Patent ID: 7247594

Claim:
A catalyst composition comprising: a) a transition metal compound with the following formula: wherein: M is titanium, zirconium, or hafnium; R n is an alkyl, aryl, alkaryl or arylaryl group containing 1-20 carbon atoms; n is 0 or 1; X is independently a group 15 or group 16 element; E is a divalent bridging group containing up to 40 atoms, not counting hydrogen, which links X and Y; Y is independently a group 15 or group 16 element; a is 1, 2, 3, or 4; Z is a monovalent anionic group; Z′ is a monovalent anionic group; b is 0, 1 or 2, and c is 0, 1 or 2; L is a neutral donor ligand; d is 0, 1 or 2; and b) a chemically-treated solid oxide treated with an electron-withdrawing anion wherein the electron-withdrawing anion is selected from chloride, bromide, phosphate, triflate, bisulfate, sulfate, or any combination thereof.