20-02-2014 дата публикации
Номер: US20140048544A1
Принадлежит:
CENTRO, INC.
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. 1. A vessel comprisingan external wall comprising a cured thermoset polymer;an intermediate coating comprising low permeation thermoplastic polymer on an internal surface of the external wall;an internal coating comprising cured thermoset polymer on an internal surface of the intermediate coating.2. The vessel of whereinthe external wall is crosslinked polyethylene,the intermediate coating is ethylene-vinyl alcohol copolymer,the internal coating is crosslinked polyethylene.3. The vessel of whereina first intermediate layer of tie material is interposed between the external wall and the intermediate coating.4. The vessel of whereina second intermediate layer of tie material is interposed between the intermediate coating and the internal coating.5. The vessel of whereinthe first intermediate layer and the second intermediate layer are from the group consisting of maleic anhydride, maleic anhydride, grafted polyethylene, anhydride modified ethylene vinyl acetate, and ethylene methyl acrylate.6. The vessel of whereinthe external wall further comprises an adhesion agent,the intermediate coating further comprises the adhesion agent,the internal coating further comprises the adhesion agent,the adhesion agent is taken from the group consisting of maleic anhydride, maleic anhydride grafted polyethylene, anhydride modified ethylene vinyl acetate, and ethylene methyl ...
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