| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fluororesin porous membrane comprising a porous fluororesin such as a PTFE porous membrane and having hardly dryable property and superior properties inherent to fluororesin porous materials. <P>SOLUTION: The membrane is formed of a porous fluororesin and includes an outer layer on both surface sides of the membrane and an inner layer present between the outer layers. The outer layer shows a bubble point of 70 kPa or lower, while the inner layer shows a bubble point of 90 kPa or higher. The fluororesin porous membrane is subjected to a chemical etching process on the both surfaces. The fluororesin porous membrane, in particular, a polytetrafluoroethylene porous membrane, is subjected to a roughening process by a physical means on the both surfaces. <P>COPYRIGHT: (C)2012,JPO&INPIT |
