| abstract |
A catalyst system useful for the polymerization of 1-olefins containing a nitrogen-containing transition metal compound comprising a backbone unit represented by formula (B) is described:n n n [Formula B]n n n n n n n n Wherein M is Fe [II], Fe [III], Ru [II], Ru [III] or Ru [IV]; X represents an atom or group covalently or ionically bonded to transition metal M; T is the oxidation state of the transition metal M, b is the valence of the atom or group X; R 1 , R 2 , R 3 , R 4 and R 6 are independently selected from hydrogen, halogen, hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl. |