Preparation of polyaspartic acid

US5830985A · kind A · utility

Assignee

• BASF SE

Inventors

• Matthias Kroner · Eisenberg, DE
• Gunnar Schornick · Neuleiningen, DE
• Hans-Jacob Feindt · Flemington, US
• Thomas A. Meyer · Zuchwil, CH
• Alfons Ludwig · Ankum, DE
• Udo Metzmann · Obrigheim, DE

Key dates

• Filing date: Feb 12, 1997
• Grant date: Nov 3, 1998
• Expiry date: Feb 12, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D3/3719
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing polyaspartic acid by polycondensation of fine-particle aspartic acid at temperatures above 150.degree. C. in the presence of acidic catalysts, wherein first contact between the acidic catalysts and the fine-particle aspartic acid takes place in the reaction zone where the polycondensation takes place.