Dual metallocene catalysts for polymerization of bimodal...

Details Dual metallocene catalysts for polymerization of bimodal... Dual metallocene catalysts for polymerization of bimodal...

C - Chemistry, Metallurgy

08

F

C08F 10/00 (2006.01) C07F 15/00 (2006.01) C08F 4/659 (2006.01)

Patent

CA 2641515

This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging ~5-cyclopentadienyl-type ligands, in combination with at least one second Group 4 metallocene with non-bridging ~5-cyclopentadienyl-type ligands, typically in combination with at least one cocatalyst, and at least one activator. The compositions and methods disclosed herein provide ethylene polymers with a bimodal molecular weight distribution.

La présente invention concerne des compositions de catalyseurs, des méthodes et des polymères englobant au moins un premier composé métallocène du Groupe 4 incluant des ligands pontants de type ~5-cyclopentadiényle, en combinaison avec au moins un second métallocène du Groupe 4 avec des ligands autres que pontants de type ~5-cyclopentadiényle, typiquement en combinaison avec au moins un co-catalyseur, et au moins un activateur. Les compositions et méthodes décrites dans la présente invention permettent d'obtenir des polymères d'éthylène présentant une distribution bimodale de masses moléculaires.

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