公开(公告)号：US11084895B2

公开(公告)日：2021-08-10

申请号：US15038307

申请日：2014-12-01

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Taku Yamanaka ,  Makoto Ono ,  Kohei Yasuda ,  Masahiko Yamada ,  Shinichi Chaen ,  Yasuhiko Sawada ,  Takahiro Taira ,  Hirotoshi Yoshida ,  Taketo Kato

IPC: C08F214/18 ,  C08J5/18 ,  C08F214/26 ,  B29C55/04

Abstract: The present invention aims to provide a modified polytetrafluoroethylene fine powder capable of providing a stretched body having high strength, a small pore size, and excellent homogeneity. The modified polytetrafluoroethylene fine powder of the present invention has non-melt-processability, has a standard specific gravity of 2.155 or lower, includes 0.015 mol % or more of a polymer unit derived from perfluoro(methyl vinyl ether) in all the monomer units, is obtained by emulsion polymerizing tetrafluoroethylene and at least the perfluoro(methyl vinyl ether) in the presence of a fluorosurfactant having a LogPOW value of 3.4 or lower, and has an extrusion pressure of 20.0 MPa or lower.

公开(公告)号：US09663601B2

公开(公告)日：2017-05-30

申请号：US15136494

申请日：2016-04-22

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Takahiro Taira ,  Hiroyuki Yoshimoto ,  Taketo Kato ,  Yasuhiko Sawada

IPC: C08F114/18 ,  C08F214/26 ,  C08F259/08 ,  C08L51/00

CPC classification number: C08F214/262 ,  C08F214/26 ,  C08F259/08 ,  C08L51/003 ,  Y10T428/1352 ,  C08L2666/02

Abstract: The present invention provides a modified polytetrafluoroethylene fine powder which can be processed into molded articles high in thermal stability, chemical resistance and transparency and for which the extrusion pressure can be lowered. The present invention is a modified polytetrafluoroethylene fine powder, wherein the cylinder extrusion pressure at a reduction ratio of 1600 is not higher than 50 MPa and the haze value of molded article a for measurement formed therefrom is not higher than 60.

公开(公告)号：US12012470B2

公开(公告)日：2024-06-18

申请号：US17974402

申请日：2022-10-26

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Taketo Kato ,  Satoru Yoneda ,  Manabu Fujisawa ,  Kazuya Asano ,  Takahiro Kitahara ,  Masahiro Higashi ,  Akiyoshi Yamauchi ,  Sumi Ishihara ,  Yosuke Kishikawa ,  Shinnosuke Nitta ,  Marina Nakano ,  Hirotoshi Yoshida ,  Yoshinori Nanba ,  Kengo Ito ,  Chiaki Okui ,  Hirokazu Aoyama ,  Masamichi Sukegawa ,  Taku Yamanaka ,  Yuuji Tanaka ,  Kenji Ichikawa ,  Yohei Fujimoto ,  Hiroyuki Sato

IPC: C08F14/26 ,  C08K5/098 ,  C08K5/42

CPC classification number: C08F14/26 ,  C08K5/098 ,  C08K5/42 ,  C08K2201/014 ,  C08K2201/019

Abstract: A composition including a fluoropolymer and substantially free from a compound represented by the following formula (3): (H—(CF2)8—SO3)qM2, wherein M2 is H, a metal atom, NR54, imidazolium optionally containing a substituent, pyridinium optionally containing a substituent, or phosphonium optionally containing a substituent; R5s are each H or an organic group and are the same as or different from each other; and q is 1 or 2.

公开(公告)号：US12006407B2

公开(公告)日：2024-06-11

申请号：US18103443

申请日：2023-01-30

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Ken Yoshida ,  Hirotoshi Yoshida ,  Keisuke Hagi ,  Masayuki Tsuji ,  Taketo Kato ,  Yuuji Tanaka ,  Taku Yamanaka ,  Kazuya Kawahara ,  Masamichi Sukegawa ,  Kazutaka Hosokawa

IPC: C08J3/12 ,  C08F8/06 ,  C08F8/50 ,  C08F14/26 ,  C08J3/28

CPC classification number: C08J3/12 ,  C08F8/06 ,  C08F8/50 ,  C08F14/26 ,  C08J3/28 ,  C08F2500/07 ,  C08F2500/17 ,  C08F2800/20 ,  C08F2810/40 ,  C08J2327/18 ,  C08J2327/22 ,  C08F8/50 ,  C08F8/06 ,  C08F114/26 ,  C08F8/50 ,  C08F8/06 ,  C08F214/26

Abstract: Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C., having a melt viscosity of 1×102 to 7×105 Pa·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 106 carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.

公开(公告)号：US20240002558A1

公开(公告)日：2024-01-04

申请号：US18467238

申请日：2023-09-14

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Hiroyuki SATO ,  Kenji Ichikawa ,  Taketo Kato ,  Taku Yamanaka

IPC: C08F114/26

CPC classification number: C08F114/26

Abstract: The present disclosure provides a method for producing a fluororesin, which includes polymerizing a fluorine-containing monomer in the presence of a compound (1) having triple bond and a hydrophilic group and an aqueous medium to produce a fluororesin, a fluororesin comprising a unit based on a compound (1) having triple bond and a hydrophilic group, and a fluorine-containing monomer unit, and an aqueous dispersion comprising the fluororesin and an aqueous medium.

