Method for producing monoesters and diesters of polytetrahydrofuran and of tetrahydrofuran copolymers

US7276573B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Rolf Pinkos · Bad Dürkheim, DE
• Achim Gerstlauer · Schifferstadt, DE
• Martin Haubner · Ludwigshafen am Rhein, DE
• Stephan Schlitter · Schifferstadt, DE
• Stefan Käshammer · Schifferstadt, DE
• Klaus-Peter Pfaff · Friedelsheim, DE

Key dates

• Filing date: Sep 4, 2003
• Grant date: Oct 2, 2007
• Expiry date: Oct 29, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention provides a process for preparing mono- or diesters of polytetrahydrofuran or of tetrahydrofuran copolymers by polymerizing tetrahydrofuran in the presence of at least one telogen and/or of a comonomer over an acidic catalyst, wherein the polymerization reactor is started up using a mixture of polytetrahydrofuran, the mono- or diesters of polytetrahydrofuran and/or of the THF copolymers, tetrahydrofuran, any comonomer and at least one carboxylic acid and/or one carboxylic anhydride.