Process for making tailored polyetheylene resins for sheets
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United States of America Patent
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Nov 15, 2016
Grant Date -
Apr 26, 2012
app pub date -
Mar 9, 2007
filing date -
Mar 10, 2006
priority date (Note) -
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Abstract
This invention relates to coupling of polyethylene resins, more specifically coupling of polyethylene resins for use in extruded profiles, especially extruded profiles for sheet extrusion and cut sheet thermoforming applications and geomembranes. The process involves conveying a HDPE resin through an extruder, wherein the extruder comprises a feed zone, a first melt zone downstream of the feed zone, a second melt zone downstream of the first melt zone, and a third melt zone downstream of the second melt zone. The resin is melted in the first zone, contacted with oxygen in the second melt zone, and contacted antioxidant in the third melt zone.
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