Components and catalysts for the polymerization of olefins.

摘要

Catalyst components for the polymerization of olefins are obtained by supporting on a magnesium dihalide in spherical form having particular porosity values, the product of the reaction of: a titanium compound containing at least one Ti-halogen link and/or a Ti-OR link with the solid obtained from the decomposition to magnesium dihalide or to a product containing magnesium dihalide, of a complex having the formula: MgX2.nAlR<II>X2<I>.pAlX3 wherein X is chorine or bromine, X<I> is chlorine, bromine or alkoxy group; R<II> is a hydrocarbon radical having 1-20 carbon atoms; n is an integer from 1 to 6; p is an integer from 0 to 1; (n+p) is an integer comprised between 1 and 6 inclusive.