Process for the polymerization of alpha-olefins or of their mixtures with minor amounts of ethylene, by means of catalysts comprising solid components or precursors of such components, in the form of microspheroidal particles

摘要

Polymers of alpha-olefins of formula:R-CH=CH₂wherein:R = alkyl having from 1 to 6 C atoms,or of their mixtures with minor amounts of ethylene are obtained by adopting catalysts comprising:(A) a solid component obtained by treating(a) an emulsion in a perfluoropolyether liquid of a liquid compound of magnesium, of titanium or of another transition metal, either liquid or in solution, with possibly using an electron-donor compound, with(b) a reducing and/or halogenating agent capable of forming an insoluble solid product, after which, if such a product is a precursor of the catalytic component, it is treated with a tetravalent-titanium halide, or with a halide of another transition metal;(B) an aluminum-alkyl compound;(C) an outer electron-donor compound (c).