| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an aromatic polyamide porous film having transparency without sacrificing air permeability by use of a block copolymerized polymer of flexible aromatic polyamide and rigid aromatic polyamide, and to provide a separator for a secondary battery arranged by use thereof.SOLUTION: An aromatic polyamide porous film has a film thickness of 10-30μm, and a transmittance of 20-80% to light having a wavelength of 750 nm.</p> |
