Preparation of polytetrahydrofuran or tetrahydrofuran/alkylene oxide copolymers

US5463020A · kind A · utility

Assignee

• BASF SE

Inventors

• Rainer Becker · Bad Dürkheim, DE
• Michael Huellmann · Heppenheim, DE
• Christof Palm · Ludwigshafen, DE
• Wolfgang Franzischka · Bischofswerda, DE

Key dates

• Filing date: Jun 30, 1994
• Grant date: Oct 31, 1995
• Expiry date: Jun 30, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/269
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polytetrahydrofuran or C.sub.2 -C.sub.10 -alkylene oxide/tetrahydrofuran copolymers having a molecular weight of from 250 to 20,000 Dalton are prepared by the cationic polymerization of tetrahydrofuran or tetrahydrofuran and C.sub.2 -C.sub.10 -alkylene oxides in the prsence of a promoter by a process in which the catalyst used is a mixture of one or more C.sub.2 -C.sub.6 -di- or tricarboxylic acids with boric acid.