Asahi Glass Company, Limited

Agc Inc.

Kazuo Hamazaki

Tetsuji Shimohira

Seigo Kotera

Susumu Saito

Satoru Hommura

Shigeru Aida

Kazuo Kato

Haruhisa Miyake

Atsushi Funaki

Ichiro Terada

Teruo Takakura

Daisuke Taguchi

Mizuna Toyoda

Masakazu Ataku

Ken Iruya

Satoshi Otsugu

Wakako Hashimoto

Hiroki Matoba

A method for producing particles of a fluorinated polymer (A) which has either one or both of structural units (u1) derived from tetrafluoroethylene and structural units (u2) having no sulfonic acid type functional group and having a cyclic structure and fluorine atoms, and which has structural units (u3) having a sulfonic acid type functional group, wherein the proportion of the structural units (u1) is from 0 to 82 mol % in all structural units in the fluorinated polymer (A), the method including:

Method for producing fluorinated polymer particles

A method for producing a fluorinated polymer, which comprises carrying out polymerization in a container capable of polymerizing a monomer in a pressurized state, in the presence of at least one of specific four organic peroxides, in a polymerization medium containing at least one fluorinated solvent (B) having a boiling point at normal pressure of at most 60&#xb0; C., using at least a fluorinated monomer (C) having a boiling point at normal pressure higher than said fluorinated solvent (B), and tetrafluoroethylene, at a temperature of at most 70&#xb0; C. and at least the boiling point at normal pressure of a fluorinated solvent (B) having the lowest boiling point at normal pressure among said fluorinated solvent (B).

Method for producing fluorinated polymer

To provide an optical member having an excellent transparency and heat resistance and further having favorable light resistance as compared with a molded product made of a conventional ethylene/tetrafluoroethylene copolymer, a process for producing the same, and an article provided with the optical member. An optical member made of a molded product containing a crosslinked product of an ethylene/tetrafluoroethylene copolymer comprising units (A) based on tetrafluoroethylene, units (B) based on ethylene and units (C) based on CH&#x2550;CH&#x2014;CF(wherein n is an integer of from 2 to 10), wherein the molar ratio ((A)/(B)) of the above units (A) to the above units (B) is from 50/50 to 66/34, and the molar ratio ((C)/{(A)+(B)}) of the above units (C) to the sum of the above units (A) and the above units (B) is from 4.0/100 to 10/100.

Optical member, process for producing same, and article provided with optical member

To provide a method for recovering an anionic fluorinated emulsifier, whereby an anionic fluorinated emulsifier adsorbed on a basic ion exchange resin can be simply and efficiently recovered. A mixed liquid of an aqueous inorganic acid solution, a fluorinated medium and a non-fluorinated medium, is contacted to a basic ion exchange resin having an anionic fluorinated emulsifier adsorbed thereon, to recover a liquid phase containing the fluorinated medium, or an aqueous inorganic acid solution is contacted to a basic ion exchange resin having an anionic fluorinated emulsifier adsorbed thereon, then a mixed liquid of a fluorinated medium and a non-fluorinated medium is contacted thereto, and thereafter the basic ion exchange resin and a liquid phase are separated to recover the liquid phase, whereupon from each liquid phase, an acid of the anionic fluorinated emulsifier is recovered.

Method for recovering anionic fluorinated emulsifier

To obtain a nonwoven fabric which is excellent in the heat resistance and the chemical resistance, of which the fiber diameter is small, and which is excellent in the mechanical strength at a temperature at which it is used; and an electrolyte membrane which is excellent in the dimensional stability when it is swollen by water, and of which an increase in the resistance by a reinforcing material is suppressed. A nonwoven fabriccontaining fibersof an ethylene/tetrafluoroethylene copolymer having a storage elastic modulus E' at 25&#xb0; C. of at least 8&#xd7;10Pa and a melt viscosity measured at 300&#xb0; C. of higher than 60 Pa&#xb7;s and at most 300 Pa&#xb7;s, wherein the average fiber diameter of the fibers is from 0.01 to 3 &#x3bc;m; and an electrolyte membrane reinforced by the nonwoven fabric

Nonwoven fabric and electrolyte membrane

A polymer electrolyte membrane made of a polymer has a low electrical resistance, high heat resistance and is strong against repeats of swelling and shrinkage. Thus, a membrane/electrode assembly for polymer electrolyte fuel cells having high power generation performance and excellent in durability can be provided. For a polymer electrolyte membraneor for a catalyst layerconstituting electrodesand, a polymer comprising units (U1) and units (U2) is used: Q, Q: a perfluoroalkylene group which may have &#x2014;O&#x2014; or the like; R, R: a perfluoroalkyl group which may have &#x2014;O&#x2014;; X: an oxygen atom or the like; a: 0 or the like; Y, Z: a fluorine atom, or a monovalent perfluoroorganic group such as &#x2014;CF; S: 0 to 1; and t: 0 to 3.

Polymer, polymer electrolyte membrane for polymer electrolyte fuel cell, and membrane/electrode assembly

A polymer electrolyte membrane made of a polymer having a low electrical resistance, high heat resistance and is strong against repeats of swelling and shrinkage. Thus, a membrane/electrode assembly for polymer electrolyte fuel cells having high power generation performance and excellent in durability can be provided. The polymer has repeating units represented by the following formula (U1 ) and repeating units represented by the following formula (U2): 

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Tokyo, Japan

Kazuo Hamazaki