| abstract |
Disclosed is a micropore forming agent for a porous resin film that can provide a resin composition that provides a porous resin film suitable for electrical applications such as capacitors and battery separators. The inorganic particles contain at least one metal selected from alkaline earth metals, silicon, titanium, and aluminum, and the inorganic particles have a chelating ability to the surfactant (A) and / or the metal. (A) 0.1 ≦ D50 ≦ 1.5 (μm) (D50: 50% cumulative total weight average particle starting from the large particle side in Microtrac FRA) Diameter), (b) Da ≦ 20 (μm) (Da: maximum particle diameter in Microtrac FRA), (c) 3 ≦ Sw ≦ 60 (m 2 / g) (Sw: BET specific surface area by nitrogen adsorption method), (D) A pore forming agent for a porous resin film that satisfies Ir ≧ 1.0 × 10 5 (Ω · cm) (Ir: volume resistivity of hydrochloric acid insoluble matter). [Selection figure] None |