Catalyst components for polymerization catalyst of olefins and method for the production thereof

A catalyst component for polymerization catalyst of alpha -olefines, the polymerization catalyst comprising an organoaluminum compound, an electron donor, as well as the solid catalyst component which is obtained when a compound containing magnesium reacts with a titanium halogen compound. A method for producing the catalyst component is also provided. The catalyst component is manufactured by reacting with a titanium halogen compound in the presence of an internal electron donor, a solid catalyst component which has been produced by the steps of (a) reacting a magnesium alkyl compound with a chlorinating compound, (b) dissolving the chlorinated magnesium alkyl compound in alcohol, after possible washing, (c) adding into the solution, magnesium silicate which has not been calcinated, (d) adding the mixture obtained in step (c) into a cold medium, to precipitate the magnesium compound into and onto the magnesium silicate carrier, and (e) separating the thus-obtained solid carrier component.