| 摘要 |
PURPOSE:To improve the resistance to sour gasoline, by forming a terpolymer rubber of an alpha,beta-unsaturated nitrile, a conjugated diene and a fluoroalkyl acrylate at least on the liquid contacting surface side. CONSTITUTION:Only the liquid contacting surface side (L) of the diaphragm 2 or all of the diaphragm is formed with a terpolymer rubber of an alpha,beta-unsaturated nitrile, a conjugated diene and a fluoroalkyl (meth)acrylate or a rubber composition containing the terpolymer and a vinyl chloride resin. The molar ratio of the constituents of the termpolymer is 15-60% by mol of an alpha,beta-unsaturated nitrile, 10-75% by mol of a conjugated diene, and 2-55% by mol of a fluoroalkyl acrylate. The obtained diaphragm is excellent in resistance to sour gasoline and gasohol, and good in physical state properties under normal condition. |
