| 摘要 |
PURPOSE: To prevent the elution of a soluble component by comprising a tubular outer layer made of polyamide 11 or the like, an intermediate layer made of polyamide 6, a solvent-blocking layer made of ethylene/vinyl alcohol copolymer and an inner layer of polyamide 6, and forming an adhesive layer made of polyethylene or the like between the outer layer and the intermediate layer. CONSTITUTION: An automobile multilayer tubing manufactured by an co- extrusion method comprises a tubular outer layer 1 made of polyamide 11 or polyamide 12, an intermediate layer 2 made of polyamide 6, a solvent- blocking layer 3 made of ethylene-vinyl alcohol copolymer, and an inner layer 4 made of polyamide 6. An adhesive layer 5 made of polyethylene or polypropylene is formed between the tubular layer 1 and the intermediate layer 2. As a result, the elution of the soluble component in the used synthetic resin by the amount which brings problems, can be prevented, and the remarkably high tensile strength and toughness can be provided.
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