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    • 4. 发明授权
    • Granular polytetrafluoroethylene powders and process for producing the same
    • 颗粒状聚四氟乙烯粉末及其制造方法
    • US06440559B1
    • 2002-08-27
    • US09403521
    • 1999-10-22
    • Michio AsanoKazuya Kawahara
    • Michio AsanoKazuya Kawahara
    • B32B516
    • C08J3/12C08J3/205C08J2327/18Y10T428/2982Y10T428/2991Y10T428/2998
    • To provide a filler-containing or non-filler-containing polytetrafluoroethylene granular powder having a high apparent density, a small electrostatic charge and a superior powder flowability and giving a molded product which is free from lowering of tensile strength and elongation and coloring attributable to the surfactant and has a high degree of whiteness, and a process for preparing the same. The granulation is carried out by wetting 100 part by weight of a polytetrafluoroethylene powder or a mixture of polytetrafluoroethylene powder and filler with 30 to 60 parts by weight of an aqueous solution containing a nonionic surfactant having a hydrophobic segment comprising a poly(oxyalkylene) unit having 3 or 4 carbon atoms and a hydrophilic segment comprising a poly(oxyethylene) unit and then applying a mechanical force to the wetted polytetrafluoroethylene powder or the wetted mixture of polytetrafluoroethylene powder and filler.
    • 为了提供具有高表观密度,小静电荷和优异的粉末流动性的含填料或非填料的聚四氟乙烯粒状粉末,并且得到不降低拉伸强度和伸长率的成型产品, 表面活性剂,并且具有高白度,及其制备方法。 造粒是通过将100重量份聚四氟乙烯粉末或聚四氟乙烯粉末和填料的混合物与30至60重量份的含有疏水性链段的非离子表面活性剂的水溶液进行,所述疏水性链段包含聚(氧化烯)单元, 3或4个碳原子的亲水链段和包含聚(氧乙烯)单元的亲水链段,然后对润湿的聚四氟乙烯粉末或浸渍的聚四氟乙烯粉末和填料的混合物施加机械力。
    • 5. 发明授权
    • Filled granular polytetrafluoroethylene powder
    • 填充颗粒状聚四氟乙烯粉末
    • US06350801B1
    • 2002-02-26
    • US09403596
    • 1999-10-22
    • Michio AsanoMasamichi Sukegawa
    • Michio AsanoMasamichi Sukegawa
    • C08K340
    • C08J3/205C08J2327/18
    • To provide a filler-containing PTFE granular powder, which has a large apparent density, a small average particle size, a narrow particle size distribution, a superior powder flowability and a small electrostatic charge, and gives a molded product having a superior tensile strength and elongation, a lower surface roughness and a high whiteness, and a process for preparing the same. The granular powder is prepared by forming a PTFE powder and a filler into an aqueous slurry by using an organic liquid forming liquid-liquid interface with water and a nonionic surfactant having a hydrophobic segment and a hydrophilic segment, and then granulating in combination of stirring and deagglomerating.
    • 为了提供具有大的表观密度,小的平均粒度,窄的粒度分布,优异的粉末流动性和小的静电荷的含填料的PTFE粒状粉末,并且得到具有优异的拉伸强度和 伸长率,较低的表面粗糙度和较高的白度,及其制备方法。 通过使用与水形成液 - 液界面的有机液体和具有疏水链段和亲水链段的非离子表面活性剂,将PTFE粉末和填料形成为含水浆料,然后将搅拌和 解散。
    • 7. 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。