Ziegler-natta-catalyst component, its preparation and use

Details Ziegler-natta-catalyst component, its preparation and use Ziegler-natta-catalyst component, its preparation and use

C - Chemistry, Metallurgy

08

F

252/111, 402/641

C08F 4/76 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01)

Patent

CA 2015387

Abstract The invention relates to a procatalyst composition of a catalyst system intended for the polymerization of olefins consisting of magnesium halide particles, to the surface of which has been attached a titanium compound and optionally an electron donor. Moreover, the invention relates to a method for the preparation of the procatalyst composition of this kind and its use. A draw- back in the procatalyst compositions according to the prior art is the disadvantageous morphology of the components, the small amount of the so-called active centers and the sensitivity of the titanium compounds to impurities. These problems have been over- come in the present invention by forming substantially amorphous and spherical magnesium particles, which have been activated with a titanium compound like titanium alcoxide. The magnesium partic- les are prepared by spray-crystallization of the mixture of mag- nesium halide and alcohol and optionally a donor, whereby the produced complex particles after the treatment with an organome- tallic compound are easily and efficiently activated by tita- nium alcoxide which is more durable to impurities.

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