NOVELTY - A solid polymer electrolyte material is made of a copolymer comprising repeating units based on fluoromonomer A and fluoromonomer B of specified formula. The fluoromonomer A on radical polymerization gives a polymer having an alicyclic structure in the main chain.    USE - As polymer electrolyte for lithium ion cell, as cation exchange resin, as sensor employing modified electrode, as ion exchange filter for removing trace amounts of ions in air or an actuator. The membrane formed using the electrolyte is used as cation permselective membrane for electrolysis of sodium chloride and water, production of hydrogen peroxide and ozone, for recovering waste acid, as cation exchange membrane for electrolysis in desalination or salt production, for diffusion dialysis in separation and purification of an acid, base and salt, as charged porous membrane for separation of protein and as dehumidifying and humidifying membranes. The solid polymer fuel cell is used as power source for vehicles such as electric car or for a small size cogeneration system.    ADVANTAGE - The solid polymer fuel cell has high power generation efficiency and high output density when the operation temperature is low. The utilization ratios of anode reaction gas and cathode reaction gas are high. The fluoropolymer has excellent ionic conductivity, water repellency and gas permeability hence the solid polymer material made using the fluoropolymer is excellent. A constant high electric output is obtained since the solid polymer fuel cell contains the polymer electrolyte material as a constituting material. Thus the solid polymer cell operable even at very high temperature. The solid polymer electrolyte material is durable, has improved cell life and does not shrink.    DETAILED DESCRIPTION - A solid polymer electrolyte material is made of a copolymer comprising repeating units based on fluoromonomer A which gives a polymer having an alicyclic structure in the main chain by radical polymerization, and fluoromonomer B of formula (B).    CF2=CF(Rf)jSO3M (B)    j = 0 or 1;    X = fluorine, chlorine or OM;    M = H, alkali metal or NR1R2R3R4;    R1-R4 = H or monovalent organic group;    Rf = 1-20C optionally branched polyfluoroalkalylene, which may contain ether oxygen atoms.    INDEPENDENT CLAIMS are also included for the following:    (i) A liquid composition comprising an organic solvent having a hydroxyl group, and the solid polymer electrolyte material;    (ii) A solid polymer fuel cell comprising an anode, cathode and a polymer electrolyte membrane disposed between anode and cathode. The cathode contains the solid polymer electrolyte material;    (iii) A fluoropolymer comprising a copolymer containing repeat unit of formula (I) and a repeat unit based on a fluoromonomer D of formula (II). The content of the repeat unit based on the fluoromonomer D is 10-75 mol.%, and the number average molecular weight is 5,000-5,000,000; and    (iv) A solid polymer electrolyte membrane made of a polymer electrolyte comprising a copolymer consisting of a repeat unit of formula (I), a repeat unit based on a fluoromonomer D of formula (II) and a repeat unit based on tetrafluoroethylene. The content of repeat unit of formula (I) and the content of repeat unit based on tetrafluoroethylene is 20-60 mol.%, respectively. The content of repeating unit based on fluoromonomer D is 10-40 mol.%.    CF2=CFO(CF2CFYO)k'(CF2)2SO3M (II)    Rf16, Rf17, Y = fluorine or trifluoromethyl; and    k1 = 0 or 1.