Patent ID: 6521717
Filing Date: 2003-02-18
Classification: C08L,Y10S

Abstract:
A biodegradable polyester resin composition, which comprises biodegradable polymer (A) and aliphatic polyester (B) wherein the biodegradable polymer (A) contains aromatic dicarboxylic acid as a structural unit and wherein the aliphatic polyester (B) is a polyester obtained from aliphatic dicarboxylic acid component having 2 to 6 carbon atoms and aliphatic glycol component having 2 to 4 carbon atoms, wherein said biodegradable polyester resin composition has an island-sea structure and is produced by the steps of:(a) synthesizing said biodegradable polymer (A) containing aromatic dicarboxylic acid as a structural unit; (b) synthesizing said aliphatic polyester (B); and (c) melt-kneading the resultant biodegradable polymer (A) and the resultant aliphatic polyester (B) together to form a biodegradable polyester resin composition, where said biodegradable polyester resin composition exhibits a biodegradation percentage of 60% or more as determined by the method of ISO14851, ISO14852, ISO14855 or OECD Guidelines for Testing of Chemicals (301C, Modified MITI Test).