Polytetrafluoroethylene fine powders and their use
    31.
    发明授权
    Polytetrafluoroethylene fine powders and their use 失效
    聚四氟乙烯细粉及其用途

    公开(公告)号:US06503988B1

    公开(公告)日:2003-01-07

    申请号:US09051805

    申请日:1998-04-23

    IPC分类号: C08F11418

    摘要: A polytetrafluoroethylene fine powder excellent in powder flowability which comprises fine particles (the primary particle) having a mean particle diameter of 0.05 to 1 &mgr;m, an apparent density of 0.52 to 0.70 g/ml, a standard specific gravity (SSG) of 2.14 to 2.23, and a secondary mean particle diameter of 100 to 1000 &mgr;m, antidripping agent using the above polytetrafluoroethylene fine powder, flame resistive resin composition containing this powder, and composition for inhibiting dust characteristics containing this powder.

    摘要翻译: 粉末流动性优异的聚四氟乙烯细粉末,其包含平均粒径为0.05〜1μm的微粒(一次粒子),表观密度为0.52〜0.70g / ml,标准比重(SSG)为2.14〜2.23 ,二次平均粒径为100〜1000μmol,使用上述聚四氟乙烯细粉末的防毒剂,含有该粉末的阻燃树脂组合物和含有该粉末的粉尘特性抑制组合物。

    Preparation of sulphonic fluorinated polymer solutions
    33.
    发明授权
    Preparation of sulphonic fluorinated polymer solutions 有权
    磺化氟化聚合物溶液的制备

    公开(公告)号:US06197903B1

    公开(公告)日:2001-03-06

    申请号:US09281913

    申请日:1999-03-31

    IPC分类号: C08F11418

    CPC分类号: C08J3/091 C08J2327/12

    摘要: A process for preparing a solution and/or dispersion containing sulphonic (per)fluorinated ionomers having —SO3M functional groups, wherein M is selected from H, Li, Na, K, NR4 (R equal to or different from each other are selected from H, CH3, C2H5), characterized in that it dissolves the above defined ionomers at a temperature comprised between the room temperature and about 150° C., in a monophasic ternary mixture essentially constituted by water, by a C1-C4 alcohol and by a fluoro(poly)oxyalkylene having one hydrogen atom in at least a fluorinated end group; the dispersed polymer particle sizes are in the range 30-100 nm.

    摘要翻译: 一种制备含有具有-SO 3 M官能团的磺酸(全)氟化离聚物的溶液和/或分散体的方法,其中M选自H,Li,Na,K,NR4(R彼此相同或不同)选自H ,CH 3,C 2 H 5),其特征在于其在室温至约150℃之间的温度下,以基本上由水构成的单相三元混合物,C1-C4醇和氟 在至少氟化端基中具有一个氢原子的(聚)氧化烯; 分散的聚合物粒径在30-100nm的范围内。