Agc Inc.

Asahi Glass Company, Limited

Sumitomo Chemical Company, Limited

Chikaya Tamitsuji

Daisuke Jomuta

Takeshi Hirai

Kunio Watanabe

Susumu Saito

Akio Koike

Takumi Okuyama

Daisuke Kobayashi

Naoki Yoshida

Hiroyuki Watabe

Nobuyuki Otozawa

Tomonori Ogawa

Yusuke Takahira

Kaname Okada

Widjaja Hardiyanto

Sadatatsu Ikeda

Seiji Higashi

To provide a perfluoropolymer capable of producing an electrolyte membrane excellent in electrical conductivity and mechanical strength under high temperature environment, as well as a liquid composition, a polymer electrolyte membrane, a membrane electrode assembly and a polymer electrolyte fuel cell, obtainable by using the perfluoropolymer. The perfluoropolymer of the present invention contains perfluoromonomer units, does not substantially contain units having a halogen atom other than a fluorine atom, does not substantially contain units having a ring structure, and has acid-type sulfonic acid groups, wherein the perfluoromonomer units contain at least one type of units A selected from the group consisting of perfluoro vinyl ether units and perfluoro allyl ether units; the ion exchange capacity is from 1.4 to 2.5 milliequivalent/gram dry resin; and the storage modulus at 120° C. is at least 60 MPa.

Perfluoropolymer, liquid composition, polymer electrolyte membrane, membrane electrode assembly and polymer electrolyte fuel cell

A method for producing a fluorosulfonyl group-containing compound to obtain a compound represented by the following formula 5 from a compound represented by the following formula 1 as a starting material and a method for producing a fluorosulfonyl group-containing monomer in which the fluorosulfonyl group-containing compound is used: wherein Rand Rare a Calkylene group, and Rand Rare a Cperfluoroalkylene group.

Fluorosulfonyl group-containing compound, fluorosulfonyl group-containing monomer, and their production methods

To provide a polymer wherein a linking group that connects the main chain of the polymer and a cyclic perfluoroaliphatic disulfonimide skeleton, is a fluoroalkylene group which may have an ether oxygen atom. A polymer which has either one or both of units represented by formula u1-1 and units represented by formula u1-2: R, R: a Cperfluoroalkylene group; R: a Cperfluoroalkylene group; m: 0 or 1; and X: a hydrogen atom, an alkali metal atom, a fluorine atom, an alkyl group, ammonium or the like.

Polymer, method for producing polymer, and method for producing membrane

To provide a liquid composition capable of forming a membrane excellent in durability against hydrogen peroxide or peroxide radicals and excellent in hydrogen gas barrier property; a polymer electrolyte membrane; a membrane electrode assembly; and a polymer electrolyte fuel cell. Liquid composition comprising a liquid medium, an acid-type sulfonic acid group-containing fluorocarbon polymer of which the hydrogen gas permeation coefficient under the conditions of a temperature of 80° C. and a relative humidity of 10% is at most 2.5×10cm·cm/(s·cm·cmHg), and cerium atoms; a polymer electrolyte membranecomprising the acid-type sulfonic acid group-containing fluorocarbon polymer, and cerium atoms; and a membrane electrode assemblycomprising an anodehaving a catalyst layer, a cathodehaving a catalyst layer, and the polymer electrolyte membranedisposed between the anodeand the cathode

Liquid composition, polymer electrolyte membrane, membrane electrode assembly and polymer electrolyte fuel cell

An acid-type sulfonic acid group-containing polymer containing perfluoromonomer units, no monomer units having a halogen atom other than a fluorine atom, and acid type sulfonic acid groups, whose hydrogen gas permeability coefficient under the conditions of a temperature of 80° C. and a relative humidity of 10% is at most 2.5×10cm·cm/(s·cm·cmHg), and whose mass reduction rate when immersed in hot water at 120° C. for 24 hours is at most 15 mass %. Liquid composition, membrane electrode assembly, polymer electrolyte fuel cell, and ion exchange membrane utilizing the acid-type sulfonic acid group-containing polymer.

Acid-type sulfonic acid group-containing polymer, liquid composition, polymer electrolyte membrane, membrane electrode assembly, polymer electrolyte fuel cell and ion exchange membrane for water electrolysis

To provide a perfluoropolymer capable of producing an electrolyte membrane excellent in mechanical strength in high temperature environments; as well as a liquid composition, polymer electrolyte membrane, membrane electrode assembly and polymer electrolyte water electrolyzer, obtainable by using the perfluoropolymer. The perfluoropolymer of the present invention contains perfluoromonomer units, does not substantially contain units having a halogen atom other than a fluorine atom, does not substantially contain units having a ring structure, and has acid-type sulfonic acid groups, wherein the perfluoromonomer units contain at least one type of units A selected from the group consisting of perfluorovinyl ether units and perfluoroallyl ether units; the ion exchange capacity is from 0.9 to 1.4 milliequivalent/gram dry resin; and the storage modulus at 120&#xb0; C. is at least 100 MPa.

