JP2020152772A - Curable composition for inkjet printing, and cured product thereof and electronic component having cured product - Google Patents

Abstract

To provide a curable composition for inkjet printing with low viscosity that has excellent adhesion and HAST resistance.MEANS: A curable composition for inkjet printing contains (A) a thermosetting compound, (B) a cyclic siloxane compound having four or more epoxy groups, (C) a siloxane compound having one epoxy group, (D) a photocurable monomer, and (E) a photopolymerization initiator.SELECTED DRAWING: None

Description

The present invention relates to a curable composition for inkjet printing, and more particularly to a curable composition for inkjet printing having excellent adhesion and HAST resistance, a cured product thereof, and an electronic component having the cured product thereof.

The inkjet printing method used in the manufacture of electronic components such as printed wiring boards is to print a pattern directly on a substrate based on digital data using an inkjet printer and immediately cure it using energy rays such as UV. This is a technique capable of directly forming a desired cured pattern. Therefore, it is a method capable of efficient production as compared with the conventional method (photo development method or screen printing method). In addition, as another advantage, since the inkjet printing method is non-contact printing, it is easy to deal with uneven base materials and flexible base materials, and it can be applied to electronic parts such as printed wiring boards. Expected.

In addition, among the materials for printed wiring boards, the solder resist formed as the protective film of the outermost layer was patterned by the alkaline development method, but by applying the inkjet printing method, the exposure development process becomes unnecessary. It has the advantages of easy management of the production line and environmental friendliness.

International Publication No. 2013/146706

The curable composition for inkjet printing as described above needs to have a low viscosity so that droplets can be ejected in an inkjet printer. Then, in the technical field, further improvement of adhesion to a substrate and HAST resistance (resistance to a highly accelerated life test) of a curable composition for inkjet printing is required. In particular, in semiconductor insulating protective film applications, further improvement in adhesion and HAST resistance on silicon wafers is required.

Therefore, an object of the present invention is to provide a low-viscosity curable composition for inkjet printing, which has excellent adhesion to a substrate and HAST resistance. Another object of the present invention is to provide a curable composition for inkjet printing having excellent adhesion and HAST resistance on a silicon wafer, particularly for semiconductor insulating protective film applications.

Another object of the present invention is to provide a cured product obtained by curing the curable composition for inkjet printing, and an electronic component having the cured product.

The above purpose is
(A) Thermosetting compound,
(B) Cyclic siloxane compound having 4 or more epoxy groups,
(C) A siloxane compound having one epoxy group,
(D) Photopolymerizable monomer, and (E) Photopolymerization initiator,
Achieved by a curable composition for inkjet printing, including.

By using the above two types of siloxane compounds in combination, a curable composition for inkjet printing that achieves low viscosity and is excellent in both adhesion on a silicon wafer and HAST resistance can be obtained, especially in semiconductor insulating protective film applications. It has been found by the present inventor.

The curable composition for inkjet printing of the present invention preferably has a viscosity at 50 ° C. of 5 mPa · s or more and 15 mPa · s or less.

Further, the above object is achieved by a cured product of the curable composition for inkjet printing of the present invention and an electronic component having the cured product.

According to the present invention, it is possible to provide a low-viscosity curable composition for inkjet printing, which is excellent in adhesion on a silicon wafer and HAST resistance, particularly in semiconductor insulating protective film applications. Therefore, the electronic component having the cured product of the curable composition for inkjet printing of the present invention is excellent in reliability and durability.

Hereinafter, the present invention will be described in detail. As described above, the curable composition for inkjet printing of the present invention comprises (A) a thermosetting compound, (B) a cyclic siloxane compound having four or more epoxy groups, and (C) a siloxane having one epoxy group. It contains a compound, (D) a photocurable monomer, and (E) a photopolymerization initiator. Hereinafter, each component will be described in detail.

<(A) Thermosetting compound>
Examples of the thermosetting compound (A) include amino resins such as melamine, isocyanate, melamine resin, benzoguanamine resin, melamine derivative, and benzoguanamine derivative, blocked isocyanate compounds, cyclocarbonate compounds, and thermosetting compounds having a cyclic (thio) ether group. , Known thermosetting resins such as bismaleimide and carbodiimide resins. Above all, it is preferable to use a melamine or a blocked isocyanate compound because it has excellent heat resistance. One of these thermosetting compounds may be used alone, or two or more thereof may be used in combination.

A thermosetting compound having a plurality of cyclic (thio) ether groups in a molecule is a compound having a plurality of any one or two types of 3, 4, or 5-membered ring cyclic (thio) ether groups in the molecule. Yes, for example, a compound having a plurality of epoxy groups in the molecule, that is, a polyfunctional epoxy compound, a compound having a plurality of oxetanyl groups in the molecule, that is, a polyfunctional oxetane compound, a compound having a plurality of thioether groups in the molecule, that is, Examples include episulfide resins.

