Olefin polymerization catalyst component and catalyst system...

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 4/649 (2006.01) C08F 4/02 (2006.01) C08F 4/64 (2006.01) C08F 4/6592 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2439892

The invention relates to a catalyst component and a catalyst system for the preparation of high molecular weight ethylene or .alpha.-olefin homopolymers, ethylene-.alpha.-olefin copolymers, terpolymers or tetrapolymers, in a polymerization process, which is expediently effected in solution, at elevated temperature, preferably at least 80 ~C. The catalyst system comprises a group 4-6 metal, preferably group 4 metal, a cyclic ligand (such as a cyclopentadienyl-type ligand), which forms a delocalized .pi.-bond with the metal M, a monohapto bonded 1,3-diaza-2-imino heterocyclic ligand (such as an iminoimidazolidine-type ligand) and anionic ligands and a catalyst activator coupound.

L'invention concerne un constituant catalytique et un système catalytique servant à préparer des homopolymères d'éthylène ou .alpha.-oléfine de poids moléculaire élevé, des copolymères d'éthylène-.alpha.-oléfine, des terpolymères ou des tétrapolymères, dans un procédé de polymérisation exécuté en solution, à température élevée, de préférence, d'au moins 80· C. Ce système catalytique comprend un métal du groupe 4-6, de préférence, un métal du groupe 4, un ligand cyclique (tel qu'un ligand de type cyclopentadiényle), constituant une liaison .PI. délocalisée avec le métal M, un ligand 1,3-diaza-2-imino hétérocyclique à liaison monohapto (tel qu'un ligand de type iminoimidazolidine) et des ligands anioniques, ainsi qu'un composé d'activation catalytique.

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