Catalytic system which can be used for the stereospecific polymerisation of alpha -olefins, process for this polymerisation and polymers obtained

摘要

Catalytic system which can be used for the polymerisation of alpha -olefins comprising: a solid based on complexed titanium trichloride of delta crystalline form; an organoaluminium compound; an organic oxygenated silicon compound; characterised in that the organoaluminium compound is a non-halogenated compound.