Method for producing polytetrahydrofuran

US7074944B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ulrich Steinbrenner · Kohlhof, DE
• Martin Haubner · Ludwigshafen am Rhein, DE
• Achim Gerstlauer · Schifferstadt, DE
• Thomas Domschke · Speyer, DE
• Christoph Sigwart · Schriesheim, DE
• Stefan Käshammer · Schifferstadt, DE

Key dates

• Filing date: Jul 26, 2002
• Grant date: Jul 11, 2006
• Expiry date: Jun 24, 2023

Classification

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

Abstract

In a process for the single-stage preparation of polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 650 to 5000 dalton by polymerization of tetrahydrofuran over an acid catalyst in the presence of at least one telogen and/or comonomer, the telogen and/or comonomer is added at at least two addition points in different segments of the polymerization apparatus.