| 摘要 |
PROBLEM TO BE SOLVED: To provide a tube of multilayer plastic material having excellent moldability which is low permeable to hydrogen, oxygen, carbon dioxide, sulfer dioxide, nitrogen oxide or the like, and undecomposable by a transfer liquid, and can be flexibly mounted to a circulation path. SOLUTION: The tube comprises an inner layer of fluoropolymer, an intermediate layer of ethylene-vinyl alcohol copolymer, and an outer layer of polyamide. As a form, the fluoropolymer is ethylene-tetra fluoroethylene or polyvinylidene fluoride, and the polyamide is polyamide 12. The polyamide is modified to form a hydrogen barrier, and comprises an adhesive layer 2 adhering the intermediate layer 3 to the inner layer 1, an adhesive layer 4 adhering the intermediate layer 3 to the outer layer 5, or the polyamide (PA) is modified so that the adhesive layers 2, 4 adhere to an adjacent layer. COPYRIGHT: (C)2006,JPO&NCIPI |
