Method to refine lubricant for a magnetic recording medium
    186.
    发明授权
    Method to refine lubricant for a magnetic recording medium 有权
    改善磁记录介质润滑剂的方法

    公开(公告)号:US07199087B2

    公开(公告)日:2007-04-03

    申请号:US10620773

    申请日:2003-07-17

    Abstract: A method refines a lubricant comprising a compound having a perfluoropolyether structure via supercritical extraction. A lubricant is refined using the method and a magnetic recording medium that utilizes the refined lubricant. The refined lubricant exhibits excellent lubrication performance and long term stability in the magnetic recording medium. In one embodiment of the supercritical extraction, the lubricant contacts an extracting medium of supercritical carbon dioxide under a predetermined condition in a pressure vessel to remove ionic impurities and perfluoropolyether compounds having a weak polarity terminal group contained in the lubricant.

    Abstract translation: 一种方法通过超临界萃取来提炼含有具有全氟聚醚结构的化合物的润滑剂。 使用该方法精炼润滑剂和利用精制润滑剂的磁记录介质。 精炼润滑剂在磁记录介质中表现出优异的润滑性能和长期稳定性。 在超临界萃取的一个实施方案中,润滑剂在预定条件下在压力容器中与超临界二氧化碳的萃取介质接触以除去润滑剂中含有的极性极性极弱的离子杂质和全氟聚醚化合物。

    Thermally stable perfluoropolyethers and processes therefor and therewith
    189.
    发明申请
    Thermally stable perfluoropolyethers and processes therefor and therewith 有权
    热稳定的全氟聚醚及其工艺及其

    公开(公告)号:US20030027732A1

    公开(公告)日:2003-02-06

    申请号:US09901975

    申请日:2001-07-10

    Abstract: A perfluoropolyether, a composition comprising the perfluoropolyether, a process for producing the perfluoropolyether, and a process for improving the thermostability of grease or lubricant are provided. The perfluoropolyether comprises perfluoroalkyl radical end groups in which the radical has at least 3 carbon atoms per radical and is substantially free of perfluoromethyl and perfluoroethyl end groups. The process for producing the perfluoropolyether can comprise (1) contacting a perfluoro acid halide, a C2- to C4-substituted ethyl epoxide, or a C3null fluoroketone with a metal halide to produce an alkoxide; (2) contacting the alkoxide with either hexafluoropropylene oxide or tetrafluorooxetane to produce a second acid halide; (3) esterifying the second acid halide to an ester; (4) reducing the ester to its corresponding alcohol; (5) converting the alcohol with a base to a salt form; (6) contacting the salt form with a C3 or higher olefin to produce a fluoropolyether; and (7) fluorinating the fluoropolyether. The process for improving the thermostability of a grease or lubricant comprises combining the grease or lubricant with the composition.

    Abstract translation: 提供全氟聚醚,包含全氟聚醚的组合物,制备全氟聚醚的方法以及改善润滑脂或润滑剂的热稳定性的方法。 全氟聚醚包括全氟烷基自由基端基,其中基团每个基团具有至少3个碳原子,并且基本上不含全氟甲基和全氟乙基端基。 制备全氟聚醚的方法可以包括(1)使全氟酰卤,C 2 -C 4取代的乙基环氧化物或C 3+氟代酮与金属卤化物接触以产生醇盐; (2)使醇盐与六氟环氧丙烷或四氟氧杂环丁烷接触以产生第二种酰卤; (3)将第二酰卤酯化为酯; (4)将酯还原成相应的醇; (5)将醇与碱转化为盐形式; (6)使盐形式与C3或更高级烯烃接触以产生含氟聚醚; 和(7)氟化聚醚醚。 用于改善润滑脂或润滑剂的热稳定性的方法包括将润滑脂或润滑剂与组合物组合。

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