TITANIUM (II) OR ZIRCONIUM (II) COMPLEXES AND ADDITION POLYMERIZATION CATALYSTS THEREFROM

摘要

Novel titanium or zirconium complexes containing one and only one cyclicdelocalized, anionic, .pi.-bonded, group, said complexescorresponding to formula (I), wherein: M is titanium or zirconium in the +2formal oxidation state; L is a group containing a cyclic,delocalized, anionic, .pi.-system through which the group is bound to M, andwhich group is also bound to Z: Z is a moiety bound to M via a.sigma.-bond, comprising boron, or a ember of Group 14 of the Periodic Tableof the Elements, and also comprising nitrogen phosphorus, sulfuror oxygen, said moiety having up to 60 non-hydrogen atoms; and X is a neutral,conjugated or nonconjugated diene, optionally substitutedwith one or snore hydrocarbyl groups, said X having up to 40 carbon atoms andforming a .pi.-complex with M; are catalytically activated foruse as addition polymerization catalysts. Preferably, L is an optionallysubstituted cyclopentadienyl or fused ring cyclopentadienyl group.