Patent ID: 8110380

Claim:
A starch-based biodegradable material composition comprising: an enzyme-hydrolyzed starch; and a biodegradable polyester selected from at least one of polybutylene succinate and polybutylene adipate/terephthalate, wherein said starch-based biodegradable material composition is made by a method comprising the steps of: (a) mixing a native starch with a biodegradable polyester selected from at least one of polybutylene succinate and polybutylene adipate/terephthalate so as to form a solid mixture; (b) mixing a starch-hydrolyzing enzyme with a liquid additive so as to form a liquid mixture; and (c) blending the solid mixture and the liquid mixture so as to induce hydrolysis of the native starch to form the enzyme-hydrolyzed starch; and (d) chemically blending the enzyme-hydrolyzed starch and the biodegradable polymer to form the starch-based biodegradable material; wherein the starch-hydrolyzing enzyme has an activity ranging from 15000 U to 40000 U and wherein said native starch has a weight ratio to said starch enzyme not greater than 190.