| 摘要 |
PROBLEM TO BE SOLVED: To provide a small film for a capacitor, whose performance scarcely deteriorates extending over a long period. SOLUTION: A porous polyamide film provided with a fine nonlinear through- hole and having a porous structure where the coefficient of vacancy is 35-85%, the bore diameter is 0.01-5μm and the film thickness is 5-50μm. The film has a structure, where a fine-porous layer and layer that has a relatively large cavities or opening are piled in the cross-sectional direction of the film, and these two layers are coupled with each other with a through fine hole.
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