Process for preparing polymers which contain aspartic acid

US5594077A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Torsten Groth · Reinbek, DE
• Winfried Joentgen · Neunburg vorm Wald, DE
• Paul Wagner · Mülheim an der Ruhr, DE
• Hans-Joachim Traenckner · Leverkusen, DE
• Dorde Jovcic · Leichlingen, DE

Key dates

• Filing date: Oct 25, 1994
• Grant date: Jan 14, 1997
• Expiry date: Oct 25, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/00177
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

In a process for the continuous preparation of polymers with repeating succinyl units, maleic anhydride or a derivative thereof as educt A is mixed with ammonia or an ammonia-producing compound or amides of carbonic acid as educt B and in a first reaction stage these are reacted to give an N-containing low molecular derivative of maleic acid. This derivative is then polymerized in a subsequent second reaction stage. Reaction of the educts (A,B) takes place largely adiabatically in the first reaction stage. The heat of reaction thereby released is used to take the reaction mixture to the polymerization temperature and in the second reaction stage at least partially to polymerize the N-containing low molecular derivative to obtain a polymer with repeating succinyl units.