MICROPOROUS FILM

摘要

PROBLEM TO BE SOLVED: To obtain a microporous film excellent in permeability and a mechanical strength and having film-tearing resistance at a high temperature and to provide a separator for a nonaqueous electrolyte battery obtained by using the microporous film and the nonaqueous electrolyte battery composed by using the separator. SOLUTION: This microporous film has 20-90% gel fraction after immersing in boiled xylene for 3 h. The separator for the nonaqueous electrolyte battery is composed of the microporous film. The nonaqueous electrolyte battery is provided by using the separator.