Coated molded product, molding material, and thermosetting resin composition

Abstract

To provide a coated molded article which is excellent in adhesion between a molded article and a top coat coating the surface of the molded article, a molding material for forming the molded article, and a thermosetting resin composition contained in the molding material.SOLUTION: A coated molded article includes a molded article, and a top coat containing a urethane-based coating material coating the surface of the molded article. The molded article includes a cured product of the molding material. The molding material contains a thermosetting resin composition, and reinforcement fibers. The thermosetting resin composition is a thermosetting resin containing at least one selected from the group consisting of unsaturated polyester and vinyl ester, and a polymerizable monomer. A hydroxyl group-containing polymerizable monomer is contained in a part of the polymerizable monomer.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a coated molded article, a molding material, and a thermosetting resin composition, and more particularly to a coated molded article, a molding material for forming the coated molded article, and a thermosetting resin composition contained in the molding material. [Background technology]

[0002] 2. Description of the Related Art Conventionally, molded articles such as artificial marble have been widely used for home equipment applications such as bathtubs, kitchen counter tops, kitchen counter sinks, and washstand counters.

[0003] Such molded articles are usually formed from a cured product of a molding material that contains a resin composition and reinforcing fibers such as glass fibers.

[0004] It is known that the surfaces of such molded articles are painted with urethane paint from the viewpoints of stain resistance, water repellency, and the like.

[0005] Specifically, a method for manufacturing a fiber-reinforced thermosetting resin molded product has been proposed in which a molded product is formed from fiber-reinforced thermosetting resin, the surface of the molded product is then embossed to form irregularities on the surface of the molded product, and then the irregularities of the molded product are coated with urethane paint (see, for example, Patent Document 1 below).

[0006] In this method, the unevenness formed on the surface of the molded article ensures adhesion between the molded article and the urethane coating. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 9-290462 Summary of the Invention [Problem to be solved by the invention]

[0008] In Patent Document 1, the surface of the molded product is embossed, which makes the work complicated.

[0009] The present invention provides a coated molded article having excellent adhesion between the molded article and a top coat that covers the surface of the molded article, a molding material for forming the coated molded article, and a thermosetting resin composition contained in the molding material. [Means for solving the problem]

[0010] The present invention [1] is a coated molded article comprising a molded article and a top coat containing a urethane-based paint that covers the surface of the molded article, the molded article containing a cured product of a molding material, the molding material containing a thermosetting resin composition and reinforcing fibers, the thermosetting resin composition containing a thermosetting resin containing at least one selected from the group consisting of unsaturated polyesters and vinyl esters and a polymerizable monomer, and a hydroxyl group-containing polymerizable monomer is contained in a portion of the polymerizable monomer.

[0011] The present invention [2] is a molding material for molding the coated molded product of the above [1], comprising the thermosetting resin composition and the reinforcing fiber, wherein the thermosetting resin composition comprises a thermosetting resin comprising at least one selected from the group consisting of unsaturated polyesters and vinyl esters, and the polymerizable monomer, and a hydroxyl group-containing polymerizable monomer is included as part of the polymerizable monomer.

[0012] The present invention [3] is a thermosetting resin composition contained in the molding material described in [2] above, which includes a thermosetting resin containing at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer, and the thermosetting resin composition includes a hydroxyl group-containing polymerizable monomer as part of the polymerizable monomer.

[0013] The present invention [4] includes the thermosetting resin composition according to the above [3], wherein the polymerizable monomer includes another polymerizable monomer, the hydroxyl group-containing polymerizable monomer is 2-hydroxyethyl (meth)acrylate or hydroxypropyl (meth)acrylate, and the other polymerizable monomer is styrene.

[0014] The present invention [5] includes the thermosetting resin composition according to the above [3] or [4], in which the blending ratio of the polymerizable monomer in the thermosetting resin is 44 mass% or more and 54 mass% or less.

[0015] The present invention [6] includes the thermosetting resin composition according to any one of the above [3] to [5], which further includes a silane coupling agent. Effect of the Invention

[0016] In the coated molded article of the present invention, a hydroxyl group-containing polymerizable monomer is contained as a part of the polymerizable monomer, and therefore, in this coated molded article, the molded article has excellent adhesion to the top coat that covers the surface of the molded article.

[0017] In the molding material of the present invention, a hydroxyl group-containing polymerizable monomer is contained as a part of the polymerizable monomer, and therefore, this molding material can provide a coated molded article having excellent adhesion between the molded article and a top coat that covers the surface of the molded article.

[0018] In the thermosetting resin composition of the present invention, a hydroxyl group-containing polymerizable monomer is contained as a part of the polymerizable monomer, and therefore, according to this thermosetting resin composition, a coated molded article having excellent adhesion between the molded article and a top coat that covers the surface of the molded article can be obtained. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The coated molded article of the present invention comprises a molded article and a top coat that covers the surface of the molded article.

[0020] The molded article includes a cured product of the molding material.

[0021] The molding material includes a thermosetting resin composition and reinforcing fibers.

[0022] The thermosetting resin composition contains a thermosetting resin that contains at least one selected from the group consisting of unsaturated polyesters and vinyl esters, and a polymerizable monomer.

[0023] Unsaturated polyesters are the polymerization products of polybasic acids and polyhydric alcohols.

[0024] The polybasic acid includes a polybasic acid having an ethylenically unsaturated double bond as an essential component (hereinafter referred to as an unsaturated polybasic acid) and a polybasic acid not having an ethylenically unsaturated double bond as an optional component (hereinafter referred to as a saturated polybasic acid).

[0025] Examples of the unsaturated polybasic acids include maleic acid, fumaric acid, itaconic acid, and dihydromuconic acid.

[0026] The unsaturated polybasic acids also include acid anhydrides derived from the above ethylenically unsaturated aliphatic dibasic acids, such as maleic anhydride.

