Method for producing low molecular weight polytetrafluoroethylene, low molecular weight polytetrafluoroethylene, and powder
US10538605B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2017 |
| Grant date | Jan 21, 2020 |
| Priority date | — |
| Expiry date | Aug 4, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for producing low molecular weight polytetrafluoroethylene less likely to generate C8-C14 perfluorocarboxylic acids and salts thereof. The method includes: (1) feeding into an airtight container: polytetrafluoroethylene; at least one additive selected from the group consisting of hydrocarbons, chlorinated hydrocarbons, alcohols, and carboxylic acids other than C8-C14 perfluorocarboxylic acids; and at least one selected from the group consisting of inert gases other than the above additive and oxygen adsorbents; and (2) irradiating the polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a complex viscosity of 1×102 to 7×105 Pa·s at 380° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.