Diester-based lubricant composition

Abstract

The present invention relates to a lubricating composition comprising: one or a plurality of diesters, each of said diesters being formed between: a diol chosen from 1,2-propanediol, 1,2-decanediol and 1,3-diols having from 3 to 10 carbon atoms, andtwo monocarboxylic acids, identical or different, having a linear or branched hydrocarbon chain having from 4 to 10 carbon atoms, andat least one base oil distinct from the diester and/or at least one additive distinct from the diester, said additive being selected from friction modifier additives, anti-wear additives, extreme pressure additives, detergents, antioxidants, viscosity index (VI) improvers, pour point depressants (PPD), dispersants, anti-foam agents, thickeners, corrosion inhibitors, copper passivating agents, and mixtures thereof.

1 . A lubricating composition comprising:
 One or a plurality of diesters, each of said diesters being formed between:
 a diol selected from 1,2-propanediol, 1,2-decanediol and 1,3-diols having from 3 to 10 carbon atoms, and 
 two monocarboxylic acids, identical or different, having a linear or branched hydrocarbon chain having from 4 to 10 carbon atoms, said hydrocarbon chain optionally being interrupted by one or a plurality of heteroatoms, and 
   at least one base oil distinct from the diester and/or at least one additive distinct from the diester, said additive being selected from friction modifier additives, anti-wear additives, extreme pressure additives, detergents, antioxidants, viscosity index (VI) improvers, pour point depressants (PPD), dispersants, anti-foam agents, thickeners, corrosion inhibitors, copper passivating agents, and mixtures thereof.   
     
     
         2 . The lubricating composition according to  claim 1 , wherein the linear or branched hydrocarbon chain having from 4 to 10 carbon atoms is a linear or branched, saturated or unsaturated alkyl or alkylene chain consisting of carbon and hydrogen atoms. 
     
     
         3 . The lubricating composition according to  claim 1 , comprising:
 from 5 to 95% by weight of said diester or diesters,   from 1 to 95% by weight of one or a plurality of base oils different from said diesters,   optionally, from 0.01 to 20% by weight of one or a plurality of additives distinct from the diester and distinct from the base oil(s),   with respect to the total weight of the composition.   
     
     
         4 . The lubricating composition according to one of  claim 1 , comprising:
 at least 5% by weight of one or a plurality of diesters;   from 0.01 to 20% by weight of one or a plurality of additives chosen from friction modifier additives, anti-wear additives, extreme pressure additives, detergents, antioxidants, viscosity index (VI) improvers, pour point depressant additives (PPD), dispersants, anti-foam agents, thickeners, copper thickening agents, corrosion inhibitors and mixtures thereof; and   optionally, from 5 to 94% by weight of base oil(s) distinct from the diester according to the invention,   with respect to the total weight of the composition.   
     
     
         5 . The lubricating composition according to  claim 1 , wherein said diester has from 13 to 25 carbon atoms. 
     
     
         6 . The lubricating composition according to  claim 1 , wherein said diester has a kinematic viscosity at 100° C. ranging from 1 to 6 mm 2 /s. 
     
     
         7 . The lubricating composition according to  claim 1 , wherein the diol is chosen from 1,2-propanediol, 1,2-decanediol and 1,3-alkanediol having from 3 to 7 carbon atoms. 
     
     
         8 . The lubricating composition according to  claim 1 , wherein said monocarboxylic acids, either identical or different, include a linear hydrocarbon chain having from 4 to 10 carbon atoms. 
     
     
         9 . The lubricating composition according to  claim 1 , wherein said diester(s) is (are) chosen from:
 the diesters formed between:
 a diol selected from 1,2-decanediol and 1,3-propanediol, and 
 two monocarboxylic acids, identical or different, having a linear or branched hydrocarbon chain having from 4 to 10 carbon atoms, said hydrocarbon chain optionally being interrupted by one or a plurality of heteroatoms, 
   a diester formed from 1,2-propanediol and two heptanoic acids,   a diester formed from 1,2-propanediol and two octanoic acids,   a diester formed from 1,2-propanediol and two decanoic acids,   a diester formed from 1,2-propanediol and an octanoic acid and a decanoic acid,   and mixtures thereof.   
     