Examples of the polyfunctional epoxy compound include epoxidized vegetable oils such as ADEKA O-130P and ADEKA O-180A; jER828 manufactured by Mitsubishi Chemical Corporation, EHPE3150 manufactured by Dowell Chemical Corporation, and Epicron 840 manufactured by DIC Corporation. Epoxy YD-011 manufactured by Toto Kasei Co., Ltd. and D.D. E. R. 317, bisphenol A type epoxy resin such as Sumi-epoxy ESA-011 manufactured by Sumitomo Chemical Industries, Ltd. (Both are trade names); bisphenol F type epoxy resin such as hydroquinone type epoxy resin and YSLV-80XY manufactured by Nippon Steel & Sumikin Chemical Co., Ltd. , YSLV-120TE thioether type epoxy resin manufactured by Nippon Steel & Sumikin Chemical Co., Ltd .; jERYL903 manufactured by Mitsubishi Chemical Co., Ltd., Epicron 152 manufactured by DIC Co., Ltd., Epototo YDB-400 manufactured by Toto Kasei Co., Ltd., D.D. E. R. 542, Sumitomo Chemical Corporation's Sumi-Epoxy ESB-400, etc. (both are trade names) brominated epoxy resins; Mitsubishi Chemical Corporation's jER152, Dow Chemical Corporation's D.I. E. N. Novolak type such as EPICLONN-730 manufactured by 431DIC, Epototo YDCN-701 manufactured by Toto Kasei Co., EPPN-201 manufactured by Nippon Kayaku Co., Ltd., Sumi-epoxy ESCN-195X manufactured by Sumitomo Chemical Industry Co., Ltd. Epoxy resin; Biphenol novolac type epoxy resin such as NC-3000 manufactured by Nippon Kayaku Co., Ltd .; Epicron 830 manufactured by DIC, jER807 manufactured by Mitsubishi Chemical Co., Ltd., Epototo YDF-170, YDF-175, YDF-2004 manufactured by Toto Kasei Co., Ltd., etc. Bisphenol F type epoxy resin (both trade names); Hydrophobic bisphenol A type epoxy resin such as Epototo ST-2004 (trade name) manufactured by Toto Kasei Co., Ltd .; jER604 manufactured by Mitsubishi Chemical Co., Ltd., Epototo YH manufactured by Toto Kasei Co., Ltd. -434, glycidylamine type epoxy resin such as Sumi-epoxy ELM-120 manufactured by Sumitomo Chemical Industries (both trade names); hidden-in type epoxy resin; celloxide 2021 etc. manufactured by Daicel Chemical Industry Co., Ltd. (both trade names) Alicyclic epoxy resin; Trihydroxyphenylmethane type epoxy resin such as EPPN-501 (all trade names) manufactured by Nippon Kayaku Co., Ltd .; YL-6056, YX-4000, YL-6121 manufactured by Mitsubishi Chemical Co., Ltd. (all) Bixilenol type or biphenol type epoxy resin such as (trade name) or a mixture thereof; EBPS-200 manufactured by Nippon Kayaku Co., Ltd., EPX-30 manufactured by ADEKA, and bisphenol S type such as EXA-1514 (trade name) manufactured by DIC. Epoxy resin; Bisphenol A novolak type epoxy resin such as jER157S (trade name) manufactured by Mitsubishi Chemical Co., Ltd .; Tetraphenylol ethane type epoxy resin such as jERYL-931 manufactured by Mitsubishi Chemical Co., Ltd. (both trade names); Nissan Chemical Industry Co., Ltd. TEPIC, etc. (both trade names) heterocyclic epoxy resins; Diglycidyl phthalate resins such as Blemmer DGT manufactured by Nippon Oil & Fats Co., Ltd .; Tetraglycidyl xylenoyl ethane resins such as ZX-1063 manufactured by Toto Kasei Co., Ltd .; Nippon Steel Co., Ltd. Naphthalene group-containing epoxy resin such as ESN-190 manufactured by Kagaku Co., Ltd. and HP-4032 manufactured by DIC Co., Ltd .; Epoxy resin having a dicyclopentadiene skeleton such as HP-7200 manufactured by DIC Co., Ltd .; CP-50S, CP-50M manufactured by Nippon Yushi Co., Ltd., etc. Glycidyl methacrylate copolymer epoxy resin; further, a copolymerized epoxy resin of cyclohexyl maleimide and glycidyl methacrylate; epoxy-modified polybutadiene rubber derivative (for example, PB-3600 manufactured by Daicel Chemical Industry Co., Ltd.), CTBN Modified epoxy resins (for example, YR-102, YR-450 manufactured by Toto Kasei Co., Ltd.) and the like can be mentioned, but the present invention is not limited thereto. These epoxy resins can be used alone or in combination of two or more. Among these, a novolac type epoxy resin, a bixylenel type epoxy resin, a biphenol type epoxy resin, a biphenol novolac type epoxy resin, a naphthalene type epoxy resin, or a mixture thereof is particularly preferable.

Examples of the polyfunctional oxetane compound include bis [(3-methyl-3-oxetanylmethoxy) methyl] ether, bis [(3-ethyl-3-oxetanylmethoxy) methyl] ether, and 1,4-bis [(3-3). Methyl-3-oxetanylmethoxy) methyl] benzene, 1,4-bis [(3-ethyl-3-oxetanylmethoxy) methyl] benzene, (3-methyl-3-oxetanyl) methyl acrylate, (3-ethyl-3-3- Oxetane) methyl acrylate, (3-methyl-3-oxetanyl) methyl methacrylate, (3-ethyl-3-oxetanyl) methyl methacrylate and polyfunctional oxetane such as their oligomers or copolymers, as well as oxetane alcohol and novolak resin , Poly (p-hydroxystyrene), cardo-type bisphenols, calix arrayes, calix resorcinarenes, etherified products with a resin having a hydroxyl group such as silsesquioxane, and the like. In addition, a copolymer of an unsaturated monomer having an oxetane ring and an alkyl (meth) acrylate can also be mentioned.

In addition, (3-methyl-3-oxetanyl) methyl acrylate, (3-ethyl-3-oxetanyl) methyl acrylate, (3-methyl-3-oxetanyl) methyl methacrylate, (3-ethyl-3-oxetanyl) methyl methacrylate and the like. Since the monomer having both a radical polymerization site (methacryl group) and a cationic polymerization site (oxetanyl site) in the molecule is both a photocurable component and a thermosetting compound, it is subjected to two-step curing of photocuring and thermosetting. In some cases, it is preferably contained in the composition.

In addition to the polyfunctional oxetane compound, such components include, for example, ethoxylated bisphenol A diacrylate fat (product name, A-BPE-4, manufactured by Shin-Nakamura Chemical Industry Co., Ltd.), 4-hydroxybutyl acrylate glycidyl ether (product). Name, 4HBAGE, manufactured by Nihon Kasei Co., Ltd.), 3,4-epoxycyclohexylmethyl methacrylate (product name, Cyclomer M100, manufactured by Daicel Co., Ltd.) and the like.

Examples of the compound having a plurality of cyclic thioether groups in the molecule include bisphenol A type episulfide resin YL7000 manufactured by Mitsubishi Chemical Corporation. Further, using the same synthesis method, an episulfide resin in which the oxygen atom of the epoxy group of the novolak type epoxy resin is replaced with a sulfur atom can also be used.