[0027] Preferable examples of the unsaturated polybasic acid include maleic anhydride and fumaric acid.

[0028] Examples of the saturated polybasic acid include saturated aliphatic polybasic acids, saturated alicyclic polybasic acids, aromatic polybasic acids, anhydrides and halides of these acids.

[0029] Examples of saturated aliphatic polybasic acids include oxalic acid, malonic acid, succinic acid, methylsuccinic acid, 2,2-dimethylsuccinic acid, 2,3-dimethylsuccinic acid, hexylsuccinic acid, glutaric acid, 2-methylglutaric acid, 3-methylglutaric acid, 2,2-dimethylglutaric acid, 3,3-dimethylsuccinic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and dimer acid.

[0030] The saturated aliphatic polybasic acids also include acid anhydrides derived from the above-mentioned saturated aliphatic dibasic acids, such as oxalic anhydride and succinic anhydride.

[0031] Examples of saturated alicyclic polybasic acids include saturated alicyclic dibasic acids such as HET acid, 1,2-hexahydrophthalic acid, 1,1-cyclobutanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid (cis- or trans-1,4-cyclohexanedicarboxylic acid or a mixture thereof).

[0032] The saturated alicyclic polybasic acids include acid anhydrides derived from the above-mentioned saturated alicyclic dibasic acids, such as HET anhydride, tetrahydrophthalic anhydride, and hexahydrophthalic anhydride.

[0033] Examples of aromatic polybasic acids include phthalic acid (orthophthalic acid, isophthalic acid, terephthalic acid), trimellitic acid, and pyromellitic acid.

[0034] The aromatic polybasic acids also include acid anhydrides derived from the above aromatic dibasic acids, such as phthalic anhydride, trimellitic anhydride, and pyromellitic anhydride.

[0035] The polybasic acids can be used alone or in combination of two or more kinds.

[0036] When an unsaturated polybasic acid and a saturated polybasic acid are used in combination, the mixing ratio of the unsaturated polybasic acid to the polybasic acids (their total amount) is, for example, 50 mol % or more and, for example, 90 mol % or less.

[0037] Examples of polyhydric alcohols include alkane diols such as ethylene glycol, propylene glycol (1,2- or 1,3-propanediol or a mixture thereof), butylene glycol (1,2-, 1,3-, or 1,4-butylene glycol or a mixture thereof), 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 2-methyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, 3-methyl-1,5-pentanediol, 2,2,2-trimethylpentanediol, and 3,3-dimethylolheptane; aliphatic diols such as ether diols such as diethylene glycol, triethylene glycol, and dipropylene glycol; cyclohexanediol (1,2-, 1,3-, or 1,4-cyclohexanediol or a mixture thereof), cyclohexanedimethanol; Examples of the alcohol include alicyclic diols such as cyclohexanediethanol and hydrogenated bisphenol A; aromatic diols such as bisphenol A, ethylene oxide adducts of bisphenol A, and propylene oxide adducts of bisphenol A; trihydric alcohols such as glycerin, trimethylolpropane, and triisopropanolamine; tetrahydric alcohols such as tetramethylolmethane (pentaerythritol) and diglycerin; pentahydric alcohols such as xylitol; and hexahydric alcohols such as sorbitol, mannitol, allitol, iditol, dulcitol, altritol, inositol, and dipentaerythritol. Dihydric alcohols are preferred, aliphatic diols are more preferred, and alkanediols are particularly preferred. Propylene glycol and neopentyl glycol are particularly preferred.

[0038] The polyhydric alcohols can be used alone or in combination of two or more kinds.

[0039] The unsaturated polyester can be obtained by polycondensation (condensation polymerization) of a polybasic acid and a polyhydric alcohol.

[0040] To polycondense (condensation polymerize) a polybasic acid and a polyhydric alcohol, they are mixed so that the equivalent ratio of the polyhydric alcohol to the polybasic acid (hydroxyl groups of the polyhydric alcohol / carboxyl groups of the polybasic acid) is, for example, 0.9 or more, preferably 0.95 or more, and for example, 1.2 or less, preferably 1.1 or less, and reacted under normal pressure in a nitrogen atmosphere.

[0041] The reaction temperature is, for example, 150° C. or more, preferably 190° C. or more, and for example, 250° C. or less, preferably 230° C. or less.

[0042] In the above reaction, a known solvent and a known catalyst can be added, if necessary.

[0043] This gives an unsaturated polyester.

[0044] The acid value of the unsaturated polyester (measurement method: in accordance with JIS K6901 (2008)) is, for example, 10 mgKOH / g or more, preferably 20 mgKOH / g or more, and for example, less than 50 mgKOH / g, preferably 40 mgKOH / g or less.

[0045] The unsaturated polyesters can be used alone or in combination of two or more kinds.

[0046] Vinyl esters are the reaction products of epoxy resins and unsaturated monobasic acids.

[0047] Examples of the epoxy resin include bisphenol type epoxy resins and novolac type epoxy resins, and preferably bisphenol type epoxy resins.

[0048] The bisphenol type epoxy resin is represented by the following general formula (1).

[0049] [ka]

[0050] (In the formula, Y 1 represents any one of -C(CH3)2-, -CH2-, -O-, -S-, and -(O=S=O)-, and n represents an integer of 0 to 5. Examples of such bisphenol type epoxy resins include bisphenol A type epoxy resins, bisphenol F type epoxy resins, and bisphenol S type epoxy resins, and preferably bisphenol A type epoxy resins.

[0051] The epoxy resin can also be modified with a phenolic compound such as bisphenol A, bisphenol F, or bisphenol S.

[0052] In order to modify an epoxy resin with a phenolic compound, the epoxy resin is reacted with the phenolic compound.

[0053] The mixing ratio of the phenol compound is, for example, 0.1 mol or more, preferably 0.2 mol or more, and for example, 0.5 mol or less, relative to 1 mol of the epoxy resin.

