| US 7,455,934 B1 | ||
| Fluorocopolymer material with sulfonic acid functional groups as a solid polyelectrolyte for use in fuel cells | ||
| Takayuki Araki, Settsu (Japan); Noritoshi Oka, Settsu (Japan); Yoshito Tanaka, Settsu (Japan); Takayuki Nakamura, Settsu (Japan); and Tetsuo Shimizu, Settsu (Japan) | ||
| Assigned to Daikin Industries, Ltd., Osaka (Japan) | ||
| Appl. No. 9/700,185 PCT Filed May 10, 1999, PCT No. PCT/JP99/02398 § 371(c)(1), (2), (4) Date Dec. 18, 2000, PCT Pub. No. WO99/59216, PCT Pub. Date Nov. 18, 1999. |
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| Claims priority of application No. 10-130421 (JP), filed on May 13, 1998. | ||
| Int. Cl. H01M 10/08 (2006.01) | ||
| U.S. Cl. 429—309 [429/314; 429/317; 521/28; 427/384; 204/252] | 7 Claims |
| 1. A material for a solid polyelectrolyte, comprising a multi-segmented fluoropolymer that comprises a block copolymer and/or
a graft copolymer,
wherein the copolymer contains one or more blocks essentially consisting of segment A and one or more blocks essentially consisting
of segment B, the segment A combines with the segment B,
wherein the segment A has a molecular weight of 5,000 to 1,000,000, and the Segment A is a copolymer chain comprising:
(a) an ethylenic fluoromonomer containing sulfonic acid functional groups each represented by Formula (1)
CX2═CX1—(O)n—Rf—SO2Y (1)
wherein X and X1 may be the same or different and are each hydrogen or fluorine; Y is F, Cl, or OY1 wherein Y1 is hydrogen, alkali metal or C1 to C5 alkyl; Rf is C1 to C40 divalent fluoroalkylene or C1 to C40 divalent fluoroalkylene having one or more ether bonds; and n is 0 or 1; and
(b) at least one type of ethylenic fluoromonomer copolymerizable with the ethylenic fluoromonomer (a) and containing no sulfonic
acid functional groups,
the segment B is a fluoropolymer containing no sulfonic acid functional groups, has a molecular weight of 3,000 to 1,200,000,
and has a crystalline melting point of 100° C. or higher or a glass transition point of 100° C. or higher,
wherein the ratio of segment A:segment B in the segmented fluoropolymer is 30:70 to 90:10 wt. %.
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