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公开(公告)号：US20230340169A1
公开(公告)日：2023-10-26
申请号：US18216644
申请日：2023-06-30
发明人： 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分类号： C08F14/26 , B29C55/00 , C08F2/22 , C08F2/44 , C08F261/06 , C08F114/26 , C08F214/26
CPC分类号： C08F14/26 , B29C55/005 , C08F2/22 , C08F2/44 , C08F261/06 , C08F114/26 , C08F214/26 , B29K2027/18
摘要： 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.
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公开(公告)号：US09976022B2
公开(公告)日：2018-05-22
申请号：US15316031
申请日：2015-06-04
发明人： Yoshinori Nanba , Dai Fukami , Takuya Yamabe , Taketo Kato , Makoto Ono , Takahiro Taira , Hirotoshi Yoshida , Taku Yamanaka
IPC分类号： C08L27/18 , C08F114/26
摘要： The present invention provides a polytetrafluoroethylene aqueous dispersion containing high-molecular-weight, significantly small polytetrafluoroethylene particles and having excellent dispersion stability. The present invention relates to an aqueous dispersion containing polytetrafluoroethylene particles containing a tetrafluoroethylene unit alone or a tetrafluoroethylene unit and a modifying monomer unit based on a modifying monomer copolymerizable with the tetrafluoroethylene. The polytetrafluoroethylene particles have a volume average particle size of not smaller than 0.1 nm but smaller than 20 nm, a melt flow rate of not lower than 0 g/10 min but lower than 80 g/10 min determined at 380° C. and 5 kg load, a melting point of 324° C. to 360° C., and an initial pyrolysis temperature of not lower than 400° C.
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公开(公告)号：US11767379B2
公开(公告)日：2023-09-26
申请号：US16976945
申请日：2019-03-01
发明人： 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分类号： C08F14/26 , B29C55/00 , C08F2/22 , C08F2/44 , C08F261/06 , C08F114/26 , C08F214/26 , B29K27/18
CPC分类号： C08F14/26 , B29C55/005 , C08F2/22 , C08F2/44 , C08F114/26 , C08F214/26 , C08F261/06 , B29K2027/18
摘要： 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.
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公开(公告)号：US09902787B2
公开(公告)日：2018-02-27
申请号：US15316032
申请日：2015-06-04
发明人： Yoshinori Nanba , Dai Fukami , Takuya Yamabe , Taketo Kato , Makoto Ono , Takahiro Taira , Hirotoshi Yoshida , Taku Yamanaka
CPC分类号： C08F14/26 , C08F2/26 , C08F214/262 , C10M147/00 , C10M2213/0626
摘要： The present invention provides a polytetrafluoroethylene powder having high dispersibility in lubricants. The polytetrafluoroethylene powder includes polytetrafluoroethylene containing a tetrafluoroethylene unit alone or a tetrafluoroethylene unit and a modifying monomer unit based on a modifying monomer copolymerizable with the tetrafluoroethylene, and has a specific surface area of 32 m2/g or larger.
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公开(公告)号：US12030790B2
公开(公告)日：2024-07-09
申请号：US17280972
申请日：2019-10-03
发明人： Takahiro Taira , Tadao Hayashi , Chiaki Okui , Ryou Hatayama , Michinobu Koizumi , Taketo Kato , Yuuji Tanaka , Hirotoshi Yoshida
IPC分类号： B01J41/04 , B01J20/20 , B01J20/28 , B01J41/12 , C02F1/28 , C02F1/42 , C02F101/36 , C02F103/38 , C08F14/26
CPC分类号： C02F1/283 , B01J20/20 , B01J20/28064 , B01J20/2808 , B01J20/28083 , B01J20/28085 , B01J41/04 , B01J41/12 , C02F1/42 , C08F14/26 , C02F2001/422 , C02F2101/36 , C02F2103/38
摘要： 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—(CF2)m—COO)pM1 General Formula (1):
wherein m is 3 to 19, M1 is H, a metal atom, NRb4, where Rb is 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—(CF2)n—SO3)qM2 General Formula (2):
wherein n is 4 to 20; M2 is H, a metal atom, NRb4, where Rb is 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.-
公开(公告)号：US11851519B2
公开(公告)日：2023-12-26
申请号：US16637601
申请日：2018-08-10
发明人： Takahiro Taira , Kazuhiro Mishima , Chiaki Okui , Tadao Hayashi , Hirotoshi Yoshida , Yuuji Tanaka , Masayoshi Miyamoto , Taku Yamanaka , Taketo Kato
摘要： 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—(CF2)m—COO)pM1; or Formula (1):
(H—(CF2)n—SO3)qM2. 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—(CF2)8—SO3)qM2. Formula (3):-
公开(公告)号：US11518826B2
公开(公告)日：2022-12-06
申请号：US16957288
申请日：2018-12-25
发明人： Kazuhiro Mishima , Takahiro Taira , Chiaki Okui , Takayuki Tanaka , Masayoshi Miyamoto , Taku Yamanaka
摘要： A method for producing a polytetrafluoroethylene powder, which includes applying an ultrasonic wave to a polytetrafluoroethylene aqueous dispersion containing polytetrafluoroethylene particles to coagulate the polytetrafluoroethylene particles.
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公开(公告)号：US11084895B2
公开(公告)日：2021-08-10
申请号：US15038307
申请日：2014-12-01
发明人： Taku Yamanaka , Makoto Ono , Kohei Yasuda , Masahiko Yamada , Shinichi Chaen , Yasuhiko Sawada , Takahiro Taira , Hirotoshi Yoshida , Taketo Kato
IPC分类号： C08F214/18 , C08J5/18 , C08F214/26 , B29C55/04
摘要： 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.
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9.发明授权公开(公告)号：US09663601B2
公开(公告)日：2017-05-30
申请号：US15136494
申请日：2016-04-22
IPC分类号： C08F114/18 , C08F214/26 , C08F259/08 , C08L51/00
CPC分类号： C08F214/262 , C08F214/26 , C08F259/08 , C08L51/003 , Y10T428/1352 , C08L2666/02
摘要： 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.
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