| 摘要 |
The object of the present invention is to provide a vinyl monomer containing a superacidic ester group useful in the production of ionomers for polymer electrolyte fuel cells, and its production process. In addition, another object of the present invention is to provide a polymer produced from said vinyl monomer and its production process, as well as a process for producing a polymer containing a superacidic group from said polymer. The inventive vinyl monomer contains a haloalkyl ester group of a superacid, wherein the number of carbon atoms of the haloalkyl ester group is no more than 10, and the halogen in the haloalkyl group is chlorine and/or fluorine. A polymer containing said vinyl monomer as a repeating unit can be converted to a polymer containing a superacid group using at least one procedure of 1) heat treating at 50° C. to 350° C., and 2) contacting with a protic compound.
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