Patent ID: 6235815
Filing Date: 2001-05-22
Classification: B32B,C08J,C08L,F42B

Abstract:
A polymeric mixture consisting essentially of thermoplastic starch containing, as a plasticizer responsible for converting at least one of native starch or a starch derivative into the thermoplastic starch, at least one hydrophobic biodegradable polymer selected from the group consisting of aliphatic polyesters, copolyesters having aliphatic and aromatic blocks, polyester amides, polyethylene oxide polymers, polyglycols, and mixtures thereof,wherein the thermoplastic starch is formed by heating and mixing the native starch or starch derivative with the biodegradable polymer in a manner so as to yield a thermoplastic starch melt having a water content of less than 5% by weight based on the total weight of the polymeric mixture and prior to cooling the melt.