Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
  • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/02—Well-defined aliphatic compounds
  • C10M2203/024—Well-defined aliphatic compounds unsaturated
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/102—Aliphatic fractions
  • C10M2203/1025—Aliphatic fractions used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
  • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
  • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
  • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/08—Amides
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/08—Amides
  • C10M2215/082—Amides containing hydroxyl groups; Alkoxylated derivatives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
  • C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
  • C10M2219/066—Thiocarbamic type compounds
  • C10M2219/068—Thiocarbamate metal salts
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
  • C10M2223/045—Metal containing thio derivatives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
  • C10M2223/047—Thioderivatives not containing metallic elements
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
  • C10M2227/09—Complexes with metals
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/12—Groups 6 or 16
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/54—Fuel economy
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/25—Internal-combustion engines
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2070/00—Specific manufacturing methods for lubricant compositions
  • C10N2070/02—Concentrating of additives
• • C10N2230/06—
• • C10N2230/54—
• • C10N2240/10—

Definitions

• the present invention is applicable to the field of lubricants, in particular lubricants for engines, and more particularly for motor vehicle engines. More particularly, the present invention relates to a lubricant composition comprising at least one base oil, at least one organomolybdenum compound, at least one compound comprising a dithiophosphate group and at least one fatty triamine.
• the lubricant composition according to the invention has good friction properties for both steel/steel contacts, and steel/carbon coating contacts as well as for carbon coating/carbon coating contacts, whilst retaining good anti-wear properties.
• the present invention also relates to a lubrication process utilizing this composition.
• the present invention also relates to a process for reducing friction between two steel surfaces, in particular in an engine, and more particularly in a motor vehicle engine.
• the present invention also relates to a process for reducing friction between a steel surface and a carbon-covered surface, in particular in an engine, and more particularly in a motor vehicle engine.
• the present invention also relates to a process for reducing friction between two carbon-covered surfaces, and more particularly in a motor vehicle engine.
• the present invention also relates to a process for reducing the fuel consumption of a vehicle, and more particularly of a motor vehicle.
• the present invention also relates to the use of a fatty triamine in a lubricant composition for reducing friction between two steel surfaces, in particular in an engine, and more particularly in a motor vehicle engine.
• the present invention also relates to the use of a fatty triamine in a lubricant composition for reducing friction between a steel surface and a carbon-covered surface, in particular in an engine, and more particularly in a motor vehicle engine.
• the present invention also relates to the use of a fatty triamine in a lubricant composition for reducing friction between two carbon-covered surfaces, in particular in an engine, and more particularly in a motor vehicle engine.
• the present invention also relates to the use of a fatty triamine in a lubricant composition for reducing the fuel consumption of a vehicle, and more particularly of a motor vehicle.
• the present invention also relates to a composition of the additives concentrate type comprising at least one organomolybdenum compound, at least one compound comprising a dithiophosphate group and at least one fatty triamine.
• the objective of lubricants is to reduce the phenomena of friction and wear of the mechanical parts, in particular in vehicle engines, and more particularly in motor vehicle engines.
• the organomolybdenum compounds represent a family of compounds, the friction phenomenon reduction properties of which have been broadly described, and more particularly with respect to contacts between two steel surfaces.
• organomolybdenum compounds in particular of organomolybdenum compounds comprising a dithiocarbamate group, can cause worsening of the phenomena of wear of mechanical parts.
• an organomolybdenum compound and an anti-wear compound such as a compound comprising a dithiophosphate group in a lubricant composition has been broadly described.
• the DLC coatings are used as coatings of the surfaces of vehicle engine parts, and in particular motor vehicle engine parts.
• the properties of reduction of the friction phenomena of a carbon coating, and in particular of a DLC coating can be altered, or even degraded in the presence of a lubricant.
• the organomolybdenum compounds present in a lubricant can cause a carbon coating present on a surface to become degraded or even to peel off, and this degradation can be exacerbated as the organomolybdenum compounds content in the lubricant increases.
• lubricants that are compatible with surfaces covered with a carbon material, and in particular a DLC coating or a nanodiamond coating, these lubricants comprising no organomolybdenum compounds.
• the document EP 2479247 describes a lubricant comprising a compound based on a zinc phosphate compound and a sulphur-containing compound.
• the document EP 1338641 describes a lubricant comprising an amine as friction modifier compatible with a surface having a DLC coating.
• this document gives no teaching about the friction phenomena reduction properties of these lubricants for steel/steel contacts.
• this document gives no teaching about the anti-wear properties of these lubricants, either for steel/steel or steel/carbon coating contacts.
• An object of the invention is therefore a lubricant composition
• a lubricant composition comprising:
• the applicant has found that the presence of at least one organomolybdenum compound, at least one compound comprising a dithiophosphate group and at least one fatty triamine in a lubricant composition makes it possible to give the lubricant composition good friction properties for steel/steel contacts, steel/carbon coating contacts and carbon coating/carbon coating contacts simultaneously.
• the present invention makes it possible to formulate lubricant compositions comprising an optimized organomolybdenum compound content and having good friction properties for steel/steel contacts and steel/carbon coating contacts as well as for carbon coating/carbon coating contacts.
• the lubricant compositions according to the invention have good friction properties for steel/steel contacts, steel/carbon coating contacts and carbon coating/carbon coating contacts, whilst retaining good anti-wear properties.
