Patent ID: 8597747
Filing Date: 2013-12-03
Classification: B29C,B29K,B29L,B32B,B65D,Y10T

Abstract:
1. A vessel comprising a rotomolded hollow seamless fuel tank, the fuel tank comprising: an impact resistant external wall comprising a thermally cured thermoset polymer, the external wall formed by sintering and melting a high flow base thermosetting polymer resin in an enclosing mold as the mold is rotated about two axes, the thermosetting polymer resin having good mold reproducibility, the external wall including internal surfaces, an intermediate coating comprising low permeation thermoplastic polymer on the internal surfaces of the external wall, the low permeation thermoplastic polymer formed by sintering and melting a low permeation thermoplastic polymer resin in the enclosing mold while further rotating the mold about two axes, the intermediate coating being an evenly distributed homogenous layer on all of the internal surfaces of the external wall, the intermediate coating including internal surfaces, an impact resistant internal coating comprising thermally cured thermoset polymer on the internal surfaces of the intermediate coating, the internal coating formed by sintering and melting additional thermosetting polymer resin in the enclosing mold as the mold is rotated about two axes, the cured thermoset polymer of the external wall is crosslinked polyethylene, the low permeation thermoplastic polymer of the intermediate coating is ethylene-vinyl alcohol copolymer, the ethylene-vinyl alcohol copolymer having a melt flow index greater than 4.2 g/10 minutes at 190° C. using a 2160 g load, the cured thermoset polymer of the internal coating is crosslinked polyethylene.