Lubricant composition in particular for limiting friction

Abstract

The present application relates to a lubricant composition comprising: at least one base oil; from 0.05 to 1.5% by weight of an organomolybdenum compound; and from 0.005 to 1% by weight of TiO 2 particles.

1 . Lubricant composition comprising:
 at least one base oil;   from 0.05 to 1.5% by weight of an organomolybdenum compound; and   from 0.005 to 1% by weight of TiO 2  particles.   
     
     
         2 . Composition according to  claim 1 , wherein the particles have an average size of between 10 nm and 1 μm. 
     
     
         3 . Composition according to  claim 1 , comprising from 0.08 to 1% by weight of organomolybdenum compound relative to the total weight of said composition. 
     
     
         4 . Composition according to  claim 1 , comprising from 0.01 to 0.8% by weight of titanium particles relative to the total weight of said composition. 
     
     
         5 . Composition according to  claim 1 , in which the organomolybdenum compound is chosen from organic complexes of molybdenum comprising at least one molybdenum (Mo) chemical element and at least one ligand chosen from carboxylate and ester, amide, dithiophosphate or dithiocarbamate ligands. 
     
     
         6 . Composition according to  claim 1 , wherein the organomolybdenum compound is chosen from organic complexes of molybdenum with amide ligands obtained by reaction:
 (i) a mono, di or tri glyceride fatty substance, or fatty acid,   (ii) an amine source of formula (A):   
       
         
           
           
               
               
           
         
         in which: 
         X 1  represents an oxygen atom or a nitrogen atom, 
         X 2  represents an oxygen atom or a nitrogen atom, 
         n or m represents 1 when X 1  or X 2  respectively represents an oxygen atom, 
         n or m represents 2 when X1 or X2 respectively represents a nitrogen atom, 
         (iii) and a molybdenum source selected from molybdenum trioxide or molybdates, preferably ammonium molybdate. 
       
     
     
         7 . Composition according to  claim 1 , wherein the organomolybdenum compound comprises at least one organic complex of molybdenum of formula (III) or (IV), alone or as a mixture: 
       
         
           
           
               
               
           
         
         in which:
 X 1  represents an oxygen atom or a nitrogen atom; 
 X 2  represents an oxygen atom or a nitrogen atom; 
 n represents 1 when X 1  represents an oxygen atom and m represents 1 when X 2  represents an oxygen atom; 
 n represents 2 when X 1  represents a nitrogen atom and m represents 2 when X 2  represents a nitrogen atom; 
 R 1  represents a linear or branched, saturated or unsaturated alkyl group comprising from 4 to 36 carbon atoms, preferably from 4 to 20 carbon atoms, advantageously from 6 to 18 carbon atoms; 
 
       
       
         
           
           
               
               
           
         
       
       in which:
 X 1  represents an oxygen atom or a nitrogen atom; 
 X 2  represents an oxygen atom or a nitrogen atom; 
 n represents 1 when X 1  represents an oxygen atom and m represents 1 when X 2  represents an oxygen atom; 
 n represents 2 when X 1  represents a nitrogen atom and m represents 2 when X 2  represents a nitrogen atom; 
 R 1  represents a linear or branched, saturated or unsaturated alkyl group comprising from 4 to 36 carbon atoms, preferably from 4 to 20 carbon atoms, advantageously from 6 to 18 carbon atoms; 
 R 2  represents a linear or branched, saturated or unsaturated alkyl group comprising from 4 to 36 carbon atoms, preferably from 4 to 20 carbon atoms, advantageously from 6 to 18 carbon atoms. 
 
     
     
         8 . Composition according to  claim 1 , wherein the organomolybdenum compound is selected from organic complexes of molybdenum with dithiophosphate ligands or organic complexes of molybdenum with dithiocarbamate ligands. 
     
     
         9 . Composition according to  claim 1 , wherein the organomolybdenum compound is a molybdenum dithiocarbamate compound (MoDTC). 
     
     
         10 - 12 . (canceled) 
     
     
         13 . Method for lubricating mechanical parts, in particular in an engine, in particular an internal combustion engine, comprising at least one step of contacting at least one part with a lubricant composition according to  claim 1 . 
     
     
         14 . Method for reducing friction in an engine, preferably internal combustion engine, for example vehicle engine, comprising at least one step of contacting at least one part of the engine with a lubricant composition according to  claim 1 . 
     
     
         15 . Method for reducing wear in an engine, preferably internal combustion engine for example vehicle engine, comprising at least one step of contacting at least one part of the engine with a lubricant composition according to  claim 1 .