Patent ID: 7037872

Claim:
A metallocene catalyst of formula (III): (Cp) p M(X) m (A) n (III) in which: M is a transition metal ion or a lanthanide metal ion; p is 1 or 2; m is an integer greater than or equal to 0; n is an integer greater than or equal to 0; n+m is equal to the valency of the metal not satisfied by ligand or ligands Cp; X is a ligand which co-ordinates to M; A is a σ-ligand; and each ligand Cp which may be the same or different is a η 5 cyclopentadienyl-containing ligand characterised in that at least one of Cp is directly or indirectly substituted by a pendant siloxy group of formula wherein s is 1 to 18 and each R 5 is independently selected from the group consisting of C 1-6 alkyl groups.