Method for preparing poly(2,5-benzimidazole)
US7388035B2 · kind B2 · utility
21Cited by
2References
13Claims
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Key dates
| Filing date | Oct 26, 2004 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | May 25, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for preparing poly(2,5-benzimidazole) whereby 3,4-diaminobenzoic acid is polymerized using a dehydrating reagent containing P2O5 and CX3SO3H where X is H or F. The poly(2,5-benzimidazole) has good proton conductivity and low methanol permeability, and therefore can be used as a polymer electrolyte membrane for a fuel cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.