| abstract |
A complex suitable for the polymerization of l-olefins is disclosed, having the Formula Awherein M is a transition metal, lanthanide or actinide; X represents an atom or group covalently or ionically bonded to the transition metal M; b is the valency of the atom or group X; Z<1 >is N or P; Z<2 >is N, P, N<->, P<->or NR<5>; Z<3 >is one of N, P, O, S, NHR<3>, NR<3>R<4>, OH, OR<3>, SH, SR<3>, PHR<3>, PR<3>R<4>, (NR<3>)<->, O<->, S<->, (PR<3>)<->, P(R<3>R<4>)O, NR<3 >or PR<3 >to the proviso that one of Z<2 >and Z<3 >is anionic; T is the oxidation state of the transition metal M when both Z<2 >or Z<3 >are neutral, and is one less than the oxidation state of M when one of Z<2 >or Z<3 >is anionic; A and B are independently hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl, and may together with Z<2 >form part of a heterocyclic substituent; B may be joined to Z<3 >by either a single or a double bond; R<1 >to R<5 >are each independently selected from hydrogen, halogen, hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl or substituted heterohydrocarbyl, and any two or more of R<1 >to R<5 >when hydrocarbyl may be joined together to form a ring; L is a solvate molecule, and n is from 0 to 5. The complex is useful as a polymerization catalyst in a process for the polymerization and copolymerization of olefins. |