Polymerization process
AssigneeImperial Chemical Industries PLC
InventorsDenis George Harold Ballard, Eric Jones, John Christopher Padget, Alexander Joseph Peter Pioli, Peter Anthony Robinson, John Walker, Ronald John Wyatt
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Abstract
Polymerization of ethylene using a transition metal hydrocarbyl complex, especially zirconium tetrabenzyl, supported on alumina consisting of substantially spherical particles having diameters in the range 20-150 .mu.m. The particulate polymer produced by the process contains substantially no "fines" (i.e. particles <100 .mu.m diameter) and has improved pourability.
Claims5
A process for the polymerisation of ethylene in which the ethylene is contacted with a catalyst comprising a transition metal composition which is the product of reacting a transition metal complex of general formula MR.sub.m, where M is a metal of Group IVa, chromium or vanadium, R is selected from the group consisting of alkyl, alkenyl, and substituents of the formula --CH.sub.2 Y, where Y is selected from the group consisting of aromatic groups, polyaromatic groups and groups of formula Z(R.sup.1).sub.3, where Z is silicon, germanium, tin or lead and each R.sup.1 is hydrocarbon or hydrogen and m is an integer having a value equal to the valency of metal M, with particulate alumina which is free from adsorbed water, and which consists essentially of generally spherical particles, devoid of sharp edges, and has substantially no particles with diameters less than 20 .mu..
Dependencies are inferred from the claim text.