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A photopolymeriziable thermosetting resin composition comprising (A) a mixture consisting of (a) an active energy ray-setting resin and obtained by reacting an unsaturated monobasic acid copolymer resin with a cycloaliphatic epoxy group-containing unsaturated compound or reacting a cycloaliphatic ep

A photopolymeriziable thermosetting resin composition comprising (A) a mixture consisting of (a) an active energy ray-setting resin and obtained by reacting an unsaturated monobasic acid copolymer resin with a cycloaliphatic epoxy group-containing unsaturated compound or reacting a cycloaliphatic epoxy group containing copolymer resin with an acid group-containing unsaturated compound and (b) an photosensitive prepolymer obtained by esterifying a novolak type epoxy compound with an alpha-beta-unsaturated carboxylic acid and then further reacting with polybasic acid anhydride (and in one embodiment further reacting with an unsaturated isocyanate).

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1. A photopolymerizable thermosetting resin composition comprising:(A) a mixture of an active energy ray-setting resin (a) and a photosensitive prepolymer (b) having an acid value of 40-160 mg KOH/g, (B) a diluent, (C) a photopolymerization initiator, (D) a setting adhesion-imparting agent, and (E)

1. A photopolymerizable thermosetting resin composition comprising:(A) a mixture of an active energy ray-setting resin (a) and a photosensitive prepolymer (b) having an acid value of 40-160 mg KOH/g, (B) a diluent, (C) a photopolymerization initiator, (D) a setting adhesion-imparting agent, and (E) an epoxy group containing compound, wherein said active energy ray-setting resin (a) is selected from the group consisting of (i) an unsaturated resin (a-1) obtained by reacting an unsaturated monobasic acid copolymer resin with a cycloaliphatic epoxy group-containing unsaturated compound and (ii) an unsaturated resin (a-2) obtained by reacting a cycloaliphatic epoxy group-containing copolymer resin with an acid group-containing unsaturated compound; said photosensitive prepolymer (b) is selected from the group consisting of (i) a prepolymer (b-1) obtained by esterifying an novolak epoxy compound with an .alpha.,.beta.-unsaturated carboxylic acid to form a total epoxy groups-esterified product, followed by reacting the total epoxy groups-esterified product thus obtained with a saturated or unsaturated polybasic acid anhydride, (ii) a prepolymer (b-2) obtained by esterifying a novolak epoxy compound with an .alpha.,.beta.-unsaturated carboxylic acid to form a partial epoxy groups-esterified product, followed by reacting the partial epoxy groups-esterified product thus obtained with a saturated or unsaturated polybasic acid anhydride, and (iii) a prepolymer (b-3) obtained by reacting a diisocyanate with a (meth)acrylate having one hydroxyl group in one molecule to obtain a first reaction product, followed by reacting said first reaction product with the secondary hydroxy groups of a total epoxy groups-esterified product obtained by esterifying an novolak epoxy compound with an .alpha.,.beta.-unsaturated carboxylic acid to obtain a second reaction product, and then reacting said second reaction product with a saturated or unsaturated polybasic acid anhydride; and the ingredients (a) and (b) are compounded at a compounding ratio of 5-100 parts by weight of (b) per 100 parts by weight of (a).