• the lubricant compositions according to the invention allow fuel savings in all the operating phases of a vehicle engine, preferentially a motor vehicle engine, and more particularly when starting.
• the lubricant compositions according to the invention have good storage stability as well as a viscosity that varies very little or not at all.
• the lubricant composition essentially consists of:
• the invention also relates to an engine oil comprising a lubricant composition as defined above.
• the invention also relates to the use of a lubricant composition as defined above for the lubrication of mechanical parts, in particular in transmissions and/or vehicle engines, preferentially motor vehicle engines.
• the invention also relates to the use of a lubricant composition as defined above for reducing friction between two steel surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the invention also relates to the use of an abovementioned lubricant composition for reducing friction between a steel surface and a carbon-covered surface, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the invention also relates to the use of a lubricant composition as defined above for reducing friction between two carbon-covered surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the invention also relates to the use of a lubricant composition as defined above for reducing the fuel consumption of vehicles, preferentially of motor vehicles.
• the invention also relates to a process for the lubrication of mechanical parts, in particular in transmissions and/or vehicle engines, preferentially motor vehicle engines, comprising at least one step of bringing at least one part into contact with a lubricant composition as defined above.
• the invention also relates to a process for reducing friction between two steel surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine, comprising at least one step of bringing at least one of the steel surfaces into contact with a lubricant composition as defined above.
• the invention also relates to a process for reducing friction between a steel surface and a carbon-covered surface, in particular in a vehicle engine, preferentially a motor vehicle engine, comprising at least one step of bringing at least one of the surfaces into contact with a lubricant composition as defined above.
• the invention also relates to a process for reducing friction between two carbon-covered surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine, comprising at least one step of bringing at least one of the carbon-covered surfaces into contact with a lubricant composition as defined above.
• the invention also relates to a process for reducing the fuel consumption of a vehicle, preferentially of a motor vehicle, comprising at least one step of bringing a mechanical part of the vehicle engine into contact with a lubricant composition as defined above.
• the invention also relates to the use of a fatty triamine in a lubricant composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between two steel surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the invention also relates to the use of a fatty triamine in a lubricant composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between a steel surface and a carbon-covered surface, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the invention also relates to the use of a fatty triamine in a lubricant composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between two carbon-covered surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the invention also relates to the use of a fatty triamine in a lubricant composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing the fuel consumption of a vehicle, preferentially of a motor vehicle.
• the invention also relates to a composition of the additives concentrate type comprising:
• the lubricant composition according to the invention comprises at least one organomolybdenum compound.
• organomolybdenum compound according to the invention is meant any oil-soluble organomolybdenum compound.
• the organomolybdenum compound can be selected from the organic molybdenum complexes such as the molybdenum carboxylates, esters, amides, which can be obtained by reaction of molybdenum oxide or of ammonium molybdates with fats, glycerides, fatty acids or fatty acid derivatives (esters, amines, amides etc.).
• the organomolybdenum compound is selected from the molybdenum complexes that are free of sulphur and of phosphorus, with amide-type ligands, mainly prepared by the reaction of a source of molybdenum, which can be for example trimolybdenum oxide, and an amine derivative, and fatty acids comprising for example from 4 to 28 carbon atoms, preferentially from 8 to 18 carbon atoms, such as for example the fatty acids contained in animal or vegetable oils.
• a source of molybdenum which can be for example trimolybdenum oxide, and an amine derivative
• fatty acids comprising for example from 4 to 28 carbon atoms, preferentially from 8 to 18 carbon atoms, such as for example the fatty acids contained in animal or vegetable oils.
• the synthesis of such compounds is for example described in the patents U.S. Pat. No. 4,889,647, EP 0546357, U.S. Pat. No. 5,412,130, EP 1770153
• the organomolybdenum compound is selected from the organic molybdenum complexes obtained by the reaction:
• the organic molybdenum complex can comprise from 2 to 8.5% by weight of molybdenum with respect to the weight of the complex.
• the organic molybdenum complex is constituted by at least one of the compounds of formula (I) or (II), alone or in a mixture:
• R 2 represents a linear or branched, saturated or unsaturated alkyl group, comprising from 3 to 30 carbon atoms, preferentially from 3 to 20 carbon atoms, advantageously from 7 to 17 carbon atoms.
• the organic molybdenum complex is prepared by the reaction:
• the organic molybdenum complex is constituted by at least one compound of formula (I-a) or (II-a), alone or in a mixture:
• R 1 represents a linear or branched, saturated or unsaturated alkyl group, comprising from 3 to 30 carbon atoms, preferentially from 3 to 20 carbon atoms, advantageously from 7 to 17 carbon atoms,
• R 1 represents a linear or branched, saturated or unsaturated alkyl group, comprising from 3 to 30 carbon atoms, preferentially from 3 to 20 carbon atoms, advantageously from 7 to 17 carbon atoms.
• the organomolybdenum compound can be selected from the molybdenum dithiophosphates or molybdenum dithiocarbamates. In a preferred embodiment of the invention, the organomolybdenum compound is selected from the molybdenum dithiocarbamates.
• the molybdenum dithiocarbamate compounds are complexes formed by a metal core linked to one or more ligands, the ligand being a dithiocarbamate group of alkyls. These compounds are well known to a person skilled in the art.
• the Mo-DTC compound can comprise from 1 to 40%, preferably from 2 to 30%, more preferentially from 3 to 28%, advantageously from 4 to 15% by mass of molybdenum, with respect to the total mass of Mo-DTC compound.
