Daikin Industries, Ltd.

Taketo Kato

Taku Yamanaka

Hirotoshi Yoshida

Yoshinori Nanba

Masamichi Sukegawa

Kenji Ichikawa

Yohei Fujimoto

Yuuji Tanaka

Hiroyuki Sato

Chiaki Okui

Takahiro Taira

Kengo Ito

Masahiro Higashi

Yosuke Kishikawa

Tetsuo Shimizu

Hirokazu Aoyama

Masayuki Tsuji

Sumi Ishihara

Satoru Yoneda

Kazuya Kawahara

Makoto Ono

Takahiro Kitahara

Akiyoshi Yamauchi

Yasuhiko Sawada

Kazutaka Hosokawa

Keisuke Hagi

Ken Yoshida

Marina Nakano

Manabu Fujisawa

Takeshi Inaba

Shigehito Sagisaka

Kazuya Asano

Shinnosuke Nitta

Takayuki Araki

Takuya Arase

Masaji Komori

Tsuyoshi Miyamori

Masami Kato

Masayoshi Miyamoto

Tadao Hayashi

Takuya Yamabe

Soushi Tsuchiya

Nobuhiko Tsuda

Masahiro Kumegawa

Hiroyuki Yoshimoto

Masaki Irie

Shunji Kasai

Dai Fukami

Michinobu Koizumi

Ryou Hatayama

Mayumi Yamauchi

Souta Yuasa

Emi Yamamoto

Masahiko Yamada

Tatsuya Higuchi

Shinichi Chaen

Takeshi Shimono

Kazuo Ishiwari

Chie Sawauchi

Moe Hosokawa

Takayuki Hirao

Hidenori Ozaki

Kazuhiro Mishima

Junya Iida

Kenjiro Tanimoto

Atsuko Tanaka

Kohei Yasuda

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

The present disclosure provides a method for producing a fluoropolymer, the method includes polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (1) to obtain a fluoropolymer, wherein the polymer (1) is a polymer of a monomer (1) represented by the general formula (1) below, in which the content of a dimer and a trimer of the monomer (1) is 1.0% by mass or less based on the polymer (1):CF═CF—R—CZZ-A  (1)wherein R is a linking group; Zand Zare each independently F or CF; and Ais an anionic group.

Method for producing fluoropolymer, method for producing polytetrafluoroethylene, method for producing perfluoroelastomer, and composition

A method for producing a fluoropolymer, which includes: polymerizing a monomer (I) represented by the general formula (I) below in an aqueous medium substantially in the absence of a fluorine-containing surfactant (except for the monomer (I) represented by the general formula (I)) to obtain a crude composition containing a polymer of the monomer (I); removing a dimer and a trimer of the monomer (I) contained in the crude composition from the crude composition to obtain a polymer (I) in which the content of the dimer and trimer of the monomer (I) is 1.0% by mass or less based on the polymer (I); and polymerizing a fluoromonomer in an aqueous medium in the presence of the polymer (I) to obtain a fluoropolymer:CXX═CXR(—CZZ-A)  (I)wherein Xand X, X, A, R, Zand Zare as defined herein.

Method for producing fluoropolymer

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

Provided is a method for producing polytetrafluoroethylene, which includes polymerizing tetrafluoroethylene in an aqueous medium in the presence of a nucleating agent and a polymer (I) containing a polymerization unit (I) based on a monomer represented by the general formula (I) to obtain 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.

Polytetrafluoroethylene production method

A method for producing a perfluoroelastomer, which includes carrying out polymerization of a perfluoromonomer in an aqueous medium in the presence of a polymer (1) having a number average molecular weight of 0.3×10or more to provide a perfluoroelastomer, the polymer (1) containing a polymerized unit (1) derived from a monomer represented by the following general formula (1):CX═CY(—CZ—O—Rf-A)  (1)wherein X, Y, Z, Rf and A are as defined herein, with the proviso that at least one of X, Y, and Z contains a fluorine atom.

Method for producing perfluoroelastomer and composition

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 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.

Growing community of inventors

Settsu, Japan

Taketo Kato