Catalysts and processes for the polymerization of olefins

Details Catalysts and processes for the polymerization of olefins Catalysts and processes for the polymerization of olefins

C - Chemistry, Metallurgy

08

F

C08F 10/02 (2006.01) C07F 5/06 (2006.01) C08F 10/00 (2006.01) C08F 10/06 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2276173

Catalysts for the polymerization of olefins are disclosed, which comprise the product obtained by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of titanium, zirconium or hafnium; (B) an organometallic aluminium compound of the formula: Al(CH2-CR4R5-CR6R7R8)wR9qHz wherein R4 is a C1-C10 alkyl, alkenyl or arylalkyl group; R5 is hydrogen or a C1-C10 alkyl, alkenyl or arylalkyl group; R6 and R7 are C1-C10 alkyl, alkenyl, aryl, arylalkyl or alkylaryl groups; R8 is hydrogen or a C1-C10 alkyl, alkenyl, aryl, arylalkyl or alkylaryl group; R9 is a C1-C10 alkyl, alkenyl or arylalkyl group, a carbon atom in the compound of formula (II) being optionally replaced by a Si or Ge atom; w is 1-3, z is 0 or 1, q=3-w-z, and (C) water; the molar ratio (B)/(C) being comprised between 1:1 and 100:1. These catalysts show an improved activity with respect to known catalysts, wherein different aluminium compounds are used.

L'invention concerne des catalyseurs de polymérisation d'oléfines. On obtient ces catalyseurs en mettant en contact: (A) un composé cyclopentadiényle ponté et/ou substitué de titane, zirconium ou hafnium; (B) un composé d'aluminium organométallique de formule Al(CH¿2?-CR?4¿R?5¿-CR?6¿R?7¿R?8¿)¿w?R?9¿¿q?H¿z?, dans laquelle R?4¿ est un groupe alkyle, alcényle ou arylalkyle en C¿1?-C¿10?; R?5¿ est l'hydrogène ou un groupe alkyle, alcényle ou arylalkyle en C¿1?-C¿10?; R?6¿ and R?7¿ sont des groupes alkyle, alcényle, aryle, arylalkyle ou arylaryle C¿1?-C¿10?; R8 est l'hydrogène ou un groupe alkyle, alcényle, aryle, arylalkyle ou alkylaryle en C¿1?-C¿10?; R?9¿ est un groupe alkyle, alcényle ou arylalkyle en C¿1?-C¿10?, un des atomes de carbone du composé de la formule (II) étant éventuellement remplacé par un atome de Si ou Ge; w est 1-3, z est 0 ou 1, q=3-w-z; et (C) de l'eau. Le rapport molaire (B)/(C) est compris entre 1:1 et 100:1. Ces catalyseurs font preuve d'une activité améliorée comparés aux catalyseurs connus pour lesquels différents composés d'aluminium sont utilisés.

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