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15 条记录 (耗时 0.021 秒)

    Purification of fluorinated carboxylic acids
    2.
    发明授权
    Purification of fluorinated carboxylic acids 失效
    氟化羧酸的纯化

    公开(公告)号：US5312935A

    公开(公告)日：1994-05-17

    申请号：US50874

    申请日：1993-04-21

    申请人： Ludwig Mayer ,  Gernot Lohr

    发明人： Ludwig Mayer ,  Gernot Lohr

    IPC分类号： C07C51/44 ,  C07C51/487 ,  C07C53/21 ,  C02F1/72

    CPC分类号： C07C51/487

    摘要： Fluorinated carboxylic acids which do not have the required purity for use as emulsifier in the polymerization of fluorinated monomers can, if necessary after prior de-watering, be treated with oxidants, whereupon the isolation of the pure product is carried out by crystallisation or, preferably, by distillation.

    摘要翻译： 在氟化单体的聚合中不具有所需纯度的氟化羧酸，如果需要，可以在预先脱水之后用氧化剂进行处理，然后通过结晶或优选进行纯产物的分离 ，通过蒸馏。

    Aqueous fluoropolymer dispersion comprising a melt processible fluoropolymer and having a reduced amount of fluorinated surfactant
    5.
    发明申请
    Aqueous fluoropolymer dispersion comprising a melt processible fluoropolymer and having a reduced amount of fluorinated surfactant 审中-公开
    包含可熔融加工的含氟聚合物并且具有减少量的氟化表面活性剂的含水氟聚合物分散体

    公开(公告)号：US20050043471A1

    公开(公告)日：2005-02-24

    申请号：US10933738

    申请日：2004-09-03

    申请人： Rebekka Epsch ,  Freidrich Kloos ,  Gernot Lohr

    发明人： Rebekka Epsch ,  Freidrich Kloos ,  Gernot Lohr

    IPC分类号： C08F2/00 ,  C08F6/16 ,  C09D127/12

    CPC分类号： C08F6/16 ,  C09D127/12 ,  C08L2666/54

    摘要： The present invention provides an aqueous fluoropolymer dispersion comprising a melt processible fluoropolymer in an amount of at least 25% by weight based on the weight of the aqueous fluoropolymer dispersion and a fluorinated surfactant having a molecular weight of not more than 1000 g/mol in an amount of not more than 100 ppm, preferably less than 50 ppm, more preferably less than 25 ppm and most preferably less than 10 ppm based on the weight of fluoropolymer solids or being free of said fluorinated surfactant. The aqueous fluoropolymer dispersion has a conductivity of at least 200 μS/cm, preferably at least 500 μS/cm and more preferably at least 1000 μS/cm.

    摘要翻译： 本发明提供一种含氟聚合物含水聚合物，其含有至少25重量％的可熔融加工的含氟聚合物，其含量基于含氟聚合物水分散体的含量和分子量不超过1000g / mol的氟化表面活性剂 相对于含氟聚合物固体的重量或不含所述氟化表面活性剂，其量不超过100ppm，优选小于50ppm，更优选小于25ppm，最优选小于10ppm。 含氟聚合物水分散体的电导率为至少200μS/ cm，优选为至少500μS/ cm，更优选为至少1000μS/ cm。

    Process for the preparation of tetrafluoroethylene polymer in aqueous suspension
    7.
    发明授权
    Process for the preparation of tetrafluoroethylene polymer in aqueous suspension 失效
    水性悬浮液中四氯氟乙烯聚合物的制备方法

    公开(公告)号：US5153285A

    公开(公告)日：1992-10-06

    申请号：US728692

    申请日：1991-07-11

    申请人： Bernd Felix ,  Gernot Lohr ,  Willibald Hofmeister ,  Rolf Hengel

    发明人： Bernd Felix ,  Gernot Lohr ,  Willibald Hofmeister ,  Rolf Hengel

    IPC分类号： C08F2/18 ,  C08F14/26

    CPC分类号： C08F14/26

    摘要： In the suspension polymerization of tetrafluoroethylene a mixture of tetrafluoroethylene and an inert gas is charged under pressure before starting the polymerization, the total pressure being 5 to 50 bar and the concentration of tetrafluoroethylene in this mixture being 30 to 70 mol %. Said concentration is kept within this range by an appropriate feed of tetrafluoroethylene during the polymerization. The granular PTFE powder obtained is distinguished by an improved grain structure and grindability.

    摘要翻译： 在四氟乙烯的悬浮聚合中，在开始聚合之前，在压力下加入四氟乙烯和惰性气体的混合物，总压力为5〜50巴，该混合物中四氟乙烯的浓度为30〜70摩尔％。 所述浓度通过聚合期间合适的四氟乙烯进料保持在该范围内。 获得的颗粒状PTFE粉末的特征在于改善的晶粒结构和可磨性。

    Process for reducing the amount of fluorinated surfactant in aqueous fluoropolymer dispersions
    9.
    发明申请
    Process for reducing the amount of fluorinated surfactant in aqueous fluoropolymer dispersions 审中-公开
    用于降低含氟聚合物水分散体中氟化表面活性剂的量的方法

    公开(公告)号：US20050070633A1

    公开(公告)日：2005-03-31

    申请号：US10992961

    申请日：2004-11-19

    申请人： Rebekka Epsch ,  Klaus Hintzer ,  Gernot Lohr ,  Werner Schwertfeger

    发明人： Rebekka Epsch ,  Klaus Hintzer ,  Gernot Lohr ,  Werner Schwertfeger

    IPC分类号： C08F6/16 ,  C08L27/12 ,  C08L1/00

    CPC分类号： C08F6/16 ,  C08F6/20 ,  C08L27/12

    摘要： The present invention provides a process of reducing the amount of fluorinated emulsifier in an aqueous fluoropolymer dispersion by contacting the aqueous fluoropolymer dispersion with an anion exchange resin in a non-fixed resin bed, the process comprising: (a) mixing the aqueous fluoropolymer dispersion with an effective amount of a surfactant so as to stabilize the fluoropolymer dispersion while being contacted with the anion exchange resin; (b) contacting the aqueous fluoropolymer dispersion with an anion exchange resin by agitating the aqueous fluoropolymer dispersion with an effective amount of anion exchange resin for a time of less than 4 hours to reduce the amount of fluorinated emulsifier in the aqueous fluoropolymer dispersion to a desired level; and (c) separating the anion exchange resin from the aqueous fluoropolymer dispersion.

    摘要翻译： 本发明提供一种通过使含氟聚合物含水分散体与阴离子交换树脂在非固定树脂床中接触来降低含氟聚合物水分散体含量的方法，该方法包括：（a）将含氟聚合物水分散体与 有效量的表面活性剂，以便在与阴离子交换树脂接触的同时稳定含氟聚合物分散体; （b）通过用有效量的阴离子交换树脂搅拌含氟聚合物水分散体少于4小时使含氟聚合物含水分散体与阴离子交换树脂接触，将含氟聚合物水分散体中的氟化乳化剂的量减少到所需的 水平; 和（c）从含氟聚合物含水分散体中分离阴离子交换树脂。