New carrier catalyst for the polymerization of ethylene

C - Chemistry – Metallurgy – 08 – F

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252/107, 402/643

C08F 4/643 (2006.01) C08F 4/02 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01) C08F 110/02 (2006.01)

Patent

CA 2024593

A problem in the conventional olefin polymerization catalyst systems, the procatalysts of which are based on a solid carrier and a titanium compound and an electron donor on its surface, is that unsufficiently high activities are achieved by the morphology of the carrier. Moreover, the active age of such a catalyst in the polymerization is too short. These problems have now been solved by the olefin polymerization catalyst system according to the invention, the procatalyst of which comprises a solid carrier and a layer on its surface consisting of a titanium compound, a magnesium compound and an electron donor. The advantages of the invention become more emphasized when using monocyclopentadienyl titaniumtrichloride as the titanium compound.

Les systèmes catalytiques classiques pour la polymérisation d'oléfines, dont les procatalyseurs sont constitués d'un véhicule solide, d'un composé du titane et d'un donneur d'électrons à la surface, présentent le problème suivant : la morphologie du véhicule empêche d'atteindre une activité suffisamment élevée. De plus, la période de vie active d'un catalyseur de ce type lors de la polymérisation est trop courte. Ces problèmes ont maintenant été résolus grâce au système catalytique de polymérisation des oléfines de la présente invention; le procatalyseur de ce système est constitué d'un véhicule solide et d'une couche à sa surface, à base d'un composé du titane, d'un composé du magnésium et d'un donneur d'électrons. Les avantages de l'invention deviennent plus évidents lorsqu'on utilise du trichlorure de monocyclopentadiényl-titane comme composé du titane.

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