Preparation of sulphonic fluorinated polymer solutions
US6197903A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1999 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Mar 31, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for preparing a solution and/or dispersion containing sulphonic (per)fluorinated ionomers having --SO.sub.3 M functional groups, wherein M is selected from H, Li, Na, K, NR.sub.4 (R equal to or different from each other are selected from H, CH.sub.3, C.sub.2 H.sub.5), characterized in that it dissolves the above defined ionomers at a temperature comprised between the room temperature and about 150.degree. C., in a monophasic ternary mixture essentially constituted by water, by a C.sub.1 -C.sub.4 alcohol and by a fluoro(poly)oxyalkylene having one hydrogen atom in at least a fluorinated end group; the dispersed polymer particle sizes are in the range 30-100 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.