Photocurable composition

Abstract

The present invention aims to provide a photocurable composition that can form a cured product that has good adhesion to an inorganic base material and good ion migration resistance. The photocurable composition contains: 40%–80% by mass of a monofunctional acrylic monomer (A), relative to 100% by mass of the composition; 10%–50% by mass of a multifunctional acrylic monomer (B) relative to 100% by mass of the composition; and 0.1%–30% by mass of a hydroxyl number adjustment agent (C), relative to 100% by mass of the composition. The hydroxyl number for the composition is 1–100 mg KOH / g.

Description

[Technical field]

[0001] The present invention relates to a photocurable composition that is suitably used in the production of display elements, printed wiring boards, flexible wiring boards, semiconductor package substrates, solar cell substrates, and other electronic circuit boards. [Background technology]

[0002] Conventionally, various researches have been conducted on coating agents that form a film on the surface of substrates such as various resin plates, glass plates, and metal plates used in the fields of construction materials and electrical and electronics, and protect the substrates from scratches and contamination. Thermosetting resins and photocurable resins are used as coating agents, and photocurable resins are often used to protect the surface of organic substrates because they often produce cured products with high surface hardness and cure instantly by light irradiation, resulting in high productivity. However, cured products using photocurable resins generally do not have sufficient adhesion to inorganic substrates. Therefore, various studies have been conducted to improve adhesion to inorganic substrates.

[0003] For example, Patent Document 1 describes a photocurable inkjet ink that contains a specific monofunctional polymerizable monomer component (A), a polyfunctional polymerizable monomer (B), and a polymerization initiator (C) in a specific amount. By using the photocurable inkjet ink, a cured product with good adhesion to inorganic substrates can be formed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. WO2013 / 015125 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as electronic components become thinner and smaller, the cured film using the photocurable inkjet ink described in Patent Document 1 is sometimes insufficient. For example, when a cured film with a thickness of about 10 μm that insulates an EMI shield from metal wiring is formed using the photocurable inkjet ink described in Patent Document 1, it was found that ion migration occurs during a reliability test. Here, ion migration is a phenomenon in which metals used as wiring or electrodes are ionized, move, and grow, which causes short circuits in electronic components. For this reason, preventing ion migration is important from the viewpoint of the reliability of electronic components. An object of the present invention is to provide a photocurable composition capable of forming a cured product having good adhesion to inorganic substrates and good resistance to ion migration. [Means for solving the problem]

[0006] The present inventors have conducted research to solve the above problems and have found that a combination of specific components results in a composition that has good adhesion to inorganic substrates and is capable of forming a cured product with good ion migration resistance. The present invention is based on this finding and has the following features.

[0007] [1] A photocurable composition comprising, based on 100 weight % of the composition, 40 to 80 weight % of a monofunctional acrylic monomer (A), based on 100 weight % of the composition, 10 to 50 weight % of a polyfunctional acrylic monomer (B), based on 100 weight % of the composition, and 0.1 to 30 weight % of a hydroxyl value adjuster (C), based on 100 weight % of the composition, wherein the photocurable composition has a hydroxyl value of 1 to 100 mgKOH / g.

[0008] [2] The photocurable composition according to [1], wherein the hydroxyl value regulator (C) has a hydroxyl value of 100 to 300 mgKOH / g and a weight average molecular weight of 100 to 5,000. [3] The photocurable composition according to [1], wherein the hydroxyl value regulator (C) has a hydroxyl value of 150 to 250 mgKOH / g and a weight average molecular weight of 100 to 5,000. [4] The photocurable composition according to [2] or [3], wherein the hydroxyl value regulator (C) contains an acrylic oligomer or a (meth)acrylic monomer having a hydroxyl group.

[0009] [5] The photocurable composition according to [1], wherein the monofunctional acrylic monomer (A) contains a (meth)acrylate having one or more groups selected from the group consisting of a fused cyclic hydrocarbon group, a polycyclic hydrocarbon group, and a monocyclic hydrocarbon group. [6] The photocurable composition according to [5], wherein the monofunctional acrylic monomer (A) is a monofunctional acrylic monomer represented by the following formula (1): [ka] (In formula (1), R 1 is hydrogen or methyl, and R 2 is a monovalent organic group having 4 to 30 carbon atoms and having a fused cyclic hydrocarbon group, a polycyclic hydrocarbon group, or a monocyclic hydrocarbon group, n A is an integer between 0 and 10.)

[0010] [7] R in the above formula (1) 2 is a group represented by any one of the following formulas (2) to (5): [ka] (In formulas (2) to (5), R 3 are each independently hydrogen or alkyl having 1 to 6 carbon atoms, and * is a bond.

[0011] [8] The photocurable composition according to [7], wherein the polyfunctional acrylic monomer (B) is a bifunctional acrylic monomer represented by the following formula (6): [ka] (In formula (6), R 4 are each independently hydrogen or methyl; R 5 is a divalent organic group having 4 to 30 carbon atoms and having a fused cyclic hydrocarbon group, a polycyclic hydrocarbon group, or a monocyclic hydrocarbon group, nB are each independently an integer from 0 to 10. [9] R in the above formula (6) 5 is a group represented by any one of the following formulas (7) to (10): [ka] (In formulas (7) to (10), * represents a bond.)

[0012]

[10] The composition further contains a photopolymerization initiator (D) in an amount of 5 to 15% by weight based on 100% by weight of the composition. [ The photocurable composition according to any one of items [1] to [9].

[11] Viscosity at 25°C is 1 to 100 mPa s. [ The photocurable composition according to any one of items [1] to

[10] .

[12] The composition has a hydroxyl value of 5 to 40 mgKOH / g. [ The photocurable composition according to any one of items [1] to

[11] .

[0013]

[13] An ink-jet ink composition comprising the photocurable composition according to any one of [1] to

[12] .

[14] An actinic ray-curable ink composition comprising the ink-jet ink composition according to

[13] .

[15] A cured product obtained by photocuring the photocurable composition according to any one of [1] to

[12] .

[16] A cured product obtained by photocuring the photocurable composition according to any one of [1] to

[12] and then thermally curing the composition.

