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公开(公告)号：US20220259337A1
公开(公告)日：2022-08-18
申请号：US17606368
申请日：2020-04-27
摘要： A method for producing a fluoropolymer aqueous dispersion, including a step A of performing ultrafiltration, microfiltration, or dialysis membrane treatment, or a combination thereof on a pretreatment aqueous dispersion containing a fluoropolymer obtained by polymerization in the presence of a polymer (I) including a polymerized unit (I) derived from a monomer represented by the following general formula (I), with the proviso that the fluoropolymer is other than the polymer (I): CX1X3═CX2R(—CZ1Z2-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：US20220119561A1
公开(公告)日：2022-04-21
申请号：US17424715
申请日：2020-01-31
发明人： Taketo KATO , Yohei FUJIMOTO , Kenji ICHIKAWA , Hiroyuki SATO , Yoshinori NANBA , Hirotoshi YOSHIDA , Kengo ITO , Taku YAMANAKA
IPC分类号： C08F114/26
摘要： A method for producing polytetrafluoroethylene includes a step of polymerizing tetrafluoroethylene in an aqueous medium in the presence of a hydrocarbon surfactant and a polymerization initiator to obtain polytetrafluoroethylene and a step of adding at least one selected from the group consisting of a radical scavenger and a decomposer of a polymerization initiator after the initiation of polymerization.
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3.发明申请公开(公告)号：US20210108008A1
公开(公告)日：2021-04-15
申请号：US16499047
申请日：2018-03-30
发明人： 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
摘要： 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.
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4.发明公开公开(公告)号：US20240317907A1
公开(公告)日：2024-09-26
申请号：US18655177
申请日：2024-05-03
发明人： 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
CPC分类号： C08F14/26 , C08K5/098 , C08K5/42 , C08K2201/014 , C08K2201/019
摘要： Composition including (a) a fluoropolymer; and (b1) at least one of a compound represented by the formula (4) ((H—(CF2)7—COO)pM1) or the formula (4′) ((H—(CF2)8—COO)pM1) of the present disclosure, both respectively in an amount of 100 ppb or less relative to the fluoropolymer, or (b2) at least one of a compound represented by the formula (5) ((H—(CF2)13—COO)pM1) or the formula (5′) ((H—(CF2)14—COO)pM1) of the present disclose, both respectively in an amount of 100 ppb or less relative to the fluoropolymer.
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5.发明公开公开(公告)号：US20230220129A1
公开(公告)日：2023-07-13
申请号：US18119371
申请日：2023-03-09
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： C08L27/18 , C08F2/28 , C08F114/26 , C08K5/19
CPC分类号： C08L27/18 , C08F2/28 , C08F114/26 , C08K5/19
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 R3 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, a composition including a fluoropolymer and the surfactant and a molded body including the composition.
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公开(公告)号：US20220289877A1
公开(公告)日：2022-09-15
申请号：US17747655
申请日：2022-05-18
发明人： Yohei FUJIMOTO , Kenji ICHIKAWA , Yoshinori NANBA , Taketo KATO , Taku YAMANAKA
IPC分类号： C08F14/26
摘要： 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: CX1X3═CX2R(—CZ1Z2-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：US20220282007A1
公开(公告)日：2022-09-08
申请号：US17747547
申请日：2022-05-18
发明人： Taku YAMANAKA , Masahiro HIGASHI , Taketo KATO , Kenji ICHIKAWA , Yohei FUJIMOTO , Masaki IRIE , Soushi TSUCHIYA , Souta YUASA
IPC分类号： C08F14/26
摘要： 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: CX1X3═CX2R(—CZ1Z2-A0)m (I) wherein X1 and X3, X2, A0, R, Z1 and Z2 are as defined herein.
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公开(公告)号：US20220275237A1
公开(公告)日：2022-09-01
申请号：US17687086
申请日：2022-03-04
发明人： Emi YAMAMOTO , Takuya YAMABE , Yoshihiro SODA , Taku YAMANAKA , Takahiro TAIRA , Yohei FUJIMOTO , Taketo KATO
摘要： A PTFE aqueous dispersion having low viscosity at high temperature. The PTFE aqueous dispersion contains PTFE and a nonionic surfactant, has a PTFE solid concentration of 50 to 70% by mass, is substantially free from a fluorine-containing surfactant, and has a viscosity at 55° C. of 50 mPa·s or lower. Also disclosed is a method for producing the PTFE aqueous dispersion, a coating film obtained by applying the PTFE aqueous dispersion, an impregnated film obtained by impregnating the PTFE aqueous dispersion, and a coated article containing a coating film obtained by applying the PTFE aqueous dispersion.
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公开(公告)号：US20210340290A1
公开(公告)日：2021-11-04
申请号：US17280554
申请日：2019-10-03
发明人： Taketo KATO , Yohei FUJIMOTO , Kenji ICHIKAWA , Hiroyuki SATO , Yoshinori NANBA , Hirotoshi YOSHIDA , Kengo ITO , Chiaki OKUI , Masamichi SUKEGAWA , Taku YAMANAKA
IPC分类号： C08F14/26
摘要： A method for producing polytetrafluoroethylene which include polymerizing tetrafluoroethylene and a modifying monomer in an aqueous medium in the presence of a hydrocarbon surfactant to obtain polytetrafluoroethylene. An amount of the hydrocarbon surfactant at the initiation of polymerization is more than 50 ppm based on the aqueous medium. Further, the polytetrafluoroethylene contains 99.0% by mass or more of a polymerization unit based on tetrafluoroethylene and 1.0% by mass or less of a polymerization unit based on the modifying monomer.
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公开(公告)号：US20230416421A1
公开(公告)日：2023-12-28
申请号：US18464931
申请日：2023-09-11
发明人： Takuya YOSHIOKA , Emi YAMAMOTO , Yohei FUJIMOTO , Taketo KATO , Taku YAMANAKA , Hirotoshi YOSHIDA
摘要： A method for producing a fluoropolymer aqueous dispersion, the method including concentrating a composition comprising a polymer (I) containing a polymerization unit (I) derived from a monomer (I) represented by the general formula (I), a fluoropolymer excluding the polymer (I), a nonionic surfactant, a fluorine-free anionic surfactant, and an aqueous medium to thereby obtain an aqueous dispersion containing the fluoropolymer,
CX1X3═CX2R(—CZ1Z2-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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