Process for preparing group 6 metal-based olefin polymerization

Details Process for preparing group 6 metal-based olefin polymerization Process for preparing group 6 metal-based olefin polymerization

1997-10-20

1999-08-24

Bell, Mark L.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

502152, 502154, 502156, 556 58, 556 63, B01J 3100, C07F 1100

Patent

active

059424621

ABSTRACT:
A Group 6 metal-containing, ligand-containing olefin polymerization catalyst component can be made by using an unsolvated Group 6 metal trihalide as the starting reagent for the Group 6 metal which comprises contacting (e.g., in tetrahydrofuran) the Group VIB metal trihalide, such as chromium trichloride, with a ligand reagent or reagents, such as a cyclopentadienyl-containing lithium compound and a lower alkyl-containing lithium compound, in the presence of a sigma donor ligand, such as pyridine.

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Derwent Patent Abstract 50514S-AE (1971).
J.C. Fettinger et al., "Accessibility of 17-Electron Structures for Cyclopentadienylchromium(III) Compounds. 1. Experimental Studies on the Dichloride and Dimethyl Compounds", Organometallics 1996, 15, 4211-4222.
K.H. Theopold, "Organochromium(III) Chemistry: A Neglected Oxidation State", Acc. Chem. Res. 1990, 23, 263-270.
Y. Liang, et al. "Constrained Geometry Chromium Catalysts for Olefin Polymerization", Organometallics 1996, 15, 5284-5286. Chromium(III) Alkyl with Bridging Methyl Groups and a Cr--Cr Bond", J. Am. Chem. Soc. 1989, 111, 9127-9129.

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