| 摘要 |
Provided are: a porous polypropylene film that exhibits excellent gas permeability and resistance to organic solvents, wherein when said film is coated with a functional layer such as a heat-resistance layer, the physical properties of said film do not change much; a layered porous film; and an electricity-storage device. Said porous polypropylene film, which contains a polypropylene resin that can form a beta crystal structure, is characterized by a gas permeation resistance of 1,000 sec/100 ml or less and further characterized in that an acetone-immersion treatment changes the thickness of the porous polypropylene film by no more than 20%. |
