Patent ID: 6165928
Filing Date: 2000-12-26
Classification: C08F

Abstract:
Method for the preparation of a solid catalyst component which is active in the polymerization of olefins, comprising the steps of:a) contacting a thermally treated silica support, wherein at least a part of the hydroxyl groups is eliminated by said thermal treatment, with Mg-halide or Mg-alkyl-halide or a mixture of both in a solvent, optionally in the presence of Ti-alkoxide or Ti-halide-alkoxide or a mixture of both, to form a catalyst precursor,b) contacting the catalyst precursor obtained in a) with Mg-alkyl or Mg-alkyl-halide or a mixture of both, optionally in the presence of Lewis base,or, instead of above steps a) and b),a/b) contacting a thermally treated silica support, wherein at least a part of the hydroxyl groups is eliminated by said thermal treatment, with a solution of Mg-halide or Mg-alkyl-halide or a mixture of both and Mg-alkyl, optionally in the presence of Ti-alkoxide or Ti-halogen-alkoxide or a mixture of both, and optionally in the presence of Lewis base to form a catalyst precursor,c) halogenating the catalyst precursor obtained in b) or a/b) by contact of said catalyst precursor with halogenating agent,d) titanating the product obtained in c) with Ti-tetrahalide in the presence of Lewis base,e) recovering the solid catalyst component from the reaction product of step d).