     
         10 . A lubricating composition according to  claim 1 , wherein said diester(s) is (are) chosen from:
 a diester formed from 1,2-decanediol and two heptanoic acids,   a diester formed from 1,2-decanediol and two pentanoic acids,   a diester formed from 1,2-propanediol and two heptanoic acids,   a diester formed from 1,2-propanediol and two nonanoic acids,   a diester formed from 1,3-propanediol and two heptanoic acids,   a diester formed from 1,2-propanediol and two octanoic acids,   a diester formed from 1,2-propanediol and two decanoic acids,   a diester formed from 1,2-propanediol and an octanoic acid and a decanoic acid,   and mixtures thereof.   
     
     
         11 . A method of lubricating and/or cooling at least one part of a mobile or stationary system comprising bringing into contact with said part a lubricating composition comprising at least one diester,
 said diester being formed between:
 a diol selected from 1,2-propanediol, 1,2-decanediol and 1,3-diols having from 3 to carbon atoms, and 
 two monocarboxylic acids, identical or different, having a linear or branched hydrocarbon chain having from 4 to 10 carbon atoms, said hydrocarbon chain optionally being interrupted by one or a plurality of heteroatoms, 
   said lubricating composition further comprising at least one base oil distinct from the diester and/or at least one additive distinct from the diester, said additive being selected from friction modifier additives, anti-wear additives, extreme pressure additives, detergents, antioxidants, viscosity index (VI) improvers, pour point depressants (PPD), dispersants, anti-foam agents, thickeners, corrosion inhibitors, copper passivating agents, and mixtures thereof.   
     
     
         12 . The method according to  claim 11 , wherein the mobile or stationary system is chosen e.g. from a heavy or light vehicle, a public works vehicle, and an energy storage system. 
     
     
         13 . The method according to claim  112 , wherein the mobile system is a vehicle equipped with a transmission component lubricated by means of the composition, said method comprising reducing the fuel consumption of said vehicle. 
     
     
         14 . The method according to  claim 11 , wherein the composition comprises one or more of the following features:
 the linear or branched hydrocarbon chain having from 4 to 10 carbon atoms is a linear or branched, saturated or unsaturated alkyl or alkylene chain consisting of carbon and hydrogen atoms;   the composition comprises:
 from 5 to 95% by weight of said diester or diesters. 
 from 1 to 95% by weight of one or a plurality of base oils different from said diesters, 
 optionally, from 0.01 to 20% by weight of one or a plurality of additives distinct from the diester and distinct from the base oil(s), 
 with respect to the total weight of the composition; 
   the diester has from 13 to 25 carbon atoms;   the diol is chosen from 1,2-propanediol, 1,2-decanediol and 1,3-alkanediol having from 3 to 7 carbon atoms;   the monocarboxylic acids, either identical or different, include a linear hydrocarbon chain having from 4 to 10 carbon atoms;   the diester(s) is (are) chosen from:
 the diesters formed between:
 a diol selected from 1,2-decanediol and 1,3-propanediol, and 
 two monocarboxylic acids, identical or different, having a linear or branched hydrocarbon chain having from 4 to 10 carbon atoms, said hydrocarbon chain optionally being interrupted by one or a plurality of heteroatoms, 
 
 a diester formed from 1,2-propanediol and two heptanoic acids, 
 a diester formed from 1,2-propanediol and two octanoic acids, 
 a diester formed from 1,2-propanediol and two decanoic acids, 
 a diester formed from 1,2-propanediol and an octanoic acid and a decanoic acid, 
 and mixtures thereof; 
   the diester(s) is (are) chosen from:
 a diester formed from 1,2-decanediol and two heptanoic acids, 
 a diester formed from 1,2-decanediol and two pentanoic acids, 
 a diester formed from 1,2-propanediol and two heptanoic acids, 
 a diester formed from 1,2-propanediol and two nonanoic acids, 
 a diester formed from 1,3-propanediol and two heptanoic acids, 
 a diester formed from 1,2-propanediol and two octanoic acids, 
 a diester formed from 1,2-propanediol and two decanoic acids, 
 a diester formed from 1,2-propanediol and an octanoic acid and a decanoic acid 
 and mixtures thereof. 
   
     
     
         15 . The lubricating composition according to  claim 1 , wherein said diester has a kinematic viscosity at 100° C. ranging from 1 to 4 mm 2 /s.