| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-permeable material having good oil repellency, water resistance and air permeability. SOLUTION: The air-permeable material contains two polytetrafluoroethylene porous membranes of different average pore sizes, and the membrane of the larger average pore size alone is treated to impart oil repellency. Preferably, the membrane of the larger average pore size preferably has an average pore size of≥1.0μm, and that of the smaller average pore size has an average pore size of smaller than 1.0μm. COPYRIGHT: (C)2008,JPO&INPIT
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