Patent ID: 7781495

Claim:
A composition curable by radical photo curing and cationic photo curing in combination, comprising the under-mentioned components (A), (B), (C) and (D) as essential components: (A) a vinyl polymer having two or more groups represented by general formula (1): —OC(O)C(R a )=CH 2 (1) wherein R a represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, per molecule, the group represented by general formula (1) being present at one or more molecular ends; (B) an epoxy compound and/or an oxetane compound; (C) a radical photopolymerization initiator; and (D) a cationic photopolymerization initiator, and wherein the vinyl monomer constituting the main chain of component (A) comprises a (meth)acrylic monomer as a main component and a (meth)acryloyl group exists at the molecular end.