more, preferably 0.02 or more, and more preferably 0.05 or more. The upper limit of Ab(630) / Ab(600) in the relation (V) is preferably 0.40 or less, more preferably 0.30 or less, even more preferably 0.20 or less, and particularly preferably 0.15 or less. There is no particular restriction on the lower limit, but it is actually 0.01 or more, preferably 0.02 or more, and more preferably 0.05 or more. The upper limit of Ab(630) / Ab(700) in relation (VI) is preferably 0.95 or less, more preferably 0.90 or less, even more preferably 0.80 or less, and particularly preferably 0.75 or less. There is no particular restriction on the lower limit, but it is actually 0.01 or more, preferably 0.03 or more, more preferably 0.10 or more, even more preferably 0.40 or more, and particularly preferably 0.50 or more.

[0115] Equations (I) to (VI) satisfy the aforementioned preferred ranges, thereby reducing tone variations caused by the filter of the present invention and further enhancing the original tone of the image in the OLED display device. Therefore, dyes A to D preferably have sharp absorption waveforms in their main absorption wavelength bands. For example, when dye B is squaric acid cyanine pigment represented by general formula (1) described later, the above-mentioned wavelength-selective absorption layer relationships (II) and (III) can satisfy the above-mentioned preferred range, and can maintain the original color tone of the image of the OLED display device at a better level. This is believed to be because the green visual material of human cone cells has low absorbance at wavelengths near maximum absorption (534 nm). Furthermore, when dye C is squaric acid cyanine pigment represented by the general formula (1) described later, the above-mentioned wavelength-selective absorption layer relationships (I) to (IV) can satisfy the above-mentioned preferred range, and can maintain the original color tone of the image of the OLED display device at a better level. Similarly, it is believed that this is because the green visual material of human cone cells has low absorbance at wavelengths near the maximum absorption (534 nm). In particular, it is important that the relation (V) is satisfied without affecting the original color tone of the image on the OLED display device. It is believed that the relation (V) can suppress a The changes resulted in the ability to maintain the aforementioned hue at an excellent level.

[0116] (Dye A) Dye A is not particularly limited as long as it has a main absorption wavelength band in the wavelength range of 390 to 435 nm in the optical absorption filter of the present invention, and various dyes can be used. In addition, the wavelength range of the main absorption wavelength band of dye D is preferably 395-435 nm, more preferably 400-435 nm, and even more preferably 405-435 nm.

[0117] From the viewpoint that the absorption waveform in the main absorption wavelength band is sharp, the dye A described above is preferably represented by the following general formula (A1).

[0118] [Chemical Formula 7]

[0119] In formula (A1), R1 and R 2 Each can be independently represented as alkyl or aryl, R 3 ~R 6 Each independently represents a hydrogen atom or a substituent, R 5 With R 6 They can bond together to form a 6-membered ring.

[0120] Regarding the definitions and preferred ranges of each substituent in general formula (A1), unless otherwise specified, the descriptions relating to each substituent of the pigment represented by general formula (A1) as described in paragraphs

[0022] to

[0056] of International Publication No. 2022 / 138925 can be directly applied. For example, as described in paragraph

[0056] of International Publication No. 2022 / 138925, particularly from the viewpoint of lightfastness, R in general formula (A1) 1 and R 2 Among them, R is preferred. 1 It is an alkyl group, more preferably R. 1 It is an alkyl group and R 2 It is alkyl or aryl. Furthermore, from the same point of view, R is further preferred. 1 and R 2 Each of them is an alkyl group, and is particularly preferred to be an alkyl group having 1 to 8 carbon atoms.

[0121] Furthermore, from the viewpoint of heat resistance and lightfastness, R in the general formula (A1) is preferred. 1 and R 2 All are aryl. In R 1 and R 2 When each aryl group is represented independently, R is preferred. 3 R 5 and R 6 Each independently represents a hydrogen atom, alkyl group, or aryl group, and R 3 and R 6 At least one of them is a hydrogen atom. From the viewpoint of heat resistance and lightfastness, R is more preferred. 3 R represents a hydrogen atom. 5 and R 6 In cases where each is independently represented by an alkyl or aryl group, R is further preferred. 3 R represents a hydrogen atom. 5 and R 6 When each alkyl group is represented independently, R is particularly preferred. 3 R represents a hydrogen atom. 5 and R 6 Each independently represents an alkyl group, and R 5 and R 6The pigments bond to each other to form a ring and fuse with the pyrrole ring to form an indole ring together with the pyrrole ring. That is, the pigment represented by the above general formula (A1) is particularly preferred to be the pigment represented by the following general formula (A2).

[0122] [Chemical Formula 8]

[0123] In equation (A2), R 1 ~R 4 The meanings are respectively related to R in the general formula (A1) 1 ~R 4 The meanings are the same, and the preferred methods are also the same.

[0124] In equation (A2), R 15 Indicates a substituent. As can be used as R 15 The substituents can be exemplified by those contained in substituent group A of the description relating to the pigment represented by general formula (A1) as described in International Publication No. 2022 / 138925. As R 15 Preferably, it is an alkyl, aryl, halogen atom, acyl or alkoxycarbonyl group. Can be used as R 15 The meanings of alkyl and aryl groups are respectively related to their use as R. 3 R 5 and R 6 The meanings of alkyl and aryl groups are the same, and their preferred methods are also the same. As can be used as R 15 Halogen atoms, for example, chlorine, bromine and iodine atoms. As can be used as R 15 Acyl groups, for example, acetyl, propionyl and butyryl. As can be used as R 15 The amino group is suitable for R 4 The substituted aryl group may contain an amino group. Furthermore, it is also preferred that the alkyl group on the nitrogen atom of the amino group is bonded to form a cyclic, 5- to 7-membered nitrogen-containing heterocyclic group. As can be used as R 15 The alkoxycarbonyl group is preferably an alkoxycarbonyl group with 2 to 5 carbon atoms, for example, methoxycarbonyl, ethoxycarbonyl, n-propoxycarbonyl and isopropoxycarbonyl.

[0125] n is an integer from 0 to 4. n is not particularly restricted; for example, 0 or 1 is preferred.

[0126] Specific examples of pigments represented by the general formula (A1) include the compounds described in International Publication Nos. 2022 / 138925

[0063] to

[0065] and the following compound (E-42). However, the present invention is not limited to these.

[0127] [Chemical Formula 9]

[0128] As dye A, in addition to pigments represented by the general formula (A1), compounds described in paragraphs 0012 to 0067 of Japanese Patent Application Publication No. 5-53241 and compounds described in paragraphs 0011 to 0076 of Japanese Patent Application Publication No. 2707371 are also preferred.

[0129] (Dye B, Dye C) Dye B is not particularly limited as long as it is a dye that has a main absorption wavelength band in the wavelength range of 480 to 520 nm in the optical absorption filter of the present invention, and various dyes can be used. Furthermore, dye C is not particularly limited as long as it is a dye that has a main absorption wavelength band in the wavelength range of 560 to 610 nm in the optical absorption filter of the present invention, and various dyes can be used. In addition, the wavelength range of the main absorption wavelength band of dye B is preferably 485-520 nm, more preferably 490-520 nm, and even more preferably 490-515 nm. In addition, the wavelength range of the main absorption wavelength band of dye C is preferably 580-615 nm, more preferably 580-610 nm, and even more preferably 580-610 nm.

[0130] Specific examples of dye B include pyrrole methine (PM), rhodamine (RH), boron dipyrromethene (BODIPY), and squaraine (SQ), among other pigments (dyes). Specific examples of dye C include various pigments (dyes) such as tetraaza porphyrin (TAP), squaric acid cyanine, and cyanine (CY).

[0131] Among these, from the viewpoint that the absorption waveform in the main absorption wavelength band is sharp, squaric acid cyanine pigment is preferred as dye B and dye C, and squaric acid cyanine pigment represented by the following general formula (1) is more preferred. As described above, by using pigments with sharp absorption waveforms as dye B and dye C, the above-mentioned relationships (I) to (II) can be satisfied at an optimal level, and the original color tone of the image of the OLED display device can be maintained at a better level. That is, from the viewpoint of suppressing the above-mentioned color change, in the above-mentioned wavelength selective absorption layer, it is preferable that at least one of dye B and dye C is squaric acid cyanine pigment (preferably squaric acid cyanine pigment represented by the following general formula (1)), and more preferably that both dye B and dye C are squaric acid cyanine pigment (preferably squaric acid cyanine pigment represented by the following general formula (1)).

[0132] [Chemical Formula 10]

[0133] In general formula (1), A and B independently represent aryl groups that can have substituents, heterocyclic groups that can have substituents, or -CH=G, where G represents heterocyclic groups that can have substituents.

[0134] Regarding the definitions and preferred ranges of each substituent in general formula (1), unless otherwise specified, the descriptions relating to each substituent of the pigment represented by general formula (1) as described in paragraphs

[0073] to

[0095] ,

[0099] and

[0100] of International Publication No. 2021 / 221122 can be directly applied.

[0135] As a preferred embodiment of the pigment represented by the above general formula (1), a pigment represented by the following general formula (2) can be cited.

[0136] [Chemical Formula 11]

[0137] In general formula (2), A 1 It is the same as A in general formula (1). Preferably, it is a heterocyclic group containing a nitrogen-containing 5-membered ring.

[0138] In general formula (2), R 1 and R 2 Each can independently represent a hydrogen atom or a substituent. R 1 With R 2 They can be the same or different, and they can bond together to form a ring. As can be used as R 1 and R 2The substituents are not particularly limited, but examples include alkyl (methyl, ethyl, propyl, isopropyl, butyl, tert-butyl, isobutyl, pentyl, hexyl, octyl, dodecyl, trifluoromethyl, etc.), cycloalkyl (cyclopentyl, cyclohexyl, etc.), alkenyl (vinyl, allyl, etc.), alkynyl (ethynyl, propargyl, etc.), aryl (phenyl, naphthyl, etc.), heteroaryl (furanyl, thiophene, pyridinyl, pyrazinyl, pyrimidinyl, triazinyl, imidazole, pyrazolyl, thiazolyl, benzimidazole, benzoxazolyl, quinazolinyl, phthalazinyl, etc.), and heterocyclic groups (also known as heteroatom-containing cyclic groups, for example,Pyrroloalkyl, imidazoalkyl, morpholinyl, oxazolidinyl, etc.), alkoxy (methoxy, ethoxy, propoxy, etc.), cycloalkoxy (cyclopentoxy, cyclohexyloxy, etc.), aryloxy (phenoxy, naphthoxy, etc.), heteroaryloxy (aromatic heterocyclic thiols), alkylthio (methylthio, ethylthio, propylthio, etc.), cycloalkylthio (cyclopentoxy, cyclohexylthio, etc.), arylthio (phenylthio, naphthio, etc.), heteroarylthio (aromatic heterocyclic thiols), alkoxycarbonyl (methoxycarbonyl, ethoxycarbonyl, butoxycarbonyl, octoxycarbonyl, etc.), aryloxycarbonyl (phenoxycarbonyl, naphthoxycarbonyl, etc.), phosphoryl (dimethoxyphosphonyl, diphenylphosphonyl) ), aminosulfonyl (aminosulfonyl, methylaminosulfonyl, dimethylaminosulfonyl, butylaminosulfonyl, cyclohexylaminosulfonyl, octylaminosulfonyl, phenylaminosulfonyl, 2-pyridylaminosulfonyl, etc.), acyl (acetyl, ethylcarbonyl, propylcarbonyl, cyclohexylcarbonyl, octylcarbonyl, 2-ethylhexylcarbonyl, phenylcarbonyl, naphthylcarbonyl, pyridylcarbonyl, etc.), acyloxy (acetoxy, ethylcarbonyloxy, butylcarbonyloxy, octylcarbonyloxy, phenylcarbonyloxy, etc.), amide (methylcarbonylamino, ethylcarbonylamino, dimethylcarbonylamino, propylcarbonylamino, pentylcarbonylamino, cyclohexylcarbonylamino, 2-Ethylhexylcarbonylamino, octylcarbonylamino, dodecylcarbonylamino, phenylcarbonylamino, naphthylcarbonylamino, etc.), sulfonamide (methanesulfonylamino, octylsulfonylamino, 2-ethylhexylsulfonylamino, trifluoromethylsulfonylamino, etc.), carbamoyl (aminocarbonyl, methylaminocarbonyl, dimethylaminocarbonyl, propylaminocarbonyl, pentylaminocarbonyl, cyclohexylaminocarbonyl, octylaminocarbonyl, 2-ethylhexylaminocarbonyl, dodecylaminocarbonyl, phenylaminocarbonyl, naphthylaminocarbonyl, 2-pyridylaminocarbonyl, etc.), urea (methylurea, ethylurea, pentylurea, cyclohexylurea, octylurea, etc.) Dodecylurea, phenylurea, naphthylurea, 2-pyridylaminourea, etc.), alkylsulfonyl groups (methylsulfonyl, ethylsulfonyl, butylsulfonyl, cyclohexylsulfonyl, 2-ethylhexylsulfonyl, etc.), arylsulfonyl groups (phenylsulfonyl, naphthylsulfonyl, 2-pyridylsulfonyl, etc.), amino groups (amino, ethylamino, dimethylamino, butylamino, dibutylamino, cyclopentylamino, 2-ethylhexylamino, dodecylamino, aniline, naphthylamino, 2-pyridylamino, etc.), alkylsulfonyloxy groups (methanesulfonyloxy), cyano, nitro, halogen atoms (fluorine, chlorine, bromine, etc.), hydroxyl groups, etc. Preferably, the compounds are alkyl, alkenyl, aryl or heteroaryl, more preferably alkyl, aryl or heteroaryl, and even more preferably alkyl.

[0139] Can be used as R 1 and R 2The substituents can further have substituents. Examples of substituents that can be further had include those that can be used as R. 1 and R 2 The aforementioned substituents and the substituents X that A, B, and G in the aforementioned general formula (1) may have (substituent X described in paragraphs

[0079] to

[0095] of International Publication No. 2021 / 221122). Furthermore, R 1 With R 2 They can bond together to form a ring, R 1 Or R 2 With B 2 Or B 3 The substituents can bond together to form a ring. The ring formed at this time is preferably a heterocyclic or heteroaromatic ring. The size of the ring is not particularly limited, but a 5-membered or 6-membered ring is preferred. Furthermore, the number of rings formed is not particularly limited; it can be one or more. For example, R... 1 With B 2 The substituents and R 2 With B 3 The substituents are bonded together to form two rings.

