Mixed phosphinimine catalyst
AssigneeNOVA Chemicals (International) S.A.
InventorsIan McKay, Alison Ciupa, Barbara Christine Hall
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Abstract
A supported catalyst for the polymerization of olefins, especially ethylene, has at least two catalyst components having different propagation and/or termination constants. Each catalyst component must have at least one phosphinimine ligand. The polymer produced according to this invention has a broad molecular weight distribution. Catalysts according to this invention have a very surprising and desirable hydrogen response.
Claims10
A process for the (co)polymerization of ethylene to elastomeric polyethylene having a broad molecular weight distribution comprising polymerizing ethylene in the presence of a catalyst system comprising:
- a) at least two different mono or di-phosphinimine catalysts;
- b) at least one cocatalyst;
- and
- c) a particulate support.
Dependencies are inferred from the claim text.