Process for producing aqueous polytetrafluoroethylene dispersion for coagulation processing, and aqueous polytetrafluoroethylene dispersion for coagulation processing
US8461230B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 2012 |
| Grant date | Jun 11, 2013 |
| Priority date | — |
| Expiry date | Feb 10, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention provide an aqueous PTFE dispersion and a process for efficiently producing the aqueous PTFE dispersion for coagulation processing having excellent coagulation properties of PTFE microparticles. The process involves adding a synthetic adsorbent, having a specific surface area of from 100 to 2,000 m2/g, to an aqueous PTFE dispersion containing both PTFE microparticles, having an average particle size of from 0.10 to 0.50 μm, and a nonionic surfactant, followed by stirring or shaking and then separation into a liquid phase and a solid phase, and recovering an aqueous PTFE dispersion which contains from 45 to 70 mass % of PTFE microparticles having an average particle size of from 0.10 to 0.50 μm and from 1.4 to 2.1 mass %, based on the mass of the PTFE microparticles, of a nonionic surfactant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.