Patent ID: 6468938
Filing Date: 2002-10-22
Classification: C08F

Abstract:
A prepolymerized catalyst component for the polymerization of olefins CH2&boxH;CHR comprising a solid catalyst component obtained by reacting TiCl4 with an adduct of formula MgCl2.pRâ€²OH and an internal electron donor compound selected from 1,3-diethers of formula (I): being prepolymerized with ethylene to such an extent that the amount of the ethylene prepolymer is up to 100 g per g of solid catalyst component;wherein said solid catalyst component is capable of yielding in the standard propylene polymerization test a propylene homopolymer having an insolubility in xylene at 25Â° C. higher than 90%, wherein R is hydrogen or a C1-C12 alkyl group, wherein p is a number between 0.1 and 6 and Râ€² is a hydrocarbon radical having 1-18 carbon atoms, and wherein RI, RII, RIII, RIV, RV, and RVI equal or different to each other, are hydrogen or hydrocarbon radicals having from 1 to 18 carbon atoms, and RVII and RVIII, equal or different from each other, have the same meaning of RI-RVI except that they cannot be hydrogen; one or more of the RI-RVIII groups can be linked to form a cycle.