Ethylene/propylene copolymer rubbers

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 4/68 (2006.01) C08F 2/34 (2006.01) C08F 210/16 (2006.01) C08F 210/18 (2006.01)

Patent

CA 2126792

-20- A process comprising contacting a mixture comprising ethylene, propylene, and, optionally, a diene, in the gas phase, under polymerization conditions, with a catalyst system comprising: (a) a catalyst precursor, in independent or prepolymer form, consisting of vanadium (acetylacetonate)3; (b) optionally, a support for said precursor; (c) a cocatalyst consisting essentially of (i) an alkylaluminum halide having the formula AlR(3-a)Xa wherein each R is independently alkyl having 1 to 14 carbon atoms; each X is independently chlorine, bromine, or iodine; and a is 1 or 2, and (ii) optionally, a trialkylaluminum provided that the molar ratio of alkylaluminum halide to trialkylaluminum is at least about 1.5:1; and (d) optionally, a promoter, which is a chlorinated ester having at least 2 chlorine atoms; a saturated or unsaturated aliphatic halocarbon having at least 3 carbon atoms and at least 6 halogen atoms; or a haloalkyl substituted aromatic hydrocarbon wherein the haloalkyl substituent has at least 3 halogen atoms.

Méthode consistant à mettre en contact un mélange d'éthylène, de propylène et, facultativement, d'une diène, en phase gazeuse et dans des conditions de polymérisation, avec un système catalytique, renfermant : a) un précurseur catalytique, sous forme indépendante ou sous forme de prépolymère, à base d'acétylacétonate de vanadium (III); b) facultativement, un support pour ce précurseur; c) un cocatalyseur constitué principalement (i) d'un halogénure d'alkylaluminium de formule AlR(3-a)Xa - où chaque R représente indépendamment un alkyle de 1 à 14 atomes de carbone, chaque X étant indépendamment du chlore, du brome ou de l'iode, et a étant 1 ou 2 - et (ii) facultativement, d'un trialkylaluminium, à la condition que le rapport molaire d'halogénure de trialkylaluminium sur le trialkylaluminium soit d'au moins 1,5; d) facultativement, un promoteur, soit un ester chloré, renfermant au moins 2 atomes de chlore, un composé aliphatique, saturé ou insaturé, renfermant au moins 3 atomes de carbone et au moins 6 atomes d'halogène, ou un dérivé de substitution haloalkylé d'un composé aromatique, le groupe haloalkyle comptant au moins 3 atomes d'halogène.

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