[0140] In general formula (2), B 1 B 2 B 3 and B 4 Each can independently represent a carbon atom or a nitrogen atom. Contains B. 1 B 2 B 3 and B 4 The ring is an aromatic ring. B is preferred. 1 ~B 4 It has at least two carbon atoms, preferably B. 1 ~B 4 It consists entirely of carbon atoms. Can be used as B 1 ~B 4 The carbon atom has a hydrogen atom or a substituent. It can be used as B. 1 ~B 4 The number of substituent carbon atoms in the carbon atom is not particularly limited, but is preferably 0, 1, or 2, more preferably 1. In particular, B is preferred. 1 and B 4 It consists of carbon atoms, and at least one of them has a substituent. As can be used as B 1 ~B 4 The substituents that can be present on the carbon atom are not particularly restricted; examples of substituents that can be used as R are given. 1 and R 2The above-mentioned substituents are preferably alkyl, alkoxy, alkoxycarbonyl, aryl, acyl, amide, sulfonamide, carbamoyl, alkylsulfonyl, arylsulfonyl, amino, cyano, nitro, halogen atom, or hydroxyl, and more preferably alkyl, alkoxy, alkoxycarbonyl, aryl, acyl, amide, sulfonamide, carbamoyl, amino, cyano, nitro, halogen atom, or hydroxyl. Can be used as B 1 ~B 4 The carbon atom may have substituents that can be further substituents. As one such substituent, R in the aforementioned general formula (2) can be cited. 1 and R 2 Substituents that may be further present and substituents X that A, B and G in the aforementioned general formula (1) may have (substituents X described in paragraphs

[0079] to

[0095] of International Publication No. 2021 / 221122).

[0141] As can be used as B 1 and B 4 The substituents present on the carbon atom are further preferably alkyl, alkoxy, hydroxy, amide, sulfonamide or carbamoyl, particularly preferably alkyl, alkoxy, hydroxy, amide or sulfonamide, and most preferably hydroxy, amide or sulfonamide. As can be used as B 2 and B 3 The substituents on the carbon atom are more preferably alkyl, alkoxy, alkoxycarbonyl, acyl, amino, cyano, nitro or halogen atoms, and particularly preferably any one of the substituents is an electron-withdrawing group (e.g. alkoxycarbonyl, acyl, cyano, nitro or halogen atom).

[0142] The pigment represented by the above general formula (2) is preferably a pigment represented by any one of the following general formulas (3), (4) and (5).

[0143] [Chemical Formula 12]

[0144] In general formula (3), R 1 and R 2 Each of them independently represents a hydrogen atom or a substituent, and is related to R in the general formula (2) above. 1 and R 2 They have the same meaning and the same preferred range. In general formula (3), B 1 ~B 4 Each of them independently represents a carbon atom or a nitrogen atom, and is related to B in the general formula (2) above. 1 ~B 4 They have the same meaning and the same preferred range.

[0145] In general formula (3), R 3 and R 4 Each can independently represent a hydrogen atom or a substituent. As can be used as R 3 and R 4 The substituents are not particularly limited, and examples of substituents that can be used as R above can be given. 1 and R 2 The substituents are the same groups. However, it can be used as R 3 The substituents are preferably alkyl, alkoxy, amino, amide, sulfonamide, cyano, nitro, aryl, heteroaryl, heterocyclic, alkoxycarbonyl, carbamoyl, or halogen atoms, more preferably alkyl, aryl, or amino, and even more preferably alkyl. As can be used as R 4 The substituents are preferably alkyl, aryl, heteroaryl, heterocyclic, alkoxy, alkoxycarbonyl, acyl, acyloxy, amide, carbamoyl, amino, or cyano, more preferably alkyl, alkoxycarbonyl, acyl, carbamoyl, or aryl, and even more preferably alkyl.

[0146] Can be used as R 3 and R 4 The alkyl group can be any of straight-chain, branched, or cyclic, but straight-chain or branched is preferred. The alkyl group preferably has 1 to 12 carbon atoms, more preferably 1 to 8. Examples of alkyl groups are methyl, ethyl, n-propyl, isopropyl, tert-butyl, 2-ethylhexyl, and cyclohexyl, more preferably methyl and tert-butyl.

[0147] [Chemical Formula 13]

[0148] In general formula (4), R 1 and R 2 Each of them independently represents a hydrogen atom or a substituent, and is related to R in the general formula (2) above. 1 and R 2 They have the same meaning and the same preferred range. In general formula (4), B 1 ~B 4 Each of them independently represents a carbon atom or a nitrogen atom, and is related to B in the general formula (2) above. 1 ~B 4 They have the same meaning and the same preferred range.

[0149] In general formula (4), R 5 and R 6 Each can independently represent a hydrogen atom or a substituent. As can be used as R 5 and R 6 The substituents are not particularly limited, and examples of substituents that can be used as R above can be given. 1and R 2 The substituents are the same groups. However, it can be used as R 5 The substituents are preferably alkyl, alkoxy, aryloxy, amino, cyano, aryl, heteroaryl, heterocyclic, acyl, acyloxy, amide, sulfonamide, urea, or carbamoyl, more preferably alkyl, alkoxy, acyl, amide, or amino, and even more preferably alkyl. Can be used as R 5 The meaning of alkyl and can be used as R in general formula (3) 3 The meanings of alkyl groups are the same, and the preferred ranges are also the same.

[0150] In general formula (4), it can be used as R 6 The substituents are preferably alkyl, alkenyl, aryl, heteroaryl, heterocyclic, alkoxy, cycloalkoxy, aryloxy, alkoxycarbonyl, acyl, acyloxy, amide, sulfonamide, alkylsulfonyl, arylsulfonyl, carbamoyl, amino, cyano, nitro or halogen atom, more preferably alkyl, aryl, heteroaryl or heterocyclic, and even more preferably alkyl or aryl. Can be used as R 6 The meaning of alkyl and can be used as R in general formula (3) 4 The meanings of alkyl groups are the same, and the preferred ranges are also the same. Can be used as R 6 The aryl group is preferably an aryl group having 6 to 12 carbon atoms, and more preferably a phenyl group. This aryl group may have substituents, and examples of such substituents include those listed in substituent group B, with particularly preferred substituents being alkyl, sulfonyl, amino, amide, or sulfonylamino groups having 1 to 10 carbon atoms. These substituents may further have substituents. Specifically, alkylsulfonylamino substituents are preferred.

[0151] -Substituent group B- Halogen atoms, alkyl, alkenyl, alkynyl, aryl, heterocyclic, cyano, hydroxyl, nitro, carboxyl, alkoxy, aminooxy, aryloxy, silyloxy, heterocyclic, acyloxy, carbamoyloxy, amino, acylamino, aminocarbonylamino, alkoxycarbonylamino, aryloxycarbonylamino, aminosulfonylamino, sulfonylamino (including alkyl or arylsulfonylamino), mercapto, alkylthio, arylthio, heterocyclic thio, aminosulfonyl, sulfonyl, alkyl or arylsulfinyl, sulfonyl (including alkyl or arylsulfonyl), acyl, aryloxycarbonyl, alkoxycarbonyl, carbamoyl, aryl or heterocyclic azo, imide, phosphinyl, oxyphosphinyl, oxyphosphinyloxy, oxyphosphinylamino, silylalkyl, etc.

[0152] [Chemical Formula 14]

[0153] In general formula (5), R1 and R 2 Each of them independently represents a hydrogen atom or a substituent, and is related to R in the general formula (2) above. 1 and R 2 They have the same meaning and the same preferred range. In general formula (5), B 1 ~B 4 Each of them independently represents a carbon atom or a nitrogen atom, and is related to B in the general formula (2) above. 1 ~B 4 They have the same meaning and the same preferred range.

[0154] In general formula (5), R 7 and R 8 Each can independently represent a hydrogen atom or a substituent. As can be used as R 7 and R 8 The substituents are not particularly limited, and examples of substituents that can be used as the aforementioned R can be given. 1 and R 2 The substituents are the same groups. However, it can be used as R 7 The substituents, preferred range, more preferred range and further preferred range are the same as those that can be used as R in general formula (4). 5 The substituents are the same. It can be used as R. 5 alkyl groups and those that can be used as the above R 3 The meanings of alkyl groups are the same, and the preferred ranges are also the same.

[0155] In general formula (5), it can be used as R 8 The substituents, preferred range, more preferred range and further preferred range are the same as those that can be used as R in general formula (4). 6 The substituents are the same. It can be used as R. 8 The preferred range of alkyl and aryl groups is the same as that of R used in the above general formula (4). 6 The alkyl and aryl groups have the same meaning and the same preferred range.

[0156] As for the aforementioned squaric acid cyanine pigment, any squaric acid cyanine pigment represented by any one of the general formulas (1) to (5) can be used without particular restriction. For example, compounds described in Japanese Patent Application Publication No. 2006-160618, International Publication No. 2004 / 005981, International Publication No. 2004 / 007447, Dyes and Pigment, 2001, 49, pp. 161-179, International Publication No. 2008 / 090757, International Publication No. 2005 / 121098, and Japanese Patent Application Publication No. 2008-275726 can be cited.

[0157] As a specific example of a pigment represented by any one of general formulas (1) to (5), the compounds described in paragraphs

[0119] to

[0122] of International Publication No. 2021 / 221122 may be cited. However, the present invention is not limited to these. Furthermore, in addition to the specific examples mentioned above, as specific examples of pigments represented by any of the general formulas (3) to (5), the compounds described in paragraphs

[0124] to

[0132] of International Publication No. 2021 / 221122 can be cited. However, the present invention is not limited to these.

[0158] As a preferred embodiment of the pigment represented by the above general formula (1), a pigment represented by the following general formula (6) can be cited.

[0159] [Chemical Formula 15]

[0160] In general formula (6), R 3 and R 4 Each of the above formulas (3) independently represents a hydrogen atom or a substituent, and R represents the hydrogen atom or substituent. 3 and R 4 They have the same meaning and the same preferred range. In general formula (6), A 2 It is the same as A in general formula (1). Preferably, it is a heterocyclic group containing a nitrogen-containing 5-membered ring.

[0161] The pigment represented by the above general formula (6) is preferably a pigment represented by any one of the following general formulas (7), (8) and (9).

[0162] [Chemical Formula 16]

[0163] In general formula (7), R 3 and R 4 Each of the above formulas (3) independently represents a hydrogen atom or a substituent, and R represents the hydrogen atom or substituent. 3 and R 4 They have the same meaning and the same preferred range. (2 Rs) 3 and 2 Rs 4 They can be the same or different.

[0164] [Chemical Formula 17]

[0165] In general formula (8), R 3 and R 4 Each of the above formulas (3) independently represents a hydrogen atom or a substituent, and R represents the hydrogen atom or substituent. 3 They have the same meaning and the same preferred range. In general formula (8), R 5 and R 6 Each of the above formulas (4) independently represents a hydrogen atom or a substituent, and R represents the hydrogen atom or substituent. 5 and R 6 They have the same meaning and the same preferred range.

[0166] [Chemical Formula 18]

[0167] In general formula (9), R 3 and R 4 Each of the above formulas (3) independently represents a hydrogen atom or a substituent, and R represents the hydrogen atom or substituent. 3 They have the same meaning and the same preferred range. In general formula (9), R 7 and R 8 Each of the above formulas (5) independently represents a hydrogen atom or a substituent, and R represents the hydrogen atom or substituent. 7 and R 8 They have the same meaning and the same preferred range.

[0168] In this invention, when using squaric acid cyanine pigment as dye B, any squaric acid cyanine pigment represented by any one of the general formulas (6) to (9) can be used without particular limitation. For example, compounds described in Japanese Patent Application Publication No. 2002-97383 and Japanese Patent Application Publication No. 2015-68945 can be cited. As a specific example of a squaric acid cyanine pigment represented by any one of general formulas (6) to (9), the compounds described in International Publication Nos. 2021 / 221122

[0145] to

[0148] can be cited. However, the present invention is not limited to these.

[0169] (Integrated quencher-type pigment) The squaric acid cyanine pigment represented by the above general formula (1) can be a built-in quencher type pigment formed by linking the quencher portion to the pigment via a linking group through a covalent bond. The above-mentioned built-in quencher type pigment can also preferably be used as at least one of dyes B and C. That is, the above-mentioned built-in quencher type pigment is included in dye B or dye C according to the wavelength having the main absorption wavelength band. As a quencher component, for example, ferrocene-based substituent X (substituent X described in paragraphs

[0079] to

[0095] of International Publication No. 2021 / 221122) can be cited. Furthermore, quencher components in quencher compounds described in paragraphs

[0199] to

[0212] and

[0234] to

[0310] of International Publication No. 2019 / 066043 can also be cited.

[0170] Among the squaric acid cyanine pigments represented by general formula (1), specific examples of pigments belonging to the built-in quencher type pigments include the compounds described in International Publication Nos. 2021 / 221122

[0151] to

[0167] and the following compounds (C-121) and (C-122). However, the present invention is not limited to these.

[0171] [Chemical Formula 19]

[0172] (Dye D) Regarding dye D, there are no particular limitations as long as it has a main absorption wavelength band in the wavelength range of 640 to 780 nm in the optical absorption filter of the present invention, and various dyes can be used. Specific examples of dye D include porphyrin, squaric acid cyanine, cyanine (CY), indole aniline, and other pigments (dyes). Squamarine pigments represented by the following general formula (1) are preferably examples.

[0173] (The pigment represented by general formula (1))

[0174] [Chemical Formula 20]

[0175] In general formula (1), the manner in which A and B can be adopted is as described in general formula (1) for A and B in the aforementioned dyes B and C.

[0176] When dye D is a pigment represented by general formula (1), it is preferably a pigment represented by the following general formula (14).

[0177] [Chemical Formula 21]

[0178] In general formula (14), R 1 and R 2 R in the aforementioned general formula (2) 1 and R 2 They have the same meaning. Furthermore, R 41 and R 42 Also, R in the aforementioned general formula (2) 1 and R 2 They have the same meaning. Among them, R 1 R 2 R 41 and R 42 Preferably alkyl, alkenyl, aryl or heteroaryl, more preferably alkyl, aryl or heteroaryl, and even more preferably alkyl or aryl. R 1 R 2 R 41 and R 42 It can further have substituents. As an example of a substituent that can be further formed, R in the aforementioned general formula (2) can be cited. 1 and R 2 Substituents that may be further present and substituents X that A, B and G in the aforementioned general formula (1) may have (substituents X described in paragraphs

[0079] to

[0095] of International Publication No. 2021 / 221122).

