POLYVINYL CHLORIDE-POLYSTYRENE BLOCK COPOLYMER, POLYVINYL CHLORIDE-POLYVINYL ACETATE BLOCK COPOLYMER AND THEIR PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a polyvinyl chloride-polystyrene block copolymer, a polyvinyl chloride-polyvinyl acetate block copolymer both having excellent physicochemical properties, and a method for producing them. SOLUTION: This block copolymer is an AB-type polyvinyl chloride- polystyrene block copolymer or polyvinyl chloride-polyvinyl acetate block copolymer and is obtained by initiating a polymerization reaction by light-irradiating to vinyl chloride monomer using benzyl N,N-diethyldithiocarbamate as a radical polymerization initiator, generating a polyvinyl chloride and initiating a polymerization of styrene or vinyl acetate by light-irradiating to the polyvinyl chloride and styrene or vinyl acetate.