| 摘要 |
PROBLEM TO BE SOLVED: To provide a protection cover which is available in a transducer of a microphone, a speaker or the like and is superior in breathability and waterproofness.SOLUTION: A polyimide porous film includes an aromatic polyimide obtained from: a tetracarboxylic acid component containing a component selected from biphenyl tetracarboxylic acid components and pyromellitic acid components; and an aromatic diamine compound containing an aromatic diamine selected from among benzene diamine components, diamino diphenyl ether components, and bis(amino phenoxy) phenyl components. |
