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US 10,950,914 B2Granted
Porous film, separator for secondary batteries, and secondary battery
AssigneeToray Industries, Inc.
InventorsNobuyasu Kai, Kei Ikoma, Akimitsu Tsukuda
Life of this patent
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Abstract
A porous film includes a porous substrate, and a porous layer provided on at least one surface of the porous substrate. The porous layer includes the following resin A and resin B, and satisfies that α/β is less than 1.0, where α is a surface opening ratio of the porous layer and β is a cross-sectional porosity of the porous layer. The resin A is a resin having a melting point of 150° C. or higher, or a resin having no substantial melting point. The resin B is a resin having a melting point of lower than 150° C., or an amorphous resin.
Claims10
A porous film comprising:
- a porous substrate;
- and
- a porous layer provided on at least one surface of the porous substrate,
- wherein the porous layer includes resin A and resin B, and satisfies that α/β is less than 1.0, wherein α is a surface opening ratio of the porous layer and β is a cross-sectional porosity of the porous layer:
- resin A:
- a resin having a melting point of 150° C. or higher, or a resin having no substantial melting point;
- and
- resin B:
- a resin having a melting point of lower than 150° C., or an amorphous resin.
6 more elements
Dependencies are inferred from the claim text.