[0179] B in general formula (14) 1 B 2 B 3 and B 4 Each of the above general formulas (2) contains B. 1 B 2 B 3 and B 4 The meanings are the same. Furthermore, B in general formula (14) 5 B 6 B 7 and B 8 Each of the above general formulas (2) contains B. 1 B 2 B 3 and B 4 They have the same meaning. Can be used as B 1 B 2 B 3 B 4 B 5 B 6 B 7 and B 8 The carbon atom may have a substituent that can be further substituented. As such a substituent that can be further substituented, the substituent X that A, B and G in the aforementioned general formula (1) can have (substituent X described in paragraphs

[0079] to

[0095] of International Publication No. 2021 / 221122).

[0180] In general formula (14), R 1 With R 2 They can bond together to form a ring, R 1 Or R 2 With B 2 Or B 3 The substituents can bond together to form a ring. Furthermore, R 41 With R 42 They can bond together to form a ring, R 41 Or R 42 With B6 Or B 7 The substituents can bond together to form a ring. In the above description, the formed ring is preferably a heterocyclic or heteroaryl ring, and the size of the formed ring is not particularly limited, but a 5-membered or 6-membered ring is preferred. Furthermore, the number of rings formed is not particularly limited; it can be one or more. For example, R... 1 With B 2 The substituents and R 2 With B 3 The substituents are bonded together to form two rings.

[0181] As specific examples of dye D, pigments represented by general formula (1) include compounds described in International Publication Nos. 2023 / 228799

[0097] to

[0099] . However, the present invention is not limited to these.

[0182] Furthermore, the indole aniline dye represented by general formula (v) in the aforementioned light absorption vanishing layer can also be preferably used as dye D in the aforementioned wavelength selective absorption layer.

[0183] The total content of the dyes (preferably dyes A to D) in the wavelength-selective absorption layer is preferably 0.10% by mass or more, more preferably 0.15% by mass or more, even more preferably 0.20% by mass or more, particularly preferably 0.25% by mass or more, and especially preferably 0.30% by mass or more. If the total content of dyes A to D in the wavelength-selective absorption layer is at or above the lower limit of the above-mentioned preferred values, a good anti-reflection effect can be obtained. Furthermore, the total content of the dyes (preferably dyes A to D) in the wavelength-selective absorption layer is generally 50% by mass or less, preferably 40% by mass or less, more preferably 30% by mass or less, even more preferably 15% by mass or less, and particularly preferably 10% by mass or less. That is, the total content of the dyes (preferably dyes A to D) in the wavelength selective absorption layer is preferably 0.10 to 50% by mass, more preferably 0.15 to 40% by mass, further preferably 0.20 to 30% by mass, particularly preferably 0.25 to 15% by mass, and especially preferably 0.30 to 10% by mass.

[0184] The preferred contents of dyes A to D that may be contained in the wavelength-selective absorption layer are as follows. The content of dye A in the wavelength-selective absorption layer is preferably 0.01–45% by mass, more preferably 0.1–30% by mass. The content of dye C in the wavelength-selective absorption layer is preferably 0.01–30% by mass, more preferably 0.1–10% by mass. The content of dye D in the wavelength-selective absorption layer is preferably 0.05–50% by mass, more preferably 0.2–40% by mass. When the wavelength selective absorption layer contains all four dyes A to D, the preferred mass ratio of each dye A to D in the wavelength selective absorption layer is dye A: dye B: dye C: dye D = 1:0.1 to 10: 0.05 to 5: 0.1 to 10, more preferably 1:0.2 to 5: 0.1 to 3: 0.2 to 5.

[0185] Furthermore, when at least one of dyes B and C is the aforementioned built-in quencher type pigment, from the viewpoint of antireflective effect, the content of the aforementioned built-in quencher type pigment relative to 100% by mass of the wavelength-selective absorption layer is preferably 0.1% by mass or more. The upper limit is preferably 45% by mass or less. That is, preferably 0.1% to 45% by mass.

[0186] <Resin> The resin contained in the wavelength-selective absorption layer (hereinafter also referred to as "matrix resin") is not particularly limited as long as it can disperse (preferably dissolve) the dye. Among them, a resin that can satisfy the requirements of suppressing external light reflection and suppressing brightness reduction, and can maintain the original color tone of the image of the OLED display device at an excellent level is preferred. When at least one of dyes B and C is a squaricine pigment represented by the above general formula (1), the matrix resin is preferably a low-polarity matrix resin in which the squaricine pigment can exhibit sharper absorption. The squaricine pigment exhibits sharper absorption, thereby satisfying the above relationships (I) to (VI) at a preferred level, and maintaining the original color tone of the image in the OLED display device at a superior level. Here, low polarity means that the fd value defined by the following relationship I is preferably 0.50 or higher. Relationship I: fd = δd / (δd + δp + δh) In Equation I, δd, δp, and δh represent the terms corresponding to the London dispersion force, the dipole-dipole force, and the hydrogen bond force, respectively, relative to the solubility parameter δt calculated by the Hoy method. The specific calculation methods are described later. That is, fd represents the ratio of δd to the sum of δd, δp, and δh. By setting the fd value to 0.50 or higher, it is easy to obtain a sharper absorption waveform. Furthermore, when the wavelength-selective absorption layer contains two or more matrix resins, the fd value is calculated as follows. fd=Σ(w i •fd i ) Here, w i fd represents the mass fraction of the i-th matrix resin. i This represents the fd value of the i-th matrix resin.

[0187] -The term δd corresponding to the London dispersion force- The term δd corresponding to the London dispersion force refers to the term in the literature "Properties of Polymers 3". rd The δd was calculated using the method described in the “2) Method of Hoy (1985, 1989)” section on pages 214-220 of ELSEVIER (1990), and the calculation was performed based on the description in the above section of the aforementioned literature.

[0188] -The term δp- corresponding to dipole-dipole force- The term δp corresponding to the dipole-dipole force refers to the term in reference "Properties of Polymers 3". rd The δp was calculated using the method described in the “2) Method of Hoy (1985, 1989)” section on pages 214-220 of ELSEVIER (1990), and the calculation was performed based on the description in the above section of the aforementioned literature.

[0189] -The term δh corresponding to hydrogen bond force- The term δh corresponding to hydrogen bonding force refers to the value in reference "Properties of Polymers 3". rd The δh calculated by Amorphous Polymers is described in the “2) Method of Hoy (1985, 1989)” section on pages 214-220 of “ELSEVIER, (1990)”, and is calculated based on the description in the above section of the aforementioned literature.

[0190] Furthermore, if the matrix resin exhibits a certain degree of hydrophobicity, the moisture content of the wavelength selective absorption layer can be set to a low moisture content, for example, 0.5% or less, which is preferable from the viewpoint of improving the light resistance of the light absorption filter of the present invention, including the wavelength selective absorption layer (wherein, the light absorption disappearance layer is not included). In addition to polymers, resins can also contain any conventional components. However, the fd of the matrix resin mentioned above is a calculated value for the polymers constituting the matrix resin.

[0191] Preferred examples of the matrix resins mentioned above include polystyrene resins and cyclic polyolefin resins, with polystyrene resins being more preferred. Typically, the fd value of polystyrene resins is 0.45 to 0.60, and the fd value of cyclic polyolefin resins is 0.45 to 0.70. As described above, an fd value of 0.50 or higher is preferably used. Furthermore, in addition to these preferred resins, it is also preferable to use resin components that impart functionality to the wavelength-selective absorption layer, such as the elongation resin component and the peelability control resin component described later. That is, in this invention, the matrix resin is used in the sense that it includes both elongation resin components and peelability control resin components, in addition to the resins described above. From the viewpoint of sharpening the absorption waveform of the pigment, it is preferable that the matrix resin includes polystyrene resin.

[0192] (Polystyrene resin) The polystyrene included in the aforementioned polystyrene resin refers to a polymer containing styrene. Preferably, the polystyrene contains 50% by mass or more of styrene. The wavelength-selective absorption layer may contain one type of polystyrene or two or more types. Here, styrene refers to a monomer-derived structural unit having a styrene backbone in its structure. From the viewpoint of controlling the photoelasticity and hygroscopicity to values ​​within the preferred range for wavelength-selective absorption layers, polystyrene more preferably contains 70% by mass or more of styrene, and even more preferably 85% by mass or more. Furthermore, polystyrene is also preferably composed solely of styrene. The polystyrene resin described above can be directly applied to the polystyrene resin described in International Publication Nos. 2023 / 228799,

[0106] to

[0110] .

[0193] In addition to the polystyrene resin, the wavelength-selective absorption layer preferably also contains polyphenylene ether resin. By simultaneously containing both polystyrene resin and polyphenylene ether resin, the toughness of the wavelength-selective absorption layer is improved, and the generation of defects such as cracks can be suppressed even in harsh environments such as high temperature and high humidity. As the aforementioned polyphenylene ether resin, XYRON S201A, XYRON S202A, and XYRON S203A (all trade names) manufactured by Asahi Kasei Corp. are preferred. Furthermore, a resin obtained by pre-mixing polystyrene resin and polyphenylene ether resin can be used. As a mixed resin of polystyrene resin and polyphenylene ether resin, XYRON 1002H, XYRON 1000H, XYRON 600H, XYRON 500H, XYRON 400H, XYRON 300H, and XYRON 200H (all trade names) manufactured by Asahi Kasei Corp. are preferred, for example. In the aforementioned wavelength-selective absorption layer, when polystyrene resin and polyphenylene ether resin are contained, the mass ratio of the two, calculated as polystyrene resin / polyphenylene ether resin, is preferably 99 / 1 to 50 / 50, more preferably 98 / 2 to 60 / 40, and even more preferably 95 / 5 to 70 / 30. By setting the polyphenylene ether resin formulation within the aforementioned preferred range, the wavelength-selective absorption layer possesses sufficient toughness and allows for moderate solvent evaporation when solution film formation is performed.

[0194] (Cyclic polyolefin resin) As for the cyclic olefin compound that forms the cyclic polyolefin contained in the above-mentioned cyclic polyolefin resin (also known as polycyclic olefin resin), there are no particular limitations as long as it is a compound with a ring structure containing carbon-carbon double bonds. Examples include norbornene compounds, monocyclic cyclic olefin compounds other than norbornene compounds, cyclic conjugated diene compounds, and vinyl alicyclic hydrocarbon compounds. Examples of cyclic polyolefins include (1) polymers containing structural units derived from norbornene compounds, (2) polymers containing structural units derived from monocyclic cyclic olefin compounds other than norbornene compounds, (3) polymers containing structural units derived from cyclic conjugated diene compounds, (4) polymers containing structural units derived from vinyl alicyclic hydrocarbon compounds, and hydrides of polymers containing structural units derived from each of (1) to (4). In this invention, polymers containing structural units derived from norbornene compounds and polymers containing structural units derived from monocyclic cyclic olefin compounds include ring-opening polymers of each compound. As the aforementioned cyclic polyolefin resin, the cyclic polyolefin resin described in International Publication Nos. 2023 / 228799

[0112] to

[0125] can be directly applied.

[0195] Furthermore, the resin described in the above-mentioned light absorption disappearance layer can also be preferably used as the resin of the above-mentioned wavelength selective absorption layer.

[0196] The wavelength-selective absorption layer preferably contains 5% by mass or more of the matrix resin, more preferably 20% by mass or more, even more preferably 50% by mass or more, particularly preferably 70% by mass or more, and most preferably 80% by mass or more. The content of the matrix resin in the wavelength-selective absorption layer is typically 99.90% by mass or less, preferably 99.85% by mass or less. That is, preferably 5 to 99.90% by mass, more preferably 20 to 99.90% by mass, even more preferably 50 to 99.90% by mass, particularly preferably 70 to 99.90% by mass, and most preferably 80 to 99.85% by mass.

[0197] (Elongation resin component) The aforementioned wavelength-selective absorption layer can be appropriately selected to contain components exhibiting elongation (also known as elongating resin components) as resin components. Specifically, examples include acrylonitrile-butadiene-styrene resin (ABS resin), styrene-butadiene resin (SB resin), isoprene resin, butadiene resin, polyether-urethane resin, and silicone resin. Furthermore, these resins can be further appropriately hydrogenated. As the elongation resin component mentioned above, ABS resin or SB resin is preferred, and SB resin is more preferred.

[0198] The aforementioned SB resin can be, for example, commercially available resins. Examples of such commercially available products include TR2000, TR2003, TR2250 (trade names, manufactured by JSR Corporation), CLEAREN 210M, 220M, 730V (trade names, manufactured by Denka Company Limited), ASAFLEX 800S, 805, 810, 825, 830, 840 (trade names, manufactured by Asahi Kasei Corp.), EPOREX SB2400, SB2610, SB2710 (trade names, manufactured by Sumitomo Chemical Co., Ltd.), etc.

[0199] The wavelength-selective absorption layer preferably contains 15 to 95% by mass of the elongation resin component in the matrix resin, more preferably 20 to 50% by mass, and even more preferably 25 to 45% by mass.

[0200] As the above-mentioned elongation resin component, when a specimen with a thickness of 30 μm and a width of 10 mm is prepared by using the elongation resin component alone, the elongation at break at 25°C is preferably 10% or more, and more preferably 20% or more, when measured according to JIS 7127.

[0201] <Other Ingredients> In addition to the aforementioned components (dye, resin, and free radical generator in the light absorption fading layer and wavelength selective absorption layer of the present invention), the light absorption fading layer and wavelength selective absorption layer may also contain leveling agents (surfactants), etc.

[0202] (Leveling agent) The aforementioned light absorption vanishing layer and wavelength selective absorption layer can each appropriately contain a leveling agent (surfactant). Commonly used compounds can be used as leveling agents, with fluorinated surfactants being particularly preferred. Specifically, for example, compounds described in paragraphs

[0028] to

[0056] of Japanese Patent Application Publication No. 2001-330725 can be cited, and copolymers consisting of fluorinated alkyl structural units and structural units derived from (meth)acrylate alkyl esters in copolymers represented by formula (IV) described in paragraph

[0054] of Japanese Patent Application Publication No. 2001-330725 are also preferred. Furthermore, the MEGAFACE F (trade name) series manufactured by DIC Corporation can also be used as a commercially available product. The leveling agent content in the aforementioned light absorption vanishing layer or wavelength selective absorption layer can be appropriately adjusted according to the purpose.