Examples of amino resins such as melamine derivatives and benzoguanamine derivatives include methylol melamine compounds, methylol benzoguanamine compounds, methylol glycol uryl compounds and methylol urea compounds. Further, the alkoxymethylated melamine compound, the alkoxymethylated benzoguanamine compound, the alkoxymethylated glycol uryl compound and the alkoxymethylated urea compound have the methylol groups of the respective methylol melamine compound, methylol benzoguanamine compound, methylol glycol uryl compound and methylol urea compound. It is obtained by converting to an alkoxymethyl group. The type of the alkoxymethyl group is not particularly limited, and may be, for example, a methoxymethyl group, an ethoxymethyl group, a propoxymethyl group, a butoxymethyl group, or the like. In particular, a melamine derivative having a formalin concentration of 0.2% or less, which is friendly to the human body and the environment, is preferable.

Examples of these commercially available products include Cymel 300, 301, 303, 370, 325, 327, 701, and 266 (all manufactured by Mitsui Siana Mid), Nicarac Mx-750, and Mx-032. , Mx-270, Mx-280, Mx-290, Mx-706 (all manufactured by Sanwa Chemical Co., Ltd.) and the like. One of such thermosetting compounds may be used alone, or two or more thereof may be used in combination.

The isocyanate compound and the blocked isocyanate compound are compounds having a plurality of isocyanate groups or blocked isocyanate groups in one molecule. Examples of the compound having a plurality of isocyanate groups or blocked isocyanate groups in one molecule include polyisocyanate compounds and blocked isocyanate compounds. The blocked isocyanate group is a group in which the isocyanate group is protected by the reaction with the blocking agent and temporarily inactivated, and when heated to a predetermined temperature, the blocking agent dissociates and the isocyanate group is used. Is generated. By adding the polyisocyanate compound or the blocked isocyanate compound, the curability and the toughness of the obtained cured product can be improved.

As such a polyisocyanate compound, for example, aromatic polyisocyanate, aliphatic polyisocyanate or alicyclic polyisocyanate is used.

Specific examples of the aromatic polyisocyanate include 4,4'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, naphthalene-1,5-diisocyanate, o-xylylene diisocyanate, and the like. Examples thereof include m-xylylene diisocyanate and 2,4-tolylen dimer.

Specific examples of the aliphatic polyisocyanate include tetramethylene diisocyanate, hexamethylene diisocyanate, methylene diisocyanate, trimethylhexamethylene diisocyanate, 4,4-methylenebis (cyclohexylisocyanate) and isophorone diisocyanate.

Specific examples of the alicyclic polyisocyanate include bicycloheptane triisocyanate. In addition, the adduct form, burette form, isocyanurate form, etc. of the isocyanate compounds mentioned above can be mentioned.

As the blocked isocyanate compound, an addition reaction product of the isocyanate compound and the isocyanate blocking agent is used. Examples of the isocyanate compound capable of reacting with the blocking agent include the above-mentioned polyisocyanate compounds.

Examples of the isocyanate blocking agent include phenolic blocking agents such as phenol, cresol, xylenol, chlorophenol and ethylphenol; lactam blocking agents such as ε-caprolactam, δ-parellolactam, γ-butyrolactam and β-propiolactam; Active oxime blocking agents such as ethyl acetoacetate and acetylacetone; methanol, ethanol, propanol, butanol, amyl alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, propylene glycol monomethyl ether, benzyl Alcohol-based blocking agents such as ether, methyl glycolate, butyl glycolate, diacetone alcohol, methyl lactate and ethyl lactate; oxime-based blocking agents such as formaldehyde oxime, acetoaldoxime, acetoxime, methyl ethyl ketoxim, diacetyl monooxime and cyclohexane oxime. Mercaptan-based blocking agents such as butyl mercaptan, hexyl mercaptan, t-butyl mercaptan, thiophenol, methyl thiophenol, ethyl thiophenol; acid amide-based blocking agents such as acetate amide and benzamide; imides such as succinate imide and maleate imide. Examples thereof include amine-based blocking agents such as xylidine, aniline, butylamine, and dibutylamine; imidazole-based blocking agents such as imidazole and 2-ethylimidazole; imine-based blocking agents such as methyleneimine and propyleneimine.

The blocked isocyanate compound may be commercially available, for example, Sumijour BL-3175, BL-4165, BL-1100, BL-1265, Death Module TPLS-2957, TPLS-2062, TPLS-2078, TPLS-2117. , Desmotherm 2170, Desmotherm 2265 (all manufactured by Sumitomo Bayer Urethane), Coronate 2512, Coronate 2513, Coronate 2520 (all manufactured by Nippon Polyurethane Industry Co., Ltd.), B-830, B-815, B-846, B-870, Examples thereof include B-874, B-882 (all manufactured by Mitsui Takeda Chemical Co., Ltd.), TPA-B80E, 17B-60PX, E402-B80T (all manufactured by Asahi Kasei Chemicals Co., Ltd.) and the like. Sumijour BL-3175 and BL-4265 are obtained by using methyl ethyl oxime as a blocking agent. As such a compound having a plurality of isocyanate groups or blocked isocyanate groups in one molecule, one type may be used alone, or two or more types may be used in combination.

The blending amount of the thermosetting compound (A) is preferably 1 to 30% by mass, particularly preferably 3 to 25%, based on the mass of the curable composition for inkjet printing of the present invention. When the blending amount is 1% by mass or more, the toughness and heat resistance of the coating film are further improved. On the other hand, when it is 30% by mass or less, both properties such as heat resistance and injection property are excellent.

<(B) Cyclic siloxane compound having 4 or more epoxy groups (4 or more functional cyclic siloxane compound)>
In the present invention, (B) any cyclic siloxane compound having four or more epoxy groups (also referred to as "tetrafunctional or higher functional cyclic siloxane compound") is any compound having four or more epoxy groups and a cyclic siloxane structure. It may be something like.

