Patent ID: 6230749
Filing Date: 2001-05-15
Classification: B32B,F16L

Abstract:
A multilayer tube comprising:a first outer thermoplastic layer;a second inner thermoplastic diffusion barrier layer directly bonded to the first layer and having a thickness of from about 0.1 to about 0.6 mm; anda third layer bonded to the second layer,wherein the first and third layers comprise one or more thermoplastic etheresterelastomers, the second layer comprises one or more polybutylene terephthalates, at least one of the layers has an elongation value at break of at least about 130%, at least one of the layers comprises a heat stabilizer, the tube is able to withstand 1,000 hours or more of contact with fuels without the layers delaminating, and the tube is able to withstand 1,000 hours or more in an antifreeze mixture of 5 to 50 percent by volume of methanol in water at from about -20 to about 80.degree. C. without the layers delaminating.