Daikin Industries, Ltd.

Kazuhiro Mishima

Taku Yamanaka

Yasuhiko Sawada

Takahiro Taira

Chiaki Okui

Masayoshi Miyamoto

Kazuhiko Shimada

Toshinari Tanaka

Yuuji Tanaka

Taketo Kato

Hirotoshi Yoshida

Takayuki Tanaka

Tadao Hayashi

A method for producing an aqueous dispersion of purified polytetrafluoroethylene, the method including: removing or reducing a compound represented by Formula (1) or (2) below from an aqueous dispersion of polytetrafluoroethylene obtained using a hydrocarbon surfactant:(H—(CF)—COO)M; or  Formula (1):(H—(CF)—SO)M.  Formula (2): Also disclosed is a composition containing polytetrafluoroethylene substantially free from a compound represented by Formula (3) below and a molded body including the composition:(H—(CF)—SO)M.  Formula (3):

Method for producing purified polytetrafluoroethylene aqueous dispersion liquid, method for producing modified polytetrafluoroethylene powder, method for producing polytetrafluoroethylene molded body, and composition

A method for producing a polytetrafluoroethylene powder, which includes applying an ultrasonic wave to a polytetrafluoroethylene aqueous dispersion containing polytetrafluoroethylene particles to coagulate the polytetrafluoroethylene particles.

Method for producing polytetrafluoroethylene powder

A process for preparing ground resin particles is provided by modifying a jet mill with opposed fluidized bed. By using a jet mill having a plurality of jet nozzles disposed at predetermined positions in a barrel of a grinding chamber toward the injection point of the grinding chamber and a bottom wall having a flat surface in part or in whole, parallel to the jet nozzles, or having a conical projection immediately below the injection point, resin particles to be ground are jetted with or without water, thereby being ground to obtain ground resin particles of an intended particle size.

Process for preparing ground resin particles and apparatus for preparing the same

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Settsu, Japan

Kazuhiro Mishima