（式中、Ｒ^１、Ｒ^３、Ｒ^５及びＲ^７は、エポキシ基含有基であり、Ｒ^２、Ｒ^４、Ｒ^６及びＲ^８は、それぞれ独立して、炭化水素基、好ましくは炭素原子数１〜３のアルキル基、特に好ましくはメチル基である。）

（式中、Ｒ^１、Ｒ^３、Ｒ^５、Ｒ^７及びＲ^９のうち４つまたは５つ全てが、エポキシ基含有基であり、エポキシ基含有基ではないＲ^１、Ｒ^３、Ｒ^５、Ｒ^７またはＲ^９が存在する場合は、それは炭化水素基、好ましくは炭素原子数１〜３のアルキル基であり、Ｒ^２、Ｒ^４、Ｒ^６、Ｒ^８及びＲ^１０は、それぞれ独立して、炭化水素基、好ましくは炭素原子数１〜３のアルキル基、特に好ましくはメチル基である。）

（式中、Ｒ^１、Ｒ^３、Ｒ^５、Ｒ^７、Ｒ^９及びＲ^１１のうち４つ、５つまたは６つ全てが、エポキシ基含有基であり、エポキシ基含有基ではないＲ^１、Ｒ^３、Ｒ^５、Ｒ^７、Ｒ^９またはＲ^１１が存在する場合は、それは炭化水素基、好ましくは炭素原子数１〜３のアルキル基であり、Ｒ^２、Ｒ^４、Ｒ^６、Ｒ^８、Ｒ^１０及びＲ^１２は、それぞれ独立して、炭化水素基、好ましくは炭素原子数１〜３のアルキル基、特に好ましくはメチル基である。） (B) Specific examples of the compound that can be used as a tetrafunctional or higher functional cyclic siloxane compound include the following compounds.

(In the formula, R ¹ , R ³ , R ⁵ and R ⁷ are epoxy group-containing groups, and R ² , R ⁴ , R ⁶ and R ⁸ are independent hydrocarbon groups, preferably carbon atoms. Alkyl groups of numbers 1 to 3, particularly preferably methyl groups.)

(In the formula, all four or five of R ¹ , R ³ , R ⁵ , R ⁷ and R ⁹ are epoxy group-containing groups and not epoxy group-containing groups R ¹ , R ³ , R ⁵ , If R ⁷ or R ⁹ is present, it is a hydrocarbon group, preferably an alkyl group with 1-3 carbon atoms, with R ² , R ⁴ , R ⁶ , R ⁸ and R ¹⁰ being independent of each other. , A hydrocarbon group, preferably an alkyl group having 1 to 3 carbon atoms, particularly preferably a methyl group.)

(In the formula, all four, five or six of R ¹ , R ³ , R ⁵ , R ⁷ , R ⁹ and R ¹¹ are epoxy group-containing groups and not epoxy group-containing groups R ¹ , If R ³ , R ⁵ , R ⁷ , R ⁹ or R ¹¹ are present, they are hydrocarbon groups, preferably alkyl groups with 1-3 carbon atoms, R ² , R ⁴ , R ⁶ , R ⁸ , R ¹⁰ and R ¹² are independently hydrocarbon groups, preferably alkyl groups having 1 to 3 carbon atoms, and particularly preferably methyl groups.)

Examples of the epoxy group-containing group in the above-mentioned formulas (1), (2) and (3) include a glycidoxymethyl group, a glycidoxyethyl group, a glycidoxypropyl group and the like, and glycidoxypropyl is preferable. It is a group.

(B) Specific examples of the compound that can be used as a tetrafunctional or higher functional cyclic siloxane compound are as follows.

(B) The tetrafunctional or higher functional cyclic siloxane compound may be used alone or in combination of two or more. (B) The content of the tetrafunctional or higher functional cyclic siloxane compound is 0.1 to 10 parts by mass, preferably 1 to 8 parts by mass, more preferably 1 to 8 parts by mass, based on the total mass of the curable composition for inkjet printing of the present invention. Is 2 to 6 parts by mass, most preferably 3 to 5 parts by mass.

<(C) Siloxane compound having one epoxy group (monofunctional siloxane compound)>
In the present invention, (C) any siloxane compound having one epoxy group (also referred to as "monofunctional siloxane compound") may be any compound as long as it has one epoxy group and at least one siloxane bond. Specific examples thereof include a silane coupling agent having one epoxy group as an organic reactive group and an alkyloxy (ethyloxy group, methyloxy group, etc.) as a hydrolyzable group. In this case, the number of alkyloxy groups may be one or two or more.

（式中、Ｒ^１、Ｒ^２、Ｒ^３のうち１つ、２つまたは３つ全てが炭素原子数１〜５のアルコキシ基、好ましくはメトキシ基またはエトキシ基であり、Ｒ^４はエポキシ基含有基である。）。エポキシ基含有基としては、グリシドキシメチル基、グリシドキシエチル基、グリシドキシプロピル基などが挙げられ、好ましくはグリシドキシプロピル基である。 (C) Specific examples of the siloxane compound having one epoxy group include the compound of the following general formula (4).

(In the formula, one, two or all of R ¹ , R ² , and R ³ are alkoxy groups having 1 to 5 carbon atoms, preferably methoxy groups or ethoxy groups, and R ⁴ contains an epoxy group. It is a group.). Examples of the epoxy group-containing group include a glycidoxymethyl group, a glycidoxyethyl group, a glycidoxypropyl group and the like, and a glycidoxypropyl group is preferable.

Specific examples of the compound that can be used as the (C) monofunctional siloxane compound include 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 3-glycidoxypropylmethyldi. Examples thereof include ethoxysilane and 3-glycidoxypropyltriethoxysilane. These may be used individually by 1 type or in combination of 2 or more type.

The content of the monofunctional siloxane compound (C) is 0.1 to 10 parts by mass, preferably 1 to 8 parts by mass, and more preferably 2 to 2 parts by mass based on the total mass of the curable composition for inkjet printing of the present invention. It is 6 parts by mass, most preferably 3 to 5 parts by mass.

<(D) Photopolymerizable monomer>
The curable composition for inkjet printing of the present invention further contains a photopolymerizable monomer. Examples of the photopolymerizable monomer include monofunctional and bifunctional (meth) acrylate compounds and (meth) acrylate compounds containing functional groups such as hydroxyl groups.

Examples of the monofunctional (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and hydroxypropyl (meth) acrylate. Aliphatic (meth) acrylates such as butoxymethyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, isodecyl (meth) acrylate, and glycerol mono (meth) acrylate, cyclohexyl (meth) acrylate, 4- Alicyclic (meth) acrylates such as (meth) acryloxitricyclo [5.2.1.02,6] decane and isobornyl (meth) acrylate, phenoxyethyl (meth) acrylate, benzyl (meth) acrylate, phenyl (meth) Aromatic (meth) acrylates such as meta) acrylates and 2-hydrokey-3-phenoxypropyl (meth) acrylates, modified (meth) acrylates such as aliphatic epoxy-modified (meth) acrylates, tetrahydrofurfuryl (meth) acrylates, 2- Examples thereof include (meth) acryloxyalkyl phosphate, 2- (meth) acryloyloxyethyl phosphate, (meth) acryloyloxyethyl phthalic acid, and γ- (meth) acryloyloxyalkyl trialkoxysilane.

