Dispersion Composition of Fluorine-Containing Ion Exchange Resin

A method for producing a dispersion composition of fluorine-containing ion exchange resin comprising a copolymer having a repeating unit represented by formulae (1) and (2):

• —(CFZCF2)— (1)
• wherein Z represents H, Cl, F, or a perfluoroalkyl group having 1 to 3 carbon atoms;
• m represents an integer of 0 to 12;
• and n represents an integer of 0 to 2, and wherein the method comprises the steps of:
• mixing 1% by mass or more and less than 15% by mass of the fluorine-containing ion exchange resin having an equivalent weight of from 400 to 1000 g/eq into a mixed solvent containing 50.1% to 99.9% by mass of water and 0.1% to 49.9% by mass of alcohol;
• subjecting an aqueous composition comprising the fluorine-containing ion exchange resin to a dispersion treatment;
• and
• concentrating the aqueous composition subjected to the dispersion treatment, so that the concentration Cd (mass %) of the fluorine-containing ion exchange resin becomes 15% by mass or more and 45% by mass or less.