Porous film and electricity storage device
AssigneeUbe Industries, Ltd.
InventorsRyo SAKIMOTO, Akihiro MATSUBAYASHI, Shusei OHYA, Taiga ADACHI
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Abstract
A porous film including a micro porous film in which a fibril diameter arranged in a direction perpendicular to an MD direction is 50 nm or more and 500 nm or less, a pore diameter is 50 nm or more and 200 nm or less, and a surface opening ratio is 5% or more and 40% or less. In the porous film, the micro porous film may include either one or both of a polyethylene resin and a polypropylene resin.
Claims11
A porous film comprising[[:]] a micro porous film in which a fibril diameter arranged in a direction perpendicular to an MD direction is 50 nm or more and 500 nm or less, a pore diameter is 50 nm or more and 200 nm or less, and a surface opening ratio is 5% or more and 40% or less.
Dependencies are inferred from the claim text.