| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic-inorganic composite film which is useful for a separator material, and has all of lightness in weight, the adhesion between a base film and a heat-resistant layer, and the property of keeping the porosity of the base film.SOLUTION: An organic-inorganic composite film comprises: a base film composed of a polyolefin microporous film; and a heat-resistant layer provided on at least one face of the base film, and including inorganic heat-resistant particles and a binder. The organic-inorganic composite film satisfies all of the conditions (A), (B) and (C) below. The condition (A) is a≤1.5 (where a represents a density of the heat-resistant layer (g/m/μm)). The condition (B) is 12.74≤b, where b is a peel strength (N) of the base film and the heat-resistant layer. The condition (C) is c≤20, where c represents a permeability change rate (%) determined by the following expression: Permeability change rate (%)=|(Permeability of Organic-inorganic composite film)-(Permeability of Base film)|÷(Permeability of Base film)×100).SELECTED DRAWING: None |