Perfluoropolymer, liquid composition, polymer electrolyte membrane, membrane electrode assembly and polymer electrolyte water electrolyzer

A fluorosulfonyl group-containing polymer having units represented by the following formula u1, a sulfonic acid group-containing polymer having fluorosulfonyl groups in the fluorosulfonyl group-containing polymer converted into sulfonic acid groups, its production method and its applications: wherein Rand Rare a Cperfluoroalkylene group.

Fluorosulfonyl group or sulfonic acid group-containing polymer, its production method and its application

The present invention relates to a method for producing a 1,3-dioxolane compound represented by formula 1, the method containing step (a), in which hexafluoroacetone monohydrate is brought into contact with a metal fluoride, step (b), in which fluorine gas is brought into contact, and step (c), in which an olefin compound represented by formula 2 is brought into contact. In formulae 1 and 2, Xto Xeach independently represent a hydrogen atom, fluorine atom, chlorine atom, or trifluoromethyl group. 

Production methods for 1,3-dioxolane compound and perfluoro(2,2-dimethyl-1,3-dioxole)

To provide a cathode active material with which a lithium ion secondary battery having favorable cycle characteristics and having a high energy density even when discharged at a high voltage can be obtained; a cathode comprising the cathode active material; and a lithium ion secondary battery having the cathode. A cathode active material comprising a composite oxide (A) containing Li and at least one transition metal element selected from the group consisting of Ni, Co and Mn, and the following particles (B) and the following fluorinated carbon material (C) present on the surface of the composite oxide (A):

Cathode active material, process for its production, cathode and lithium ion secondary battery

The present invention relates to an optical member including a TiO-containing silica glass having: a TiOconcentration of from 3 to 10% by mass; a Ticoncentration of 100 wt ppm or less; a thermal expansion coefficient at from 0 to 100&#xb0; C., CTE, of 0&#xb1;150 ppb/&#xb0; C.; and an internal transmittance in the wavelength range of 400 to 700 nm per a thickness of 1 mm, T, of 80% or more, in which the optical member has a ratio of variation of Ticoncentration to an average value of the Ticoncentration, &#x394;Ti/Ti, on an optical use surface, is 0.2 or less.

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To provide a novel fluorination treatment method whereby the surface of oxide glass can be treated for fluorination at low cost and with excellent adhesiveness. A method for treating the surface of oxide glass, which comprises contacting the surface of oxide glass with a gas of a fluorinating agent or a mixed gas having a fluorinating agent diluted with an inert gas, wherein the fluorinating agent is an elemental fluorine, or a fluorine compound capable of cleaving a bond between an oxygen atom and a metal atom in the framework of the oxide glass and forming a bond between a fluorine atom and the metal atom; and the concentration of hydrogen fluoride at the surface of oxide glass with which the fluorinating agent is in contact, is controlled to be at most 1 mol %.

Method for treating surface of oxide glass with fluorinating agent

The present invention relates to a process for production of a synthetic quartz glass having a fluorine concentration of 1,000 mass ppm or more, the process comprising: (a) a step of depositing and growing quartz glass fine particles obtained by flame hydrolysis of a glass forming raw material onto a substrate, to thereby form a porous glass body; (b) a step of keeping the porous glass body in a reaction vessel that is filled with elemental fluorine (F) or a mixed gas comprising elemental fluorine (F) diluted with an inert gas and contains a solid metal fluoride, to thereby obtain a fluorine-containing porous glass body; and (c) a step of heating the fluorine-containing porous glass body to a transparent vitrification temperature, to thereby obtain a fluorine-containing transparent glass body.

Process for production of synthetic quartz glass

Provided is a method for depositing a fluorine-doped silicon oxide film on the surface of a substrate made of a material comprising at least 50 mass % of an ethylene/tetrafluoroethylene copolymer. This method comprises flowing a mixed gas into between electrodes, exposing the mixed gas to electric power applied between the electrodes so that the electrical power density between the electrodes becomes from 0.5 to 1.1 W/cmto cause discharge, and forming plasma of the mixed gas and depositing the fluorine-doped silicon oxide film on the surface of the substrate. In this method, the mixed gas for forming the fluorine-doped silicon oxide film comprises silicon tetrafluoride, oxygen and a hydrocarbon, the atomic ratio of oxygen atoms to carbon atoms (O/C) is from 1 to 10, and the atomic ratio of oxygen atoms to silicon atoms (O/Si) is from 1.7 to 25 in the mixed gas.

Method for production of an ethylene/tetrafluorideethylene copolymer molded product

The present invention is to provide a synthetic quartz glass body having a high light transmittance. The present invention provides a synthetic quartz glass body having pores in a surface part thereof.

Growing community of inventors

Chiyoda-ku, Japan

Chikaya Tamitsuji