Spherical components and catalysts for the polymerization of olefins.

摘要

Spherical components of catalysts for the polymerization of olefins comprising: (a) a vanadium compound selected from the compounds of formula VOX2Y or VXnYn-4n, where X is Cl or Br and Y is Cl, Br, OR or NR<I>2 (b) MgCl2 in spherical form. Said components have an average diameter greater than 1 mu m, a surface area of at least 10 m<2>/g, a porosity of at least 0.1 g/cm<3> and an X-ray spectrum having particular characteristics.