Bimetallic catalyst, method of polymerization and bimodal...

B - Operations – Transporting – 01 – J

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B01J 31/00 (2006.01) B01J 37/00 (2006.01) C08F 4/02 (2006.01) C08F 4/60 (2006.01) C08F 10/00 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01) C08F 110/02 (2006.01)

Patent

CA 2508735

Bimetallic catalysts, and methods of producing a bimetallic catalyst comprising a modified Ziegler-Natta catalyst and a metallocene are provided, in one embodiment the method including combining: (a) a Ziegler-Natta cataylst comprising a Group 4, 5 or 6 metal halide and/or oxide, optionally including a magnesium compound, with (b) a modifier compound (~modifier~), wherein the modifier compound is a Group 13 alkyl compound, to form a modified Ziegler- Natta catalyst. Also provided is a method of olefin polymerization using the bimetallic catalyst of the invention. The modified Ziegler-Natta catalyst is preferably non-activated, that is, it is unreactive towards olefin polymerization alone. In one embodiment, the molar ratio of the Group 13 metal (of the modifier) to the Group 4, 5 or 6 metal halide and/or oxide is less than 10:1 in one embodiment. The bimetallic catalyst of the present invention are useful in producing bimodal polymers, particularly bimodal polyethylene, having a Polydispersity (Mw/Mn) of from 12 to 50. These bimodal polyolefins are useful in such articles as pipes and films.

L'invention porte sur des catalyseurs bimétalliques, et sur leur procédé d'obtention utilisant un catalyseur de Ziegler-Natta modifié et un métallocène. Dans une exécution le procédé consiste à combiner: (a) un catalyseur de Ziegler-Natta comprenant un halogénure de métal du groupe 4, 5 ou 6 incluant facultativement un composé de magnésium, et (b) un composé modificateur consistant en composé alkylique du groupe 13, pour former le catalyseur de Ziegler-Natta modifié qui est de préférence non activé c.-à-d. non réactif vis-à-vis de la polymérisation des oléfines lorsqu'utilisé seul. Dans une exécution le rapport molaire du métal du groupe 13 modificateur à l'halogénure de métal du groupe 4, 5 ou 6 est de moins de 10:1. Lesdits catalyseurs bimétalliques peuvent servir à produire des polymères bimodaux, et en particulier des polyéthylènes bimodaux présentant une polydispersité (Mw/Mn) de 12 à 50 utilisables pour des articles tels que des pipes ou des films.

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