Conductive lubricating greases

Abstract

The present invention relates to the use of a salicylate additive for increasing the electrical conductivity of a grease composition comprising at least one base oil and at least one thickener. The invention also relates to a grease composition comprising at least one base oil. at least one polyurea thickener and at least one salicylate additive.

1 - 14 . (canceled) 
     
     
         15 . A method for increasing the electrical conductivity of a grease composition, said method comprising a step of mixing at least one salicylate additive with at least one base oil and at least one thickener. 
     
     
         16 . The method according to  claim 15 , wherein the thickener is chosen from fatty acid metal salts and polyureas. 
     
     
         17 . The method according to  claim 15 , wherein the salicylate additive is chosen from metal salicylate salts. 
     
     
         18 . The method according to  claim 17 , wherein the metal salt of the salicylate is selected from calcium salts, sodium salts, lithium salts, barium salts, magnesium salts, zinc salts. 
     
     
         19 . The method according to  claim 15 , wherein the salicylate additive is chosen from salicylates, disalicylates, alkylsalicylates and dialkylsalicylates. 
     
     
         20 . The method according to  claim 15 , wherein the salicylate additive is chosen from metal salicylate salts comprising from 1 to 10% by weight of metal, relative to the total weight of the salicylate additive. 
     
     
         21 . The method according to  claim 15 , wherein the salicylate additive is chosen from overbased calcium alkylsalicylates. 
     
     
         22 . The method according to  claim 15 , wherein the salicylate additive is added in a concentration ranging from 0.1 to 10% by weight relative to the total weight of the grease composition after addition of the salicylate additive. 
     
     
         23 . A grease composition comprising, with respect to the total weight of the grease composition:
 from 70 to 95% by weight of base of oil(s),   from 4 to 20% by weight of thickener(s) chosen from polyureas,   from 0.1 to 10% by weight of additive salicylate(s).   
     
     
         24 . The grease composition according to  claim 23 , wherein the salicylate additive comprises one or more of the following features:
 the salicylate additive is chosen from metal salicylate salts,   the salicylate additive is chosen from salicylates, disalicylates, alkylsalicylates and dialkylsalicylates,   the salicylate additive is chosen from metal salicylate salts comprising from 1 to 10% by weight of metal, relative to the total weight of the salicylate additive,   the salicylate additive is chosen from overbased calcium alkylsalicylates.   
     
     
         25 . The grease composition according to  claim 23 , having a resistivity at 100° C. of less than or equal to 1.0×10 8  ohm·meters. 
     
     
         26 . The grease composition according to  claim 23 , comprising:
 from 75 to 90% by weight of base oil(s)   from 5 to 15% by weight of thickener chosen from polyureas,   from 0.5 to 5% by weight of metal salicylate additive(s) chosen from salicylates, alkylsalicylates, disalicylates and dialkylsalicylates.   
     
     
         27 . The grease composition according to  claim 23 , said composition comprising, relative to the total weight of the grease composition, less than 1% by weight of calcium 12-hydroxystearate and less than 1% by weight of calcium stearate. 
     
     
         28 . The grease composition according to  claim 23 , characterized in that same is free of calcium 12-hydroxystearate and free of calcium stearate. 
     
     
         29 . The method according to  claim 15 , wherein the thickener is chosen from polyureas. 
     
     
         30 . The method according to  claim 15 , wherein the thickener is chosen from diureas. 
     
     
         31 . The method according to  claim 15 , wherein the salicylate additive is added in a concentration ranging from 0.5 to 5% by weight, relative to the total weight of the grease composition after addition of the salicylate additive. 
     
     
         32 . The grease composition according to  claim 23 , comprising:
 from 75 to 90% by weight of base oil(s)   from 5 to 15% by weight of thickener chosen from polyureas,   from 0.5 to 5% by weight of metal salicylate additive(s) chosen from salicylates, alkylsalicylates, disalicylates and dialkylsalicylates, the alkyl moieties including from 1 to 24 carbon atoms and the metal concentration ranging from 0.1 to 15% by weight relative to the total weight of the salicylate additive.   
     
     
         33 . The grease composition according to  claim 23 , said composition comprising, relative to the total weight of the grease composition, less than 0.1% by weight of calcium 12-hydroxystearate and less than 0.1% by weight of calcium stearate. 
     
     
         34 . A method for increasing the electrical conductivity of a grease composition, comprising at least one base oil and at least one thickener, said method comprising a step of using at least one salicylate additive.