Bimodal pipe resin and products made therefrom

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 10/02 (2006.01) C08F 4/654 (2006.01)

Patent

CA 2657139

Disclosed is a bimodal Ziegler-Natta catalyzed polyethylene, having a density of from.930 g/cc to 0.960 g/cc, and a molecular weight distribution of from 10 to 25, wherein an article formed therefrom has a PENT of at least 1500. Also disclosed is a method of preparing a tubular article including obtaining a bimodal polyethylene having a density of from.930 g/cc to 0.960 g/cc and a molecular weight distribution of from 10 to 25, and processing the polyethylene under conditions where a specific energy input (SEI) is less than 300kW.h/ton, and wherein the article has a PENT of at least 1500. Further disclosed is a method for controlling the degradation of polyethylene including polymerizing ethylene monomer, recovering polyethylene, extruding the polyethylene, and controlling the degradation of polyethylene by measuring the SEI to the extruder and adjusting throughput and/or gear suction pressure keep SEI less than 300kW.h/ton, and forming an article.

L'invention concerne un polyéthylène bimodal catalysé selon Ziegler-Natta, ayant une densité de 0,930 g/cc à 0,960 g/cc, et une distribution de masse moléculaire de 10 à 25, un article formé à partir de ce polyéthylène ayant un PENT supérieur ou égal à 1 500. L'invention concerne également un procédé de préparation d'un article tubulaire qui consiste à obtenir un polyéthylène bimodal d'une densité de 0,930 g/cc à 0,960 g/cc et une distribution de masse moléculaire de 10 à 25, et à traiter le polyéthylène dans des conditions selon lesquelles une entrée d'énergie spécifique (SEI) est inférieure à 300 kW h/tonne, ledit article ayant un PENT supérieur ou égal à 1 500. L'invention concerne également un procédé de contrôle de la dégradation du polyéthylène qui consiste à polymériser un monomère d'éthylène, à récupérer le polyéthylène, à extruder le polyéthylène et à contrôler la dégradation du polyéthylène par la mesure de la SEI à l'extrudeuse et l'ajustement du rendement et/ou de la pression d'aspiration du matériel afin de maintenir la SEI à une valeur inférieure à 300 kW h/tonne, ainsi qu'un procédé de formation d'un article.

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