| abstract |
Disclosed is a thin porous film with an aromatic polyamide as a constituent component, and with high heat resistance, high air permeability and good affinity to electrolytes. The aromatic polyamide porous film contains an aromatic polyamide and a hydrophilic polymer with 12 to 50 parts hydrophilic polymer per 100 parts aromatic polyamide, by mass, and has a membrane thickness of 2 to 30 micrometers, Gurley air permeability of 0.5 to 300 s/100ml, and thermal shrinkage of -0.5 to 1.0% at 200°C. |