Sumitomo Chemical Company, Limited

Toyota Jidosha Kabushiki Kaisha

Shin Saito

Ryuma Kuroda

Masayoshi Takami

Katsuhiko Iwasaki

Hiroyuki Kurita

Atsushi Terahara

Kentaro Masui

Mitsuyasu Kawahara

The present invention is to provide an electrolyte membrane which retains durability even after having undergone a dimensional change accompanying chemical deterioration caused owing to radicals having high oxidizing ability such as hydroxyl radicals (.OH) or peroxide radicals (.OOH), and the selecting method thereof. An electrolyte membrane has an amount of dimensional change in a plane direction between dimensions obtained in a dry state before and after carrying out the Fenton test, the amount of dimensional change before and after the Fenton test being smaller than an amount of maximum elastic deformation in a plane direction obtained in dry state before carrying out the Fenton test, provided that the Fenton test is carried out under the following condition, and the selecting method of the same. &#x3c;Condition of Fenton test&#x3e; (1) iron ion (Fe) concentration: 4 ppm, (2) hydrogen peroxide concentration: 3 wt %, (3) boiling temperature: 80&#xb0; C., (4) boiling time: 120 minutes.

Electrolyte membrane and method of selecting the same

A process for producing a polymer electrolyte emulsion having the following steps (1) and (2) is provided. Step (1): a step of dissolving a polymer electrolyte in a solvent comprising a good solvent for the polymer electrolyte to prepare a polymer electrolyte solution having a polymer electrolyte concentration of 0.1 to 10% by weight. Step (2): a step of mixing the polymer electrolyte solution 10 obtained in the step (1), and a poor solvent for the polymer electrolyte at a ratio of 4 to 99 parts by weight of the poor solvent based on 1 part by weight of the polymer electrolyte solution. In addition, a process for producing a polymer 15 electrolyte emulsion comprising separating a polymer electrolyte dispersion in which a polymer electrolyte particle is dispersed in a dispersing medium, with a membrane is provided.

Process for producing polymer electrolyte emulsion

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Tsukuba, Japan

Shin Saito