To provide a laminated porous film having excellent air permeability and mechanical strength, and having a shut-down characteristic.
In the laminated porous film in which at least two porous layers are laminated, the two layers contain polypropylene resins. One of the two layers contains a thermoplastic resin having a peak crystal melting temperature of 100C to 150C, while the other one layer does not include the thermoplastic resin having the peak crystal melting temperature of 100C to 150C, and has activity and/or crystal formation power. On the other hand, the two layers contain the polypropylene resins, and thermoplastic resins each having the peak crystal melting temperature of 100C to 150C, wherein contents of the two thermoplastic resins of these two layers are made to differ from each other, and the laminated porous film has the activity and/or the crystal formation power.
USAMI YASUSHI
TAKAGI JUN
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