[0054] In the above reaction, the reaction temperature is, for example, 100°C or higher, preferably 130°C or higher, and, for example, 180°C or lower.

[0055] In the above reaction, a catalyst can be added, if necessary.

[0056] Examples of the catalyst include amines such as triethylamine and benzyldimethylamine; ammonium salts such as tetramethylammonium chloride and triethylbenzylammonium chloride; imidazoles such as 2-ethyl-4-imidazole; amides, pyridines, phosphines such as triphenylphosphine; phosphonium salts such as tetraphenylphosphonium bromide and ethyltriphenylphosphonium bromide; sulfonium salts, such as sulfonic acids; and organic metal salts such as zinc octylate. Preferred are ammonium salts and phosphonium salts, and more preferred are triethylbenzylammonium chloride and tetraphenylphosphonium bromide.

[0057] The catalysts can be used alone or in combination of two or more kinds.

[0058] The mixing ratio of the catalyst is, for example, 0.1 parts by mass or more and, for example, 3 parts by mass or less, preferably 1 part by mass or less, relative to 100 parts by mass of the epoxy resin.

[0059] This allows the epoxy resin to be modified with the phenol compound.

[0060] The epoxy resins can be used alone or in combination of two or more kinds.

[0061] The epoxy equivalent of the epoxy resin is, for example, 100 g equivalent or more, preferably 150 g equivalent or more, and for example, 550 g equivalent or less, preferably 500 g equivalent or less.

[0062] The unsaturated monobasic acid is, for example, a monocarboxylic acid such as (meth)acrylic acid, crotonic acid, cinnamic acid, sorbic acid, etc. Here, (meth)acrylic is synonymous with methacryl and / or acrylic.

[0063] The unsaturated monobasic acids can be used alone or in combination of two or more kinds.

[0064] As the unsaturated monobasic acid, preferably, a monocarboxylic acid is used, more preferably, (meth)acrylic acid is used, and further preferably, methacrylic acid is used.

[0065] To obtain the vinyl ester, the above-mentioned epoxy resin or the epoxy resin and the phenol compound-modified epoxy resin are reacted with an unsaturated monobasic acid.

[0066] In the above reaction, an addition reaction occurs between the epoxy group of the epoxy resin and the unsaturated monobasic acid.

[0067] The equivalent weight of the carboxyl group of the unsaturated monobasic acid to the epoxy group of the epoxy resin is, for example, 0.8 or more, preferably 0.9 or more, and for example, 1.5 or less, preferably 1.1 or less.

[0068] In the above reaction, the reaction temperature is, for example, 80° C. or more, preferably 100° C. or more, and for example, 150° C. or less, preferably 130° C. or less.

[0069] In the above reaction, a known solvent and a known catalyst (for example, the above-mentioned catalyst (preferably an ammonium salt, more preferably triethylbenzylammonium chloride)) can be added as necessary.

[0070] The above reaction is carried out in the presence of a polymerization inhibitor.

[0071] Examples of the polymerization inhibitor include hydroquinone compounds such as hydroquinone, methylhydroquinone, and t-butylhydroquinone, benzoquinone compounds such as p-benzoquinone and methyl-p-benzoquinone, catechol compounds such as t-butylcatechol, phenol compounds such as 2,6-di-t-butyl-4-methylphenol and 4-methoxyphenol, and 1-oxyl-2,2,6,6-tetramethylpiperidine, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-ol, 4-hydroxy-2,2, 6,6-tetrapiperidine-1-oxyl, 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl-acetate, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl-2-ethylhexanoate, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl-stearate, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl-4-t-butylbenzoate, bis(1-oxyl-2,2,6,6-tetramethylpiperidinyl) Bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) succinate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) adipate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) sebacate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) n-butylmalonate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) phthalate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) isophthalate, bis(1-oxyl-2,2,6 ,6-tetramethylpiperidin-4-yl) terephthalate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) hexahydroterephthalate, N,N'-bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) adipamide, N-bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) caprolactam, N-bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) dodecyl succinimide, 2,4,6-tris-[N-butyl-N-(1-oxyl-2,2,6,Examples of the N-oxyl compounds include N-oxyl compounds such as 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl)-s-triazine and 1-oxyl-2,2,6,6-tetramethylpiperidin-4-one, and preferably, hydroquinone compounds, and more preferably, hydroquinone.

[0072] The polymerization inhibitors can be used alone or in combination of two or more kinds.

[0073] The mixing ratio of the polymerization inhibitor relative to 100 parts by mass of the epoxy resin is, for example, 0.005 parts by mass or more, preferably 0.01 parts by mass or more, and for example, 0.05 parts by mass or less, preferably 0.03 parts by mass or less.

[0074] This gives a vinyl ester.

[0075] Such vinyl esters can also be modified with acid anhydrides.

[0076] That is, vinyl esters include vinyl esters modified with acid anhydrides (hereinafter referred to as acid-modified vinyl esters) and vinyl esters not modified with acid anhydrides (hereinafter referred to as unmodified vinyl esters).

[0077] Acid modified vinyl esters are the reaction products of vinyl esters and acid anhydrides.

[0078] Examples of the acid anhydride include maleic anhydride, succinic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, and hexahydrophthalic anhydride, and preferably maleic anhydride.

[0079] The mixing ratio of the acid anhydride relative to the hydroxyl groups in the vinyl ester is, for example, 10% or more, or preferably 20% or more, and for example, 80% or less, or preferably 50% or less.

[0080] In the above reaction, the reaction temperature is, for example, 60°C or higher and, for example, 100°C or lower.

[0081] This gives an acid-modified vinyl ester.

[0082] The acid value of the acid-modified vinyl ester (measurement method: in accordance with JIS K6901 (2008), the same applies below) is, for example, 40 mgKOH / g or more, preferably 50 mgKOH / g or more, and for example, 100 mgKOH / g or less, preferably 90 mgKOH / g or less.

