Components and catalysts for the polymerization of olefins.

摘要

Spherical catalyst components for the polymerization of olefins comprising a titanium compound and optionally an electron-donor supported on anhydrous magnesium chloride, characterized by a surface area between 20 and 250 m<2>/g, a porosity between 0.25 and 0.5 cc/g, and an X-ray spectrum where the magnesium chloride reflections are present at 2 theta of 35 DEG and 14.95 DEG , or where the reflection at 35 DEG is substituted by a halo with the maximum intensity between 33.5 DEG and 35 DEG and the reflection of 2 theta 14.95 DEG is absent.