Zwitterionic Group VIII transition metal initiators...

Details Zwitterionic Group VIII transition metal initiators... Zwitterionic Group VIII transition metal initiators...

2006-09-12

2011-10-25

Lu, Caixia (Department: 1765)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

C556S007000, C556S032000, C526S134000, C526S160000, C526S164000, C526S171000, C526S172000, C502S152000, C502S155000

Reexamination Certificate

active

08044225

ABSTRACT:
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.

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