Patent ID: 6992034

Claim:
A catalyst component useful for the co-polymerization of ethylene and an alpha-olefin, wherein the catalyst component is prepared by: (i) providing a magnesium halide composite support by treating metallic magnesium with an alkyl halide or aromatic halide, a transition metal compound having the structural formula M(OR) a X 4-a , at least one electron donating compound containing at least one ether group, and at least one organo-silicon compound having at least one silicon-oxygen bond; wherein M is selected from the group consisting of Ti, Zr, Hf, V, and Cr; R is a C 1-20 hydrocarbon, X is halogen, and a is 1 to 4; (ii) treating the magnesium halide composite support with a halogenized transition metal compound and a chelating diamine compound in the presence of an organo-magnesium compound and one or more compounds selected from the group consisting of halogenized silicon compounds and halogenized boron compounds.