Resin composition, hardened film, laminate, and optical filter

Abstract

The present invention provides a resin composition capable of obtaining a laminate having excellent interlayer adhesion and vapor deposition resistance, and a hardened film thereof. The resin composition and the hardened film thereof, and a laminate including the hardened film, and an optical filter including the laminate, the resin composition including a monomer having 1 to 6 (meth)acryloyl groups, a photo-hardening elastic polymer, a photopolymerization initiator, and an organic solvent, the mass ratio of the monomer to the photo-hardening elastic polymer being 95:5 to 70:30.

Description

Technical Field

[0001] This invention relates to a resin composition, a hardened film, a laminate, and an optical filter. Background Technology

[0002] In solid-state imaging devices such as video cameras, digital still cameras, and mobile phones with camera functions, charge-coupled devices (CCDs) or complementary metal-oxide-semiconductor (CMOS) image sensors are used as solid-state imaging elements for color images. These solid-state imaging elements utilize silicon photodiodes (SPDs) in their light-receiving sections, which are sensitive to near-infrared light imperceptible to the human eye. In these solid-state imaging elements, visual sensitivity correction is required to ensure that the acquired image displays natural colors as perceived by the human eye, and optical filters (e.g., near-infrared cutoff filters) are often used to selectively transmit or block light in specific wavelength regions.

[0003] As such near-infrared cutoff filters, filters manufactured using various methods have been used in the past. For example, Patent Document 1 discloses a near-infrared cutoff filter that uses a transparent resin as a substrate and incorporates a polycarboxylic acid intramium compound as a near-infrared absorbing pigment in the transparent resin. This filter has a wide viewing angle and is particularly suitable for use as a visual sensitivity correction filter for solid-state imaging devices such as CCDs and CMOS sensors.

[0004] In addition, Patent Document 2 discloses an optical filter in which a squaric acid lactone compound and a specific compound that absorbs or extinguishes fluorescence generated from the squaric acid lactone compound are used as near-infrared absorbing pigments, thereby resulting in low fluorescence transmission and excellent transmittance characteristics.

[0005] [Existing Technical Documents]

[0006] [Patent Literature]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2012-8532

[0008] [Patent Document 2] International Publication No. 2013 / 054864 Summary of the Invention

[0009] [The problem the invention aims to solve]

[0010] With the improvement of solid-state imaging device performance and quantum yield in recent years, when using optical filters with previous structures, insufficient suppression of fluorescence generated by the optical filters can produce image defects called light spots when shooting around a light source of a specific wavelength, resulting in colors that are different from the actual appearance.

[0011] Furthermore, squaric acid-internium compounds generally have a tendency to fluoresce due to their molecular structure, thus exhibiting fluorescence during light absorption, which can degrade image quality in cameras. Patent Document 2 also investigated optical filters with low fluorescence transmission and excellent transmittance characteristics, but further improvements are needed for optical filters with such characteristics.

[0012] Furthermore, with the improvement in the performance of solid-state imaging components and the expansion of their applications in recent years, the characteristics required for optical filters have become increasingly diverse. Meeting these various requirements for optical filters has led to increased complexity in manufacturing processes and a greater variety of product types. To address these requirements, it is necessary to prepare multiple light-absorbing layers (films) with specific optical properties in advance. These layers are then stacked according to the required characteristics, thereby simplifying the manufacturing process and facilitating product management (quality control).

[0013] To facilitate product management (quality management) and to simplify the manufacturing process of optical filters, it is ideal to include an intermediate layer with specific functions between different optical films when stacking them. This ensures the adhesion of each layer, inhibits the mixing (migration) of various additives such as pigments, and ensures the resistance of vapor deposition.

[0014] One embodiment of the present invention aims to solve the problem of providing a resin composition that yields a laminate with excellent interlayer adhesion and vapor deposition resistance, as well as a cured film thereof.

[0015] In addition, one embodiment of the present invention aims to solve the problem of providing a laminate with excellent interlayer adhesion and vapor deposition resistance, as well as an optical filter.

[0016] [Technical means to solve the problem]

[0017] The inventors conducted diligent research to solve the aforementioned problem and discovered that the problem can be solved according to the following structural example, thus completing the present invention.

[0018] The means to solve the aforementioned problem include the following embodiments.

[0019] <1> A resin composition comprising a monomer having 1 to 6 (meth)acryloyl groups, a photocurable elastic polymer, a photopolymerization initiator, and an organic solvent.

[0020] The mass ratio of the monomer to the photocurable elastic polymer is 95:5 to 70:30.

[0021] <2> According to the resin composition described in <1>, the elongation of the photocurable elastic polymer is 50% to 250% as determined by the American Society for Testing and Materials (ASTM) D638.

[0022] <3> The resin composition according to <1> or <2>, wherein the photocurable elastic polymer is urethane acrylate.

[0023] <4> The resin composition according to any one of <1> to <3>, wherein the monomer is a compound having an alicyclic structure.

[0024] <5> A hardening film formed by hardening a resin composition according to any one of <1> to <4>.

[0025] <6> A laminate comprising: a hardened film according to <5>, and

[0026] A light-absorbing layer is disposed on at least one side of the hardened film.

[0027] <7> An optical filter comprising the laminate according to <6>.

[0028] [The effects of the invention]

[0029] According to one embodiment of the present invention, a resin composition and its hardened film that can obtain a laminate with excellent interlayer adhesion and vapor deposition resistance can be provided.

[0030] In addition, through one embodiment of the present invention, a laminate with excellent interlayer adhesion and vapor deposition resistance, as well as an optical filter, can be provided. Detailed Implementation

[0031] The present invention will now be described in detail. The description of the constituent elements described below is sometimes based on representative embodiments of the present invention, but the present invention is not limited to these embodiments.

[0032] Furthermore, in this specification, the descriptions of numerical ranges such as "A to B" have the same meaning as "A or more and B or less", and A and B are included within the numerical range.

[0033] In this specification, the term "~" indicating a range of values ​​means that the units listed before and after it are the same unless otherwise specified.

[0034] Furthermore, in this specification, the optical properties (e.g., transmittance, reflectance) of wavelengths A nm to B nm refer to the optical properties at a wavelength resolution of 1 nm in the wavelength region above A nm and below B nm.

[0035] In this specification, when referring to the amount of each component in the composition, if there are multiple substances in the composition that correspond to each component, unless otherwise specified, it refers to the total amount of the multiple substances present in the composition.

[0036] In this specification, a combination of two or more preferred forms is a more preferred form.

[0037] In this specification, near-infrared light refers to light with wavelengths of 650 nm to 1700 nm, which are also the wavelengths with low human visual sensitivity in the detection wavelength range of silicon photodiodes, indium gallium arsenide photodiodes, etc.

[0038] In this specification, "(meth)acryloyl" is a term used to encompass both acryloyl and methacryloyl groups.

[0039] [Resin Composition]

[0040] The resin composition of the present invention comprises a monomer having 1 to 6 (meth)acryloyl groups, a photocurable elastic polymer, a photopolymerization initiator, and an organic solvent.

[0041] The mass ratio of the monomer to the photocurable elastic polymer is 95:5 to 70:30.

[0042] The resin composition of the present invention, having the aforementioned structure, can produce a laminate with excellent interlayer adhesion and vapor deposition resistance.

[0043] The components constituting the resin composition are described below.

[0044] <<Monomers having 1 to 6 (meth)acryloyl groups>>

[0045] The monomer having 1 to 6 (meth)acryloyl groups preferably has 2 to 6, more preferably 2 to 4, and even more preferably 2 or 3, and particularly preferably 2 (meth)acryloyl groups. The molecular weight of the monomer having 1 to 6 (meth)acryloyl groups is preferably 50 to 10,000, more preferably 100 to 5,000, and even more preferably 120 to 3,000.

[0046] The monomer having 1 to 6 (meth)acryloyl groups can be an oligomer.

[0047] When the monomer having 1 to 6 (meth)acryloyl groups is an oligomer, its molecular weight is preferably 10,000 or less, more preferably 5,000 or less, and even more preferably 3,000 or less. The lower limit of the molecular weight of the oligomer is usually 1,000 or more.

[0048] In addition, there is no particular limitation on the number of repeating units in the oligomer, but it is preferably around 2 to 500.

[0049] In addition, monomers having 1 to 6 (meth)acryloyl groups preferably have a cyclic structure.

[0050] The ring structure can be either an alicyclic structure or an aromatic ring structure.

[0051] Alicyclic structures can be any structure of hydrocarbon rings and heterocycles, or ring structures formed by the condensation of these.

[0052] In an alicyclic structure, the alicyclic ring can be either a saturated ring or an unsaturated ring. Among these, a saturated ring is preferred as an alicyclic ring.

[0053] A saturated ring can be a saturated hydrocarbon ring or a saturated heterocycle that, in addition to carbon atoms, also has heteroatoms such as oxygen, nitrogen, and sulfur atoms as ring-forming atoms.

[0054] The saturated hydrocarbon ring can be a monocyclic or polycyclic ring. Polycyclic rings can be condensed rings, cross-linked rings, or spirocyclic rings.

[0055] The carbon number of the saturated ring is preferably a saturated hydrocarbon ring or a saturated heterocycle with 3 to 18 carbons, and more preferably a saturated hydrocarbon ring with 5 to 16 carbons.

[0056] Examples of saturated rings include: monocyclic alkane rings such as cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, cyclononane, cyclodecane, cycloundecane, and cyclododecane; bicyclic saturated hydrocarbon rings such as [2.2.1]heptane (norbornene), [4.4.0]decane (decahydronaphthalene), [5.3.0]decane, [4.3.0]nonane (hexahydroindane), [3.2.1]octane, [5.4.0]undecane, [3.3.0]octane, and [3.3.1]nonane; and tricyclic saturated hydrocarbon rings such as [5.2.1.0]... 2,6 Decane ring (tetrahydrodicyclopentadiene ring), tricyclic [3.3.1.1] 3,7 Decane ring (adamantane ring), tricyclic [6.2.1.0] 2,7 Saturated hydrocarbon rings of tricyclic systems such as undecane ring; tetracyclic [6.2.1.1] 3,6 .0 2,7[Dodecane ring and other tetracyclic saturated hydrocarbon rings; pentacyclic rings [9.2.1.1]] 4 ,7 .0 2,1 0.0 3,8 Pentadecane ring, pentacyclic ring [6.5.1.1] 3,6 .0 2,7 .0 9,13 Pentadecane ring (tetrahydrotricyclopentadiene ring) and other pentacyclic saturated hydrocarbon rings;

[0057] Saturated heterocycles of monocyclic systems, including pyrrolidine ring, pyrazolidine ring, imidazoline ring, tetrahydrofuran ring, 1,3-dioxane ring, piperidine ring, piperazine ring, tetrahydropyran ring, 1,3-dioxane ring, 1,4-dioxane ring, thiane ring, 1,3-disulfide cyclopentane ring, 1,4-disulfide cyclopentane ring, morpholine ring, thiomorpholine ring, and oxazolidine ring; saturated heterocycles of bicyclic systems, including 7-oxabicyclic [4.1.0]heptane ring (1,2-epoxycyclohexane ring), 1-azabicyclic [2.2.2]octane (quinuclidine ring), decahydroquinoline ring, and decahydroisoquinoline ring; and 1-azatricyclic [3.3.1.1]... 3,7 Decane (1-azaadamantane ring), 2-azatricyclic [3.3.1.1] 3,7 Saturated heterocycles such as decane (2-azaadamantane ring) and other tricyclic systems.