[0203] In addition to the components mentioned above, the light absorption fading layer and wavelength selective absorption layer may also contain low molecular weight plasticizers, oligomer plasticizers, delay modifiers, ultraviolet absorbers, degradation inhibitors, peeling accelerators, infrared absorbers, antioxidants, fillers, and compatibilizers, respectively.

[0204] (Matte agent) To impart slip properties and prevent agglomeration, microparticles can be added to the surface of the optical absorption filter of the present invention. Preferably, these microparticles are silicon dioxide (SiO2), whose surface is coated with hydrophobic groups and which are secondary particles. Alternatively, titanium dioxide, alumina, zirconium oxide, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate, and calcium phosphate can be used as microparticles, either together with or in place of silicon dioxide. Commercially available microparticles include R972 and NX90S (both manufactured by NIPPON AEROSIL CO.,LTD., trade names).

[0205] These microparticles act as a so-called matting agent, forming tiny irregularities on the surface of the light absorption filter of the present invention by adding microparticles. Even if the light absorption filters of the present invention overlap each other or other films due to these irregularities, they will not stick to each other, thus ensuring slipability. In the case where the optical absorption filter of the present invention contains an extinction agent as particulate matter, if there are 10 micro-protrusions caused by the protrusions of the particulate matter protruding from the filter surface... 4 pcs / mm 2 For protrusions with a height of 30nm or more, the improvement in sliding properties and agglomeration is particularly significant.

[0206] As a method for imparting microparticles to the surface of the optical absorption filter of the present invention, methods such as multilayer casting and coating can be cited. The content of the extinction agent in the optical absorption filter of the present invention can be appropriately adjusted according to the purpose. In addition, the matting agent (microparticles) added (also referred to as imparted to the surface) to the surface of the light absorption filter of the present invention is also directly present on the surface of the filter of the present invention obtained by using the light absorption filter of the present invention, which can prevent the filters of the present invention from adhering to each other or to other films when they overlap.

[0207] <Manufacturing Method of Optical Absorption Filter> (Manufacturing method of light absorption vanishing layer and wavelength selective absorption layer) The light absorption vanishing layer and wavelength selective absorption layer in the optical absorption filter of the present invention can be manufactured by conventional methods, such as solution film formation, melt extrusion, or any method of forming a coating on a substrate film (support film), and can also be appropriately combined with stretching. The light absorption vanishing layer and wavelength selective absorption layer in the optical absorption filter of the present invention are preferably manufactured by coating. As for the above-mentioned solution film-forming method and melt extrusion method, except that the "light absorption filter" is replaced with a "light absorption disappearance layer" or a "wavelength selective absorption layer", the solution film-forming method and melt extrusion method described in International Publication No. 2021 / 132674

[0197] to

[0203] can be directly applied.

[0208] (Coating method) In the coating method, a solution of a material with a light-absorbing fading layer or a wavelength-selective absorption layer is applied to a support film to form a coating. To control adhesion to the coating, a release agent or similar agent can be pre-applied to the surface of the support film. Furthermore, the coating can be formed on the support film via any resin layer. The coating can be used in subsequent processes after being laminated with other components via an adhesive layer and then peeled off from the support film. Regarding the adhesive constituting the adhesive layer, any adhesive can be appropriately used. Additionally, the support film can be appropriately stretched while the solution of the material with the light-absorbing fading layer or wavelength-selective absorption layer is applied to the support film, or while the coating is laminated.

[0209] From the perspectives of being able to dissolve or disperse materials for light-absorbing fading layers or wavelength-selective absorption layers, being able to easily form a uniform surface in the coating and drying processes, ensuring solution preservation, and having a suitable saturated vapor pressure, the solvent for the solution of the material used for light-absorbing fading layers or wavelength-selective absorption layers can be appropriately selected.

[0210] -Addition of components that constitute the light absorption vanishing layer or wavelength-selective absorption layer- The timing of adding the aforementioned dye and free radical generator to the material of the light-absorbing fading layer is not particularly limited as long as they are added during film formation. For example, they can be added during the synthesis of the polymer constituting the matrix resin, or they can be mixed with the material of the light-absorbing fading layer during the preparation of the coating liquid. Furthermore, if the free radical generator comprises a combination of compound A and compound B, and compound A is bonded to the polymer constituting the resin, compound A can be added when adding the polymer constituting the resin. The timing of adding the dye to the material of the wavelength-selective absorption layer is not particularly limited as long as it is added during film formation. For example, it can be added during the synthesis of the polymer constituting the resin, or it can be mixed with the material of the wavelength-selective absorption layer during the preparation of the coating liquid.

[0211] -Support membrane- The thickness of the support film used to form a light-absorbing vanishing layer or a wavelength-selective absorption layer by coating or the like is preferably 5 to 100 μm, more preferably 10 to 75 μm, and even more preferably 15 to 55 μm. If the film thickness is above or below the aforementioned preferred lower limit, sufficient mechanical strength is easily ensured, and defects such as curling, wrinkling, and bending are less likely to occur. Furthermore, if the film thickness is below or below the aforementioned preferred upper limit, when storing multilayer films of the light-absorbing vanishing layer or wavelength-selective absorption layer and the support film, or multilayer films including the light-absorbing vanishing layer, the wavelength-selective absorption layer, and the support film, for example, in the form of long, thin rolls, the surface pressure applied to the multilayer film is easily adjusted within an appropriate range, and adhesion defects are less likely to occur.

[0212] The surface energy of the support film is not particularly limited, but by adjusting the correlation between the surface energy of the material and coating solution of the light absorption vanishing layer or wavelength selective absorption layer and the surface energy of the surface of the support film on the side where the light absorption vanishing layer or wavelength selective absorption layer is formed, the adhesion between the light absorption filter and the support film of the present invention can be adjusted. If the surface energy difference is reduced, there is a tendency for the adhesion to increase; if the surface energy difference is increased, there is a tendency for the adhesion to decrease. The surface energy difference can be appropriately set.

[0213] Furthermore, the surface unevenness of the support film is not particularly limited, but the correlation between the surface energy, hardness, and surface unevenness of the surface opposite to the support film in the light absorption filter according to the present invention and the surface energy and hardness of the surface of the support film opposite to the side forming the light absorption filter of the present invention can, for example, be adjusted to prevent adhesion defects when storing the multilayer film of the light absorption filter and the support film in the form of a long roll. If the surface unevenness is increased, there is a tendency to suppress adhesion defects; if the surface unevenness is decreased, there is a tendency for the surface unevenness of the light absorption filter of the present invention to be reduced, and the haze of the light absorption filter of the present invention to be reduced, which can be appropriately set.

[0214] Any material and film can be appropriately used as such a support film. Specific materials include polyester polymers (including polyethylene terephthalate), olefin polymers, cycloolefin polymers, (meth)acrylic acid polymers, cellulose polymers, and polyamide polymers. Furthermore, surface treatments can be applied appropriately to adjust the surface properties of the support film. To reduce surface energy, corona treatment, room temperature plasma treatment, or saponification treatment can be performed, for example; to increase surface energy, silicone treatment, fluorine treatment, or olefin treatment can be performed, for example.

[0215] (Diffusion inhibition layer) The optical absorption filter of the present invention preferably comprises a wavelength selective absorption layer, a diffusion suppression layer and a light absorption vanishing layer stacked sequentially, so that they are in direct contact in sequence. The aforementioned diffusion suppression layer only needs to have the effect of suppressing the diffusion of components such as dyes contained in the wavelength selective absorption layer into the light absorption eliminator layer by being disposed between the wavelength selective absorption layer and the light absorption eliminator layer, and also have the effect of suppressing the diffusion of components such as dyes and free radical generators contained in the light absorption eliminator layer into the wavelength selective absorption layer. In either the formation of the wavelength-selective absorption layer onto the light-absorbing vanishing layer, or in any of the states during the formation of the wavelength-selective absorption layer onto the light-absorbing vanishing layer, diffusion of components from the wavelength-selective absorption layer into the light-absorbing vanishing layer may occur. The optical absorption filter of the present invention, by providing a diffusion suppression layer between the wavelength-selective absorption layer and the light-absorption fading layer, as described above, can suppress the diffusion of components in the wavelength-selective absorption layer to the light-absorption fading layer and the diffusion of components in the light-absorption fading layer to the wavelength-selective absorption layer. Therefore, by irradiating the optical absorption filter of the present invention with ultraviolet light, the fading and decolorization reactions of the dye in the light-absorption fading layer are caused by compounds in the light-absorption fading layer that generate free radicals through ultraviolet irradiation. By providing the diffusion suppression layer, the filter of the present invention obtained using the optical absorption filter of the present invention can further achieve the desired light absorption characteristics derived from the wavelength-selective absorption layer and the light-absorption fading layer, respectively.

[0216] In a configuration where a wavelength-selective absorption layer, a diffusion inhibition layer, and a light absorption fading layer are sequentially stacked and brought into direct contact, it is considered that during the formation of the light absorption fading layer onto the diffusion inhibition layer or the formation of the wavelength-selective absorption layer onto the diffusion inhibition layer, the solvent in the coating liquid used to form the light absorption fading layer or the wavelength-selective absorption layer causes the diffusion inhibition layer to swell, resulting in an increase in the free volume of the diffusion inhibition layer. From this perspective, in the light absorption filter of the present invention, the resin constituting the diffusion inhibition layer disposed between the wavelength-selective absorption layer and the light absorption fading layer preferably has a low affinity for the solvent used when forming the wavelength-selective absorption layer or the light absorption fading layer on the diffusion inhibition layer. For example, when the light absorption fading layer is formed on the diffusion inhibition layer, if the dyes contained in the light absorption fading layer, compounds that generate free radicals upon ultraviolet irradiation, etc., are dissolved in an organic solvent (non-aqueous solvent), the resin constituting the diffusion inhibition layer is preferably a resin with low affinity for organic solvents, i.e., a water-soluble resin. Furthermore, when a wavelength-selective absorption layer is formed on the diffusion inhibition layer, if the dye and other components contained in the wavelength-selective absorption layer are dissolved in the raw materials (materials) in an organic solvent (non-aqueous solvent), the resin constituting the diffusion inhibition layer is preferably a resin with low affinity for organic solvents, i.e., a water-soluble resin. The affinity between the solvent used in forming the wavelength-selective absorption layer or the light absorption-disappearing layer and the resin constituting the diffusion-inhibiting layer can be evaluated using the solubility parameter δt calculated using the Hoy method. The solubility parameter δt can be obtained, for example, from the literature "Properties of Polymers 3". rd The method described in the “2) Method of Hoy (1985, 1989)” section on pages 214-220 of “ELSEVIER, (1990)” is used for calculation. In this invention, the absolute value of the difference between the δt value of the solvent used in forming the wavelength-selective absorption layer or the light absorption fading layer and the δt value of the resin constituting the diffusion inhibition layer is preferably 1.0 or more, more preferably 2.0 or more, further preferably 3.0 or more, and particularly preferably 4.0 or more. By adjusting the absolute value of the difference between the δt value of the solvent used in forming the wavelength-selective absorption layer or the light absorption fading layer and the δt value of the resin constituting the diffusion inhibition layer to the above-mentioned preferred value or above, when the liquid forming the wavelength-selective absorption layer or the light absorption fading layer is coated on the diffusion inhibition layer, the permeation of the solvent contained in the liquid forming the wavelength-selective absorption layer or the light absorption fading layer through the diffusion inhibition layer is suppressed. The swelling of the layer located below the diffusion inhibition layer (in the case of a wavelength-selective absorption layer disposed on the diffusion inhibition layer, it is a light absorption fading layer; in the case of a light absorption fading layer disposed on the diffusion inhibition layer, it is a wavelength-selective absorption layer) is effectively suppressed, which is therefore preferable. The upper limit of the absolute value of the difference between the δt value of the solvent used in forming the wavelength selective absorption layer or the light absorption eliminator layer and the δt value of the resin constituting the diffusion inhibition layer is actually 20.0 or less. The absolute value of the difference between the δt value of the solvent used in forming the wavelength selective absorption layer or the light absorption eliminator layer and the δt value of the resin constituting the diffusion inhibition layer is preferably 1.0 to 20.0, more preferably 2.0 to 20.0, even more preferably 3.0 to 20.0, and particularly preferably 4.0 to 20.0. Furthermore, when two or more solvents are used to form a wavelength-selective absorption layer or a light absorption-vanishing layer, the δt value of the solvent refers to the weight average of the δt values ​​of each solvent. Also, when the diffusion inhibition layer is composed of two or more resins, the δt value of the resin refers to the weight average of each resin.

[0217] [Resin] Water-soluble resin is preferred as the resin constituting the diffusion inhibition layer. The water-soluble resin can be any of thermosetting resin or thermoplastic resin. In the case of thermoplastic resin, it can be crystalline or amorphous. For example, polyvinyl alcohol, polyvinylpyridine, (meth)acrylic resin, polyurethane, polyester, epoxy resin, cellulose resin, etc., are preferably used as water-soluble resins. At least a portion of these water-soluble resins can be modified. The polyvinyl alcohols mentioned above can be modified or left unmodified. Examples of modified polyvinyl alcohols include those with acetyl groups, carboxyl groups, etc. From the viewpoint of further improving the barrier properties (permeation inhibition performance) of organic solvents, the degree of saponification of the above-mentioned polyvinyl alcohol is preferably 60.0 mol% or more, more preferably 80.0 mol% or more, and even more preferably 90.0 mol% or more. There is no particular upper limit, and it is practically 99.99 mol% or less. The degree of saponification of the above-mentioned polyvinyl alcohol is a value calculated according to the method described in JIS K 6726-1994. As the aforementioned (meth)acrylic resin, any resin containing at least one of structural units derived from (meth)acrylic acid and structural units derived from (meth)acrylate is acceptable, and resins containing structural units derived from (meth)acrylic acid are preferred. The proportion of structural units derived from (meth)acrylic acid in all structural units constituting the (meth)acrylic resin is preferably 70 to 100 mol%, more preferably 80 to 100 mol%, and even more preferably 90 to 100 mol%. From the viewpoint that the crystallization portion can effectively suppress the transmission of solvent molecules and that swelling caused by the organic solvent used in the dye layer is less likely to occur, the resin constituting the diffusion inhibition layer is preferably at least one of polyvinyl alcohol and (meth)acrylic resin, and more preferably at least one of polyvinyl alcohol and poly(meth)acrylic acid. Furthermore, from the viewpoint of enabling excellent adhesion between the layers constituting the light absorption filter of the present invention, the resin constituting the diffusion suppression layer is more preferably poly(meth)acrylic acid. The content of resin (preferably water-soluble resin) in the diffusion inhibition layer is preferably 90% by mass or more, and more preferably 95% by mass or more. There is no particular limitation on the upper limit, but it can also be set to 100% by mass.

