PHOTOCURABLE (METH)ACRYLATE AND CATIONIC MONOMERS OR PREPOLYMERS

摘要

A photocurable composition comprises (a) a (meth)acrylate functional monomer or prepolymer; (b) a cationically curable monomer or prepolymer; (c) a free-radical liberating, carbonyl containing, photoinitiator; and (d) an aromatic halonium salt whose anion is a complex metal halide. The composition solves difficulties in curing found in previous formulations and provides complete curing in air, thereby preventing tacky surfaces, as well as an accelerated cure rate and a more penetrating cure depth. Blending with between about 10% and 20% of a carboxyl-terminated nitrile rubber results in a composition suitable for bonding polybutyleneterephthalate.