Branched, quaternary polyoxyalkylene copolyesters, a process for their preparation, and their use

US4885111A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Wllibald Bose · Altötting, DE
• Manfred Hofinger · Altötting, DE
• Martin Hille · Liederbach, DE
• Roland Bohm · Altenberge, DE
• Friedrich Staiss · Wiesbaden, DE

Key dates

• Filing date: Nov 12, 1987
• Grant date: Dec 5, 1989
• Expiry date: Nov 12, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23F11/173
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Branched, quaternary polyoxyalkylene copolyesters are described which are prepared by esterifying an oxyalkylated primary fatty amine and an at least trihydric oxyalkylated alkanol or an oxyalkylated polyamine using a dicarboxylic acid or a dicarboxylic anhydride with polycondensation, and quaternizing the esterification product obtained using ethylene oxide or propylene oxide in the presence of a mineral acid or carboxylic acid. The novel, branched, quaternary polyoxyalkylene copolyesters are used as demulsifiers and corrosion inhibitors in the processing of crude oil emulsions.