| 摘要 |
PURPOSE:To reduce influence of thermal expansion/contraction so as to improve the cushion performance and the gas seal performance by forming a porous seal tape while laminating and integrating at least two layers of porous fluororesin sheet. CONSTITUTION:Fluororesin such as PTFE, tetra-fluoroethylene-perfluoroalkyl- vinylether copolymer is formed into a porous sheet having the hole diameter of 0.01-10mum, the porosity of 60-95%, the apparent specific gravity lower than 1.5 and the thickness of 0.02-5mm. Then it is laminated at least in two layers, preferably 15-70 layers, to produce a porous seal tape having the porosity of 50-70% and the thickness of 0.3-2mm. It is employed as a seal tape at the position requiring gas seal such as the circumference of an electrode of a fuel cell. Consequently, a good gas seal performance having excellent cushion performance, improved heat-resistance, medicine-resistance, etc. can be achieved. |
