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WO2018210829A1 - Use of lubricating compositions to improve the performance of a 4-stroke vehicle engine - Google Patents

Use of lubricating compositions to improve the performance of a 4-stroke vehicle engine Download PDF

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Publication number
WO2018210829A1
WO2018210829A1 PCT/EP2018/062553 EP2018062553W WO2018210829A1 WO 2018210829 A1 WO2018210829 A1 WO 2018210829A1 EP 2018062553 W EP2018062553 W EP 2018062553W WO 2018210829 A1 WO2018210829 A1 WO 2018210829A1
Authority
WO
WIPO (PCT)
Prior art keywords
engine
composition
lubricating
additives
alcohol
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2018/062553
Other languages
French (fr)
Other versions
WO2018210829A8 (en
Inventor
Nicolas CHAMPAGNE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TotalEnergies Marketing Services SA
Original Assignee
Total Marketing Services SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Total Marketing Services SA filed Critical Total Marketing Services SA
Priority to CN201880031401.XA priority Critical patent/CN110621765A/en
Priority to US16/612,201 priority patent/US20200299603A1/en
Priority to KR1020197033169A priority patent/KR20190142771A/en
Priority to EP18726101.1A priority patent/EP3625315A1/en
Publication of WO2018210829A1 publication Critical patent/WO2018210829A1/en
Anticipated expiration legal-status Critical
Publication of WO2018210829A8 publication Critical patent/WO2018210829A8/en
Ceased legal-status Critical Current

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    • 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
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/04—Hydroxy compounds
    • C10M129/06—Hydroxy compounds having hydroxy 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
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/04—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/021—Hydroxy compounds having hydroxy 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
    • 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
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl 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
    • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
    • C10M2215/28—Amides; Imides
    • 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
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/046—Overbased sulfonic acid 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
    • 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
    • C10M2227/06—Organic compounds derived from inorganic acids or metal salts
    • C10M2227/066—Organic compounds derived from inorganic acids or metal salts derived from Mo or W
    • 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
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/02—Unspecified siloxanes; Silicones
    • 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
    • C10N2010/04—Groups 2 or 12
    • 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
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/065—Saturated Compounds
    • 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
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/069—Linear chain compounds
    • 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
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/071—Branched chain compounds
    • 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
    • C10N2030/02—Pour-point; Viscosity index
    • 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
    • C10N2030/04—Detergent property or dispersant property
    • 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
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C10N2040/252—Diesel 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
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/25—Internal-combustion engines
    • C10N2040/255—Gasoline engines

