| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystalline polymer microporous film which can efficiently catch fine particles, has longer filtration life to reduce cartridge replacement and can be used for large equipment by using a higher flux film, to provide a method of manufacturing the crystalline polymer microporous film capable of efficiently manufacturing the crystalline microporous film, and to provide a filter for filtration using the crystalline polymer microporous film. SOLUTION: In the crystalline polymer microporous film, average pore size on one side surface is larger than the average pore size on the other surface, the average pore size continuously decreases from the one side surface toward the other side surface, and the average pore size on the other side surface is 0.05μm to 10μm. COPYRIGHT: (C)2009,JPO&INPIT
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