Patent ID: 6362292
Filing Date: 2002-03-26
Classification: C07F,C08F,Y10S

Abstract:
A transition metal complex suitable for use in the polymerization of olefins comprising a complex of formula:LxQyM-D whereinM is titanium, zirconium or hafnium in the +2 or +4 oxidation state, L is a group containing a cyclic delocalised anionic &pgr; system through which the group is bound to M, Q is a moiety bound to M via a &sgr;-bond comprising boron or a member of Group 14 of the Periodic Table and also comprising nitrogen, phosphorus, sulphur or oxygen, said moiety having up to 60 non-hydrogen atoms, x=1 or 2 y=0 or 1 such that when x=1, y=1 and when x=2, y=0, D is a neutral, conjugated or non-conjugated unsaturated moiety optionally substituted with one or more hydrocarbyl groups, said D having up to 40 carbon atoms and forming a &pgr; complex with M when M is in the +2 oxidation state and a &sgr; complex with M when M is in the +4 oxidation state and having at least one Lewis Base group B.