Method for producing low-molecular weight polytetrafluoroethylene, and powder
US12227608B2 · kind B2 · utility
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Key dates
| Filing date | Jan 7, 2022 |
| Grant date | Feb 18, 2025 |
| Priority date | — |
| Expiry date | Aug 13, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F114/26
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for producing low-molecular-weight polytetrafluoroethylene which includes: (1) irradiating high-molecular-weight polytetrafluoroethylene with radiation to a dose of 250 kGy or higher substantially in the absence of oxygen to provide low-molecular-weight polytetrafluoroethylene having a melt viscosity at 380° C. of 1.0×102 to 7.0×105 Pa·s. Also disclosed is a powder containing the low-molecular-weight polytetrafluoroethylene, the powder being substantially free from any of perfluorooctanoic acid and salts thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.