Naphtachimie

Michel Avaro

Pierre M Mangin

A method for the polymerization of olefins using a catalyst in the form of a solid compound of a transition metal in which the transition metal is at least partially reduced to a valency state lower than the maximum valency state, with the transition metal compound being subjected prior to use to pre-activation by contact with magnesium and one or more halogenated hydrocarbons and one or more organo-metallic compounds of Groups II and III.

Polymerization of olefins with pre-activated catalysts

The method of polymerizing olefins which includes the preparation of a pre-activated compound of a transition metal of IVa, Va and VIa of the periodic table of elements, in which the transition metal is at least partially in a reduced valency state, in which the pre-activation is carried out by contacting the transition metal compound with an organomagnesium compound and then polymerizing the olefins in the presence of the pre-activated transition metal compound and an organo-aluminum compound.

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Martigues, France

Michel Avaro