• the Mo-DTC compound can comprise from 1 to 40%, preferably from 2 to 30%, more preferentially from 3 to 28%, advantageously from 4 to 15% by mass of sulphur, with respect to the total mass of Mo-DTC compound.
• the Mo-DTC compound can be selected from those the core of which has two molybdenum atoms (also called dimeric Mo-DTC) and those the core of which present three molybdenum atoms (also called trimeric Mo-DTC).
• the trimeric Mo-DTC compounds correspond to the formula Mo3SkLn in which:
• the compounds and their preparation processes as described in the documents WO 98/26030 and U.S. Pat. No. 2003/022954 may be mentioned.
• the Mo-DTC compound is a dimeric Mo-DTC compound.
• dimeric Mo-DTC compounds the compounds and their preparation processes as described in the documents EP 0757093, EP 0719851, EP 0743354 or EP 1013749 may be mentioned.
• the dimeric Mo-DTC compounds correspond generally to the compounds of formula (III):
• alkyl group within the meaning of the invention, is meant a linear or branched, saturated or unsaturated hydrocarbon-containing group, comprising from 1 to 24 carbon atoms.
• the alkyl group is selected from the group formed by methyl, ethyl, propyl, isopropyl, n-butyl, iso-butyl, tert-butyl, n-pentyl, iso-pentyl, neopentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, isotridecyl, tetradecyl, hexadecyl, stearyl, icosyl, docosyl , tetracosyl, triacontyl, 2-ethylhexyl, 2-butyloctyl, 2-butyldecyl, 2-
• alkenyl group within the meaning of the present invention, is meant a linear or branched hydrocarbon-containing group comprising at least one double bond and comprising from 2 to 24 carbon atoms.
• the alkenyl group can be selected from vinyl, allyl, propenyl, butenyl, isobutenyl, pentenyl, isopentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tetradecenyl and oleic.
• aryl group within the meaning of the present invention, is meant a polycyclic aromatic hydrocarbon or an aromatic group, substituted or not substituted with an alkyl group.
• the aryl group can comprise from 6 to 24 carbon atoms.
• the aryl group can be selected from the group formed by phenyl, toluyl, xylyl, cumenyl, mesityl, benzyl, phenethyl, styryl, cinnamyl, benzhydryl, trityl, ethylphenyl, propylphenyl, butylphenyl, pentylphenyl, hexylphenyl, heptylphenyl, octylphenyl, nonylphenyl, decylphenyl, undecylphenyl, dodecylphenyl, phenylphenyl, benzylphenyl, phenyl-styrene
• the cycloalkyl groups and the cycloalkenyl groups can be selected, non-limitatively, from the group constituted by cyclopentyl, cyclohexyl, cycloheptyl, methylcyclopentyl, methylcyclohexyl, methylcycloheptyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, methylcyclopentenyl, methylcyclohexenyl.
• the cycloalkyl groups and the cycloalkenyl groups can comprise from 3 to 24 carbon atoms.
• R 3 , R 4 , R 5 and R 6 represent independently an alkyl group comprising from 4 to 18 carbon atoms or an alkenyl group comprising from 2 to 24 carbon atoms.
• X 3 , X 4 , X 5 and X 6 can be identical and can represent a sulphur atom.
• X 3 , X 4 , X 5 and X 6 can be identical and can be an oxygen atom.
• X 3 and X 4 can represent a sulphur atom and X 5 and X 6 can represent an oxygen atom.
• X 3 and X 4 can represent an oxygen atom and X 5 and X 6 can represent a sulphur atom.
• the ratio of the number of sulphur atoms to the number of oxygen atoms (S/O) of the Mo-DTC compound can vary from (1/3) to (3/1).
• the Mo-DTC compound of formula (A) can be selected from a symmetrical Mo-DTC compound, an asymmetrical Mo-DTC compound and a combination thereof.
• symmetrical Mo-DTC compound according to the invention is meant an Mo-DTC compound of formula (III) in which the R 3 , R 4 , R 5 and R 6 groups are identical.
• asymmetrical Mo-DTC compound is meant an Mo-DTC compound of formula (III) in which the R 3 and R 4 groups are identical, the R 5 and R 6 groups are identical and the R 3 and R 4 groups are different from the R 5 and R 6 groups.
• the Mo-DTC compound is a mixture of at least one symmetrical Mo-DTC compound and at least one asymmetrical Mo-DTC compound.
• R 3 and R 4 represent an alkyl group comprising from 5 to 15 carbon atoms and R 5 and R 6 , which are identical and different from R 3 and R 4 , represent an alkyl group comprising from 5 to 15 carbon atoms.
• R 3 and R 4 represent an alkyl group comprising from 6 to 10 carbon atoms and R 5 and R 6 represent an alkyl group comprising from 10 to 15 carbon atoms.
• R 3 and R 4 which are identical, represent an alkyl group comprising from 10 to 15 carbon atoms and R 5 and R 6 represent an alkyl group comprising from 6 to 10 carbon atoms.
• R 3 , R 4 , R 5 and R 6 represent an alkyl group comprising from 5 to 15 carbon atoms, preferably from 8 to 13 carbon atoms.
