High molecular weight, medium density polyethylene

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 210/16 (2006.01) C08F 2/00 (2006.01) C08F 8/50 (2006.01) C08F 255/00 (2006.01) C08F 297/08 (2006.01) C08L 23/08 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2417215

A high molecular weight, medium density polyethylene (HMW, MDPE) is disclosed. The polyethylene comprises from about 85 to about 98 wt % of recurring units of ethylene and about 2 to about 15 wt % of a C3-C10 .alpha.-olefin. It has a density from about 0.92 to about 0.944 g/cc, a melt index MI2 from about 0.01 to about 0.5 dg/min, and a melt flow ratio MFR from about 50 to about 300. It has a multimodal molecular weight distribution comprising a high molecular weight component and a low molecular weight component. The low molecular weight component has an MI2 from about 50 to about 600 dg/min and a density from about 0.94 to about 0.97 g/cc. A process for making the medium density polyethylene is also disclosed. The process uses a Ziegler catalyst and applies multiple reaction zones.

Cette invention se rapporte à un polyéthylène de densité moyenne et de poids moléculaire élevé (HMW, MDPE). Ce polyéthylène comprend environ 85 à environ 98 % en poids d'unités récurrentes d'éthylène et environ 2 à environ 15 % en poids d'une .alpha.-oléfine C¿3?-C¿10?. Il possède une densité comprise entre environ 0,92 et environ 0,944 g/cm?3¿, un indice de fusion MI¿2? compris entre environ 0,1 et environ 0,5 dg/min, et un rapport de fusion MFR compris entre environ 50 et environ 300. Il possède une répartition multimodale du poids moléculaire, en comprenant un composant de poids moléculaire élevé et un composant de poids moléculaire faible. Le composant de poids moléculaire faible a un indice de fusion MI¿2? compris entre environ 50 et environ 600 dg/min et une densité comprise entre environ 0,94 et environ 0,97 g/cm?3¿. Cette invention concerne également un procédé de fabrication de ce polyéthylène de densité moyenne. Ce procédé utilise un catalyseur de Ziegler et applique des zones de réaction multiples.

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