METHODS AND COMPOSITIONS FOR PRODUCING PIPE HAVING IMPROVED OXIDATIVE RESISTANCE
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United States of America Patent
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Issued Date -
May 24, 2012
app pub date -
May 28, 2010
filing date -
May 29, 2009
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Abstract
Flexible polymeric pipes may have an outer diameter of at least 5/16 inch, with a wall thickness of between 1.75 mm and 2.05 mm and a burst strength of at least 300 psi. The flexible polymeric pipe may include at least 95% by weight of the polymeric pipe of a cross-linked polyethylene, between 0.1% and 0.5% by weight of the polymeric pipe of a cross-linking agent, between 0.05% and 0.6% by weight of the polymeric pipe of an antioxidant, and between 0.01% and 0.6% by weight of the polymeric pipe of a hindered amine light stabilizer.
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