GROUP 4 TRANSITION METAL COMPLEX WITH A MONOANIONIC LIGAND AND OLEFIN POLYMERIZATION CATALYST COMPRISING THE SAME

摘要

Catalysts useful for polymerizing olefins are disclosed. The catalysts comprise an activator and a Group 4 transition metal complex which comprises at least one monoanionic R¹N-XR² ligand, where X is O or S, and each of R¹ and R² is independently alkyl, aryl, arylalkyl, alkylaryl, or trialkylsilyl. The complexes are readily made from R¹NH-XR² precursors and are often useful as catalyst components without further purification. The catalysts have good activities, incorporate comonomers well, and provide polymers with high molecular weight.