Process for polymerising ethylene

Details Process for polymerising ethylene Process for polymerising ethylene

C - Chemistry, Metallurgy

08

F

C08F 10/02 (2006.01) C08F 4/642 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01) C08F 110/02 (2006.01)

Patent

CA 2407367

The invention concerns a method for producing ethylene homopolymers or copolymers comprising at least 90 mol % of units derived from ethylene which consists in: contacting in polymerising conditions, the monomers with a catalytic system including: (a) a catalytic solid comprising a metallocene of a transition metal of groups 4 to 6 of the periodic table containing at least a cyclopentadiene ligand capable of being substituted, and a support, (b) at least an organoaluminium compound selected among compounds of general formula (1): AITx(Y')yX'z wherein: T is a hydrocarbon group containing 1 to 30 carbon atoms; Y' is a group selected among -OR', -SR' and NR'R'' with R' and R'' independently representing a hydrocarbon group containing 1 to 30 carbon atoms; X' is a halogen atom; x verifies the relationship 0 < x <=3; y verifies the relationship 0 <= y < 3; z verfies the relationship 0 <= z < 3, and x + y + z = 3, and (c) at least an ionic antistatic agent.

Procédé de fabrication de homo- ou de copolymères de l'éthylène comprenant au moins 90 moles% d'unités dérivées de l'éthylène dans lequel on met en contact, dans des conditions polymérisantes, les monomères avec un système catalytique comprenant (a) un solide catalytique comprenant un métallocène d'un métal de transition des groupes 4 à 6 du Tableau Périodique contenant au moins un ligand cyclopentadiénique pouvant être substitué, et un support, (b) au moins un composé organoaluminium choisi parmi les composés répondant à la formule générale (1): AlT¿x?(Y')¿y?X'¿z? dans laquelle:- T est un groupe hydrocarboné contenant de 1 à 30 atomes de carbone, - Y' est un groupe choisi parmi -OR', -SR' et NR'R" avec R' et R" représentant, de manière indépendante, un groupe hydrocarboné contenant de 1 à 30 atomes de carbone, - X' est un atome d'halogène, - x est un nombre satisfaisant à la condition 0<x<=3, - y est un nombre satisfaisant à la condition 0<=y<3, - z est un nombre satisfaisant aux conditions 0<=z<3 et x+y+z=3, et, (c) au moins un agent antistatique ionique.

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