Perfluoropolyethers containing a halogen different from fluorine and having an acid end group
US5143589A · kind A · utility
5Cited by
7References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1991 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | Jan 29, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/3312
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Perfluoropolyethers having an acid end group of the type of acyl fluoride (or chloride) or a carboxylic group or derivatives thereof, the other end group being a perfluoroalkyl containing one or two halogen atoms different from fluorine, are prepared by photooxidation of C.sub.3 F.sub.6 and/or C.sub.2 F.sub.4, in the presence of a fully halogenated ethylene containing 1 to 4, preferably 1 or 2 atoms of halogen different from fluorine, and by the subsequent thermal of photochemical decomposition treatment of the peroxide groups which are present in the photooxidation product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.