BIODEGRADABLE POLYESTER RESIN COMPOSITION WITH IMPROVED MECHANICAL STRENGTH, FLEXIBILITY AND TRANSPARENCY, COMPRISING POLYLACTIC ACID AND POLYOLEFIN RESIN

PURPOSE: A biodegradable polyester resin composition with good mechanical strength, flexibility and transparency is provided to be capable of forming various films having excellent physical properties by employing conventional film molding machines. CONSTITUTION: The biodegradable polyester resin composition comprises a mixture of 30-70 parts by weight of a polylactic acid and 70-30 parts by weight of an aromatic-aliphatic polyester, and 1-300 parts by weight of polyolefin resin, based on 100 parts by weight of the mixture. Particularly, in the aromatic-aliphatic polyester, the aromatic component is at least one selected from a dicarboxylic acid of ROOC-Ar-COOR', or a derivative thereof, and the aliphatic component is at least one selected from a dicarboxylic acid of ROOC(CH2)nCOOR' or a derivative thereof. The polylactic acid comprises L-, D- or L,D-lactic acid having a molecular weight of 10,000 or more. The polyolefin resin comprises -olefin constituting any one of ethylene, propylene and butadiene monomer.