Patent · US Expired

Catalyst, its preparation and the polymerization of cyclic ethers over this catalyst

US7449422B2 · kind B2 · utility

0Cited by

11References

4Claims

0Family size

Assignee

BASF SE

Inventors

Stephan Schlitter · Schifferstadt, DE
Martin Haubner · Ludwigshafen am Rhein, DE
Michael Hesse · Westlake Village, US
Stefan Käshammer · Schifferstadt, DE
Rolf Pinkos · Bad Dürkheim, DE
Christoph Sigwart · Schriesheim, DE

Key dates

Filing date	Sep 12, 2003
Grant date	Nov 11, 2008
Priority date	—
Expiry date	Feb 4, 2025

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J35/66
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The present invention relates to a solid, acid catalyst for the preparation of polytetrahydrofuran, polytetrahydrofuran copolymers, diesters or monoesters of these polymers by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer, which has a BET surface area of at least 160 m2/g and an acid center density of at least 0.05 mmol/g for pKa values of from 1 to 6, to a process for preparing it and to a process for the polymerization of cyclic ethers over this catalyst.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.