POLYMERISATION CATALYSTS

摘要

A complex suitable for the polymerisation of 1-olefins is disclosed, having formula (A) wherein 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>, subject 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> and Z<3> are neutral, and (1) 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 hetrohydrocarbyl, 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.