POLYMERISATION CATALYSTS

摘要

A transition metal complex having the following Formula (A): wherein the monovalent groups R and R<2> are -R ,< >-OR, -NRR, and -NHR: the monovalent groups R, R, R, R, and R, and the divalent group R<3> are (i) aliphatic hydrocarbon, (ii) alicyclic hydrocarbon, (iii) aromatic hydrocarbon, (iv) alkyl substituted aromatic hydrocarbon (v) heterocyclic groups and (vi) heterosubstituted derivatives of said groups (i) to (v); M is a Group (3) to (11) or lanthanide metal; E is phosphorus or arsenic; X is an anionic group, L is a neutral donor group; n is (1) or (2), y and z are independently zero or integers, such that the number of X and L groups satisfy the valency and oxidation state of the metal M. n is preferably (2) and the two resulting R groups are preferably linked. The complex can be used with optional activator to polymerise olefins.