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US 7,923,166 B2Granted
Separating membrane for fuel cell
AssigneeTokuyama Corporation
InventorsKenji Fukuta, Kazuyuki Sadasue, Masayuki Kishino
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AssigneeTokuyama Corporation
InventorsKenji Fukuta, Kazuyuki Sadasue, Masayuki Kishino
Estimating the term…
The present invention discloses a membrane for a fuel cell, comprising: a solid polymer electrolyte membrane composed of a crosslinked ion exchange resin, and a polymer having a weight-average molecular weight of 5,000 to 1,000,000 and having a charge group of polarity opposite to that of the ion exchange group of the ion exchange resin, which polymer is adhered onto at least one surface of the solid polymer electrolyte membrane in an amount of 0.0001 to 0.5 mg/cm3, preferably in a state that, when the membrane for fuel cell is immersed in a 50 mass % aqueous methanol solution of 30° C., there is substantially no difference in the adhesion amount of the polymer before and after the immersion; and a membrane-electrode assembly for a fuel cell, comprising the above-mentioned membrane, and a catalyst electrode layer bonded to the membrane, which catalyst electrode layer contains an ion exchange resin having the same polarity as the crosslinked ion exchange resin composing the solid polymer electrolyte membrane, and a catalyst substance.
A membrane for a fuel cell, comprising:
A process for producing a membrane for a fuel cell, which comprises contacting at least one surface of a solid polymer electrolyte membrane composed of a crosslinked ion exchange resin, with a solution of a polymer of 5,000 to 1,000,000 in weight-average molecular weight, having a charge group having a polarity opposite to that of the ion exchange group of the ion exchange resin and then conducting drying to adhere, onto the surface of the solid polymer electrolyte membrane, said polymer in an amount of 0.0001 to 0.5 mg/cm2.
A process for producing a membrane for a fuel cell, which comprises contacting at least one surface of a solid polymer electrolyte membrane composed of a crosslinked ion exchange resin, with a solution of a polymer of 5,000 to 1,000,000 in weight-average molecular weight, having a charge group having a polarity opposite to that of the ion exchange group of the ion exchange resin, to obtain a solid polymer electrolyte membrane having, on the surface, said polymer having a charge group of opposite polarity, and then washing the solid polymer electrolyte membrane with a solvent capable of dissolving the polymer having a charge group of opposite polarity, to adhere the polymer on the surface of the solid polymer electrolyte membrane in an amount of 0.0001 to 0.5 mg/cm2.
Dependencies are inferred from the claim text.