| 摘要 |
PURPOSE:To obtain a gas separating membrane having excellent heat resistance, film formability and separating performance by using bis(3-aminophenyl)sulfone and methaphenylene diamine as a diamine component and isophthalic acid component as a main acid component. CONSTITUTION:After 30-95mol% bis(3-aminophenyl) sulfone and 5-70mol% methaphenylene diamine are dissolved in a polar solvent such as N-methyl pyrolidone, etc., the soln. is cooled and an isophthalic acid chloride is added thereto to effect reaction and to obtain a polymer. The soln. prepd. by dissolving such polymer in the N-methyl pyrolidone, etc., is cast on a PP film fixed on a glass sheet and thereafter the solvent is evaporated. The membrane is stripped from the film and is fixed onto a glass sheet. The membrane is subjected to the removal of the residual solvent and a heat treatment in a vacuum dryer, by which the gas separating membrane consisting of poly(amide.sulfone) is obtd.
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