[17] An electronic component comprising the cured product according to

[15] or

[16] . Effect of the Invention

[0014] In the photocurable composition of the present invention, the hydroxyl value of the composition containing the monofunctional acrylic monomer (A) and the polyfunctional acrylic monomer (B) is adjusted to 1 to 100 mgKOH / g by using the hydroxyl value regulator (C), and therefore the cured product formed from the photocurable composition has good resistance to ion migration. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The photocurable composition of the present invention (hereinafter also referred to as "composition") contains a monofunctional acrylic monomer (A), a polyfunctional acrylic monomer (B) and a hydroxyl value regulator (C). Hereinafter, these are also referred to as component (A), component (B) and component (C) as appropriate.

[0016] In the present invention, the hydroxyl value of the composition containing the components (A) and (B) is adjusted to 1 to 100 mgKOH / g by using the hydroxyl value adjuster (C), so that it is possible to form a cured product that is excellent in dischargeability and photocurability when used as an inkjet ink, and is also excellent in heat resistance, adhesion to a substrate, particularly a silicon substrate or a glass substrate, or a substrate on which a conductor such as a metal wiring or an electrode is formed, and ion migration resistance. From the viewpoint of obtaining a cured product with excellent ion migration resistance, the hydroxyl value of the composition is more preferably 2 to 40 mgKOH / g, and even more preferably 5 to 40 mgKOH / g. In this specification, the numerical range "A to B" is "A or more and B or less".

[0017] From the viewpoint of adjusting the hydroxyl value of the composition with the hydroxyl value adjuster (C) and forming a cured product having excellent resistance to ion migration, the hydroxyl value of each of the components (A) and (B) is preferably 100 mgKOH / g or less, more preferably 10 mgKOH / g or less, and even more preferably 0 mgKOH / g.

[0018] [Monofunctional acrylic monomer (A)] The composition of the present invention contains 40 to 80% by weight of the monofunctional acrylic monomer (A) relative to 100% by weight of the sum of the weights of the components of the composition.

[0019] From the viewpoints of improving the ejection properties when used as an ink and forming a cured product that is excellent in a well-balanced manner in heat resistance, adhesion to a substrate, ion migration resistance, and the like, the content of component (A) is preferably 40 to 80 wt %, and more preferably 50 to 75 wt %, relative to 100 wt % of the composition.

[0020] From the viewpoints of improving heat resistance, adhesion to a substrate, particularly a glass substrate, a silicon substrate, or a substrate having a conductor such as a metal wiring or an electrode formed thereon, and ion migration resistance, it is preferred that the monofunctional acrylic monomer (A) contains a (meth)acrylate having one or more groups selected from the group consisting of a fused cyclic hydrocarbon group, a polycyclic hydrocarbon group, and a monocyclic hydrocarbon group.

[0021] In this specification, "(meth)acrylate" is used to indicate both or either of acrylate and methacrylate, and "(meth)acryloyl" is used to indicate both or either of acryloyl and methacryloyl.

[0022] [Monofunctional acrylic monomer having a condensed cyclic hydrocarbon group or a polycyclic hydrocarbon group (a-1)] The monofunctional acrylic monomer (a-1) having a fused cyclic hydrocarbon group or a polycyclic hydrocarbon group is not particularly limited, but is preferably a monofunctional acrylic monomer containing an organic group having 7 to 50 carbon atoms and having a fused cyclic hydrocarbon group or a polycyclic hydrocarbon group, and more preferably a monofunctional acrylic monomer containing an organic group having 7 to 30 carbon atoms and having a fused cyclic hydrocarbon group or a polycyclic hydrocarbon group. The term "monofunctional acrylic monomer" refers to a monomer having one (meth)acryloyl group in one molecule.

[0023] In addition, the term "condensed cyclic hydrocarbon group" refers to a hydrocarbon group (composed of carbon atoms and hydrogen atoms) having two or more rings, which has at least one carbon atom that constitutes a certain ring and at the same time constitutes another ring, and the term "polycyclic hydrocarbon group" refers to a hydrocarbon group having two or more rings, in which a certain ring and another ring are bonded to each other via a single bond or an alkylene having 1 to 10 carbon atoms.

[0024] Furthermore, the term "an organic group having 7 to 50 carbon atoms and having a fused cyclic hydrocarbon group or a polycyclic hydrocarbon group" refers to, for example, an organic group other than a (meth)acryloyl group in the compound represented by the formula (1). A repeating units and R 2 The term "group" refers to a group containing the following:

[0025] As the monomer (a-1), it is preferable to use the compound represented by the formula (1) above, since a cured product having excellent heat resistance, adhesion to a substrate, and ion migration resistance can be obtained.

[0026] In the formula (1), R 2 is a monovalent organic group having 4 to 30 carbon atoms and having a fused cyclic hydrocarbon group or a polycyclic hydrocarbon group, preferably a non-polar monovalent organic group having 4 to 30 carbon atoms and having a fused cyclic hydrocarbon group or a polycyclic hydrocarbon group, more preferably a group represented by any one of the above formulas (2) to (5). A is preferably 0 or 1.

[0027] In the formulas (2) to (5), R 3 is preferably hydrogen. In addition, * is a bond and bonds to O- at the right end of the formula (1).

[0028] The monomer (a-1) is preferably at least one compound selected from the following compound group (I). [ka]

[0029] Among these, in consideration of the adhesion to the substrate, heat resistance, and ion migration resistance of the resulting cured product, the following compounds (11) to (20) are more preferable, and compounds (11) and (17) are even more preferable. [ka]

[0030] The monomer (a-1) may be one compound selected from the above-mentioned compounds, or may be a mixture of two or more of these. A mixture of compounds (11) and (17) is preferred, and when both are used in combination, the weight ratio of compound (11):compound (17) is preferably 5:10 to 10:5, more preferably 7:10 to 10:7, and even more preferably 9:10 to 10:9.

