Cationic biopolymers

US5962663A · kind A · utility

Assignees

• Henkel Kommanditgesellschaft auf Aktien · DE
• Norwegian Institute of Fisheries & Aquaculture Ltd. · NO

Inventors

• Rolf Wachter · Düsseldorf, DE
• Holger Tesmann · Düsseldorf, DE
• Ronald Svenning
• Ragnar Olsen · Tromsø, NO
• Even Stenberg · Tromsø, NO

Key dates

• Filing date: Mar 10, 1997
• Grant date: Oct 5, 1999
• Expiry date: Mar 10, 2017

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61Q19/08
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The invention relates to new cationic biopolymers with an average molecular weight of 800,000 to 1,200,000 Dalton, a Brookfield viscosity (1% by weight in glycolic acid) below 5,000 mPas, a degree of deacetylation of 80 to 88% and an ash content of less than 0.3% by weight which are obtained by repeatedly subjecting crustacean shells to alternate acidic and alkaline degradation under defined conditions. Compared with known cationic biopolymers of the chitosan type, the new biopolymers form clear solutions and, at the same time, show excellent film-forming properties, despite their high molecular weight.