[0083] The acid value of the unmodified vinyl ester is, for example, 1 mgKOH / g or more, preferably 5 mgKOH / g or more, and for example, 20 mgKOH / g or less, preferably 10 mgKOH / g.

[0084] Of these vinyl esters, acid-modified vinyl esters are preferable.

[0085] The vinyl esters can be used alone or in combination of two or more kinds.

[0086] A hydroxyl group-containing polymerizable monomer is included as a part of the polymerizable monomer. Specifically, the polymerizable monomer includes a hydroxyl group-containing polymerizable monomer and other polymerizable monomers.

[0087] Examples of the hydroxyl group-containing polymerizable monomer include hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, and hydroxybutyl (meth)acrylate.

[0088] The hydroxyl group-containing polymerizable monomer is preferably 2-hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, or a combination of these, more preferably 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, or a combination of these, and even more preferably 2-hydroxyethyl methacrylate alone or 2-hydroxypropyl methacrylate alone.

[0089] Examples of other polymerizable monomers include styrene-based monomers such as styrene, α-methylstyrene, α-ethylstyrene, vinyltoluene, t-butylstyrene, and chlorostyrene; alkyl (meth)acrylate esters such as methyl (meth)acrylate, ethyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, isobutyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, and stearyl (meth)acrylate; allyl (meth)acrylate esters such as allyl (meth)acrylate; cyclohexyl (meth)acrylate, benzyl (meth)acrylate, isobornyl (meth)acrylate, glycidyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentanyl (meth)acrylate, and dicyclopentenyloxyethyl (meth)acrylate. Examples of the methacrylic acid ester include (meth)acrylic acid esters having a ring structure such as 2-methoxyethyl (meth)acrylate and 2-ethoxyethyl (meth)acrylate, (meth)acrylic acid alkoxyalkyl esters such as dimethylaminoethyl (meth)acrylate and diethylaminoethyl (meth)acrylate, (meth)acrylic acid aminoalkyl esters and chloride salts thereof, (meth)acrylic acid ester monomers such as (meth)acrylic acid fluoroalkyl esters such as trifluoroethyl (meth)acrylate and heptadecafluorodecyl (meth)acrylate, and polyfunctional (meth)acrylic acid esters of alkane glycol di(meth)acrylate (e.g., ethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, etc.) and polyoxyalkylene di(meth)acrylate (e.g., diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, etc.).

[0090] The other polymerizable monomers can be used alone or in combination of two or more kinds.

[0091] As the other polymerizable monomer, preferably, a styrene-based monomer is used, and more preferably, styrene is used.

[0092] That is, in the polymerizable monomer, the hydroxyl group-containing polymerizable monomer is preferably 2-hydroxyethyl (meth)acrylate or hydroxypropyl (meth)acrylate, and the other polymerizable monomer is preferably styrene.

[0093] This can improve the adhesion between the molded article and the top coat.

[0094] The mixing ratio of the hydroxyl group-containing polymerizable monomer relative to 100 parts by mass of the polymerizable monomer is, for example, 10 parts by mass or more, preferably 30 parts by mass or more, more preferably 45 parts by mass or more, and for example, 90 parts by mass or less, preferably 70 parts by mass or less, more preferably 55 parts by mass or less.

[0095] The blending ratio of the polymerizable monomer is, for example, 70 parts by mass or more, preferably 80 parts by mass or more, more preferably 100 parts by mass or more, and for example, 150 parts by mass or less, preferably 120 parts by mass or less, per 100 parts by mass of at least one selected from the group consisting of unsaturated polyesters and vinyl esters.

[0096] The thermosetting resin composition preferably also contains a shrinkage reducing agent.

[0097] When a molded article is obtained using this thermosetting resin composition, the low shrinkage agent is blended in order to suppress cure shrinkage and thermal shrinkage of the molded article.

[0098] Examples of the low shrinkage agent include polyethylene, polystyrene, styrene-based thermoplastic elastomers, crosslinked polystyrene, polyvinyl acetate-polystyrene block copolymers, polyvinyl acetate, polymethyl methacrylate, and saturated polyester resins.

[0099] Examples of styrene-based thermoplastic elastomers include styrene-butadiene block copolymer elastomers, styrene-isoprene block copolymer elastomers, styrene-ethylene / butylene block copolymer elastomers, and styrene-ethylene / propylene-styrene block copolymer elastomers, and preferably, styrene-ethylene / propylene-styrene block copolymer elastomers. Commercially available examples of such styrene-based thermoplastic elastomers include D1101, D1102, D1155, DKX405, DX410, DX415, D1192, D1161, D1171, G1651, G1652, G1654, G1701, and G1730 (all manufactured by Kraton Elastomers), Asaprene T411, Asaprene T432, Tufprene A, Tufprene 125, Tufprene 126S, Tuftec H1041, Tuftec H1043, and Tuftec H1052 (all manufactured by Asahi Kasei Corporation).

[0100] The styrene content in the styrene-based thermoplastic elastomer is, for example, 5% by mass or more and, for example, 50% by mass or less.

[0101] Moreover, the cross-linked polystyrene may be a commercially available product, and specific examples thereof include SGP-70C (average particle size: 20 μm) and SGP-150C (average particle size: 55 μm) (both manufactured by Soken Chemical Industries, Ltd.).

[0102] The low shrinkage agent is preferably polystyrene.

[0103] The low profile agents can be used alone or in combination of two or more.

[0104] The mixing ratio of the low shrinkage agent is, for example, 1 part by mass or more, preferably 5 parts by mass or more, and for example, 20 parts by mass or less, preferably 10 parts by mass or less, relative to 100 parts by mass of the total amount of at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer.

[0105] The thermosetting resin composition preferably contains a silane coupling agent.

[0106] If the thermosetting resin composition contains a silane coupling agent, the mechanical strength of the molded article can be improved, and in the case of this paint molded article, the adhesion between the molded article and the top coat that covers the surface of the molded article can be improved.