Definitions

  • the invention relates to the use of a lubricant composition for improving the cleanliness of a 4-stroke vehicle engine. More particularly, the invention relates to the use of an alcohol in a lubricating composition to improve the cleanliness of a 4-stroke vehicle engine.
  • the conditions of use of gasoline engines and diesel engines include extremely short journeys as well as long journeys. In fact, 80% of the journeys of Western European cars are less than 12 kilometers while vehicles cover annual mileages of up to 300 000 km.
  • the emptying intervals are also very variable, from 5,000 km for some small diesel engines to up to 100,000 km on modern commercial diesel engines.
  • Lubricating compositions and especially lubricating compositions for motor vehicles must therefore have improved properties and performance.
  • lubricating compositions for improving the cleanliness of a 4-stroke vehicle engine. Improving the cleanliness of such an engine generally includes reducing the formation of deposits, including training high temperature deposits such as varnishes, lacquers or deposits of carbon or coke. Such deposits may be formed on the hot surfaces of the engine parts such as piston throat bottoms, turbos axes or air compressors. The substances present in the lubricating compositions can oxidize in contact with the hot surfaces of the engine and generate the formation of insoluble products forming deposits. These deposits can foul the engine and cause problems of wear, seizing, scrubbing segments and turbo rotation problems for example. Generally, detergent or dispersant type additives are used to improve the cleanliness of a 4-stroke vehicle engine.
  • An object of the present invention is therefore to provide compounds as well as a lubricating composition comprising these compounds which overcomes all or part of the aforementioned drawbacks.
  • Another object of the present invention is to provide a lubricant composition for improving the cleanliness of a 4-stroke vehicle engine and whose formulation is easy to implement.
  • Another object of the present invention is to provide a lubricant composition to improve the cleanliness of a 4-stroke vehicle engine and to reduce the content of detergent or dispersant additives.
  • Yet another object of the present invention is to provide a lubricant composition for improving the cleanliness of a 4-stroke vehicle engine while retaining good cold properties.
  • the invention thus relates to the use of an alcohol of formula (I)
  • R represents a saturated linear or branched alkyl group comprising from 10 to 36 carbon atoms, preferably from 12 to 36 carbon atoms, preferentially from 12 to 24 carbon atoms, even more preferably from 12 to 18 carbon atoms, carbon,
  • the improvement of the engine cleanliness according to the invention is considered as improving the engine cleanliness compared to what is obtained for a lubricating composition not comprising any alcohol according to the invention.
  • the Applicant has found that the presence of at least one alcohol of formula (I) in a lubricant composition makes it possible to improve the cleanliness of a 4-stroke vehicle engine.
  • the Applicant has also found that the presence of at least one alcohol of formula (I) also makes it possible to retain good cold properties of the lubricant.
  • the lubricant compositions according to the invention have good properties for improving the cleanliness once implemented in an engine, this making it possible to reduce the content of detergent additives in said lubricating compositions.
  • the alcohol is chosen from compounds of formula (I) in which R represents a saturated branched alkyl group comprising from 10 to 36 carbon atoms preferably from 12 to 36 carbon atoms, preferably from 12 to 24 carbon atoms, more preferably from 12 to 18 carbon atoms.
  • the inventors have shown that an alcohol having an alkyl chain comprising more than 36 carbon atoms was solid. Thus, during the cold start the composition is not sufficiently fluid and therefore does not play its role. Moreover, the inventors have shown that an alcohol having an alkyl chain comprising less than 10 carbon atoms was very volatile. Thus, during operation of the engine, hot, the alcohol is volatilized and can no longer play its role. The choice of alcohol is therefore essential in the context of the invention.
  • the alcohol of formula (I) is of formula (Ia)
  • R 1 and R 2 are linear or branched saturated alkyls chosen so that the compound of formula (la) comprises from 10 to 36 carbon atoms, preferably from 12 to 36 carbon atoms, preferably from 12 to 24 carbon atoms, more preferably 12 to 18 carbon atoms.
  • the alcohols according to the invention are marketed by Ecogreen Oleochemicals under the names Ecorol 12 / 98®, Ecorol 14 / 98® and Ecorol 16 / 98® or by the company Sasol under the name Isofol®.
  • the alcohols of formula (I) with branched R, or the alcohols of formula (Ia), which are branched alcohols are liquid at temperatures below 0 ° C. (low melting point), which allows optimized use of lubricating compositions in 4-stroke vehicle engines according to the invention.
  • the lubricant compositions comprising these alcohols have good cold properties.
  • the lubricating composition comprises from 0.1 to 10% by weight, preferably from 0.1 to 4% by weight, more preferably from 0.2 to 3% by weight, advantageously from 0.3 to 2.5% by weight. % by weight of alcohol relative to the total weight of the lubricant composition.
  • the present invention also relates to a lubricant composition for a 4-stroke vehicle engine, comprising:
  • the present application also relates to the use of the lubricant composition according to the invention for improving the cleanliness of a 4-stroke vehicle engine.
  • the invention also relates to a method for improving the cleanliness of a 4-stroke vehicle engine, said method comprising at least one step of bringing a mechanical part of the machine into contact with a lubricating composition as defined above. .
  • the percentages indicated in the present application correspond to percentages by mass of active ingredient.
  • the lubricant composition used according to the invention may comprise any type of mineral, synthetic or natural lubricating base oil, animal or vegetable, known to those skilled in the art.
  • the base oils used in the lubricant compositions according to the invention may be oils of mineral or synthetic origins belonging to groups I to V according to the classes defined in the API classification (or their equivalents according to the ATIEL classification) (Table A) or their mixtures.
  • the mineral base oils according to the invention include all types of base oils obtained by atmospheric and vacuum distillation of crude oil, followed by operations such as solvent extraction, desalphating, solvent dewaxing, hydrotreating, hydrocracking, hydroisomerization and hydrofinishing.
  • Mixtures of synthetic and mineral oils can also be used.
  • lubricating bases for producing the lubricating compositions used according to the invention, except that they must have properties, in particular viscosity, viscosity index, sulfur, oxidation resistance, adapted for use for engines or for vehicle transmissions.
  • the base oils of the lubricant compositions used according to the invention may also be chosen from synthetic oils, such as certain carboxylic acid esters and alcohols, and from polyalphaolefins.
  • the polyalphaolefins used as base oils are, for example, obtained from monomers comprising from 4 to 32 carbon atoms, for example from octene, decene or dodecene, and whose viscosity at 100 ° C. is between 1, 5 and 15 mm 2.
  • the base oils of the present invention are chosen from the above base oils whose aromatic content is between 0 and 45%, preferably between 0 and 30%.
  • the aromatic content of the oils is measured according to UV Burdett method.
  • the lubricant composition used according to the invention comprises at least 50% by weight of base oils relative to the total mass of the composition. More advantageously, the lubricant composition used according to the invention comprises at least 60% by weight, or even at least 70% by weight, of base oils relative to the total mass of the composition.
  • the lubricant composition used according to the invention comprises from 60 to 99.5% by weight of base oils, preferably from 70 to 99.5% by weight of base oils, relative to the total mass of the composition.
  • base oils preferably from 70 to 99.5% by weight of base oils, relative to the total mass of the composition.
  • Many additives can be used for this lubricant composition used according to the invention.
  • the preferred additives for the lubricant composition used according to the invention are chosen from friction modifiers, detergents, anti-wear additives, extreme pressure additives, viscosity index improvers, dispersants, antioxidants, pour point improvers, defoamers, thickeners and mixtures thereof.
  • the lubricant composition used according to the invention comprises at least one antiwear additive, at least one extreme pressure additive or their mixtures.
  • Anti-wear additives and extreme pressure additives protect friction surfaces by forming a protective film adsorbed on these surfaces.
  • the anti-wear additives are chosen from phosphosulfur additives such as metal alkylthiophosphates, in particular zinc alkylthiophosphates, and more specifically zinc dialkyldithiophosphates or ZnDTPs.
  • the preferred compounds have the formula Zn ((SP (S) (OR 3 ) (OR 4 )) 2 , in which R 3 and R 4 , which may be identical or different, independently represent an alkyl group, preferably an alkyl group containing from 1 to 18 carbon atoms.
  • Amine phosphates are also anti-wear additives which can be used in the lubricating composition according to the invention.
  • the phosphorus provided by these additives can act as a poison of the catalytic systems of automobiles because these additives are ash generators.
  • these effects can be minimized by partially substituting amine phosphates with non-phosphorus additives, such as, for example, polysulfides, especially sulfur-containing olefins.
  • the lubricant composition according to the invention may comprise from 0.01 to 6% by weight, preferably from 0.05 to 4% by weight, more preferably from 0.1 to 2% by weight relative to the mass. total lubricating composition, anti-wear additives and extreme pressure additives.
  • the lubricant composition according to the invention may comprise at least one friction-modifying additive.
  • the friction modifying additive may be chosen from a compound providing metal elements and an ash-free compound.
  • the compounds providing metal elements mention may be made of transition metal complexes such as Mo, Sb, Sn, Fe, Cu and Zn, the ligands of which may be hydrocarbon compounds comprising oxygen, nitrogen, sulfur or phosphorus.
  • the ashless friction modifier additives are generally of organic origin and may be selected from monoesters of fatty acids and polyols, alkoxylated amines, alkoxylated fatty amines, fatty epoxides, borate fatty epoxides; fatty amines or fatty acid glycerol esters.
  • the fatty compounds comprise at least one hydrocarbon group comprising from 10 to 24 carbon atoms.
  • the lubricating composition according to the invention may comprise from 0.01 to 2% by weight or from 0.01 to 5% by weight, preferably from 0.1 to 1.5% by weight. mass or 0.1 to 2% by weight relative to the total mass of the lubricant composition, friction modifier additive.
  • the lubricant composition according to the invention may comprise at least one antioxidant additive.
  • the antioxidant additive generally serves to retard the degradation of the lubricating composition in service. This degradation can notably result in the formation of deposits, the presence of sludge or an increase in the viscosity of the lubricant composition.
  • Antioxidant additives act in particular as radical inhibitors or destroyers of hydroperoxides.
  • antioxidant additives commonly used, mention may be made of antioxidant additives of phenolic type, antioxidant additives of amine type, antioxidant phosphosulfur additives. Some of these antioxidant additives, for example phosphosulfur antioxidant additives, can be ash generators. Phenolic antioxidant additives may be ash-free or may be in the form of neutral or basic metal salts.
  • the antioxidant additives may especially be chosen from sterically hindered phenols, sterically hindered phenol esters and sterically hindered phenols comprising a thioether bridge, diphenylamines, diphenylamines substituted with at least one C 1 -C 12 alkyl group, ⁇ , ⁇ '-dialkyl-aryl diamines and mixtures thereof.
  • the sterically hindered phenols are chosen from compounds comprising a phenol group in which at least one vicinal carbon of the carbon carrying the alcohol function is substituted by at least one alkyl group in the form of d-C 10 , preferably a grouping.
  • Amino compounds are another class of antioxidant additives that can be used, optionally in combination with phenolic antioxidant additives.
  • amine compounds are aromatic amines, for example aromatic amines of formula NR 5 R 6 R 7 in which R 5 represents an optionally substituted aliphatic or aromatic group, R 6 represents an optionally substituted aromatic group, R 5 7 represents a hydrogen atom, an alkyl group, an aryl group or a group of formula R 8 S (O) z R 9 in which R 8 represents an alkylene group or an alkenylene group, R 9 represents an alkyl group, a alkenyl group or an aryl group and z represents 0, 1 or 2.
  • Sulfurized alkyl phenols or their alkali and alkaline earth metal salts can also be used as antioxidant additives.
  • antioxidant additives is copper compounds, for example copper thio- or dithio-phosphates, copper and carboxylic acid salts, dithiocarbamates, sulphonates, phenates, copper acetylacetonates. Copper salts I and II, succinic acid or anhydride salts can also be used.
  • the lubricant composition according to the invention may contain all types of antioxidant additives known to those skilled in the art.
  • the lubricating composition comprises at least one ash-free antioxidant additive.
  • the lubricating composition according to the invention comprises from 0.5 to 2% by weight relative to the total weight of the composition, of at least one antioxidant additive.
  • the lubricant composition according to the invention may also comprise at least one detergent additive.
  • the detergent additives generally make it possible to reduce the formation of deposits on the surface of the metal parts by dissolving the secondary oxidation and combustion products.
  • the detergent additives that can be used in the lubricant composition according to the invention are generally known to those skilled in the art.
  • the detergent additives may be anionic compounds comprising a long lipophilic hydrocarbon chain and a hydrophilic head.
  • the associated cation may be a metal cation of an alkali metal or alkaline earth metal.
  • the detergent additives are preferably chosen from the alkali metal or alkaline earth metal salts of carboxylic acids, the sulphonates, the salicylates, the naphthenates and the phenate salts.
  • the alkali and alkaline earth metals are preferably calcium, magnesium, sodium or barium.
  • metal salts generally comprise the metal in stoichiometric amount or in excess, therefore in an amount greater than the stoichiometric amount. It is then overbased detergent additives; the excess metal bringing the overbased character to the detergent additive is then generally in the form of an oil insoluble metal salt, for example a carbonate, a hydroxide, an oxalate, an acetate, a glutamate, preferably a carbonate .
  • the lubricant composition according to the invention may comprise from 0.5 to 4% by weight of detergent additive relative to the total mass of the lubricant composition.
  • the lubricant composition according to the invention may also comprise at least one pour point depressant additive.
  • pour point depressant additives By slowing the formation of paraffin crystals, pour point depressant additives generally improve the cold behavior of the lubricant composition according to the invention.
  • pour point depressant additives mention may be made of alkyl polymethacrylates, polyacrylates, polyarylamides, polyalkylphenols, polyalkylnaphthalenes and alkylated polystyrenes.
  • the lubricant composition according to the invention may also comprise at least one dispersing agent.
  • the dispersing agent may be chosen from Mannich bases, succinimides and their derivatives.
  • the lubricating composition according to the invention may comprise from 0.2 to 10% by weight of dispersing agent relative to the total mass of the lubricating composition.
  • the lubricating composition of the present invention may also comprise at least one viscosity index improving additive.
  • additives improving the viscosity number include polymeric esters, homopolymers or copolymers, hydrogenated or non-hydrogenated, styrene, butadiene and isoprene, polyacrylates, polymethacrylates (PMA) or alternatively olefin copolymers, in particular ethylene / propylene copolymers.
  • the lubricating composition according to the invention can be in various forms.
  • the lubricant composition according to the invention may in particular be an anhydrous composition.
  • this lubricating composition is not an emulsion.
  • the lubricant composition defined above is used to improve the cleanliness of a 4-stroke vehicle engine.
  • the 4-stroke vehicle lubricating composition is preferably characterized by a BN of less than 15, preferably less than 10. BN is determined according to ASTM D-2896.
  • vehicle engine lubricants generally include little detergent.
  • vehicle engine is more particularly intended to mean vehicle engines such as:
  • gasoline engines including petrol and diesel engines, but also gas and petrol engines (dual fuel gas / gasoline engines), gas and diesel engines (dual fuel gas engines / diesel) as well as engines running on gasoline and diesel fuel;
  • Figure 1 Photo of a piston bottom after an engine test with a comparative composition (CC1).
  • Figure 2 Photo of a piston bottom after a motor test with a composition according to the invention (CI8).
  • Example 1 Lubricating compositions according to the invention
  • Gr III base oil (kinematic viscosity at 100 ° C
  • Gr III base oil (kinematic viscosity at 100 ° C
  • PAO base oil (kinematic viscosity at
  • succinimide an antioxidant amine
  • an antioxidant amine an antioxidant
  • Lubricating compositions according to the invention are then prepared CM, CI2, CI3, CI4, CI5, CI6, CI7 depending on the nature and amounts (% by weight) presented in Table 2.
  • the engine clean performance on the lubricant compositions CI8 and CC1 are evaluated according to the following method.
  • Each lubricating composition (8 kg) is evaluated during a cleanliness test of a diesel engine with a common rail for cars.
  • the engine has a displacement of 1, 4 L for 4 cylinders. Its power is 80 kW.
  • the cycle time of the test is 96 hours alternating idle speed and 4 000 rpm.
  • the temperature of the lubricating composition is 145 ° C. and the temperature of the water of the cooling system is 100 ° C. No emptying or extra makeup composition is performed during the test. EN 590 fuel is used.
  • the test is carried out in two phases for a total duration of 106 hours and in a first rinsing and lapping step for 10 hours and then in a second step with the evaluated composition (4 kg), finally according to an endurance stage lasting 96 hours with the evaluated composition (4 kg).
  • Example 2 The results confirm those of Example 2 as regards the improvement of the engine cleanliness of a lubricating composition comprising an alcohol according to the invention (lubricating composition CI8) compared to a lubricating composition comprising no alcohol according to the invention. (lubricant composition CC1).
  • compositions of Table 8 were tested for their cold properties:
  • the viscosity of the compositions according to the invention is lower than for the comparative composition.
  • This MRV test makes it possible to simulate the conditions of lubrication of the engine during the cold start and in particular the pumpability of the lubricant during the cold start. Therefore, the compositions according to the invention have better cold pumpability than the compositions that do not comprise fatty alcohol.
  • compositions according to the invention are lower than for the comparative composition.
  • This CCS test makes it possible to simulate the conditions of lubrication of the engine during the cold start and in particular that the fluidity of the cold lubricant allowing the starting of the engine. Therefore, the compositions according to the invention have a better cold flowability than compositions comprising no fatty alcohol.

