The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 2008
Filed:
Sep. 12, 2003
Stephan Schlitter, Limburgerhof, DE;
Martin Haubner, Eppelheim, DE;
Michael Hesse, Worms, DE;
Stefan Käshammer, Schifferstadt, DE;
Rolf Pinkos, Bad Dürkheim, DE;
Christoph Sigwart, Schriesheim, DE;
Stephan Schlitter, Limburgerhof, DE;
Martin Haubner, Eppelheim, DE;
Michael Hesse, Worms, DE;
Stefan Käshammer, Schifferstadt, DE;
Rolf Pinkos, Bad Dürkheim, DE;
Christoph Sigwart, Schriesheim, DE;
BASF SE, Ludwigshafen, DE;
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 m/g and an acid center density of at least 0.05 mmol/g for pKvalues of from 1 to 6, to a process for preparing it and to a process for the polymerization of cyclic ethers over this catalyst.