Electrolyte material, liquid composition and membrane/electrode assembly for polymer electrolyte fuel cell

2:

• The electrolyte material according to claim 1, wherein the proportion of the structural units (A) is from 13 to 18 mol %, the proportion of the structural units (B) is from 67 to 78 mol %, and the proportion of the structural units (C) is from 4 to 20 mol %, in 100 mol % of all structural units constituting the polymer (F).

3:

• The electrolyte material according to claim 1, wherein the following TQ value of the polymer (F) is from 250 to 330° C.:
• TQ value:
• a temperature at which the extrusion rate becomes 100 mm3/sec, when the polymer (F) is subjected to melt-extrusion under an extrusion pressure condition of 2.94 MPa from a nozzle having a length of 1 mm and an inner diameter of 1 mm.

4:

• The electrolyte material according to claim 1, wherein the ion exchange capacity of the polymer (H) is from 0.7 to 1.29 meq/g dry resin.

6:

• The electrolyte material according to claim 1, wherein each of Q1 and Q2 which are independent of each other, is a C1-6 perfluoroalkylene group which may have an etheric oxygen atom.

7:

• The electrolyte material according to claim 6, wherein at least one of Q1 and Q2 is a C1-6 perfluoroalkylene group having an etheric oxygen atom.

8:

• The electrolyte material according to claim 1, wherein at least one type of the structural units (B) is structural units represented by the follo

9:

• A liquid composition, comprising a dispersion medium and the electrolyte material as defined in claim 1, dispersed in the dispersion medium, wherein the dispersion medium comprises an organic solvent having a hydroxy group.

10:

• The liquid composition according to claim 9, comprising from 1 to 50 mass % of the electrolyte material.

11:

• A catalyst layer in an electrode of a membrane/electrode assembly for a polymer electrolyte fuel cell, the catalyst layer comprising a proton conductive polymer formed of the electrolyte material of claim 1.

12:

• A membrane/electrode assembly for a polymer electrolyte fuel cell, the membrane/electrode assembly comprising an anode having a catalyst layer containing a proton conductive polymer, a cathode having a catalyst layer containing a proton conductive polymer, and a polymer electrolyte membrane disposed between the anode and the cathode,
• wherein the proton conductive polymer contained in the catalyst layer of at least one of the cathode and the anode is the electrolyte material of claim 1.