Process for preparing elastomeric ethylene copolymers

摘要

Process for preparing elastomeric copolymers of ethylene with alpha -olefins CH2=CHR, optionally containing minor proportions of a diene, characterized by the use, during the polymerization, of a catalyst comprising the reaction product of: (I) a solid component comprising VCl3 supported on a magnesium dihalide in spherical or spheroidal shape, in active form; (II) an alkyaluminum compound; (III) optionally a halohydrocarbon. VCl3 is precipitated on said magnesium dihalide by heating VCl4 solutions in inert hydrocarbon solvents.