Daikin Industries, Ltd.

Takeda Chemical Industries, Inc.

Asahi Kasei E-materials Corporation

Asahi Kasei Kabushiki Kaisha

Masahiro Kondo

Tadashi Ino

Takashi Yoshimura

Noriyuki Shinoki

Akio Miyake

Masahiko Fujino

Naoto Miyake

Masaharu Nakazawa

Tadaharu Isaka

Hitoshi Imamura

Naoki Sakamoto

Takahiko Murai

Eri Mukai

Takayuki Araki

Nobuhiko Tsuda

Katsuhiko Imoto

Masanori Ikeda

Takehiro Koga

Nobuyuki Uematsu

Kazuhiro Ohtsuka

Yoshiki Shimizu

Yuichi Inoue

Yuuki Kuwajima

Tomohiro Isogai

Hiroyuki Hamada

Takahiro Tago

Takuya Ichida

Kuon Miyazaki

Tatsuo Suzuki

Yasushi Yonei

Ryuzi Iwakiri

Toshiya Mantani

Eiji Honda

Kohei Kita

Keiko Yamazaki

Shinsuke Ohshita

Yuki Yotsumoto

Yuko Iizuka

Yuichi Hashikawa

Hideki Iijima

Yasuhiro Hashimoto

A method for producing a tube for a chemical solution pipe composed of a cleaned fluororesin molded article, the method including cleaning a tube-shaped fluororesin molded article with a chemical solution; and cleaning the tube-shaped fluororesin molded article with water. The cleaning with water is performed after the cleaning with a chemical solution, and the chemical solution is an alcohol or an aqueous alcohol solution.

Method and system for producing fluororesin molded article

A molded article containing a copolymer including a tetrafluoroethylene unit and a perfluoro(alkyl vinyl ether) unit, wherein a surface roughness Ra of the molded article is 0.20 μm or less, and a water contact angle of the molded article is 80 degrees or less. Also disclosed is a method for producing the molded article.

Molded article and production method therefor

A molding material including a melt-fabricable fluororesin and having a metal content of 100 ng/1 g or less as measured by an ashing method. Also disclosed is a tube made of the molding material.

Molding material and tube

A fluororesin material including a melt-fabricable fluororesin, the fluororesin material having a dielectric constant of 2.1 or less and a dielectric loss tangent of 0.00030 or less at 12 GHz. Also disclosed is a fluororesin material for high-frequency transmission including the fluororesin material and a coated electric wire for high-frequency transmission including a solid insulating coating layer made of the fluororesin material.

Fluororesin material, fluororesin material for high frequency transmission, and covered electric wire for high-frequency transmission

The invention provides a powder that is easily redispersible in a liquid medium such as water. The powder contains a fluoropolymer. The fluoropolymer contains at least one group A selected from the group consisting of &#x2014;SOY, &#x2014;COOR, &#x2014;SOX, &#x2014;SONR, and &#x2014;COOX, wherein Y is a halogen atom; R is a C1-C4 alkyl group; X is Mor NR, where M is a hydrogen atom or an L-valent metal, the L-valent metal being a metal in group 1, group 2, group 4, group 8, group 11, group 12, or group 13 of the periodic table; and Rs are each individually a hydrogen atom or a C1-C4 alkyl group. The powder exhibits a dispersion of 50% or higher. The dispersion is calculated by filtering a composition obtainable by mixing the powder with water through a mesh having an opening of 20 &#x3bc;m.

Fluoropolymer powder and method for producing same

Provided is a twisted wire including a plurality of covered wires twisted together, each covered wire including a conductor and an insulator covering the periphery of the conductor, wherein the twisted wire satisfies Inequality (1): y&#x3c;A&#xd7;x/(z/500)+B (wherein x: a pitch length (mm) of the twisted wire, y: a collapsing rate (%) of the insulator, z: an elastic modulus (MPa) of the insulator, A: Constant A=&#x2212;1, and B: Constant B=11.5).

Twisted wire and manufacturing method thereof

The present invention aims to provide an ionomer that can exhibit high oxygen permeability, especially under both low- and high-humidified conditions, and high power generation durability. The high oxygen permeable ionomer includes a specific repeating unit A and repeating unit B and has an equivalent weight of 250 to 930 and a glass transition temperature of 100&#xb0; C. to 130&#xb0; C.

