Process for the preparation of polysuccinimide and polyaspartic acid

US5371180A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Torsten Groth · Reinbek, DE
• Winfried Joentgen · Neunburg vorm Wald, DE
• Gunter Boehmke · Leverkusen, DE
• Gerd Schmitz · Leverkusen, DE
• Hans-Joachim Traenckner · Leverkusen, DE

Key dates

• Filing date: Mar 31, 1994
• Grant date: Dec 6, 1994
• Expiry date: Mar 31, 2014

Classification

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

Abstract

Polysuccinimide is prepared by reaction of fumaric acid, maleic acid or a derivative thereof with urea, isourea, carbamic acid, ammonium carbamide, ammonium bicarbonate, diammonium carbonate or mixtures of the abovementioned substances in a reactor at temperatures of preferably 100.degree. C. to 300.degree. C. over reaction times of preferably 0.5 minute to 300 minutes.