[0107] Examples of the silane coupling agent include silane coupling agents having a vinyl group, such as vinyltrichlorosilane and vinyltriethoxysilane; silane coupling agents having an epoxy group, such as 3-glycidoxypropyltrimethoxysilane and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane; silane coupling agents having an amino group, such as 3-aminopropyltrimethoxysilane and N-2-(aminoethyl)-3-aminopropyltriethoxysilane; silane coupling agents having a (meth)acryloyl group, such as 3-methacryloxypropyltrimethoxysilane and 3-methacryloxypropylmethyldimethoxysilane; and titanate-based coupling agents, preferably silane coupling agents having a (meth)acryloyl group, more preferably 3-methacryloxypropyltrimethoxysilane.

[0108] The silane coupling agents can be used alone or in combination of two or more kinds.

[0109] The blending ratio of the silane coupling agent is, for example, 1 part by mass or more, preferably 2 parts by mass or more, more preferably 3 parts by mass or more, and for example, 10 parts by mass or less, preferably 5 parts by mass or less, relative to 100 parts by mass of the total amount of at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer.

[0110] The thermosetting resin composition can be obtained by blending at least one selected from the group consisting of unsaturated polyesters and vinyl esters, a polymerizable monomer, a low shrinkage agent which is blended as necessary, and a silane coupling agent which is blended as necessary, in the blending ratio described above.

[0111] This results in a thermosetting resin composition.

[0112] If necessary, the thermosetting resin composition may contain additives such as a polymerization inhibitor, a curing agent, a release agent, a filler, a thickener, a colorant, a wetting and dispersing agent, a separation prevention agent, a flame retardant, etc. These additives may be used alone or in combination of two or more kinds.

[0113] Examples of the polymerization inhibitor include hydroquinone compounds such as hydroquinone, methylhydroquinone, and t-butylhydroquinone, benzoquinone compounds such as p-benzoquinone and methyl-p-benzoquinone, catechol compounds such as t-butylcatechol, phenol compounds such as 2,6-di-t-butyl-4-methylphenol and 4-methoxyphenol, and 1-oxyl-2,2,6,6-tetramethylpiperidine, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-ol, 4-hydroxy-2,2, 6,6-tetrapiperidine-1-oxyl, 4-methoxy-2,2,6,6-tetramethylpiperidine-1-oxyl, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl-acetate, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl-2-ethylhexanoate, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl-stearate, 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl-4-t-butylbenzoate, bis(1-oxyl-2,2,6,6-tetramethylpiperidinyl) Bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) succinate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) adipate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) sebacate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) n-butylmalonate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) phthalate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) isophthalate, bis(1-oxyl-2,2,6 ,6-tetramethylpiperidin-4-yl) terephthalate, bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) hexahydroterephthalate, N,N'-bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) adipamide, N-bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) caprolactam, N-bis(1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl) dodecyl succinimide, 2,4,6-tris-[N-butyl-N-(1-oxyl-2,2,6,Examples of the N-oxyl compounds include 1-oxyl-2,2,6,6-tetramethylpiperidin-4-yl)-s-triazine and 1-oxyl-2,2,6,6-tetramethylpiperidin-4-one, and preferably, benzoquinone compounds, and more preferably, p-benzoquinone.

[0114] The mixing ratio of the polymerization inhibitor is, for example, 0.01 part by mass or more, preferably 0.03 part by mass or more, and for example, 5 parts by mass or less, preferably 1 part by mass or less, relative to 100 parts by mass of the total amount of the at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer.

[0115] Examples of the curing agent include benzoyl peroxide, t-butylperoxyisopropyl monocarbonate, t-amylperoxyisopropyl monocarbonate, t-hexylperoxyisopropyl monocarbonate, 1,1-bis(t-butylperoxy)cyclohexane, t-butylperoxy-2-ethylhexanoate, amylperoxy-2-ethylhexanoate, 2-ethylhexylperoxy-2-ethylhexanoate, t-butylperoxybenzo ...2-ethylhexylperoxy-2-ethylhexanoate, 2-ethylhexylperoxy-2-ethylhexanoate, 2-ethylhexylperoxy-2-ethylhexanoate, 2-ethylhexylperoxy-2-ethylhexanoate, 2-ethylhexylperoxy-2-ethylhexanoate, 2 Examples of peroxides include peroxyisopropyl monocarbonate such as t-butylperoxyisopropyl monocarbonate, t-amylperoxyisopropyl monocarbonate, t-hexylperoxyisopropyl monocarbonate, and t-butylperoxybenzoate, and preferably t-hexylperoxybenzoate.

[0116] The mixing ratio of the curing agent is, for example, 0.5 parts by mass or more, preferably 0.7 parts by mass or more, and for example, 5 parts by mass or less, preferably 3 parts by mass or less, relative to 100 parts by mass of the total amount of the at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer.

[0117] The curing agents can be used alone or in combination of two or more kinds.

[0118] Examples of the release agent include fatty acids such as stearic acid and lauric acid, fatty acid metal salts such as zinc stearate and calcium stearate, and compounds such as paraffin, liquid wax, fluoropolymers, silicon-based polymers, and alkylammonium salts. Of these, fatty acid metal salts are preferred, and zinc stearate is more preferred.

[0119] The mixing ratio of the release agent is, for example, 1 part by mass or more, preferably 3 parts by mass or more, and for example, 10 parts by mass or less, relative to 100 parts by mass of the total amount of the at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer.

[0120] The release agents can be used alone or in combination of two or more kinds.

