Sulphonic fluorinated ionomers
US6706834B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2001 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Jan 12, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Sulphonic fluorinated ionomers crosslinked by radical crosslinking of:A) crosslinkable sulphonic fluorinated ionomers, having equivalent weight 380-1300 g/eq and comprising: from 48% to 85% by moles of monomeric units deriving from tetrafluoroethylene (TFE);from 15% to 47% by moles of fluorinated monomeric units containing sulphonyl groups —SO2F; from 0.01% to 5% by moles of monomeric units deriving from a bis-olefin of formula: wherein: m=2-10, preferably 4-8; R1, R2, R5, R6, equal to or different from each other, are H or C1-C5 alkyl groups;B) a fluorinated compound as crosslinking radical initiator;C) a fluorinated bis-olefin of structure (I) as crosslinking agent;the radical crosslinking being carried out at a temperature in the range 250° C.-310° C., preferably 260° C.-300° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.