Preparation of oxyalkylated, carboxyl-containing polymers

US4956421A · kind A · utility

Assignee

• BASF SE

Inventors

• Walter Denzinger · Speyer, DE
• Heinrich Hartmann · Schifferstadt, DE
• Richard Baur · Mutterstadt, DE
• Johannes Perner · Neustadt, DE
• Wolfgang Trieselt · Ludwigshafen, DE
• Horst Trapp · Plankstadt, DE
• Hans-Juergen Raubenheimer · Ketsch, DE

Key dates

• Filing date: Jun 19, 1989
• Grant date: Sep 11, 1990
• Expiry date: Jun 19, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F8/14
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Oxyalkylated, carboxyl-containing polymers are prepared by reacting PA1 (A) a polymer which contains one or more monoethylenically unsaturated C.sub.3 -C.sub.6 -carboxylic acids as copolymerized units with PA1 (B) an alkylene oxide in an aqueous medium at not more than 120.degree. C. by a process in which the reaction is started at a pH of from 5.0 to 5.9 and is ended after a pH of from 5.5 to 8.5 has been reached. As a result of monitoring of the pH, the selectivity of the addition reaction of alkylene oxides with the polymers (A) is substantially improved compared with known processes.