Process for the preparation of an elastomeric polymer from...

C - Chemistry – Metallurgy – 08 – F

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C08F 210/16 (2006.01) C08F 4/64 (2006.01) C08F 10/00 (2006.01) C08F 210/18 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2189570

The invention relates to a process for the preparation of a polymer from ethylene, an .alpha.-olefin and optionally a diene, according to which these monomers are polymerised under the influence of a metallocene catalyst, the polymerisation taking place in the presence of a catalyst comprising a specific 2-indenyl metallocene, resulting in a bimodal, elastomeric polymer with a molecular weight distribution of more than 3.5, under such reaction conditions that the amount of water in the polymerisation medium is smaller than 0.5 ppm. The invention also relates to polymers with a specific branching index.

Procédé de préparation d'un polymère à partir d'éthylène, d'une alpha-oléfine et éventuellement d'un diène, selon lequel on polymérise ces monomères en présence d'un catalyseur métallocène, et on réalise cette polymérisation en présence d'un catalyseur comportant un métallocène 2-indénylique spécifique, entraînant la formation d'un polymère élastomère bimodal dans lequel la répartition des poids moléculaires est supérieure à 3,5, et ce dans des conditions de réaction telles que la quantité d'eau présente dans le milieu de polymérisation est inférieure à 0,5 ppm. On a également prévu des polymères à indice de ramification spécifique.

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