[0218] From the viewpoint of further improving diffusion suppression capability, the thickness of the diffusion suppression layer is preferably 0.1 to 5.0 μm, more preferably 0.2 to 4.0 μm.

[0219] (Method for manufacturing diffusion inhibition layer) The method for forming the diffusion suppression layer is not particularly limited. For example, it can be made on a wavelength-selective absorption layer or a light absorption-disappearing layer by means of conventional methods such as spin coating and slot coating. The solvent used at this time can be used without particular restriction as long as it can produce the desired diffusion inhibition layer. For example, when the resin constituting the diffusion inhibition layer is a water-soluble resin, water is preferred; water-soluble solvents such as ethanol, isopropanol, etc.

[0220] <Film thickness of light absorption vanishing layer and wavelength selective absorption layer> The film thicknesses of the light absorption vanishing layer and the wavelength selective absorption layer are not particularly limited, but are preferably 1–18 μm, more preferably 1–12 μm, and even more preferably 1–8 μm. If the thickness is below the upper limit of these preferred values, the reduction in polarization caused by fluorescence emitted by the dye (pigment) can be suppressed by adding a high concentration of dye to the film. Furthermore, the quenching effect is readily apparent in the light absorption vanishing layer. On the other hand, if the thickness is above the lower limit of these preferred values, it is easier to maintain the uniformity of in-plane absorbance. In this invention, a film thickness of 1–18 μm means that, regardless of the location from which the thickness of the light absorption vanishing layer and the wavelength-selective absorption layer are measured, the thickness falls within the range of 1–18 μm. The same applies to film thicknesses of 1–12 μm and 2–8 μm. The film thickness can be measured using an electronic micrometer (e.g., manufactured by ANRITSU CORPORATION).

[0221] <Absorbance of the optical absorption filter of the present invention> In the optical absorption filter of the present invention, the absorbance at the wavelength of maximum absorption (hereinafter also simply referred to as "Ab(λ") is measured in the wavelength range of 400–700 nm. max In the above, the maximum absorbance is preferably 0.3 or more, more preferably 0.5 or more, and even more preferably 0.7 or more. However, the absorbance of the light absorption filter of the present invention can be adjusted according to the type of dye, the amount added, or the film thickness.

[0222] <Achromaticity of the light absorption disappearance layer> The light absorption fading layer in the light absorption filter of the present invention preferably has a decolorization rate of 85% or more, more preferably 87% or more, and even more preferably 90% or more, due to ultraviolet irradiation at 25°C. There is no particular upper limit, but 100% is also preferred. That is, the decolorization rate is preferably 85-100%, more preferably 87-100%, and even more preferably 90-100%. In addition, regarding the aforementioned decolorization rate, the Ab(λ) values ​​before and after the ultraviolet irradiation test... max The value of is calculated using the following formula. Decolorization rate (%) = 100 - (Ab(λ) after UV irradiation) max ) / Ab (λ) before ultraviolet irradiation max ))×100 In this ultraviolet irradiation test, an ultra-high pressure mercury lamp (e.g., manufactured by HOYA, trade name: UL750) was used at atmospheric pressure (101.33 kPa) and at room temperature (45°C) to irradiate the light absorption filter with an illuminance of 100 mW / cm². 2 Irradiation dose 2000 mJ / cm 2Ultraviolet rays. The absorbance, ultraviolet irradiation test, and decolorization rate described above can be measured and calculated using the methods described in the examples.

[0223] Furthermore, the aforementioned light absorption disappearance layer preferably does not experience almost any absorption (secondary absorption) originating from the new coloring structure that accompanies the decomposition of pigments. For example, it is possible to determine the absorbance at a specific wavelength and the above Ab(λ) max The ratio of the two wavelengths was used to confirm whether there was absorption originating from the newly colored structure accompanying pigment decomposition. For a specific wavelength, wavelengths were selected where the pigment showed almost no absorption before UV irradiation and where new absorption caused by pigment decomposition was observed. As a specific example, as described in the embodiments below, it is possible to determine the absorbance at a specific wavelength and the aforementioned Ab(λ). max The ratio of the two wavelengths was used to confirm whether there was absorption originating from the newly colored structure accompanying pigment decomposition. For a specific wavelength, wavelengths were selected where the pigment showed almost no absorption before UV irradiation and where new absorption caused by pigment decomposition was observed. As a specific example, as described in the embodiments described later, it is possible to determine the absorbance (hereinafter also referred to as "Ab(450)") relative to the above-mentioned Ab(λ) based on the absorbance within a wavelength of 450 nm. max The ratio of (II) to (I) is used to determine whether there is absorption from the new coloring structure accompanied by pigment decomposition. That is, the smaller the value obtained by subtracting the ratio of (I) below from the ratio below (II), the less absorption from the new coloring structure accompanied by pigment decomposition has occurred. This value is preferably less than 8.5%, more preferably less than 7.0%, and even more preferably less than 5.0%. There is no particular limitation on the lower limit, but from the viewpoint of making the evaluation related to the presence or absence of secondary absorption accompanied by pigment decomposition appropriate, it is practically -10% or more, preferably -6% or more. (I) (Ab(450) before UV irradiation / Ab(λ) before UV irradiation) max ))×100% (II) (Ab(450) after UV irradiation / Ab(λ) before UV irradiation) max ))×100% The presence or absence of absorption originating from the new coloring structure accompanying pigment decomposition can be determined and calculated using the methods described in the examples. Furthermore, the absorbance at a wavelength of 650 nm (hereinafter also simply referred to as "Ab(650)") can be used instead of the absorbance at a wavelength of 450 nm, and the value obtained by subtracting the ratio in (III) from the ratio in (IV) below can be evaluated. The preferred range of the value obtained by subtracting the ratio in (III) below from the ratio in (IV) below has the same meaning as the value obtained by subtracting the ratio in (I) from the ratio in (II) above. (III) (Ab(650) before UV irradiation / Ab(λ) before UV irradiation) max ))×100% (IV) (Ab(650) after UV irradiation / Ab(λ) before UV irradiation) max ))×100% Here, regarding the ultraviolet irradiation test, the ultraviolet irradiation test described above for the decolorization rate is preferred. The presence or absence of absorption originating from the new coloring structure accompanying pigment decomposition can be determined and calculated using the methods described in the examples.

[0224] In the aforementioned light absorption fading layer, by confirming that the values ​​of the decolorization rate and the presence or absence of absorption from the new coloring structure accompanying the decomposition of pigment both meet the preferred range, excellent decolorization can be exhibited.

[0225] In the filter obtained using the light absorption filter of the present invention, the ultraviolet-unirradiated portion (the portion with light absorption effect) in the light absorption vanishing layer preferably satisfies the Ab(λ) value involved in the light absorption filter of the present invention described above. max (Records).

[0226] <Processing of the Optical Absorption Filter of the Invention> The optical absorption filter of the present invention can be hydrophilized by any glow discharge treatment, corona discharge treatment, or alkaline saponification treatment, with corona discharge treatment being preferred. Methods disclosed in Japanese Patent Application Publication No. 6-094915 or Japanese Patent Application Publication No. 6-118232 are also preferred.

[0227] Furthermore, depending on the requirements, the obtained membrane can undergo heat treatment, superheated steam contact, or organic solvent contact processes. Additionally, surface treatment can be performed as appropriate.

[0228] Furthermore, as an adhesive layer, it is also possible to use a layer made of an adhesive composition that uses (meth)acrylic resin, styrene resin, silicone resin, etc. as a base polymer and adds crosslinking agents such as isocyanate compound, epoxy compound, and aziridine compound therein. Preferably, the adhesive layer is applicable to the OLED display device described later.

[0229] <Gas Barrier Layer> The optical absorption filter of the present invention may have a gas barrier layer on at least one side. When the optical absorption filter of the present invention has a gas barrier layer, it can be used as an optical absorption filter that achieves both excellent achromaticity and excellent lightfastness, and is preferably used to manufacture the filter described later. The material forming the gas barrier layer is not particularly limited. Examples include organic materials such as polyvinyl alcohol and polyvinylidene chloride (preferably crystalline resins), organic-inorganic hybrid materials such as sol-gel materials, SiO2, and SiO2. x SiON, SiN x Inorganic materials such as Al2O3 are also used. The gas barrier layer can be a single layer or multiple layers. In the case of multiple layers, examples include inorganic dielectric multilayer films and multilayer films obtained by alternating layers of organic and inorganic materials.

[0230] In the optical absorption filter of the present invention, by having at least an air-barrier layer on the surface in contact with air when using the optical absorption filter of the present invention (and further, the filter of the present invention described later), the reduction in the absorption intensity of the dye in the optical absorption filter of the present invention can be suppressed. As long as the air-barrier layer is provided at the interface of the optical absorption filter of the present invention in contact with air, the air-barrier layer may be provided only on one side of the optical absorption filter of the present invention or on both sides.

[0231] In the case where the gas barrier layer has a structure containing crystalline resin, it is preferable that the gas barrier layer contains crystalline resin and has a thickness of 0.1 μm to 10 μm, and that the oxygen permeability of the layer is 60 cc / m 2 •day•atm or less. In the aforementioned gas barrier layer, the “crystalline resin” is a resin that has a melting point that changes from a crystalline phase to a liquid phase when the temperature is increased, and can impart oxygen-related gas barrier properties to the aforementioned gas barrier layer. The above-mentioned "contains crystalline resin with a layer thickness of 0.1 μm to 10 μm, and the oxygen permeability of the layer is 60 cc / m" 2 The term "gas barrier layer below day•atm" is the same as the gas barrier layer described in International Publication No. 2022 / 149510

[0180] to

[0184] , and these descriptions can be directly applied.

[0232] <Manufacturing Method of Gas Barrier Layer> There are no particular limitations on the method for forming the gas barrier layer, but conventional methods can be used. For example, in the case of organic materials, methods such as spin coating and slot coating can be employed. Furthermore, methods such as attaching a commercially available resin-based gas barrier film or a pre-fabricated resin-based gas barrier film to the light absorption filter of this invention can be used. In the case of inorganic materials, methods such as plasma-enhanced chemical vapor deposition (CVD), sputtering, and evaporation can be used.

[0233] When the above-mentioned barrier layer is provided in the optical absorption filter of the present invention, for example, a method can be described as directly fabricating the barrier layer on the optical absorption filter of the present invention manufactured by the above-described manufacturing method. In this case, it is also preferable to perform corona treatment on the surface of the optical absorption filter of the present invention in which the barrier layer is provided. Furthermore, when any of the aforementioned optical functional films are provided, it is preferable to bond them via an adhesive layer. For example, it is also preferable to bond the optical functional films via an adhesive layer after providing a gas barrier layer on the light absorption filter of the present invention.

[0234] <Optical Functional Films> Without compromising the effectiveness of the invention, the optical absorption filter of the present invention may appropriately have the above-mentioned gas barrier layer or any optical functional film. Regarding any of the aforementioned optical functional films, there are no particular restrictions on optical properties or materials, but films containing at least one of cellulose ester resin, acrylic resin, cyclic olefin resin, and polyethylene terephthalate resin (or as a main component) are preferred. Furthermore, optically isotropic films or optically anisotropic retardation films can be used. Regarding any of the aforementioned optical functional films, as optical films containing cellulose ester resin, for example, FUJITAC TD80UL (trade name, manufactured by FUJIFILM Corporation) can be used. Regarding any of the aforementioned optical functional films, as optical films containing acrylic resins, the optical films containing (meth)acrylic resins containing styrene-based resins as described in Japanese Patent No. 4570042, the optical films containing (meth)acrylic resins having a glutarimide ring structure on the main chain as described in Japanese Patent No. 5041532, the optical films containing (meth)acrylic resins having a lactone ring structure as described in Japanese Patent Application Publication No. 2009-122664, and the optical functional films containing (meth)acrylic resins having glutaric anhydride units as described in Japanese Patent Application Publication No. 2009-139754 are all suitable. Furthermore, regarding any of the aforementioned optical functional films, as optical films containing cyclic olefin resins, the cyclic olefin resin films described after paragraph

[0029] of Japanese Patent Application Publication No. 2009-237376, the cyclic olefin resin films containing additives that reduce Rth described in Japanese Patent Application Publication No. 4881827, and Japanese Patent Application Publication No. 2008-063536 can be utilized.

[0235] [Filter] The filter of the present invention can be obtained by a method comprising the step of mask exposure of the optical absorption filter of the present invention by ultraviolet irradiation. In the filter of the present invention, the wavelength selective absorption layer and the light absorption vanishing layer derived from the optical absorption filter of the present invention will be referred to as the wavelength selective absorption layer and the light absorption vanishing layer of the filter of the present invention, respectively. The light absorption vanishing layer in the filter of the present invention has the following characteristics based on the pattern exposed by a mask irradiated with ultraviolet light (hereinafter also referred to as "mask pattern"): light-absorbing regions with light absorption effect and regions that cause light absorption to vanish (light absorption vanishing regions). On the other hand, the wavelength selective absorption layer in the filter of the present invention has light absorption characteristics that are almost identical to those of the wavelength selective absorption layer in the light absorption filter of the present invention, regardless of the mask exposure using ultraviolet light irradiation. That is, the light absorption filter of the present invention is exposed by ultraviolet light. The masked part of the light absorption filter of the present invention is not exposed and exists as a light-absorbing part with light absorption effect. The unmasked part is exposed, and the light absorption disappearance layer in the unmasked part is decolorized and becomes a light absorption disappearance part, and becomes a part with low light absorption. The aforementioned light-absorbing regions can display the desired absorbance. Furthermore, in the aforementioned light absorption disappearance region, the light absorption disappearance layer exhibits excellent achromaticity and almost no secondary absorption occurs accompanying the decomposition of the dye. Therefore, the light absorption disappearance layer in the filter of the present invention can exhibit near-colorless optical properties, and the wavelength selective absorption layer in the filter of the present invention can exhibit unique light absorption characteristics.