[0031] The monomer (a-1) may be a compound produced by a known method, or may be dicyclopentanyl acrylate (trade name: Fancryl FA-513AS, Hitachi Chemical Co., Ltd.), dicyclopentanyl methacrylate (trade name: Fancryl FA-513M, Hitachi Chemical Co., Ltd.), dicyclopentenyl acrylate (trade name: Fancryl FA-511AS, Hitachi Chemical Co., Ltd.), dicyclopentenyl methacrylate (trade name: Fancryl FA-51 ... Commercially available products such as cyclopentenyloxyethyl acrylate (trade name: Fancryl FA-512AS, Hitachi Chemical Co., Ltd.), dicyclopentenyloxyethyl methacrylate (trade name: Fancryl FA-512M, Hitachi Chemical Co., Ltd.), isobornyl acrylate (trade name: IB-XA, Kyoeisha Chemical Co., Ltd.), isobornyl methacrylate (trade name: IBXMA, Kyoeisha Chemical Co., Ltd.), and 1-adamantyl methacrylate (trade name: Adamantate M-104, Idemitsu Kosan Co., Ltd.) may also be used.

[0032] [Monofunctional polymerizable monomer having a monocyclic hydrocarbon group (a-2)] The term "monocyclic hydrocarbon group" refers to a hydrocarbon group having one ring (including an aromatic ring). The monomer (a-2) may be a compound produced by a known method, or a commercially available product such as benzyl acrylate, cyclohexyl acrylate (product name: V#155, Osaka Organic Chemical Industry Co., Ltd.), or cyclohexyl methacrylate (product name: Light Ester CH, Kyoeisha Chemical Co., Ltd.) may be used.

[0033] [Polyfunctional acrylic monomer (B)] The composition of the present invention contains 10 to 30% by weight of the polyfunctional acrylic monomer (B) relative to 100% by weight of the composition. The "polyfunctional acrylic monomer" refers to a monomer having two or more (meth)acryloyl groups in one molecule.

[0034] Specific examples of the monomer (B) include tricyclodecane dimethanol di(meth)acrylate, bisphenol F ethylene oxide modified di(meth)acrylate, bisphenol A ethylene oxide modified di(meth)acrylate, isocyanuric acid ethylene oxide modified di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, dipentaerythritol di(meth)acrylate, and pentaerythritol di(meth)acrylate. Monostearate, trimethylolpropane di(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate, 1,4-cyclohexanedimethanol di(meth)acrylate, 2-n-butyl-2-ethyl-1,3-propanediol di(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylolpropane tri(meth)acrylate, ethylene oxide modified trimethylolpropane tri(meth)acrylate, propylene oxide modified trimethylolpropane tri(meth)acrylate, epichlorohydrin modified trimethylolpropane tri(meth)acrylate, glycerin tri(meth)acrylate, ethylene oxide modified glycerin tri(meth)acrylate, propylene oxide-modified glycerin tri(meth)acrylate, epichlorohydrin-modified glycerin tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, diglycerin tetra(meth)acrylate, caprolactone-modified dipentaerythritol hexa(meth)acrylate, ethylene oxide-modified phosphate tri(meth)acrylate, tris[(meth)acryloxyethyl]isocyanurate, caprolactone-modified tris[(meth)acryloxyethyl]isocyanurate, and the compound represented by formula (6).

[0035] From the viewpoint of improving the ion migration resistance of the cured product formed from the composition, R 5 is preferably a group represented by any one of the formulas (7) to (10), and more preferably a group represented by the formula (7). B is preferably 0 or 1. The monomer (B) may be one compound selected from the above-mentioned compounds, or may be a mixture of two or more of these compounds.

[0036] In the composition of the present invention, the content of the monomer (B) is preferably 10 to 50% by weight, more preferably 13 to 30% by weight, and even more preferably 15 to 25% by weight, relative to 100% by weight of the composition, since a composition with excellent photocurability can be obtained, and a cured product with a good balance of heat resistance, adhesion to a substrate, and ion migration resistance can be obtained.

[0037] [Hydroxyl value regulator (C)] The composition of the present invention contains a hydroxyl value adjuster (C). Here, the hydroxyl value adjuster (C) is a compound having a hydroxyl value different from that of the components (A) and (B), and is preferably a compound having a hydroxyl value higher than that of the components (A) and (B). The difference between the hydroxyl value of the component (C) and the hydroxyl value of the component (A) is preferably 100 to 300 mgKOH / g or less, more preferably 150 to 250 mgKOH / g or less, and even more preferably 160 to 200 mgKOH / g or less. The difference between the hydroxyl value of the component (C) and the hydroxyl value of the component (B) is preferably 100 to 300 mgKOH / g or less, more preferably 150 to 250 mgKOH / g or less, and even more preferably 160 to 200 mgKOH / g or less. The hydroxyl value adjuster (C) may be used as a mixture of one or more kinds.

[0038] The composition of the present invention is prepared by, for example, mixing a monofunctional acrylic monomer (A) having no hydroxyl group and a polyfunctional acrylic monomer (B) having no hydroxyl group with a hydroxyl value adjuster (C) having a hydroxyl group to adjust the hydroxyl value of the entire composition. In this case, from the viewpoint of forming a cured product having good ion migration resistance, the content of the hydroxyl value adjuster (C) is preferably 0.1 to 30% by weight, more preferably 0.3 to 25% by weight, and even more preferably 0.5 to 20% by weight, based on 100% by weight of the composition.

[0039] Since the hydroxyl value of the composition can be easily adjusted to a predetermined range with the above-mentioned preferred blending amount, the hydroxyl value of the hydroxyl value adjuster (C) is preferably 100 to 300 mgKOH / g, more preferably 150 to 250 mgKOH / g, and even more preferably 160 to 200 mgKOH / g.

[0040] From the viewpoint of forming a cured product having good resistance to ion migration, it is preferable that the hydroxyl value regulator (C) contains an acrylic oligomer or a (meth)acrylic monomer having a hydroxyl group. The hydroxyl value regulator (C) may contain only one of these, or two or more of them. The weight average molecular weight of the hydroxyl value regulator (C) is preferably 100 to 5000, more preferably 450 to 3000, and further preferably 700 to 1500. From the same viewpoint, the glass transition point (Tg) of the hydroxyl value regulator (C) is preferably 85°C or higher, and more preferably 90°C or higher.