[0058] Among these, monomers having 1 to 6 (meth)acryloyl groups are preferably compounds having an alicyclic structure, more preferably compounds having a saturated hydrocarbon ring or a saturated heterocycle, and even more preferably compounds having a saturated hydrocarbon ring or a saturated heterocycle with 3 to 18 carbon atoms, particularly preferably compounds having a saturated hydrocarbon ring with 5 to 16 carbon atoms, and most preferably compounds having a tricyclic decane ring, an isobornane ring, or an adamantane ring.

[0059] Aromatic rings can be any type of aromatic hydrocarbon ring or heterocycle. Examples of heteroatoms in heterocycles include oxygen, nitrogen, and sulfur atoms.

[0060] Aromatic rings can be monocyclic or polycyclic. Polycyclic rings can be condensation rings. Examples of rings formed by the condensation of aromatic and aliphatic rings include benzopyran rings and indole rings.

[0061] The number of ring elements in the aromatic ring is preferably 5 to 14, more preferably 5 to 8.

[0062] Examples of aromatic rings include benzene rings, naphthalene rings, phenanthrene rings, and anthracene rings. Among these, benzene rings are preferred as aromatic rings.

[0063] Monomers having 1 to 6 (meth)acryloyl groups can also be monomers formed by bonding a non-cyclic aliphatic group with a (meth)acryloyl group.

[0064] Aliphatic groups without ring structures can be either saturated or unsaturated. Furthermore, aliphatic groups can be chain-like or branched. Aliphatic groups can contain heteroatoms such as nitrogen, oxygen, and sulfur.

[0065] The aliphatic group preferably has 1 to 30 carbon atoms, more preferably 1 to 20, and even more preferably 1 to 15.

[0066] As an aliphatic group without a ring structure, it is preferably a saturated aliphatic group, more preferably a saturated hydrocarbon group, and even more preferably a saturated hydrocarbon group with 1 to 15 carbon atoms.

[0067] Examples of saturated hydrocarbon groups with 2 to 15 carbon atoms include: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl, lauryl, n-tridecyl, n-tetradecyl, isopentyl, neopentyl, 2-methylpentyl, 2-methylhexyl, 2-ethylpentyl, 3-ethylpentyl, isooctyl, 2-ethylhexyl, 3-ethylhexyl, isononyl, 2-ethyloctyl, isodecyl, isododecyl, isotridecyl, isotetradecyl, etc.

[0068] Aliphatic groups without ring structures are preferably groups composed of saturated hydrocarbon groups and ether bonds.

[0069] There are no particular limitations on monomers having one (meth)acryloyl group. Examples include: alkyl (meth)acrylates with 4 to 16 carbon atoms in the form of chains or branches; β-carboxyalkyl (meth)acrylates with 2 to 14 carbon atoms; alkylated phenyl (meth)acrylates with 2 to 14 carbon atoms; cyclic alkyl (meth)acrylates such as cyclohexyl (meth)acrylate, tricyclodecyl (meth)acrylate, and isobornyl (meth)acrylate; heterocyclic (meth)acrylates such as N-(meth)acryloylmorpholine; and (meth)acrylamide.

[0070] Examples of polyfunctional acrylates having two (meth)acryloyl groups include: 1,3-butanediol di(meth)acrylate; 1,3-butanediol (meth)acrylate; 1,6-hexanediol di(meth)acrylate; ethylene glycol di(meth)acrylate; diethylene glycol di(meth)acrylate; neopentyl glycol di(meth)acrylate; triethylene glycol di(meth)acrylate; tetraethylene glycol di(meth)acrylate; polyethylene glycol di(meth)acrylate; bis((meth)acryloyloxyethyl) ether of bisphenol A; ethoxylated bisphenol A di(meth)acrylate; propoxylated neopentyl glycol di(meth)acrylate; ethoxylated neopentyl glycol di(meth)acrylate, 3-methylpentyl glycol di(meth)acrylate, tricyclodecanediethanol di(meth)acrylate, etc.

[0071] Examples of polyfunctional acrylates having 3 to 6 (meth)acryloyl groups include: trimethylolpropane tri(meth)acrylate; pentaerythritol tri(meth)acrylate; tri(2-hydroxyethyl)isocyanurate tri(meth)acrylate; ethoxylated trimethylolpropane tri(meth)acrylate; propoxylated trimethylolpropane tri(meth)acrylate; pentaerythritol tetra(meth)acrylate; dipentaerythritol penta(meth)acrylate; dipentaerythritol hexa(meth)acrylate; tripentaerythritol tetra(meth)acrylate; tripentaerythritol penta(meth)acrylate; tripentaerythritol hexa(meth)acrylate;

[0072] The reaction products of pentaerythritol tri(meth)acrylate with acid anhydride; the reaction products of dipentaerythritol penta(meth)acrylate with acid anhydride;

[0073] Caprolactone-modified trimethylolpropane tri(meth)acrylate; caprolactone-modified pentaerythritol tri(meth)acrylate; caprolactone-modified tri(2-hydroxyethyl)isocyanurate tri(meth)acrylate; caprolactone-modified pentaerythritol tetra(meth)acrylate; caprolactone-modified dipentaerythritol penta(meth)acrylate; caprolactone-modified dipentaerythritol hexa(meth)acrylate; caprolactone-modified tripentaerythritol tetra(meth)acrylate; caprolactone-modified tripentaerythritol penta(meth)acrylate; caprolactone-modified tripentaerythritol hexa(meth)acrylate; reaction products of caprolactone-modified dipentaerythritol penta(meth)acrylate and acid anhydrides, etc.

[0074] Among these, monomers having 1 to 6 (meth)acryloyl groups are preferably cyclohexyl (meth)acrylate, tricyclodecanediethanol diacrylate, hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), hexanedioldiacrylate (HDDA), tripropylene glycol diacrylate (TPGDA), ethylene glycol diacrylate (EGDA), trimethylolpropane triacrylate (TMPTA), trimethylolpropane ethoxy triacrylate (TMPEOTA), glycerine propoxy triacrylate (GPTA), pentaerythritoltetraacrylate (PETA), or dipentaerythritol hexaacrylate (DPHA).

[0075] <<Photocurable Elastic Polymers>>

[0076] There are no particular restrictions on photocurable elastic polymers, as long as they possess both photocurability and elasticity. Photocurable elastic polymers refer to polymers containing functional groups that can undergo cross-linking polymerization under ultraviolet light and possess elasticity.

[0077] In this specification, "elastic polymer" means a polymer with an elongation of 10% or more as determined by American Society for Testing and Materials (ASTM) D638. Photocurable elastic polymers, through polymerization with monomers having 1 to 6 (meth)acryloyl groups, can impart flexibility and impact resistance to the resulting layers (e.g., intermediate layers described later).

[0078] Examples of photocurable elastic polymers include polycaprolactone, urethane acrylates, and polyrotaxane.

[0079] The polycaprolactone can be obtained by ring-opening polymerization of caprolactone, and the cured product obtained from the resin composition containing polycaprolactone has better flexibility, impact resistance and durability.

[0080] The polyrotaxane is a compound formed by structurally sandwiching a dumbbell-shaped molecule with a cyclic compound (macrocycle). The dumbbell-shaped molecule comprises a linear molecule and closing groups disposed at both ends of the linear molecule. The linear molecule extends through the interior of the cyclic compound, which can move along the linear molecule and is prevented from detaching by the closing groups.

[0081] According to one embodiment of the present invention, a rotaxane compound may be included, wherein the rotaxane compound comprises: a cyclic compound incorporating a lactone compound having a (meth)acrylate-based compound introduced at its end; a linear molecule extending through the cyclic compound; and blocking groups disposed at both ends of the linear molecule to prevent the cyclic compound from detaching.

[0082] In this case, the cyclic compound can be used without particular limitation as long as it is large enough to penetrate or surround the linear molecule, and may contain functional groups such as hydroxyl, amino, carboxyl, thiol, or aldehyde groups that can react with other polymers or compounds. Specific examples of such cyclic compounds include α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, or mixtures thereof.

[0083] Furthermore, as the linear molecule, compounds with a straight-chain form can be used without major restrictions as long as they have a certain molecular weight, but polyalkylene compounds or polylactone compounds can be used. Specifically, polyoxyalkylene compounds containing alkylene repeating units with 1 to 8 carbon atoms, or polylactone compounds containing lactone repeating units with 3 to 10 carbon atoms, can be used.

[0084] On the other hand, the blocking group can be appropriately adjusted according to the characteristics of the rotaxane compound produced, for example, one or more of the group consisting of dinitrophenyl, cyclodextrin, adamantyl, toluene, fluorescein, and pyrene can be used.

[0085] Cured products obtained from resin compositions containing such polyrotaxane compounds exhibit excellent scratch resistance and can self-heal in the event of scratches or external damage.

[0086] <<Carbamate Acrylates>>

[0087] Among these, urethane acrylate is preferred as a photocurable elastic polymer.

[0088] Carbamate acrylates are oligomer compounds with (meth)acryloyl groups and carbamate bonds.

[0089] Uraffinate acrylates are obtained, for example, by reacting a polyisocyanate compound, a (meth)acrylate having hydroxyl or isocyanate groups, with a polyol compound. Examples of urethane acrylates include: urethane acrylates obtained by reacting a polyol compound with a polyisocyanate compound and then reacting the resulting isocyanate-terminated urethane prepolymer with a hydroxyl-containing (meth)acrylate; or urethane acrylates obtained by reacting a polyol compound with a polyisocyanate compound and then reacting the resulting isocyanate-terminated urethane prepolymer with a (meth)acrylate having an isocyanate group.

[0090] Examples of such polyisocyanate compounds include isophorone diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 1,3-xylene diisocyanate, 1,4-xylene diisocyanate, diphenylmethane-4,4'-diisocyanate, and other diisocyanates.

[0091] Examples of hydroxyl-containing (meth)acrylates include: 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, polyethylene glycol (meth)acrylate, etc.

[0092] Examples of (meth)acrylates having an isocyanate group include, for example, methacryloyloxyethyl isocyanate.

[0093] Examples of polyol compounds include alkylene, polycarbonate, polyester, and polyether types. Specifically, examples include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polycarbonate glycol, polyester glycol, and polyether glycol.

[0094] Carbamate acrylates can be obtained through synthesis or are commercially available. Examples of commercially available carbamate acrylates include: UA-122P and UA-1138P manufactured by Shin-Nakamura Chemical Industry Co., Ltd.; AUP-2301 manufactured by Tokushiki Co., Ltd.; U-680, U-678, U-7605, and U-638 manufactured by Nippon Synthetic Chemical Industry Co., Ltd.; and EBECRY 270 manufactured by Daicel Allnex Co., Ltd.

[0095] The weight average molecular weight (Mw) of the urethane acrylate is preferably 1,000 to 12,000, more preferably 2,500 to 10,000, and even more preferably 4,000 to 8,000.

[0096] The elongation of the photocurable elastic polymer, as measured according to ASTM D638, is preferably 50% to 250%, more preferably 50% to 200%, and even more preferably 80% to 180%.

[0097] Photocurable elastic polymers can be oligomers or polymers.

[0098] In this specification, there is no explicit distinction between oligomers and polymers. However, oligomers refer to compounds with a weight average molecular weight (Mw) preferably of 1,000 or more and 10,000 or less, while polymers refer to compounds with a weight average molecular weight (Mw) preferably of more than 10,000 and less than 600,000.

