Pre-polymerized catalyst components for the polymerization...

C - Chemistry – Metallurgy – 08 – F

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C08F 4/64 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2305692

Components of catalysts for the polymerization of olefins are ob tained by contacting a Ti compound of formula Ti(OR)n-yXy, where n is the valence of titanium and y is a number between 1 and n, with a pre-polymer having a porosity higher than 0.3 cc/g and containing from 0.5 to 100 g of polymer per g of solid catalyst component, the pre-polymer being obtained by (co)polymerizing an olefin or a diolefin in the presence of a catalyst comprising a Ti, V, Zr of Hf compound supported on an Mg dihalide having a mean crystallite dimension lower than 30 nm.

L'invention porte sur des composants prépolymérisés de catalyseurs pour la polymérisation d'oléfines obtenus par mise en contact d'un composé de formule Ti(OR)¿n-y?X¿y?, où n est la valence du titane, et y un nombre compris entre 1 et n, avec un prépolymère présentant une porosité supérieure à 0,3 cc/g et contenant entre 0,5 et 100 g de polymère par g de composant de catalyseur solide. Le prépolymère s'obtient par (co)polymérisation d'une oléfine ou d'une dioléfine en présence d'un catalyseur consistant en un composé de Ti, V, Zr ou Hf sur support de dihalogénure de Mg dont la taille moyenne des cristallites est inférieure à 30 nm.

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