Transition metal/rare earth catalyst and olefin polymerization p

Details Transition metal/rare earth catalyst and olefin polymerization p Transition metal/rare earth catalyst and olefin polymerization p

1991-12-19

1993-01-26

Schofer, Joseph L.

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

Catalyst or precursor therefor

Plural component system comprising a - group i to iv metal...

502104, 502107, 502113, 502117, 502123, 502126, 526114, C08F 448

Patent

active

051822440

ABSTRACT:
A polymerization catalyst system is formed by combining an organometal compound and a transition metal compound to produce a catalyst A; and combining catalyst A and a catalyst B comprising a rare earth complex having a formula Cp.sub.n MX.sub.4-n.M'L.sub.x, wherein Cp is cyclopentadienyl or cyclopentadienyl substituted with an alkyl or alkyl silyl radical, M is yttrium, scandium or a rare earth metal having an atomic number in the range of 57 to 71, M' is an alkali metal, L is a suitable electron donor ligand, X is a halogen, n is 1 or 2, and x is a number corresponding to the value needed to form a stable complex.
Optionally catalyst A is contacted with a rare earth metal halide.
Optionally catalyst B is contacted with an alkali or alkaline earth metal alkyl.
Optionally a hydrocarbyl aluminum compound can be contacted with catalyst B or with the catalyst system.

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"Pentamethylcyclopentadienyl Derivatives of the Trivalent Lanthanide Elements Neodymium, Samarium, and Ytterbium", T. Don Tilley and Richard Anderson, Inorg. Chem. vol. 20, pp. 3267-3270, 1981.

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