Rotomolding process for polyethylene articles
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United States of America Patent
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Jan 22, 2013
Grant Date -
Dec 30, 2010
app pub date -
Apr 19, 2010
filing date -
Apr 21, 2009
priority date (Note) -
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Abstract
The present invention relates to a process for the production of polyethylene hollow articles, which process comprises charging the polyethylene with one or more NO-acyl hindered amine additives containing one or more groups of formula (I), filling this mixture into a mold, heating this mold in an oven to above 280° C., such that the additized polyethylene melts, rotating the mold around at least 2 axes, the additized polyethylene spreading to the walls, cooling the mold while still rotating, opening it, and taking the resultant hollow article out, where the group of formula (I) is
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