Catalyst components for the polymerization of olefins and catalysts therefrom obtained

A process for producing a solid catalyst component for the polymerization of olefins obtained by a process comprising the steps:

• (a) reacting in an inert hydrocarbon suspension medium 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, used in amounts such that the molar ratio of metal/Mg is from 0.05 to 5, thereby obtaining a solid reaction product dispersed in a hydrocarbon slurry,
• (b) washing the solid reaction product dispersed in a hydrocarbon slurry with a liquid hydrocarbon,
• (c) contacting the washed solid reaction product obtained in (b) with a tetravalent titanium compound, wherein the product of step (b) and the tetravalent titanium compound are contacted in a molar ratio of Ti/Mg ranging from 0.001 to less than 0.1, and
• (d) contacting the product obtained in (c) with an organometallic compound of a metal of group 1, 2 or 13 of the Periodic Table to produce the solid catalyst component, wherein the organometallic compound is contacted with the product of step (c) in a molar ratio of organometallic compound to magnesium ranging from 0.1 to 1.