Nova Chemicals (international) S.a.

Jeff C Stewart

Douglas W Stephan

Qinyan Wang

Stephen John Brown

John William Swabey

Daryll G Harrison

This invention is a solution process for the preparation of high molecular weight ethylene copolymers comprising contacting olefin monomers, with a catalyst system at a polymerization temperature at or above about 80&deg; C. with a catalyst system comprising an unbridged Group 4 metal compound having a monocyclopentadienyl ligand, a phosphinimine ligand and at least one uninegative, activation reactive ligand. The process can be practiced at a reaction temperature of at least 80&deg; C. to obtain high number average molecular weight polymer.

Polymerization catalyst having a phosphinimine ligand

This invention is a solution process for the preparation of high molecular weight ethylene copolymers comprising contacting olefin monomers, with a catalyst system at a polymerization temperature at or above about 80.degree. C. with a catalyst system comprising an unbridged Group 4 metal compound having a monocyclopentadienyl ligand, a phosphinimine ligand and at least one uninegative, activation reactive ligand. The process can be practiced at a reaction temperature of at least 80.degree. C. to obtain high number average molecular weight polymer.

High temperature solution polymerization process with phosphinimine

A catalyst component which is especially useful in so-called 'slurry' or 'gas phase' olefin polymerizations and which comprises an organometallic complex of a group 4 metal (having a cyclopentadienyl-type ligand and a phosphinimine ligand) and a particulate support. The catalyst component forms an excellent catalyst system when combined with an activator such as an aluminoxane or a so-called 'substantially non-coordinating anion'. In a preferred embodiment the organometallic complex and the activator are both deposited on the particulate support.

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Windsor, Canada

Jeff C Stewart