Rare earth metal catalyst for olefin polymerization

Details Rare earth metal catalyst for olefin polymerization Rare earth metal catalyst for olefin polymerization

1995-12-28

1998-04-28

Wu, David W.

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

Catalyst or precursor therefor

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

526160, 526943, 502117, 502122, 502123, 502126, 502152, 502155, 502156, C08F 442

Patent

active

057444153

ABSTRACT:
A catalyst composition comprising: a) (i) a catalyst containing at least one cycloalkadienyl ligand substituted with at least one electron donor residue and coordinated with a metal selected from the group consisting of scandium, yttrium, and lanthanide metals; or (ii) a catalyst containing two cycloalkadienyl ligands coordinated with a metal selected from the group consisting of scandium, yttrium, and lanthanide metals, said cycloalkadienyl ligands connected by a bridging group comprising at least one Group IVA element and at least one electron donor residue; and b) an activating cocatalyst of the formula R.sub.x M', wherein R is alkyl, aryl, or hydride; M' is a Group I, II, or IIIA metal or a Group I, II, or IIIA metal complexed with oxygen, nitrogen, or a halide; and x is equal to the valence of M'.

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