| US 7,537,852 B2 | ||
| Composite ion exchange membrane and electrolyte membrane electrode assembly | ||
| Shiro Hamamoto, Otsu (Japan); Satoshi Takase, Otsu (Japan); Yoshimitsu Sakaguchi, Otsu (Japan); Shigenori Nagahara, Otsu (Japan); Kota Kitamura, Otsu (Japan); Junko Nakao, Otsu (Japan); and Kousuke Sasai, Otsu (Japan) | ||
| Assigned to Toyo Boseki Kabushiki Kaisha, Osaka-shi (Japan) | ||
| Appl. No. 10/503,926 PCT Filed Feb. 03, 2003, PCT No. PCT/JP03/01080 § 371(c)(1), (2), (4) Date Aug. 10, 2004, PCT Pub. No. WO03/068853, PCT Pub. Date Aug. 21, 2003. |
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| Claims priority of application No. 2002-038891 (JP), filed on Feb. 15, 2002; application No. 2002-113684 (JP), filed on Apr. 16, 2002; application No. 2002-293968 (JP), filed on Oct. 07, 2002; application No. 2002-293969 (JP), filed on Oct. 07, 2002; application No. 2002-293970 (JP), filed on Oct. 07, 2002; and application No. 2002-303288 (JP), filed on Oct. 17, 2002. | ||
| Prior Publication US 2005/0095486 A1, May 05, 2005 | ||
| Int. Cl. H01M 8/10 (2006.01) | ||
| U.S. Cl. 429—33 [429/44; 428/308.4] | 15 Claims |
| 1. A composite ion exchange membrane including a composite layer comprising a support membrane with continuous voids formed
of polybenzazole polymer, the support layer 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,
wherein the thickness of the composite layer accounts for from 5% to 95% of the total thickness of the composite ion exchange
membrane,
wherein each of the surface layers has a thickness of from 1 μm to 50 μm and does not exceed half the total thickness of the
composite ion exchange membrane, and further
wherein the porosity of the support membrane is 90% by volume or more.
|