Patent ID: 8853291

Claim:
A curable resin composition, comprising: a component (A): a soluble polyfunctional (meth)acrylic acid ester copolymer which is obtained by copolymerizing components including a monofunctional (meth)acrylic acid ester (a) having an alicyclic structure, a bifunctional (meth)acrylic acid ester (b), and 2,4-diphenyl-4-methyl-1-pentene (c), has a structural unit (b1) having a reactive (meth)acrylate group derived from the bifunctional (meth)acrylic acid ester (b) in a side chain and a structural unit derived from 2,4-diphenyl-4-methyl-1-pentene (c) at an end, has a weight-average molecular weight of 3000 to 10,000, and is soluble in toluene, xylene, tetrahydrofuran, dichloroethane, or chloroform, wherein the amount of the structural unit derived from 2.4-diphenyl-4-methyl-1-pentene (c) introduced into the copolymer is, as a mole fraction M c represented by the following equation (1), 0.03 to 0.30, and the amount of the reactive (meth)acrylate group is, as a mole fraction M b1 represented by the following equation (2), 0.1 to 0.3, M c =( c )/[( a )+( b )+( c )] (1) M b1 =( b 1)/[( a )+( b )] (2) wherein, (a), (b), and (c) represent mole numbers of the structural unit derived from the monofunctional (meth)acrylic acid ester (a) having an alicyclic structure, the structural unit derived from the bifunctional (meth)acrylic acid ester (b), and the structural unit derived from 2,4-diphenyl-4-methyl-1-pentene (c), respectively, and (b1) represents a mole number of the structural unit (b1) containing a reactive (meth)acrylate group; a component (B): a polyfunctional (meth)acrylate; and a component (C): an initiator, wherein a blending amount of the component (B) is 5 to 250 parts by weight with respect to 100 parts by weight of the component (A), and a blending amount of the component (C) is 0.1 to 10 parts by weight with respect to a total of 100 parts by weight of the blending amount of the component (B) and a blending amount of the component (A), and wherein the polyfunctional (meth)acrylate of Component (B) is a monomer having two or more (meth)acryloyl groups in a molecule, the polyfunctional (meth)acrylate monomer being copolymerizable with the Component (A).