To provide a method for producing a liquid composition or a coating liquid for forming a catalyst layer, which can make cracking less likely to occur at the time of forming a solid polymer electrolyte membrane or a catalyst layer; and a method for producing a membrane electrode assembly, which can make cracking less likely to occur at the time of forming the catalyst layer or the solid polymer electrolyte membrane. This liquid composition is prepared by dispersing in a medium containing water and a hydrocarbon-type alcohol a polymer (x) having a structural unit having a ring structure and a structural unit having an ion exchange group, or a polymer (y) having either one or both of a structural unit having two ion-exchange groups in a pendant group and a structural unit having one ion exchange group in a short-chain pendant group, to prepare a dispersion in which the concentration of the polymer (x) or the polymer (y) is from 10 to 26 mass%, and mixing the dispersion and a fluorinated solvent so that the sum of the concentration of the polymer (x) or the polymer (y) and the concentration of the fluorinated solvent becomes to be from 12 to 35 mass%.
提供一种生产用于形成催化剂层的液体组合物或涂覆液的方法,该方法可在形成固体聚合物电解质膜或催化剂层时减少裂纹的发生;以及一种生产膜电极组件的方法,该方法可在形成催化剂层或固体聚合物电解质膜时减少裂纹的发生。这种液体组合物的制备方法是:将具有环状结构的结构单元和具有离子交换基团的结构单元的聚合物 (x) 或具有在一个悬垂基团中具有两个离子交换基团的结构单元和在一个短链悬垂基团中具有一个离子交换基团的结构单元中的一个或两个的聚合物 (y) 分散在含有
水和烃类醇的介质中、制备聚合物 (x) 或聚合物 (y) 浓度为 10 至 26 质量%的分散液,并将分散液与含
氟溶剂混合,使聚合物 (x) 或聚合物 (y) 浓度与含
氟溶剂浓度之和达到 12 至 35 质量%。