Method for manufacturing fine polytetrafluoroethylene powder
US9006333B2 · kind B2 · utility
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3Claims
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Key dates
| Filing date | Sep 29, 2011 |
| Grant date | Apr 14, 2015 |
| Priority date | — |
| Expiry date | Sep 29, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for manufacturing a polytetrafluoroethylene fine powder characterized by including the steps of (1) preparing an aqueous dispersion containing polytetrafluoroethylene, water, and a surfactant (A); (2) coagulating the polytetrafluoroethylene in the aqueous dispersion by agitating the aqueous dispersion with a discharge flow-type impeller; (3) collecting a wet powder of the polytetrafluoroethylene; and (4) drying the wet powder of the polytetrafluoroethylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.