[0099] The mass ratio of the monomer having 1 to 6 (meth)acryloyl groups to the photocurable elastic polymer is 95:5 to 70:30, preferably 90:10 to 70:30.

[0100] When crosslinking polymerization is carried out with monomers having 1 to 6 (meth)acryloyl groups in the specified ratio to the photocurable elastic polymer within the specified range, a layer can be formed that exhibits sufficient impact resistance while having good physical properties and without degrading optical properties.

[0101] The content of the photocurable elastic polymer is preferably 20 to 79.5 parts by mass, more preferably 20 to 49.5 parts by mass, relative to 100 parts by mass of the total solid content of the monomer having 1 to 6 (meth)acryloyl groups, the photocurable elastic polymer, and the photopolymerization initiator described later.

[0102] Photocurable elastic polymers can be used alone or in combination with two or more.

[0103] <<Photopolymerization Initiator>>

[0104] There are no particular limitations on the photopolymerization initiator, and known photopolymerization initiators can be used. Examples of photopolymerization initiators include: 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methyl-1-propanone, methyl benzoylcarbamate, α,α-dimethoxy-α-phenylacetophenone, 2-benzoyl-2-(dimethylamino)-1-[4-(4-morpholinyl)phenyl]-1-butanone, 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone, (2,4,6-trimethylbenzoyl)-diphenylphosphine oxide, or bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, etc.

[0105] Photopolymerization initiators can be obtained through synthesis or are commercially available products.

[0106] Commercial products that serve as photopolymerization initiators include, for example: Irgacure 184, Irgacure 500, Irgacure 651, Irgacure 369, Irgacure 907, Darocur 1173, Darocur MBF, Irgacure 819, Darocur TPO, Irgacure 907, Esacure KIP100F, etc.

[0107] The content of the photopolymerization initiator is preferably 0.5 to 10 parts by mass relative to 100 parts by mass of the total solid components of the monomer having 1 to 6 (meth)acryloyl groups, the photocurable elastic polymer, and the photopolymerization initiator, and more preferably 1 to 5 parts by mass.

[0108] Photopolymerization initiators can be used alone or in combination with two or more.

[0109] <<Organic Solvents>>

[0110] There are no particular restrictions on the organic solvent; any known organic solvent can be used. Examples of organic solvents include: alcohol-based solvents such as methanol, ethanol, isopropyl alcohol (IPA), and butanol; alkoxy-based solvents such as 2-methoxyethanol, 2-ethoxyethanol, and 1-methoxy-2-propanol; ketone-based solvents such as acetone, methyl ethyl ketone (MEK), methyl isobutyl ketone, methyl propyl ketone, and cyclohexanone; ether-based solvents such as propylene glycol monopropyl ether (PGME), ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, and diethylene glycol-2-ethylhexyl ether; and aromatic solvents such as benzene, toluene, and xylene.

[0111] Organic solvents can be used alone or in combination with two or more.

[0112] The organic solvent is preferably a mixture of methyl ethyl ketone (MEK), isopropanol (IPA), and propylene glycol monomethyl ether (PGME).

[0113] The content of the organic solvent can be appropriately adjusted within a range that does not reduce the physical properties of the resin composition. For example, the resin composition may contain an organic solvent in a mass ratio of about 70:30 to about 99:1 relative to 100 parts by mass of the total solid components of the monomer having 1 to 6 (meth)acryloyl groups, the photocurable elastic polymer, and the photopolymerization initiator.

[0114] <<Other Ingredients>>

[0115] The resin composition may contain, as needed, components other than monomers having 1 to 6 (meth)acryloyl groups, photocurable elastic polymers, photopolymerization initiators, and organic solvents (hereinafter also referred to as "other components"). Examples of other components include, for example, surfactants, anti-yellowing agents, leveling agents, and antifouling agents, as well as additives commonly used in the art to which this invention pertains.

[0116] Examples of surfactants include fluorinated acrylates having one or two (meth)acryloyl groups, fluorinated surfactants, or silicone surfactants. The surfactant may be contained in a dispersed or cross-linked form within the cross-linked copolymer.

[0117] Examples of compounds that can prevent yellowing include benzophenone compounds and benzotriazole compounds.

[0118] The content of other components is not particularly limited as long as it does not impair the effect of the present invention. For example, it is preferably 10 parts by mass or less, more preferably 0.1 parts by mass to 10 parts by mass, relative to 100 parts by mass of the resin composition.

[0119] Other ingredients may be used alone or in combination with two or more.

[0120] From the viewpoint of excellent coatability, the viscosity of the resin composition at a temperature of 25°C is preferably 100 cps to 1,200 cps, more preferably 100 cps to 1,200 cps, even more preferably 150 cps to 1,200 cps, and particularly preferably 300 cps to 1,200 cps.

[0121] [Hardened membrane]

[0122] The curing film of the present invention is formed by curing the resin composition. Since the resin composition of the present invention contains a solvent, the curing film of the present invention is a curing film formed by curing the solid components of the resin composition.

[0123] There are no particular limitations on the method of forming the hardened film. For example, the following methods can be used: after applying the resin composition onto the support described later using a bar coater or the like, at least a portion of the solvent is removed by known methods such as heating and drying, air drying, and vacuum drying, and then the film is hardened by ultraviolet irradiation or the like, thereby forming a hardened film.

[0124] There is no particular limitation on the thickness of the hardened film, but it is preferably 0.5 μm to 10 μm, and more preferably 1 μm to 5 μm.

[0125] The hardened film of the present invention, by being fabricated into the laminate described later, can be used in optical filters. From the viewpoint of excellent adhesion, the hardened film can be suitably used as an intermediate layer disposed between the light-absorbing layer and the support in optical filters.

[0126] [Layered structure]

[0127] The laminate of the present invention includes the hardened film, and a light-absorbing layer disposed on at least one side of the hardened film, preferably including the hardened film, the light-absorbing layer disposed on at least one side of the hardened film, and a support disposed on the other side of the hardened film.

[0128] When the laminate includes a support, the support is preferably disposed on the surface of the hardened film. That is, the laminate preferably includes a support, a hardened film, and a light-absorbing layer in sequence.

[0129] In the laminate, the hardened film may be in contact with the light-absorbing layer described later, or a layer other than the hardened film, the light-absorbing layer described later, the support, and the outer coating (hereinafter sometimes referred to as "other layers") may be disposed between the light-absorbing layer and the hardened film. Furthermore, the position of the other layers is not particularly limited; they may be disposed on top of the light-absorbing layer or the hardened film, and may also be appropriately disposed between the light-absorbing layer, the support, and the outer coating described later.

[0130] Other layers include, for example, adhesive layers, primer layers, anti-reflective layers, etc.

[0131] Examples of suitable resins for forming the adhesive layer include acrylic resins. The acrylic resins forming the adhesive layer can be obtained through synthesis or commercially available products. Examples of commercially available acrylic resins include: ultraviolet (UV) curing acrylic adhesives (trade name: "B-UVOCR", manufactured by ThreeBond Co., Ltd.), urethane crosslinking acrylic adhesives (trade name: "SK Dyne 2980 / Y-75", manufactured by Sogyen Chemical Co., Ltd.), urethane crosslinking acrylic adhesives (trade name: "Oribain BPS6596 / BXX6460", manufactured by Artience Co., Ltd.), and epoxy / amine crosslinking acrylic adhesives (trade name: "Cybinol AT-361", manufactured by Saiden Chemical Co., Ltd.).

[0132] When the laminate includes an adhesive layer, there are no particular restrictions on the location of the adhesive layer. For example, it can be placed between the light-absorbing layer and the hardening film. In the light-absorbing layer, the support, and the outer coating described later, the adhesive layer can also be placed between the layers.

[0133] There is no particular limitation on the number of adhesive layers in a laminate; it can be one layer or two or more layers.

[0134] Furthermore, there are no particular restrictions on the formation conditions of the adhesive layer, and known formation methods can be used to form the adhesive layer.

[0135] The layer structure of the laminate is not particularly limited. Examples include: outer coating / support / hardening film / light absorbing layer / outer coating, outer coating / adhesive layer / light absorbing layer / hardening film / support / outer coating, outer coating / support / adhesive layer / light absorbing layer / hardening film / support / outer coating, etc. However, the present invention is not limited to these layer structures.

[0136] <<Light Absorption Layer>>

[0137] The light-absorbing layer may be, for example, a layer that absorbs light in at least a portion of the wavelength range of the infrared and / or ultraviolet regions, or a layer that has full infrared absorption and ultraviolet absorption.

[0138] A light-absorbing layer typically contains pigments, dyes, etc., which act as infrared and / or ultraviolet absorbers, as well as a transparent resin. It can be used to block light in the near-ultraviolet and / or near-infrared regions, thus exhibiting a narrower transmittance band.

[0139] A laminate may include one or more light-absorbing layers. When a laminate includes two or more light-absorbing layers, the absorption characteristics of each light-absorbing layer may be the same or different.

[0140] The thickness of the light-absorbing layer is preferably 3 μm to 20 μm, and more preferably 5 μm to 10 μm.

[0141] In the laminate, the light-absorbing layer is preferably formed by a light-absorbing layer composition comprising: a polymer 1 containing structural units derived from a compound having a (meth)acryloyl group; a near-infrared absorber; and a solvent.

[0142] Furthermore, even when the laminate of the present invention is laminated with layers such as dielectric multilayer films by means of vapor deposition, it is difficult to produce deterioration caused by heat applied during vapor deposition (i.e., it has excellent vapor deposition resistance), and therefore it can be suitably used in optical filters.

[0143] Furthermore, by using the hardened material of the present invention as an optical filter, it exhibits excellent suppression of light spot generation and the like, and can be suitably used in solid-state imaging elements or solid-state imaging devices that can obtain the desired image.

[0144] Furthermore, in the laminate of the present invention, even when an organic coating for imparting scratch-removing or absorption properties is laminated, it is easy to obtain an optical filter that is not prone to degradation such as solvent cracking during application.

[0145] The following describes the components contained in the composition for forming the light-absorbing layer.

[0146] [Composition for forming a light-absorbing layer]

[0147] The light-absorbing layer is preferably formed by a light-absorbing layer composition comprising: a polymer 1 containing structural units derived from a compound having a (meth)acryloyl group; a near-infrared absorber; and a solvent.

[0148] <<Polymer 1>>

[0149] Polymer 1 preferably comprises structural units derived from compounds having a (meth)acryloyl group, more preferably polymers comprising structural units derived from compounds having a (meth)acryloyl group other than the photocurable elastic polymer (hereinafter, sometimes simply referred to as "compounds having a (meth)acryloyl group").

[0150] [Compounds containing (meth)acryloyl groups]

[0151] Examples of compounds containing a (meth)acryloyl group include: alkyl methacrylates such as (meth)acrylic acid and methyl methacrylate; alicyclic (meth)acrylates such as cyclohexyl methacrylate; aryl methacrylates such as phenyl methacrylate; aralkyl (meth)acrylates such as benzyl methacrylate; alkoxy (poly)alkyl glycol (meth)acrylates; aryloxy (poly)alkyl glycol (meth)acrylates; and cyano-containing (meth)acrylates such as (meth)acrylonitrile.

[0152] From the viewpoints of heat resistance and colorfastness and affinity for near-infrared absorbers, alkyl (meth)acrylates and alicyclic (meth)acrylates are preferred.

