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9 条记录 (耗时 0.015 秒)

    Modified tetrafluoroethylene polymer and process for producing same
    1.
    发明授权
    Modified tetrafluoroethylene polymer and process for producing same 失效
    改性四氟聚乙烯聚合物及其生产方法

    公开(公告)号：US4134995A

    公开(公告)日：1979-01-16

    申请号：US874422

    申请日：1978-02-02

    申请人： Syozo Fumoto ,  Tetsuo Shimizu ,  Shigeru Ichiba

    发明人： Syozo Fumoto ,  Tetsuo Shimizu ,  Shigeru Ichiba

    IPC分类号： C08F214/26 ,  C08F259/08 ,  C08L27/04 ,  C08L27/18

    CPC分类号： C08F214/262 ,  C08F259/08

    摘要： In a process for polymerization of tetrafluoroethylene with a copolymerizable modifier in an aqueous medium containing a polymerization initiator and a dispersant to produce a modified tetrafluoroethylene polymer containing 0.001 to 2 wt.% of the copolymerizable modifier based on the weight of the polymer, a process for producing the modified tetrafluoroethylene polymer characterized in that:(1) chlorotrifluoroethylene is used as said copolymerizable modifier,(2) at least 50 wt.% of the copolymerizable modifier to be incorporated into the polymer is introduced into the polymerization system after 70 wt.% of the polymer to be finally formed has been formed, and(3) after 90 wt.% of the polymer to be finally formed has been formed, the concentration of said copolymerizable modifier is maintained at at least 0.01 mol.% based on the total amount of tetrafluoroethylene and the modifier in the polymerization system.

    Process for preparing polytetrafluoroethylene fine powders
    3.
    发明授权
    Process for preparing polytetrafluoroethylene fine powders 失效
    制备聚四氟乙烯精细粉末的方法

    公开(公告)号：US4098975A

    公开(公告)日：1978-07-04

    申请号：US776919

    申请日：1977-03-11

    申请人： Tetsuo Shimizu ,  Shigeru Ichiba ,  Shun Koizumi ,  Chuzo Okuno

    发明人： Tetsuo Shimizu ,  Shigeru Ichiba ,  Shun Koizumi ,  Chuzo Okuno

    IPC分类号： C08F2/00 ,  C08F2/16 ,  C08F2/18 ,  C08F14/00 ,  C08F14/26

    CPC分类号： C08F14/26

    摘要： A process for preparing a polytetrafluoroethylene fine powder by polymerizing tetrafluoroethylene in an aqueous medium containing a polymerization initiator and a dispersant, coagulating the resulting polymer, washing the coagulated polymer when desired, and drying the polymer, characterized in that after at least 30 wt. % of the whole amount of the tetrafluoroethylene to be polymerized has been polymerized at a constant temperature, the polymerization is conducted at an altered temperature at which the same whole amount, when polymerized, gives a polymer having an amorphous index at least 0.01 higher than when the whole amount is polymerized at the first-mentioned temperature.

    Method for emulsion polymerization of tetrafluoroethylene and method for prevention of irregular polymerization thereof
    7.
    发明授权
    Method for emulsion polymerization of tetrafluoroethylene and method for prevention of irregular polymerization thereof 失效
    四氟乙烯乳液聚合方法及防止其不规则聚合的方法

    公开(公告)号：US5814713A

    公开(公告)日：1998-09-29

    申请号：US875886

    申请日：1997-08-06

    申请人： Takuo Kawamura ,  Shigeru Ichiba ,  Tomizo Sota

    发明人： Takuo Kawamura ,  Shigeru Ichiba ,  Tomizo Sota

    IPC分类号： C08F2/22 ,  C08F14/26 ,  C08F2/00

    CPC分类号： C08F14/26

    摘要： (i) A method for emulsion polymerization of tetrafluoroethylene, which comprises emulsion-polymerizing tetrafluoroethylene in the presence of a polymerization initiator, a paraffin wax containing not larger than 100 ppm of a reducing substance and an emulsifier, and (ii) a method for preventing irregular polymerization of tetrafluoroethylene, which comprises using the above method for emulsion polymerization give a constant polymerization time, and polytetrafluoroethylene having values of physical properties which meet the desired standard requirements.

