Patent ID: 6239059
Filing Date: 2001-05-29
Classification: C08F,Y10S

Abstract:
Catalytic system for the polymerization of olefins, comprising:(a) a metallocene catalyst, which has optionally been subjected to a prealkylation treatment;(b) a cocatalyst; and(c) an activator solid support for metallocene, said support consisting of a group of support particles for a solid catalytic component, which are formed from at least one porous mineral oxide, the particles having been modified to carry, on the surface, aluminum and/or magnesium Lewis-acid sites of formula: ##STR5##functionalization agent having reacted with --OH radicals carried by the base particles of the support, the functionalization reaction having been followed by a fluorination reaction,optionally the cocatalyst (b) being absent if the metallocene catalyst (a) has been prealkylated, optionally the support (c) having been impregnated with the metallocene catalyst (a), which catalyst has optionally been subjected to a prealkylation treatment carried out either before or after the support has been pre-impregnated.