Dimeric and Tetrameric Cyclopentadienyl Group 6B Metal Alpha-Olefin Polymerization Catalysts and Process for Polymerizing Alpha-Olefins

摘要

Disclosed is a catalyst system for the homopolymerization and copolymerization of alpha-olefins having 2-8 carbon atoms, said catalyst system comprising a dimeric or tetrameric cyclopentadienyl Group 6b metal compound in which the metal has an oxidation state of +2, said Group 6b metal compound being supported on an inorganic support. The catalyst system may also contain a Group 2 or Group 3 metal alkyl compound cocatalyst.