Agc Inc.

Asahi Glass Company, Limited

Yukiko Hattori

Takehiro Kose

Takeshi Yamada

Shigeru Aida

Kazuo Umemura

Atsushi Tsuji

Shintaro Fukunaga

Toshinori Tomita

Shinya Higuchi

Hiroki Nagai

Mizuna Toyoda

Satoko Yasuda

Keisuke Yagi

Toshikazu Yoneda

Tsuyoshi Kawai

Junko Anzai

Akira Onodera

Kosuke Shibasaki

A method for producing a fluorinated polymer which does not require an emulsifier as an essential component while an aqueous medium with little environmental burden is used. A method for producing a fluorinated polymer, which includes polymerizing a fluorinated monomer selected from tetrafluoroethylene, chlorotrifluoroethylene and vinylidene fluoride, in an aqueous medium in the presence of a first polymer having units based on a compound represented by formula (1): CXY═CR-L-R.

Method for producing fluorine-containing polymer, aqueous dispersion liquid, and fluorine-containing polymer composition

To provide a method for producing crosslinked rubber excellent in hardness and transparency. The method for producing crosslinked rubber of the present invention is a method for producing crosslinked rubber, which comprises crosslinking a fluorinated copolymer in a composition comprising the fluorinated copolymer, a crosslinking agent and a crosslinking co-agent, wherein the fluorinated copolymer is a copolymer having units based on tetrafluoroethylene and units based on a perfluoro(alkyl vinyl ether), the content of the units based on tetrafluoroethylene is from 65 to 90 mol % to all units of the fluorinated copolymer, in the composition, the content of the crosslinking agent is from 0.03 to 0.7 part by mass to 100 parts by mass of the fluorinated copolymer, the content of the crosslinking co-agent is from 0.1 to 2.5 parts by mass to 100 parts by mass of the fluorinated copolymer, and the hardness is from 65 to 100.

Fluorinated copolymer composition, crosslinked rubber and method for its production

To provide a fluorinated elastic copolymer and a fluorinated elastic copolymer composition, whereby it is possible to obtain a crosslinked rubber article which has practically sufficient rubber physical properties and which is, at the same time, excellent in low-temperature characteristics; a crosslinked rubber article; and a method for producing a fluorinated elastic copolymer. The fluorinated elastic copolymer comprises units based on tetrafluoroethylene, units based on CF&#x2550;CFOR(Ris a Cperfluoroalkyl group), units based on CF&#x2550;CF(OCFCF)&#x2014;(OCF)&#x2014;OR(Ris a Cperfluoroalkyl group, n is an integer of from 0 to 3, m is an integer of from 0 to 4, and n+m is an integer of from 1 to 7), and units based on a fluorinated monomer having at least two polymerizable unsaturated bonds.

Fluorinated elastic copolymer, its composition and crosslinked rubber article

To provide a fluorinated elastic copolymer excellent in adhesion, processability, mechanical properties, heat resistance and chemical resistance. A fluorinated elastic copolymer having units based on a monomer (a), units based on a monomer (b) and optionally units based on a monomer (c), which has an iodine atom bonded to a terminal of a molecular chain and the unit based on the monomer (b) adjacent to the iodine atom, and which has a proportion of the units based on the monomer (b) of from 0.09 to 2.0 mol % to all units. Monomer (a): monomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, chlorotrifluoroethylene, a perfluoro(alkyl vinyl ether) and 2,3,3,3-tetrafluoropropene; monomer (b): a monomer having at least one type of functional group selected from the group consisting of an epoxy group, a hydroxy group, a carbonyl group-containing group and an isocyanate group; monomer (c): a monomer selected from the group consisting of ethylene and propylene.

Fluorinated elastic copolymer, and method for producing fluorinated elastic copolymer

To provide a fluorinated elastic copolymer having a low content of metal elements and being excellent in crosslinkability. This fluorinated elastic copolymer has iodine atoms and has units a based on tetrafluoroethylene, units b based on a monomer having one polymerizable unsaturated bond (but excluding tetrafluoroethylene), and units c based on a fluorinated monomer having at least two polymerizable unsaturated bonds, wherein the metal content is at least 0.3 ppm by mass and at most 20.0 ppm by mass.

Fluorinated elastic copolymer and method for its production, fluorinated elastic copolymer composition, and crosslinked rubber article

To provide a perfluoroelastomer, which is excellent in low temperature properties, which does not lose value as a rubber and which is free from a decrease of the productivity, a perfluoroelastomer composition, a crosslinked rubber product, and a method for producing a perfluoroelastomer. A perfluoroelastomer comprising structural units (a) derived from tetrafluoroethylene, structural units (b) derived from a perfluoroalkyl vinyl ether represented by the formula (1) (such as perfluoromethyl vinyl ether) and structural units (c) derived from a perfluorooxaalkyl vinyl ether represented by the formula (2) (such as CF&#x2550;CFOCFCFOCFCFOCFCF).

Perfluoroelastomer, perfluoroelastomer composition, crosslinked rubber product, and method for manufacturing perfluoroelastomer

Provided is a process for producing a fluorinated copolymer which is capable of providing an ion exchange membrane which can suppress a decrease in current efficiency by impurities in an aqueous alkali chloride solution as a raw material on electrolysis of the alkali chloride aqueous solution. Also provided is a process for producing a fluorinated copolymer that comprises washing a fluorinated copolymer comprising a fluorinated monomer having a carboxylic acid type functional group and a fluorinated olefin, with a washing solvent containing a fluorinated solvent at a temperature of at least 40&#xb0; C. and at most a boiling point of the washing solvent.

Process for producing fluorinated copolymer

To provide a fluorinated copolymer which is capable of providing an ion exchange membrane having little adverse effect due to impurities in an alkali chloride aqueous solution on electrolysis of the alkali chloride aqueous solution. To use a fluorinated copolymer of a fluorinated monomer having a carboxylic acid type functional group with a fluorinated olefin, wherein the proportion of components having a common logarithm (log M) of a molecular weight M being from 2.0 to 3.5 is at most 10 mass % per 100 mass % of components having a common logarithm (log M) of a molecular weight M being at least 2.0, contained in a CClFCFCClFH soluble content.

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Chiyoda-ku, Japan

Yukiko Hattori