POLYOLEFIN MICROPOROUS FILM

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PROBLEM TO BE SOLVED : To provide a polyolefin microporous film being suitable as an inexpensive separator excellent in safety, capable of preventing volume deterioration and cycle deterioration of an electric battery, having good impregnating ability of an electrolyte and making productivity of the electric battery high. SOLUTION : In the polyolefin microporous film, inorganic particles composed of a rare-earth oxide exist in at least void parts of the microporous film. COPYRIGHT : (C)2008, JPO&INPIT