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Abstract

The invention relates to the use of an alcohol of formula R-OH (I), in which R is a linear or branched saturated alkyl group with 10 to 36 carbon atoms, in a lubricant composition to improve the cleanliness of a 4-stroke vehicle engine.

Description

UTILISATION DE COMPOSITIONS LUBRIFIANTES POUR AMELIORER LA PROPRETE D'UN MOTEUR DE VEHICULE 4-TEMPS  USE OF LUBRICATING COMPOSITIONS TO IMPROVE THE CLEAN OF A 4-STROKE VEHICLE ENGINE

L'invention concerne l'utilisation d'une composition lubrifiante pour améliorer la propreté d'un moteur de véhicule 4-temps. Plus particulièrement, l'invention concerne l'utilisation d'un alcool dans une composition lubrifiante pour améliorer la propreté d'un moteur de véhicule 4-temps. The invention relates to the use of a lubricant composition for improving the cleanliness of a 4-stroke vehicle engine. More particularly, the invention relates to the use of an alcohol in a lubricating composition to improve the cleanliness of a 4-stroke vehicle engine.

Les développements des moteurs et des performances des compositions lubrifiantes pour moteur sont indissociablement liés. Plus les moteurs ont une conception complexe, plus le rendement et l'optimisation de la consommation sont élevés et plus la composition lubrifiante pour moteur est sollicitée et doit améliorer ses performances. Engine developments and performance of engine lubricating compositions are inextricably linked. The more the engines have a complex design, the higher the efficiency and the optimization of the consumption, the more the engine lubricating composition is solicited and must improve its performance.

Une compression très élevée dans le moteur, des températures de piston supérieures, en particulier dans la zone du segment de piston supérieur, des commandes de soupapes modernes et sans entretien avec des poussoirs hydrauliques, ainsi que des températures très élevées dans l'espace moteur sollicitent de manière croissante les lubrifiants pour les moteurs modernes.  Very high compression in the engine, higher piston temperatures, particularly in the area of the upper piston ring, modern and maintenance-free valve controls with hydraulic lifters, and very high temperatures in the engine space demand increasingly lubricants for modern engines.

