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US 2003/0119661 A1Published application
Supported phosphinimine polymerization catalyst
AssigneeNOVA Chemicals (International) S.A.
InventorsXiaoliang Gao, P. Scott Chisholm, Robert D. Donaldson, Ian McKay
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Abstract
A phosphinimine catalyst for olefin polymerization is supported on a directly fluorided metal oxide with an aluminoxane. This catalyst is highly active for olefin polymerization in comparison to prior art catalysts which use non-fluorided metal oxide supports. The directly fluorided metal oxide may be conveniently prepared by contacting the precursor metal oxide with a simple alkali metal salt (such as NaF) in an aqueous slurry.
Claims9
A supported catalyst system for olefin polymerization comprising:
- a) a directly fluorided metal oxide;
- b) an aluminoxane;
- and
- c) a group 4 metal catalyst having at least one phosphinimine ligand.
1 more element
Dependencies are inferred from the claim text.