Specific examples of the bifunctional (meth) acrylate include diols such as 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,9-nonanediol diacrylate, and 1,10-decanediol diacrylate. Diacrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, polyethylene glycol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, polypropylene glycol diacrylate, neopentyl glycol Diacrylate, diacrylate of diol obtained by adding at least one of ethylene oxide and propylene oxide to neopentyl glycol, diacrylate of glycol such as caprolactone-modified hydroxypivalate neopentyl glycol diacrylate, bisphenol AEO-modified diacrylate. Examples thereof include acrylate, bisphenol A PO adduct diacrylate, tricyclodecanedimethanol diacrylate, hydrogenated dicyclopentadienyl diacrylate, diacrylate having a cyclic structure such as cyclohexyl diacrylate, and the like.

Commercially available products include light acrylates 1,6HX-A, 1,9ND-A, 3EG-A, 4EG-A, (trade name manufactured by Kyoeisha Chemical Co., Ltd.), HDDA, 1,9-NDA, DPGDA, etc. TPGDA (trade name manufactured by Daicel Cytec), Viscort # 195, # 230, # 230D, # 260, # 310HP, # 335HP, # 700HV, (trade name manufactured by Osaka Organic Chemical Industry Co., Ltd.), Aronix M-208 , M-211B, M-220, M-225, M-240, M-270 (trade name manufactured by Toagosei Co., Ltd.) and the like.

Examples of hydroxyl group-containing (meth) acrylates include 2-hydroxy-3-acryloyloxypropyl (meth) acrylate, 2-hydroxy-3-phenoxyethyl (meth) acrylate, and 1,4-cyclohexanedimethanol mono (meth) acrylate. , 2-Hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol monohydroxypenta (meth) acrylate, 2-hydroxy Examples thereof include propyl (meth) acrylate.

Commercially available products include Aronix M-5700 (trade name manufactured by Toa Synthetic Co., Ltd.), 4HBA, 2HEA, CHDMMA (above, trade name manufactured by Nihon Kasei Co., Ltd.), BHEA, HPA, HEMA, HPMA (above, manufactured by Nihon Kasei Co., Ltd.). Product name), light ester HO, light ester HOP, light ester HOA (above, product name manufactured by Kyoeisha Chemical Co., Ltd.) and the like. The (meth) acrylate compound having a hydroxyl group can be used alone or in combination of two or more.

Further, in the present invention, a bifunctional or higher (meth) acrylate monomer having a heterocycle can be used.

As a bifunctional or higher (meth) acrylate monomer having a heterocycle, a cyclic group of either an alicyclic group or an aromatic group having one or two heteroatoms and two carbon atoms of these cyclic groups are used. In contrast to the above, it is preferable that each (meth) acryloyl group has a structure in which it is directly bonded or bonded via an alkylene group (for example, a methylene group or an ethylene group). The carbon to which the (meth) acryloyl group of the cyclic group is not bonded or the carbon to which the (meth) acryloyl group is bonded may be further substituted with a linear or branched lower alkyl group.

The one or two heteroatoms contained in the heterocycle are any one of oxygen, nitrogen, sulfur or any combination thereof, preferably one or two oxygens, particularly two. It is oxygen.

Examples of cyclic groups having a heteroatom include alicyclic groups such as azolidine, oxolane, thiolane, piperidine, tetrahydropyran, tetrahydrothiopyrane, hexamethyleneimine, hexamethylene oxide, hexamethylenesulfide, dioxane, dioxolane, and azole. , Oxol, thiol, pyridine, pyridinium, azepine, oxepine, thiepin, imidazole, pyrazole, oxazole, thiazole, imidazoline, morpholine, pyridazine, pyrimidine, pyrazine and other aromatic divalent groups.

Of these, the heterocycle constituting a part of the bifunctional or higher (meth) acrylate monomer having a heterocycle of the present invention is a 5- or 6-membered alicyclic heterocycle such as tetrahydrofuran, tetrahydropyran, dioxane, or dioxolane. It is preferably a group.

As an example of a commercially available product of a bifunctional or higher (meth) acrylate monomer having a heterocycle, KAYARAD R604 (manufactured by Nippon Kayaku Co., Ltd.) can be mentioned.

In addition, in the present invention, a (meth) acrylate monomer having a functional group having an active hydrogen atom, for example, an OH group, an NH group, an NH2 group, an SH group, and a COOH group can be used in combination. The component contributes to the improvement of the curability of the coating film of the curable composition of the present invention by reacting with the (A) thermosetting compound.

For example, monofunctional alcohols such as pentaerythritol triacrylate and hydroxylbutyl acrylate, and polyfunctional alcohols such as trimethylolpropane and hydrogenated bisphenol A, or ethylene oxide adducts and propylene oxide adducts of polyhydric phenols such as bisphenol A and biphenol. At least one of the above acrylates, polyfunctional or monofunctional polyurethane acrylate which is an isocyanate variant of hydroxyl group-containing acrylate, bisphenol A diglycidyl ether, hydrogenated bisphenol A diglycidyl ether or (meth) acrylic of phenol novolac epoxy resin. Epoxy acrylates which are acid adducts, corresponding methacrylate compounds and the like can be used. Acrylic acid can also be used.

In the present invention, it is preferable to use a monofunctional and / or bifunctional (meth) acrylate monomer as the photopolymerizable monomer, whereby the photocurable thermosetting composition of the present invention is applied to a substrate such as a substrate. A pattern can be printed on a product with an optimum viscosity by an inkjet method, and the adhesion, HAST resistance, heat resistance, hardness, and chemical resistance of the cured product obtained by curing the product become extremely good.

The content of the photopolymerizable monomer is preferably 20 to 90% by mass, more preferably 30 to 80% by mass, based on the mass of the curable composition for inkjet printing of the present invention.

<(E) Photopolymerization Initiator>
The photopolymerization initiator is not particularly limited as long as it can polymerize the (meth) acrylate by irradiation with energy rays, and a radical polymerization initiator can be used. In the present specification and claims, "(meth) acrylate" is a general term for acrylate, methacrylate and a mixture thereof, and the same applies to other similar expressions.

