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    • 3. 发明授权
    • Granulated powder of polytetrafluoroethylene for molding and process for
the production thereof
    • 用于成型的聚四氟乙烯的造粒粉末及其制造方法
    • US5994499A
    • 1999-11-30
    • US68123
    • 1998-05-07
    • Michio AsanoShingo TanigawaTetsuo ShimizuShoji Kawachi
    • Michio AsanoShingo TanigawaTetsuo ShimizuShoji Kawachi
    • B01J2/12B01J2/14C08J3/12
    • C08J3/12B01J2/12B01J2/14C08J2327/18
    • To provide a polytetrafluoroethylene granular powder for molding and a process for preparing the granular powder, in which the granular powder contains only a small number of coarse particles, is obtained with good tumbling efficiency and further no organic liquid is required to be used. The process is for preparing a polytetrafluoroethylene granular powder for molding by granulating a polytetrafluoroethylene powder through tumbling with a granulator having a rotating inclined disc and a rotating side plate; characterized in that the granulator:(1) comprises a disc inclined to a horizontal level and a side plate provided on the periphery of the disc,(2) has the side plate assembled in one unit with the disc and rotating together, and(3) is equipped with an agitator positioned eccentrically to the center of a vortex of the polytetrafluoroethylene powder which is caused by tumbling,or the granulator:(1) comprises a disc inclined to a horizontal level and a side plate provided on the periphery of the disc,(2) has the side plate separated from the disc and being rotatable around the periphery of the disc, and(3) is equipped with an agitator positioned eccentrically to the center of a vortex of the polytetrafluoroethylene powder which is caused by tumbling,and that the granulation is carried out by tumbling the polytetrafluoroethylene powder wetted with an aqueous solution containing a surfactant.
    • PCT No.PCT / JP96 / 03238 Sec。 371日期1998年5月7日 102(e)日期1998年5月7日PCT提交1996年11月5日PCT公布。 WO97 / 17893 PCT出版物 日期1997年5月15日为了提供用于成型的聚四氟乙烯粒状粉末和制造粒状粉末的方法,其中粒状粉末仅含有少量的粗颗粒,具有良好的翻滚效率,并且还不需要有机液体 用过的。 该方法是通过用具有旋转的倾斜盘和旋转的侧板的造粒机进行翻转来制备聚四氟乙烯粒状粉末来模制聚四氟乙烯粉末, 其特征在于,造粒机(1)包括倾斜于水平的盘和设置在盘的周边上的侧板,(2)具有与盘一体地组装并且一起旋转的侧板,(3 )配备有一个搅拌器,该搅拌器偏心地设置在由翻转引起的聚四氟乙烯粉末的涡流的中心,或者造粒机:(1)包括倾斜于水平的盘和设置在盘的周边上的侧板 ,(2)具有与盘分离的侧板,并且能够围绕圆盘的周边旋转,(3)配备有一个搅拌器,该搅拌器偏心地位于由滚筒引起的聚四氟乙烯粉末的涡流的中心,以及 通过使用含有表面活性剂的水溶液润湿的聚四氟乙烯粉末进行翻转来进行造粒。
    • 4. 发明授权
    • Process for producing granular powder of modified polytetrafluoroethylene
    • 改性聚四氟乙烯颗粒粉末的制备方法
    • US6013700A
    • 2000-01-11
    • US11632
    • 1998-02-10
    • Michio AsanoShingo TanigawaShoji KawachiTetsuo Shimizu
    • Michio AsanoShingo TanigawaShoji KawachiTetsuo Shimizu
    • C08F16/14C08F214/26C08F216/14C08J3/12C08J3/16C08L27/12C08L27/18C08F14/26
    • C08J3/16C08J3/12C08J2327/18
    • To provide a process capable of preparing a modified PTFE granular powder, in which the ganular powder having excellent handling property, i.e. powder flowability and apparent density is prepared without using a finely pulverized powder and a molded article obtained from the granular powder has excellent physical properties, and a process capable of preparing a modified PTFE granular powder, in which the ganular powder is granulated with only water without using an organic liquid and further a molded article having a break down voltage equal to that in the case of using a finely pulverized powder of unmodified PTFE can be obtained. The granulation is carried out by stirring, in an aqueous medium, a powder of perfluoro(vinyl ether)-modified polytetrafluoroethylene prepared by suspension polymerization and having an average particle size of 100 to 300 .mu.m.
    • PCT No.PCT / JP96 / 02256 Sec。 371日期1998年2月10日 102(e)1998年2月10日PCT PCT 1996年8月8日PCT公布。 出版物WO97 / 07157 日期1997年2月27日为了提供能够制备改性PTFE粒状粉末的方法,其中制备具有优异处理性能的粉状粉末,即粉末流动性和表观密度,而不使用细粉碎的粉末和由颗粒状 粉末具有优异的物理性能,以及能够制备改性PTFE粒状粉末的方法,其中,在不使用有机液体的情况下,仅使用水造粒的球形粉末,并且还具有与下列情况相同的断裂电压的成型体: 可以获得未改性PTFE的细粉碎粉末。 通过在水性介质中搅拌通过悬浮聚合制备的平均粒径为100〜300μm的全氟(乙烯基醚)改性的聚四氟乙烯的粉末来进行造粒。