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Abstract

A catalyst component for the polymerization of olefins obtainable by:

(a) reacting a Mg(OR1)(OR2) compound, in which R1 and R2 are identical or different and are each an alkyl radical having 1 to 10 carbon atoms, with a tetravalent transition metal compound having at least a metal-halogen bond, the molar ratio metal/Mg ranging from 0.05 to 10, thereby obtaining a solid reaction product, and(b) contacting the solid reaction product obtained in step (a) with a silicon compound of formula RISi(ORII)3 where RI is a linear, branched, cyclic or aromatic C1-C20 hydrocarbon group and RII is a linear, branched, cyclic or aromatic C2-C20 hydrocarbon group, the molar ratio of the silicon compound on the transition metal in the solid reaction product of step (a) ranging from 0.1 to 3.

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First Claim