Les conditions d'utilisation des moteurs à essence et des moteurs diesel incluent aussi bien des parcours extrêmement courts que de longs trajets. En effet, 80 % des trajets des voitures d'Europe occidentale sont inférieurs à 12 kilomètres alors que des véhicules parcourent des kilométrages annuels allant jusqu'à 300 000 km.  The conditions of use of gasoline engines and diesel engines include extremely short journeys as well as long journeys. In fact, 80% of the journeys of Western European cars are less than 12 kilometers while vehicles cover annual mileages of up to 300 000 km.

Les intervalles de vidange sont également très variables, de 5 000 km pour certains petits moteurs diesel, ils peuvent aller jusqu'à 100 000 km sur des moteurs diesel de véhicules utilitaires modernes.  The emptying intervals are also very variable, from 5,000 km for some small diesel engines to up to 100,000 km on modern commercial diesel engines.

Les compositions lubrifiantes et notamment les compositions lubrifiantes pour véhicules à moteur doivent donc posséder des propriétés et des performances améliorées. Lubricating compositions and especially lubricating compositions for motor vehicles must therefore have improved properties and performance.

De plus les moteurs de véhicule 4-temps nécessitent d'avoir des propriétés à froid importantes. Un problème rencontré lors de l'utilisation de compositions lubrifiantes connues concerne la dégradation et la cokéfaction des huiles ou des additifs utilisés. Ces phénomènes de dégradation et de cokéfaction peuvent entraîner un encrassement des pièces lubrifiées, en particulier au sein d'un moteur pour véhicule. In addition 4-stroke vehicle engines need to have significant cold properties. A problem encountered when using known lubricating compositions is the degradation and coking of the oils or additives used. These phenomena of degradation and coking can lead to fouling of the lubricated parts, in particular within a vehicle engine.

Il est donc nécessaire de disposer de compositions lubrifiantes permettant d'améliorer la propreté d'un moteur de véhicule 4-temps. L'amélioration de la propreté d'un tel moteur comprend généralement la réduction de la formation de dépôts, notamment la formation de dépôts à haute température tels que les vernis, les laques ou les dépôts de carbone ou de coke. De tels dépôts peuvent se former sur les surfaces chaudes des pièces du moteur tels que les fonds de gorge des pistons, les axes des turbos ou encore les compresseurs d'air. Les substances présentes au sein des compositions lubrifiantes peuvent s'oxyder au contact des surfaces chaudes du moteur et générer la formation de produits insolubles formant des dépôts. Ces dépôts peuvent encrasser le moteur et provoquer des problèmes d'usure, de grippage, de gommage des segments ainsi que des problèmes de rotation du turbo par exemple. Généralement, des additifs de type détergents ou dispersants sont utilisés pour améliorer la propreté d'un moteur de véhicule 4-temps. It is therefore necessary to have lubricating compositions for improving the cleanliness of a 4-stroke vehicle engine. Improving the cleanliness of such an engine generally includes reducing the formation of deposits, including training high temperature deposits such as varnishes, lacquers or deposits of carbon or coke. Such deposits may be formed on the hot surfaces of the engine parts such as piston throat bottoms, turbos axes or air compressors. The substances present in the lubricating compositions can oxidize in contact with the hot surfaces of the engine and generate the formation of insoluble products forming deposits. These deposits can foul the engine and cause problems of wear, seizing, scrubbing segments and turbo rotation problems for example. Generally, detergent or dispersant type additives are used to improve the cleanliness of a 4-stroke vehicle engine.

Il est connu de WO2015/179280 des compositions lubrifiantes comprenant des alcools gras insaturés. Cependant, ce type d'alcool gras devient solide à des températures de l'ordre de 10°C et ne permettent donc pas d'atteindre des propriétés à froid satisfaisantes. Il est donc également nécessaire de disposer de compositions lubrifiantes permettant d'avoir de bonnes propriétés à froid.  It is known from WO2015 / 179280 lubricating compositions comprising unsaturated fatty alcohols. However, this type of fatty alcohol becomes solid at temperatures of the order of 10 ° C and therefore do not achieve satisfactory cold properties. It is therefore also necessary to have lubricating compositions for having good cold properties.

Ces problématiques d'encrassement concernent également les moteurs des véhicules hybrides ou microhybrides équipés du système "Stop and Start" aussi appelé dispositif d'arrêts et de redémarrages automatiques. These problems of fouling also concern the engines of hybrid or microhybrid vehicles equipped with the system "Stop and Start" also known as automatic stop and start device.

Dans les moteurs automobiles, notamment moteur 4-Temps, les dépôts (encrassement du moteur) sont dus au vieillissement du lubrifiant. Au contraire, dans les moteurs marins 2-Temps, les dépôts sont dus à la combustion du mélange lubrifiant et carburant ceci du fait de la spécificité du fonctionnement des moteurs marins 2-Temps. (on parle de graissage perdu). In automotive engines, including 4-stroke engine, deposits (engine fouling) are due to aging of the lubricant. On the contrary, in 2-stroke marine engines, the deposits are due to the combustion of the lubricant and fuel mixture because of the specificity of the operation of marine engines 2-Temps. (We talk about lost lubrication)

Il est donc nécessaire, pour les moteurs de véhicule, notamment automobile, notamment 4-Temps, de fournir des compositions lubrifiantes qi puisse être résistante et notamment subir le moins possible de dégradation chimique lors du fonctionnement du moteur pour limiter le vieillissement de la composition lubrifiante et par conséquent les dépôts. Cela ne s'avère pas nécessaire pour les moteurs marins puisque le lubrifiant subira toujours la combustion en mélange avec le carburant.  It is therefore necessary, for vehicle engines, in particular automobile, especially 4-Time, to provide lubricant compositions that can be resistant and in particular to undergo the least possible chemical degradation during operation of the engine to limit the aging of the lubricant composition and therefore the deposits. This is not necessary for marine engines since the lubricant will always burn in mixture with the fuel.

Un objectif de la présente invention est donc de fournir des composés ainsi qu'une composition lubrifiante comprenant ces composés palliant tout ou partie aux inconvénients précités. Un autre objectif de la présente invention est de fournir une composition lubrifiante permettant d'améliorer la propreté d'un moteur de véhicule 4-temps et dont la formulation est facile à mettre en œuvre. An object of the present invention is therefore to provide compounds as well as a lubricating composition comprising these compounds which overcomes all or part of the aforementioned drawbacks. Another object of the present invention is to provide a lubricant composition for improving the cleanliness of a 4-stroke vehicle engine and whose formulation is easy to implement.

Un autre objectif de la présente invention est de fournir une composition lubrifiante permettant d'améliorer la propreté d'un moteur de véhicule 4-temps et de diminuer la teneur en additifs détergents ou dispersants.  Another object of the present invention is to provide a lubricant composition to improve the cleanliness of a 4-stroke vehicle engine and to reduce the content of detergent or dispersant additives.

Un autre objectif encore de la présente invention est de fournir une composition lubrifiante permettant d'améliorer la propreté d'un moteur de véhicule 4-temps, toute en conservant de bonnes propriétés à froid.  Yet another object of the present invention is to provide a lubricant composition for improving the cleanliness of a 4-stroke vehicle engine while retaining good cold properties.

