Polymerisation catalysts

摘要

A transition metal complex having the following Formula (A): wherein the monovalent groups R¹ and R² are -R^a, -OR^b, -NR^cR^d, and -NHR^e: the monovalent groups R^a, R^b, R^c, R^d and R^e, and the divalent group R³ 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 R¹ groups are preferably linked. The complex can be used with optional activator to polymerise olefins.