| 摘要 |
PURPOSE:To obtain a high-fuction hose where a buldge does not generate, by specifying a thickness of an inner pipe of a hose, a thickness ratio between an inner layer of the inner pipe of the hose and an outer layer of the same and the modulus which is one of physical properties of rubber. CONSTITUTION:When the whole thickness of an inner pipe of a hose is lo (cm), a thickness ratio of an outer layer of the inner pipe to the whole thickness lo of the inner pipe is r, the 50% modulus at a working temperature of a rubber composition of an outer layer of the inner pipe is M1 (kg f/cm<2>) and the 50% modulus at the working temperature of the rubber composition of an inner layer of the inner pipe is M2 (kg f/cm<2>), a relation of formulas I, II are satisfied. Now it is favorable that the foregoing inner layer of the inner pipe is constituted of copolymer rubber possessing 10-45wt.% unit part from unsaturated nitrile, 0-5wt.% unit par from conjugated diene and 90-50wt.% unit part from ethylenic unsaturated monomer and/or unit part obtained by hydrogenizing the unit part from the conjugated diene. |