• the Mo-DTC compound is selected from the compounds of formula (Ill) in which:
• the Mo-DTC compound is selected from the compounds of formula (III-a)
• the Mo-DTC compound is a mixture of:
• the products Molyvan L, Molyvan 807 or Molyvan 822 marketed by R.T. Vanderbilt Company or the products Sakura-lube 200, Sakura-lube 165, Sakura-lube 525 or Sakura-lube 600 marketed by Adeka may be mentioned.
• the content by weight of organomolybdenum compound ranges from 0.05 to 3%, preferably from 0.1 to 2%, advantageously from 0.1 to 1% with respect to the total weight of the lubricant composition.
• the lubricant composition according to the invention comprises at least one compound comprising a dithiophosphate group.
• the compound comprising a dithiophosphate group is called “dithiophosphate” in the remainder of the present description.
• the dithiophosphate can be selected from the ammonium dithiophosphates, the amine dithiophosphates, the ester dithiophosphates and the metal dithiophosphates, alone or in a mixture.
• the dithiophosphate is selected from the ammonium dithiophosphates of formula (IV):
• R 7 and R 8 represent independently of one another an optionally substituted hydrocarbon-containing group, comprising from 1 to 30 carbon atoms.
• R 7 and R 8 represent independently of one another an optionally substituted hydrocarbon-containing group, comprising from 2 to 24 carbon atoms, more preferentially from 3 to 18 carbon atoms, advantageously from 5 to 12 carbon atoms.
• R 7 and R 8 represent independently of one another an unsubstituted hydrocarbon-containing group, said hydrocarbon-containing group being able to be an alkyl, alkenyl, alkynyl, phenyl or benzyl group.
• R 7 and R 8 represent independently of one another a linear or branched hydrocarbon-containing alkyl group, more preferentially a linear hydrocarbon-containing alkyl group.
• R 7 and R 8 represent independently of one another a hydrocarbon-containing group optionally substituted with at least one oxygen, nitrogen, sulphur and/or phosphorus atom, preferably with at least one oxygen atom.
• the dithiophosphate is selected from the amine dithiophosphates of general formula (V):
• R 9 and R 10 represent independently of one another a hydrocarbon-containing group, optionally substituted, comprising from 2 to 24 carbon atoms, more preferentially from 3 to 18 carbon atoms, advantageously from 5 to 12 carbon atoms.
• R 9 and R 10 represent independently of one another an unsubstituted hydrocarbon-containing group, said hydrocarbon-containing group being able to be an alkyl, alkenyl, alkynyl, phenyl or benzyl group.
• R 9 and R 10 represent independently of one another a linear or branched hydrocarbon-containing alkyl group, more preferentially a linear hydrocarbon-containing alkyl group.
• R 9 and R 10 represent independently of one another a hydrocarbon-containing group optionally substituted with at least one oxygen, nitrogen, sulphur and/or phosphorus atom, preferably with at least one oxygen atom.
• R 11 , R 12 and R 13 represent independently of one another a hydrocarbon-containing group comprising from 2 to 24 carbon atoms, more preferentially from 3 to 18 carbon atoms, advantageously from 5 to 12 carbon atoms.
• the dithiophosphate is selected from the ester dithiophosphates of general formula (VI):
• R 14 and R 15 represent independently of one another an optionally substituted hydrocarbon-containing group, comprising from 2 to 24 carbon atoms, more preferentially from 3 to 18 carbon atoms, advantageously from 5 to 12 carbon atoms.
• R 14 and R 15 represent independently of one another an unsubstituted hydrocarbon-containing group, said hydrocarbon-containing group being able to be an alkyl, alkenyl, alkynyl, phenyl or benzyl group.
• R 14 and R 15 represent independently of one another a linear or branched hydrocarbon-containing alkyl group, more preferentially a linear hydrocarbon-containing alkyl group.
• R 14 and R 15 represent independently of one another a hydrocarbon-containing group optionally substituted with at least one oxygen, nitrogen, sulphur and/or phosphorus atom, preferably with at least one oxygen atom.
• R 14 and R 15 represent independently of one another, a hydrocarbon-containing group comprising from 2 to 6 carbon atoms.
• R 16 and R 17 represent independently of one another a hydrocarbon-containing group comprising from 2 to 6 carbon atoms.
• the dithiophosphate is selected from the metal dithiophosphates of general formula (VII):
• the metal is selected from the group constituted by zinc, aluminium, copper, iron, mercury, silver, cadmium, tin, lead, antimony, bismuth, thallium, chromium, molybdenum, cobalt, nickel, tungsten, sodium, calcium, magnesium, manganese and arsenic.
• the preferred metals are zinc, molybdenum, antimony, preferably zinc and molybdenum.*
• the metal is zinc. Mixtures of metals can be used.
• the metal dithiophosphates are neutral as exemplified in formula (VII) or basic when a stoichiometric excess of metal is present.
• R 18 and R 19 represent independently of one another an optionally substituted hydrocarbon-containing group, comprising from 2 to 24 carbon atoms, more preferentially from 3 to 18 carbon atoms, advantageously from 5 to 12 carbon atoms.
• R 18 and R 19 represent independently of one another an unsubstituted hydrocarbon-containing group, said hydrocarbon-containing group being able to be an alkyl, alkenyl, alkynyl, phenyl or benzyl group.
• R 18 and R 19 represent independently of one another a linear or branched hydrocarbon-containing alkyl group, more preferentially a linear hydrocarbon-containing alkyl group.
• R 18 and R 19 represent independently of one another a hydrocarbon-containing group optionally substituted with at least one oxygen, nitrogen, sulphur and/or phosphorus atom, preferably with at least one oxygen atom.
