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    • 8. 发明授权
    • Thermally stable perfluoropolyethers and processes therefor and therewith
    • 热稳定的全氟聚醚及其工艺及其
    • US07232932B2
    • 2007-06-19
    • US10813525
    • 2004-03-30
    • Jon L. HowellErik William PerezAlfred WaterfeldChadron Mark FriesenJoseph Stuart Thrasher
    • Jon L. HowellErik William PerezAlfred WaterfeldChadron Mark FriesenJoseph Stuart Thrasher
    • C43C43/12C08F8/00
    • C10M107/38C10M2213/0606C10N2230/08C10N2250/10C10N2270/00
    • 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 C3+ 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.
    • 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反应生成醇盐; (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C 3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。