Patent ID: 7442750

Claim:
A supported catalyst system suitable for the polymerisation of olefins comprising (a) a metallocene represented by the general formula: wherein: R′ each occurrence is independently selected from hydrogen, hydrocarbyl, silyl, germyl, halo, cyano, and combinations thereof, said R′ having up to 20 nonhydrogen atoms, and optionally, two R′ groups (where R′ is not hydrogen, halo or cyano) together form a divalent derivative thereof connected to adjacent positions of the cyclopentadienyl ring to form a fused ring structure; X is a neutral η 4 bonded diene group having up to 30 non-hydrogen atoms, which forms a π-complex with M; Y is —O—, —S—, —NR*—, —PR*—, M is titanium or zirconium in the +2 formal oxidation state; Z* is SiR* 2 , CR* 2 , SiR* 2 SiR* 2 , CR* 2 CR* 2 , CR*═CR*, CR* 2 SiR* 2 , or GeR* 2 , wherein: R* each occurrence is independently hydrogen, or a member selected from hydrocarbyl, silyl, halogenated alkyl, halogenated aryl, and combinations thereof, said R* having up to 10 non-hydrogen atoms, and optionally, two R* groups from Z* (when R* is not hydrogen), or an R* group from Z* and an R* group from Y form a ring system, (b) an activator represented by the formula: (L*—H) + d (A d− ) wherein L* is a neutral Lewis base (L*—H) + d is a Bronsted acid A d− is a non-coordinating compatible anion of a Group IIIA (CAS Version) metal or metalloid having a charge of d − , and d is an integer from 1 to 3, 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 a source of a transition metal atom before the support material is contacted with (a) and with (b).