Societe Chimique Des Charbonnages-cdf Chimie

Societe Chimique Des Charbonnages S.a.

Jean-Marie Neyer

Karel Bujadoux

Jean-Pierre Houzeaux

Jean-Pierre Machon

A catalyst system for use in the polymerization of ethylene under high pressure and temperature containing an alkyl-aluminum or alkylsiloxalane activator and a compound of the formula:

Catalyst system for the polymerization of ethylene

A catalyst for the polymerization of ethylene comprising at least one halogenated compound of a transition metal of Groups IV to VI of the Periodic System and at least one aromatic silicon compound having the formula .phi..sub.n Si(OH).sub.4-n, in which .phi. is a substituted or unsubstituted aromatic or polyaromatic ring compound having from 6 to 15 carbon atoms and 1.ltoreq.n.ltoreq.3, said silicon compound being present in a molar ratio of between 0.2 and 2 inclusive with respect to said transition metal. Polymerization of ethylene may be carried out under a pressure of between 200 to 2500 bars and at a temperature of between 170.degree. and 300.degree. C. with the catalyst of this invention.

Catalyst containing an aromatic silicon compound for the polymerization

An organometallic halide having the formula:

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Bethune, France

Jean-Marie Neyer