| abstract |
Provided are a heat-resistant synthetic resin microporous film having enhanced heat resistance while having reduced deterioration of mechanical strength, and a method for producing the same. Disclosed is a heat-resistant synthetic resin microporous film which includes a synthetic resin microporous film containing a synthetic resin; and a coating layer formed on at least a portion of the surface of the synthetic resin microporous film and containing a polymer of a polymerizable compound having a bifunctional or higher-functional radical polymerizable functional group, the heat-resistant synthetic resin microporous film having a surface aperture ratio of 30% to 55%, gas permeability of 50 sec/100 mL to 600 sec/100 mL, a maximum thermal shrinkage obtainable when the film is heated from 25° C. to 180° C. at a rate of temperature increase of 5° C./min, of 20% or less, and a piercing strength of 0.7 N or more. |