HEAT-RESISTANT SYNTHETIC RESIN MICROPOROUS FILM AND PROCESS FOR PRODUCING SAME, SEPARATOR FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

A heat-resistant synthetic resin microporous film is provided which is excellent in both heat resistance and permeability to ions such as lithium ions and does not make its production line dirty. A method of producing the heat-resistant synthetic resin microporous film is also provided. The production method of a heat-resistant synthetic resin microporous film includes causing 5 to 25 parts by weight of a radical-polymerizable monomer including a trifunctional or higher polyfunctional acrylic monomer to adhere to 100 parts by weight of a synthetic resin microporous film, and then irradiating the synthetic resin microporous film with ionizing radiation at an absorbed dose of 10 to 150 kGy.