[0153] [Compounds with N-substituted maleimide groups]

[0154] Polymer 1 may further comprise structural units derived from compounds having N-substituted maleimide groups.

[0155] Substituents in compounds having an N-substituted maleimide group can be, for example, aliphatic hydrocarbon groups. These aliphatic hydrocarbon groups can be linear, branched, or cyclic, and can be saturated or unsaturated. Among these, alicyclic hydrocarbon groups are preferred as substituents in compounds having an N-substituted maleimide group.

[0156] Examples of alicyclic hydrocarbon groups include alicyclic hydrocarbon groups with 3 to 20 carbon atoms.

[0157] Alicyclic hydrocarbon groups with 3 to 20 carbon atoms can be saturated or unsaturated, and can be monocyclic or polycyclic. Polycyclic hydrocarbons can be cross-linked or spirocyclic.

[0158] There is no particular limitation on the number of ring elements in the alicyclic hydrocarbon group, but it is preferably 3 to 14, more preferably 3 to 8, and even more preferably 3 to 6.

[0159] The alicyclic hydrocarbon group having 3 to 20 carbon atoms is preferably an alicyclic hydrocarbon group having 3 to 14 carbon atoms, more preferably an alicyclic hydrocarbon group having 3 to 12 carbon atoms, and even more preferably an alicyclic alkyl group having 3 to 10 carbon atoms, and particularly preferably an alicyclic alkyl group having 3 to 8 carbon atoms.

[0160] Examples of alicyclic hydrocarbon groups having 3 to 20 carbon atoms include cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl, tert-butylcyclohexyl, cycloheptyl, cyclooctyl, 1-cyclohexenyl, norbornel, adamantyl, etc.

[0161] Among these, the cyclohexyl group is preferred as an alicyclic hydrocarbon group with 3 to 20 carbon atoms.

[0162] Examples of compounds having an N-substituted maleimide group include: N-methylmaleimide, N-ethylmaleimide, N-propylmaleimide, N-isopropylmaleimide, N-tert-butylmaleimide, N-cyclohexylmaleimide, N-octylmaleimide, N-2-ethylhexylmaleimide, N-phenylmaleimide, N-benzylmaleimide, and N-naphthylmaleimide.

[0163] From the viewpoint of excellent heat resistance, N-benzylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide are preferred as compounds having an N-substituted maleimide group. Furthermore, from the viewpoint of excellent heat resistance and colorfastness, N-cyclohexylmaleimide is more preferred as a compound having an N-substituted maleimide group.

[0164] [Other compounds]

[0165] Provided that the effects of the invention are not impaired, polymer 1 may also contain structural units derived from compounds other than those having (meth)acryloyl groups and those having N-substituted maleimide groups (hereinafter also referred to as "other compounds").

[0166] Other compounds include, for example, unsaturated dialkyl dicarboxylic acid esters such as dialkyl maleate; aromatic compounds with vinyl unsaturated double bonds such as styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene or p-methylstyrene, o-methoxystyrene, m-methoxystyrene or p-methoxystyrene.

[0167] Relative to 100% by mass of the structural units derived from compounds having N-substituted maleimide groups and structural units derived from compounds having (meth)acryloyl groups in the polymer, the content of structural units derived from other compounds is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 1% by mass or less.

[0168] Polymer 1 may contain one or more structural units derived from other compounds.

[0169] [Weight-average molecular weight (Mw) of polymer 1]

[0170] The weight-average molecular weight (Mw) of polymer 1, determined by gel permeation chromatography (GPC) and converted from polystyrene, is preferably 50,000 to 1,500,000, more preferably 200,000 to 700,000.

[0171] When the weight average molecular weight of polymer 1 is above 200,000, it exhibits high toughness and superior crack resistance.

[0172] When the weight average molecular weight of polymer 1 is below 700,000, the viscosity of the coating solution will not become too high, and the coating properties are excellent.

[0173] Furthermore, the weight-average molecular weight (Mw) is determined using the measurement methods used in this technical field.

[0174] [Glass transition temperature of polymer 1]

[0175] The glass transition temperature (Tg) of polymer 1 is preferably 130°C to 200°C, more preferably 150°C to 190°C, even more preferably 150°C to 185°C, and particularly preferably 150°C to 170°C.

[0176] If the glass transition temperature (Tg) of polymer 1 is above 130°C, it has excellent heat resistance. In addition, it can suppress the whitening (i.e., appearance deterioration) of optical filters obtained in the vapor deposition process.

[0177] Furthermore, the glass transition temperature (Tg) is determined using a measurement method used in this technical field.

[0178] When polymer 1 is coated on the surface of the support (absorbent layer 2 (resin)) described later, the higher the glass transition temperature (Tg) of the coating, the greater the internal stress, which can sometimes cause warping of the optical filter. From the viewpoint of suppressing optical filter warping, when polymer 1 is coated on the surface of the absorbent layer 2 (resin) described later, the glass transition temperature (Tg) is preferably within the aforementioned temperature range.

[0179] [Mass ratio of compounds having N-substituted maleimide groups to compounds having (meth)acryloyl groups]

[0180] In polymer 1, the mass ratio of structural units derived from compounds having N-substituted maleimide groups to structural units derived from compounds having (meth)acryloyl groups (structural units derived from compounds having N-substituted maleimide groups: structural units derived from compounds having (meth)acryloyl groups) is preferably 90:10 to 30:70, more preferably 60:40 to 40:60, on a mass basis.

[0181] If the content ratio of structural units derived from compounds having N-substituted maleimide groups in polymer 1 is within the range described, the decrease in the glass transition temperature (Tg) of polymer 1 can be suppressed, and an optical filter with excellent heat resistance can be obtained.

[0182] The content of polymer 1 is preferably 5% to 30% by mass, more preferably 8% to 20% by mass, relative to the total mass of the composition for the light absorption layer.

[0183] Polymer 1 can be used alone, or two or more can be used together.

[0184] Near-infrared absorbers

[0185] There are no particular restrictions on near-infrared absorbers; they can be any of inorganic and / or organic compounds.

[0186] As near-infrared absorbers, various known compounds that are used as dyes or pigments can be used, for example.

[0187] Specific examples of near-infrared absorbers include: azo compounds, azomethyl base compounds, azopyridone compounds, pyrazolone azo compounds, indole compounds, anthraquinone compounds, quinoline compounds, coumarin compounds, dipyrrole methylene compounds, pyrrolopyrrole compounds, diketopyrrolopyrrole compounds, diphenylmethane compounds, triarylmethane compounds, xanthones, acridine compounds, polymethine compounds, oxacyanine compounds, anthocyanine compounds, aryl compounds, benzene methylene compounds, anthocyanine compounds, squaric acid lacton compounds, ketone lacton compounds, perylene compounds, dioxazine compounds, phthalocyanine compounds, naphthyl phthalocyanine compounds, porphyrin compounds, tetraazaporphyrin compounds, phthalocyanine compounds, their metal chelates, metal dithiolates, copper complexes, and iron complexes.

[0188] In addition, polymethine compounds are polymethine compounds excluding oxacyanine compounds, anthocyanine compounds, aryl compounds, benzene-methylene compounds, anthocyanine compounds, squaric acid lacton compounds, and ketone lacton compounds, and phthalocyanine compounds are phthalocyanine compounds excluding porphyrin compounds and tetrazaporphyrin compounds.

[0189] Among these, the near-infrared absorber is preferably at least one compound selected from the group consisting of squaric acid-based compounds, phthalocyanine compounds, naphthalene phthalocyanine compounds, ketone-based compounds, and polymethine compounds (excluding squaric acid-based compounds, ketone-based compounds, and anthocyanin compounds), more preferably at least one compound selected from the group consisting of squaric acid-based compounds and polymethine compounds, and even more preferably a polymethine compound.

[0190] The near-infrared absorber preferably has a wavelength of maximum absorption at wavelengths of 650 nm to 900 nm, more preferably 700 nm to 840 nm.

[0191] The structures of specific near-infrared absorbers are described, for example, in the "New Handbook of Dyes" (edited by the Organic Synthetic Chemistry Association; Maruzen, 1970) and the "Pigment Handbook" (edited by Nobuo Okawara et al.; Kodansha, 1986).

[0192] From the viewpoint of superior suppression of fluorescence emission, the content of near-infrared absorber (the total amount when containing two or more near-infrared absorbers) is preferably 1 to 20 parts by mass relative to 100 parts by mass of polymer 1, more preferably 3 to 10 parts by mass.

[0193] Near-infrared absorbers can be used alone or in combination with two or more.

[0194] <<Solvent>>

[0195] There are no particular limitations on the solvent, and known solvents used in the manufacture of optical filters can be listed. Preferably, the solvent is at least one compound selected from the group consisting of ketone compounds having 6 or fewer carbon atoms, ether compounds having 6 or fewer carbon atoms, and alkyl diol monomethyl ether acetate compounds.

[0196] Examples of ketone compounds with 6 or fewer carbon atoms include acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, and cyclohexanone.

[0197] Examples of ether compounds with 6 or fewer carbon atoms include: diethyl ether, tetrahydrofuran, 1,3-dioxane, tetrahydropyran, 4-methyltetrahydropyran, etc.

[0198] Examples of alkyl glycol monomethyl ether acetate compounds include ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, and diethylene glycol monomethyl ether acetate.

[0199] From the viewpoint of excellent solubility and liquid storage stability of polymer 1, the solvent is preferably at least one compound selected from the group consisting of ketone compounds with 6 or fewer carbon atoms and ether compounds with 6 or fewer carbon atoms, more preferably both ketone compounds with 6 or fewer carbon atoms and ether compounds with 6 or fewer carbon atoms. Furthermore, as a combination of ketone compounds with 6 or fewer carbon atoms and ether compounds with 6 or fewer carbon atoms, methyl ethyl ketone and 1,3-dioxane are preferred.

[0200] The solvent content relative to 100 parts by mass of polymer 1 is preferably 200 to 2000 parts by mass, more preferably 500 to 1000 parts by mass.

[0201] Solvents can be used alone or in combination with two or more.

[0202] <<Other Additives>>

[0203] The composition for the light absorption layer may also include the polymer 1, the near-infrared absorber, and compounds other than the solvent (hereinafter sometimes referred to as "other additives").

[0204] Other additives, for example, as leveling agents, include: silicone-based or fluorinated surfactants, silane coupling agents as adhesion promoters when laminated on glass, antioxidants (anti-aging agents), etc.

[0205] Other additives may be used alone, or in combination of two or more.

[0206] The content of other additives is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, relative to 100 parts by mass of polymer 1.

[0207] <<Preparation Method of Composition for Light Absorption Layer>>

[0208] There are no particular limitations on the preparation method of the composition for the light absorption layer, as long as the components can be mixed uniformly, and known methods can be used.

[0209] There are no particular limitations on the method for forming the light-absorbing layer, as long as the composition for the light-absorbing layer is coated using a known coating method. Examples of such coating methods include: spray coating, roller coating, spin coating, slot die coating, and bar coating.

[0210] <<Support>>

[0211] Examples of supports include absorbent glass, polyethylene terephthalate (PET) sheets, and resin sheets containing the polymer 2 described later. Alternatively, the support may be absorbent glass or absorbent layer 2 described later.

[0212] Examples of absorbing glasses include: fluorophosphate glass and near-infrared absorbing glass (absorbing glass in which CuO or the like is added to phosphate glass, etc.).