[0121] Examples of the filler include inorganic fillers such as oxides such as alumina and titania, hydroxides such as magnesium hydroxide and aluminum hydroxide, carbonates such as calcium carbonate, sulfates such as barium sulfate, silica (e.g., crystalline silica, fused silica, fumed silica, dry silica (aerosil), etc.), glass powder, hollow fillers such as glass balloons, silica balloons, and alumina balloons, silicates such as silica sand, diatomaceous earth, mica, clay, kaolin, and talc, fluorides such as fluorite, phosphates such as calcium phosphate, and clay minerals such as smectite, and preferably carbonates, and more preferably calcium carbonate.

[0122] The mixing ratio of the filler is, relative to 100 parts by mass of the total amount of at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer, for example, 1 part by mass or more, preferably 10 parts by mass or more, more preferably 50 parts by mass or more, and even more preferably 100 parts by mass or more, and for example, 300 parts by mass or less, preferably 200 parts by mass or less.

[0123] The fillers can be used alone or in combination of two or more.

[0124] The thickener is blended in order to thicken the thermosetting resin composition to a viscosity suitable for heat compression molding, and is preferably blended before (preferably immediately before) impregnating the thermosetting resin composition into reinforcing fibers (described later). Examples of the thickener include alkaline earth metal oxides such as magnesium oxide, alkaline earth metal hydroxides such as magnesium hydroxide and calcium hydroxide, and polyisocyanate compounds such as diphenylmethane diisocyanate (MDI), and preferably alkaline earth metal oxides, and more preferably magnesium oxide.

[0125] The mixing ratio of the thickener is, for example, 0.5 parts by mass or more, preferably 0.7 parts by mass or more, and for example, 5 parts by mass or less, preferably 3 parts by mass or less, relative to 100 parts by mass of the total amount of the at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer.

[0126] The thickeners can be used alone or in combination of two or more kinds.

[0127] The colorant is not particularly limited, and examples thereof include titanium oxide, polyester toner (polyester colorant containing titanium oxide and / or carbon black), and preferably polyester toner.

[0128] The mixing ratio of the colorant is, for example, 1 part by mass or more, preferably 3 parts by mass or more, and for example, 20 parts by mass or less, preferably 10 parts by mass or less, relative to 100 parts by mass of the total amount of the at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer.

[0129] The colorants can be used alone or in combination of two or more kinds.

[0130] The wetting dispersant is blended to improve wettability, and examples of the wetting dispersant include known wetting dispersants such as polyester phosphate. In addition, the wetting dispersant may be a commercially available product, and specifically, BYK-W996, BYK-9010 (manufactured by BYK-Chemie) and the like are used.

[0131] The mixing ratio of the wetting and dispersing agent is, for example, 0.1 parts by mass or more, preferably 0.5 parts by mass or more, and for example, 10 parts by mass or less, preferably 3 parts by mass or less, relative to 100 parts by mass of the total amount of the at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer.

[0132] The wetting and dispersing agents can be used alone or in combination of two or more kinds.

[0133] The separation inhibitor is blended to prevent separation of the thermosetting resin composition, and examples thereof include a block copolymer of styrene and vinyl acetate. In addition, a commercially available product can be used as the separation inhibitor, and specifically, BYK-W972 (manufactured by BYK-Chemie) and the like are used.

[0134] The mixing ratio of the separation prevention agent is, for example, 0.1 parts by mass or more, preferably 0.5 parts by mass or more, and for example, 10 parts by mass or less, preferably 3 parts by mass or less, relative to 100 parts by mass of the total amount of the at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer.

[0135] The separation inhibitors can be used alone or in combination of two or more kinds.

[0136] Examples of the flame retardant include halogen-based flame retardants such as bromine-based flame retardants, and non-halogen-based flame retardants such as phosphorus-based flame retardants, inorganic flame retardants, and nitrogen compound-based flame retardants.

[0137] The blending ratio of the flame retardant is, for example, 1 part by mass or more, preferably 5 parts by mass or more, and for example, 50 parts by mass or less, preferably 20 parts by mass or less, relative to 100 parts by mass of the total amount of the at least one selected from the group consisting of unsaturated polyesters and vinyl esters and the polymerizable monomer.

[0138] The flame retardants can be used alone or in combination of two or more kinds.

[0139] In addition, the thermosetting resin composition may contain additives such as a pattern material, an antibacterial agent, a hydrophilic agent, a photocatalyst, an ultraviolet absorber, an ultraviolet stabilizer, an antistatic agent, a thixotropic agent, a thixotropic stabilizer, a polymerization accelerator, etc., as long as the effects of the present invention are not impaired. These additives may be used alone or in combination of two or more kinds.

[0140] In such a thermosetting resin composition, the mixing ratio of at least one selected from the group consisting of unsaturated polyesters and vinyl esters is, for example, 5 mass% or more, preferably 10 mass% or more, and for example, 40 mass% or less, and for example, 20 mass% or less.

[0141] The blending ratio of the polymerizable monomer in the thermosetting resin (the total amount of the polymerizable monomer and at least one selected from the group consisting of unsaturated polyesters and vinyl esters) is, for example, 44 mass% or more and, for example, 54 mass% or less.

[0142] When the blending ratio of the polymerizable monomer is within the above range, excellent adhesive strength is obtained.

[0143] In the obtained thermosetting resin composition, a hydroxyl group-containing polymerizable monomer is contained as a part of the polymerizable monomer, and therefore, according to this thermosetting resin composition, a coated molded article having excellent adhesion between the molded article and a top coat that covers the surface of the molded article can be obtained.

[0144] On the other hand, if all of the polymerizable monomers are hydroxyl group-containing polymerizable monomers, the adhesion cannot be improved from the viewpoint of compatibility.

[0145] Examples of reinforcing fibers include inorganic fibers such as glass fibers, carbon fibers, metal fibers, and ceramic fibers; organic fibers such as polyvinyl alcohol fibers, polyester fibers, polyamide fibers, fluororesin fibers, and phenol fibers; and natural fibers such as hemp and kenaf. Preferably, inorganic fibers are used, and more preferably, glass fibers are used.