• the dithiophosphate according to the invention is a zinc dithiophosphate of formula (VII-a) or formula (VII-b):
• the content by weight of dithiophosphate ranges from 0.1 to 5%, preferably from 0.1 to 3%, advantageously from 0.5 to 2% with respect to the total weight of the lubricant composition.
• the lubricant composition according to the invention comprises at least one fatty triamine.
• the fatty triamines are mainly obtained from carboxylic acids.
• the starting fatty acids for obtaining fatty triamines according to the invention can be selected from myristic, pentadecylic, palmitic, margaric, stearic, nonadecylic, arachidic, heneicosanoic, behenic, tricosanoic, lignoceric, pentacosanoic, cerotic, heptacosanoic, montanic, nonacosanoic, melissic, hentriacontanoic, laceroic acids or unsaturated fatty acids such as palmitoleic, oleic, erucic, nervonic, linoleic, a-linolenic, gamma-linolenic, di-homo-gamma-linolenic, arachid
• the preferred fatty acids can originate from the hydrolysis of the triglycerides present in vegetable or animal oils such as coconut, palm, olive, groundnut, rapeseed, sunflower, soya, cotton, linseed oil, beef tallow, etc.
• the natural oils may have been genetically modified so as to enrich their content of certain fatty acids.
• rapeseed oil or oleic sunflower oil may be mentioned.
• the fatty triamines can be obtained from natural vegetable or animal resources.
• the fatty triamine is selected from the compounds of formula (VIII):
• R 20 represents a linear or branched, saturated or unsaturated alkyl group, comprising at least 10 carbon atoms, preferentially from 10 to 22 carbon atoms, more preferentially from 14 to 22 carbon atoms, advantageously from 16 to 20 carbon atoms.
• the fatty triamine is selected from the compounds of formula (IX):
• R 21 represents a linear or branched, saturated or unsaturated alkyl group, comprising at least 10 carbon atoms, preferentially from 10 to 22 carbon atoms, more preferentially from 14 to 22 carbon atoms, advantageously from 16 to 20 carbon atoms.
• the content by weight of fatty triamine ranges from 0.1 to 5%, preferably from 0.1 to 3%, advantageously from 0.5 to 2% with respect to the total weight of the composition.
• the lubricant composition comprises a mass ratio (organomolybdenum compound/fatty triamine) ranging from 1/10 to 1, preferably from 1/5 to 4/5.
• the lubricant composition comprises a mass ratio (organomolybdenum compound/compound comprising a dithiophosphate group/fatty triamine) ranging from 1/10/10 to 1/1/1, preferably ranging from 1/5/5 to 4/5/5.
• the lubricant compositions according to the invention can contain any type of lubricant base oil, mineral, synthetic or natural, animal or vegetable, suitable for their use.
• the base oil or oils used in the lubricant compositions according to the present invention can be oils of mineral or synthetic origin of groups I to V according to the classes defined in the API classification (or their equivalents according to the ATIEL classification) as summarized below, alone or in mixture.
• the mineral base oils according to the invention include all types of bases obtained by atmospheric and vacuum distillation of crude oil, followed by refining operations such as solvent extraction, deasphalting, solvent dewaxing, hydrotreatment, hydrocracking and hydroisomerization, hydrofinishing.
• the base oils of the compositions according to the present invention can also be synthetic oils, such as certain esters of carboxylic acids and of alcohols, or polyalphaolefins.
• the polyalphaolephins used as base oils are for example obtained from monomers having from 4 to 32 carbon atoms (for example octene, decene), and a viscosity at 100° C. comprised between 1.5 and 15 cSt (measured according to the standard ASTM D 445). Their average molecular weight is typically comprised between 250 and 3000 according to the standard ASTM D5296. Mixtures of synthetic and mineral oils can also be used.
• the lubricant bases represent at least 50% by mass, with respect to the total mass of the lubricant composition, preferentially at least 60%, or also at least 70%. Typically, they represent between 75 and 99.9% by mass, with respect to the total mass of the lubricant compositions according to the invention.
• the lubricant compositions comprise mineral bases of group I and/or III, or synthetic bases of group IV according to the API classification.
• the lubricant compositions have a kinematic viscosity at 100° C. measured according to the standard ASTM D445 ranging from 4 to 25 cSt, preferably from 5 to 22 cSt, advantageously from 5 to 13 cSt.
• the lubricant compositions have a viscosity index (VI) greater than or equal to 140, preferentially greater than or equal to 150, measured according to the standard ASTM 2270.
• the lubricant compositions according to the invention can also additionally contain at least one additive selected from the detergents, anti-wear additives different from a dithiophosphate, extreme pressure additives, dispersants, pour-point improvers, anti-foaming agents, thickeners and mixtures thereof.
• the lubricant composition can additionally comprise at least one antioxidant additive.
• the antioxidant additives slow down the degradation of the lubricant compositions in service, in particular of the engine oils in service, degradation which can in particular result in the formation of deposits, the presence of sludges, or an increase in the viscosity of the lubricant composition, in particular of the engine oil.
• the antioxidant additives act in particular as radical inhibitors or hydroperoxide destroyers.
• antioxidants commonly used, antioxidants of the phenolic or amine type, or phosphorus- and sulphur-containing antioxidants may be mentioned. Some of these antioxidants, for example the phosphorus- and sulphur-containing antioxidants, may generate ashes.
