Process for the preparation of polymers with repeating succinyl units using catalysts

US6093789A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rudiger Schubart · Wittlich, DE
• Richard Weider · Leverkusen, DE

Key dates

• Filing date: Mar 29, 1999
• Grant date: Jul 25, 2000
• Expiry date: Mar 29, 2019

Classification

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

Abstract

The invention relates to a process for preparing polymers having repeating succinyl units, especially polysuccinimide and polyaspartic acid, with increased M.sub.W values at non-increased, moderate synthesis temperatures and at the same time without increased polycondensation times, using maleic anhydride and ammonium carbonate plus a catalyst.