[0146] The shape of these reinforcing fibers may be, for example, a cloth shape such as a roving cloth; a mat shape such as a chopped strand mat, a preformable mat, a continuous strand mat, or a surfacing mat; a strand shape such as a chopped strand; a roving shape; a nonwoven fabric shape; or a paper shape, and preferably a roving shape.

[0147] The length of the reinforcing fibers is not particularly limited and is, for example, 0.1 mm or more, preferably 1.5 mm or more, more preferably 5 mm or more, and further preferably 15 mm or more, and for example, 80 mm or less, preferably 40 mm or less.

[0148] The molding material is obtained, for example, in the form of a sheet by impregnating reinforcing fibers with a thermosetting resin composition.

[0149] The mixing ratio of the reinforcing fibers (for example, when the reinforcing fibers are glass fibers, hereinafter referred to as the glass content) is, relative to the total amount of the thermosetting resin composition and the reinforcing fibers, for example, 5 mass% or more, preferably 10 mass% or more, more preferably 20 mass% or more, and for example, 50 mass% or less, preferably 35 mass% or less.

[0150] Methods for preparing the molding material include known methods, such as SMC (sheet molding compound), TMC (thick molding compound), BMC (bulk molding compound), etc., and preferably SMC.

[0151] This results in a molding material containing the thermosetting resin composition and the reinforcing fibers.

[0152] The obtained molding material contains the above-mentioned thermosetting resin composition, and therefore, the molding material can provide a paint-coated molded article having excellent adhesion between the molded article and a top coat that covers the surface of the molded article.

[0153] Next, such a molding material is aged, for example, at 20° C. to 50° C. for 8 hours to 120 hours to thicken the material so that it can be subjected to heat compression molding (described later).

[0154] As a result, the molding material is maintained in a shape, for example, a sheet shape. That is, the molding material has a sheet shape.

[0155] The molded product can be obtained by subjecting the molding material to heat compression molding using a known method.

[0156] The conditions for the hot compression molding are appropriately set depending on the purpose and application. Specifically, the molding temperature is, for example, 100°C or higher and, for example, 200°C or lower, and the molding pressure is, for example, 0.1 MPa or higher, preferably 1 MPa or higher, more preferably 5 MPa or higher, and, for example, 20 MPa or lower, preferably 15 MPa or lower.

[0157] This causes the molding material to harden and be molded.

[0158] This results in a molded article containing a cured product of the molding material.

[0159] The flexural strength of the molded product (based on JIS K7074 (1988)) is, for example, 100 MPa or more, preferably 130 MPa or more, more preferably 140 MPa or more, and even more preferably 150 MPa or more, and is, for example, 500 MPa or less.

[0160] The molded article has a flexural modulus (in accordance with JIS K7074 (1988)) of, for example, 5 GPa or more, preferably 10 GPa or more, and for example, 45 GPa or less.

[0161] The molded article has a thickness of, for example, 1 mm or more, preferably 3 mm or more, and for example, 10 mm or less.

[0162] The obtained molded article contains a cured product of the above molding material, and therefore, according to this molded article, a painted molded article having excellent adhesion between the molded article and the top coat that covers the surface of the molded article can be obtained.

[0163] The top coat may be, for example, a urethane paint which is a reaction product between a polyol component (base) and an isocyanate component (curing agent). The urethane paint may be of known types such as a two-liquid type and a one-liquid type.

[0164] The top coat has a thickness of, for example, 10 μm or more, preferably 30 μm or more, and for example, 1000 μm or less.

[0165] The coated molded article is obtained by applying a top coat to the surface of the molded article, and drying and heating the top coat as necessary.

[0166] In the coated molded article, the molded article contains a cured product of the above molding material, and therefore, in the coated molded article, the molded article has excellent adhesion to the top coat that covers the surface of the molded article.

[0167] More specifically, the adhesion can be improved by reacting the hydroxyl groups derived from the hydroxyl group-containing polymerizable monomer in the molded article with the isocyanate component in the top coat. EXAMPLES

[0168] Specific numerical values ​​of the blending ratio (content ratio), physical property values, parameters, etc. used in the following description can be replaced with the upper limit values ​​(numerical values ​​defined as "not more than" or "less than") or lower limit values ​​(numerical values ​​defined as "not less than" or "exceeding") of the corresponding blending ratio (content ratio), physical property values, parameters, etc. described in the above "Form for carrying out the invention." In addition, unless otherwise specified in the following description, "parts" and "%" are based on mass.

[0169] 1.Details of ingredients 2HEMA: 2-hydroxyethyl methacrylate 2HPMA: 2-hydroxypropyl methacrylate Perhexyl Z: t-hexyl peroxybenzoate, manufactured by NOF Corporation Silane coupling agent: 3-methacryloxypropyltrimethoxysilane (product name: KBM-503, manufactured by Shin-Etsu Chemical Co., Ltd.)

[0170] 2. Preparation of Unsaturated Polyesters and Vinyl Esters Synthesis Example 1 (Unsaturated polyester) A flask equipped with a thermometer, a nitrogen gas inlet tube, a reflux condenser, and a stirrer was used as a reactor. 332 parts by mass of isophthalic acid, 419 parts by mass of propylene glycol, and 521 parts by mass of neopentyl glycol were charged into this reactor, and polycondensation reaction was carried out at a temperature of 200 to 210°C while stirring under a nitrogen gas atmosphere. When the acid value reached 10 mgKOH / g, the mixture was cooled to 150°C, 785 parts by mass of maleic anhydride was charged, and the reaction was carried out again at 210 to 220°C to obtain an unsaturated polyester with an acid value of 27.0 mgKOH / g.