• the phenolic antioxidants may be ash-free, or be in the form of neutral or basic metal salts.
• the antioxidant agents can be in particular selected from the sterically hindered phenols, the esters of sterically hindered phenols and the sterically hindered phenols comprising a thioether bridge, the diphenylamines, the diphenylamines substituted with at least one C1-C12 alkyl group, the N,N′ dialkyl aryl diamines and combinations thereof.
• sterically hindered phenol is meant within the meaning of the present invention a compound comprising a phenol group in which at least one vicinal carbon of the carbon bearing the alcohol function is substituted with at least one C1-C10 alkyl group, preferably a C1-C6 alkyl group, preferably a C4 alkyl group, preferably with the tert-butyl group.
• the amine compounds are another class of antioxidants which can be used, optionally in combination with the phenolic antioxidants.
• Typical examples are the aromatic amines of formula R 22 R 23 R 24 N, in which R 22 represents an aliphatic group or an optionally substituted aromatic group, R 23 represents an optionally substituted aromatic group, R 24 represents a hydrogen atom, an alkyl group, an aryl group or a group of formula R 25 S(O) z R 26 , where R 25 represents an alkylene group or an alkenylene group, R2 6 represents an alkyl group, an alkenyl group or an aryl group and z represents an integer equal to 0, 1 or 2.
• Sulphurized alkyl phenols or their alkali or alkaline-earth metal salts can also be used as antioxidants.
• Another class of antioxidants is that of the copper compounds, for example the copper thio-or dithiophosphates, salts of copper and of carboxylic acids, dithiocarbamates, sulphonates, phenates, copper acetylacetonates. Copper I and II salts of succinic acid or anhydride can also be used.
• the lubricant composition according to the invention can contain any type of antioxidant additives known to a person skilled in the art.
• the ash-free antioxidants are used.
• the lubricant composition according to the invention can comprise from 0.5 to 2% of at least one antioxidant additive by weight with respect to the total mass of the lubricant composition.
• the lubricant composition according to the invention can also comprise a detergent additive.
• the detergent additives reduce in particular the formation of deposits on the surface of the metal parts by dissolving the by-products of oxidation and combustion.
• the detergents that can be used in the lubricant composition according to the invention are well known to a person skilled in the art.
• the detergents commonly used in the formulation of lubricant compositions can be anionic compounds comprising a lipophilic long hydrocarbon-containing chain and a hydrophilic head.
• the associated cation is typically a metal cation of an alkali or alkaline-earth metal.
• the detergents are preferentially selected from the alkali or alkaline-earth metal salts of carboxylic acids, sulphonates, salicylates, naphthenates, as well as the salts of phenates.
• the alkali or alkaline-earth metals are preferentially calcium, magnesium, sodium or barium.
• These metal salts can contain the metal in an approximately stoichiometric quantity or in excess (in a quantity greater than the stoichiometric quantity). In the latter case, these detergents are referred to as overbased detergents.
• the excess metal providing the detergent with its overbased character is present in the form of metal salts which are insoluble in oil, for example carbonate, hydroxide, oxalate, acetate, glutamate, preferentially carbonate.
• the lubricant composition according to the invention can comprise from 2 to 4% by weight of detergent, with respect to the total mass of the lubricant composition.
• the lubricant composition according to the invention can also comprise at least one pour point depressant additive.
• the pour point depressant additives in particular improve the low-temperature behaviour of the lubricant compositions, by slowing down the formation of paraffin crystals.
• the alkyl polymethacrylates, polyacrylates, polyarylamides, polyalkylphenols, polyalkylnaphthalenes, alkylated polystyrenes may be mentioned.
• the lubricant composition according to the invention can also comprise at least one dispersant.
• the dispersants can be selected from the groups formed by the Mannich base or bases.
• the lubricant composition according to the invention can comprise from 0.2 to 10% by mass of dispersants with respect to the total mass of the lubricant composition.
• the lubricant composition can also comprise at least one polymer improving the viscosity index.
• polymers the polymer esters, the ethylene and propylene copolymers, the homopolymers or copolymers of styrene, butadiene or isoprene, hydrogenated or not, and the polymethacrylates (PMA) may be mentioned.
• the lubricant composition according to the invention can comprise from 1 to 15% by mass of polymers improving the viscosity index, with respect to the total mass of the lubricant composition.
• the lubricant composition comprises:
• the lubricant composition comprises:
• the lubricant composition essentially consists of:
• the lubricant composition essentially consists of:
• the lubricant composition is not an emulsion. In another embodiment of the invention, the lubricant composition is anhydrous.
• An object of the invention is also an engine oil comprising a lubricant composition according to the invention. All of the characteristics and preferences presented for the lubricant composition also apply to the engine oil according to the invention.
• the engine oil can be of grades 0W-20 and 5W-30 according to the SAE J300 classification, characterized by a kinematic viscosity at 100° C. (KV100) ranging from 5.6 to 12.5 cSt measured according to the international standard ASTM D445.
• the engine oil can be characterized by a viscosity index, calculated according to the international standard ASTM D2230, greater than or equal to 130, preferably greater than or equal to 150.
• base oils having a sulphur content less than 0.3% for example mineral oils of group III, and synthetic bases free of sulphur, preferentially of group IV, or mixtures thereof may advantageously be used.
• An object of the invention is also the use of a lubricant composition as defined above for the lubrication of mechanical parts, in particular in transmissions and/or vehicle engines, preferentially motor vehicle engines.
