Polyamide- and EVOH-based multilayer tube for fluid transfer
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United States of America Patent
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Jun 20, 2006
Issued Date -
N/A
app pub date -
Mar 25, 2002
filing date -
Mar 23, 2001
priority date (Note) -
Expired
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Abstract
A multiplayer tube comprising: an outer layer formed from a polyamide, a layer formed from a copolyamide, a layer formed from an EVOH, a layer formed from a copolyamide, and an inner layer formed from a polyamide, the layers being successive and adhering to one another in their respective contact region. Advantageously, the inner layer is formed by a compound based on a polyamide and electrically conducting carbon black, producing a surface resistivity of less than 10.sup.6 .OMEGA.. The tubes have a very low permeability to petrol, particularly to hydrocarbons and their additives, and in particular to alcohols, such as methanol and ethanol, or to ethers, such as MTBE or ETBE. These tubes also have good resistance to engine lubricating oils as well as fuels.
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