| abstract |
The present invention provides: a (vinyl alcohol)-based ion-exchange membrane having practical dimensional stability and electrodialysis performance; and a process for producing the ion-exchange membrane. The present invention relates to an ion-exchange membrane which gives an infrared absorption spectrum that satisfies the relationship (A):n30≤{Z-(X+Y)×30/2}/T (A)nwherein X is the absorbance at an absorption wavelength of 1,690 cm -1 , Y is the absorbance at an absorption wavelength of 1,720 cm -1 , Z is the integral for the region lying between absorption wavelengths of 1,690 cm -1 and 1,720 cm -1 , and T (cm) is the thickness of the ion-exchange membrane. |