Patent ID: 8258088

Claim:
A lubricating grease composition consisting of a mixture of (a) 5 to 95 wt % base oil based on oils with a standard viscosity for industrial lubricants, consisting of an ester of an aromatic or aliphatic di-, tri- or tetracarboxylic acid with one or a mixture of C 7 to C 22 alcohols consisting of a polyphenyl ether or alkylated diphenyl ether, an ester of trimethylolpropane, pentaerythritol or dipentaerythritol with aliphatic C 7 to C 22 carboxylic acids, C 18 dimer acid esters with C 7 to C 22 alcohols, complex esters as individual components or in any mixture, or selected from poly-α-olefins, alkylated naphthalenes, alkylated benzenes, polyglycols, silicone oils, perfluoro polyethers, (b) 1 to 10 wt % ionic liquid or a mixture of ionic liquids selected from the group consisting of butylmethylpyrrolidinium bis(trifluoromethylsulfonyl)imide, trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide, 1-ethyl-3-methylimidazolium ethyl sulfate, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and N-ethyl-3-methylpyridinium nonafluorobutanesulfonate, (c) 3 to 50 wt % thickening agent selected from the group consisting of a reaction product of a diisocyanate selected from the group consisting of 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, and 4,4′-diisocyanatodiphenylmethane, which may be used individually or in combination, with an amine of the general formula R′ 2 N—R, where R is an aryl, alkyl or alkylene radical with 2 to 22 carbon atoms and R′ is identical or different hydrogen, an alkyl, alkylene or aryl radical, metal soaps and metal complex soaps, and (d) 0.1 to 10 wt % conventional additives individually or in combination, selected from the group consisting of corrosion preventives, oxidation preventives, wear preventives, friction reducing agents, agents to protect against metal effects, UV stabilizers, organic or inorganic solid lubricants selected from polyimide, polytetrafluoroethylene (PTFE), graphite, metal oxides, boron nitride, molybdenum sulfide and phosphate.