L'invention ainsi a pour objet l'utilisation d'un alcool de formule (I) The invention thus relates to the use of an alcohol of formula (I)

R-OH  R-OH

(I)  (I)

dans laquelle R représente un groupement alkyl linéaire ou ramifié, saturé, comprenant de 10 à 36 atomes de carbone, de préférence de 12 à 36 atomes de carbone, préférentiellement de 12 à 24 atomes de carbone, encore plus préférentiellement de 12 à 18 atomes de carbone, in which R represents a saturated linear or branched alkyl group comprising from 10 to 36 carbon atoms, preferably from 12 to 36 carbon atoms, preferentially from 12 to 24 carbon atoms, even more preferably from 12 to 18 carbon atoms, carbon,

dans une composition lubrifiante pour améliorer la propreté d'un moteur de véhicule 4- temps. in a lubricating composition to improve the cleanliness of a 4-stroke vehicle engine.

L'amélioration de la propreté moteur selon l'invention est considéré comme l'amélioration de la propreté moteur par comparaison avec ce qui est obtenu pour une composition lubrifiante ne comprenant pas d'alcool selon l'invention. De manière surprenante, la demanderesse a constaté que la présence d'au moins un alcool de formule (I) dans une composition lubrifiante permet d'améliorer la propreté d'un moteur de véhicule 4-temps. La demanderesse a également constaté que la présence d'au moins un alcool de formule (I) permet en outre de conserver de bonnes propriétés à froid du lubrifiant. The improvement of the engine cleanliness according to the invention is considered as improving the engine cleanliness compared to what is obtained for a lubricating composition not comprising any alcohol according to the invention. Surprisingly, the Applicant has found that the presence of at least one alcohol of formula (I) in a lubricant composition makes it possible to improve the cleanliness of a 4-stroke vehicle engine. The Applicant has also found that the presence of at least one alcohol of formula (I) also makes it possible to retain good cold properties of the lubricant.

Avantageusement, les compositions lubrifiantes selon l'invention présentent de bonnes propriétés d'amélioration de la propreté une fois mise en œuvre dans un moteur, ceci permettant de diminuer la teneur en additifs détergents dans lesdites compositions lubrifiantes. De préférence, l'alcool est choisi parmi les composés de formule (I) dans laquelle R représente un groupement alkyl ramifié saturé comprenant de 10 à 36 atomes de carbone de préférence de 12 à 36 atomes de carbone, préférentiellement de 12 à 24 atomes de carbone, encore plus préférentiellement de 12 à 18 atomes de carbone. Advantageously, the lubricant compositions according to the invention have good properties for improving the cleanliness once implemented in an engine, this making it possible to reduce the content of detergent additives in said lubricating compositions. Preferably, the alcohol is chosen from compounds of formula (I) in which R represents a saturated branched alkyl group comprising from 10 to 36 carbon atoms preferably from 12 to 36 carbon atoms, preferably from 12 to 24 carbon atoms, more preferably from 12 to 18 carbon atoms.

Les inventeurs ont montré qu'un alcool présentant une chaîne alkyle comprenant plus de 36 atomes de carbone était solide. Ainsi, lors du démarrage à froid la composition n'est pas suffisamment fluide et ne permet donc pas de jouer son rôle. Par ailleurs, les inventeurs ont montré qu'un alcool présentant une chaîne alkyle comprenant moins de 10 atomes de carbone était très volatile. Ainsi, lors du fonctionnement du moteur, à chaud, l'alcool se volatilise et ne peut donc plus jouer son rôle. Le choix de l'alcool est donc primordial dans le cadre de l'invention. The inventors have shown that an alcohol having an alkyl chain comprising more than 36 carbon atoms was solid. Thus, during the cold start the composition is not sufficiently fluid and therefore does not play its role. Moreover, the inventors have shown that an alcohol having an alkyl chain comprising less than 10 carbon atoms was very volatile. Thus, during operation of the engine, hot, the alcohol is volatilized and can no longer play its role. The choice of alcohol is therefore essential in the context of the invention.

De préférence, l'alcool de formule (I) est de formule (la) Preferably, the alcohol of formula (I) is of formula (Ia)

R1-C(R2)(H)-CH2-OH (la) R 1 -C (R 2 ) (H) -CH 2 -OH (la)

dans laquelle R1 et R2 sont des alkyls linéaires ou ramifiés saturés choisis de façon à ce que le composé de formule (la) comprennent de 10 à 36 atomes de carbone, de préférence de 12 à 36 atomes de carbone, préférentiellement de 12 à 24 atomes de carbone, encore plus préférentiellement de 12 à 18 atomes de carbone. in which R 1 and R 2 are linear or branched saturated alkyls chosen so that the compound of formula (la) comprises from 10 to 36 carbon atoms, preferably from 12 to 36 carbon atoms, preferably from 12 to 24 carbon atoms, more preferably 12 to 18 carbon atoms.

Les alcools selon l'invention sont commercialisés par la société Ecogreen Oleochemicals sous les dénominations Ecorol 12/98®, Ecorol 14/98® et Ecorol 16/98® ou encore par la société Sasol sous la dénomination Isofol®. The alcohols according to the invention are marketed by Ecogreen Oleochemicals under the names Ecorol 12 / 98®, Ecorol 14 / 98® and Ecorol 16 / 98® or by the company Sasol under the name Isofol®.

De façon avantageuse, les alcools de formule (I) avec R ramifié, ou les alcools de formule (la), qui sont des alcools ramifiés, sont liquides à des températures inférieures à 0°C (bas point de fusion), ce qui permet une utilisation optimisée des compositions lubrifiantes dans les moteurs de véhicule 4-temps selon l'invention. En effet, les compositions lubrifiantes comprenant ces alcools présentent de bonnes propriétés à froid. Advantageously, the alcohols of formula (I) with branched R, or the alcohols of formula (Ia), which are branched alcohols, are liquid at temperatures below 0 ° C. (low melting point), which allows optimized use of lubricating compositions in 4-stroke vehicle engines according to the invention. Indeed, the lubricant compositions comprising these alcohols have good cold properties.

De préférence, la composition lubrifiante comprend de 0,1 à 10%, en poids, préférentiellement de 0,1 à 4% en poids, plus préférentiellement de 0,2 à 3% en poids, avantageusement de 0,3 à 2,5% en poids d'alcool par rapport au poids total de la composition lubrifiante. Preferably, the lubricating composition comprises from 0.1 to 10% by weight, preferably from 0.1 to 4% by weight, more preferably from 0.2 to 3% by weight, advantageously from 0.3 to 2.5% by weight. % by weight of alcohol relative to the total weight of the lubricant composition.

La présente invention concerne également une composition lubrifiante pour moteur de véhicule 4-temps, comprenant : The present invention also relates to a lubricant composition for a 4-stroke vehicle engine, comprising:

- au moins une huile de base ; et  at least one base oil; and

- au moins un alcool de formule (I) tel que défini ci-dessus. La présente demande concerne également l'utilisation de la composition lubrifiante selon l'invention pour améliorer la propreté d'un moteur de véhicule 4-temps. at least one alcohol of formula (I) as defined above. The present application also relates to the use of the lubricant composition according to the invention for improving the cleanliness of a 4-stroke vehicle engine.

L'invention concerne également un procédé pour améliorer la propreté d'un moteur de véhicule 4-temps, ledit procédé comprenant au moins une étape de mise en contact d'une pièce mécanique de la machine avec une composition lubrifiante telle que définie ci- dessus. The invention also relates to a method for improving the cleanliness of a 4-stroke vehicle engine, said method comprising at least one step of bringing a mechanical part of the machine into contact with a lubricating composition as defined above. .