[0041] Examples of the (meth)acrylic monomer having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, (Meth)acrylic acidExamples of such esters include monoesters with dihydric alcohols having 2 to 8 carbon atoms, ε-caprolactone-modified monoesters of (meth)acrylic acid and dihydric alcohols having 2 to 8 carbon atoms, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, 1,4-cyclohexanedimethanol monoacrylate (CHDMMA), and compounds in which some of the hydroxyl groups of a polyol having multiple hydroxyl groups have been reacted with (meth)acrylic acid to form an ester.

[0042] Compounds obtained by adding (meth)acrylic acid to the oxirane or oxetane ring of an epoxy compound having an oxirane or oxetane ring to form an ester may also be used as acrylic monomers having a hydroxyl group. Examples of these include Epoxy Ester M-600A, Epoxy Ester 40EM, Epoxy Ester 70PA, Epoxy Ester 200PA, Epoxy Ester 80MFA, Epoxy Ester 3002M(N), Epoxy Ester 3002A(N), Epoxy Ester 3000MK, and Epoxy Ester 3000A (manufactured by Kyoeisha Chemical Co., Ltd.), and (meth)acrylic acid adducts of the following epoxy compounds, etc. Epoxy compounds: "jER807" (epoxy equivalent: 160-175g / eq), "jER815", "jER825" (epoxy equivalent: 170-180g / eq), "jER827" (epoxy equivalent: 180-190g / eq), "jER828" (epoxy equivalent: 184-194g / eq), "jER190P", "jER191P", "jER1001" (epoxy equivalent: 450-500g / eq), "jER1002" (epoxy equivalent: 600-700g / eq), "jER1004" (epoxy equivalent: 875-975g / eq), "jER1004AF" (epoxy equivalent: 875-975g / eq), "jER1007" (epoxy equivalent: 175 0-2200g / eq), "jER1010" (epoxy equivalent 3000-5000g / eq), "jER157S70" (epoxy equivalent 200-220g / eq), "jER1032H60" (epoxy equivalent 163-175g / eq), "jER1256" (epoxy equivalent 7500-8500g / eq) (all of the above, manufactured by Mitsubishi Chemical Corporation), "Celloxide 2021P" (epoxy equivalent 128-145g / eq), "Celloxide 3000", "EHPE-3150" (epoxy equivalent 170-190g / eq), "EHPE-3150CE" (epoxy equivalent 147-157g / eq) (all of the above, manufactured by Daicel Corporation), "TECHMOREVG3101L (product name, manufactured by Printec Co., Ltd., epoxy equivalent weight 210g / eq), HP7200 (epoxy equivalent weight 254-264g / eq), HP7200H (epoxy equivalent weight 272-284g / eq), HP7200HH (epoxy equivalent weight 274-286g / eq) (all product names, manufactured by DIC Co., Ltd.), NC-3000 (epoxy equivalent weight 265-285g / eq), NC-3000H (epoxy equivalent weight 280-300g / eq), EOCN-102S (epoxy equivalent weight 205-217g / eq), EOCN-103S (epoxy equivalent weight 209-219g / eq), EOCN-104S (epoxy equivalent weight 213-223g / eq), EPPN-501H (epoxy Equivalent weight 162~172g / eq), "EPPN-501HY" (Epoxy equivalent weight 163~175g / eq), "EPPN-502H" (Epoxy equivalent weight 158~178g / eq) , "EPPN-201" (epoxy equivalent: 180-200g / eq) (product name above, manufactured by Nippon Kayaku Co., Ltd.), "TEP-G" (epoxy equivalent: 160-180g / eq) (product name above) name, manufactured by Asahi Yukizai Co., Ltd.), "MA-DGIC (epoxy equivalent: 140 g / eq)", "DA-MGIC" (epoxy equivalent: 265 g / eq), "TG-G" (epoxy equivalent: 92 g / eq) (trade name, manufactured by Shikoku Kasei Kogyo Co., Ltd.), "TEPIC-VL" (epoxy equivalent: 125~145 g / eq) (trade name, manufactured by Nissan Chemical Industries, Ltd.), "NANOPOX" C620" (product name, manufactured by EVONIK, epoxy equivalent weight approximately 220g / eq), "ADEKA RESIN EP-4088S" (product name, manufactured by ADEKA Corporation, epoxy equivalent weight 170g / eq), N,N,N',N'-tetraglycidyl-m-xylylenediamine, 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane, N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenylmethane, γ-glycidoxypropyltrimethoxysilane (epoxy equivalent weight 194g / eq), γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltriethoxysilane. A (meth)acrylic acid adduct of an epoxy compound represented by the following formula (21): 6is a group represented by any one of the formulas (7) to (10), and n C are each independently an integer of 0 to 10. [ka]

