Patent ID: 7598328

Claim:
A supported, heterogeneous catalyst composition for use in polymerization of addition polymerizable monomers, comprising: 1) a substrate comprising the reaction product of a solid, particulated, high surface area, metal oxide, metalloid oxide, or a mixture thereof having a surface area as determined by the B.E.T. method of from 10 m 2 /g to 1000 m 2 /g and an organoaluminum compound, 2) a hafnium complex of a polyvalent, Lewis base ligand; and optionally, 3) an activating cocatalyst for the hafnium complex wherein the hafnium complex corresponds to the formula: X is an anionic, neutral or dianionic ligand group; R b independently each occurrence is hydrogen, halogen, C 1-20 alkyl, or C 6-20 aryl, or two adjacent R b groups are joined together thereby forming a ring, and b is 1-5; and R C independently each occurrence is hydrogen, halogen, C 1-20 alkyl, or C 6-20 aryl, or two adjacent R C groups are joined together thereby forming a ring, and c is 1-5.