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. 25, 2025
Filed:
Mar. 16, 2020
Applicant:
Nova Chemicals (International) S.a., Fribourg, CH;
Inventors:
Charles Carter, Calgary, CA;
Janelle Smiley-Wiens, Calgary, CA;
Assignee:
NOVA Chemicals (International) S.A., Fribourg, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07F 17/00 (2006.01);
U.S. Cl.
CPC ...
C07F 17/00 (2013.01);
Abstract
A one pot synthetic method for making a bridged cyclopentadienyl/fluorenyl type ligand and the corresponding ansa metallocene polymerization catalyst. In a key step, a cyclopentadienide/fluorenide dianion is prepared by combining a fluorene compound, a fulvene compound, and at least 2 molar equivalents of KN(SiMe)in any order in the presence of an ether solvent under ambient conditions. Reaction of the cyclopentadienide/fluorenide dianion with a Group IV transition metal chloride, followed by alkylation gives a metallocene polymerization catalyst in good yields.