[0236] <Method for manufacturing filters> The filter of the present invention is obtained by irradiating the light absorption filter of the present invention with ultraviolet light through a mask exposure. The mask pattern can be appropriately adjusted to obtain the filter of the present invention having a desired pattern composed of regions with high light absorption and regions with low light absorption. In particular, in this invention, it is preferable to configure a mask pattern such that the regions corresponding to the non-display portions (regions that do not emit display light) in the display device are regions with high light absorption, and the regions corresponding to the display portions (regions that emit display light) in the display device are regions with low light absorption. That is, in the light absorption filter of this invention, by irradiating with ultraviolet light using a mask pattern that masks the regions corresponding to the non-display portions in the display device but does not mask the regions corresponding to the display portions in the display device, the filter of this invention can be appropriately obtained. In a display device, the area ratio of the non-display portion to the display portion is typically 90 / 10 to 60 / 40. From the viewpoint of achieving a higher level of suppression of external light reflection, reflected hue, and brightness reduction, an area ratio of 80 / 20 to 60 / 40 is preferred. Furthermore, even in a display device with an area ratio of 90 / 10 for the non-display portion, the filter of the present invention, obtained by mask exposure of the light absorption filter including the aforementioned light absorption vanishing layer and wavelength selective absorption layer, allows for separate control of the light absorption characteristics of the display portion and the non-display portion. Therefore, a higher level of suppression of external light reflection, reflected hue, and brightness reduction can be achieved, and the hue of the reflected light can be adjusted to neutral. The ultraviolet irradiation conditions can be appropriately adjusted to obtain the filter of the present invention with a portion exhibiting low light absorption. For example, regarding the pressure conditions, it can be conducted at atmospheric pressure (101.33 kPa), and regarding the temperature conditions, it can be conducted under mild temperature conditions of 10–60°C. The lamp output can be set to 10–320 W / cm, and the lamp used can be a mercury lamp such as an air-cooled metal halide lamp or an ultra-high pressure mercury lamp. Furthermore, the irradiation dose can be set to 200–5000 mJ / cm. 2 .

[0237] The filter of the present invention may have the optical functional film described in the optical absorption filter of the present invention. Furthermore, the filter of the present invention may have a layer containing an ultraviolet absorber. There are no particular limitations on the ultraviolet absorber; commonly used compounds can be used, for example, the ultraviolet absorber in the ultraviolet absorbing layer described later. There are also no particular limitations on the resin constituting the layer containing the ultraviolet absorber; for example, the resin in the ultraviolet absorbing layer described later can be used. The content of ultraviolet absorbers in the layer containing the above-mentioned ultraviolet absorbers can be appropriately adjusted according to the purpose.

[0238] [Intermediate products for display components and display components] The intermediate product of the display element of the present invention includes the light absorption filter of the present invention. As long as the intermediate product of the display element of the present invention includes the light absorption filter of the present invention, it can use the structure of display elements commonly used in display devices without particular limitation as other structures, such as OLED display elements, inorganic EL display elements, and liquid crystal cells (liquid crystal display elements) described later. In the intermediate product of the display element of the present invention, the light absorption filter of the present invention can be directly contacted and laminated with the display element, or it can be laminated via an adhesive layer. The adhesive layer described below can be used as the adhesive layer. Furthermore, in addition to the adhesive layer, it can be further laminated via any layer such as a barrier film. Regarding the barrier film or other arbitrary layer, any layer commonly used in display elements can be appropriately used; for example, the aforementioned description of a gas barrier layer can be used for the barrier film. In the intermediate product of the display element of the present invention, regardless of the layered structure, it is sufficient to bring any one of the wavelength selective absorption layer and the light absorption annihilation layer in the light absorption filter of the present invention close to the display element. In the intermediate product of the display element of the present invention, from the viewpoint of annihilating the light absorption annihilation layer with less ultraviolet irradiation, a layered structure in which the wavelength selective absorption layer in the light absorption filter of the present invention is closer to the light absorption annihilation layer relative to the display element is preferred. By exposing the intermediate product of the display element of the present invention to a mask under ultraviolet light, a display element of the present invention is obtained by converting the light absorption filter of the present invention included in the intermediate product of the display element of the present invention into a filter of the present invention. That is, the intermediate product of the display element of the present invention is an intermediate product that serves as a preliminary stage of the display element of the present invention, while the display element of the present invention refers to the finished product that serves as a display element. The display element of the present invention only needs to include a display element corresponding to the assembled display device. The display element including the OLED display element is referred to as the OLED display element of the present invention, the display element including the inorganic EL display element is referred to as the inorganic EL display element of the present invention, and the display element including the liquid crystal display element is referred to as the liquid crystal display element of the present invention.

[0239] OLED display devices The organic electroluminescent display device of the present invention (also known as an organic EL (electroluminescence) display device or an OLED (Organic Light Emitting Diode) display device, and in this invention, simply referred to as an OLED display device) includes the filter of the present invention or the OLED display element of the present invention. As the OLED display device of the present invention, as long as it includes the filter of the present invention or the OLED display element of the present invention, other structures can be used without particular limitation, and the structure of commonly used OLED display devices can be used. Furthermore, the OLED display element of the present invention is assembled into the OLED display device of the present invention with the filter of the present invention as the external light source side. The structure of the OLED display device of the present invention is not particularly limited, but when including the filter of the present invention, for example, a display device may be provided in which, from the side opposite to external light, glass, a layer containing TFTs (thin-film transistors), an OLED display element, a blocking film, an adhesive layer, the filter of the present invention, the adhesive layer, glass, the adhesive layer, and a surface film are included in sequence. Furthermore, when including the OLED display element of the present invention, for example, a display device may be provided in which, from the side opposite to external light, glass, a layer containing TFTs (thin-film transistors), the OLED display element of the present invention, a blocking film, glass, an adhesive layer, and a surface film are included in sequence. The aforementioned OLED display element has a structure consisting of an anode electrode, a light-emitting layer, and a cathode electrode stacked sequentially. Between the anode and cathode electrodes, in addition to the light-emitting layer, there are also a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer. Furthermore, for example, reference can be made to Japanese Patent Application Publication No. 2014-132522. Resin film can also be used to replace the glass mentioned above.

[0240] <Adhesive layer> In the OLED display device of the present invention, the surface of the filter or the OLED display element of the present invention on the side facing the external light source can be bonded to glass, a blocking film, an optical functional film having an anti-reflective layer, or a polarizer including a polarizer and a polarizer protective film via an adhesive layer. Furthermore, the surface of the filter or the OLED display element of the present invention located on the side opposite to the external light source is preferably bonded to glass (substrate), a blocking film, or a layer containing TFTs via an adhesive layer. Furthermore, when the OLED display element of the present invention has an adhesive layer on its outermost surface, the description of the adhesive layer can be replaced with a description relating to the adhesive layer on the outermost surface of the OLED display element of the present invention. As the aforementioned adhesive layer, the descriptions relating to the adhesive layer and formation method in an OLED display device as disclosed in International Publication No. 2021 / 132674,

[0239] to

[0290] , can be directly applied. Furthermore, from the viewpoint of the light resistance of the filter and the filter contained in the OLED display element of the present invention, the adhesive composition described in International Publication No. 2021 / 132674 preferably contains the ultraviolet absorber described later.

[0241] <Substrate> In the OLED display device of the present invention, the filter or OLED display element of the present invention can be bonded to the optical functional film via an adhesive layer on the surface located on the side facing external light. Furthermore, the filter or OLED display element of the present invention is preferably bonded to the glass (substrate) via an adhesive layer on the surface located on the side opposite to external light.

[0242] The method for forming the adhesive layer is not particularly limited. For example, the following methods can be used: applying the adhesive composition to the light absorption filter, the filter, or the OLED display element of the present invention using a conventional method such as a bar coater, and then drying and curing it; or first applying the adhesive composition to the surface of a release substrate and drying it, then using the release substrate to transfer the adhesive layer to the light absorption filter, the filter, or the OLED display element of the present invention, and then allowing it to mature and cure. As a peelable substrate, there are no particular limitations, and any peelable substrate can be used, such as the support film in the manufacturing method of the light absorption filter of the present invention described above. In addition, the conditions for coating, drying, curing and hardening can be appropriately adjusted according to conventional methods.

[0243] [Inorganic electroluminescent display device] The inorganic electroluminescent display device of the present invention (referred to as an inorganic EL (electroluminescence) display device, and also simply as an inorganic EL display device in this invention) includes the filter of the present invention or the inorganic electroluminescent display element of the present invention. Furthermore, the inorganic EL display element of the present invention is assembled into the inorganic EL display device of the present invention such that the filter of the present invention is on the external light side. As for the inorganic EL display device of the present invention, as long as it includes the filter of the present invention or the inorganic EL display element of the present invention, the structure of commonly used inorganic EL display devices can be used without particular limitation as other structures. For example, the inorganic EL element (inorganic EL display element) and inorganic electroluminescent display device described in Japanese Patent Application Publication No. 2005-338640 can be preferably applied.

[0244] [Liquid Crystal Display Device] The liquid crystal display device of the present invention includes the filter of the present invention or the liquid crystal display element of the present invention. Furthermore, the liquid crystal display element of the present invention is assembled into the liquid crystal display device of the present invention such that the filter of the present invention is on the external light side. As described later, the filter of the present invention can be used as at least one of the polarizing protective film and the adhesive layer, and can also be included in the backlight unit used in a liquid crystal display device.

[0245] In the case where the liquid crystal display device of the present invention includes the filter of the present invention, it preferably includes the filter of the present invention, a polarizer including a polarizer and a polarizer protective film, an adhesive layer, and a liquid crystal cell, and preferably the polarizer is bonded to the liquid crystal cell via the adhesive layer. In this liquid crystal display device, the filter of the present invention can also serve as a polarizer protective film or an adhesive layer. That is, the liquid crystal display device is divided into the following cases: having a polarizer including a polarizer and the filter (polarizer protective film) of the present invention, an adhesive layer, and a liquid crystal cell; and having a polarizer including a polarizer and a polarizer protective film, the filter (adhesive layer) of the present invention, and a liquid crystal cell.

[0246] Figure 1 This is a schematic diagram illustrating an example of the liquid crystal display device of the present invention. Figure 1 The liquid crystal display device 10 includes a liquid crystal cell having a liquid crystal layer 5 and an upper electrode substrate 3 and a lower electrode substrate 6 disposed above and below it, as well as an upper polarizer 1 and a lower polarizer 8 disposed on both sides of the liquid crystal cell. A color filter layer may be stacked on the upper electrode substrate 3 or the lower electrode substrate 6. A backlight is disposed on the back side of the liquid crystal display device 10. The light source described in the backlight unit can be used as the backlight source.

[0247] The upper polarizer 1 and the lower polarizer 8 each have a structure formed by stacking the polarizer in such a way that the polarizer is held between two polarizer protective films. Preferably, at least one polarizer in the liquid crystal display device 10 is a polarizer that includes the filter of the present invention. Furthermore, in the liquid crystal display device 10, the aforementioned liquid crystal cell and polarizers (upper polarizer 1 and / or lower polarizer 8) can be bonded together via an adhesive layer (not shown). In this case, the filter of the present invention can also serve as the aforementioned adhesive layer. The liquid crystal display device 10 includes image direct viewing type, image projection type, and light modulation type. Active matrix liquid crystal display devices using three-terminal or two-terminal semiconductor elements such as TFT (Thin Film Transistor) or MIM (Metal Insulator Metal) are effective for this invention. Of course, passive matrix liquid crystal display devices, represented by the STN (Super Twisted Nematic) mode known as time-division driving, are also effective. When the filter of the present invention is included in the backlight unit, the polarizer of the liquid crystal display device can be a conventional polarizer (excluding the polarizer of the filter of the present invention) or a polarizer including the filter of the present invention. Furthermore, the adhesive layer can be a conventional adhesive layer (not the filter of the present invention) or an adhesive layer based on the filter of the present invention.

[0248] The IPS (In-Plane Switching) liquid crystal display device described in paragraphs 0128 to 0136 of Japanese Patent Application Publication No. 2010-102296 is preferably used as the liquid crystal display device of the present invention, in addition to preferably using the filter of the present invention.

[0249] <Polarizing plate> The polarizer used in this invention includes a polarizer and at least one polarizer protective film. The polarizer used in this invention preferably has a polarizer and polarizer protective films located on both sides of the polarizer, and preferably includes the filter of this invention as a polarizer protective film on at least one side. In this case, a general polarizer protective film can be provided on the side of the polarizer opposite to the side having the filter of this invention (polarizer protective film of this invention). The thickness of the polarizer protective film is preferably 5 to 120 μm, more preferably 10 to 100 μm. A thinner film is less likely to cause display unevenness after high temperature and humidity periods when mounted in a liquid crystal display device, and is therefore preferred. On the other hand, from the viewpoint of stable transport during film manufacturing and polarizer fabrication, a thicker film is preferred. In the case where the filter of the present invention also serves as a polarizer protective film, the thickness of the filter preferably meets the above-mentioned range. As the polarizer used in this invention, the descriptions in International Publication No. 2021 / 132674

[0299] to

[0309] concerning the performance, shape, structure, polarizer, method of laminating the polarizer and the protective film of the polarizer, and functionalization of the polarizer can be directly applied.

[0250] <Adhesive layer> In the liquid crystal display device of the present invention, the polarizer is preferably bonded to the liquid crystal cell via an adhesive layer. The filter of the present invention can also serve as the adhesive layer. If the filter of the present invention does not also serve as an adhesive layer, a conventional adhesive layer can be used. As an adhesive layer, there are no particular limitations as long as it can adhere to the polarizer and the liquid crystal cell. For example, acrylic, urethane, and polyisobutylene are preferred. In the case where the filter of the present invention also functions as an adhesive layer, the wavelength-selective absorption layer and the light-absorption-disappearing layer of the filter of the present invention, in addition to the components contained in their respective layers (the aforementioned resin and dye in the wavelength-selective absorption layer of the filter of the present invention, and the aforementioned resin and dye in the light-absorption-disappearing layer of the filter of the present invention), also contain the aforementioned base polymer, and further contain crosslinking agents, coupling agents, etc., to impart adhesiveness. Furthermore, the resin in the wavelength-selective absorption layer of the filter of the present invention and the resin in the light-absorption-disappearing layer of the filter of the present invention, which functions as a base polymer in the adhesive layer, can be used in a form that also functions as a base polymer. When the filter of the present invention also functions as an adhesive layer, the adhesive layer (the wavelength-selective absorption layer in the filter of the present invention and the light absorption-disappearing layer in the filter of the present invention) preferably contains 90% by mass or more and less than 100% by mass of the aforementioned basic polymer, and more preferably contains 95% by mass or more and less than 100% by mass of the aforementioned basic polymer. The dye content is as described above. The thickness of the adhesive layer is not particularly limited, but is preferably 1 to 50 μm, and more preferably 3 to 30 μm.

