POLYOLEFIN MICROPOROUS FILM, SEPARATOR FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, WOUND PRODUCT OF POLYOLEFIN MICROPOROUS FILM, NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND METHOD FOR PRODUCING POLYOLEFIN MICROPOROUS FILM

摘要

The purpose of the present invention is to provide: a polyolefin microporous film which has excellent puncture strength and air resistance, does not undergo wrinkling or misalignment upon being wound and therefore enables the production of a wound product having excellent appearance; the wound product; and a method for producing a polyolefin microporous film. A polyolefin microporous film characterized by having puncture strength of 400 gf or more when the film has a thickness of 16 μm and also having air resistance of 100 to 400 sec/100 cc when the film has a thickness of 16 μm, and also characterized in that the static friction coefficient of the film is 0.5 to 1.0 as measured by superposing the front surface and the back surface of the film on each other.