Catalyst containing an aromatic silicon compound for the polymerization of ethylene
AssigneeSociete Chimique des Charbonnages S.A.
InventorsKarel Bujadoux, Jean-Marie Neyer
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Abstract
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.
Claims12
A catalyst for the polymerization or copolymerization of ethylene comprising at least one halogenated compound of a transition metal of Groups IV to VI of the Periodic System, said metal being in the trivalent state in said compound, and at least one aromatic silicon compound having the formula .phi..sub.n Si(OH).sub.4-n, in which .phi. is an aromatic or polyaromatic ring compound having from 6 to 15 carbon atoms and 1.ltoreq.n.ltoreq.3, said aromatic silicon compound being present in a molar ratio of between 0.2 and 2 inclusive with respect to said transition metal, wherein said aromatic or polyaromatic ring compound may have one or more hydrocarbon radicals substituted on the aromatic or polyaromatic rings of said compound.
Dependencies are inferred from the claim text.