Patent ID: 6844380
Filing Date: 2005-01-18
Classification: C08J,C08L

Abstract:
1. A method of preparing a thermoplastic starch and synthetic polymer blend, said method comprising the steps of: (a) providing a starch suspension comprising starch, water and a plasticizer; (b) obtaining a thermoplastic starch from said starch suspension by causing gelatinization and plasticization of said starch suspension by exerting heat and pressure on said starch suspension in a first extrusion unit; (c) venting off residual water from said thermoplastic starch to obtain a substantially moisture-free thermoplastic starch; (d) obtaining a melt of a synthetic polymer or polymer blend in a second extrusion unit; (e) combining said melt obtained from step (d) with said substantially moisture-free thermoplastic starch obtained from step (c) to obtain a thermoplastic starch and synthetic polymer blend.