[0043] [Photopolymerization initiator (D)] The composition of the present invention may further contain a photopolymerization initiator (D). The photopolymerization initiator may be any compound capable of initiating polymerization of the monomer components contained in the composition of the present invention and generating radicals upon irradiation with ultraviolet light, visible light, electromagnetic waves, etc., and any commonly used compound may be used. Specific examples of the photopolymerization initiator include benzophenone, Michler's ketone, 4,4'-bis(diethylamino)benzophenone, xanthone, thioxanthone, isopropylxanthone, 2,4-diethylthioxanthone, 2-ethylanthraquinone, acetophenone, 2-hydroxy-2-methylpropiophenone, 2-hydroxy-2-methyl-4'-isopropylpropiophenone, 1-hydroxycyclohexylphenyl ketone, isopropyl benzoin ether, isobutyl benzoate, and the like. Zoin ether, 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1,1′-(methylene-di-4,1-phenylene)bis(2-hydroxy-2-methyl-1-propanone), camphorquinone, benzanthrone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)butan-1-one, 2-benzyl-2-dimethylamino Ethylamino-1-(4-morpholinophenyl)-butanone-1,4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, 4,4′-di(tert-butylperoxycarbonyl)benzophenone, 3,4,4′-tri(tert-butylperoxycarbonyl)benzophenone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2-(4′-methoxystyryl)-4,6-bis(trichloromethyl)-s-triazine, 2-(3′,4′ -dimethoxystyryl)-4,6-bis(trichloromethyl)-s-triazine, 2-(2',4'-dimethoxystyryl)-4,6-bis(trichloromethyl)-s-triazine, 2-(2'-methoxystyryl)-4,6-bis(trichloromethyl)-s-triazine, 2-(4'-pentyloxystyryl)-4,6-bis(trichloromethyl)-s-triazine, 4-[pN,N-di(ethoxycarbonylmethyl)]-2,6-di(trichloromethyl)-s-triazine, 1,3-Bis(trichloromethyl)-5-(2'-chlorophenyl)-s-triazine, 1,3-bis(trichloromethyl)-5-(4'-methoxyphenyl)-s-triazine, 2-(p-dimethylaminostyryl)benzoxazole, 2-(p-dimethylaminostyryl)benzthiazole, 2-mercaptobenzothiazole, 3,3'-carbonylbis(7-diethylaminocoumarin), 2-(o-chlorophenyl)-4,4',5,5' -Tetraphenyl-1,2'-biimidazole, 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetrakis(4-ethoxycarbonylphenyl)-1,2'-biimidazole, 2,2'-bis(2,4-dichlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, 2,2'-bis(2,4-dibromophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, 2,2'-biimidazole Bis(2,4,6-trichlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole, 3-(2-methyl-2-dimethylaminopropionyl)carbazole, 3,6-bis(2-methyl-2-morpholinopropionyl)-9-n-dodecylcarbazole, bis(η5-2,4-cyclopentadiene-1-yl)-bis(2,6-difluoro-3-(1H-pyrrol-1-yl)-phenyl)titanium, 3,3',4, 4'-Tetra(tert-butylperoxycarbonyl)benzophenone, 3,3',4,4'-Tetra(tert-hexylperoxycarbonyl)benzophenone, 3,3'-Di(methoxycarbonyl)-4,4'-Di(tert-butylperoxycarbonyl)benzophenone, 3,4'-Di(methoxycarbonyl)-4,3'-Di(tert-butylperoxycarbonyl)benzophenone, 4,4'-Di(methoxycarbonyl)-3,3'-di(tert-butylperoxycarbonyl)benzophenone, etc. Commercially available products include, for example, BASF product names: Irgacure 379EG, Irgacure 127, Irgacure 184, and IGM Resins B.V. product names: Omnirad 379EG, Omnirad 127, Omnirad 184, etc. Among these, 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)butan-1-one is preferred.

[0044] From the viewpoint of forming a cured product having good resistance to ion migration, the photopolymerization initiator (D) is preferably 5 to 15% by weight, more preferably 7 to 12% by weight, based on 100% by weight of the composition. The photopolymerization initiator (D) may be a single compound or a mixture of two or more compounds.

[0045] [Inkjet composition, active energy ray curable ink composition] When the composition of the present invention is used as a composition for inkjet recording, from the viewpoint of achieving good dischargeability, the viscosity at 25° C. is preferably from 1 to 100 mPa·s, and more preferably from 3 to 70 mPa·s.

[0046] The present invention can also be embodied as an ink-jet ink composition containing the composition of the present invention, or an active energy ray curable ink composition containing the ink-jet ink composition. Here, the active energy ray refers to an energy ray capable of decomposing a compound that generates an active species to generate an active species. Examples of such active energy ray include light energy rays such as visible light, ultraviolet light, infrared light, X-rays, α-rays, β-rays, γ-rays, and electron beams.

[0047] In order to improve various properties, the composition of the present invention may contain other components such as a flame retardant, a resin containing a phenolic hydroxyl group, a melamine resin, an epoxy compound, an oxetane compound, a curing agent, a surfactant, a colorant, a polymerization inhibitor, and a solvent, within a range that does not impair the effects of the present invention.

[0048] [Cured product] The cured product of the present invention can be obtained by photocuring the composition of the present invention. When the composition of the present invention is used as an inkjet ink, a cured product can be produced by a method including the following steps 1 and 2. (Step 1) A step of applying the composition of the present invention onto a substrate by an inkjet method to form a coating film. (Step 2) A step of irradiating the coating film obtained in step 1 with light to harden the coating film and form a hardened product on the substrate.

[0049] The inkjet method is not particularly limited, and any known inkjet method can be used. The substrate is not particularly limited as long as it can be coated with the ink of the present invention, and the shape of the substrate is not limited to a flat plate, and may be curved, etc.

[0050] In addition, the substrate is not particularly limited, but examples thereof include polyester resin substrates such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); polyolefin resin substrates such as polyethylene and polypropylene; organic polymer films such as polyvinyl chloride, fluororesin, acrylic resin, polyamide, polycarbonate, and polyimide; cellophane; metal foil; laminated films of polyimide and metal foil; paper that has been sealed with glassine paper, parchment paper, polyethylene, clay binder, polyvinyl alcohol, starch, or carboxymethyl cellulose (CMC) that has a sealing effect; silicon substrates; and glass substrates.

[0051] By using the inkjet method, the ink of the present invention can be easily applied in a predetermined pattern, and a uniform pattern can be formed on a large substrate.

[0052] The temperature when ejected from the inkjet coating device is preferably 10 to 120° C. The viscosity of the ink of the present invention at this temperature is preferably 1 to 30 mPa·s, more preferably 2 to 25 mPa·s, and even more preferably 3 to 20 mPa·s.

[0053] When using ink with a viscosity of more than 30 mPa s at 25°C, more stable ejection can be achieved by heating the inkjet head to reduce the viscosity of the ink during ejection. When jetting by heating the inkjet head, the heating temperature is preferably 40 to 120°C. When heating the inkjet head, it is preferable to use ink that does not contain a solvent.

[0054] The thickness of the resulting coating film may be appropriately selected depending on the desired application, but is preferably 1 to 20 μm, and more preferably 5 to 15 μm.