• An object of the invention is also the use of a lubricant composition as defined above for reducing friction between two steel surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• An object of the invention is also the use of an abovementioned lubricant composition for reducing friction between a steel surface and a carbon-covered surface, in particular in a vehicle engine, preferentially a motor vehicle engine.
• An object of the invention is also the use of a lubricant composition as defined above for reducing friction between two carbon-covered surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• carbon coating is meant any coating comprising carbon.
• These carbon coatings can be selected from diamond coatings, and more particularly nanodiamond coatings.
• Such coatings can in particular be presented in the form of at least one nanocrystalline diamond layer, having a purity ranging from 70 to 99%.
• the carbon coatings are selected from nanodiamond coatings in the form of at least one nanocrystalline diamond layer having a purity ranging from 70 to 99%, preferentially ranging from 70 to 97%, advantageously of 75% and a thickness ranging from 0.1 to 3 ⁇ , preferentially ranging from 0.5 to 2 ⁇ , advantageously of 1.5 ⁇ .
• These carbon coatings can also be selected from DLC (Diamond Like Carbon) type coatings. Any type of DLC coating can be used as carbon coating according to the invention.
• the DLCs group together a set of families of amorphous materials essentially containing carbon.
• the hydrogenated DLCs in particular the hydrogenated DLCs known as a-C:H and the non-hydrogenated DLCs, in particular the non-hydrogenated DLCs known as a-C or the non-hydrogenated DLCs known as to-C.
• the DLCs have properties which vary as a function of their sp3 hybrid carbon content and their hydrogen content. Certain variants of DLC can be doped with metal elements, such as iron, chromium or tungsten.
• the DLC coatings are generally less mechanically and thermally resistant as these are amorphous materials. However, they are generally less rough and above all can be applied to the majority of substrates at a low temperature.
• the DLCs are selected from the hydrogenated DLCs, in particular the hydrogenated DLCs known as a-C:H.
• the DLCs are selected from the hydrogenated DLCs, in particular the hydrogenated DLCs known as a-C:H containing from 10 to 40% of hydrogen.
• the above use also makes it possible to not worsen, or even to reduce the wear between two steel surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the above use also makes it possible to not worsen, or even to reduce the wear between a steel surface and a carbon-covered surface, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the above use also makes it possible to not worsen, or even to reduce the wear between two carbon-covered surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the invention also relates to the use of a lubricant composition as defined above for reducing the fuel consumption of vehicles, preferentially of motor vehicles. All of the characteristics and preferences presented for the lubricant composition also apply to the above uses.
• the invention also relates to a process for the lubrication of mechanical parts, in particular in transmissions and/or vehicle engines, preferentially motor vehicle engines, comprising at least one step of bringing at least one part into contact with a lubricant composition as defined above.
• An object of the invention is also a process for reducing friction between two steel surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine, comprising at least one step of bringing at least one of the steel surfaces into contact with a lubricant composition as defined above.
• An object of the invention is also a process for reducing friction between a steel surface and a carbon-covered surface, in particular in a vehicle engine, preferentially a motor vehicle engine, comprising at least one step of bringing at least one of the surfaces into contact with a lubricant composition as defined above.
• An object of the invention is also a process for reducing friction between two carbon-covered surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine, comprising at least one step of bringing at least one of the carbon-covered surfaces into contact with a lubricant composition as defined above.
• the above process also makes it possible to not worsen, or even to reduce the wear between two steel surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the above process also makes it possible to not worsen, or even to reduce the wear between a steel surface and a carbon-covered surface, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the above process also makes it possible to not worsen, or even to reduce the wear between two carbon-covered surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• An object of the invention is also a process for reducing the fuel consumption of a vehicle, preferentially of a motor vehicle, comprising at least one step of bringing a mechanical part of the vehicle engine into contact with a lubricant composition as defined above. All of the characteristics and preferences presented for the lubricant composition also apply to the above processes.
• the vehicles can comprise a two or four stroke internal combustion engine.
• the engines can be gasoline engines or diesel engines intended to be supplied with standard gasoline or diesel.
• standard gasoline or by “standard diesel”, is meant within the meaning of the present invention, engines which are supplied with a fuel obtained after refining of an oil of mineral origin (such as petroleum for example).
• the engines can also be gasoline engines or diesel engines modified to be supplied with a fuel based on oils originating from renewable materials such as fuels based on alcohol or biodiesel fuel.
• the vehicles can be light vehicles such as cars and motorcycles.
• the vehicles can also be heavy goods vehicles, public works vehicles and ships.
• An object of the invention is also the use of a fatty triamine in a lubricant composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between two steel surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• An object of the invention is also the use of a fatty triamine in a lubricant composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between a steel surface and a carbon-covered surface, in particular in a vehicle engine, preferentially a motor vehicle engine.
• An object of the invention is also the use of a fatty triamine in a lubricant composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing friction between two carbon-covered surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the above use also makes it possible to not worsen, or even to reduce the wear between two steel surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the above use also makes it possible to not worsen, or even to reduce the wear between a steel surface and a carbon-covered surface, in particular in a vehicle engine, preferentially a motor vehicle engine.
• the above use also makes it possible to not worsen, or even to reduce the wear between two carbon-covered surfaces, in particular in a vehicle engine, preferentially a motor vehicle engine.
