Organometallic transition metal compound used in catalyst system for preparation of polyolefins, uses biscyclopentadienyl ligand systems in its preparation

摘要

An organometallic transition metal compound is new. An organometallic transition metal compound of formula (I) is new. Independent claims are also included for: (1) a biscyclopentadienyl ligand system of Formula (II); (2) a catalyst system for the polymerization of olefins, comprising the inventive organometallic transition metal compound and co-catalyst which is able to convert the organometallic transition metal compound into a species which is polymerization-active toward olefin; (3) a process for preparing polyolefins by polymerization or copolymerization of olefin in the presence of the catalyst system; (4) use of biscyclopentadienyl ligand system for preparing an organometallic transition metal compound; and (5) a process for preparing organometallic transition metal compound comprising reacting the biscyclopentadienyl ligand system or a bis anion prepared from it with a transition metal compound. [Image].