Olefin polymerization catalyst system, polymerization...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 10/00 (2006.01) C08F 4/60 (2006.01) C08F 210/16 (2006.01) C08F 4/659 (2006.01)

Patent

CA 2350451

This invention relates to an olefin polymerization catalyst system comprising at least one activator and one of: a) at least two transition metal catalysts based on bidentate ligands containing pyridine or quinoline moieties, as described below as represented by formula (I), (II), (III) or (IV); b) the product of the combination of an activator and a transition metal catalyst based on bidentate ligands containing pyridine or quinolines moieties, such as those described as represented by formula (III) or (IV), that has been allowed to react prior to the introduction into the reactor, preferably for at least 15 minutes, and/or c) the product of combination of an additive and a transition metal catalyst based on bidentate ligands containing pyridine or quinoline moieties, such as those described below as represented by formula (I) or (II). This invention further relates to a polymer produced therefrom, particularly to unique polyethylene resins, more preferably bimodal high density polyethylene resins produced by this invention.

L'invention concerne un système catalytique de polymérisation d'oléfine comprenant au moins un activateur et un parmi : a) au moins deux catalyseurs à métal de transition, à base de ligands bidentés contenant des parties pyridines ou quinoléines, représentés par les formules (I), (II), (III) ou (IV) ; b) le produit de la combinaison d'un activateur et d'un catalyseur à métal de transition à base de ligands bidentés contenant des parties pyridines ou quinoléines, telles que celles représentées par la formule (III) ou (IV), ayant été mis en réaction avant d'être introduits dans le réacteur, de préférence pendant au moins 15 minutes, et/ou c) le produit de la combinaison d'un additif et d'un catalyseur à métal de transition à base de ligands bidentés contenant des parties pyridines ou quinoléines, telles que celles représentées par la formule (I) ou (II). L'invention porte également sur un polymère produit à partir dudit système, notamment sur des résines de polyéthylène spéciales, et idéalement sur des résines de polyéthylène bimodales haute densité.

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