• An object of the invention is also the use of a fatty triamine in a lubricant composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate group for reducing the fuel consumption of a vehicle, preferentially of a motor vehicle. All of the characteristics and preferences presented for the base oil, the fatty triamine, the organomolybdenum compound and the compound comprising a dithiophosphate group also apply to the above uses.
• the invention also relates to a composition of the additives concentrate type comprising:
• the composition of the additives concentrate type also comprises at least one additional additive.
• the additional additive can be selected from the abovementioned additives.
• at least one base oil can be added to the composition of the additives concentrate type according to the invention, in order to obtain a lubricant composition according to the invention.
• Lubricant compositions No. 1 to No. 6 are prepared from the following compounds:
• Test 1 Assessment of the Friction Properties of Lubricant Compositions on a Steel/Steel Ccontact
• the friction properties of lubricant compositions No. 1, No. 2 and No. 4 on steel/steel contacts are assessed by measurement of the coefficient of friction.
• the coefficient of friction is assessed using a ball-on-flat linear tribometer under the following conditions:
• lubricant composition according to the invention No. 4 has improved friction properties for steel/steel contacts, relative to a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to the invention but comprising no fatty triamine according to the invention (composition No. 2).
• composition No. 2 a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to the invention but comprising no fatty triamine according to the invention
• Test 2 Assessment of the Friction Properties of Lubricant Compositions on a DLC/Steel Contact
• the friction properties of lubricant compositions No. 1, No. 2, No. 4 and No. 6 on the DLC/steel contacts are assessed by measurement of the coefficient of friction.
• the coefficient of friction is assessed using a DLC ball/steel flat linear tribometer under the following conditions:
• lubricant composition according to the invention No. 4 has improved friction properties on DLC/steel contacts, in comparison with a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to the invention but comprising no fatty triamine according to the invention (composition No. 2), as well as in comparison with a lubricant composition comprising a fatty triamine according to the invention but comprising no organomolybdenum compound according to the invention and no compound comprising a dithiophosphate group according to the invention (composition No. 6). It is of interest to note that the coefficient of frictions of lubricant compositions No. 2 and No.
• Test 3 Assessment of the Friction Properties of Lubricant Compositions on a DLC/Steel Contact
• the friction properties of lubricant compositions No. 1, No. 2 and No. 4 on DLC/steel contacts are assessed by measurement of the coefficient of friction.
• the coefficient of friction is assessed using a DLC ball/steel flat HFFR tribometer under the following conditions:
• Test 4 Assessment of the Friction Properties of Lubricant Compositions on a DLC/Steel Contact
• the friction properties of lubricant compositions No. 1, No. 3 and No. 5 on the DLC/steel contacts are assessed by measurement of the coefficient of friction.
• the coefficient of friction is assessed according to the method described in test 3. A difference of at least 0.01 between two coefficient of friction values is considered as significant for showing the influence on said coefficient of friction.
• Table VI shows the coefficient of friction of lubricant compositions No. 1, No. 3 and No. 5.
• Lubricant compositions No. 7 to No. 10 are prepared from the following compounds:
• Test 5 Assessment of the Friction Properties of Lubricant Compositions on a Steel/Steel Contact
• the friction properties of lubricant compositions No. 7, No. 8, No. 9 and No. 10 on steel/steel contacts are assessed by measurement of the coefficient of friction.
• the coefficient of friction is assessed according to the method described in test 1. A difference of at least 0.01 between two coefficient of friction values is considered as significant for showing the influence on said coefficient of friction.
• Table VIII shows the coefficient of friction of lubricant compositions No. 7, No. 8, No. 9 and No. 10.
• lubricant composition according to the invention No. 9 has improved friction properties on steel/steel contacts, in comparison with a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to the invention but comprising no fatty triamine according to the invention (composition No. 8), as well as in comparison with a lubricant composition comprising a fatty triamine according to the invention but comprising no organomolybdenum compound according to the invention and no compound comprising a dithiophosphate group according to the invention (composition No. 10). It is of interest to note that the coefficients of friction of lubricant compositions No. 8 and No.
• Test 6 Assessment of the Friction Properties of Lubricant Compositions on a Steel/Diamond Contact
• the friction properties of lubricant compositions No. 7, No. 8 and No. 9 on steel/diamond contacts are assessed by measurement of the coefficient of friction.
• the coefficient of friction is assessed using a nanodiamond ball/steel flat linear tribometer under the following conditions:
• the lubricant composition according to the invention No. 9 has improved friction properties for steel/diamond contacts, relative to a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to the invention but comprising no fatty triamine according to the invention (composition No. 8).
• composition No. 8 a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to the invention but comprising no fatty triamine according to the invention
• Test 7 Assessment of the Friction Properties of Lubricant Compositions on a DLC/Steel Contact
• the friction properties of lubricant compositions No. 7, No. 8 and No. 9 on DLC/steel contacts are assessed by measurement of the coefficient of friction.
• the coefficient of friction is assessed according to the method described in test 2. A difference of at least 0.01 between two coefficient of friction values is considered as significant for showing the influence on said coefficient of friction.
• Table X shows the coefficient of friction of lubricant compositions No. 7, No. 8 and No. 9.
• composition No. 9 has improved friction properties for DLC/steel contacts, relative to a lubricant composition comprising an organomolybdenum compound according to the invention and a compound comprising a dithiophosphate group according to the invention but comprising no fatty triamine according to the invention (composition No. 8).

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