| abstract |
A polymerization catalyst comprising the following Compounds (A) and (B), and if desired Compound (C):n (A) a transition metal compound containing a cyclopentadienyl group having at least one heteroatom; (B) an activating cocatalyst; and (C) an organoaluminum compound, is disclosed. n These polymerization catalysts are highly active. The use of these catalysts in the production of polyolefins, results in homopolymers or copolymers having high molecular weight and narrow comonomer distribution. Further, the control of the molecular weight and the molecular weight distribution can be made by using these catalysts. |