Patent ID: 7022781

Claim:
A polymerization process comprising contacting at least one mono-1-olefin under polymerization reaction conditions with a catalyst composition to produce a polymer, the catalyst composition comprising: 1) the product resulting from the combination of: a) a chromium catalyst having a pore volume of at least 1.8 cc/g and a surface area of at least 400 m 2 /g produced by contacting a chromium-containing, titanium-containing, silica-containing solid with carbon monoxide under conditions such that a substantial portion of the chromium is in the divalent state after contacting with carbon monoxide; and b) a cocatalyst, wherein the cocatalyst is an alkyl lithium or aryl lithium compound; and 2) a Ziegler-Natta catalyst composition produced by combining a halide of titanium, vanadium, or zirconium and an organoaluminum compound.