Improved processing polyethylenes

B - Operations – Transporting – 29 – C

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B29C 67/24 (2006.01)

Patent

CA 2379569

Polyethylenes made from ethylene and a series of .alpha.-olefins using a catalyst that copolymerizes ethylenes and .alpha.-olefins usually have excellent melt processing characteristics, especially in uses where high zero shear viscosity and low high shear viscosity are desirable. These polyethylenes are preferably made by forming the .alpha.-olefins in situ from ethylene during the polymerization process. The polyethylenes are especially useful in blow molding, extrusion or extruded blown film processes.

L'invention concerne des polyéthylènes que l'on prépare à partir d'éthylène et d'une série d'.alpha.-oléfines, à l'aide d'un catalyseur de copolymérisation d'éthylènes et .alpha.-oléfines, et qui possèdent d'excellentes caractéristiques de traitement à l'état fondu, notamment dans des applications dans lesquelles on souhaite obtenir une viscosité élevée à cisaillement nul ou une viscosité faible à cisaillement élevé. De préférence, on prépare ces polyéthylènes en formant sur place les .alpha.-oléfines, à partir d'éthylène, lors du processus de polymérisation. Ces polyéthylène sont utiles dans des procédés de moulage par soufflage, d'extrusion ou d'extrusion soufflage de films.

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