Process for the preparation of polysuccinimide, polyaspartic acid and their salts

US5468838A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunther Boehmke · Leverkusen, DE
• Gerd Schmitz · Leverkusen, DE

Key dates

• Filing date: Mar 14, 1994
• Grant date: Nov 21, 1995
• Expiry date: Mar 14, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D3/3719
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Polysuccinimide, polyaspartic acid and their salts are prepared by reaction of maleic anhydride and ammonia, polycondensation of the resulting product in the presence of a solubilizing agent and, if appropriate, hydrolysis.