Ethylene copolymers

Copolymeres d'ethylene

Abstract

Polymerisation of (a) ethylene, (b) an acyclic 1-olefin containing 3 to 20 carbon atoms and (c) a cyclic olefin containing at least one endocyclic double bond, to provide a copolymer comprising 99.8 to 80 weight % of (a) units, 0.1 to 10 weight % of (b) and 0.1 to 10 weight % of (c), using as catalyst (1) transition metal compound Formula (A), and optionally (2) an activator, Z is a 5-membered heterocyclic containing at least C, at least one N and at least one of N, S or O. M is a metal from Group 3 to 11 or lanthanide. E1 and E2 are divalent hydrocarbon groups. D1 and D2 are donor atoms or groups; X is an anionic group, L is a neutral donor group; n = m = zero or 1; y and z are zero or integers such that the number of X and L groups satisfy the valency and oxidation state of the metal M. The process provides good incorporation of the cyclic comonomer.
Polymérisation de (a) éthylène, (b) 1-oléfine acyclique contenant de 3 à 20 atomes de carbone et (c) oléfine cyclique contenant au moins une double liaison endocyclique, permettant d'obtenir un copolymère qui comprend de 99,8 à 80 unités (a) en pourcentage de poids, de 0 à 10 % en poids de (b) et de 0,1 à 10 % en poids de (c) en utilisant comme catalyseur (1) un composé de métal de transition de formule (A), et éventuellement (2) un activateur, Z est un composé hétérocyclique à 5 membres contenant au moins C et au moins un N, S ou O. M est un métal du groupe 3 à 11 ou un lanthanide. E1 et E2 sont des groupes hydrocarbonés divalents. D1 et D2 sont des atomes ou des groupes donneurs; X est un groupe anionique, L est un groupe donneur neutre; n = m = zéro ou 1; y et z sont nuls ou des entiers tels que le nombre de groupes X et L satisfait la valence et l'état d'oxydation du métal M. Ce procédé assure une bonne incorporation du comonomère cyclique.

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