Olefin polymerization catalyst system

C - Chemistry – Metallurgy – 08 – F

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C08F 10/00 (2006.01) C08F 4/02 (2006.01) C08F 4/658 (2006.01)

Patent

CA 2621039

A catalyst system useful for polymerizing olefins is disclosed. The catalyst system comprises a cocatalyst and a supported transition metal prepared from a halogen-containing Group 4-6 transition metal compound and an organoaluminum- siloxane containing mixture. The latter mixture, which is prepared from an organoaluminum compound and an organomagnesium-siloxane reaction product, incorporates a chelating ligand. The invention includes a method for making the catalyst system and a process for polymerizing olefins using the catalyst system. The process is convenient and avoids expensive catalyst components used in known olefin polymerization processes.

La présente invention concerne un système de catalyseur utile pour la polymérisation d~oléfines. Le système de catalyseur comprend un co-catalyseur et un métal de transition supporté préparé à partir d'un composé halogéné à base de métal de transition des Groupes 4 à 6 et d~un mélange contenant un organoaluminium et un siloxane. Ce dernier mélange, qui est préparé à partir d~un composé organoaluminium et d~un produit de la réaction entre un organomagnésien et un siloxane, incorpore un ligand de chélation. L'invention comprend un procédé de fabrication du système de catalyseur et un procédé de polymérisation d~oléfines utilisant le système de catalyseur. Le procédé est pratique et évite l~utilisation de composants de catalyseur coûteux utilisés dans les procédés connus de polymérisation d'oléfines.

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