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:
Mar. 27, 2007
Filed:
Apr. 20, 2005
Robert P. Dion, Midland, MI (US);
Brian A. Jazdzewski, Charleston, WV (US);
Francis J. Timmers, Midland, MI (US);
Keith J. Watson, Midland, MI (US);
Paul C. Vosejpka, Homer Township, MI (US);
Robert P. Dion, Midland, MI (US);
Brian A. Jazdzewski, Charleston, WV (US);
Francis J. Timmers, Midland, MI (US);
Keith J. Watson, Midland, MI (US);
Paul C. Vosejpka, Homer Township, MI (US);
Dow Global Technologies Inc, Midland, MI (US);
Abstract
Cyclic oligomers containing ester linkages are polymerized in the presence of a catalyst having at least one oxygen atom bonded to two metal atoms. At least one of the metal atoms is a tin atom, which is preferably tetravalent, i.e., bonded to three other groups in addition to the oxygen atom. The other metal atom may also be another tin atom, which is again preferably tetravalent, or a zinc, aluminum or titanium atom. The catalyst may contain multiple oxygen atoms that are bonded to two such metal atoms as described. These catalysts are active, efficient polymerization catalysts. They are often liquids at polymerization temperatures. The catalysts can be formed in situ in the polymerization process, which provides additional flexibility in the process and increased storage stability of starting materials.