Asahi Glass Company, Limited

Mitsuru Seki

Takehiro Kose

Hiroshi Funaki

Masayuki Saito

Hiroki Kamiya

Yasuhiko Matsuoka

Masao Iwaya

Masahide Yodogawa

Mizuna Toyoda

Jumpei Nomura

Go Mizuno

Toshikazu Yoneda

A method for producing a binder composition for a storage battery device, which comprises an emulsion polymerization step of emulsion polymerizing a monomer mixture containing a fluorinated vinyl monomer in the presence of a first anionic emulsifying agent (A), an aqueous medium and a radical polymerization initiator to obtain a latex containing a fluorinated polymer, and a post addition step of adding a second anionic emulsifying agent (B) to the latex. The first anionic emulsifying agent (A) has no phenyl group in its molecule, and the second anionic emulsifying agent (B) has a phenyl group in its molecule.

Method for producing binder composition for storage battery device

To provide a positive electrode material mixture for a non-aqueous secondary battery, which is less likely to be gelled and has a good applicability to a current collector, and is capable of producing a battery capable of sufficiently exhibiting practical performance. A positive electrode material mixture which comprises a cathode active material, a binder containing a fluorinated copolymer having polymerized units derived from tetrafluoroethylene and polymerized units derived from propylene, and an aqueous medium, wherein the cathode active material is that the pH of a supernatant obtained by mixing the cathode active material with water is at least 10, and a positive electrode and a secondary battery, obtainable by employing it.

Positive electrode material mixture, and positive electrode for non-aqueous secondary battery and secondary battery, employing it

To provide a fluorinated elastic copolymer which is excellent in crosslinking reactivity and extrusion moldability and which is curable to obtain a rubber excellent in permanent compression set resistance, base resistance and oil resistance and particularly suitable as a covering material for electric wires. A fluorinated elastic copolymer obtained by copolymerizing tetrafluoroethylene, propylene and optionally another monomer, wherein the molar ratio (a)/(b) of repeating units (a) derived from tetrafluoroethylene to repeating units (b) derived from propylene in the fluorinated elastic copolymer is from 60/40 to 75/25, and repeating units (c) derived from said another monomer is from 0 to 10 mol % in the fluorinated elastic copolymer.

Fluorinated elastic copolymer and method for its production

To provide a fluorinated elastic copolymer composition, and a cross-linked rubber member obtained by crosslinking the fluorinated elastic copolymer composition, which is excellent in hot water resistance and steam resistance under severe conditions. A fluorinated elastic copolymer composition, which comprises a fluorinated elastic copolymer and a compound represented by the following formula (1) wherein the compound represented by the following formula (1) is contained in an amount of from 0.1 to 10 parts by mass per 100 parts by mass of the fluorinated elastic copolymer:(RCOO)M&#x2003;&#x2003;(1)(wherein R is a Corganic group, n is an integer of 2 or 3, and M is an alkaline earth metal, Zn, Cd, Co, Sn, Cu, Pb, Ni or Al).

Fluorinated elastic copolymer composition and its cross-linked rubber member

To provide a fluorinated elastic copolymer having high crosslinkability, having high flowability and excellent in the compression set and the resistance to bases, and its production process. A process for producing a fluorinated elastic copolymer, which comprises copolymerizing (a) tetrafluoroethylene and (b) propylene and as the case requires, (c) a perfluoro(alkyl vinyl ether) in the presence of an iodine compound represented by the formula RI(wherein R is a hydrocarbon group or perfluoroalkyl group having at least 3 carbon atoms) at a temperature of from 0&#xb0; C. to 50&#xb0; C., and a fluorinated elastic copolymer obtained by the production process.

Fluorinated elastic copolymer and production process

The present invention provides a fluorinated polymer excellent in the crosslinking reactivity, crosslinked rubber physical properties and chemical resistance, and its crosslinked rubber. A fluorinated polymer comprising repeating units (a) based on at least one monomer selected from the group consisting of ethylenic unsaturated compounds each having a hydroxyphenyl group, repeating units (b) based on at least one fluoromonomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, 3,3,3-trifluoropropene, 1,3,3,3-tetrafluoropropene, 1,1,2-trifluoroethylene, vinyl fluoride, 1,2-difluoroethylene and CF&#x2550;CF&#x2014;O&#x2014;R(wherein Ris a Csaturated perfluoroalkyl group or a perfluoro(alkoxyalkyl) group) and, if necessary, repeating units (c) based on at least one hydrocarbon monomer selected from the group consisting of ethylene, propylene and CH&#x2550;CH&#x2014;O&#x2014;R.

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Tokyo, Japan

Mitsuru Seki