Process for preparing polyaspartic acid

US5714558A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Torsten Groth · Reinbek, DE
• Winfried Joentgen · Neunburg vorm Wald, DE
• Nikolaus Muller · Monheim, DE

Key dates

• Filing date: Sep 7, 1995
• Grant date: Feb 3, 1998
• Expiry date: Sep 7, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/1092
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyaspartic acid is prepared by polymerization of aspartic acid, maleic acid anhydride, maleic acid or fumaric acid in a solvent at from 130.degree. C. to 300.degree. C., optionally in the presence of ammonia.