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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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2.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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3.发明公开公开(公告)号：US20240150505A1
公开(公告)日：2024-05-09
申请号：US18397595
申请日：2023-12-27
发明人： Takahiro TAIRA , Kazuhiro Mishima , Takayuki Tanaka , Takeki Kusunoki , Masayoshi Miyamoto , Tomoki Minamiyama , Mitsuo Tsukamoto , Kenji Ichikawa , Takuya Yamabe , Hirotoshi Yoshida , Taketo Kato , Taku Yamanaka
IPC分类号： C08F214/26 , B29C43/00 , C08F2/18 , C08F6/24 , C08F8/22
CPC分类号： C08F214/262 , B29C43/003 , B29C43/006 , C08F2/18 , C08F6/24 , C08F8/22 , B29K2027/18
摘要： A method for producing a polytetrafluoroethylene powder, which includes subjecting tetrafluoroethylene to suspension polymerization in an aqueous medium to prepare a suspension-polymerized particle of non melt-processible polytetrafluoroethylene, drying the suspension-polymerized particle to prepare a dry particle, subjecting the dry particle to fluorine radical treatment to prepare a fluorine radical-treated particle, and crushing the fluorine radical-treated particle to produce a polytetrafluoroethylene powder. Also disclosed is a polytetrafluoroethylene formed article obtained by forming the polytetrafluoroethylene powder, as well as a polytetrafluoroethylene compression-molded article obtained by compression molding the polytetrafluoroethylene powder.
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4.发明公开公开(公告)号：US20240026043A1
公开(公告)日：2024-01-25
申请号：US18478285
申请日：2023-09-29
发明人： Hirofumi Mukae , Yosuke Kishikawa , Taku Yamanaka , Taketo Kato , Ryuo Itoh , Hiroki Kubota
CPC分类号： C08F14/26 , C08L27/18 , C08L2205/025
摘要： A method for producing a fluororesin composition for compression molding excluding ram extrusion molding, the method including: mixing a powder of a fluororesin A1 having a history of being heated to a melting point thereof or higher and an aqueous dispersion containing particles of a fluororesin B1 and having a solid concentration of 50% by mass or lower to provide a mixture; and drying the mixture to provide a fluororesin composition.
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公开(公告)号：US11814490B2
公开(公告)日：2023-11-14
申请号：US17078365
申请日：2020-10-23
发明人： Ken Yoshida , Hirotoshi Yoshida , Keisuke Hagi , Masayuki Tsuji , Taketo Kato , Yuuji Tanaka , Taku Yamanaka , Kazuya Kawahara , Masamichi Sukegawa , Kazutaka Hosokawa
CPC分类号： 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
摘要： 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.
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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：US11634514B2
公开(公告)日：2023-04-25
申请号：US16967965
申请日：2019-02-07
发明人： Taketo Kato , Satoru Yoneda , Masahiro Higashi , Akiyoshi Yamauchi , Sumi Ishihara , Yosuke Kishikawa , Moe Hosokawa , Marina Nakano , Hirotoshi Yoshida , Yoshinori Nanba , Kengo Ito , Chiaki Okui , Kenji Ichikawa , Yohei Fujimoto , Hirokazu Aoyama , Masamichi Sukegawa , Taku Yamanaka , Hiroyuki Sato
IPC分类号： C08F14/26 , C08F2/26 , C08F2/22 , C08F114/26 , C08F214/22 , C08K5/11
摘要： 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): CR1R2R4—CR3R5—X-A, wherein R1 to R5 are each H or a monovalent substituent, with the proviso that at least one of R1 and R3 represents a group represented by the general formula: —Y—R6 and at least one of R2 and R5 represents a group represented by the general formula: —X-A or a group represented by the general formula: —Y—R6; and A is the same or different at each occurrence and is —COOM, —SO3M, or —OSO3M. 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.
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公开(公告)号：US11629238B2
公开(公告)日：2023-04-18
申请号：US17078365
申请日：2020-10-23
发明人： Ken Yoshida , Hirotoshi Yoshida , Keisuke Hagi , Masayuki Tsuji , Taketo Kato , Yuuji Tanaka , Taku Yamanaka , Kazuya Kawahara , Masamichi Sukegawa , Kazutaka Hosokawa
摘要： 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.
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公开(公告)号：US20220185917A1
公开(公告)日：2022-06-16
申请号：US17687325
申请日：2022-03-04
发明人： Yoshinori NANBA , Emi Yamamoto , Takuya Yamabe , Yohei Fujimoto , Kenji Ichikawa , Taketo Kato , Taku Yamanaka , Hirotoshi Yoshida
IPC分类号： C08F14/26
摘要： 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, CX1X3═CX2R(—VZ1Z2-A0)m (I) wherein X1 and X3 are each independently F, Cl, H, or CF3; X2 is H, F, an alkyl group, or a fluorine-containing alkyl group; A0 is an anionic group; R is a linking group; Z1 and Z2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more.
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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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