Special amyloses and their use for producing biodegradable plastics

US5374304A · kind A · utility

Assignees

• Battelle Institute e.V. · DE
• EMS-CHEMIE AG · CH

Inventors

• Rainer Frische · Frankfurt, DE
• Klaus Wollmann
• Renate Gross-Lannert · Dietzenbach, DE
• Judith Schneider · Frankfurt am Main, DE
• Bernd Best · Mörfelden, DE

Key dates

• Filing date: Nov 4, 1993
• Grant date: Dec 20, 1994
• Expiry date: Nov 4, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L3/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to special amyloses for producing biodegradable, clear, transparent and flexible plastic, in particular sheets and films, which PA1 a) are swellable, but not soluble, in cold water; PA1 b) yield homogenous, flowable quasi-solutions without formation of gels if they are heated, with stirring, to temperatures above 80.degree. C., at atmospheric pressure; during cooling to a temperature of 50.degree. C., this state is maintained for at least five minutes, without gel formation or retrogradation, and the solution in a concentration between 5 and 25% is applicable to knife coating onto a plane surface with a gap width between 100 and 700 .mu.m.