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:
Oct. 02, 2007
Filed:
Sep. 04, 2003
Rolf Pinkos, Bad Dürkheim, DE;
Achim Gerstlauer, Ludwigshafen, DE;
Martin Haubner, Eppelheim, DE;
Stephan Schlitter, Limburgerhof, DE;
Stefan Käshammer, Schifferstadt, DE;
Klaus-peter Pfaff, Friedelsheim, DE;
Rolf Pinkos, Bad Dürkheim, DE;
Achim Gerstlauer, Ludwigshafen, DE;
Martin Haubner, Eppelheim, DE;
Stephan Schlitter, Limburgerhof, DE;
Stefan Käshammer, Schifferstadt, DE;
Klaus-Peter Pfaff, Friedelsheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The present invention provides a process for preparing mono- or diesters of polytetrahydrofuran or of tetrahydrofuran copolymers by polymerizing tetrahydrofuran in the presence of at least one telogen and/or of a comonomer over an acidic catalyst, wherein the polymerization reactor is started up using a mixture of polytetrahydrofuran, the mono- or diesters of polytetrahydrofuran and/or of the THF copolymers, tetrahydrofuran, any comonomer and at least one carboxylic acid and/or one carboxylic anhydride.