| abstract |
A multilayer porous membrane having a porous membrane containing a polyolefin resin as a main component, and a porous layer comprising inorganic particles and a binder polymer laminated on at least one side of the porous membrane, wherein the total thickness of the porous layer is 0.5 μm or more and 3.0 μm or less, the number of pores having an area of 0.001 µm 2 or more in the porous layer is 65 or more and 180 or less per 10 µm 2 field of view, and among the pores having an area of 0.001 µm 2 or more in the porous layer, 0.001 µm 2 A multilayer in which the ratio of pores in the range of to 0.05 μm 2 is 90% or more, the proportion of inorganic particles in the porous layer is 90% by mass or more and 99% by mass or less, and the aspect ratio of the inorganic particles is 1.0 or more and 3.0 or less A sclera is provided. |