[0213] From the viewpoint of superior suppression of fluorescence emission, the support is preferably a layer other than the light-absorbing layer (hereinafter sometimes referred to as "absorbing layer 2") that contains a near-infrared absorber.

[0214] When the support is a layer (absorption layer 2) containing a near-infrared absorber and other than the light-absorbing layer, the fluorescence generated in the light-absorbing layer (fluorescence that cannot be completely extinguished due to Festian energy shift) can be absorbed by the absorption layer 2, resulting in better suppression of fluorescence emission.

[0215] <<Absorbent Layer 2 (Support)>>

[0216] There are no particular limitations on the absorption layer 2, as long as it contains a near-infrared absorber and is a layer other than the light-absorbing layer. For example, the absorption layer 2 is preferably an absorption layer formed of a composition containing the polymer 2 described later and the near-infrared absorber.

[0217] <<Polymer 2>>

[0218] As for the polymer 2 contained in the absorber layer 2, there are no particular limitations as long as the effects of the present invention are not impaired. For example, in terms of ensuring thermal stability and formability of the layer, and being able to easily obtain a layer with excellent vapor deposition resistance, especially a layer that can form a dielectric multilayer film by high-temperature vapor deposition at a vapor deposition temperature of about 100°C, resins with a glass transition temperature (Tg) preferably of 110°C to 380°C, more preferably of 110°C to 370°C, and even more preferably of 120°C to 360°C are suitable examples.

[0219] Furthermore, when the resin has a glass transition temperature (Tg) of 140°C or higher, a layer with superior vapor deposition resistance can be obtained, especially a layer that can be vapor deposited at higher temperatures to form a dielectric multilayer film, and is therefore particularly preferred.

[0220] Examples of such polymers 2 include: cyclic (poly)olefin polymers, polyether polymers, polyimide polymers, polyester polymers, polycarbonate polymers, polyamide (aromatic polyamide) polymers, polyarylate polymers, polysulfone polymers, polyethersulfone polymers, poly(terephthalamide) polymers, polyamide-imide polymers, polyethylene naphthalate (PEN) polymers, fluorinated aromatic polymers, (modified) (meth)acrylic polymers, epoxy polymers, etc.

[0221] Among these, polymer 2 is preferably a cyclic (poly)olefin polymer or a polyarylate polymer.

[0222] The content of polymer 2 is preferably 30% to 98% by mass, more preferably 50% to 90% by mass, relative to the total mass of the composition used in the formation of absorbent layer 2.

[0223] Polymer 2 can be used alone, or two or more can be used together.

[0224] Near-infrared absorber

[0225] The near-infrared absorber used in the formation of the absorption layer 2 has the same meaning as the near-infrared absorber in the light absorption layer, and the preferred form is also the same.

[0226] The content of the near-infrared absorber is preferably 0.03% to 10% by mass, more preferably 0.1% to 1% by mass, relative to the total mass of the composition used in the formation of the absorption layer 2.

[0227] In addition, the content of near-infrared absorber is 0.01 to 1 part by mass relative to 100 parts by mass of polymer 2, more preferably 0.03 to 0.5 parts by mass.

[0228] Near-infrared absorbers can be used alone or in combination with two or more.

[0229] [Other Additives]

[0230] The composition used in forming the absorption layer 2 may also contain compounds other than the polymer 2 and the near-infrared absorber (hereinafter also referred to as "other additives").

[0231] Other additives are not particularly restricted, and examples include: antioxidants (anti-aging agents), ultraviolet absorbers, fluorescent matting agents, and metal complex compounds.

[0232] Other additives may be used alone, or in combination of two or more.

[0233] As ultraviolet absorbers, known ultraviolet absorbers used in the manufacture of optical filters can be used. Examples of ultraviolet absorbers include: azobenzene compounds, indole compounds, benzotriazole compounds, triazine compounds, anthracene compounds, and compounds described in Japanese Patent Application Publication No. 2019-014707.

[0234] In addition, the content of ultraviolet absorber is 0.01 to 1 part by mass relative to 100 parts by mass of polymer 2, more preferably 0.03 to 0.5 parts by mass.

[0235] Ultraviolet absorbers can be used alone or in combination with two or more.

[0236] The thickness of the absorbent layer 2 can be appropriately set within the range that does not impair the effect of the present invention, preferably 30 μm to 300 μm, and more preferably 50 μm to 200 μm.

[0237] As a method for forming the absorption layer 2, the following method can be listed: prepare a composition containing polymer 2, a near-infrared absorber, and other additives as needed for the formation of the absorption layer 2, and then coat the composition to form the absorption layer 2.

[0238] As a coating method for the composition, known coating methods can be used, such as spraying, roller coating, spin coating, slot die coating, bar coating, etc.

[0239] <Outer Coating>

[0240] The laminate of the present invention may include an outer coating on at least one surface of the laminate for purposes such as improving surface hardness, enhancing chemical resistance, antistatic properties, and eliminating scratches. The laminate may include only one outer coating layer or two outer coating layers.

[0241] The outer coating is preferably a layer comprising a composition containing a curable resin (hereinafter sometimes referred to as "curable resin composition"). The curable resin may be a resin that cures by the action of either heat or light.

[0242] Examples of curing resins include epoxy resins, allyl ester curing resins, silsesquioxane photocuring resins, acrylic photocuring resins, and vinyl photocuring resins.

[0243] Preferred curing resins include epoxy resins, silsesquioxane-based photocuring resins, and acrylic photocuring resins.

[0244] The curable resin composition preferably contains a polymerization initiator. Known photopolymerization initiators or thermal polymerization initiators can be used as the polymerization initiator, or a combination of both. One polymerization initiator can be used alone, or two or more can be used in combination.

[0245] When the total amount of the curable resin composition is set to 100% by mass, the content of the polymerization initiator in the curable resin composition is preferably 0.1% to 10% by mass, more preferably 0.5% to 10% by mass, and even more preferably 1% to 5% by mass.

[0246] If the content of the polymerization initiator is within the specified range, a curable resin composition with excellent curing properties and workability can be easily obtained, and an outer coating with the desired hardness can be easily obtained.

[0247] Furthermore, an organic solvent can be added as a solvent to the curable resin composition that can form an outer coating. Known organic solvents can be used as the organic solvent.

[0248] Specific examples of the organic solvents mentioned above include: alcohols such as methanol, ethanol, isopropanol, butanol, and octanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; esters such as ethyl acetate, butyl acetate, ethyl lactate, γ-butyrolactone, propylene glycol monomethyl ether acetate, and propylene glycol monoethyl ether acetate; ethers such as ethylene glycol monomethyl ether and diethylene glycol monobutyl ether; aromatic hydrocarbons such as benzene, toluene, and xylene; and amides such as dimethylformamide, dimethylacetamide, and N-methylpyrrolidone.

[0249] These solvents can be used in one or more ways.

[0250] The curing resin composition may also contain leveling agents or defoamers as additives. By including additives in the curing resin composition, an outer coating can be easily manufactured.

[0251] These additives can be used individually or in combination of two or more.

[0252] The thickness of the outer coating is preferably 0.1 μm to 20 μm, more preferably 0.5 μm to 10 μm, and even more preferably 0.7 μm to 5 μm.

[0253] If the thickness of the outer coating is within the specified range, uneven formation of the outer coating can be easily suppressed, thereby reducing the total thickness of the optical filter.

[0254] There are no particular limitations on the method of forming the outer coating, as long as the composition containing the curable resin is coated by a known coating method. Examples of such coating methods include: spraying, roller coating, spin coating, slot die coating, and bar coating.

[0255] [Optical Filter]

[0256] The optical filter of the present invention includes the stack, preferably including the stack and a dielectric multilayer film disposed on at least one side of the stack.

[0257] <<Dielectric Multilayer Film>>

[0258] Optical filters with low near-infrared transmittance can be easily obtained by using optical filters that include dielectric multilayer films.

[0259] There is no particular limitation on the number of dielectric multilayer films in an optical filter; it can be one or more. Furthermore, the entire dielectric multilayer film exhibiting the desired optical properties (e.g., the 22-layer structure of Design 1 in the embodiments described later) is referred to as a single dielectric multilayer film. Additionally, the portion of the optical filter other than the dielectric multilayer film is sometimes referred to as an "absorbing stack."

[0260] A dielectric multilayer film only needs to be disposed on at least one side of the laminate, either on one side or on both sides of the laminate.

[0261] When a dielectric multilayer film is disposed on one side of a laminate, the manufacturing cost or ease of manufacturing of the optical filter is excellent. When a dielectric multilayer film is disposed on both sides of a laminate, an optical filter with high strength and less prone to warping can be easily obtained.

[0262] The dielectric multilayer film is preferably a film capable of reflecting near-infrared light. As a dielectric multilayer film, it is preferably a film with an average reflectivity of 80% or more, more preferably 90% or more, for unpolarized light incident at an angle of 5° perpendicular to the surface of the dielectric multilayer film in the region of wavelength 650 nm to 1700 nm.

[0263] Furthermore, in this specification, the average reflectance at wavelengths A nm to B nm refers to the value calculated by measuring the reflectance at each wavelength above A nm and below B nm, in units of 1 nm, and dividing the total of the measured reflectances by the number of measured reflectances (wavelength range, B-A+1).

[0264] Since it is extremely difficult to measure the reflectivity of unpolarized light incident from a vertical direction, this specification measures the reflectivity of unpolarized light incident at an angle of 5° to the vertical direction.

[0265] In this specification, "unpolarized ray" refers to ray that does not have a deviation in the polarization direction, and is a collection of waves in which the electric field is distributed approximately uniformly in all directions. The "average transmittance of unpolarized ray" can also be the average of the "average transmittance of S-polarized ray" and the "average transmittance of P-polarized ray". Similarly, the "average reflectance of unpolarized ray" can also be the average of the "average reflectance of S-polarized ray" and the "average reflectance of P-polarized ray".

[0266] Furthermore, the dielectric multilayer film preferably has a reflectivity of 80% or more for light of any wavelength from 800 nm to 1200 nm incident at an angle of 5° to the perpendicular direction of the dielectric multilayer film surface. In particular, when using an optical filter in an imaging device, it is preferable to place the optical filter of the dielectric multilayer film having a reflectivity of 80% or more for light of any wavelength from 800 nm to 1200 nm on the sensor (imaging element) side.

[0267] As a dielectric multilayer film, for example, a laminate formed by alternately stacking high refractive index material layers and low refractive index material layers can be cited.

[0268] As the material constituting the high refractive index material layer, a material with a refractive index of 1.7 or higher can be used, and the refractive index range is typically selected from 1.75 to 2.5.

[0269] Examples of such materials include at least one selected from titanium oxide, zirconium oxide, tantalum pentoxide, niobium pentoxide, lanthanum oxide, yttrium oxide, zinc oxide, zinc sulfide, and indium oxide.

[0270] As the material constituting the low refractive index material layer, a material with a refractive index of less than 1.7 can be used, and the range of refractive index is usually selected from 1.2 to 1.6.

[0271] Examples of such materials include at least one selected from silicon dioxide, aluminum oxide, lanthanum fluoride, magnesium fluoride, and sodium aluminum hexafluoride. Among these, materials with a lower refractive index are preferred, and materials selected from at least one of silicon dioxide and magnesium fluoride are particularly preferred.

