Method for producing polytetrafluoroethylene fine powder
US8575287B2 · kind B2 · utility
1Cited by
2References
10Claims
0Family size
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Key dates
| Filing date | Oct 25, 2010 |
| Grant date | Nov 5, 2013 |
| Priority date | — |
| Expiry date | Sep 4, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
To provide a method for producing a PTFE fine powder having a low paste extrusion pressure property by a simple method. The method for producing a PTFE fine power comprises emulsion polymerizing tetrafluoroethylene in the presence of an aqueous medium, a fluorinated surfactant and a radical polymerization initiator, to produce an aqueous PTFE emulsion, and coagulating it in the presence of at least one bulk density-reducing compound selected from the group consisting of ammonia, an ammonium salt and urea in an amount of from 0.4 to 10 parts by mass per 100 parts by mass of PTFE.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.