As the photoradical polymerization initiator, any compound that generates radicals by light, laser, electron beam or the like and initiates a radical polymerization reaction can be used. Examples of the photoradical polymerization initiator include benzoin and benzoin alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether, and benzoin isopropyl ether; acetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-. Acetphenones such as diethoxy-2-phenylacetophenone and 1,1-dichloroacetophenone; 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one, 2-benzyl-2-dimethylamino Aminoacetophenones such as -1- (4-morpholinophenyl) -butane-1-one, N, N-dimethylaminoacetophenone; 2-methylanthraquinone, 2-ethylanthraquinone, 2-t-butylanthraquinone, 1-chloroanthraquinone Anthraquinones such as 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, 2-chlorothioxanthone, 2,4-diisopropylthioxanthone and the like; acetals such as acetphenone dimethyl ketal and benzyl dimethyl ketal; 2,4 , 5-Triarylimidazole dimer; riboflavin tetrabutyrate; thiol compounds such as 2-mercaptobenzoimidazole, 2-mercaptobenzoxazole, 2-mercaptobenzothiazole; 2,4,6-tris-s-triazine, 2, , 2,2-Tribromoethanol, organic halogen compounds such as tribromomethylphenylsulfone; benzophenones, benzophenones or xanthons such as 4,4'-bisdiethylaminobenzophenone; 2,4,6-trimethylbenzoyldiphenylphosphine oxide, Examples thereof include acylphosphine oxides such as bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide.

The photoradical polymerization initiator can be used alone or in combination of two or more. Furthermore, in addition to these, tertiary amines such as N, N-dimethylaminobenzoic acid ethyl ester, N, N-dimethylaminobenzoic acid isoamyl ester, pentyl-4-dimethylaminobenzoate, triethylamine, triethanolamine, etc. Photoinitiator aids can be used. Further, a titanocene compound of Omnirad 784 or the like (manufactured by IGM Resins) having absorption in the visible light region can also be added to the photoradical polymerization initiator in order to promote the photoreaction. The components to be added to the photoradical polymerization initiator are not limited to these, as long as they absorb light in the ultraviolet light or visible light region and radically polymerize unsaturated groups such as (meth) acryloyl groups. , Not limited to photopolymerization initiators and photoinitiator aids, can be used alone or in combination of two or more.

Product names of commercially available photopolymerization initiators include, for example, Omnirad 907, Omnirad 127, Omnirad 379, Omnirad 81, Omnirad 81, and Omnirad 819. ) BDK, Omnirad TPO (both manufactured by IGM Resins) and the like.

The blending amount of the photopolymerization initiator is, for example, 0.1 to 50% by mass, particularly 0.1 to 20% by mass, preferably 0.5 to 15% by mass, based on the mass of the curable composition for inkjet printing of the present invention. It is by mass, more preferably 0.5 to 10% by mass, and even more preferably 1 to 10% by mass.

<Other ingredients>
The curable composition for inkjet printing of the present invention includes a defoaming / leveling agent, a thixotropy-imparting agent / thickener, a coupling agent, a dispersant, a flame retardant, a fluorescent whitening agent, a coloring agent, and silicon, if necessary. Additives such as system additives can be contained.

Antifoaming agents and leveling agents include compounds such as silicones, modified silicones, mineral oils, vegetable oils, fatty alcohols, fatty acids, metal soaps, fatty acid amides, polyoxyalkylene glycols, polyoxyalkylene alkyl ethers, and polyoxyalkylene fatty acid esters. Can be used.

Examples of thixotropic agents and thickeners include viscous minerals such as kaolinite, smectite, montmorillonite, bentonite, talc, mica, and zeolite, fine particle silica, silica gel, amorphous inorganic particles, polyamide-based additives, and modified urea-based additives. Wax-based additives can be used.

By adding a defoaming / leveling agent, a thixotropy imparting agent / thickener, the surface characteristics of the cured product and the properties of the composition can be adjusted.

Coupling agents include methoxy group, ethoxy group, acetyl and the like as alkoxy groups, and vinyl, methacryl, acrylic, epoxy, cyclic epoxy, mercapto, amino, diamino, acid anhydride, ureido, sulfide, etc. as reactive functional groups. Vinyl silane compounds such as isocyanates such as vinyl ethoxylan, vinyl trimethoxysilane, vinyl tris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxylan, γ-aminopropyltrimethoxylan, Ν -Β- (Aminoethyl) γ-aminopropyltrimethoxysilane, N-β- (Aminoethyl) γ-aminopropylmethyldimethoxysilane, γ-ureidopropyltriethoxysilane and other amino-based silane compounds, γ-glycid Epoxysilane compounds such as xypropyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxylane, γ-glycidoxypropylmethyldiethoxysilane, mercaptosilanes such as γ-mercaptopropyltrimethoxysilane Compounds, silane coupling agents such as phenylamino-based silane compounds such as Ν-phenyl-γ-aminopropyltrimethoxysilane, isopropyltriisostearoylated titanate, tetraoctylbis (ditridecylphosphate) titanate, bis (dioctylpyrophosphate) ) Oxyacetate titanate, isopropyltridodecylbenzenesulfonyl titanate, isopropyltris (dioctylpyrophosphate) titanate, tetraisopropylbis (dioctylphosphite) titanate, tetra (1,1-diallyloxymethyl-1-butyl) bis- (ditridecyl) Phosphite titanate, bis (dioctylpyrophosphate) ethylene titanate, isopropyltrioctanoyl titanate, isopropyldimethacrylisostearoyl titanate, isopropyltristearoyldiacrylic titanate, isopropyltri (dioctylphosphate) titanate, isopropyltricylphenyl titanate, dicumylphenyl Titanate-based coupling agents such as oxyacetate titanate and diisostearoylethylene titanate, ethylenically unsaturated zirconeate-containing compounds, neoalkoxyzirconate-containing compounds, neoalkoxytris neodecanoyl zirconeate, neoalkoxytris (dodecyl) Nzensulfonyl zirconate, neoalkoxytris (dioctyl) phosphate zirconate, neoalkoxytris (dioctyl) pyrophosphate zirconate, neoalkoxytris (ethylenediamino) ethylzirconate, neoalkoxytris (m-amino) phenylzirconate, tetra (2,2-diallyloxymethyl) butyl, di (ditridecyl) phosphytozirconate, neopentyl (diallyl) oxy, trineodecanoylzirconate, neopentyl (diallyl) oxy, tri (dodecyl) benzene-sulfonylzirconate, neopentyl (Diallyl) Oxy, Tri (Dioctyl) Phosphatezirconate, Neopentyl (Diallyl) Oxy, Tri (Dioctyl) Pyro-phosphatzirconate, Neopentyl (Diallyl) Oxy, Tri (N-ethylenediamino) Ethylzirconate, Neopentyl ( Diallyl) oxy, tri (m-amino) phenylzirconate, neopentyl (diallyl) oxy, trimethacrylzirconate (, neopentyl (diallyl) oxy, triacrylic zirconate, dineopentyl (diallyl) oxy, diparaaminobenzoylzirconate, dineopentyl (Diallyl) oxy, di (3-mercapto) propionic zirconate, zirconium (IV) 2,2-bis (2-propenolatomethyl) butanorat, cyclodi [2,2- (bis2-propenolatomethyl) ) Butanorat] Pyrophosphato-zirconate-based coupling agents such as O and O, and aluminate-based coupling agents such as diisobutyl (oleyl) acetoacetylalkylate and alkylacetacetate aluminum diisopropylate can be used.

