(METH)ACRYL-BASED BLOCK COPOLYMER AND ACTIVE-ENERGY-RAY CURING COMPOSITION CONTAINING SAID (METH)ACRYL-BASED BLOCK COPOLYMER

摘要

Provided is a (meth)acryl-based block copolymer that is useful in an optical adhesive composition, and with which a cured article that has a superior anti-heat/humidity bleaching properties and that resists bleaching under high-temperature, high-humidity conditions is obtained. The (meth)acryl-based block copolymer contains a methacryl-based polymer block (A) having an active-energy-ray cured group including a partial structure represented by general formula (1) and an acryl-based polymer block (B) that does not have the active-energy-ray cured group, wherein the acryl-based polymer block (B) contains a monomer unit (b1) derived from acrylic acid alkoxyester. (In formula (1), R¹ represents a hydrogen atom or a hydrocarbon group having 1-20 carbon atoms.)