Process for the preparation of low molecular weight...

Details Process for the preparation of low molecular weight... Process for the preparation of low molecular weight...

C - Chemistry, Metallurgy

08

F

C08F 210/16 (2006.01) C08F 4/68 (2006.01) C08F 10/00 (2006.01) C08F 210/18 (2006.01)

Patent

CA 2165675

A copolymer having an RSV less than 0.6 and a process for its preparation in which ethylene, at least one other 1-alkene and optionally, an aliphatic or alicyclic polyunsaturated monomer are polymerized in the presence of a catalyst system containing (1) a compound of vanadium (2) at least one organometal compound, (3) an .alpha.-halo, ketoaromatic promoter and (4) a chain transfer agent in which the molar ratio of alkyl groups of the alkyl aluminum halide to halogen atoms is at least 1.5.

Copolymère présentant une viscosité spécifique réduite inférieure à 0,6, et son procédé de préparation consistant à polymériser l'éthylène, au moins un autre 1-alcène et éventuellement un monomère polyinsaturé aliphatique ou alicyclique, en présence d'un système catalyseur renfermant (1) un composé de vanadium, (2) au moins un composé organométallique, (3) un promoteur alpha -halo cétoaromatique, et (4) un agent de transfert de chaîne, dans lequel le rapport molaire entre les groupes alkyle de l'halogénure d'alkyle-aluminium et les atomes d'halogène est égal ou supérieur à 1,5.

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