Process for preparing polysuccinimide and polyaspartic acid

US5610255A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Torsten Groth · Reinbek, DE
• Winfried Joentgen · Neunburg vorm Wald, DE
• Nikolaus M uller · Monheim, DE
• Ulrich Liesenfelder · Bensberg, DE

Key dates

• Filing date: Aug 18, 1995
• Grant date: Mar 11, 1997
• Expiry date: Aug 18, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23F11/173
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Polysuccinimide and polyaspartic acid are prepared by polymerizing maleic anhydride, ammonia and water or maleic acid derivatives or fumaric acid derivatives in bulk or dissolved in solvents in a continuous kneading reactor. The polysuccinimide formed can be converted into polyaspartic acid and polyaspartate salts by hydrolysis.