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Zwitterionic Group VIII transition metal initiators supported by olefin ligands

United States Patent

October 25, 2011
View the Complete Patent at the US Patent & Trademark Office
A zwitterionic Group VIII transition metal complex containing the simple and relatively small 3-(arylimino)-but-1-en-2-olato ligand that catalyzes the formation of polypropylene and high molecular weight polyethylene. A novel feature of this catalyst is that the active species is stabilized by a chelated olefin adduct. The present invention also provides methods of polymerizing olefin monomers using zwitterionic catalysts, particularly polypropylene and high molecular weight polyethylene.
Bazan; Guillermo C. (Goleta, CA), Chen; Yaofeng (Shanghai, CN)
The Regents of the University of California (Oakland, CA)
11/ 519,618
September 12, 2006
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under Grant No. DE-FG03098ER14910 from the United States Department of Energy. The Government has certain rights in this invention.