Les pourcentages indiqués dans la présente demande correspondent à des pourcentages en masse de matière active. The percentages indicated in the present application correspond to percentages by mass of active ingredient.

De manière générale, la composition lubrifiante utilisée selon l'invention peut comprendre tout type d'huile de base lubrifiante minérale, synthétique ou naturelle, animale ou végétale, connue de l'Homme du métier. In general, the lubricant composition used according to the invention may comprise any type of mineral, synthetic or natural lubricating base oil, animal or vegetable, known to those skilled in the art.

Les huiles de base utilisées dans les compositions lubrifiantes selon l'invention peuvent être des huiles d'origines minérales ou synthétiques appartenant aux groupes I à V selon les classes définies dans la classification API (ou leurs équivalents selon la classification ATIEL) (tableau A) ou leurs mélanges. The base oils used in the lubricant compositions according to the invention may be oils of mineral or synthetic origins belonging to groups I to V according to the classes defined in the API classification (or their equivalents according to the ATIEL classification) (Table A) or their mixtures.

Figure imgf000006_0001
Figure imgf000006_0001

Tableau A  Table A

Les huiles de base minérales selon l'invention incluent tous types d'huiles de base obtenues par distillation atmosphérique et sous vide du pétrole brut, suivies d'opérations de raffinage telles qu'extraction au solvant, désalphatage, déparaffinage au solvant, hydrotraitement, hydrocraquage, hydroisomérisation et hydrofinition. The mineral base oils according to the invention include all types of base oils obtained by atmospheric and vacuum distillation of crude oil, followed by operations such as solvent extraction, desalphating, solvent dewaxing, hydrotreating, hydrocracking, hydroisomerization and hydrofinishing.

Des mélanges d'huiles synthétiques et minérales peuvent également être employés. Mixtures of synthetic and mineral oils can also be used.

Il n'existe généralement aucune limitation quant à l'emploi de bases lubrifiantes différentes pour réaliser les compositions lubrifiantes utilisées selon l'invention, si ce n'est qu'elles doivent avoir des propriétés, notamment de viscosité, indice de viscosité, teneur en soufre, résistance à l'oxydation, adaptées à une utilisation pour des moteurs ou pour des transmissions de véhicule. There is generally no limitation on the use of different lubricating bases for producing the lubricating compositions used according to the invention, except that they must have properties, in particular viscosity, viscosity index, sulfur, oxidation resistance, adapted for use for engines or for vehicle transmissions.

Les huiles de bases des compositions lubrifiantes utilisées selon l'invention peuvent également être choisies parmi les huiles synthétiques, telles certains esters d'acides carboxyliques et d'alcools, et parmi les polyalphaoléfines. Les polyalphaoléfines utilisées comme huiles de base sont par exemple obtenues à partir de monomères comprenant de 4 à 32 atomes de carbone, par exemple à partir d'octène, décène ou de dodécène, et dont la viscosité à 100 °C est comprise entre 1 ,5 et 15 mm2. s"1 selon la norme ASTM D445. Leur masse moléculaire moyenne est généralement comprise entre 250 et 3 000 selon la norme ASTM D5296. The base oils of the lubricant compositions used according to the invention may also be chosen from synthetic oils, such as certain carboxylic acid esters and alcohols, and from polyalphaolefins. The polyalphaolefins used as base oils are, for example, obtained from monomers comprising from 4 to 32 carbon atoms, for example from octene, decene or dodecene, and whose viscosity at 100 ° C. is between 1, 5 and 15 mm 2. s "1 according to the ASTM D445 standard, their average molecular weight is generally between 250 and 3000 according to the ASTM D5296 standard.

De manière préférée, les huiles de base de la présente invention sont choisies parmi les huiles de base ci-dessus dont la teneur en aromatique est comprise entre 0 et 45%, de préférence entre 0 et 30%. La teneur en aromatique des huiles est mesurée selon la méthode UV Burdett.  Preferably, the base oils of the present invention are chosen from the above base oils whose aromatic content is between 0 and 45%, preferably between 0 and 30%. The aromatic content of the oils is measured according to UV Burdett method.

De manière avantageuse, la composition lubrifiante utilisée selon l'invention comprend au moins 50 % en masse d'huiles de base par rapport à la masse totale de la composition. De manière plus avantageuse, la composition lubrifiante utilisée selon l'invention comprend au moins 60 % en masse, voire au moins 70 % en masse, d'huiles de base par rapport à la masse totale de la composition.  Advantageously, the lubricant composition used according to the invention comprises at least 50% by weight of base oils relative to the total mass of the composition. More advantageously, the lubricant composition used according to the invention comprises at least 60% by weight, or even at least 70% by weight, of base oils relative to the total mass of the composition.

De manière plus particulièrement avantageuse, la composition lubrifiante utilisée selon l'invention comprend de 60 à 99,5% en masse d'huiles de base, de préférence de 70 à 99,5 % en masse d'huiles de base, par rapport à la masse totale de la composition. De nombreux additifs peuvent être utilisés pour cette composition lubrifiante utilisée selon l'invention.  More particularly advantageously, the lubricant composition used according to the invention comprises from 60 to 99.5% by weight of base oils, preferably from 70 to 99.5% by weight of base oils, relative to the total mass of the composition. Many additives can be used for this lubricant composition used according to the invention.

Les additifs préférés pour la composition lubrifiante utilisée selon l'invention sont choisis parmi les modificateurs de frottements, les détergents, les additifs anti-usure, les additifs extrême-pression, les améliorants de l'indice de viscosité, les dispersants, les antioxydants, les améliorants du point d'écoulement, les anti-mousse, les épaississants et leurs mélanges. De manière préférée, la composition lubrifiante utilisée selon l'invention comprend au moins un additif anti-usure, au moins un additif extrême pression ou leurs mélanges. Les additifs anti-usure et les additifs extrême pression protègent les surfaces en frottement par formation d'un film protecteur adsorbé sur ces surfaces. The preferred additives for the lubricant composition used according to the invention are chosen from friction modifiers, detergents, anti-wear additives, extreme pressure additives, viscosity index improvers, dispersants, antioxidants, pour point improvers, defoamers, thickeners and mixtures thereof. Preferably, the lubricant composition used according to the invention comprises at least one antiwear additive, at least one extreme pressure additive or their mixtures. Anti-wear additives and extreme pressure additives protect friction surfaces by forming a protective film adsorbed on these surfaces.

II existe une grande variété d'additifs anti-usure. De manière préférée pour la composition lubrifiante selon l'invention, les additifs anti-usure sont choisis parmi des additifs phospho- soufrés comme les alkylthiophosphates métalliques, en particulier les alkylthiophosphates de zinc, et plus spécifiquement les dialkyldithiophosphates de zinc ou ZnDTP. Les composés préférés sont de formule Zn((SP(S)(OR3)(OR4))2, dans laquelle R3 et R4, identiques ou différents, représentent indépendamment un groupement alkyle, préférentiellement un groupement alkyle comportant de 1 à 18 atomes de carbone. There is a wide variety of anti-wear additives. In a preferred manner for the lubricating composition according to the invention, the anti-wear additives are chosen from phosphosulfur additives such as metal alkylthiophosphates, in particular zinc alkylthiophosphates, and more specifically zinc dialkyldithiophosphates or ZnDTPs. The preferred compounds have the formula Zn ((SP (S) (OR 3 ) (OR 4 )) 2 , in which R 3 and R 4 , which may be identical or different, independently represent an alkyl group, preferably an alkyl group containing from 1 to 18 carbon atoms.