[0171] Synthesis Example 2 (Acid-modified vinyl ester) In a reactor similar to that of Synthesis Example 1, 1850 parts by mass of bisphenol A type epoxy resin (epoxy equivalent 185), 317 parts by mass of bisphenol A, and 0.5 parts by mass of triethylbenzylammonium chloride as a catalyst were charged, and while blowing in nitrogen, the mixture was reacted at 170°C for 5 hours to obtain an epoxy resin with an epoxy equivalent of 300. After cooling to 120°C, 2.0 parts by mass of hydroquinone as a polymerization inhibitor, 5.0 parts by mass of triethylbenzylammonium chloride as a catalyst, and 636 parts by mass of methacrylic acid were added, and while blowing in air, the mixture was reacted at 110°C for 8 hours to obtain a vinyl ester with an acid value of 6.7 mgKOH / g.

[0172] To this vinyl ester, 354 parts by mass of maleic anhydride was added, and the mixture was reacted at 80° C. to obtain an acid-modified vinyl ester having an acid value of 71.2 mg KOH / g.

[0173] 3. Preparation of thermosetting resin composition and molding material Working Example 2 ~Example 5, Example 10, Comparative Example 1 to Comparative Example 11 According to the compounding ratios shown in Tables 1 and 2, each component was thoroughly mixed using a high-speed mixer to prepare a thermosetting resin composition. The mixture was fed onto roving glass cut to a specified size (fiber length 1 inch) using a known SMC impregnation machine to obtain a sheet-shaped molding material. The obtained molding material was aged at 40°C for 3 days to complete thickening.

[0174] 4. Manufacturing of molded products The molding materials of each Example and Comparative Example were subjected to heat compression molding (molding pressure: 10 MPa, molding temperature: 140°C, pressure retention time: 6 minutes) using a 300 mm x 300 mm flat mold to obtain a flat molded product with a thickness of 4 mm.

[0175] 5. Manufacturing of painted molded products PG80 (two-liquid type acrylic urethane paint, manufactured by Kansai Paint Co., Ltd.) and a hardener were mixed in the mixing ratio specified by the manufacturer and spray-applied to the surface of the molded article of each Example and Comparative Example to a film thickness of approximately 40 to 50 μm.

[0176] This produced a coated molded article having a molded article and a top coat covering the surface of the molded article.

[0177] In Comparative Example 2, 10 parts of 2HEMA were blended with PG80, and in Comparative Example 3, 20 parts of 2HEMA were blended with PG80.

[0178] 6. Evaluation <Bending strength> The flexural strength of each molded article of each Example and Comparative Example was measured in accordance with JIS K7074 (1988). The results are shown in Tables 1 and 2.

[0179] <Flexural modulus> The flexural modulus of each molded article in each Example and Comparative Example was measured in accordance with JIS K7074 (1988). The results are shown in Tables 1 and 2.

[0180] <Izod impact test> The molded products of each Example and Comparative Example were subjected to an Izod impact test in accordance with JIS K7062 (1992). The test was performed under flatwise, unnotched conditions. The results are shown in Tables 1 and 2.

[0181] <Adhesion> (Grid Test) For the coated molded articles of each Example and Comparative Example, the adhesion of the topcoat to the molded article was evaluated by a cross-cut test (1 mm square) in accordance with JIS K5400. The results are shown in Tables 1 and 2.

[0182] (Adhesion strength) For each molded product of each Example and Comparative Example, a 6φ stud (screw) was attached, the screw was attached to the surface of the top coat with an epoxy adhesive, and a tensile test was performed vertically to measure the adhesion strength. The results are shown in Tables 1 and 2.

[0183] <Boilability> The molded products of each Example and Comparative Example were subjected to a one-sided boiling test in hot water at 80° C. for 200 hours, and the presence or absence of blistering of the coating film was visually confirmed. The results are shown in Tables 1 and 2.

[0184] [Table 1]

[0185] [Table 2]

Claims

1. A molded article and a top coat containing a urethane-based paint that covers a surface of the molded article, The molded article includes a cured product of a molding material, The molding material includes a thermosetting resin composition and a reinforcing fiber, The thermosetting resin composition includes a thermosetting resin including at least one selected from the group consisting of unsaturated polyesters and vinyl esters, and a polymerizable monomer; A part of the polymerizable monomers includes a hydroxyl group-containing polymerizable monomer, A coated molded product, wherein the blending ratio of the hydroxyl group-containing polymerizable monomer is 30 parts by mass or more and 90 parts by mass or less based on 100 parts by mass of the polymerizable monomer.

2. A molding material for molding the coated molded product of claim 1, The thermosetting resin composition and the reinforcing fiber are included, The thermosetting resin composition includes a thermosetting resin including at least one selected from the group consisting of unsaturated polyesters and vinyl esters, and the polymerizable monomer, A part of the polymerizable monomers includes a hydroxyl group-containing polymerizable monomer, A molding material, characterized in that the blending ratio of the hydroxyl group-containing polymerizable monomer is 30 parts by mass or more and 90 parts by mass or less per 100 parts by mass of the polymerizable monomer.

3. A thermosetting resin composition contained in the molding material according to claim 2, A thermosetting resin containing at least one selected from the group consisting of unsaturated polyesters and vinyl esters, and the polymerizable monomer; A part of the polymerizable monomers includes a hydroxyl group-containing polymerizable monomer, A thermosetting resin composition, wherein the blending ratio of the hydroxyl group-containing polymerizable monomer is 30 parts by mass or more and 90 parts by mass or less based on 100 parts by mass of the polymerizable monomer.

4. The polymerizable monomer includes other polymerizable monomers, the hydroxyl group-containing polymerizable monomer is 2-hydroxyethyl (meth)acrylate or hydroxypropyl (meth)acrylate, The thermosetting resin composition according to claim 3 , wherein the other polymerizable monomer is styrene.

5. 5. The thermosetting resin composition according to claim 3, wherein the blending ratio of the polymerizable monomer in the thermosetting resin is 44 mass % or more and 54 mass parts or less.

6. The thermosetting resin composition according to any one of claims 3 to 5, further comprising a silane coupling agent.

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