Patent ID: 7273912

Claim:
A supported catalyst system suitable for the polymerisation of olefins comprising (a) metallocene having the formula: CpMX n wherein Cp is a single cyclopentadienyl or substituted cyclopentadienyl group optionally covalently bonded to M through a substituent, M is a Group VIA metal bound in a η 5 bonding mode to the cyclopentadienyl or substituted cyclopentadienyl group, X each occurrence is hydride or a moiety selected from the group consisting of halo, alkyl, aryl, aryloxy, alkoxy, alkoxyalkyl, amidoalkyl, and siloxyalkyl having up to 20 non-hydrogen atoms or neutral Lewis base ligands having up to 20 non-hydrogen atoms or optionally one X together with Cp forms a metallocycle with M and n is dependent upon the valency of the metal, (b) a non-aluminoxane activator, and (c) a support material comprising an inorganic metal oxide, inorganic metal halide or polymeric material or mixtures thereof, wherein the support material has been pretreated with an SO 4 containing compound.