| abstract |
The present invention provides a resin composition containing the following resin (a) and filler particles. When this composition is used, a separator excellent in heat resistance can be obtained. Resin (a): a polymer containing the structural unit represented by the formula (1) and having a weight average molecular weight in the range of 200,000 to 500,000 (however, the structural unit represented by the formula (2) is not included) (in the formula, Mn + represents the metal ion, and n represents its valence.). |