Process for the preparation of polymers having recurring agents

US6054553A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Torsten Groth · Reinbek, DE
• Winfried Joentgen · Neunburg vorm Wald, DE
• Frank Dobert · Earlton, US
• Klaus-Peter Heise · Bensberg, DE
• Thomas Menzel · Hilten, DE
• Ursula Pentling · Duisburg, DE
• Hans-Georg Pirkl · Leverkusen, DE
• Paul Wagner · Mülheim an der Ruhr, DE
• Joergen Weinschenck · Krefeld, DE

Key dates

• Filing date: Nov 12, 1996
• Grant date: Apr 25, 2000
• Expiry date: Nov 12, 2016

Classification

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

Abstract

Polymers having recurring succinyl units are obtained by an improved process by reaction of A, an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof, with B, a nitrogen-donating compound, in a first reaction step to give a reaction mixture comprising at least one low molecular weight reaction product, and subsequent continuous feeding of the reaction mixture into a continuously operated reactor to give the polymer in a second reaction step. In a further embodiment the invention refers to polymers having recurring succinyl units prepared by reaction of an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof with a nitrogen-donating compound in a first reaction step and subsequent feeding of the reaction mixture, without intermediate isolation, into an optionally continuously operated reactor, with removal of water, and treatment of the reaction mixture at a temperature of 140 to 350.degree. C.