[0272] There are no particular limitations on the method of stacking the high-refractive-index material layer and the low-refractive-index material layer, as long as a dielectric multilayer film formed by stacking these material layers is formed. For example, a dielectric multilayer film can be formed by directly and alternately stacking high-refractive-index material layers and low-refractive-index material layers on the absorber stack using methods such as CVD (Chemical Vapor Deposition), sputtering, vacuum evaporation, ion-assisted evaporation, or ion plating.

[0273] Furthermore, if warping occurs in the obtained optical filter during the formation of the dielectric multilayer film, this warping can be suppressed, for example, by forming the dielectric multilayer film on both sides of the optical filter or by irradiating the surface of the dielectric multilayer film with electromagnetic waves such as ultraviolet light. In addition, when irradiating with electromagnetic waves, the electromagnetic waves can be irradiated during the formation of the dielectric multilayer film or separately after the formation of the dielectric multilayer film.

[0274] If the near-infrared wavelength to be blocked is set as λ (nm), then the thickness of each of these high-refractive-index material layers and low-refractive-index material layers is typically preferably 0.1λ to 0.5λ. If the thickness is within this range, the product of the refractive index (n) and the film thickness (d) (n×d) becomes approximately the same as the optical film thickness calculated using λ / 4, as well as the thickness of each of the high-refractive-index material layer and low-refractive-index material layer. Based on the relationship between the optical properties of reflection and refraction, there is a tendency to easily control the blocking and transmission of a specific wavelength.

[0275] Furthermore, each of these high-refractive-index material layers and low-refractive-index material layers may be a layer with a thickness other than 0.1λ to 0.5λ. Such layers with a thickness other than 0.1λ to 0.5λ are particularly preferably present in the outermost layer of the 10 layers near the absorbing laminate or the dielectric multilayer film.

[0276] The total number of layers of high-refractive-index material layers and low-refractive-index material layers in the dielectric multilayer film is preferably 5 to 60 layers, more preferably 6 to 50 layers.

[0277] [Solid-state camera device]

[0278] The optical filter of the present invention is suitable for use in solid-state imaging devices due to its excellent interlayer bonding and vapor deposition resistance. Here, "solid-state imaging device" refers to an image sensor including a solid-state imaging element such as a CCD or CMOS image sensor; specifically, it can be used in digital still cameras, smartphone cameras, mobile phone cameras, wearable device cameras, digital video cameras, and the like. Furthermore, it can also be effectively used as a heat-blocking filter mounted on glass in automobiles or buildings.

[0279] [Camera Module]

[0280] The optical filter of the present invention is suitable for use in camera modules due to its excellent interlayer bonding and vapor deposition resistance. Furthermore, the optical filter is suitable for use in the perception correction of solid-state imaging elements such as CCD or CMOS image sensors in camera modules due to its wide viewing angle and excellent near-infrared cutoff capability.

[0281] In particular, it can be effectively used in solid-state imaging devices such as digital still cameras, mobile phone cameras, digital video cameras, personal computer (PC) cameras, surveillance cameras, and automotive cameras; televisions; car navigation systems; portable information terminals; personal computers; video game consoles; portable game consoles; fingerprint authentication systems; and digital music players. Furthermore, it can also be effectively used as a heat radiation cutoff filter installed on glass in automobiles or buildings.

[0282] [Example]

[0283] The present invention will now be described in detail based on embodiments, but the present invention is not limited to these embodiments.

[0284] (Spectroscopic transmittance)

[0285] The transmittance of the optical filters obtained in the following examples or comparative examples in each wavelength region was measured using a spectrophotometer (U-4100) manufactured by Hitachi High-Tech Co., Ltd.

[0286] <Interlayer tightness>

[0287] For the laminates produced in the following embodiments and comparative examples, the surface of the light-absorbing layer is cut transversely (to reach the absorption layer 2) into a 10 mm × 10 mm checkerboard pattern (25 squares). Transparent tape (cellophanetape) is attached to the checkerboard pattern and peeled off at a 90° angle relative to the surface of the laminate. At this time, the number of squares in which the coating film remains after being peeled off from the laminate is visually confirmed, and the adhesion is evaluated according to the following evaluation criteria.

[0288] When the contactability rating is "○" or "△", it can be said that the contactability is excellent. Furthermore, when the contactability rating is "△", it can be said that it is at a level where there are no practical problems.

[0289] -Evaluation Criteria-

[0290] “○”: The number of cells remaining that were not separated from the stack is 25.

[0291] “△”: The number of cells remaining after not being peeled off from the stacked body ranges from 1 to 24.

[0292] "×": The number of cells remaining that were not separated from the stack is 0.

[0293] <Vapor Deposition Resistance (Appearance after Vapor Deposition)>

[0294] For the laminates and optical filters with the dielectric multilayer film described later in the embodiments and comparative examples, the appearance after evaporation is evaluated by visually observing the filters according to the following evaluation criteria.

[0295] If the appearance evaluation after vapor deposition is "○" or "△", it can be said that the appearance after vapor deposition is good and excellent. Furthermore, if the appearance evaluation after vapor deposition is "△", it can be said that the product is at a level where there are no practical problems.

[0296] -Evaluation Criteria-

[0297] “○”: No cracks or roughness after vapor deposition, making it practical.

[0298] "△": Local cracks and surface roughness were detected after vapor deposition, but the level is not a problem for practical use.

[0299] "×": Large cracks were found after vapor deposition, or the entire surface was found to be rough, making it unusable.

[0300] [Example 1]

[0301] (Preparation of liquid in absorbent layer 2 (i))

[0302] An absorber layer 2 liquid (i) with a solid content concentration of 20% by weight is obtained by adding 100 parts by weight of a cyclic olefin resin (manufactured by Japan Synthetic Rubber (JSR) Co., Ltd., product name: "Arton G7800"), 0.054 parts by weight of the following near-infrared absorber 1, 0.185 parts by weight of the following ultraviolet absorber 1 (manufactured by ADEKA Co., Ltd., product name: Adekastab LA-24), 0.3 parts by weight of the following anti-aging agent 1, 0.3 parts by weight of the following anti-aging agent 2, and dichloromethane.

[0303] • Near-infrared absorber 1: The compound represented by the following structure.

[0304] [Chemistry 1]

[0305]

[0306] • Ultraviolet absorber 1: The compound represented by the following structure.

[0307] [Chemistry 2]

[0308]

[0309] • Anti-aging agent 1: The compound represented by the following structure.

[0310] [Chemistry 3]

[0311]

[0312] • Anti-aging agent 2: The compound represented by the following structure.

[0313] [Chemistry 4]

[0314]

[0315] <<Fabrication of Absorbent Layer 2 (Support)>>

[0316] The prepared absorbent layer 2 liquid (i) was cast (i.e., cast into shape) onto a smooth PET sheet to form a layer. Then, after drying at 20°C for 8 hours, it was peeled off from the PET sheet. The peeled coating was then dried under reduced pressure at 100°C for 8 hours to obtain an absorbent layer 2 (support) with a thickness of 200 μm and dimensions of 20 cm × 30 cm.

[0317] (Preparation of intermediate layer 1 liquid (i))

[0318] In a container, measure out 80 parts by weight of the following monomers: 20 parts by weight of urethane acrylate (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-122P), 3 parts by weight of the following photopolymerization initiator 1 (manufactured by BASF, product name: Irgacure 184), and 0.2 parts by weight of the following coating surface modifier 1 (manufactured by Shin-Etsu Chemical Industry Co., Ltd., product name: KP-624). Dilute with a solvent containing MEK (methyl ethyl ketone): IPA (isopropanol): PGME (propylene glycol monomethyl ether) at a mixing ratio of 20:45:35 (capacity%) to prepare an intermediate layer 1 liquid (i) (resin composition) with a solid content concentration of 22% by weight.

[0319] • Photopolymerization initiator 1: The compound represented by the following structure.

[0320] [Chemistry 5]

[0321]

[0322] • Monomer 1: The compound represented by the following structure. That is, monomer 1 is a monomer having 1 to 6 (meth)acryloyl groups.

[0323] [Chemistry 6]

[0324]

[0325] <<Fabrication of Intermediate Layer 1 (Curing Film)>>

[0326] The prepared absorber layer 2 is prepared, and then the prepared intermediate layer 1 liquid (i) (resin composition) is applied to the surface of the absorber layer 2 by a bar coating method with a resin layer (hardened film) thickness of 2 μm. Ultraviolet light is irradiated under a nitrogen atmosphere, thereby hardening the resin composition to form a hardened film, resulting in a laminate (absorber layer 2 (support) / intermediate layer 1 (hardened film)) with intermediate layer 1 formed on absorber layer 2.

[0327] <<Fabrication of the Light Absorption Layer>>

[0328] (Synthesis of polymer 1-1)

[0329] In a flask including a cooling tube and a stirrer, 0.01 parts by mass of 2,2'-azobis(2,4-dimethylpentanonitrile) and 200 parts by mass of cyclopentanone were pre-charged. 100 parts by mass of an unsaturated mixture comprising 40% by mass of methyl methacrylate (MMA) and 60% by mass of N-cyclohexyl maleimide (CHMI) were added, and after nitrogen purging, stirring was slowly initiated. The solution temperature was raised to 70°C and maintained at this temperature for 5 hours to complete the polymerization. The resulting solution was then added dropwise to a large volume of methanol to solidify the reaction product. The resulting solid was vacuum dried at 45°C for 4 hours to obtain polymer 1-1.

[0330] For the obtained polymer 1-1, the molecular weight of polystyrene was determined using a gel permeation chromatography (GPC) apparatus (manufactured by Showa Denko Co., Ltd., model: GPC-104, column: a column composed of three LF-604 and KF-602 manufactured by Showa Denko Co., Ltd., developing solvent: tetrahydrofuran). The results were a weight average molecular weight (Mw) of 400,000 and a number average molecular weight (Mn) of 160,000.

[0331] (Preparation of the light-absorbing layer solution)

[0332] The synthesized polymer 1:100 parts by mass, near-infrared absorber 2:2.5 parts by mass, near-infrared absorber 3:1.5 parts by mass, near-infrared absorber 4:3.75 parts by mass, anti-aging agent 1:0.3 parts by mass, and anti-aging agent 2:0.3 parts by mass were respectively measured and diluted with a solvent of 1,3-dioxane / MEK / propylene glycol monomethyl ether acetate (PGMEA) in a mixing ratio of 65 / 20 / 15 (capacity%) to prepare a light-absorbing layer solution (composition for light-absorbing layer) with a solid component concentration of 16% by mass.

[0333] <<Fabrication of the Light Absorption Layer>>

[0334] Prepare the laminate (absorbing layer 2 / intermediate layer 1) by applying a light-absorbing layer solution onto the surface of intermediate layer 1 in the laminate using a rod coating method, with the obtained light-absorbing layer having a thickness of 5 μm. Heat the coating at 70°C for 3 minutes, and then at 120°C for 5 minutes to form a light-absorbing layer, thereby obtaining the laminate (absorbing layer 2 (support) / intermediate layer 1 (hardening film) / light-absorbing layer).

[0335] <<Creation of Overcoat (OC) Layer 1>>

[0336] (Preparation of liquid in OC layer 1)

[0337] In a container, measure out 37.5 parts by weight of resin 2, 62.5 parts by weight of resin 3, 3 parts by weight of photopolymerization initiator 1, and 0.08 parts by weight of coating surface modifier 2 (manufactured by Shin-Etsu Chemical Industry Co., Ltd., model: KP-423). Dilute with a solvent of IPA:MEK = 10:90 (capacity%) to prepare a liquid OC layer 1 (curing resin composition) with a solid component concentration of 22% by weight.