[0055] When irradiating with ultraviolet light, visible light, or the like, the exposure dose may be appropriately adjusted depending on the composition of the composition of the present invention. When measured using a UV monitor manufactured by Opsytec ("UV-Pad", wavelength: UV-A (315-400 nm)), the exposure dose is 100 to 10,000 mJ / cm. 2 The preferred range is 150 to 5000 mJ / cm 2 More preferably, 180 to 3000 mJ / cm 2 More preferably, the range is 200 to 2000 mJ / cm 2 The wavelength of the ultraviolet light or visible light to be irradiated is preferably from 200 to 500 nm, and more preferably from 300 to 450 nm.

[0056] When irradiating light, an exposure machine may be used. The exposure machine is preferably equipped with a UV-LED lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a metal halide lamp, a halogen lamp, a black light lamp, or the like, and is a device that irradiates ultraviolet rays, visible light, or the like in the range of 200 to 500 nm.

[0057] If necessary, the product cured by irradiation with light may be further heated and baked. A stronger cured product can be obtained by heating and baking at 80 to 250° C. for 10 to 60 minutes.

[0058] The thickness of the cured product of the present invention may be appropriately selected depending on the desired application, but is preferably 1 to 20 μm, and more preferably 5 to 15 μm.

[0059] From the viewpoint of producing a highly reliable electronic circuit board, the cured product of the present invention preferably has a glass transition temperature of 85° C. or higher, more preferably 90 to 150° C., as measured using DMS6000 (Hitachi High-Technologies Corporation). As a reliability test for electronic circuit boards, a voltage application insulation resistance test (hereinafter referred to as ion migration resistance test) in a constant temperature and humidity environment may be performed. In the ion migration resistance test, a specific voltage is applied for a specific time in a specific constant temperature and humidity environment, and the presence or absence of abnormality in the resistance value at that time is confirmed. In particular, evaluation is often performed at high temperatures of 85 to 130° C., and therefore, in order to obtain a highly reliable electronic circuit board, it is desirable for the glass transition temperature of the cured product to be in the above range.

[0060] The cured product of the present invention is a cured product excellent in heat resistance, adhesion to substrates, and ion migration resistance, and is therefore suitable for use as protective films and insulating films in display elements such as liquid crystal display elements and EL display elements, and in electronic circuit boards such as printed wiring boards, flexible wiring boards, semiconductor package substrates, and solar cell substrates. Furthermore, the cured product of the present invention is suitable for use as coverlay films and solder resists that protect conductors such as metal wiring and electrodes that form a predetermined circuit pattern.

[0061] [Electronic components] The electronic component of the present invention preferably includes the cured product of the present invention and is produced by a method including the steps 1 and 2. The cured product of the present invention has excellent heat resistance, adhesion to a substrate, ion migration resistance, etc., and therefore the electronic component of the present invention has excellent electrical properties and long-term reliability, etc. EXAMPLES

[0062] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[0063] The following components were used in the Examples and Comparative Examples. The following abbreviations are used to indicate each component as appropriate. [Monofunctional acrylic monomer (A)] FA-513AS: dicyclopentanyl acrylate (trade name: Fancryl FA-513AS, Hitachi Chemical Co., Ltd., hydroxyl value 0 mg KOH / g, homopolymer glass transition point (Tg) 120°C) IB-XA: Isobornyl acrylate (product name: IB-XA; Kyoeisha Chemical Co., Ltd., hydroxyl value 0 mg KOH / g, Tg 97°C) THFA; Tetrahydrofurfuryl acrylate (hydroxyl value 0 mg KOH / g, Tg-10°C) FX-AO-MA: Methyl 2-allyloxymethyl acrylate (product name: FX-AO-MA, Nippon Shokubai Co., Ltd., hydroxyl value 0 mg KOH / g, Tg 84°C) FA-BZA: Benzyl acrylate (hydroxyl value 0mgKOH / g, Tg 6℃)

[0064] [Polyfunctional acrylic monomer (B)] IRR214-K; Tricyclodecane dimethanol diacrylate (hydroxyl value 0mgKOH / g, Tg190℃) M208; Bisphenol F ethylene oxide modified (n≒2) diacrylate (hydroxyl value 0mgKOH / g, Tg75℃)

[0065] [Hydroxyl value regulator (C)] OT-2503; Acrylic oligomer (Aronix OT-2503; product name, Toa Gosei Co., Ltd., weight average molecular weight 1000, hydroxyl value 172 mg KOH / g, Tg 94°C) Bifunctional monomer A: dicyclopentanyl diglycidyl ether acrylic acid adduct (weight average molecular weight 452.54, hydroxyl value 247.98 mgKOH / g) 3000A: Bisphenol A diglycidyl ether acrylic acid adduct (Epoxy ester 3000A, Kyoeisha Chemical Co., Ltd., weight average molecular weight 484.55, hydroxyl value 231.60 mgKOH / g) 4HBA; 4-hydroxybutyl acrylate (hydroxyl value 389 mg KOH / g, Tg-32°C) M305: Pentaerythritol triacrylate and pentaerythritol tetraacrylate (Aronix M305; trade name, Toagosei Co., Ltd., weight average molecular weight 323, hydroxyl value 116 mgKOH / g, Tg 107°C)

[0066] [Photopolymerization initiator (D)] Irg379; 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)butan-1-one (IRGACURE379; trade name, BASF Japan Ltd.)

[0067] [Example 1] <Preparation of Photocurable Composition> 35 g of FA-513AS and 35 g of IB-XA as monofunctional acrylic monomers (A), 20 g of IRR214-K as polyfunctional (bifunctional) acrylic monomers (B), 10 g of OT-2503 as hydroxyl value regulator (C), and 10 g of Irg379 as photopolymerization initiator (D) were mixed to obtain a solution, which was then filtered through a membrane filter (Nihon Entegris Co., Ltd.) made of ultra-high molecular weight polyethylene (hydrophobic) with a pore size of 0.2 μm to obtain a filtrate (used as a photocurable composition, "inkjet ink 1"). The viscosity of the photocurable composition at 25°C was measured using an E-type viscometer (Toki Sangyo Co., Ltd. TV-22, the same applies below), and was found to be 36.2 mPa·s.

