Method for the production of tetrahydrofuran copolymers

US7586011B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Martin Haubner · Ludwigshafen am Rhein, DE
• Rolf Pinkos · Bad Dürkheim, DE

Key dates

• Filing date: Dec 16, 2003
• Grant date: Sep 8, 2009
• Expiry date: Aug 2, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2666
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention provides a process for preparing polyoxyalkylene glycols of a certain molecular weight in one stage by copolymerizing tetrahydrofuran and alpha,omega-diols as the comonomer in the presence of a heteropolyacid and of a hydrocarbon, by distilling off a mixture of water and this hydrocarbon from the copolymerization, which comprises terminating the polymerization when this molecular weight is attained by adding water, comonomer, butanediol or butanediol-water mixtures.