[0251] <Liquid Crystal Unit (Liquid Crystal Display Element)> The liquid crystal cell is not particularly limited and can be a common liquid crystal cell.

[0252] In the case where the liquid crystal display device of the present invention includes the liquid crystal display element of the present invention, in the above description of the liquid crystal display device, the liquid crystal display element of the present invention is used as a liquid crystal cell; otherwise, the structure of a conventional liquid crystal display device can be used.

[0253] <Ultraviolet Absorption Layer> In organic electroluminescent display devices, inorganic electroluminescent display devices, and liquid crystal display devices of the present invention, including the filter or display element of the present invention, a layer (hereinafter also referred to as "ultraviolet absorption layer") is preferably provided on the observer side relative to the filter or display element of the present invention to prevent light absorption (ultraviolet absorption) of compounds that generate free radicals through ultraviolet irradiation. By providing the ultraviolet absorption layer, fading of the filter or display element of the present invention contained in the filter of the present invention caused by external light can be prevented. The ultraviolet absorbing layer used in this invention will be described below.

[0254] (UV absorber) The aforementioned ultraviolet-absorbing layer typically contains resin and ultraviolet absorber. Specific examples of ultraviolet absorbers preferred for use in this invention include hindered phenolic compounds, benzophenone compounds such as hydroxybenzophenone compounds, benzotriazole compounds, salicylates, cyanoacrylates, nickel complex salts, etc. As examples of hindered phenolic compounds and benzotriazole compounds, the hindered phenolic compounds and benzotriazole compounds described in paragraph

[0227] of International Publication No. 2023 / 234353 can also be preferably used in the present invention. The amount of these UV absorbers added is preferably 0.1 to 30.0 parts by weight relative to 100 parts by weight of the resin.

[0255] Furthermore, from the viewpoint of further improving the light resistance of the filter of the present invention or the filter of the present invention contained in the display element of the present invention, it is also preferable to use the compound (1) represented by formula (1) as described in paragraphs

[0229] to

[0283] of International Publication No. 2023 / 234353 as the ultraviolet absorber. Regarding the absorption characteristics, synthesis method and content of the compound (1) represented by formula (1) as described in International Publication No. 2023 / 234353, the description in paragraphs

[0279] to

[0283] of International Publication No. 2023 / 234353 can also be preferably used in the present invention.

[0256] [Resin] As the resin used in the aforementioned ultraviolet absorbing layer, any known resin can be used, and there are no particular limitations as long as it does not depart from the spirit of the present invention. Examples of such resins include cellulose acylated resins, acrylic resins, cycloolefin resins, polyester resins, and epoxy resins.

[0257] (Location of the ultraviolet absorption layer) The configuration of the aforementioned ultraviolet absorbing layer is not particularly limited as long as it is on the observer side relative to the filter or display element of the present invention, and can be disposed in any position. For example, an ultraviolet absorber can be added to components such as the protective film or anti-reflective film of the polarizer to give it the function of an ultraviolet absorbing layer. Furthermore, an ultraviolet absorber can also be added to the aforementioned adhesive layer. Example

[0258] The present invention will now be described in further detail with reference to embodiments. The materials, amounts, proportions, processing contents, and processing steps shown in the following embodiments can be appropriately modified without departing from the spirit of the invention. Therefore, the scope of the present invention is not limited to the embodiments shown below. In addition, in the following embodiments, unless otherwise specified, the "parts" and "%" of the composition refer to the mass basis. Room temperature refers to "25°C". In addition, all processes, from the preparation of the light absorption vanishing layer forming liquid to the fabrication of the light absorption filter using the light absorption vanishing layer forming liquid and the ultraviolet irradiation test, are carried out under yellow light to avoid ultraviolet irradiation. λ max The value was determined using the method described in the section on "Absorbance of the Optical Absorption Filter (Before Ultraviolet Irradiation)" (described later).

[0259] [Fabrication of an optical absorption filter] The following shows the materials used to make optical absorption filters. <Polymer (Resin)> (Resin 1) ARUFON UC-3920 (trade name) manufactured by TOAGOSEI CO., LTD. is a carboxyl-containing acrylic polymer with a weight-average molecular weight of 15,500. (Resin 2) Adamantyl methacrylate-acrylic acid random copolymer, with an acrylic acid content of 52 mol%, and a weight average molecular weight of 46,300. Furthermore, the acrylic acid-derived structural unit of resin 2 corresponds to the carboxyl group as an acid group in compound A as specified in this invention.

[0260] <Compound B> 4-Methylquinoline (manufactured by Tokyo Chemical Industry Co., Ltd., Lepidine, pKaH5.1)

[0261] <Dyes> In the following structural formula, Bu represents butyl.

[0262] (The dye contained in the light-absorbing and disappearing layer) [Chemical Formula 22]

[0263] (The dye contained in the wavelength-selective absorption layer) [Chemical Formula 23]

[0264] (Leveling agent 1) A polymeric surfactant composed of the following components was used as leveling agent 1. In the following structural formulas, the proportions of each structural component are molar ratios, and t-Bu represents tert-butyl.

[0265] [Chemical Formula 24]

[0266] (Substrate 1) A polyethylene terephthalate film, Lumirror XD-510P (trade name, 50 μm thick, manufactured by TORAYINDUSTRIES, INC.), was used as substrate 1.

[0267] Example 1 Fabrication of Optical Absorption Filter No. 101 with Gas Barrier Layer Fabrication of a wavelength-selective absorption layer (1) Preparation of wavelength-selective absorption layer forming liquid 1 The components were mixed in the manner shown below to prepare wavelength-selective absorption layer forming liquid 1. ―――――――――――――――――――――――――――――――― Composition of wavelength-selective absorption layer forming liquid 1 ―――――――――――――――――――――――――――――――― Resin 1 93.21 parts by weight Leveling agent 1 0.08 parts by weight Dye E-42 2.50 parts by weight Dye 7-23 1.57 parts by weight Dye C-122 0.66 parts by weight Dye G-2 1.98 parts by weight Tetrahydrofuran (solvent) 566.7 parts by weight ――――――――――――――――――――――――――――――――

[0268] Next, the obtained wavelength selective absorption layer forming liquid 1 was filtered using a filter with an absolute filtration accuracy of 5 μm (trade name: Hydrohobic Fluorepore Membrane, manufactured by Millex).

[0269] (2) Fabrication of wavelength-selective absorption layer 1 The wavelength selective absorption layer forming liquid 1 after filtration was applied to the substrate 1 using a bar coater to achieve a film thickness of 2.4 μm after drying, and then dried at 120°C to produce a substrate 2 with a wavelength selective absorption layer.

[0270] <Fabrication of substrate 3 with diffusion inhibition layer>

[0271] (1) Preparation of diffusion inhibition layer forming liquid A The components were mixed according to the composition shown below and stirred in a constant temperature bath at 50°C for 1 hour to dissolve poly(methacrylic acid) (manufactured by FUJIFILM Wako Pure Chemical Corporation, weight average molecular weight 100,000, δt value = 19.0) to prepare diffusion inhibition layer forming liquid A. ―――――――――――――――――――――――――――――――― Composition of diffusion inhibition layer forming liquid A ―――――――――――――――――――――――――――――――― Poly(methacrylic acid) (manufactured by FUJIFILM Wako Pure Chemical Corporation, weight average molecular weight 100,000) 4.0 parts by weight 60.0 parts by weight of pure water 36.0 parts by weight of ethanol ――――――――――――――――――――――――――――――――

[0272] Next, the obtained diffusion inhibition layer forming liquid A was filtered using a filter with an absolute filtration accuracy of 5 μm (trade name: Hydrohobic Fluorepore Membrane, manufactured by Millex).

[0273] (2) Fabrication of diffusion inhibition layer The diffusion inhibition layer forming liquid A after filtration was applied to the wavelength selective absorption layer of the substrate 2 with the wavelength selective absorption layer using a bar coater, so that the film thickness after drying reaches 1.1 μm, and then dried at 120°C for 60 seconds, thereby producing the substrate 3 with the diffusion inhibition layer.

[0274] <Fabrication of an Optical Absorption Filter>

[0275] (1) Preparation of light absorption disappearance layer forming liquid The components were mixed as shown below to prepare a light-absorbing vanishing layer forming liquid (composition) Ba-1. ―――――――――――――――――――――――――――――――― Composition of Ba-1, a liquid that forms a light-absorbing and disappearing layer. ―――――――――――――――――――――――――――――――― Resin 2 76.8 parts by weight Leveling agent 1 0.08 parts by weight Dye B-18 3.13 parts by weight Dye D-1 1.22 parts by weight Dye D-6 2.03 parts by weight 4-Methylquinoline (manufactured by Tokyo Chemical Industry Co., Ltd.) 17.2 parts by weight Tetrahydrofuran (solvent, δt value = 23.6) 566.7 parts by mass ――――――――――――――――――――――――――――――――

[0276] Next, the light absorption disappearance layer forming liquid Ba-1 obtained was filtered using filter paper (#63, manufactured by ADVANTEC TOYO KAISHA, LTD.) with an absolute filtration accuracy of 10 μm, and further filtered using a metal sintered filter (trade name: Pall Filter PMF, media code: FH025, manufactured by Pall Corporation) with an absolute filtration accuracy of 2.5 μm.

[0277] (2) Fabrication of optical absorption filter The light absorption vanishing layer forming liquid Ba-1 after the above filtration treatment was applied to the diffusion inhibition layer of the substrate 3 with the diffusion inhibition layer using a bar coater, so that the film thickness after drying reaches 2.2 μm, and then dried at 120°C to form the light absorption vanishing layer, thereby producing a light absorption filter No.101 without a gas barrier layer.

[0278] Fabrication of an optical absorption filter with a gas barrier layer Regarding the light absorption filter No. 101 without a gas barrier layer, a light absorption filter No. 101 (also known as "light absorption filter No. 101 with a gas barrier layer") was fabricated by further stacking a gas barrier layer on the light absorption vanishing layer of the light absorption filter, and its evaluation is described below.

[0279] (1) Preparation of resin solution The components were set to the composition ratio shown below. KURARAY EXCEVAL AQ-4105 (trade name, manufactured by Kuraray Co., Ltd., modified polyvinyl alcohol, saponification degree of 98-99 mol%) was dissolved in pure water and isopropanol and stirred in a constant temperature bath at 90°C for 1 hour. After cooling to room temperature, polyethyleneimine (manufactured by FUJIFILM WakoPure Chemical Corporation, weight average molecular weight of about 10,000) was added to prepare the barrier layer forming liquid. ―――――――――――――――――――――――――――――――― Composition of the gas barrier layer forming liquid ―――――――――――――――――――――――――――――――― KURARAY EXCEVAL AQ-4105 (Product name, manufactured by Kuraray Co., Ltd.) 3.6 parts by weight Polyethyleneimine (manufactured by FUJIFILM Wako Pure Chemical Corporation, weight average molecular weight approximately 10,000) 0.4 parts by weight 88.5 parts by weight of pure water 7.5 parts by weight of isopropanol ――――――――――――――――――――――――――――――――

[0280] Next, the obtained barrier layer forming liquid was filtered using a filter with an absolute filtration accuracy of 5 μm (trade name: Hydrohobic Fluorepore Membrane, manufactured by Millex).

[0281] (2) Stacking of gas barrier layers The gas barrier layer forming liquid after the above filtration treatment was coated onto the light absorption disappearance layer side of the light absorption filter using a bar coater, so that the film thickness after drying reaches 0.6 μm, and then dried at 120°C for 60 seconds, thereby fabricating the light absorption filter No.101 with a gas barrier layer. The light absorption filter No. 101 with the gas barrier layer has a structure in which a substrate 1, a wavelength selective absorption layer, a diffusion suppression layer, a light absorption disappearance layer and a gas barrier layer are stacked in sequence.

[0282] Fabrication of Optical Absorption Filter No. 102 with Gas Barrier Layer In the fabrication of the light absorption filter No. 101 with a gas barrier layer, the thickness of the light absorption vanishing layer was changed to the value recorded in Table 1. Otherwise, the light absorption filter No. 102 with a gas barrier layer was fabricated in the same manner as the fabrication of the light absorption filter No. 101 with a gas barrier layer.

[0283] Fabrication of Optical Absorption Filter No.r301 with Gas Barrier Layer In the fabrication of the light absorption filter No. 101 with a gas barrier layer, except that dyes E-42, 7-23, C-122 and G-2 were removed in the wavelength selective absorption layer forming solution, and dyes B-18, D-1 and D-6 and 4-methylquinoline were removed in the light absorption vanishing layer forming solution, the light absorption filter No. r301 with a gas barrier layer was fabricated in the same manner as the fabrication of the light absorption filter No. 101 with a gas barrier layer.

[0284] Fabrication of optical absorption filters No. C201, C202, and C204 with gas barrier layers In the fabrication of light absorption filter No. 101 with a gas barrier layer, dyes B-18, D-1, and D-6 were removed from the light absorption disappearance layer forming solution. In light absorption filter No. c202 with a gas barrier layer, the thickness of the wavelength selective absorption layer was further changed to the values ​​recorded in Table 1. In light absorption filter No. c204 with a gas barrier layer, the amount of dye in the wavelength selective absorption layer was further changed to the values ​​recorded in Table 1. Otherwise, light absorption filters No. c201, c202, and c204 with gas barrier layers were fabricated in the same manner as light absorption filter No. 101 with a gas barrier layer. In addition, in the fabrication of the wavelength selective absorption layer of the light absorption filter No. c204 with a gas barrier layer, while keeping the amount of leveling agent 1 in the wavelength selective absorption layer of the light absorption filter No. 101 with a gas barrier layer fixed, the amount of resin 1 was adjusted according to the change in the amount of dye in order to keep the quality of the wavelength selective absorption layer unchanged.