Examples of the dispersant include high molecular weight dispersants such as polycarboxylic acid type, naphthalene sulfonic acid formalin condensation type, polyethylene glycol, polycarboxylic acid partial alkyl ester type, polyether type, and polyalkylene polyamine type, alkyl sulfonic acid type, and four. Low molecular weight dispersants such as lower ammonium type, higher alcohol alkylene oxide type, polyhydric alcohol ester type, and alkyl polyamine type can be used.

Flame retardants include hydrated metals such as aluminum hydroxide and magnesium hydroxide, red phosphorus, ammonium phosphate, ammonium carbonate, zinc borate, zinc nitrate, molybdenum compound, bromine compound, chlorine compound, and phosphoric acid ester. , Phosphoric acid-containing polyol, phosphorus-containing amine, melamine cyanurate, melamine compound, triazine compound, guanidine compound, silicon polymer and the like can be used.

As the fluorescent whitening agent, a benzoxazoyl derivative, a coumarin derivative, a styrene biphenyl derivative, a pyrazolone derivative, a bis (triazinylamino) stilbene disulfonic acid derivative and the like can be used.

In order to adjust the polymerization rate and the degree of polymerization, it is also possible to further add a polymerization inhibitor and a polymerization retarder.

Further, although a solvent may be used for adjusting the viscosity of the curable composition for inkjet printing of the present invention, it is preferable that the amount added is small in order to prevent a decrease in drawing accuracy due to volatilization of the solvent. Further, it is more preferable that the solvent for adjusting the viscosity is not contained.

A colorant such as a coloring pigment or a dye may be added to the curable composition of the present invention for the purpose of coloring. As the coloring pigment, the dye, and the like, known and commonly used dyes represented by color indexes can be used. For example, Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 60, Solvent Blue 35, 63, 68, 70, 83, 87, 94, 97, 122, 136, 67, 70, Pigment Green 7, 36, 3, 5, 20, 28, Solvent Yellow 163, Pigment Yellow 24, 108, 193, 147, 199, 202, 110, 109, 139 179 185 93, 94, 95, 128, 155, 166, 180, 120, 151, 154, 156, 175, 181, 1, 2, 3, 4, 5, 6, 9, 10, 12, 61, 62, 62: 1, 65, 73, 74, 75, 97, 100, 104, 105, 111, 116, 167, 168, 169, 182, 183, 12, 13, 14, 16, 17, 55, 63, 81, 83, 87, 126, 127, 152, 170, 172, 174, 176, 188, 198, Pigment Orange 1, 5, 13, 14, 16, 17, 24, 34, 36, 38, 40, 43, 46, 49, 51, 61, 63, 64, 71, 73, Pigment Red 1, 2, 3, 4, 5, 6, 8, 9, 12, 14, 15, 16, 17, 21, 22, 23, 31, 32, 112, 114, 146, 147, 151, 170, 184, 187, 188, 193, 210, 245, 253, 258, 266, 267, 268, 269, 37, 38, 41, 48: 1, 48: 2, 48: 3, 48: 4, 49: 1, 49: 2, 50: 1, 52: 1, 52: 2, 53: 1, 53: 2, 57: 1, 58: 4, 63: 1, 63: 2, 64: 1, 68, 171, 175, 176, 185, 208, 123, 149, 166, 178, 179, 190, 194, 224, 254, 255, 264, 270, 272, 220, 144, 166, 214, 220, 221. 242, 168, 177, 216, 122, 202, 206, 207, 209, Solvent Red 135, 179, 149, 150, 52, 207, Pigment Violet 19, 23, 29, 32, 36, 38, 42, Solvent Violet 13, 36, Pigment Brown 23, 25, Pigment Black 1, 7, and the like can be mentioned. It is preferable to add 0.01 to 5% by mass of these coloring pigments, dyes and the like based on the mass of the curable composition for inkjet printing of the present invention.

When the curable composition of the present invention is used as a white curable composition, it is preferable to add rutile-type or anatase-type titanium oxide. In this case, it is preferable to add 1 to 50% by mass based on the mass of the curable composition for inkjet printing of the present invention. These coloring pigments, dyes, etc. can be used alone or in combination of two or more.

The curable composition of the present invention can be applied to printing by an inkjet method. To be applicable to printing by the inkjet method, it is preferable that the viscosity is such that it can be ejected by an inkjet printer.

Viscosity refers to the viscosity measured according to JIS Z8803. Further, the viscosity of the curable composition for inkjet printing is preferably less than 20 mPa · s at 50 ° C., particularly preferably 5 mPa · s or more and 15 mPa · s or less. Within this range, the inkjet printer can eject without any problem. It is also preferable that the curable composition for inkjet printing of the present invention has a viscosity of 150 mPa · s or less at room temperature (25 ° C.).

Therefore, the inkjet curable composition of the present invention can draw a pattern directly on a substrate, specifically, a substrate for a printed wiring board, a glass substrate, a silicon wafer, or the like.

The curable composition of the present invention is used as an ink in an inkjet printer and is used for printing on a substrate.

