Manufacturing method for low molecular weight polytetrafluoroethylene, and powder
US11028239B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2019 |
| Grant date | Jun 8, 2021 |
| Priority date | — |
| Expiry date | Feb 5, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Provided is a method for producing low molecular weight polytetrafluoroethylene less likely to generate C6-C14 perfluorocarboxylic acids and salts thereof. The method for producing low molecular weight polytetrafluoroethylene includes: (1) feeding into an airtight container: high molecular weight polytetrafluoroethylene: and a gas mixture containing an inert gas and oxygen and having an oxygen content relative to the total of the inert gas and oxygen of 1 to 10 vol %; and (2) irradiating the high molecular weight polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a melt viscosity at 380° C. of 1.0×102 to 7.0×105 Pa·s.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.