ORGANIC-INORGANIC COMPOSITE FILM, AND MULTI-LAYER HEAT RESISTANT SEPARATOR MATERIAL USING SAME
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Mar 8, 2016
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Mar 12, 2015
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Abstract
The present invention addresses the problem of providing an organic-inorganic composite film that is useful as a separator material. The problem is addressed by an organic-inorganic composite film characterized in that a heat-resistant layer that contains inorganic heat resistant particles and a binder is provided on at least one surface of a base material film comprising a polyolefin microporous film, said organic-inorganic composite film satisfying all of the following conditions (A), (B), and (C): Condition (A): a≦1.5 (a: density of heat resistant layer (g/m2/μm), condition (B): 12.74≦b (b: peel strength (N) of base material film and heat resistant layer), condition (C): c≦20 (c: represents the percentage change in air permeability (%) calculated from the following equation. Percentage change in air permeability (%)=|(air permeability of organic-inorganic composite film)−(air permeability of base material film)|÷(air permeability of base material film)×100).
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