Patent ID: 7629405

Claim:
A melt extruded starch-polyester graft copolymer composition comprising: (a) a melt extruded, thermoplastic, pre-plasticized starch which is pre-plasticized with a polyhydric alcohol and a dibasic organic acid and (b) segments of an aliphatic-aromatic polyester grafted onto the pre-plasticized starch, the aliphatic-aromatic polyester comprising where a, b, and m are 2 to 8, and x/y is between 3/2 and 10/1; wherein the copolymer composition is formed by melt extruding a reaction mixture of the pre-plasticized starch and the polyester, the reaction mixture having been extruded with heating and venting of water and unreacted dibasic organic acid from the reaction mixture.