[0068] <Formation of hardened product> Inkjet ink 1 was poured into an inkjet cartridge DMC-11610 (manufactured by FUJIFILM), which was then attached to an inkjet device (DMP-2831, manufactured by FUJIFILM). The inkjet ink was then sprayed onto a flexible copper-clad laminate (manufactured by Connectec Japan Co., Ltd., hereafter referred to as the Cu substrate) under the following conditions: ejection voltage (piezoelectric voltage) 17 to 25 V, head temperature 32 to 70° C., drive frequency 5 kHz, and number of applications 1. Side A 3 cm square pattern was drawn on a substrate with opposing comb-shaped electrode patterns (manufactured by Connectec Japan Co., Ltd.) to cover the overlapping portions of the comb-shaped electrodes.

[0069] The patterned Cu substrate and the substrate with the opposing comb-shaped electrode pattern were irradiated with 5000 mJ / cm2 ultraviolet light with a wavelength of 365 nm using a UV-LED lamp "ASM1503NM-UV-LED" (manufactured by Asumi Giken Co., Ltd., lamp wavelength: 365 nm). 2 The pattern was photocured by irradiating it with a UV exposure amount (measured with a UV monitor ("UV-Pad") manufactured by Opsytec, wavelength: UV-A (315-400 nm)) and then heated and baked at 175°C for 60 minutes in a clean oven DT-610 (manufactured by Yamato Scientific Co., Ltd.) to obtain a Cu substrate (Cu substrate 1) on which a cured material with a thickness of 10 μm was formed, and a substrate 1 with an opposing comb-shaped electrode pattern was obtained.

[0070] The film thickness of the cured product was determined by measuring the film thickness of the cured product on Cu for Cu substrate 1 on which the cured product was formed, and by measuring the film thickness of the cured product on the opposing interdigital electrode for substrate 1 with opposing interdigital electrode pattern on which the cured product was formed, using a laser microscope VK-X100 (manufactured by Keyence Corporation).

[0071] <Preparation of samples for evaluating ion migration resistance (IMG samples)> An electromagnetic wave shielding film SF-PC5900-C (manufactured by Tatsuta Electric Wire Co., Ltd.) was attached to a predetermined position of the opposing comb-shaped electrode pattern substrate 1 with the cured product placed thereon by hot pressing (3 MPa x 175°C x 3 minutes) to prepare IMG sample 1.

[0072] <Examples 2 to 14 and Comparative Examples 1 to 5> Inkjet inks 2 to 19 were prepared in the same manner as in Example 1, except that the components in Example 1 were changed to those shown in Tables 1 to 3. For inks 2 to 18 except for ink 19, IMG samples 2 to 18 and Cu substrates 2 to 18 were prepared.

[0073] <Evaluation method> <Evaluation of Inkjet Ink and Pattern-Shaped Cured Product> The inkjet inks 1 to 19 obtained above were evaluated for ejection property, photocurability, ion migration resistance, and adhesion to substrates and heat resistance (glass transition temperature) of the cured products. The test methods and evaluation criteria are as follows, and the evaluation results are shown in Tables 1 to 3. In the tables, the values ​​representing the contents of components (A), (B), (C) and (D) are all in percent by weight.

[0074] (Ion migration resistance test) The ion migration resistance of the IMG samples (1 to 18) obtained above was evaluated by the following method. The obtained IMG sample was connected to an ion migration tester MIG-87 (IMV Corporation) with wiring and placed inside a small environmental tester SH-641 (Espec Corporation). A DC voltage of 100 V was then applied for 100 hours in an environment of 85°C x 85% humidity.

[0075] (Evaluation Criteria) The above test was performed on four or two IMG samples, and after 100 hours of application, the resistance was 1×10 6 The samples that exhibited the above characteristics were determined to have passed the test. The resistance to ion migration was evaluated based on the number of samples that had passed the test. X / 4: Of the four IMG samples, X passed the test. X / 2: Of the two IMG samples, X passed the test.

[0076] (Ink ejection test) The ejection properties of the inks (1 to 19) obtained in each of the Examples and Comparative Examples were evaluated according to the following criteria. 〇: Good discharge from 12 or more consecutive nozzles △: Good discharge from consecutive nozzles 4 to 11 ×: Good discharge from 4 or fewer consecutive nozzles

[0077] (Wettability test) The patterns formed on the Cu substrates obtained in each of the Examples and Comparative Examples were visually observed for any irregularities in the patterns and any smears in the print, and the wettability of the ink was evaluated. The evaluation criteria were as follows: ○: The specified pattern is printed and no print lines are visible △: The specified pattern is printed, but printing streaks are visible. ×: There are parts of the specified pattern that are not printed.

[0078] (Adhesion: Cross-cut peel test) The cured product obtained on the Cu substrate (1-18) was cut into a square of 1 mm x 1 mm. shape( The specimen was cross-cut in a grid pattern to create 100 areas surrounded by the cuts. An adhesive peeling tape was applied over the areas, and the number of peeled areas was counted when the tape was peeled off. The results were evaluated according to the following evaluation criteria. The peeling tape used was Scotch #610 (product name, manufactured by 3M), 402N / 100mm (vertical direction). (Evaluation Criteria) ◎: Not even one area out of 100 peeled off ○: Missing area (peeled area) is 5% or less △: Missing area is more than 5% and less than 50% ×: Missing area exceeds 51%

[0079] [Table 1]

[0080] [Table 2]

[0081] [Table 3]

[0082] As shown in Tables 1 to 3, by using a composition containing OT-2503, bifunctional monomer A, or 3000A as the hydroxyl value adjuster (C), the ion migration resistance (hereinafter referred to as "IMG resistance"), wettability, and adhesion of the cured product were improved. From these results, it can be said that it is effective to set the hydroxyl value of the composition to 1 to 100 mgKOH / g in order to form a cured product with excellent adhesion and IMG resistance. The reason why the hydroxyl value of the composition affects the IMG resistance may be that the hydroxyl value adjuster (C) exerts some surfactant action and adjusts the balance between hydrophilicity and hydrophobicity to increase the wettability of the composition. In addition, the composition in Comparative Example 1, which had a hydroxyl value of more than 100 mgKOH / g, had low IMG resistance. This indicates that one of the reasons for this is that when the hydroxyl value of the composition is too high, the cured product absorbs too much water.

