Perfluoropolyoxyalkylene endowed with a high viscosity and a low peroxide oxygen content, and process for preparing them
US5354922A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1992 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Apr 22, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/682
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Peroxy perfluoropolyoxyalkylenes are prepared with high yields by carrying out the photo-oxidation of tetrafluoroethylene with molecular oxygen, by means of ultraviolet radiations, operating in the presence of pentafluorochloroethane as a solvent for tetrafluoroethylene. Thus, it is possible to obtain peroxy perfluoropolyoxyalkylenes having a viscosity at 20.degree. C. ranging from 300,000 to 8,000,000 cSt and endowed with a peroxide content not higher than 4. Such perfluoropolyoxyalkylenes provide, through chemical reduction, perfluoropolyoxyalkylenes endowed with a functionality higher than 1.9 and at the same time with a high molecular weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.