公开(公告)号：US20200056031A1

公开(公告)日：2020-02-20

申请号：US16661064

申请日：2019-10-23

申请人： AGC INC. ,  AGC Chemicals Europe, Limited

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.

公开(公告)号：US11104787B2

公开(公告)日：2021-08-31

申请号：US16661064

申请日：2019-10-23

申请人： AGC INC. ,  AGC Chemicals Europe, Limited

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.

公开(公告)号：US20180298131A1

公开(公告)日：2018-10-18

申请号：US15977326

申请日：2018-05-11

申请人： ASAHI GLASS COMPANY, LIMITED ,  AGC CHEMICALS EUROPE, LIMITED

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.

公开(公告)号：US11421058B2

公开(公告)日：2022-08-23

申请号：US16684637

申请日：2019-11-15

申请人： AGC Inc.

发明人： Shinya Higuchi ,  Masahiro Takazawa ,  Takehiro Kose

IPC分类号： C08F214/18 ,  H01B3/44 ,  C08F214/26 ,  H01B7/02

摘要： A modified polytetrafluoroethylene which can be formed under a low extrusion pressure and with which changes of the extrusion pressure are suppressed, even in paste extrusion at a high RR ratio, and its production method. The modified polytetrafluoroethylene having units based on tetrafluoroethylene, 0.020 to 0.040 mass % of units based on a monomer represented by the following formula (1), and 0.003 to 0.080 mass % of units based on a monomer represented by the following formula (2), each based on all units of the modified polytetrafluoroethylene. The monomers of formulae (1) and (2) are represented by: CH2═CH—CnF2n+1 (1), wherein n is from 2 to 6; and CF2═CFO(LO)mRf (2), wherein L is a perfluoroalkylene group, Rf is a perfluoroalkyl group, and m is an integer of from 0 to 4.

公开(公告)号：US20200095353A1

公开(公告)日：2020-03-26

申请号：US16684637

申请日：2019-11-15

申请人： AGC Inc.

发明人： Shinya Higuchi ,  Masahiro Takazawa ,  Takehiro Kose

IPC分类号： C08F214/18 ,  H01B3/44 ,  H01B7/02

摘要： To provide a modified PTFE which can be formed under a low extrusion pressure and with which changes of the extrusion pressure are suppressed, even in paste extrusion at a high RR ratio, and its production method.A modified polytetrafluoroethylene having units based on tetrafluoroethylene, units based on a monomer represented by the following formula (1) and units based on a monomer represented by the following formula (2),wherein the content of the units based on the monomer represented by the formula (1) is from 0.020 to 0.040 mass % to all units of the modified polytetrafluoroethylene, andthe content of the units based on the monomer represented by the formula (2) is from 0.003 to 0.080 mass % to all units of the modified polytetrafluoroethylene: CH2═CH—CnF2n+1  (1) wherein n is from 2 to 6; CF2═CFO(LO)mRf  (2) wherein L is a perfluoroalkylene group, Rf is a perfluoroalkyl group, and m is an integer of from 0 to 4.