Lubricating grease composition

A lubricating grease composition consisting of a mixture of

• (a) 5 to 95 wt % base oil based on oils with the 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 C7 to C22 alcohols consisting of a polyphenyl ether or alkylated diphenyl ether, an ester of trimethylolpropane, pentaerythritol or dipentaerythritol with aliphatic C7 to C22 carboxylic acids, C18 dimer acid esters with C7 to C22 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 30 wt % ionic liquid or a mixture of several ionic liquids containing as the cation a phosphonium cation, imidazolium cation, pyridinium cation or pyrrolidinium cation
• and whose anion contains fluorine and is selected from the group consisting of bis(trifluoromethylsulfonyl)imide, bis(perfluoroalkylsulfonyl)imide, perfluoroalkylsulfonate, tris(perfluoroalkyl)methidenes, bis(perfluoroalkyl)imidenes, bis(perfluoroaryl)imides, perfluoroarylperfluoroalkyl sulfonylimides and tris(perfluoroalkyl)trifluorophosphate or their anion from a halogen-free alkyl sulfate,
• (c) 3 to 50 wt % thickening agent selected from the group consisting of
• a reaction product of a diisocyanate, preferably 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, 4,4′-diisocyanatodiphenylmethane, 2,4′-diisocyanatodiphenylmethane, 4,4′-diisocyanatodiphenyl, 4,4′-diisocyanato-3,3′-dimethyldiphenyl, 4,4′-diisocyanato-3,3′-dimethylphenylmethane which may be used individually or in combination, with an amine of the general formula R′2N—R or a diamine of the general formula R′2N—R—N—R′2 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, or with a mixture of amines and diamines
• or
• of metal soaps, metal sulfonates, metal complex soaps, bentonite, silicate powder, polytetrafluoroethylene (PTFE), polyamide, polyimide
• 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.