HEAT-RESISTANT SYNTHETIC RESIN MICROPOROUS FILM AND METHOD FOR PRODUCING SAME

摘要

Provided are: a heat-resistant synthetic resin microporous film in which decreases in mechanical strength over time are minimized, the heat-resistant synthetic resin microporous film having exceptional heat resistance and mechanical strength; and a method for producing the same. This heat-resistant synthetic resin microporous film is characterized by including: a synthetic resin microporous film; and a coating layer that is formed on at least a part of the synthetic resin microporous film surface, the coating layer containing a polymer of a polymerizable compound that has two or more radical-polymerizable functional groups within the molecule, the film having a maximum heat shrinkage rate of 15% or less when heated at a rate of temperature increase of 5°C/min from 25°C to 180°C, a piercing strength of 0.6 N or higher, and a rate of retention of piercing strength of 85% or higher after being heated at 70°C for 168 hours.