MAGNESIUM CHLORIDE PARTICLES WITH A TRUNCATED STRUCTURE, CATALYTIC COMPONENT SUPPORTED ON THESE PARTICLES, POLYOLEFINS OBTAINED BY EMPLOYING THIS CATALYTIC COMPONENT, PROCEDURES FOR MANUFACTURING THESE PRODUCTS

摘要

Porous particles of MgCl2 which have essentially the shape of two truncated right cones connected by their larger bases, which truncated cones are incurved towards the axis of symmetry perpendicular to the bases, at the intersection of the envelope of the truncated cones with two orthogonal planes passing through the said axis of symmetry. These particles are impregnated with a transition metal compound and employed as a catalytic component in the polymerization of olefins. The resultant polyolefins, especially polyethylene, polypropylene and their copolymers, are comprised of particles with a distinctive structure.