Daikin Industries, Ltd.

Panasonic Corporation

Kengo Ito

Hirotoshi Yoshida

Taku Yamanaka

Taketo Kato

Yoshinori Nanba

Kenji Ichikawa

Hiroyuki Sato

Yohei Fujimoto

Masamichi Sukegawa

Chiaki Okui

Hirokazu Aoyama

Yosuke Kishikawa

Sumi Ishihara

Masahiro Higashi

Satoru Yoneda

Takahiro Kitahara

Akiyoshi Yamauchi

Marina Nakano

Yuuji Tanaka

Manabu Fujisawa

Kazuya Asano

Shinnosuke Nitta

Katsuhiko Imoto

Takahiro Taira

Kenji Gobou

Hideto Nakagawa

Takuma Kawabe

Yoshito Tanaka

Hideki Kono

Koichiro Ogita

Kenji Ishii

Moe Hosokawa

Yuji Imahori

Kenjiro Tanimoto

Mayumi Iida

Keizo Shiotsuki

Akiko Ohya

Eri Tanioka

Hiromitsu Miyata

A method for producing modified polytetrafluoroethylene including: polymerizing tetrafluoroethylene and a modifying monomer in an aqueous medium in the presence of a polymer (I) containing a polymerization unit (I) based on a monomer represented by the following general formula (I) to obtain a modified polytetrafluoroethylene:CXX=CXR(—CZZ-A)  (I)wherein Xand Xare each independently F, Cl, H, or CF; Xis H, F, an alkyl group, or a fluorine-containing alkyl group; Ais an anionic group; R is a linking group; Zand Zare each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more. Also disclosed is a composition containing the modified polytetrafluoroethylene and the polymer (I).

Production method of modified polytetrafluoroethylene and composition

A method for producing a fluoropolymer, which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (1), the polymer (1) including a polymerized unit derived from a monomer CX═CY(—CZ—O—Rf-A), wherein X is the same or different and is —H or —F; Y is —H, —F, an alkyl group, or a fluorine-containing alkyl group; Z is the same or different and is —H, —F, an alkyl group, or a fluoroalkyl group; Rf is a C1-C40 fluorine-containing alkylene group or a C2-C100 fluorine-containing alkylene group and having an ether bond; and A is —COOM, —SOM, or —OSOM, wherein M is —H, a metal atom, —NR, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent, wherein R' is H or an organic group, providing that at least one of X, Y, and Z contains a fluorine atom.

Method for manufacturing fluoropolymer

A surfactant for polymerization including at least one selected from a surfactant represented by R—CO—R—CO—R—OSOXand a surfactant represented by R—CO—(CR)—(OR)—(CR)-L-OSOX, wherein R, R, R, X, R, R, R, R, L and Xare as defined herein. Also disclosed is a composition containing a fluoropolymer and the at least one surfactant, a composition containing a fluoropolymer and a compound represented by (H—(CF)—SO)M, where Mis as defined herein, and a molded article made from the composition containing a fluoropolymer and the compound represented by (H—(CF)—SO)M.

Production method for fluoropolymer, surfactant for polymerization, and use of surfactant

A composition including a polytetrafluoroethylene and a polymer (I) containing a polymerization unit (I) based on a monomer represented by the following general formula (I), the composition having a standard specific gravity of 2.200 or less:CXX═CXR(—CZZ-A)  (I)wherein Xand Xare each independently F, Cl, H, or CF; Ais an anionic group; Xis H, F, an alkyl group, or a fluorine-containing alkyl group; R is a linking group; Zand Zare each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more.

Composition and stretched body

A composition including a fluoropolymer and substantially free from a compound represented by the following formula (3): (H—(CF)—SO)M, wherein Mis H, a metal atom, NR, imidazolium optionally containing a substituent, pyridinium optionally containing a substituent, or phosphonium optionally containing a substituent; Rs are each H or an organic group and are the same as or different from each other; and q is 1 or 2.

A method for producing polytetrafluoroethylene, which includes polymerizing tetrafluoroethylene in an aqueous medium in the presence of a nucleating agent and a hydrocarbon anionic surfactant to obtain polytetrafluoroethylene. A total amount of the nucleating agent and the hydrocarbon anionic surfactant at the initiation of polymerization is more than 50 ppm based on the aqueous medium.

Polytetrafluoroethylene production method

A method for producing a fluoropolymer, which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (1), the polymer (1) including a polymerized unit derived from a monomer CX&#x2550;CY(&#x2014;CZ&#x2014;O&#x2014;Rf-A), wherein X is the same or different and is &#x2014;H or &#x2014;F; Y is &#x2014;H, &#x2014;F, an alkyl group, or a fluorine-containing alkyl group; Z is the same or different and is &#x2014;H, &#x2014;F, an alkyl group, or a fluoroalkyl group; Rf is a C1-C40 fluorine-containing alkylene group or a C&#x2014;C100 fluorine-containing alkylene group and having an ether bond; and A is &#x2014;COOM, &#x2014;SOM, or &#x2014;OSOM, wherein M is &#x2014;H, a metal atom, &#x2014;NR, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent, wherein Ris H or an organic group, providing that at least one of X, Y, and Z contains a fluorine atom.

