Use of a succinimide compound as an anti-corrosion additive in a lubricant composition for a propulsion system of an electric or hybrid vehicle

Abstract

The invention relates to the use of at least one succinimide compound as an anti-corrosion additive in a lubricant composition for a propulsion system of an electric or hybrid vehicle, said lubricant composition comprising one or more amino and/or sulfur anti-wear additives. The invention also relates to the use of a lubricant composition for lubricating a propulsion system of an electric or hybrid vehicle.

1 - 10 . (canceled) 
     
     
         11 . A method or improving the anti-corrosion properties of a lubricant composition for a propulsion system of an electric or hybrid vehicle, comprising:
 adding at least one succinimide compound to a lubricant composition for lubricating the propulsion system, the lubricant composition comprising an amine-based anti-wear additive and/or a sulfur-based anti-wear additive.   
     
     
         12 . The method of  claim 11 , wherein the at least one succinimide compound is chosen from polyalkylene mono- or bis-succinimides; borate derivatives of polyalkylene mono- or bis-succinimides; succinic anhydride derivatives of polyalkylene mono- or bis-succinim ides; compounds obtained by opening such a succinic anhydride ring; or a combination thereof. 
     
     
         13 . The method of  claim 11 , wherein the at least one succinimide compound is chosen from: polyisobutene (PIB) mono- or bis-succinim ides; borate derivatives of polyisobutene (PIB) mono- or bis-succinimides; polyisobutylene succinic anhydrides (PIBSA); polyisobutylene pentaerythritol ester succinimides; or a combination thereof. 
     
     
         14 . The method of  claim 11 , wherein the at least one succinimide compound comprises at least one substituted succinimide group of formula (ii) below: 
       
         
           
           
               
               
           
         
         borate derivatives of formula (ii), 
         succinic anhydride derivatives of formula (ii), or 
         a compound obtained by opening of the succinic anhydride ring of formula (ii), 
         wherein R 1  represents a hydrocarbon-based group comprising from 8 to 400 carbon atoms. 
       
     
     
         15 . The method of  claim 14 , wherein R 1  represents a polyalkene group optionally linked to the succinimide group via a —(C═CH 2 )—group and having a mass-average molecular mass Mw of between 2000 and 30,000. 
     
     
         16 . The method of  claim 14 , wherein R 1  represents a polyisobutylene group optionally linked to the succinimide group via a —(C═CH 2 )—group and having a mass-average molecular mass Mw of between 2000 and 7000. 
     
     
         17 . The method of  claim 11 , wherein the at least one succinimide compound is a mono-succinimide of formula (II) below: 
       
         
           
           
               
               
           
         
         or a borate derivative thereof, 
         wherein: 
         R 1  represents a polyalkylene group optionally linked to the succinimide group via a —(C═CH 2 )—group; 
         A represents a linear or branched C 2  to C 6  alkylene group; and 
         y represents an integer ranging from 2 to 5. 
       
     
     
         18 . The method of  claim 17 , wherein:
 R 1  represents a polyisobutylene group optionally linked to the succinimide group via a —(C═CH 2 )—group;   A represents at least one of the following segments: —CH 2 —CH 2 —, —CH 2 —CH 2 —CH 2 —, —CH 2 —CH(CH 3 )—; and   y represents 2, 3, or 4.   
     
     
         19 . The method of  claim 11 , wherein the at least one succinimide compound is a bis-succinimide of formula (III) below: 
       
         
           
           
               
               
           
         
         or a borate derivative thereof, 
         wherein: 
         R 1  represents polyalkylene groups optionally linked to the succinimide group via a —(C═CH 2 )—group; 
         z represents an integer ranging from 1 to 10; and 
         s represents an integer ranging from 2 to 6. 
       
     
     
         20 . The method of  claim 19 , wherein:
 R 1  represents polyisobutylene groups optionally linked to the succinimide group via a —(C═CH 2 )—group;   z represents an integer ranging from 2 to 6; and   s represents an integer ranging from 2 to 4.   
     
     
         21 . The method of  claim 11 , wherein the amine-based anti-wear additive and/or the sulfur-based anti-wear additive is chosen from 2,5-dimercapto-1,3,4-thiadiazole derivatives having the following formulae, taken alone or as a mixture: 
       
         
           
           
               
               
           
         
         wherein: 
         each R 1  group is independently selected from a hydrogen atom, a linear or branched alkyl or alkenyl group comprising from 2 to 18 carbon atoms, or an aromatic substituent; and 
         each n is independently selected from 1, 2, 3, or 4. 
       
     
     
         22 . The method of  claim 21 , wherein:
 each R 1  group is independently selected from a hydrogen atom or linear or branched alkyl or alkenyl groups comprising from 8 to 12 carbon atoms or aromatic substituents; and   n is 1.   
     
     
         23 . The method of  claim 11 , wherein:
 the at least one succinimide compound is present in an amount ranging from 0.1% to 10% by mass, relative to the total mass of the lubricant composition; and   the amine-based anti-wear additive and/or the sulfur-based anti-wear additive is present in an amount ranging from 0.01% to 10% by mass, relative to the total mass of the lubricant composition.   
     
     
         24 . The method of  claim 23 , wherein:
 the at least one succinimide compound is present in an amount ranging from 0.5% to 8% by mass, relative to the total mass of the lubricant composition; and   the amine-based anti-wear additive and/or the sulfur-based anti-wear additive is present in an amount ranging from 0.5% to 3% by mass, relative to the total mass of the lubricant composition.   
     
     
         25 . A method of reducing corrosion in a propulsion system of an electric or hybrid vehicle, the method comprising lubricating an electric motor and/or power electronics of the electric or hybrid vehicle with a lubricant composition comprising:
 at least one succinimide compound; and   an amine-based anti-wear additive and/or a sulfur-based anti-wear additive.   
     
     
         26 . The method of  claim 25 , wherein:
 at least one succinimide compound is chosen from: polyisobutene (PIB) mono- or bis-succinimides; borate derivatives of polyisobutene (PIB) mono- or bis-succinimides; polyisobutylene succinic anhydrides (PIBSA); polyisobutylene pentaerythritol ester succinim ides; or a combination thereof; and   the amine-based anti-wear additive and/or the sulfur-based anti-wear additive is a 2,5-dimercapto-1,3,4-thiadiazole derivative.   
     
     
         27 . The method of  claim 25 , further comprising lubricating rolling bearings located between a rotor and a stator of the electric motor with the lubricant composition. 
     
     
         28 . The method of  claim 25 , further comprising lubricating a transmission of the electric or hybrid vehicle with the lubricant composition.