Patent ID: 6265362
Filing Date: 2001-07-24
Classification: C10M,C10N

Abstract:
A lubricating grease composition comprising a mixture of(a) a hydrocarbon-based oil, which is an ester of an aromatic tri- or tetracarboxylic acid with one or more C.sub.7 - to C.sub.22 -alcohols, a polyphenyl ether or alkylated polyphenyl ether, an ester of trimethylolpropane, pentaerythritol or dipentaerythritol with an aliphatic C.sub.7 - to C.sub.22 -carboxylic acid, C.sub.18 -dimer acid ester with a C.sub.7 - to C.sub.22 -alcohol, or a complex ester, as an individual component or as a mixture,(b) a perfluoro-polyalkyl ether oil of the formulaA'--(O--CF.sub.2).sub.v --(O--C.sub.2 F.sub.4).sub.w --(O--C.sub.3 F.sub.6).sub.x --(O--C.sub.4 F.sub.8).sub.y --(O--CF.sub.2 CF(CF.sub.3)).sub.z --O--A""in whichA' is --CF.sub.3, --C.sub.2 F.sub.5, --C.sub.3 F.sub.7, or --CF.sub.2 T, where T is H or Cl,A"" is A' or --CF.sub.3, --C.sub.2 F.sub.5, --C.sub.3 F.sub.7, or --CF.sub.2 T, where T is H or Cl, andv, w, x, y and z are whole numbers .gtoreq.O,(c) a dicarbamide as a thickening agent, which is the reaction product of a di-isocyanate and an amine of the formula (H.sub.2 N).sub.x R, whereby R is an alkyl radical with 6 to 22 carbon atoms or an aryl radical with 6 to 12 carbon atoms and x is 1,(d) a conventional grease additive and(e) an organic or inorganic solid lubricant selected from the group consisting of polyimides, PTFE, graphite, metal oxides, boron nitride, molybdenum disulfide and phosphates.