Resin composition curable with an active energy ray containing graft copolymerized polymer with trunk chain containing dicyclopentenyl group

Claim 1

A resin composition curable with active energy ray, comprising: (i) a graft copolymerized polymer having a number average molecular weight of 5,000 or more and a weight average molecular weight of 50,000 or less, which comprises a trunk chain composed mainly of structural units derived from at least one monomer selected from the group consisting of a monomer containing, in the molecule, a (meth)acryloyl group and a dicyclopentenyl derivative group represented by the general formula (I): ##STR12## wherein Z represents a 5-membered ring shown by ##STR13## R 4 and R 5 each represents a hydrogen atom or an alkyl group with 1 to 3 carbon atoms, a monomer represented by the following general formula (II): ##STR14## wherein R 6 -R 13 each represents a hydrogen atom or a methyl group, alkyl methacrylates, acrylonitrile and styrene and, added thereto, graft chains having structural units derived from at least one monomer selected from the group consisting of monomers represented by the following general formulae (x) and (y): ##STR15## wherein R 1 is a hydrogen atom or an alkyl or hydroxyalkyl group having 1 to 3 carbon atoms, R 2 is a hydrogen atom or an alkyl or acrylic group having 1 to 4 carbon atoms which may have hydroxy groups, R 3 is an alkyl group having 2 to 6 carbon atoms, a halogen-substituted alkyl group having 2 to 6 carbon atoms, an alkylether group represented by the formula: --CH.sub.2).sub.n O--CH.sub.2).sub.m wherein 2≦m+n≦6, n≠0, m≠0, or a phenylalkyl group represented by the formula: ##STR16## wherein 2≦m+n≦4, or the case wherein n=0 or m=0 is contained); (ii) a linear polymer having a number average molecular weight of 50,000 or more and a weight average molecular weight of 350,000 or less and having a glass transition temperature of 60° C. or higher, which comprises structural units derived from at least one monomer selected from the group consisting of methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, benzyl methacrylate, acrylonitrile, isobornyl methacrylate, isobornyl acrylate, tricyclodecane methacrylate, tricyclodecaneoxyethyl methacrylate, styrene, dimethylaminoethyl methacrylate and cyclohexyl methacrylate, and structural units derived from at least one monomer in amounts from 5 to 30 mole percent selected from the group consisting of said monomers represented by the formula (x) and the the formula (y) described above; (iii) a monomer having ethylenically unsaturated bond, and (iv) a photopolymerization initiator capable of generating free radicals by irradiation of an active energy ray.