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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
Applicant: DAIKIN INDUSTRIES, LTD.
Inventor： Emi YAMAMOTO , Takuya YAMABE , Yoshihiro SODA , Taku YAMANAKA , Takahiro TAIRA , Yohei FUJIMOTO , Taketo KATO
Abstract: 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：US20230348636A1
公开(公告)日：2023-11-02
申请号：US18349237
申请日：2023-07-10
Applicant: DAIKIN INDUSTRIES, LTD.
Inventor： Ranna YAMAZAKI , Taketo KATO , Taku YAMANAKA , Hirotoshi YOSHIDA , Takuya YAMABE , Akiho OGURA
IPC: C08F114/26 , C08F2/26 , C08K5/14 , C08F6/22 , C08F6/20
CPC classification number: C08F114/26 , C08F2/26 , C08K5/14 , C08F6/22 , C08F6/20
Abstract: Provided is a fluoropolymer composition production method for producing a fluoropolymer composition containing a fluoropolymer, the method which includes polymerizing a fluoromonomer in a reactor in the presence of a fluorine-containing surfactant, a polymerization initiator, and an aqueous medium to prepare an aqueous dispersion containing a fluoropolymer; after the aqueous dispersion is prepared, removing from the reactor the fluoromonomer remaining in the reactor, or recovering the aqueous dispersion in the reactor and accommodating the aqueous dispersion in a container different from the reactor; adding a radical generator to the aqueous dispersion; and subjecting to a heat treatment the aqueous dispersion comprising the radical generator to give a fluoropolymer composition.
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Patent Agency Ranking
公开(公告)号：US20230203297A1
公开(公告)日：2023-06-29
申请号：US18178918
申请日：2023-03-06
Applicant: DAIKIN INDUSTRIES, LTD.
Inventor： Takuya YAMABE , Emi YAMAMOTO , Yoshihiro SODA , Taku YAMANAKA , Ryota USAMI , Taketo KATO , Tomohiro SHIROMARU , Yasukazu NAKATANI
CPC classification number: C08L27/24 , C08F2/30 , C08L27/18 , C08L2201/54
Abstract: A modified polytetrafluoroethylene aqueous dispersion having low viscosity at high temperature. The modified polytetrafluoroethylene aqueous dispersion contains a modified polytetrafluoroethylene and a nonionic surfactant, has a modified polytetrafluoroethylene solid concentration of 50 to 70% by mass, is substantially free from a fluorine-containing surfactant, and has a viscosity at 55° C. of 80 mPa•s or lower, and the modified polytetrafluoroethylene contains 0.050% by mass or more and 1.00% by mass or less of a polymerized unit based on a modifying monomer.
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公开(公告)号：US20170107368A1
公开(公告)日：2017-04-20
申请号：US15316031
申请日：2015-06-04
Applicant: DAIKIN INDUSTRIES, LTD.
Inventor： Yoshinori NANBA , Dai FUKAMI , Takuya YAMABE , Taketo KATO , Makoto ONO , Takahiro TAIRA , Hirotoshi YOSHIDA , Taku YAMANAKA
IPC: C08L27/18
Abstract: 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：US20230348637A1
公开(公告)日：2023-11-02
申请号：US18349314
申请日：2023-07-10
Applicant: DAIKIN INDUSTRIES, LTD.
Inventor： Ranna YAMAZAKI , Taketo KATO , Taku YAMANAKA , Hirotoshi YOSHIDA , Takuya YAMABE , Akiho OGURA
IPC: C08F114/26 , C08F2/26 , C08K5/14 , C08F6/22 , C08F6/20
CPC classification number: C08F114/26 , C08F2/26 , C08K5/14 , C08F6/22 , C08F6/20
Abstract: A fluoropolymer composition production method for producing a fluoropolymer composition containing a fluoropolymer, the method which includes polymerizing a fluoromonomer in a reactor in the presence of a fluorine-containing surfactant, a polymerization initiator, and an aqueous medium to prepare an aqueous dispersion comprising a fluoropolymer; feeding an inert gas to the reactor; and subjecting to a heat treatment the aqueous dispersion in the reactor to give a fluoropolymer composition, wherein a temperature of the heat treatment is 35° C. or higher and a time of the heat treatment is 15 minutes or more.
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公开(公告)号：US20170107309A1
公开(公告)日：2017-04-20
申请号：US15316032
申请日：2015-06-04
Applicant: DAIKIN INDUSTRIES, LTD.
Inventor： Yoshinori NANBA , Dai FUKAMI , Takuya YAMABE , Taketo KATO , Makoto ONO , Takahiro TAIRA , Hirotoshi YOSHIDA , Taku YAMANAKA
IPC: C08F14/26
CPC classification number: C08F14/26 , C08F2/26 , C08F214/262 , C10M147/00 , C10M2213/0626
Abstract: 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：US20170096504A1
公开(公告)日：2017-04-06
申请号：US15316024
申请日：2015-06-04
Applicant: DAIKIN INDUSTRIES, LTD.
Inventor： Yoshinori NANBA , Dai FUKAMI , Takuya YAMABE , Taketo KATO , Makoto ONO , Takahiro TAIRA , Hirotoshi YOSHIDA , Taku YAMANAKA
IPC: C08F114/26 , C08L27/18
CPC classification number: C08F114/26 , C08F2/24 , C08F14/00 , C08F14/26 , C08L27/18 , C08L2201/50 , C08F2/26
Abstract: The present invention provides a method for producing a fluoropolymer aqueous dispersion having a significantly small particle size and excellent dispersion stability. The present invention relates to a method for producing an aqueous dispersion containing at least one fluoropolymer selected from the group consisting of polytetrafluoroethylene and melt-fabricable fluororesins excluding polytetrafluoroethylene. The method includes polymerizing a fluoromonomer in an aqueous medium in the presence of a fluorosurfactant and a polymerization initiator. The fluorosurfactant has a concentration in the aqueous medium of not lower than 0.8 times the critical micelle concentration of the fluorosurfactant.
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