Patent ID: 7291575

Claim:
A catalyst composition useful in the polymerization of olefins formed by contacting substantially simultaneously in a single reaction zone and in an inert liquid, the components comprising: a) aluminum compounds selected from at least one aluminum compound represented by the formula Al(R) a (Q) b (D) c wherein R is a hydrocarbyl group; Q is a hydrocarbyloxy group; D is hydrogen or halogen; and each a, b, c is an integer of 0-3 provided the sum of a+b+c is 3; b) an inorganic oxide having from 0.01 to 12 mmole/gram of surface hydroxyl groups; and c) a precatalyst selected from at least one transition metal compound selected from the group consisting of a bidentate ligand/transition metal complex, a tridentate ligand/transition metal complex and mixtures thereof and wherein the transition metal of said complex is Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt, Ti, Zr or Hf; said components being present in amounts to provide 0.001 to 2.1 mmol of aluminum and from 1 to 1000 μmol of transition metal per gram of inorganic oxide and a mole ratio of aluminum of component a) to transition metal of component c) of from 1:1 to 25:1.