Patent ID: 6136097
Filing Date: 2000-10-24
Classification: B29B,B29C,C08B,C08J,C08L

Abstract:
A process for producing thermoplastic starch in granulated or fibrous form, on the basis of renewable starch-containing raw materials and optionally with solid and/or liquid additives, comprising the following process steps:a) mixing the renewable starch-containing raw materials, optionally with solid and/or liquid additives, to give a homogenous raw material mixture in a first section;b) adding a dosed amount of the raw material mixture to a second section;c) adding to the raw material mixture a dosed amount of further additives to said second section;d) heating and reacting the raw material mixture and forming a melt with a first viscosity in a third section;e) cooling and plastifying the melt in a fourth and fifth section and extruding an extrudate of the thermoplastic starch with a second viscosity which is higher than the first viscosity, at a pressure of 25 to 150 bar and at a temperature of 30.degree. to 99.degree. C.,f) conditioning the extrudate in a sixth section; andg) emitting the extrudate in a seventh section.