abstract |
Achieved by containing a heat-resistant resin and two or more kinds of the filler is, the second largest value, the greater of the value obtained, by first measuring the average particle diameter of particles that make up for each of the above kinds of filler to D 1, two beonjjae when a D 2, and the value of D 2 / D 1 less than or equal to 0.15 provides a porous film.n n n Porous film, filler, heat resistant resin, separator |