abstract |
The present invention relates to a coating agent composition, which has excellent heat resistance and drying processibility, and uses a polyamic acid, which has high heat resistance and excellent solubility in a low-boiling point solvent. More specifically, the present invention relates to the coating agent composition containing the polyamic acid and the low-boiling point solvent of which the boiling point is lower than 150℃. Also, the present invention relates to a separation membrane of which heat resistance is enhanced by coating one or both surfaces of a polyolefin-based base material film with the coating agent composition, and to an electrochemical battery having improved thermal stability by using the separation membrane. |