METHOD FOR PREPARING DIALKYL MAGNESIUM COMPOUNDS BY ETHYLENE POLYMERISATION AND USES THEREOF

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A process for the preparation by ethylene polymerization of at least one dialkyl magnesium compound of formula R—(CH2—CH2)n—Mg—(CH2—CH2)m—R′ in which R and R′, identical or different, represent aryl, benzyl, allyl or alkyl groups and in which the integers n and m, identical or different, represent average —CH2—CH2— chain formation numbers greater than 1, the process including a single stage of mixing the following components : at least one ligand or one ligand precursor, at least one rare earth salt, at least one dialkyl magnesium compound of formula R—Mg—R′, and ethylene, in a medium allowing contact between the components of the above mixture.