Sumitomo Chemical Company, Limited

Kunihisa Satoh

Hiroshi Harada

Taketsugu Yamamoto

Katsuhiko Iwasaki

Atsushi Terahara

Kazushige Okamoto

Process for producing aromatic polyethers with high molecular weights

Provided is a polymer electrolyte which is cheap and easily synthesized, and has a high water resistance and high output performance. The polymer electrolyte comprising a sulfonated polymer having an ion-exchange group equivalent weight of 500 to 2500 g/mol, which is obtainable by sulfonating a structural unit represented by the structural formula (II) of a copolymer having 95 to 40 mol % of a structural unit represented by the following structural formula (I) and 5 to 60 mol % of a structural unit represented by the following structural formula (II), ##STR1##

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Toyonaka, Japan

Kunihisa Satoh