Multi-layer rotationally molded low permeation vessels and method for manufacture thereof
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United States of America Patent
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May 13, 2014
Grant Date -
Oct 13, 2011
app pub date -
Jun 22, 2011
filing date -
Dec 15, 2006
priority date (Note) -
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Abstract
A method to form a multiple walled enclosure with low permeation properties and rugged impact resistance useful as a fuel tank or chemical container. The enclosure is made by rotomolding a first charge of thermosetting polymer into an outer layer, then rotomolding a charge of EVOH or other low permeation thermoplastic into a second layer, then rotomolding a second charge of thermosetting polymer into a third layer so that the low permeation thermoplastic layer is fully enclosed by layers of thermoset polymer. The preferred thermosetting polymer is crosslinkable polyethylene and the preferred low permeation thermoplastic is EVOH.
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