Patent ID: 7442750
Filing Date: 2008-10-28
Classification: C08F

Abstract:
1. 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 Y is —O—, —S—, —NR*—, —PR*—, M is titanium or zirconium in the +2 formal oxidation state; Z* is SiR* 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: wherein L* is a neutral Lewis base (L*—H) A 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).