Bp Chemicals Limited

Warren Reed

Vernon Charles Gibson

John Norman Reid Samson

Susan Katherine Christie

Polymer blends

An olefin polymerization catalyst system comprising a complex having the general formula I or II: ##STR1## wherein in formula (I) M is V, Nb or Ta and in formula (II) M is Cr, Mo or W; R is selected from alkyl and aryl, and in formula II the R groups may be the same or different; X is an organic group containing a cyclopentadienyl nucleus, Y is a univalent anionic ligand, the Y groups may be the same or different; n is 0 or 1; the complex of formula (I) or (II) being supported on a substrate comprising a polyaminostyrene or a copolymer of styrene and aminostyrene.

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Sunbury-on-Thames, United Kingdom

Warren Reed