Patent ID: 7307036

Claim:
A catalyst component useful for the co-polymerization of ethylene and an alpha-olefin, wherein the catalyst component is prepared by: (i) contacting a halogen-substituted silane with an one or more compounds selected from the group of compounds consisting of alkoxysilanes, silanols, and hydropolysiloxanes; wherein the halogen-substituted silane has formula (I) R 1 X SiX Y , wherein R 1 is C 1 -C 20 hydrocarbon, X is halogen, x=0-3, and y=1-4; wherein the alkoxysilane has formula (II) R 2 m Si(OR 3 ) n , wherein R 2 and R 3 are C 1 -C 20 hydrocarbon, m=0-3, and n=1-4; where the silanol has formula (III) R 4 w Si(OH) 4-w , wherein R 4 is C 1 -C 18 hydrocarbon and w is 1, 2 or 3; and wherein the hydropolysiloxane has repeat units of formula (V) R 6 p H q SiO ((4-p-q)/2) , wherein R 6 is alkyl, aryl, aralkyl, alkoxy or aryloxy, p is 0, 1 or 2; q is 1, 2 or 3; and p+q≦3; (ii) treating the mixture of (i) with a transition metal compound having formula (IV) M(OR 5 ) a X 4-a , wherein M is titanium or vanadium; R 5 is C 1 -C 20 hydrocarbon, X is halogen, and 0<a≦4; and (iii) contacting the mixture of (ii) with a support prepared by reacting metallic magnesium with an alkyl halide or an aromatic halide and with a one or more compounds selected from the group consisting of silanols of formula (III) and hydropolysiloxanes of formula (V).