Process for the preparation of catalysts for the polymerization of olefins

摘要

A catalyst for polymerisation of ethylene and other alpha-olefins comprising a combination of a metallorganic derivative of the elements belonging to groups IA, IIB and IIIB of the periodic system and a supported halide of a transition metal of group IVB and VB of the periodic system, the said supported halide being obtained by reaction of the halide with the solid product resulting from suitable deposition of metallic aluminium on an activated alumina and/or silica and/or silico-aluminate.