    摘要翻译： PCT No.PCT / JP96 / 03527 Sec。 371日期：1997年8月6日 102（e）日期1997年8月6日PCT 1996年12月3日PCT PCT。 公开号WO97 / 20863 日期：1997年6月12日（i）四氟乙烯的乳液聚合方法，其包括在聚合引发剂，含有不大于100ppm还原物质的石蜡和乳化剂的存在下将四氟乙烯乳化聚合，和 ii）防止四氟乙烯不规则聚合的方法，其包括使用上述乳液聚合方法得到恒定的聚合时间，以及具有满足期望标准要求的物理性能值的聚四氟乙烯。

    Polytetrafluoroethylene fine powder and process for producing the same
    8.
    发明授权
    Polytetrafluoroethylene fine powder and process for producing the same 失效
    聚四氟乙烯细粉及其制造方法

    公开(公告)号：US4159370A

    公开(公告)日：1979-06-26

    申请号：US850539

    申请日：1977-11-11

    申请人： Shun Koizumi ,  Shigeru Ichiba ,  Tetsuo Simizu ,  Chuzo Okuno ,  Tosinori Kadowaki ,  Katsutoshi Yamamoto

    发明人： Shun Koizumi ,  Shigeru Ichiba ,  Tetsuo Simizu ,  Chuzo Okuno ,  Tosinori Kadowaki ,  Katsutoshi Yamamoto

    IPC分类号： C08F14/00 ,  C08F2/00 ,  C08F2/16 ,  C08F2/18 ,  C08F14/26 ,  C08F214/26 ,  C08J3/12 ,  C08F114/26

    CPC分类号： C08F14/26

    摘要： Polytetrafluoroethylene fine powders which have an average molecular weight of not less than 5,000,000, preferably not less than 5,500,000, an amorphous index of not more than 0.1, preferably not more than 0.09, a number average primary particle size of 0.1 to 0.4 micron, preferably 0.15 to 0.38 micron, and a sharp endothermic peak at a temperature between 343.degree. C. and 350.degree. C. on the melting diagram by a differential scanning calorimeter, said sharp peak having an endothermic ratio of not more than 0.3, preferably not more than 0.27, and a half value width of the endothermic peak of not more than 8 degrees, preferably not more than 6 degrees, and a process for producing the polytetrafluoroethylene fine powders. The polytetrafluoroethylene fine powders have an excellent stretchability and are useful for electric wire coating, small diameter tubes, large diameter tubes, sealing tapes and the like.

    摘要翻译： 平均分子量不小于5,000,000，优选不小于5,500,000的聚四氟乙烯细粉末，数均一次粒径为0.1〜0.4微米，优选为0.15以下的无定形指数为0.1以下，优选为0.09以下 通过差示扫描量热计在熔点上在343℃和350℃之间的温度下具有尖锐的吸热峰，所述尖峰的吸热比不大于0.3，优选不大于0.27 ，吸热峰的半值宽度为8度以下，优选为6度以下，以及聚四氟乙烯细粉的制造方法。 聚四氟乙烯细粉末具有优异的拉伸性，可用于电线涂布，小直径管，大直径管，密封带等。

    Non-perfluoro fluorine-containing resin molded article having low-temperature heat-sealing property
    9.
    发明授权
    Non-perfluoro fluorine-containing resin molded article having low-temperature heat-sealing property 有权
    具有低温热封性的非全氟含氟树脂成形体

    公开(公告)号：US06392138B1

    公开(公告)日：2002-05-21

    申请号：US09806828

    申请日：2001-04-05

    申请人： Shigeru Ichiba ,  Yutaka Nakata ,  Kazuhiko Shimada

    发明人： Shigeru Ichiba ,  Yutaka Nakata ,  Kazuhiko Shimada

    IPC分类号： C08J500

    CPC分类号： B32B27/08 ,  B32B7/02 ,  B32B27/306 ,  B32B27/32 ,  B32B2323/04 ,  B32B2331/04 ,  B32B2457/12 ,  C08J7/12 ,  C08J2327/12 ,  H01M2/0275 ,  H01M2/0277 ,  Y10T428/31 ,  Y10T428/3154 ,  Y10T428/31855 ,  Y10T428/31909

    摘要： An excellent low temperature heat sealing property is imparted to a surface of a non-perfluoro fluorine-containing resin molded article having F/C of not more than 1.8. A non-perfluoro fluorine-containing resin molded article having a surface layer portion having a low temperature heat sealing property on at least a part of the surface layer thereof; said surface layer portion having a low temperature heat-sealing property has a ratio F/C of the number of fluorine atoms to the number of carbon atoms of 0.2≦F/C≦0.9 and a ratio O/C of the number of oxygen atoms to the number of carbon atoms of 0.09≦O/C≦0.40, and a remaining portion of the surface layer has a ratio F/C of the number of fluorine atoms to the number of carbon atoms which is larger than that of the surface layer portion having a low temperature heat-sealing property and is 0.8≦F/C≦1.8.

    摘要翻译： 对F / C为1.8以下的非全氟含氟树脂成型体的表面赋予优异的低温热封性。 一种非全氟含氟树脂成型体，其表面层的至少一部分表面层部分具有低温热封性; 具有低温热封性的所述表面层部分的氟原子数与碳原子数的比F / C为0.2 <= F / C <= 0.9，并且其数目的O / C 氧原子的碳原子数为0.09 <= O / C <= 0.40，表面层的剩余部分的氟原子数与碳原子数的比率F / C大于 的表面层部分具有低温热封性，并且为0.8≤F/ C <= 1.8。