Asahi Glass Company, Limited

Junko Haga

Yasuhiko Matsuoka

Jun Hoshikawa

To provide a method for recovering an anionic fluorinated emulsifier, capable of easily and efficiently recovering an anionic fluorinated emulsifier adsorbed on a basic ion exchange resin. A basic ion exchange resin is brought into contact with a mixture of an aqueous inorganic acid solution and a non-aqueous fluorinated medium, or the basic ion exchange resin is brought into contact with an aqueous inorganic acid solution and then brought into contact with a non-aqueous fluorinated medium, then a phase of the non-aqueous fluorinated medium is recovered, and an acid of the anionic fluorinated emulsifier is recovered from the phase of the non-aqueous fluorinated medium.

Method for recovering anionic fluorinated emulsifier

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 m/g, to an aqueous PTFE dispersion containing both PTFE microparticles, having an average particle size of from 0.10 to 0.50 &#x3bc;m, 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 &#x3bc;m and from 1.4 to 2.1 mass %, based on the mass of the PTFE microparticles, of a nonionic surfactant.

Process for producing aqueous polytetrafluoroethylene dispersion for coagulation processing, and aqueous polytetrafluoroethylene dispersion for coagulation processing

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Tokyo, Japan

Junko Haga