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 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.
Abstract:
According to the invention there is provided a liquid friction control composition characterized as either having a high and positive friction characteristic or a low and neutral friction characteristic, comprising a retentivity agent. The liquid friction control composition may also comprise other components such as a solid lubricant, a wetting agent, a consistency modifier, and a preservative. The liquid friction control compositions may be used to modify the interfacial friction characteristics in sliding and rolling-sliding contact such as steel wheel-rail systems including mass transit and freight systems.
Abstract:
PROBLEM TO BE SOLVED: To provide a perfluoropolyether, a composition comprising the perfluoropolyether, a process for producing the perfluoropolyether, and a process for improving the thermostability of grease or lubricant.SOLUTION: A composition comprises a perfluoropolyether, which has the formula selected from the group consisting of F(CFO)CF(CF)CFX, XCFCF(CF)O(CFO)pRO(CFO)CF(CF)CFX, XCFCFO(CFO)CF(CF)CFX, (R)(R)CFO(CFO)CF(CF)CFX, and combinations of two or more thereof (wherein X is I or Br; x is a number from 2 to about 100; z is a number from about 5 to about 100; p is a number from 2 to about 50; n is a number from 2 to about 50; a is 1 or 2; each Ris independently a monovalent Cto Cbranched or linear fluoroalkane; and Ris a divalent Cto Cbranched or linear fluoroalkane).
Abstract translation:要解决的问题: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。 解决方案:组合物包含全氟聚醚,其具有选自F(C 3 SB> F 6 SB > O POS> CF(CF 3 SB>)CF 2 X,XCF CF(CF 3 SB>)O(C 3 SB> F 6 SB> O)pR f SB> 2 SP> O(C 3 SB> F 6 SB> O) n SB> CF(CF 3 SB> )CF 2 SB> X,XCF 2 SB> O(C 3 SB> O) X SB> CF(CF 3 SB>)CF 2 SB> X,(R f SB> 1 SP >)(R f SB> 1 SP>)CFO(C 3 SB> F 3 SB>)CF 2 X,以及其两种或更多种的组合(其中X为I或Br; x为2至约100的数; z为数 约5至约100; p是从2到约50的数字; n是从2到约50的数; a是1或2; 每个R f SB> 1 SP>独立地是C 1 SB> 支链或直链氟代烷烃; 并且R f SB> 2 SP>是C 1 SB> =支链或直链的氟烷烃)。 版权所有(C)2012,JPO&INPIT
Abstract:
PCT No. PCT/DE96/00344 Sec. 371 Date Aug. 25, 1997 Sec. 102(e) Date Aug. 25, 1997 PCT Filed Feb. 23, 1996 PCT Pub. No. WO96/26793 PCT Pub. Date Sep. 6, 1996In accordance with the method according to the invention, for the production of the plastics overlay, first of all a paste is made of a plastics dispersion and fillers. This paste is free of organic solvents and is applied to a sintered porous metal layer. The multilayer material thus produced is then sintered. Since the use of organic solvents is dispensed with, health risks and the risk of fire are reduced. Moreover, the composite materials produced according to the invention exhibit excellent cavitation resistance. In addition to conventional lubricant-free applications, such as bearings, these composite materials may consequently be used in particular in gear pumps and shock absorbers.
Abstract:
Silicone grease compositions are prepared by blending a thickening agent with a liquified crosslinked organosiloxane gel produced using a platinum-catalyzed hydrosilylation reaction. The gel is liquified by application of a shearing force to the crosslinked gel. The shearing force can be applied prior to and/or during blending of the gel with the thickener.