Ionomer having high oxygen permeability

A method for preparing a fluoropolymer aqueous dispersion, including: step (A) of preparing a fluoropolymer aqueous dispersion comprising a fluoropolymer having at least one selected from the group consisting of &#x2014;SOY and &#x2014;COOR (wherein Y is a halogen, and R is a C1 to C4 alkyl) by emulsion polymerization; step (B) of heating the fluoropolymer aqueous dispersion to 50&#xb0; C. or higher; and step (C) of contacting the fluoropolymer aqueous dispersion with an ion exchange resin for cation exchange after step (B), thereby providing a purified fluoropolymer aqueous dispersion, the fluoropolymer aqueous dispersion being adjusted to pH 7 or lower from the end of the polymerization in step (A) to the end of step (C).

Method for producing aqueous fluorine-containing polymer dispersing element, and purified aqueous fluorine-containing polymer dispersing element

A method for producing an electrolyte emulsion, the method including: Step (1) in which an ethylenic fluoromonomer and a fluorovinyl compound having an SOZgroup, wherein Zis a halogen element, are copolymerized at a polymerization temperature of 0&#xb0; C. or higher and 40&#xb0; C. or lower to provide a precursor emulsion containing a fluoropolymer electrolyte precursor; and Step (2) in which a basic reactive liquid is added to the precursor emulsion and the fluoropolymer electrolyte precursor is chemically treated, whereby an electrolyte emulsion with a fluoropolymer electrolyte dispersed therein is provided, wherein the electrolyte emulsion has an equivalent weight (EW) of 250 or more and 700 or less.

Electrolyte emulsion and process for producing same

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

The present invention provides a fluoropolymer electrolyte material which has improved processability and which is easily produced. The electrolyte emulsion of the present invention comprises an aqueous medium and a fluoropolymer electrolyte dispersed in the aqueous medium. The fluoropolymer electrolyte has a monomer unit having an SOZ group (Z is an alkali metal, an alkaline-earth metal, hydrogen, or NRRRR, and R, R, R, and Reach are individually a C1-C3 alkyl group or hydrogen). The fluoropolymer electrolyte has an equivalent weight (EW) of 250 or more and 700 or less and a proton conductivity at 110&#xb0; C. and relative humidity 50% RH of 0.10 S/cm or higher. The fluoropolymer electrolyte is a spherical particulate substance having an average particle size of 10 to 500 nm. The fluoropolymer electrolyte has a ratio (the number of SOF groups)/(the number of SOZ groups) of 0 to 0.01.

A coating material including a perfluorocarbon sulfonic acid resin which is a copolymer including a polymerization unit represented by &#x2014;(CF&#x2014;CFZ)&#x2014;, in the formula, Z being H, Cl, F, or a C1-C3 perfluoroalkyl group, and a polymerization unit represented by &#x2014;(CF&#x2014;CF(&#x2014;O&#x2014;(CF)&#x2014;SOH))&#x2014;, in the formula, m being an integer of 1 to 12, and the perfluorocarbon sulfonic acid resin has an equivalent weight EW of 200 to 1000. Also disclosed is a laminate including a base material and a hydrophilic layer formed from the coating material.

Coating material and layered body

The present invention provides an electrolyte having high conductivity even under high-temperature low-humidification conditions (e.g. at a temperature of 100 to 120&#xb0; C. and a humidity of 20 to 50% RH) and thereby makes it possible to realize a higher performance fuel cell. The present invention is a fluoropolymer electrolyte having an equivalent weight (EW) of not less than 250 but not more than 700 and a proton conductivity of not lower than 0.10 S/cm as measured at a temperature of 110&#xb0; C. and a relative humidity of 50% RH and comprising a COOZ group- or SOZ group-containing monomer unit, wherein Z represents an alkali metal, an alkaline earth metal, hydrogen atom or NRRRRin which R, R, Rand Reach independently represents an alkyl group containing 1 to 3 carbon atoms or hydrogen atom.

Polyelectrolyte and process for producing the polyelectrolyte

The present invention provides a method for producing 3-chloro-pentafluoropropene at a high yield through one reaction step of chlorinating perfluoroallyl fluorosulfate. The present invention directs to a method for producing 3 -chloro-pentafluoropropene, including the step of bringing perfluoroallyl fluorosulfate and an onium chloride compound into contact with each other to produce the 3-chloro-pentafluoropropene.

Method for producing 3-chloro-pentafluoropropene

Growing community of inventors

Settsu, Japan

Masahiro Kondo