Daikin Industries, Ltd.

Sumitomo Electric Fine Polymer, Inc.

Hirotoshi Yoshida

Taku Yamanaka

Taketo Kato

Yuuji Tanaka

Yoshinori Nanba

Masamichi Sukegawa

Yohei Fujimoto

Chiaki Okui

Kenji Ichikawa

Hiroyuki Sato

Kengo Ito

Yosuke Kishikawa

Sumi Ishihara

Masahiro Higashi

Takahiro Taira

Satoru Yoneda

Hirokazu Aoyama

Masayuki Tsuji

Akiyoshi Yamauchi

Kazutaka Hosokawa

Kazuya Kawahara

Keisuke Hagi

Ken Yoshida

Marina Nakano

Takahiro Kitahara

Manabu Fujisawa

Kazuya Asano

Shinnosuke Nitta

Makoto Ono

Tadao Hayashi

Takuya Yamabe

Kazuaki Ikeda

Dai Fukami

Hong-Phuc Nguyen

Michinobu Koizumi

Ryou Hatayama

Yoshito Tanaka

Takayuki Nakamura

Emi Yamamoto

Katsuhiko Imoto

Masahiko Yamada

Yasuhiko Sawada

Shinichi Chaen

Moe Hosokawa

Masayoshi Miyamoto

Takuma Kawabe

Yuji Imahori

Kazuhiro Mishima

Mayumi Iida

Kohei Yasuda

Akiko Ohya

A method for producing a fluoropolymer powder including (A1) adding, to a fluoropolymer aqueous dispersion obtained by polymerization using a carboxylic acid type hydrocarbon surfactant, and an acid to adjust a pH to 4.0 or less and cause coagulation to thereby obtain a wet fluoropolymer powder containing a fluorine-containing compound represented by the following general formula (1A), and (B1) heat-treating the wet fluoropolymer powder at a temperature higher than 150° C. and lower than 240° C.: General Formula (1A): H—(CF)—COOH wherein m is 3 to 19.

Method for producing fluoropolymer powder

A composition containing a polytetrafluoroethylene, a polymer (I) containing a polymerization unit (I) based on a monomer represented by the general formula (I), a nonionic surfactant, and an aqueous medium, wherein a content of the polytetrafluoroethylene in the composition is 10% by mass or more based on the composition, and a content of the nonionic surfactant in the composition is 1.0% by mass or more based on the 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.

Composition and method for producing the same

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 method for removing a fluorine-containing compound from discharge water, which includes bringing discharge water containing two or more fluorine-containing compounds represented by the following general formula (1) or (2) into contact with an adsorbent so as to adsorb the two or more fluorine-containing compounds:(H—(CF)—COO)M  General Formula (1):wherein m is 3 to 19, Mis H, a metal atom, NR, where Ris the same or different and is H or an organic group having 1 to 10 carbon atoms, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent; and p is 1 or 2;(H—(CF)—SO)M  General Formula (2):wherein n is 4 to 20; Mis H, a metal atom, NR, where Ris the same as above, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent; and q is 1 or 2.

Method for removing fluorine-containing compound from waste water

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 method for producing a fluoropolymer aqueous dispersion, including a step A of subjecting a pre-treatment aqueous dispersion containing a fluoropolymer obtained by polymerization in the presence of a hydrocarbon surfactant to ultrafiltration, microfiltration, or dialysis membrane treatment, or a combination thereof. The ultrafiltration is performed using an ultrafiltration membrane having a molecular weight cutoff of 0.3×10Da or more.

Process for producing aqueous fluoropolymer dispersion

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.

Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 1×10to 7×10Pa·s at 380° C., having a melt viscosity of 1×10to 7×10Pa·s at 380° C., having an average particle size of 1.0 to 50 μm, and containing 30 or more carboxyl groups at ends of the molecule chain per 10carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.

Method for producing low molecular weight polytetrafluoroethylene, low molecular weight polytetrafluoroethylene, and powder

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 an aqueous dispersion of purified polytetrafluoroethylene, the method including: removing or reducing a compound represented by Formula (1) or (2) below from an aqueous dispersion of polytetrafluoroethylene obtained using a hydrocarbon surfactant:(H—(CF)—COO)M; or  Formula (1):(H—(CF)—SO)M.  Formula (2): Also disclosed is a composition containing polytetrafluoroethylene substantially free from a compound represented by Formula (3) below and a molded body including the composition:(H—(CF)—SO)M.  Formula (3):

Method for producing purified polytetrafluoroethylene aqueous dispersion liquid, method for producing modified polytetrafluoroethylene powder, method for producing polytetrafluoroethylene molded body, and composition

Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 1&#xd7;10to 7&#xd7;10Pa&#xb7;s at 380&#xb0; C., having a melt viscosity of 1&#xd7;10to 7&#xd7;10Pa&#xb7;s at 380&#xb0; C., having an average particle size of 1.0 to 50 &#x3bc;m, and containing 30 or more carboxyl groups at ends of the molecule chain per 10carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.

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.

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Osaka, Japan

Hirotoshi Yoshida