| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure having excellent characteristics as a structure useful for a gasoline transporting pipe. SOLUTION: The multilayered structure based on polyamides comprises: a first layer (1) composed of a polyamide P<SB>1</SB>or a mixture of the polyamide P<SB>1</SB>and a polyolefin PO<SB>1</SB>containing the polyamide P<SB>1</SB>as a matrix; an optional layer (2a) comprising EVOH; a layer (2) comprising a mixture of 6/12 copolyamides in which one has a weight of PA-6 greater than that of PA-12 and another has a weight of PA-12 greater than that of PA-6; and a layer (3) composed of a polyamide P<SB>3</SB>in this order, wherein each layer adheres one another on a contact region, and P<SB>1</SB>and P<SB>3</SB>are same or different from each other. A pipe having an inside of the layer (1) or (1a) and an outside of the layer (3) can be made, and be manufactured by coextrusion. The first layer may contain an electroconductive carbon black which makes a surface resistivity not higher than 10<SP>6</SP>ohm. COPYRIGHT: (C)2009,JPO&INPIT
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