[0338] Next, a laminate (absorbing layer 2 / intermediate layer 1 / light-absorbing layer) is prepared. The prepared OC layer 1 is liquid-coated onto the surface of the light-absorbing layer using a rod coating method, with the obtained resin layer having a thickness of 2.2 μm. Ultraviolet irradiation is then performed in a nitrogen atmosphere to harden the laminate and form OC layer 1, thus obtaining the laminate (absorbing layer 2 (support) / intermediate layer 1 (hardened film) / light-absorbing layer / OC layer 1).

[0339] • Resin 2: The compound represented by the following structure.

[0340] [Chemistry 7]

[0341]

[0342] • Resin 3: The compound represented by the following structure.

[0343] [Chemistry 8]

[0344]

[0345] <<Creation of OC (Outer Coating) Layer 2>>

[0346] (Preparation of liquid in OC layer 2)

[0347] In a container, separately measure out 2:30 parts by weight of resin, 3:50 parts by weight of resin, 1:20 parts by weight of resin, 1:3 parts by weight of photopolymerization initiator, and 0.08 parts by weight of coating surface modifier 2 (manufactured by Shin-Etsu Chemical Industry Co., Ltd., model: KP-423). Dilute with a solvent of IPA:PGME:MEK = 45:35:20 (capacity%) to prepare a resin composition (OC layer 2 liquid) with a solid component concentration of 22% by weight for the preparation of OC layer 2.

[0348] Next, a laminate (absorbing layer 2 / intermediate layer 1 / light-absorbing layer / OC layer 1) is prepared. The resin composition (OC layer 2 liquid) for preparing the OC layer 2 is applied to the surface of the absorbing layer 2 using a rod coating method, with the obtained resin layer thickness being 2 μm. The OC layer 2 is then cured by ultraviolet irradiation under a nitrogen atmosphere.

[0349] Thus, a laminate is fabricated in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1.

[0350] <Fabrication of Optical Filters>

[0351] On the OC layer 1 of the obtained laminate, a dielectric multilayer film of design 1 is formed using an ion-assisted evaporation apparatus (manufactured by Showa Vacuum Corporation, Sapio 1300i). On the OC layer 2 of the obtained laminate, a dielectric multilayer film of design 2 is formed using an ion-assisted evaporation apparatus (manufactured by Showa Vacuum Corporation, Sapio 1300i). Thus, an optical filter with a dielectric multilayer film is obtained.

[0352] The obtained optical filters were evaluated as described above. The results are shown in Table 1.

[0353] [Table 1]

[0354]

[0355] [Table 2]

[0356]

[0357] [Example 2]

[0358] <<The Creation of Intermediate Layer 1>>

[0359] In Example 1, urethane acrylate 1, which is a photocurable elastic polymer, was replaced with urethane acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000). Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, the intermediate layer 1 was prepared in the same manner as in Example 1.

[0360] <Fabrication of Optical Filters>

[0361] In Example 1, an intermediate layer 1 is fabricated as described above. Except for this, an absorption layer 2, an intermediate layer 1, a light-absorbing layer, an OC layer 1, and an OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light-absorbing layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0362] The obtained optical filters were evaluated as described above. The results are shown in Table 3.

[0363] [Example 3]

[0364] <<The Creation of Intermediate Layer 1>>

[0365] In Example 1, the amount of monomer 1 was changed to 70 parts by mass, and urethane acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000): 30 parts by mass was used as the photocurable elastic polymer. Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, the intermediate layer 1 was prepared in the same manner as in Example 1.

[0366] <Fabrication of Optical Filters>

[0367] In the above, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0368] The obtained optical filters were evaluated as described above. The results are shown in Table 3.

[0369] [Example 4]

[0370] <<The Creation of Intermediate Layer 1>>

[0371] In Example 1, the amount of monomer 1 was changed to 90 parts by mass, and urethane acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000): 10 parts by mass was used as the photocurable elastic polymer. Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, the intermediate layer 1 was prepared in the same manner as in Example 1.

[0372] <Fabrication of Optical Filters>

[0373] In the above, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0374] The obtained optical filters were evaluated as described above. The results are shown in Table 3.

[0375] [Example 5]

[0376] <<The Creation of Intermediate Layer 1>>

[0377] In Example 1, monomer 1 was replaced with monomer 2, and urethane acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000) was used as the photocurable elastic polymer. Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, intermediate layer 1 was prepared in the same manner as in Example 1.

[0378] • Monomer 2: The compound represented by the following structure.

[0379] [Chemistry 9]

[0380]

[0381] <Fabrication of Optical Filters>

[0382] In the above, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0383] The obtained optical filters were evaluated as described above. The results are shown in Table 3.

[0384] [Example 6]

[0385] <<The Creation of Intermediate Layer 1>>

[0386] In Example 1, urethane acrylate 1, which is used as a photocurable elastic polymer, was replaced with urethane acrylate 5 (manufactured by Taisei Fine Chemicals Co., Ltd., product name: 8KX-078, weight average molecular weight: 40,000±10,000). Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, the intermediate layer 1 was prepared in the same manner as in Example 1.

[0387] <Fabrication of Optical Filters>

[0388] In Example 1, an intermediate layer 1 is fabricated as described above. Except for this, an absorption layer 2, a light absorption layer, an OC layer 1, and an OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0389] The obtained optical filters were evaluated as described above. The results are shown in Table 3.

[0390] [Example 7]

[0391] <<The Creation of Intermediate Layer 1>>

[0392] In Example 1, monomer 1 was replaced with monomer 3, and urethane acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000) was used as the photocurable elastic polymer. Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, intermediate layer 1 was prepared in the same manner as in Example 1.

[0393] • Monomer 3: Difunctional aromatic monomer (alkoxylated bisphenol A acrylate): The compound represented by the following structure.

[0394] [Chemistry 10]

[0395]

[0396] <Fabrication of Optical Filters>

[0397] In Example 1, an intermediate layer 1 is fabricated as described above. Except for this, an absorption layer 2, a light absorption layer, an OC layer 1, and an OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0398] The obtained optical filters were evaluated as described above. The results are shown in Table 3.

[0399] [Example 8]

[0400] <<The Creation of Intermediate Layer 1>>

[0401] In Example 1, monomer 1 was replaced with monomer 4, and urethane acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000) was used as the photocurable elastic polymer. Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, intermediate layer 1 was prepared in the same manner as in Example 1.

[0402] • Monomer 4: Difunctional aliphatic monomer (alkyl acrylate): Compounds represented by the following structures.

[0403] [Chemistry 11]

[0404]

[0405] <Fabrication of Optical Filters>

[0406] In Example 1, an intermediate layer 1 is fabricated as described above. Except for this, an absorption layer 2, a light absorption layer, an OC layer 1, and an OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0407] The obtained optical filters were evaluated as described above. The results are shown in Table 3.

[0408] [Example 9]

[0409] <<The Creation of Intermediate Layer 1>>

[0410] In Example 1, monomer 1 was replaced with monomer 5, and urethane acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000) was used as the photocurable elastic polymer. Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, intermediate layer 1 was prepared in the same manner as in Example 1.

[0411] • Monomer 5: The monomer with a heterocyclic structure as represented by the following structure.

[0412] [Chemistry 12]

[0413]

[0414] <Fabrication of Optical Filters>

[0415] In Example 1, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0416] The obtained optical filters were evaluated as described above. The results are shown in Table 3.

[0417] [Example 10]

[0418] <<The Creation of Intermediate Layer 1>>

[0419] In Example 1, monomer 1 was replaced with monomer 6, and urethane acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000) was used as the photocurable elastic polymer. Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, the intermediate layer 1 was prepared in the same manner as in Example 1.

[0420] • Monomer 6: The polyfunctional acrylic compound represented by the following structure.

[0421] [Chemistry 13]

[0422]

[0423] <Fabrication of Optical Filters>

[0424] In Example 1, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0425] The obtained optical filters were evaluated as described above. The results are shown in Table 4.

[0426] [Example 11]

[0427] <<The Creation of Intermediate Layer 1>>

[0428] In Example 1, monomer 1 was replaced with monomer 7, and urethane acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000) was used as the photocurable elastic polymer. Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, intermediate layer 1 was prepared in the same manner as in Example 1.

[0429] • Monomer 7: The hexafunctional monomer (alkoxylated) dipentaerythritol acrylate represented by the following structure.

[0430] [Chemistry 14]

[0431]

[0432] <Fabrication of Optical Filters>

[0433] In Example 1, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0434] The obtained optical filters were evaluated as described above. The results are shown in Table 4.

[0435] [Example 12]

[0436] <<The Creation of Intermediate Layer 1>>

[0437] In Example 1, the urethane acrylate 1 used as the photocurable elastic polymer was changed to urethane acrylate 6 (manufactured by Tokushiki Co., Ltd., product name: AUP2301). Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, the intermediate layer 1 was prepared in the same manner as in Example 1.

[0438] <Fabrication of Optical Filters>

[0439] In Example 1, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0440] The obtained optical filters were evaluated as described above. The results are shown in Table 4.

[0441] [Example 13]

[0442] <<The Creation of Intermediate Layer 1>>

[0443] In Example 1, the urethane acrylate 1, which is a photocurable elastic polymer, was replaced with a nonylphenol ethylene oxide (EO) modified acrylate (manufactured by Dong-A Synthetic Co., Ltd., product name: M-111) with the following structure. Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, the intermediate layer 1 was prepared in the same manner as in Example 1.

[0444] [Chemistry 15]

[0445]

[0446] <Fabrication of Optical Filters>

[0447] In Example 1, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0448] The obtained optical filters were evaluated as described above. The results are shown in Table 4.

[0449] [Example 14]

[0450] <<The Creation of Intermediate Layer 1>>

[0451] In Example 1, the urethane acrylate 1, which is a photocurable elastic polymer, was replaced with polyrotaxane (manufactured by ASM Corporation, product name: SeRM Super Polymer SM / SA series SA1305P-20). Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, the intermediate layer 1 was prepared in the same manner as in Example 1.

[0452] <Fabrication of Optical Filters>

[0453] In Example 1, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0454] The obtained optical filters were evaluated as described above. The results are shown in Table 4.

[0455] [Example 15]

[0456] <<The Creation of Intermediate Layer 1>>

[0457] In Example 1, the type of photopolymerization initiator was changed to photopolymerization initiator 2 described below. Otherwise, the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, the intermediate layer 1 was prepared in the same manner as in Example 1.

[0458] [Chemistry 16]

[0459]

[0460] <Fabrication of Optical Filters>

[0461] In Example 1, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0462] The obtained optical filters were evaluated as described above. The results are shown in Table 4.

[0463] [Example 16]

[0464] <<The Creation of Intermediate Layer 1>>

[0465] In Example 1, the solvent was changed to MEK (methyl ethyl ketone), and the intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. The intermediate layer 1 was then prepared using the obtained resin composition in the same manner as in Example 1.

[0466] <Fabrication of Optical Filters>

[0467] In Example 1, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, thereby creating a laminate with each layer formed in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained laminate, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0468] The obtained optical filters were evaluated as described above. The results are shown in Table 4.

