Process for the preparation of polysuccinimide, polyaspartic acid and salts thereof, and the use of these compounds

US5543490A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Torsten Groth · Reinbek, DE
• Winfried Joentgen · Neunburg vorm Wald, DE
• Hans W. Linden · Leverkusen, DE
• Nikolaus Muller · Monheim, DE
• Heinz-Joachim Rother · Krefeld, DE
• Paul Wagner · Mülheim an der Ruhr, DE
• Martin Kugler · Leichlingen, DE

Key dates

• Filing date: Dec 17, 1993
• Grant date: Aug 6, 1996
• Expiry date: Dec 17, 2013

Classification

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

Abstract

Polyaspartic acid is prepared by reacting maleic anhydride and ammonia to give maleamic acid, polymerizing the maleamic acid and subsequently hydrolyzing the product to give polyaspartic acid or a salt thereof.