Process using a rare earth metal catalyst for olefin polymerizat

Details Process using a rare earth metal catalyst for olefin polymerizat Process using a rare earth metal catalyst for olefin polymerizat

1998-01-26

1999-11-02

Wu, David W.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526164, 526901, 526943, 5263485, 502121, 502155, C08F 442

Patent

active

059772700

ABSTRACT:
There is provided a polymerization process for the production of olefin polymers using 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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