[0285] Fabrication of Optical Absorption Filter No. c203 with Gas Barrier Layer In the fabrication of the light absorption filter No. 101 with a gas barrier layer, dyes E-42, 7-23, C-122 and G-2 were removed in the wavelength selective absorption layer forming solution. Otherwise, the light absorption filter No. c203 with a gas barrier layer was fabricated in the same manner as the fabrication of the light absorption filter No. 101 with a gas barrier layer.

[0286] Here, No. 101 and 102 are optical absorption filters of the present invention with gas barrier layers, No. c201 to c204 are optical absorption filters of comparative examples with gas barrier layers, and No. r301 is a reference optical absorption filter with a gas barrier layer. In addition, in the following description, "optical absorption filter with gas barrier layer" will be abbreviated as "optical absorption filter".

[0287] <Absorbance of the light absorption filter (before ultraviolet irradiation)> (1) Measurement of absorbance Using a UV3600 spectrophotometer (trade name) manufactured by Shimadzu Corporation, the absorbance of the light absorption filter and the standard filter was measured in the wavelength range of 380–800 nm at 1 nm intervals. The standard filters for light absorption filters No. 101, 102 and c201 to c204 have been changed to light absorption filter No. r301, which does not contain dyes or 4-methylquinoline as compound B. (2) Calculation of absorbance Using the absorbance values ​​of the optical absorption filter at each wavelength λnm measured above, Ab x The absorbance Ab(λ) of the light-absorbing filter before ultraviolet irradiation is calculated by using the following formula, based on the absorbance values ​​Ab0(λ) of the standard filter at each wavelength λnm and Ab0(λ) of the standard filter at each wavelength λnm. Ab(λ) = Ab x (λ)-Ab0(λ) Hereinafter, the wavelength exhibiting the maximum absorption Ab(λ) among the wavelengths of the absorbance Ab(λ) of the optical absorption filter in the wavelength region of 400–700 nm is defined as the wavelength of maximum absorption (hereinafter, also simply referred to as "λ"). max ”), which will λ max The absorbance below is set as the absorption maximum (hereinafter, also referred to as "Ab(λ)"). max ) The Ab(λ) of each dye obtained max The chemical structures of the dyes mentioned above are already described.

[0288] [Table 1]

[0289] (Table notes) The amount of dye in the wavelength-selective absorption layer and the light absorption fading layer refers to the amount of dye in 100 parts by mass of the wavelength-selective absorption layer and the amount of dye in 100 parts by mass of the light absorption fading layer, respectively. The units for the thickness of the wavelength-selective absorption layer and the thickness of the light absorption vanishing layer are both μm.

[0290] [Reference Example] In the comparative example of light absorption filter No. c203, in which dyes were added only to the light absorption fading layer, light absorption filters No. r302 to r304 were fabricated with the mixing amounts of each dye changed to the values ​​in Table 2, and the decolorization rates of each dye contained in the light absorption fading layer were evaluated as follows. The results are summarized in Table 2 below.

[0291] (Ultraviolet radiation test) At atmospheric pressure (101.33 kPa), using an ultra-high pressure mercury lamp (manufactured by HOYA Corporation, trade name: UL750), the light absorption filter and the standard filter were irradiated with an illuminance of 100 mW / cm² from the gas barrier layer side (the side opposite to substrate 1) on a hot plate at 45°C. 2 Irradiation dose 2000 mJ / cm 2 Ultraviolet (UV) radiation. The standard filter corresponding to optical absorption filters No. r302 to r304 is optical absorption filter No. r301.

[0292] <Absorbance of the light absorption filter (after ultraviolet irradiation)> Using a light absorption filter irradiated with ultraviolet light and a standard filter, the absorbance Ab(λ) of the light absorption filter irradiated with ultraviolet light was calculated using the same method as described above for <Absorbance of the light absorption filter (before ultraviolet light irradiation)>. In addition, the absorbance Ab(λ) of the light absorption filter before the ultraviolet irradiation test was calculated using the same method as described above for <Absorbance of the light absorption filter (before ultraviolet irradiation)>.

[0293] [1. Evaluation of decolorization rate] The maximum absorbance (Ab(λ)) before and after the above ultraviolet irradiation test max The decolorization rate is calculated using the following formula. Decolorization rate (%) = 100 - (Ab(λ) after UV irradiation) max ) / Ab (λ) before ultraviolet irradiation max ))×100

[0294] [2. Absorption originating from newly colored structures accompanying pigment decomposition (secondary absorption)] In addition, in the light absorption filters No. r302 to r304 of the reference examples, the value obtained by subtracting the ratio of (I) from the ratio of (II) specified in the above

[0223] section is 5.0% or less, and the secondary absorption caused by the decomposition of the dye due to ultraviolet irradiation is suppressed.

[0295] [Table 2]

[0296] (Table notes) The amount of dye in the light-absorbing vanishing layer refers to the mass fraction of dye in 100 parts by mass of the light-absorbing vanishing layer. The thickness of the light absorption vanishing layer is measured in μm.

[0297] As can be seen from the results in Table 2 above, the light absorption filters No. r302 to r304 of the reference examples all exhibit excellent decolorization rates, and there is almost no secondary absorption caused by the decomposition of the dye due to ultraviolet irradiation, demonstrating excellent decolorization performance.

[0298] <Simulation of brightness, reflectivity, and hue> The external light reflection of an OLED display device equipped with the light absorption filter described above was simulated, and the brightness, reflectivity, and hue (a) were calculated. and b ).

[0299] (1) Simulation conditions In the simulation of the reflectivity and reflected hue of external light in an OLED display device, the reflectivity, transmission spectrum, and reflection spectrum of each component are defined as follows. (i) As the reflectance of the OLED substrate, the reflectance spectrum of the substrate was measured by disassembling and peeling off the circular polarizer of a commercially available Apple Inc. iPhone X (trade name). (ii) Regarding the transmission spectrum of the light absorption filter, the spectrum after converting the absorbance Ab(λ) of the light absorption filter before ultraviolet irradiation to transmittance is used as "the transmission spectrum of the part covering the non-display area (the transmission spectrum of the part with high light absorption)", and the spectrum after converting the absorbance Ab(λ) of the light absorption filter after ultraviolet irradiation under the conditions described in the ultraviolet irradiation test in the above <<Reference Example>> to transmittance is used as "the transmission spectrum of the part covering the display area (the transmission spectrum of the part with low light absorption)". (iii) Regarding the emission spectrum of the displayed light, the values ​​were obtained by measuring the emission spectrum of a commercially available iPhone X (trade name) manufactured by Apple Inc. using a spectroradiometer SR-UL1R (trade name, manufactured by Topcon Technohouse Corporation). (iv) Regarding the area ratio of the non-display portion to the display portion of the display device, it is set as non-display portion of display device / display portion of display device = 77 / 23. Therefore, the filter obtained by masking (patterning) ultraviolet light on the light absorption filter is also set as the area ratio between the masked area not exposed to ultraviolet light (the area covering the non-display area, the area with high light absorption) and the unmasked area exposed to ultraviolet light (the area covering the display area, the area with low light absorption) = unexposed area / exposed area = 77 / 23.

[0300] (2) Calculation of reflectance and reflected hue Reflectivity and reflectance hue are calculated by multiplying the reflectance spectra of regions with low and high light absorption by an area ratio. Details are as follows.

[0301] First, the reflectance spectra of regions with low light absorption and regions with high light absorption are obtained as follows: the reflectance of the region with low light absorption is set as R. L Let the reflectivity of the region with high light absorption be R. H Let the transmittance of the region with low light absorption be T. L Let the transmittance of the region with high light absorption be T. H Set the reflectivity of the OLED substrate to R. sub The reflectivity of the outermost air interface is set to 1.5%, and calculations are performed for each wavelength based on the following formula. Additionally, T... L and T H The transmittance values ​​at each wavelength obtained from the transmission spectrum of the aforementioned optical absorption filter were obtained by multiplying 100% by 0.01. R L = (T L ) 2 ×(R) sub -1.5% +1.5% R H = (T H ) 2 ×(R) sub -1.5% +1.5% Next, the area ratio of the region with low light absorption and the region with high light absorption is set as A. L AH The reflectance spectrum of the OLED display device was calculated using the following formula. Additionally, A L and A H The value is obtained by multiplying the 100% mark by 0.01. OLED display device reflectance spectrum = R L ×A L +R H ×A H Based on the reflectance spectrum of the OLED display device calculated above, the reflectance (visibility correction) and a are calculated. and b .

[0302] (3) Calculation of relative brightness The relative brightness when using the light absorption filter described above is calculated as follows. The emission spectrum S(λ) of the display was calculated using the emission spectrum of the iPhone X (trade name) manufactured by Apple Inc. (registered trademark). Furthermore, the spectrum of the absorbance Ab(λ) of the light absorption filter after ultraviolet irradiation under the conditions described in the ultraviolet irradiation test in the above <<Reference Example>> was converted to transmittance and denoted as T(λ). The brightness without using a light absorption filter is calculated by performing visibility correction on the aforementioned emission spectrum S(λ), and this brightness is set to 100. The brightness of the aforementioned emission spectrum S(λ)×T(λ) with a light absorption filter is calculated as the relative brightness relative to the brightness without using the aforementioned light absorption filter.

[0303] <Evaluation of the effect of suppressing brightness reduction> The relative brightness values ​​obtained in the above simulation were used, and the effect of suppressing brightness reduction was evaluated based on the following evaluation criteria. (Evaluation Criteria) A: 50 < relative brightness ≤ 100 B: 40 < relative brightness ≤ 50 C: 0 ≤ Relative brightness ≤ 40

[0304] <Evaluation of the suppression effect of external light reflection> Using the reflectivity values ​​obtained in the above simulation, the rate of reduction in reflectivity was calculated using the following formula, and the suppression effect of external light reflection was evaluated based on the following evaluation criteria. The rate of reduction in reflectivity = (R0 - R1) / R0 × 100% R1: Reflectance when using a dye-containing light absorption filter R0: Reflectance when using a dye-free light absorption filter (No.r301) (Evaluation Criteria) A: 85% < the rate of decrease in reflectivity B: 70% < Reflectance reduction rate ≤ 85% C: 0 ≤ Reflectivity reduction rate ≤ 70%

[0305] <Evaluation of Reflective Tones> Using the a obtained from the above simulation b The reflected hue was evaluated based on the following evaluation criteria. (Evaluation Criteria) and b All are above -5.0 and below 5.0. and b At least one of them is less than -5.0 or greater than 5.0. The results are summarized in Table 3.

[0306] [Table 3]

[0307] As shown in Table 3, the comparative examples of optical absorption filters No. c201, c202, and c204, which contain dye only in the wavelength-selective absorption layer, cannot simultaneously suppress external light reflection and brightness reduction. A comparison of optical absorption filters No. c201 with No. c202 and c204 shows that when dye is only present in the wavelength-selective absorption layer, increasing the dye content or thickening the layer to improve the suppression of external light reflection leads to a worse suppression of brightness reduction. Furthermore, the comparative example of light absorption filter No. c203, which contains dye only in the light absorption fading layer, has poor suppression of external light reflection and cannot simultaneously suppress both external light reflection and brightness reduction. In the case where the dye is only in the light absorption fading layer, the display area is transparent; therefore, in display devices where the area of ​​the display area is high relative to the area of ​​the non-display area, it is impossible to improve the suppression of external light reflection to a sufficient level. In contrast, the light absorption filters No. 101 and No. 102 of the present invention, which contain dyes in both the wavelength selective absorption layer and the light absorption vanishing layer, can achieve a high level of both suppression of external light reflection and suppression of brightness reduction, and can also achieve a neutral reflection tone.

[0308] The invention has been described together with its embodiments, but we believe that, unless otherwise specifically indicated, the invention should not be limited to any of the details described, but should be interpreted broadly without departing from the spirit and scope of the invention as shown in the appended patent claims.

[0309] This application claims priority based on Japanese Patent Application No. 2023-207520 filed in Japan on December 8, 2023 and Japanese Patent Application No. 2024-095400 filed in Japan on June 12, 2024, the contents of which are incorporated herein by reference and are part of the description herein. Symbol Explanation

[0310] 1-Upper polarizer, 2-Direction of absorption axis of upper polarizer, 3-Upper electrode substrate of liquid crystal cell, 4-Orientation control direction of upper substrate, 5-Liquid crystal layer, 6-Lower electrode substrate of liquid crystal cell, 7-Orientation control direction of lower substrate, 8-Lower polarizer, 9-Direction of absorption axis of lower polarizer, B-Backlight unit, 10-Liquid crystal display device.

Claims

1. An optical absorption filter, comprising: A light-absorbing fading layer, comprising a resin, a dye having a main absorption wavelength band in the wavelength range of 400–700 nm, and a compound that generates free radicals upon ultraviolet irradiation; and The wavelength-selective absorption layer contains a resin and a dye with a main absorption wavelength band in the wavelength range of 400–700 nm, and does not contain compounds that generate free radicals when exposed to ultraviolet light.

2. The optical absorption filter according to claim 1, wherein, The compounds contained in the light-absorbing disappearing layer that generate free radicals by ultraviolet irradiation include a combination of compound A and compound B, which have an acid group and are capable of forming hydrogen bonds with the acid group contained in compound A.

3. The optical absorption filter according to claim 2, wherein, The compound A is chemically bonded to the polymer that constitutes the resin contained in the light-absorbing eliminator layer.

4. The optical absorption filter according to claim 1, wherein, In the light-absorbing fading layer, the dye contained in the light-absorbing fading layer undergoes a chemical change and becomes colorless when exposed to ultraviolet light.

5. A filter formed by mask exposure of the light absorption filter of claim 1 by ultraviolet irradiation.

6. An intermediate product for a display element, comprising the light absorption filter of claim 1.

7. A display element, which is formed by mask exposure of an intermediate product of the display element according to claim 6 by ultraviolet irradiation.

8. An organic electroluminescent display device, an inorganic electroluminescent display device, or a liquid crystal display device, comprising the filter of claim 5 or the display element of claim 7.

9. The organic electroluminescent display device, inorganic electroluminescent display device, or liquid crystal display device according to claim 8, wherein, On the observer side relative to the filter of claim 5 or the display element of claim 7, there is a layer that blocks the light absorption of the compound that generates free radicals by ultraviolet irradiation.

10. A method for manufacturing a filter, comprising the following steps: The light-absorbing filter of any one of claims 1 to 4 is exposed to ultraviolet light for mask exposure.

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