ADDITIVES FOR SYNTHETIC RESINS

摘要

An additive for synthetic resins contains a block copolymer having as its constituent segments both polyester part obtainable by ring-opening polymerization of .epsilon.-aliphatic lactone and polydiene compound part. One or more of these polyester parts are connected to the polydiene compound part through ester bond and at least one of these polyester parts has at its end a reactive group such as vinyl group, epoxy group, isocyanate group or carboxyl group.