CATALYST PRECURSOR AND CATALYST FOR THE POLYMERISATION OF ETHYLENE

摘要

The invention is directed to a catalyst precursor for an ethylene polymerization catalyst comprising a porous inorganic support material carrying a chromium salt and an aluminium chelate. The aluminium chelate is aluminium di( C₁-C₁₀ alkoxide) acetoacetic ester chelate for example is aluminium di (sec-butoxide) ethylacetoacetate. The chromium salt is a chromium carboxylate for example chromium (III) acetate hydroxide. The porous inorganic support material is a silica support.