Nova Chemicals (international) S.a.

Novacor Chemicals Ltd.

Nova Chemicals Inc.

Daryll G Harrison

Xiaoliang Gao

Stephen John Brown

Linda Koch

Qinyan Wang

Rupert Edward Von Haken Spence

Douglas W Stephan

Rupert Edward Spence

Ian Douglas McKay

Wei Xu

P Scott Chisholm

Jeff C Stewart

Ian Mckay

Organometallic complexes having two phosphinimine ligands and at least one activatable ligand are catalyst components for olefin polymerization. Preferred polymerization systems are prepared by combining the organometallic complexes with an ionic activator and/or an alumoxane. Preferred catalyst components contain titanium, zirconium, or hafnium and are activated with an ionic activator to form catalysts for ethylene polymerization.

Bis-phosphinimine catalyst

A new family of metallacycles, which are preferably zirconacycles, is characterized by having a unique halogenated substituent. The metallacycles are useful for the preparation of main group heterocycles, especially two novel families of heterocycles. The first new family of heterocycles preferably contains a halosilyl substituent. A preferred group of the second family of novel heterocycles contains a silyl group having a leaving group bonded thereto. The preferred group of these heterocycles is suitable for preparing novel organometallic complexes having a bridged bidentate heterocyclic ligand. These novel organometallic complexes may be used as catalyst components in olefin polymerization. The subject catalyst components are particularly well suited for use in the medium pressure solution process to prepare linear low density polyethylene.

Olefin polymerization catalyst having a bridged phosphole-heteroatom

An olefin polymerization process uses a catalyst with an organometallic complex of a group 4 metal having a bridged cyclopentadienyl-phosphole ligand, as defined by the formula: ##STR1## wherein: each Sl is a non-interfering spectator ligand;

Olefin polymerization using a catalyst having a bridged

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.

Supported phosphinimine-Cp catalysts

A catalyst prepared by firstly depositing a large amount of aluminoxane on a particulate support, then depositing a small amount of monocyclopentadienyl zirconium trihalide on the support. The catalyst is active for the polymerization of ethylene, optionally with a minor amount of other alpha olefins such as butene or hexene, particularly in a gas phase process.

Supported monocyclopentadienyl zirconium catalyst

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Calgary, Canada

Daryll G Harrison