Catalyst and method for producing polytetrahydrofuran

US6274700A · kind A · utility

Assignee

• BASF SE

Inventors

• Karsten Eller · Stockach, DE
• Heinz Rutter · Hochdorf-Assenheim, DE
• Michael Hesse · Westlake Village, US
• Rainer Becker · Bad Dürkheim, DE

Key dates

• Filing date: Jun 8, 2000
• Grant date: Aug 14, 2001
• Expiry date: Jun 8, 2020

Classification

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

Abstract

In a process for preparing polytetrahydrofuran, polytetrahydrofuran copolymers or diesters or monoesters thereof by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer over acid-activated montmorillonite catalysts, the montmorillonite catalyst after acid activation has a ratio of montmorillonite structure to the sum of muscovite and kaolin structures, determined from the intensities of the reflections at 2.theta.=5.5.degree. for montmorillonite, 2.theta.=9.0.degree. for muscovite and 2.theta.=12.5.degree. for kaolin measured in the X-ray powder pattern, of at least 5:1.