会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 4. 发明申请
    • Directly polymerized low molecular weight granular polytetrafluoroethylene
    • 直接聚合低分子量粒状聚四氟乙烯
    • US20050182216A1
    • 2005-08-18
    • US10685789
    • 2003-10-15
    • Richard Morgan
    • Richard Morgan
    • C08F6/24C08F14/18C08F14/26C08F114/26
    • C08F6/24C08F14/26C08F114/26C08L27/18C08F2/18
    • A process for producing low molecular weight, granular polytetrafluoroethylene or modified polytetrafluoroethylene by suspension polymerization of pressurized tetrafluoroethylene in an agitated reaction vessel. The polymerization is conducted in aqueous medium in the presence of a free radical initiator, and a telogen. The reaction vessel is agitated during polymerization sufficiently to coagulate the polytetrafluoroethylene or modified polytetrafluoroethylene. Low molecular weight granular polytetrafluoroethylene or modified polytetrafluoroethylene having a melt viscosity of less than about 1×106 Pa.S powder is isolated directly from the reaction vessel. The low molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene powder in accordance with the invention has a melt viscosity of less than about 1×106 Pa.S, a specific surface area of less than about 8 m2/g, an extractable fluoride level of about 3 ppm or less by weight, and a narrow molecular weight distribution as indicated by a polydispersity index of about 5 or less. The particles of low molecular powder have a weight average particle size of about 2 to about 40 micrometers and the powder is substantially free of particles having a particle size of less than about 1 micrometer. The low molecular weight material so produced suitable for use as additives to other materials such as inks, coatings, greases, lubricants, and plastics.
    • 通过加压四氟乙烯在搅拌反应容器中的悬浮聚合制备低分子量粒状聚四氟乙烯或改性聚四氟乙烯的方法。 聚合反应在水性介质中在自由基引发剂存在下进行。 反应容器在聚合过程中被充分搅拌以使聚四氟乙烯或改性聚四氟乙烯凝结。 具有小于约1×10 -6 PaSS粉末的低分子量粒状聚四氟乙烯或改性聚四氟乙烯直接从反应容器中分离出来。 根据本发明的低分子量聚四氟乙烯或改性聚四氟乙烯粉末的熔体粘度小于约1×10 6 Pa,比表面积小于约8μm2, 大约3ppm或更少的可提取的氟化物含量,和由多分散指数为约5或更小所示的窄分子量分布。 低分子粉末的颗粒具有约2至约40微米的重均粒径,粉末基本上不含粒度小于约1微米的颗粒。 如此生产的低分子量材料适用于其他材料(如油墨,涂料,润滑脂,润滑剂和塑料)的添加剂。