Carrier for olefin polymerization catalysts

摘要

Procedure for the preparation of a solid carrier for olefin polymerization catalysts, comprising the steps: a) impregnating a silica with a solution of Mg-chloride in the presence of electron donors, b) drying the impregnated silica obtained in (a) and impregnating it with a solution of Mg-alkyls in SiCl4 at a temperature from -10 to 20 DEG C., optionally adding a further amount of electron donors, c) subsequently treating the slurry obtained in (b) at a temperature from 40 DEG C. to reflux temperature, d) drying the carrier obtained in (c).