| 摘要 |
<p>Provided are a porous polypropylene film with excellent productivity, air permeability, mechanical properties, and heat resistance, and an electrical storage device. The present invention is a porous polypropylene film including a polypropylene resin having beta-crystal-forming capability, characterized in having a thickness of 10-30 mum, a hole rate of 55-85%, air-permeability resistance of 70-300 seconds/100 ml, puncture strength per 1 mum thickness of 0.18-0.50 N/mum, and a thermal contraction rate of 12% or less in the width direction when processed for 60 minutes at 135°C.</p> |