Les phosphates d'amines sont également des additifs anti-usure qui peuvent être employés dans la composition lubrifiante selon l'invention. Toutefois, le phosphore apporté par ces additifs peut agir comme poison des systèmes catalytiques des automobiles car ces additifs sont générateurs de cendres. On peut minimiser ces effets en substituant partiellement les phosphates d'amines par des additifs n'apportant pas de phosphore, tels que, par exemple, les polysulfures, notamment les oléfines soufrées. De manière avantageuse, la composition lubrifiante selon l'invention peut comprendre de 0,01 à 6 % en masse, préférentiellement de 0,05 à 4 % en masse, plus préférentiellement de 0,1 à 2 % en masse par rapport à la masse totale de composition lubrifiante, d'additifs anti-usure et d'additifs extrême-pression. Amine phosphates are also anti-wear additives which can be used in the lubricating composition according to the invention. However, the phosphorus provided by these additives can act as a poison of the catalytic systems of automobiles because these additives are ash generators. These effects can be minimized by partially substituting amine phosphates with non-phosphorus additives, such as, for example, polysulfides, especially sulfur-containing olefins. Advantageously, the lubricant composition according to the invention may comprise from 0.01 to 6% by weight, preferably from 0.05 to 4% by weight, more preferably from 0.1 to 2% by weight relative to the mass. total lubricating composition, anti-wear additives and extreme pressure additives.

De manière avantageuse, la composition lubrifiante selon l'invention peut comprendre au moins un additif modificateur de frottement. L'additif modificateur de frottement peut être choisi parmi un composé apportant des éléments métalliques et un composé exempt de cendres. Parmi les composés apportant des éléments métalliques, on peut citer les complexes de métaux de transition tels que Mo, Sb, Sn, Fe, Cu, Zn dont les ligands peuvent être des composés hydrocarbonés comprenant des atomes d'oxygène, d'azote, de soufre ou de phosphore. Les additifs modificateurs de frottement exempt de cendres sont généralement d'origine organique et peuvent être choisis parmi les monoesters d'acides gras et de polyols, les aminés alcoxylées, les aminés grasses alcoxylées, les époxydes gras, les époxydes gras de borate; les aminés grasses ou les esters de glycérol d'acide gras. Selon l'invention, les composés gras comprennent au moins un groupement hydrocarboné comprenant de 10 à 24 atomes de carbone.  Advantageously, the lubricant composition according to the invention may comprise at least one friction-modifying additive. The friction modifying additive may be chosen from a compound providing metal elements and an ash-free compound. Among the compounds providing metal elements, mention may be made of transition metal complexes such as Mo, Sb, Sn, Fe, Cu and Zn, the ligands of which may be hydrocarbon compounds comprising oxygen, nitrogen, sulfur or phosphorus. The ashless friction modifier additives are generally of organic origin and may be selected from monoesters of fatty acids and polyols, alkoxylated amines, alkoxylated fatty amines, fatty epoxides, borate fatty epoxides; fatty amines or fatty acid glycerol esters. According to the invention, the fatty compounds comprise at least one hydrocarbon group comprising from 10 to 24 carbon atoms.

De manière avantageuse, la composition lubrifiante selon l'invention peut comprendre de 0,01 à 2 % en masse ou de 0,01 à 5 % en masse, préférentiellement de 0,1 à 1 ,5 % en masse ou de 0,1 à 2 % en masse par rapport à la masse totale de la composition lubrifiante, d'additif modificateur de frottement. Advantageously, the lubricating composition according to the invention may comprise from 0.01 to 2% by weight or from 0.01 to 5% by weight, preferably from 0.1 to 1.5% by weight. mass or 0.1 to 2% by weight relative to the total mass of the lubricant composition, friction modifier additive.

De manière avantageuse, la composition lubrifiante selon l'invention peut comprendre au moins un additif antioxydant. Advantageously, the lubricant composition according to the invention may comprise at least one antioxidant additive.

L'additif antioxydant permet généralement de retarder la dégradation de la composition lubrifiante en service. Cette dégradation peut notamment se traduire par la formation de dépôts, par la présence de boues ou par une augmentation de la viscosité de la composition lubrifiante.  The antioxidant additive generally serves to retard the degradation of the lubricating composition in service. This degradation can notably result in the formation of deposits, the presence of sludge or an increase in the viscosity of the lubricant composition.

Les additifs antioxydants agissent notamment comme inhibiteurs radicalaires ou destructeurs d'hydropéroxydes. Parmi les additifs antioxydants couramment employés, on peut citer les additifs antioxydants de type phénolique, les additifs antioxydants de type aminé, les additifs antioxydants phosphosoufrés. Certains de ces additifs antioxydants, par exemple les additifs antioxydants phosphosoufrés, peuvent être générateurs de cendres. Les additifs antioxydants phénoliques peuvent être exempt de cendres ou bien être sous forme de sels métalliques neutres ou basiques. Les additifs antioxydants peuvent notamment être choisis parmi les phénols stériquement encombrés, les esters de phénol stériquement encombrés et les phénols stériquement encombrés comprenant un pont thioéther, les diphénylamines, les diphénylamines substituées par au moins un groupement alkyle en C1-C12, les Ν,Ν'-dialkyle-aryle-diamines et leurs mélanges. Antioxidant additives act in particular as radical inhibitors or destroyers of hydroperoxides. Among the antioxidant additives commonly used, mention may be made of antioxidant additives of phenolic type, antioxidant additives of amine type, antioxidant phosphosulfur additives. Some of these antioxidant additives, for example phosphosulfur antioxidant additives, can be ash generators. Phenolic antioxidant additives may be ash-free or may be in the form of neutral or basic metal salts. The antioxidant additives may especially be chosen from sterically hindered phenols, sterically hindered phenol esters and sterically hindered phenols comprising a thioether bridge, diphenylamines, diphenylamines substituted with at least one C 1 -C 12 alkyl group, Ν , Ν'-dialkyl-aryl diamines and mixtures thereof.

De préférence selon l'invention, les phénols stériquement encombrés sont choisis parmi les composés comprenant un groupement phénol dont au moins un carbone vicinal du carbone portant la fonction alcool est substitué par au moins un groupement alkyle en d- C10, de préférence un groupement alkyle en CrC6, de préférence un groupement alkyle en C4, de préférence par le groupement ter-butyle. Preferably, according to the invention, the sterically hindered phenols are chosen from compounds comprising a phenol group in which at least one vicinal carbon of the carbon carrying the alcohol function is substituted by at least one alkyl group in the form of d-C 10 , preferably a grouping. C 1 -C 6 alkyl, preferably a C 4 alkyl group, preferably by the ter-butyl group.

