Patent ID: 7842638

Claim:
A polymerisation catalyst comprising (1) a transition metal compound having the following Formula A, and optionally (2) an activating quantity of a suitable activator, wherein Z comprises a five-membered heterocyclic group, the five-membered heterocyclic group containing at least one carbon atom, at least one nitrogen atom and at least one other hetero atom selected from nitrogen, sulphur and oxygen, the remaining atoms in said ring being selected from nitrogen and carbon; M is a metal from Group 3 to 7 of the Periodic Table or a lanthanide metal; E 1 and E 2 are divalent groups independently selected from (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); D 1 and D 2 are donor atoms or groups; X is an anionic group, L is a neutral donor group; n=m=zero or 1; 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, wherein the complex contains at least one polymerisable olefinic double bond which is present in, or substituent to, at least one of the atoms, groups or ligands represented by Z, E and D, with the proviso that when Z is an imidazole-containing group selected from then none of the groups R 1 to R 11 is ethylenyl, and further with the proviso that the ligand in Formula A represented by —Z-E 1 -D 1 -(E 2 ) n -(D 2 ) m -is not a ligand containing the skeletal heterocyclic unit wherein R 16 and R 17 are each independently hydrocarbyl or substituted hydrocarbyl, R 18 and R 19 are each independently hydrogen, hydrocarbyl or substituted hydrocarbyl and wherein R 18 and R 19 can be taken together to form a ring.