Method of converting fluorine-containing polymer into lower molecular weight polymer
US4908415A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1987 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | Dec 2, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/50
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A fluoropolymer, e.g. polytetrafluoroethylene, is easily and efficiently converted into a lower molecular weight polymer in the form of a fine powder by subjecting the fluoropolymer to contact reaction with a gas comprising molecular fluorine or a suitable fluoride such as nitrogen trifluoride or xenon difluoride at a temperature between the melting temperature of the fluoropolymer and 600.degree. C., extracting a hot reaction gas produced by the contact reaction from the reactor and cooling the extracted reaction gas to a temperature not high than 100.degree. C. to thereby precipitate the molecular weight reduced fluoropolymer contained in the hot reaction gas as vapor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.