Additives for synthetic resins.

摘要

An additive for synthetic resins contains a block copolymer having as its constituent segments (a) polyester segments as obtainable by ring-opening polymerization of epsilon -aliphatic lactone and (b) liquid rubber compound segments. One or of the polyester segments are connected to liquid rubber compound segments through ester bonds and at least one of the polyester segments has a reactive group such as a vinyl group, epoxy group, isocyanate group or carboxyl group.