A method for producing a fluoropolymer which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a surfactant to provide a fluoropolymer, the surfactant being represented by the general formula (1): CRRR&#x2014;CRR&#x2014;X-A, wherein Rto Rare each H or a monovalent substituent, with the proviso that at least one of Rand Rrepresents a group represented by the general formula: &#x2014;Y&#x2014;Rand at least one of Rand Rrepresents a group represented by the general formula: &#x2014;X-A or a group represented by the general formula: &#x2014;Y&#x2014;R; and A is the same or different at each occurrence and is &#x2014;COOM, &#x2014;SOM, or &#x2014;OSOM. Also disclosed is a surfactant for polymerization represented by the general formula (1), a method for producing a fluoropolymer using the surfactant and a composition including a fluoropolymer and the surfactant.

Method for manufacturing fluoropolymer, surfactant for polymerization, use for surfactant, and composition

A method for producing a fluoropolymer of the invention which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a surfactant to provide a fluoropolymer. The surfactant includes at least one selected from the group consisting of a surfactant represented by R&#x2014;CO&#x2014;R&#x2014;CO&#x2014;R-Aand a surfactant represented by R&#x2014;CO&#x2014;(CR)&#x2014;(OR)&#x2014;(CR)-L-A.

A method for producing a fluoropolymer which includes polymerizing a fluoromonomer in an aqueous medium in the presence of a surfactant to provide a fluoropolymer. The surfactant includes at least one selected from the group consisting of a surfactant represented by R&#x2014;CO&#x2014;R&#x2014;CO&#x2014;R&#x2014;OSOXand a surfactant represented by R&#x2014;CO&#x2014;(CR)&#x2014;(OR)&#x2014;(CR)-L-OSOX.

Provided is a polymer capable of providing a coating film that has good initial adhesiveness to a base material and good adhesiveness thereto after a pressure cooker test, and has excellent abrasion resistance as determined by a falling sand abrasion test. The polymer includes a perhaloolefin unit, a vinyl ester unit that contains neither a hydroxy group nor an aromatic ring; and a hydroxy group-containing monomer unit. The polymer has a hydroxyl value of 110 mgKOH/g or greater.

Polymer, composition, coating film, layered product, back sheet, and solar cell module

The invention provides a back sheet including a water-impermeable sheet and a film firmly bonded to each other and exhibiting excellent adhesiveness to an EVA encapsulant layer of a solar cell module even without corona discharge treatment on the film surface. The back sheet of the invention is a back sheet for solar cell module, including a water-impermeable sheet and a film. The film is disposed on at least one side of the water-impermeable sheet and is formed from a coating containing a fluorine-containing copolymer. The fluorine-containing copolymer contains a C2-C3 perhaloolefin structural unit, a vinyl acetate structural unit, a hydroxy-containing vinyl monomer structural unit, and a carboxy-containing monomer structural unit.

Back sheet of solar cell module, and solar cell module

Provided is a paint composition which can give a coating having excellent stretchability and further having excellent contamination resistance. A solvent-based paint composition comprises a fluorocopolymer (I), and an organic solvent (II), the fluorocopolymer (I) including: a perhaloolefin structural unit (a) that contains two carbon atoms, a vinyl acetate structural unit (b), a hydroxyl group-containing vinyl monomer structural unit (c) represented by the following formula (1): CH&#x2550;CH&#x2014;O&#x2014;(CH)&#x2014;OH wherein n is an integer of 2 or more, and a carboxyl group-containing monomer structural unit (d) represented by the following formula (2): RRC&#x2550;CR&#x2014;(CH)&#x2014;COOH wherein R, R, and Rare the same as or different from one another, and each a hydrogen atom or a C1-C10 linear or branched alkyl group; and m is an integer of 2 or more.

Solvent-based paint composition and fluorine-containing copolymer

It is an object of the present invention to provide a fluororesin composition which hardly causes molding defects even when high-speed molding is performed in covering extrusion molding within a relatively broad molding temperature range and which can give covered electric wires, in particular foamed electric wires, excellent in surface smoothness. A fluororesin composition comprising a polytetrafluoroethylene [PTFE] having a standard specific gravity of 2.15 to 2.30 and a tetrafluoroethylene/hexafluoropropylene-based copolymer [FEP],

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Osaka, Japan

Kengo Ito