[0083] By using an acrylic oligomer as the hydroxyl value regulator (C), a cured product with high IMG resistance could be stably formed. When an acrylic oligomer was used, a cured product with high IMG resistance was obtained by making the content in the composition 1% by weight or more. However, since the viscosity of the composition increases as the content of the acrylic oligomer increases, it is preferable to make the hydroxyl value regulator (C) 25% by weight or less when used as an inkjet ink. In addition, when a (meth)acrylic monomer having a hydroxyl group was used, a cured product with high IMG resistance could be formed, similar to the acrylic oligomer.

[0084] It was found that even for cured products with similar wettability and adhesion, there are differences in IMG resistance. From the viewpoint of obtaining cured products with good IMG resistance, monofunctional acrylic monomers (A) and polyfunctional acrylic monomers (B) with condensed cyclic hydrocarbon groups or polycyclic hydrocarbon groups were preferable. This result is believed to be due to the fact that the adhesion of the cured products to inorganic substances such as Cu is improved by the cyclocyclic skeleton.

[0085] From the viewpoint of obtaining a cured product with good IMG resistance, it is preferable that the monofunctional acrylic monomer (A) has a homopolymer glass transition temperature (Tg) of 90°C or more. From the same viewpoint, when a bifunctional acrylic monomer is used as the polyfunctional acrylic monomer (B), it is preferable to mix it in an amount of 8% by weight or more of the composition. This result is considered to be due to the fact that the crosslink density of the cured product is increased by increasing the content of the bifunctional acrylic monomer. However, if the crosslink density is too high, the curing shrinkage may increase conversely, and the adhesion of the cured product may decrease, so it is preferable that the bifunctional acrylic monomer is 50% by weight or less of the composition. [Industrial Applicability]

[0086] The photocurable composition of the present invention can be used to form a cured product that has excellent adhesion and ion migration resistance to silicon substrates, glass substrates, polyimide substrates, and substrates having conductors such as metal wiring and electrodes formed thereon.

Claims

1. 40 to 80% by weight of a monofunctional acrylic monomer (A) based on 100% by weight of the composition; 10 to 50% by weight of a polyfunctional acrylic monomer (B) based on 100% by weight of the composition; A photocurable composition comprising: 0.1 to 30% by weight of a hydroxyl value regulator (C) based on 100% by weight of the composition, The monofunctional acrylic monomer (A) and the polyfunctional acrylic monomer (B) have a hydroxyl value of 0 mgKOH / g; The hydroxyl value of the hydroxyl value regulator (C) is 150 to 250 mgKOH / g; A photocurable composition, wherein the composition has a hydroxyl value of 1 to 100 mgKOH / g.

2. The hydroxyl value regulator (C) is 2. The photocurable composition according to claim 1, which has a weight average molecular weight of 100 to 5,000.

3. The polyfunctional acrylic monomer (B) is the polyfunctional acrylic monomer (B) (excluding acrylic oligomers, dicyclopentanyl diglycidyl ether acrylic acid adducts, and bisphenol A diglycidyl ether acrylic acid adducts), 2. The photocurable composition according to claim 1, wherein the hydroxyl value adjuster (C) is one or more selected from the group consisting of the acrylic oligomer, the dicyclopentanyl diglycidyl ether acrylic acid adduct, and the bisphenol A diglycidyl ether acrylic acid adduct.

4. The photocurable composition according to claim 1 or 2, wherein the hydroxyl value regulator (C) comprises an acrylic oligomer or a (meth)acrylic monomer having a hydroxyl group.

5. 2. The photocurable composition according to claim 1, wherein the monofunctional acrylic monomer (A) contains a (meth)acrylate having one or more groups selected from the group consisting of a fused cyclic hydrocarbon group, a polycyclic hydrocarbon group, and a monocyclic hydrocarbon group.

6. The photocurable composition according to claim 5 , wherein the monofunctional acrylic monomer (A) is a monofunctional acrylic monomer represented by the following formula (1): 【Chemistry 1】 (In formula (1), R 1 is hydrogen or methyl; R 2 is a monovalent organic group having 4 to 30 carbon atoms and having a fused cyclic hydrocarbon group, a polycyclic hydrocarbon group, or a monocyclic hydrocarbon group, n A is an integer from 0 to 10.

7. R in the formula (1) 2 The photocurable composition according to claim 6, wherein is a group represented by any one of the following formulas (2) to (5): 【Chemistry 2】 (In formulas (2) to (5), R 3 are each independently hydrogen or alkyl having 1 to 6 carbon atoms, and * is a bond.

8. The photocurable composition according to claim 7 , wherein the polyfunctional acrylic monomer (B) is a bifunctional acrylic monomer represented by the following formula (6): 【Chemistry 3】 (In formula (6), R 4 are each independently hydrogen or methyl; R 5 is a divalent organic group having 4 to 30 carbon atoms and having a fused cyclic hydrocarbon group, a polycyclic hydrocarbon group, or a monocyclic hydrocarbon group, n B are each independently an integer from 0 to 10.

9. R in the formula (6) 5 The photocurable composition according to claim 8, wherein is a group represented by any one of the following formulas (7) to (10): 【Chemistry 4】 (In formulas (7) to (10), * represents a bond.)

10. The photocurable composition according to any one of claims 1 to 9, further comprising a photopolymerization initiator (D) in an amount of 5 to 15% by weight based on 100% by weight of the composition.

11. The photocurable composition according to any one of claims 1 to 10, which has a viscosity at 25°C of 1 to 100 mPa·s.

12. The photocurable composition according to any one of claims 1 to 11, wherein the composition has a hydroxyl value of 5 to 40 mg KOH / g.

13. An ink-jet ink composition comprising the photocurable composition according to any one of claims 1 to 12.

14. An actinic ray-curable ink composition comprising the ink-jet ink composition according to claim 13.

15. A cured product obtained by photocuring the photocurable composition according to any one of claims 1 to 12.

16. A cured product obtained by photocuring the photocurable composition according to any one of claims 1 to 12 and then thermally curing the same.

17. An electronic part comprising the cured product according to claim 15 or 16.

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