SAUERSTOFFEINSTELLUNG FÜR POLYETHYLENHARZE

A process for extruding a bimodal polyethylene resin wherein polyethylene homopolymer or copolymer having a bimodal molecular weight distribution is conveyed through an extruder and contacted with oxygen. The resin is processed in an extruder having a feed zone 32 in which the resin is not melted, a...

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Bibliographische Detailangaben
Hauptverfasser: SHANNON, PORTER, C, LOTTES, JAMES, F, SCHREGENBERGER, SANDRA, D, SHIRODKAR, PRADEEP, P
Format: Patent
Sprache:ger
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Beschreibung
Zusammenfassung:A process for extruding a bimodal polyethylene resin wherein polyethylene homopolymer or copolymer having a bimodal molecular weight distribution is conveyed through an extruder and contacted with oxygen. The resin is processed in an extruder having a feed zone 32 in which the resin is not melted, a mixing zone 34 in which at least a portion of the resin is melted, and a melt zone 36 in which the resin is in a molten state. Each extrusion zone is partially filled with resin an is contacted with a gas mixture containing oxygen in 8 to 40 % by volume in the melt zone 36. The resulting oxygen-tailorer resin can be used to make polyethylene films having improved bubble stability. The resin can be further pelletized.