Composite ion exchange membrane and electrolyte membrane electrode assembly
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United States of America Patent
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May 26, 2009
Grant Date -
May 5, 2005
app pub date -
Feb 3, 2003
filing date -
Feb 15, 2002
priority date (Note) -
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Abstract
The present invention provides a composite ion exchange membrane which has high mechanical strength and is suitable for use as a solid polymer electrolyte membrane excellent in ionic conductivity and a method for its production. The invention is achieved by a composite ion exchange membrane including a composite layer comprising a support membrane with continuous voids formed of polybenzazole polymer, the support membrane being impregnated with ion exchange resin, and surface layers formed of ion exchange resin free of support membranes, the surface layers being formed on both surfaces of the composite layer so as to sandwich the composite layer therebetween.
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