Daikin Industries, Ltd.

Tatsuo Suzuki

Tomohiro Isogai

Takahisa Aoyama

Tetsuo Shimizu

Ken Okanishi

Katsuya Nakai

Taku Hirakawa

Hiroyuki Shimada

Minoru Yoshida

Masahiro Kondo

Tadashi Ino

The present invention is aimed to provide a highly-productive method for producing a stabilized fluoropolymer. The present invention relates to a method for producing a stabilized fluoropolymer, comprising the step of bringing a fluoropolymer to be treated into contact with a fluorinating agent to produce a stabilized fluoropolymer, while maintaining the concentration of hydrogen fluoride present in a reaction vessel at not higher than 1.0% by volume.

Method for producing stabilized fluoropolymer

A particulate material processing apparatus has a vessel and a processing tank. The vessel has a charging port for charging a particulate material into the vessel. The processing tank receives the particulate material charged from the charging port. The processing tank is shaped so as to narrow towards the bottom. At least the lower part of the processing tank is made of a gas-permeable material that allows the process gas for processing the particulate material to pass through. The upper part of the processing tank has lower gas permeability than the lower part of the processing tank.

Particulate material processing apparatus and particulate material processing system

A particulate material processing apparatus has a vessel, a processing tank, and a dispersing member. The vessel has a charging port for charging a particulate material into the vessel. The processing tank receives the particulate material charged from the charging port. The processing tank is shaped so as to narrow towards the bottom. At least the lower part of the processing tank is made of a gas-permeable material that allows the process gas for processing the particulate material to pass through. The dispersing member is disposed below the charging port. The dispersing member disperses and flattens the particulate material on the processing tank.

It is an object of the present invention to provide a novel method for producing a fluoropolymer according to which unstable terminal groups can be sufficiently stabilized under mild conditions. This invention is related to a method for producing a stabilized fluoropolymer comprising subjecting a fluoropolymer to be treated containing no &#x2014;SOX (X representing F or Cl) group-containing monomer units to the following step A, step B and step C in that order:

Spherulites in a molded article obtained from a melt-processable crystalline fluorine-containing resin composition are minimized to give the transparent molded article having a smooth surface and being resistant to contamination. An agent for minimizing spherulite size which comprises an amorphous fluorine-containing polymer or a fluorine-containing multi-segment polymer. The fluorine-containing multi-segment polymer comprises an amorphous segment and a crystalline segment.

Spherulite-micronizing agent for crystalline fluororesin crystalline fluororesin composition containing micronizing agent

Agent for minimizing size of spherulite of crystalline fluorine-containing resin and crystalline resin and crystalline fluorine-containing resin composition comprising said agent

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Settsu, Japan

Tatsuo Suzuki