| abstract |
The present invention provides a PAI solution capable of obtaining a porous polyamideimide (PAI) film having excellent heat resistance, high porosity, and continuous pores, a method for producing the same, a porous PAI film obtained from the solution, and a method for producing the same . It is a PAI solution containing a nitrogen-containing polar solvent and an ether-based solvent, the solid content concentration of the PAI is 25 mass % or less relative to the mass of the PAI solution, and the content of the nitrogen-containing polar solvent is 15 mass % or more relative to the mass of the PAI solution. , the content of the ether-based solvent is greater than 30% by mass relative to the mass of the PAI solution. The manufacturing method of the said PAI solution melt|dissolves solid PAI in the mixed solvent containing a nitrogen-containing polar solvent and an ether solvent. The method for producing the porous PAI film of the present invention is to apply the above-mentioned PAI solution on a substrate, and then dry it at a temperature of 200° C. or lower. Porous PAI membranes are produced by the above method. |