Use of a lubricant composition for reducing knocking

Abstract

The present disclosure relates to a lubricant composition including at least one base oil and at least one organic compound. The lubricant composition thus makes it possible to reduce, or even to eliminate knock in a vehicle engine, preferably a motor vehicle engine.

1 . A method for reducing knock in a vehicle engine, comprising bringing a mechanical part of the vehicle engine into contact with a lubricant composition comprising:
 at least one base oil;   at least one compound of formula (I):   
       
         
           
           
               
               
           
         
         in which:
 R1 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR7 group, an —NR8R9 group; 
 R2 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR10 group, an —NR11R12 group; 
 R3 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR13 group, an —NR14R15 group; 
 R4 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR16 group, an —NR17R18 group; 
 R5 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR19 group, an —NR2OR21 group; 
 R6 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR22 group, an —NR23R24 group; 
 R7, R10, R13, R16, R19 and R22, identical or different, represent independently a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms; 
 R8, R9, R11, R12, R14, R15, R17, R18, R20, R21, R23 and R24, identical or different, represent independently a hydrogen atom or a saturated or unsaturated, substituted or unsubstituted alkyl group, comprising from 1 to 3 carbon atoms; and 
 at least one of the R1, R2, R3, R4, R5 and R6 groups is different from a hydrogen atom. 
 
       
     
     
         2 . The method according to  claim 1  in which R1 represents:
 a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms; 
 an —OR7 group in which R7 represents a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms; and 
 an —NR8R9 group in which R8 and R9, identical or different, represent independently a hydrogen atom or a saturated or unsaturated, substituted or unsubstituted alkyl group, comprising from 1 to 3 carbon atoms 
 
     
     
         3 . The method according to  claim 1  in which R5 represents a hydrogen atom. 
     
     
         4 . The method according to  claim 1  in which R6 represents a hydrogen atom. 
     
     
         5 . The method according to  claim 1  in which R1 represents:
 a saturated, linear or branched alkyl group, comprising from 1 to 5 carbon atoms; 
 an —OR7 group in which R7 represents a saturated, linear or branched alkyl group, comprising from 1 to 5 carbon atoms; and 
 an —NR8R9 group in which:
 R8 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms; 
 R9 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms. 
 
 
     
     
         6 . The method according to  claim 1  in which R2 represents:
 a hydrogen atom; 
 a saturated, linear or branched alkyl group, comprising from 1 to 5 carbon atoms; 
 an —NR11R12 group in which:
 R11 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms; and 
 R12 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms. 
 
 
     
     
         7 . The method according to  claim 1  in which R3 represents:
 a hydrogen atom; 
 a saturated, linear or branched alkyl group, comprising from 1 to 5 carbon atoms; 
 an —NR14R15 group in which:
 R14 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms; and 
 R15 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms. 
 
 
     
     
         8 . The method according to  claim 1  in which R4 represents:
 a hydrogen atom; 
 a saturated, linear or branched alkyl group, comprising from 1 to 5 carbon atoms; 
 an —NR17R18 group in which:
 R17 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms; and 
 R18 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms. 
 
 
     
     
         9 . The method according to  claim 1  comprising a compound of formulae (Ia) to (If): 
       
         
           
           
               
               
           
         
         in which:
 R1 represents a saturated, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR7 group, an —NR8R9 group; 
 R2 represents a hydrogen atom, a saturated, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR10 group, an —NR11R12 group; 
 R3 represents a hydrogen atom, a saturated, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR13 group, an —NR14R15 group; 
 R4 represents a hydrogen atom, a saturated, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR16 group, an —NR17R18 group; 
 R7, R10, R13 and R16, identical or different, represent independently a saturated, linear or branched alkyl group, comprising from 1 to 10 carbon atoms; and 
 R8, R9, R11, R12, R14, R15, R17 and R18, identical or different, represent independently a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms. 
 
       
     
     
         10 . The method according to  claim 9  comprising a compound of formulae (Ia) to (Ic) in which:
 R1 represents an —OR7 group in which R7 represents a saturated alkyl group comprising from 1 to 3 carbon atoms; 
 R2 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms; 
 R3 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms; and 
 R4 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms. 
 
     
     
         11 . The method according to  claim 9  comprising a compound of formulae (Ia) to (Ic) in which:
 R1 represents an —NR8R9 group in which:
 R8 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms; 
 R9 represents a hydrogen atom or a saturated alkyl group, comprising from 1 to 3 carbon atoms; 
 
 R2 represents a hydrogen atom, a saturated alkyl group comprising from 1 to 3 carbon atoms or an —NH 2  group; 
 R3 represents a hydrogen atom, a saturated alkyl group comprising from 1 to 3 carbon atoms or an —NH 2  group; and 
 R4 represents a hydrogen atom, a saturated alkyl group comprising from 1 to 3 carbon atoms or an —NH 2  group. 
 
     
     
         12 . The method according to  claim 9  comprising a compound of formulae (Ia) to (Ic) in which:
 R1 represents a saturated, linear or branched alkyl group, comprising from 1 to 5 carbon atoms; 
 R2 represents a hydrogen atom or a saturated, linear or branched alkyl group, comprising from 1 to 5 carbon atoms; 
 R3 represents a hydrogen atom or a saturated, linear or branched alkyl group, comprising from 1 to 5 carbon atoms; and 
 R4 represents a hydrogen atom or a saturated, linear or branched alkyl group, comprising from 1 to 5 carbon atoms. 
 
     
     
         13 . The method according to  claim 1  in which the content by weight of the compound of formula (I) ranges from 0.5 to 25% with respect to the total weight of the lubricant composition. 
     
     
         14 . The method according to  claim 1  further comprising at least one additive selected from the detergents, friction modifiers, dispersants, anti-wear additives, extreme-pressure additives, antioxidants, viscosity index improver polymers, flow point improvers, anti-foaming agents, thickeners and mixtures thereof. 
     
     
         15 . A method for reducing knock in a vehicle engine, comprising:
 a) adding at least one base oil to a composition of the additive-concentrate type in order to obtain a lubricant composition comprising;   b) bringing a mechanical part of the vehicle engine into contact with the lubricant composition;   c) the composition of the additive-concentrate type comprising:
 at least one compound of formula (I): 
   
       
         
           
           
               
               
           
         
         in which:
 R1 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR7 group, an —NR8R9 group; 
 R2 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR10 group, an —NR11R12 group; 
 R3 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR13 group, an —NR14R15 group; 
 R4 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR16 group, an —NR17R18 group; 
 R5 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR19 group, an —NR2OR21 group; 
 R6 represents a hydrogen atom, a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms, an —OR22 group, an —NR23R24 group; 
 R7, R10, R13, R16, R19 and R22, identical or different, represent independently a saturated or unsaturated, substituted or unsubstituted, linear or branched alkyl group, comprising from 1 to 10 carbon atoms; 
 R8, R9, R11, R12, R14, R15, R17, R18, R20, R21, R23 and R24, identical or different, represent independently a hydrogen atom or a saturated or unsaturated, substituted or unsubstituted alkyl group, comprising from 1 to 3 carbon atoms; 
 at least one of the R1, R2, R3, R4, R5 and R6 groups is different from a hydrogen atom; and 
 
         at least one additive selected from the detergents, friction modifiers, anti-wear additives, dispersants, extreme-pressure additives, antioxidants, viscosity index improver polymers, flow point improvers, anti-foaming agents, thickeners and mixtures thereof. 
       
     
     
         16 . The method according to  claim 1 , in which compound of formula (I) is selected from the group consisting of ortho-toluidine, meta-toluidine and para-toluidine.