[0469] [Example 17]

[0470] <<Fabrication of Absorbent Layer 2 (Support)>>

[0471] (Preparation of liquid in absorbent layer 2 (i))

[0472] An absorber layer 2 liquid (i) with a solid content concentration of 20% by weight is obtained by adding 100 parts by weight of a cyclic olefin resin (manufactured by Japan Synthetic Rubber (JSR) Co., Ltd., product name: "Arton G7800"), 0.027 parts by weight of the near-infrared absorber 1, 0.0925 parts by weight of the ultraviolet absorber 1 (manufactured by ADEKA Co., Ltd., product name: Adekastab LA-24), 0.15 parts by weight of the anti-aging agent 1, 0.15 parts by weight of the anti-aging agent 2, and dichloromethane.

[0473] The prepared absorbent layer 2 liquid (i) was cast (i.e., cast into shape) onto a smooth PET sheet to form a layer. Then, after drying at 20°C for 8 hours, it was peeled off from the PET sheet. The peeled coating was then dried under reduced pressure at 100°C for 8 hours to obtain an absorbent layer 2 with a thickness of 100 μm and dimensions of 20 cm × 30 cm. Two absorbent layers 2 (supports) were fabricated.

[0474] <<Fabrication of Intermediate Layer 1 (Curing Film)>>

[0475] (Preparation of intermediate layer 1 liquid (i))

[0476] In Example 1, the types of monomers were changed to those listed in Table 5, and the monomers were formulated in the mass ratio listed in Table 5 (monomer 1 / monomer 9 below / monomer 10 below = 25:67.5:7.5). Urafra acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000) was used as the photocurable elastic polymer. Otherwise, an intermediate layer 1 liquid (i) (resin composition) with a solid content concentration of 22% by mass was prepared in the same manner as in Example 1.

[0477] • Monomer 9: Adamantyl urethane acrylate: The compound represented by the following structure.

[0478] [Chemistry 17]

[0479]

[0480] • Monomer 10: EO-modified diacrylate and EO-modified triacrylate of isocyanuric acid: compounds represented by the following structures. In the following formulas, R represents H or COCH=CH2.

[0481] 30%–40% by mass: R = H

[0482] 60%–70% by mass: R = COCH = CH2

[0483] [Chemistry 18]

[0484]

[0485] <<Fabrication of Intermediate Layer 1 (Curing Film)>>

[0486] Prepare one of the absorber layers 2 (supports) to be fabricated. Then, using a bar coating method, apply the prepared intermediate layer 1 liquid (i) (resin composition) to the surface of the absorber layer 2 with a resin layer (hardened film) thickness of 2 μm. Irradiate with ultraviolet light in a nitrogen atmosphere to harden the resin composition and form a hardened film, thus obtaining a laminate (absorber layer 2 / intermediate layer 1 (hardened film)) with intermediate layer 1 formed on absorber layer 2.

[0487] <<Fabrication of the Light Absorption Layer>>

[0488] The composition for the light-absorbing layer was prepared in the same manner as in Example 1.

[0489] Prepare the laminate (absorbing layer 2 / intermediate layer 1) by applying a light-absorbing layer solution onto the surface of intermediate layer 1 in the laminate using a rod coating method, with the obtained light-absorbing layer having a thickness of 5 μm. Heat the coating at 70°C for 3 minutes, and then at 120°C for 5 minutes to form a light-absorbing layer, thereby obtaining the laminate (absorbing layer 2 (support) / intermediate layer 1 (hardening film) / light-absorbing layer).

[0490] <<Formation of the Adhesive Layer>>

[0491] On the light-absorbing layer side of the fabricated laminate (absorbing layer 2 (support) / intermediate layer 1 (curing film) / light-absorbing layer), a UV-curable acrylic adhesive (manufactured by ThreeBond Inc., trade name "TB-UVOCR") is applied using a rod coating method and dried. It is then cured by ultraviolet irradiation in a nitrogen atmosphere to form an adhesive layer. Next, the prepared absorbing layer 2 (support) is bonded to the adhesive layer to create a laminate in the order of absorbing layer 2 (support) / adhesive layer / light-absorbing layer / intermediate layer 1 (curing film) / absorbing layer 2 (support).

[0492] <<Creation of OC (Outer Coating) Layer 1>>

[0493] The OC layer 1 liquid was prepared in the same manner as in Example 1. Then, the prepared laminate (absorbing layer 2 (support) / adhesive layer / light-absorbing layer / intermediate layer 1 (hardening film) / absorbing layer 2 (support)) was prepared, and the OC layer 1 liquid was applied to the surface of the absorbing layer 2 (support) adjacent to the intermediate layer 1 (hardening film) using a rod coating method, with the thickness of the obtained resin layer (OC layer 1) being 2.2 μm. Ultraviolet irradiation was performed under a nitrogen atmosphere to harden the laminate and form the OC layer 1, thus obtaining a laminate formed in the order of absorbing layer 2 (support) / adhesive layer / light-absorbing layer / intermediate layer 1 (hardening film) / absorbing layer 2 (support) / OC layer 1.

[0494] <<Creation of OC (Outer Coating) Layer 2>>

[0495] The OC layer 2 liquid was prepared in the same manner as in Example 1. Then, the fabricated laminate (absorbing layer 2 (support) / adhesive layer / light-absorbing layer / intermediate layer 1 (hardening film) / absorbing layer 2 (support) / OC layer 1) was prepared, and the resin composition (OC layer 2 liquid) for fabricating the OC layer 2 was applied to the surface of the absorbing layer 2 adjacent to the adhesive layer using a rod coating method, with the thickness of the obtained resin layer (OC layer 2) being 2 μm. The mixture was then cured by ultraviolet irradiation under a nitrogen atmosphere to form the OC layer 2.

[0496] In this way, a laminate is formed in the order of OC layer 2 / absorption layer 2 (support) / adhesive layer / light absorption layer / intermediate layer 1 (hardening film) / absorption layer 2 (support) / OC layer 1.

[0497] <Fabrication of Optical Filters>

[0498] For the fabricated laminate (OC layer 2 / absorbent layer 2 (support) / adhesive layer / light absorption layer / intermediate layer 1 (hardening film) / absorbent layer 2 (support) / OC layer 1), similarly to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0499] The obtained optical filter underwent the same evaluations as in Example 1. The results are shown in Table 5.

[0500] [Example 18]

[0501] <<Preparation of Intermediate Layer 1 Liquid (i)>>

[0502] In the preparation of intermediate layer 1 liquid (i) in Example 17, the type of monomer was changed to the type recorded in Table 5, and the monomer mixing ratio was set to the mass ratio recorded in Table 5 (monomer 1 / monomer 9 / monomer 11 below = 25:67.5:7.5). Urafra acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000) was used as the photocurable elastic polymer. Otherwise, intermediate layer 1 liquid (i) (resin composition) with a solid content concentration of 22% by mass was prepared in the same manner as in Example 1.

[0503] • Monomer 11: Trimethylolpropane triacrylate, the compound represented by the following structure.

[0504] [Chemistry 19]

[0505]

[0506] <Fabrication of Optical Filters>

[0507] The intermediate layer 1 liquid (i) is used in the formation of the intermediate layer 1. Apart from this, the intermediate layer 1, absorption layer 2, light absorption layer, adhesive layer, OC layer 1, and OC layer 2 are all made using the same raw materials as in Example 17. Similar to Example 17, a laminate containing the layers in the order of OC layer 2 / absorption layer 2 (support) / adhesive layer / light absorption layer / intermediate layer 1 (hardening film) / absorption layer 2 (support) / OC layer 1 is fabricated by respectively laminating the intermediate layer 1, absorption layer 2, light absorption layer, adhesive layer, OC layer 1, and OC layer 2.

[0508] For the obtained laminate, similar to Example 1, a dielectric multilayer film of Design 1 is deposited on the OC layer 1 of the laminate, and a dielectric multilayer film of Design 2 is deposited on the OC layer 2 of the laminate, thereby fabricating an optical filter with a dielectric multilayer film.

[0509] The obtained optical filters were evaluated as described above. The results are shown in Table 5.

[0510] [Comparative Example 1]

[0511] <<The Creation of Intermediate Layer 1>>

[0512] In Example 1, monomer 1 was changed to monomer 8 in 60 parts by mass, and the photocurable elastic polymer was changed to polyrotaxane (manufactured by ASM Corporation, product name: SeRMSuper Polymer SM / SA series) in 40 parts by mass, as represented by the structure described above. The photopolymerization initiator was changed to photopolymerization initiator 3 (Darocur TPO, manufactured by Ciba Specialty Chemicals), and the solvent was changed to MEK (methyl ethyl ketone). Otherwise, intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, intermediate layer 1 was prepared in the same manner as in Example 1.

[0513] • Monomer 8: The compound represented by the following structure (trimethylolpropane triacrylate).

[0514] [Chemistry 20]

[0515]

[0516] <Fabrication of Optical Filters>

[0517] In Example 1, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, forming a stack with each layer in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained stack, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the stack, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the stack, thereby fabricating an optical filter with a dielectric multilayer film.

[0518] The obtained optical filters were evaluated as described above. The results are shown in Table 4.

[0519] [Comparative Example 2]

[0520] <<The Creation of Intermediate Layer 1>>

[0521] In Example 1, the amount of monomer 1 was changed to 50 parts by mass, and urethane acrylate 1 was changed to urethane acrylate 3 (manufactured by Shin-Nakamura Chemical Industry Co., Ltd., product name: UA-1138P, weight average molecular weight (Mw): 33,000): 50 parts by mass, whichever was different. Intermediate layer 1 liquid (i) (resin composition) was prepared in the same manner as in Example 1. Using the obtained resin composition, intermediate layer 1 was prepared in the same manner as in Example 1.

[0522] <Fabrication of Optical Filters>

[0523] In Example 1, intermediate layer 1 is fabricated as described above. Except for this, absorption layer 2, light absorption layer, OC layer 1, and OC layer 2 are fabricated in the same manner as in Example 1, forming a stack with each layer in the order of OC layer 2 / absorption layer 2 (support) / intermediate layer 1 (hardening film) / light absorption layer / OC layer 1. For the obtained stack, similar to Example 1, a dielectric multilayer film of design 1 is deposited on the OC layer 1 of the stack, and a dielectric multilayer film of design 2 is deposited on the OC layer 2 of the stack, thereby fabricating an optical filter with a dielectric multilayer film.

[0524] The obtained optical filters were evaluated as described above. The results are shown in Table 4.

[0525] [Table 3]

[0526]

[0527] [Table 4]

[0528]

[0529] [Table 5]

[0530]

[0531] It is evident that, compared to optical filters comprising a laminate (intermediate layer) formed from the compositions of Comparative Examples 1 and 2, optical filters comprising a laminate (intermediate layer) formed from the compositions of the examples exhibit superior interlayer adhesion and vapor deposition resistance.

Claims

1. A resin composition comprising a monomer having 1 to 6 (meth)acryloyl groups, a photocurable elastic polymer, a photopolymerization initiator, and an organic solvent. The mass ratio of the monomer to the photocurable elastic polymer is 95:5 to 70:

30.

2. The resin composition according to claim 1, wherein the photocurable elastic polymer has an elongation of 50% to 250% as determined by the American Society for Testing and Materials (ASTM) D638.

3. The resin composition according to claim 1, wherein the photocurable elastic polymer is urethane acrylate.

4. The resin composition according to claim 1, wherein the monomer is a compound having an alicyclic structure.

5. A hardened film formed by hardening a resin composition as described in any one of claims 1 to 4.

6. A laminated body, comprising: The hardened film as described in claim 5, and A light-absorbing layer is disposed on at least one side of the hardened film.

7. An optical filter comprising the laminate as described in claim 6.

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