公开(公告)号：US11767379B2

公开(公告)日：2023-09-26

申请号：US16976945

申请日：2019-03-01

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Yoshinori Nanba ,  Kenji Ichikawa ,  Yohei Fujimoto ,  Hirotoshi Yoshida ,  Hiroyuki Sato ,  Taketo Kato ,  Kengo Ito ,  Sumi Ishihara ,  Masahiro Higashi ,  Satoru Yoneda ,  Hirokazu Aoyama ,  Masamichi Sukegawa ,  Yosuke Kishikawa ,  Takahiro Taira ,  Chiaki Okui ,  Taku Yamanaka

IPC: C08F14/26 ,  B29C55/00 ,  C08F2/22 ,  C08F2/44 ,  C08F261/06 ,  C08F114/26 ,  C08F214/26 ,  B29K27/18

CPC classification number: C08F14/26 ,  B29C55/005 ,  C08F2/22 ,  C08F2/44 ,  C08F114/26 ,  C08F214/26 ,  C08F261/06 ,  B29K2027/18

Abstract: 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 CX2═CY(—CZ2—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 C—C100 fluorine-containing alkylene group and having an ether bond; and A is —COOM, —SO3M, or —OSO3M, wherein M is —H, a metal atom, —NR74, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent, wherein R7 is H or an organic group, providing that at least one of X, Y, and Z contains a fluorine atom.

公开(公告)号：US11512155B2

公开(公告)日：2022-11-29

申请号：US16499047

申请日：2018-03-30

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Taketo Kato ,  Satoru Yoneda ,  Manabu Fujisawa ,  Kazuya Asano ,  Takahiro Kitahara ,  Masahiro Higashi ,  Akiyoshi Yamauchi ,  Sumi Ishihara ,  Yosuke Kishikawa ,  Shinnosuke Nitta ,  Marina Nakano ,  Hirotoshi Yoshida ,  Yoshinori Nanba ,  Kengo Ito ,  Chiaki Okui ,  Hirokazu Aoyama ,  Masamichi Sukegawa ,  Taku Yamanaka ,  Yuuji Tanaka ,  Kenji Ichikawa ,  Yohei Fujimoto ,  Hiroyuki Sato

IPC: C08F14/26 ,  C08K5/098 ,  C08K5/42

Abstract: 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 R1a—CO—R2a—CO—R3a-Aa and a surfactant represented by R1b—CO—(CR2b2)n—(OR3b)p—(CR4b2)q-L-Ab.

公开(公告)号：US10793650B2

公开(公告)日：2020-10-06

申请号：US16696970

申请日：2019-11-26

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Ken Yoshida ,  Hirotoshi Yoshida ,  Keisuke Hagi ,  Masayuki Tsuji ,  Taketo Kato ,  Yuuji Tanaka ,  Taku Yamanaka ,  Kazuya Kawahara ,  Masamichi Sukegawa ,  Kazutaka Hosokawa

IPC: C08F2/46 ,  C08F2/50 ,  C08G61/04 ,  C08F8/50 ,  C08J3/28 ,  C08K5/01 ,  C08K5/03

Abstract: Low molecular weight polytetrafluoroethylene powder having a complex viscosity of 1×102 to 7×105 Pa·s at 380° C., containing 5 or less carboxyl groups at ends of the molecule chain per 106 carbon atoms in the main chain, and being substantially free from C8-C14 perfluorocarboxylic acids and salts thereof. Also disclosed is a method for producing low molecular weight polytetrafluoroethylene.

公开(公告)号：US20200123283A1

公开(公告)日：2020-04-23

申请号：US16696970

申请日：2019-11-26

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Ken YOSHIDA ,  Hirotoshi Yoshida ,  Keisuke Hagi ,  Masayuki Tsuji ,  Taketo Kato ,  Yuuji Tanaka ,  Taku Yamanaka ,  Kazuya Kawahara ,  Masamichi Sukegawa ,  Kazutaka Hosokawa

IPC: C08F8/50 ,  C08J3/28 ,  C08K5/03 ,  C08K5/01

Abstract: Low molecular weight polytetrafluoroethylene powder having a complex viscosity of 1×102 to 7×103 Pa·s at 380° C., containing 5 or less carboxyl groups at ends of the molecule chain per 106 carbon atoms in the main chain, and being substantially free from C8-C14 perfluorocarboxylic acids and salts thereof. Also disclosed is a method for producing low molecular weight polytetrafluoroethylene.

公开(公告)号：US10538605B2

公开(公告)日：2020-01-21

申请号：US16069052

申请日：2017-08-04

Applicant: DAIKIN INDUSTRIES, LTD.

Inventor： Ken Yoshida ,  Hirotoshi Yoshida ,  Keisuke Hagi ,  Masayuki Tsuji ,  Taketo Kato ,  Yuuji Tanaka ,  Taku Yamanaka ,  Kazuya Kawahara ,  Masamichi Sukegawa ,  Kazutaka Hosokawa

IPC: C08F2/46 ,  C08F2/50 ,  C08G61/04 ,  C08F8/50 ,  C08J3/28

Abstract: A method for producing low molecular weight polytetrafluoroethylene less likely to generate C8-C14 perfluorocarboxylic acids and salts thereof. The method includes: (1) feeding into an airtight container: polytetrafluoroethylene; at least one additive selected from the group consisting of hydrocarbons, chlorinated hydrocarbons, alcohols, and carboxylic acids other than C8-C14 perfluorocarboxylic acids; and at least one selected from the group consisting of inert gases other than the above additive and oxygen adsorbents; and (2) irradiating the polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a complex viscosity of 1×102 to 7×105 Pa·s at 380° C.