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公开(公告)号：US10975187B2
公开(公告)日：2021-04-13
申请号：US15789320
申请日：2017-10-20
IPC分类号： C08F259/08 , C08F214/26 , C09D5/03 , C09D127/18 , C09D151/00 , H01B3/44 , H01B7/02 , H01B13/00 , H01B17/58 , C08F214/28 , C08F216/14
摘要： To optimize the primary particle size of a modified PTFE fine powder to shorten the sintering time during the extrusion molding.
A modified polytetrafluoroethylene fine powder which is a fine powder of a non-melt-processable modified polytetrafluoroethylene comprising units derived from tetrafluoroethylene, units derived from hexafluoropropylene, units derived from a perfluoro(alkyl vinyl ether) represented by CF2═CFO—CnF2n+1 (n is an integer of from 1 to 6) and units derived from a (perfluoalkyl)ethylene represented by CH2═CH—CmF2m+1 (m is an integer of from 3 to 7).-
公开(公告)号：US11136423B2
公开(公告)日：2021-10-05
申请号：US15915727
申请日：2018-03-08
IPC分类号： C08F214/26 , B29C48/00 , B29C48/09 , C08F2/26 , B29C48/32 , B29C48/95 , B29C48/06 , C08J3/16 , F16L11/04 , B29K27/18 , B29K105/00
摘要： To provide a modified polytetrafluoroethylene which is excellent in the moldability by paste extrusion and the mechanical property of the molded article. A modified polytetrafluoroethylene fine powder which is a fine powder of a non-melt-moldable modified polytetrafluoroethylene, characterized in that the modified polytetrafluoroethylene comprises units derived from tetrafluoroethylene, units derived from a perfluoroalkyl vinyl ether represented by CF2═CFO—CnF2n+1 (wherein n is an integer of from 1 to 6), and units derived from a perfluoroalkylethylene represented by CH2═CH—CmF2m+1 (wherein m is an integer of from 3 to 6), and that the content of the units derived from the perfluoroalkyl vinyl ether is from 0.1 to 0.25 mass % and the content of the units derived from a perfluoroalkylethylene is from 0.001 to 0.1 mass %, based on all monomer units in the modified polytetrafluoroethylene.
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公开(公告)号：US20200056031A1
公开(公告)日：2020-02-20
申请号：US16661064
申请日：2019-10-23
发明人： Shigeki KOBAYASHI , Masahiro Takazawa , Ariana Claudia Morgovan-Ene , Anthony Eugene Wade , Diane Caine
IPC分类号： C08L27/18 , C08F214/26 , C08J5/18 , C08J5/24 , C09D127/18 , C09D7/20 , C09D7/45
摘要： To provide a PTFE aqueous dispersion which is excellent in mechanical stability, while being not susceptible to foaming. A polytetrafluoroethylene aqueous dispersion which is characterized by containing from 15 to 70 mass % of PTFE particles having an average primary particle diameter of from 0.1 to 0.5 μm; from 0.1 to 20,000 ppm, to the PTFE particles, of a fluorinated emulsifier selected from a C4-7 fluorinated carboxylic acid which may have an etheric oxygen atom, and salts of thereof; from 1 to 20 parts by mass, to 100 parts by mass of the PTFE particles, of a nonionic surfactant represented by R1—O-A-H (wherein R1 is a C8-18 alkyl group, and A is a polyoxyalkylene chain); from 0.004 to 0.040 parts by mass, to 100 parts by mass of the PTFE particles, of a polyether polysiloxane copolymer, wherein the polyether chain consists solely of a polyoxypropylene group; and water.
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公开(公告)号：US11104787B2
公开(公告)日：2021-08-31
申请号：US16661064
申请日：2019-10-23
发明人： Shigeki Kobayashi , Masahiro Takazawa , Ariana Claudia Morgovan-Ene , Anthony Eugene Wade , Diane Caine
IPC分类号： C08L27/18 , C09D7/20 , C09D7/45 , C08F214/26 , C08J5/18 , C08J5/24 , C09D127/18
摘要： To provide a PTFE aqueous dispersion which is excellent in mechanical stability, while being not susceptible to foaming. A polytetrafluoroethylene aqueous dispersion which is characterized by containing from 15 to 70 mass % of PTFE particles having an average primary particle diameter of from 0.1 to 0.5 μm; from 0.1 to 20,000 ppm, to the PTFE particles, of a fluorinated emulsifier selected from a C4-7 fluorinated carboxylic acid which may have an etheric oxygen atom, and salts of thereof; from 1 to 20 parts by mass, to 100 parts by mass of the PTFE particles, of a nonionic surfactant represented by R1—O-A-H (wherein R1 is a C8-18 alkyl group, and A is a polyoxyalkylene chain); from 0.004 to 0.040 parts by mass, to 100 parts by mass of the PTFE particles, of a polyether polysiloxane copolymer, wherein the polyether chain consists solely of a polyoxypropylene group; and water.
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公开(公告)号：US20180298131A1
公开(公告)日：2018-10-18
申请号：US15977326
申请日：2018-05-11
发明人： Shigeki Kobayashi , Hiroki Nagai , Shinya Higuchi , Akiko Tanaka , Masahiro Takazawa , Ariana Claudia Morgovan-Ene , Anthony Eugene Wade , Diane Caine
IPC分类号： C08F214/26 , C08J3/07
摘要： To provide a method for producing a tetrafluoroethylene copolymer-containing aqueous dispersion excellent in stability against a mechanical stress. The method for producing an aqueous dispersion containing a tetrafluoroethylene copolymer is characterized by comprising a polymerization step of subjecting tetrafluoroethylene (TFE) and a (perfluoroalkyl) ethylene to a polymerization reaction in an aqueous medium using a polymerization initiator in the presence of a fluorinated emulsifier, to obtain an aqueous emulsion having a solid content concentration of from 10 to 45 mass %, and a concentrating step of adding a nonionic surfactant represented by R1—O-A-H (R1 is a C8-18 alkyl group, and A is a polyoxyalkylene chain) to the aqueous emulsion, followed by concentration to a solid content concentration of from 50 to 70% to obtain an aqueous dispersion, wherein in the polymerization step, TFE is continuously or intermittently supplied to the polymerization reaction vessel, and a chain transfer agent is added at the time when from 10 to 95 mass % of the total mass of TFE to be used in the polymerization reaction has been supplied.
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