Since the curable composition of the present invention contains a photopolymerization initiator, the composition layer can be photocured by irradiating the composition layer immediately after printing with light. The light irradiation is performed by irradiation with active energy rays such as ultraviolet rays, electron beams, and chemical rays, preferably by ultraviolet irradiation.

For example, for a composition containing an ultraviolet-sensitive photopolymerization initiator, the composition layer can be photocured by irradiating with ultraviolet rays.

Ultraviolet irradiation in an inkjet printer can be performed, for example, by attaching a light source such as a high-pressure mercury lamp, a metal halide lamp, or an ultraviolet LED to the side surface of the print head, and scanning by moving the print head or the base material. In this case, printing and ultraviolet irradiation can be performed almost at the same time.

Further, since the curable composition of the present invention contains a thermosetting compound, it is thermoset by using a known heating means, for example, a heating furnace such as a hot air furnace, an electric furnace, or an infrared induction heating furnace.

In order for the cured product obtained by the curable composition of the present invention to satisfy the requirements of general properties, it is preferable to cure the cured product by heating at 120 ° C. to 200 ° C. for 5 to 60 minutes.

Further, when the substrate is a so-called rigid substrate, that is, a double-sided plate having wiring printed on both sides or a multilayer plate obtained by laminating the substrates, the substrate having a coating film made of the curable composition is described multiple times. It is subjected to the soldering process and is repeatedly heated.

The cured product of the curable composition of the present invention is excellent in heat resistance, adhesion to a substrate, and hardness, and therefore can be applied to various uses, and the application target is not particularly limited. For example, it is preferably used for an insulating film for a printed wiring board (rigid substrate, flexible substrate), marking, and the like.

As described above, the present invention also provides a cured product obtained by curing the curable composition for inkjet printing of the present invention, and an electronic component having the cured product. By using the curable composition for inkjet printing of the present invention, electronic components having high quality, durability and reliability are provided. In the present invention, the electronic component means a component used in an electronic circuit, and includes active components such as printed wiring boards, transistors, light emitting diodes, and laser diodes, as well as passive components such as resistors, capacitors, inductors, and connectors. The cured product of the curable composition of the present invention exhibits the effect of the present invention as these insulating cured coating films.

Hereinafter, the present invention will be described with reference to Examples.

[Examples 1 to 3 and Comparative Examples 1 to 4]
<Preparation of composition>
Each component was blended at the ratio (unit: parts by mass) shown in Table 1, and this was stirred with a dissolver. As a result, the compositions of the present invention (Examples 1 to 3) and comparative compositions (Comparative Examples 1 to 4) were obtained.

<Evaluation>
(1) Viscosity The viscosity of the obtained composition was measured according to the measurement method of JIS Z8803. The measurement temperature is 50 ° C. 15 mPa · s or less was marked with ⊚, more than 15 mPa · s was marked with ◯, and 20 mPa · s or more was marked with x.

(2) Adhesion The above composition was applied onto a JEITA specification silicon wafer using a piezo type inkjet printing machine. At this time, immediately after printing, temporary curing was performed by irradiating the inkjet head with ultraviolet rays of 1000 mJ / cm ² at 365 nm. The coated film after irradiation was heated at 200 ° C. for 60 minutes on a hot stage in a nitrogen atmosphere to prepare a cured coating film having a film thickness of 30 μm. This cured coating film was evaluated according to the following criteria by visually observing the state of the coating film after performing a peeling test with a cellophane adhesive tape in accordance with the method of JIS C5012. Those with no change in the coating film were marked with ◯, and those with the peeled coating film were marked with x.

(3) A cured coating film was formed on a JEIDA-specification silicon wafer on which a HAST-resistant comb-shaped electrode (line / space = 20 microns / 20 microns) was formed by the above method to prepare an evaluation substrate. This evaluation substrate was placed in a high-temperature and high-humidity tank in an atmosphere of 130 ° C. and 85% humidity, charged with a voltage of 25 V, and subjected to an in-tank HAST test for 168 hours. The insulation resistance value in the tank after 168 hours was evaluated according to the following criteria. 1E8Ω or more was designated as ◯, 1E6 to 1E8Ω was designated as Δ, and 1E6Ω or less was designated as x.

The results are shown in the table below.

Details of the materials used are as follows.
7892: Blocked isocyanate (manufactured by Baxenden Chemicals)
KBM-403: 3-glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd.)
4-HBA: 4-Hydroxybutyl acrylate (manufactured by Nihon Kasei Corporation)
HDDA: 1,6-Hexanediol diacrylate (manufactured by Daicel Ornex)
DPGDA: Dipropylene glycol diacrylate (manufactured by Daicel Ornex)
M-221B: Bisphenol A EO modified diacrylate (manufactured by Toagosei)
POA: Phenoxyethyl acrylate (Kyoeisha Kagaku)
Omnirad379: 2-Benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone (manufactured by IGM Resins)
MA-100: Carbon black (manufactured by Mitsubishi Chemical Corporation)
BYK-307: Silicone additive (manufactured by Big Chemie Japan)
Compounds A to E are as follows.

<Evaluation result>
In Examples 1 to 3 in which a tetrafunctional or higher functional cyclic siloxane and a monofunctional siloxane compound were used in combination, good results were obtained in all of the viscosity, adhesion and HAST resistance. On the other hand, in Comparative Example 1 containing no monofunctional siloxane compound, it was found that the evaluation of viscosity and HAST resistance was inferior. In Comparative Examples 2 to 4 containing no tetrafunctional or higher functional cyclic siloxane compound, it was found that the evaluation of both adhesion and HAST resistance was inferior.

The present invention is not limited to the configuration and examples of the above-described embodiment, and various modifications can be made within the scope of the gist of the invention.

Claims (4)

(A) Thermosetting compound,
(B) Cyclic siloxane compound having 4 or more epoxy groups,
(C) A siloxane compound having one epoxy group,
(D) Photopolymerizable monomer, and (E) Photopolymerization initiator,
Curable composition for inkjet printing, including. The curable composition for inkjet printing according to claim 1, wherein the viscosity at 50 ° C. measured according to JIS Z8803 is 5 mPa · s or more and 15 mPa · s or less. A cured product of the curable composition for inkjet printing according to claim 1 or 2. An electronic component having the cured product according to claim 3.