Chevron Chemical Company LLC

Other

Chevron Phillips Chemical Company LP

Javier M Mora

John M Power

David L Beach

Albert P Masino

Woo-Kyu Kim

Klaus H Theopold

Leonard A MacAdams

Michael John Carney

Charles D Mills

James A Solis

Kevin J Taylor

Mary A Schexnayder

Catalyst compounds with &bgr;-diiminate anionic ligands and processes for polymerizing olefins

The present invention is directed to producing a resin which, when formed into a film, has excellent gas barrier and/or moisture barrier (low MVTR) properties. Further, the resin has a relatively high molecular weight distribution, preferably above 6, and has excellent processability/extrudability. The resin is produced using a cyclopentadienyl chromium compound, preferably a mono CpCr compound, on a support, preferably a silica support. A particularly preferred catalyst for use in the present invention comprises pentamethylcyclopentadienyidimethylchromiumpyridine. Preferably, the catalyst is used in a slurry polymerization process.

Process for making MVTR resin

Catalyst compounds with &bgr;-diminate anionic ligands and processes for polymerizing olefins

Disclosed is a catalyst system for the homopolymerization of alpha-olefins having 2-8 carbon atoms, said catalyst system comprising a mixed-valent dimeric Group 6b metal compound catalyst precursor wherein one atom of said Group 6b metal is a cyclopentadienyl Group 6b metal hydrocarbyl complex in which the Group 6b metal has an oxidation state +3 and wherein one atom of said Group 6b metal is a cyclopentadienyl alkaryl complex in which the Group 6b metal has an oxidation state +1, said dimeric Group 6b metal compound being supported on an inorganic support. The catalyst system can contain, in addition, a Group 2 or Group 3 metal-alkyl compound.

Cyclopentadienyl group 6b metal alpha-olefin polymerization catalysts

Growing community of inventors

Houston, TX, United States of America

Javier M Mora