Les composés aminés sont une autre classe d'additifs antioxydants pouvant être utilisés, éventuellement en combinaison avec les additifs antioxydants phénoliques. Des exemples de composés aminés sont les aminés aromatiques, par exemple les aminés aromatiques de formule NR5R6R7 dans laquelle R5 représente un groupement aliphatique ou un groupement aromatique, éventuellement substitué, R6 représente un groupement aromatique, éventuellement substitué, R7 représente un atome d'hydrogène, un groupement alkyle, un groupement aryle ou un groupement de formule R8S(0)zR9 dans laquelle R8 représente un groupement alkylène ou un groupement alkenylène, R9 représente un groupement alkyle, un groupement alcényle ou un groupement aryle et z représente 0, 1 ou 2. Des alkyl phénols sulfurisés ou leurs sels de métaux alcalins et alcalino-terreux peuvent également être utilisés comme additifs antioxydants. Amino compounds are another class of antioxidant additives that can be used, optionally in combination with phenolic antioxidant additives. Examples of amine compounds are aromatic amines, for example aromatic amines of formula NR 5 R 6 R 7 in which R 5 represents an optionally substituted aliphatic or aromatic group, R 6 represents an optionally substituted aromatic group, R 5 7 represents a hydrogen atom, an alkyl group, an aryl group or a group of formula R 8 S (O) z R 9 in which R 8 represents an alkylene group or an alkenylene group, R 9 represents an alkyl group, a alkenyl group or an aryl group and z represents 0, 1 or 2. Sulfurized alkyl phenols or their alkali and alkaline earth metal salts can also be used as antioxidant additives.

Une autre classe d'additifs antioxydants est celle des composés cuivrés, par exemples les thio- ou dithio-phosphates de cuivre, les sels de cuivre et d'acides carboxyliques, les dithiocarbamates, les sulphonates, les phénates, les acétylacétonates de cuivre. Les sels de cuivre I et II, les sels d'acide ou d'anhydride succiniques peuvent également être utilisés.  Another class of antioxidant additives is copper compounds, for example copper thio- or dithio-phosphates, copper and carboxylic acid salts, dithiocarbamates, sulphonates, phenates, copper acetylacetonates. Copper salts I and II, succinic acid or anhydride salts can also be used.

La composition lubrifiante selon l'invention peut contenir tous types d'additifs antioxydants connus de l'homme du métier.  The lubricant composition according to the invention may contain all types of antioxidant additives known to those skilled in the art.

De manière avantageuse, la composition lubrifiante comprend au moins un additif antioxydant exempt de cendres. Advantageously, the lubricating composition comprises at least one ash-free antioxidant additive.

De manière également avantageuse, la composition lubrifiante selon l'invention comprend de 0,5 à 2 % en poids par rapport à la masse totale de la composition, d'au moins un additif antioxydant.  Also advantageously, the lubricating composition according to the invention comprises from 0.5 to 2% by weight relative to the total weight of the composition, of at least one antioxidant additive.

La composition lubrifiante selon l'invention peut également comprendre au moins un additif détergent. The lubricant composition according to the invention may also comprise at least one detergent additive.

Les additifs détergents permettent généralement de réduire la formation de dépôts à la surface des pièces métalliques par dissolution des produits secondaires d'oxydation et de combustion.  The detergent additives generally make it possible to reduce the formation of deposits on the surface of the metal parts by dissolving the secondary oxidation and combustion products.

Les additifs détergents utilisables dans la composition lubrifiante selon l'invention sont généralement connus de l'homme de métier. Les additifs détergents peuvent être des composés anioniques comprenant une longue chaîne hydrocarbonée lipophile et une tête hydrophile. Le cation associé peut être un cation métallique d'un métal alcalin ou alcalino- terreux.  The detergent additives that can be used in the lubricant composition according to the invention are generally known to those skilled in the art. The detergent additives may be anionic compounds comprising a long lipophilic hydrocarbon chain and a hydrophilic head. The associated cation may be a metal cation of an alkali metal or alkaline earth metal.

Les additifs détergents sont préférentiellement choisis parmi les sels de métaux alcalins ou de métaux alcalino-terreux d'acides carboxyliques, les sulfonates, les salicylates, les naphténates, ainsi que les sels de phénates. Les métaux alcalins et alcalino-terreux sont préférentiellement le calcium, le magnésium, le sodium ou le baryum.  The detergent additives are preferably chosen from the alkali metal or alkaline earth metal salts of carboxylic acids, the sulphonates, the salicylates, the naphthenates and the phenate salts. The alkali and alkaline earth metals are preferably calcium, magnesium, sodium or barium.

Ces sels métalliques comprennent généralement le métal en quantité stœchiométrique ou bien en excès, donc en quantité supérieure à la quantité stœchiométrique. Il s'agit alors d'additifs détergents surbasés ; le métal en excès apportant le caractère surbasé à l'additif détergent est alors généralement sous la forme d'un sel métallique insoluble dans l'huile, par exemple un carbonate, un hydroxyde, un oxalate, un acétate, un glutamate, préférentiellement un carbonate. De manière avantageuse, la composition lubrifiante selon l'invention peut comprendre de 0,5 à 4 % en poids d'additif détergent par rapport à la masse totale de la composition lubrifiante. De manière également avantageuse, la composition lubrifiante selon l'invention peut également comprendre au moins un additif abaisseur de point d'écoulement. These metal salts generally comprise the metal in stoichiometric amount or in excess, therefore in an amount greater than the stoichiometric amount. It is then overbased detergent additives; the excess metal bringing the overbased character to the detergent additive is then generally in the form of an oil insoluble metal salt, for example a carbonate, a hydroxide, an oxalate, an acetate, a glutamate, preferably a carbonate . Advantageously, the lubricant composition according to the invention may comprise from 0.5 to 4% by weight of detergent additive relative to the total mass of the lubricant composition. Also advantageously, the lubricant composition according to the invention may also comprise at least one pour point depressant additive.

En ralentissant la formation de cristaux de paraffine, les additifs abaisseurs de point d'écoulement améliorent généralement le comportement à froid de la composition lubrifiante selon l'invention. By slowing the formation of paraffin crystals, pour point depressant additives generally improve the cold behavior of the lubricant composition according to the invention.

Comme exemple d'additifs abaisseurs de point d'écoulement, on peut citer les polyméthacrylates d'alkyle, les polyacrylates, les polyarylamides, les polyalkylphénols, les polyalkylnaphtalènes, les polystyrènes alkylés. As examples of pour point depressant additives, mention may be made of alkyl polymethacrylates, polyacrylates, polyarylamides, polyalkylphenols, polyalkylnaphthalenes and alkylated polystyrenes.

De manière avantageuse, la composition lubrifiante selon l'invention peut également comprendre au moins un agent dispersant. Advantageously, the lubricant composition according to the invention may also comprise at least one dispersing agent.

L'agent dispersant peut être choisis parmi les bases de Mannich, les succinimides et leurs dérivés.  The dispersing agent may be chosen from Mannich bases, succinimides and their derivatives.

De manière également avantageuse, la composition lubrifiante selon l'invention peut comprendre de 0,2 à 10 % en masse d'agent dispersant par rapport à la masse totale de la composition lubrifiante.  Also advantageously, the lubricating composition according to the invention may comprise from 0.2 to 10% by weight of dispersing agent relative to the total mass of the lubricating composition.

La composition lubrifiante de la présente invention peut également comprendre au moins un additif améliorant l'indice de viscosité. Comme exemples d'additifs améliorant l'indice de viscosité, on peut citer les esters polymères, les homopolymères ou les copolymères, hydrogénés ou non- hydrogénés, du styrène, du butadiène et de l'isoprène, les polyacrylates, les polyméthacrylates (PMA) ou encore les copolymères oléfines, notamment les copolymères ethylène/propylène. The lubricating composition of the present invention may also comprise at least one viscosity index improving additive. Examples of additives improving the viscosity number include polymeric esters, homopolymers or copolymers, hydrogenated or non-hydrogenated, styrene, butadiene and isoprene, polyacrylates, polymethacrylates (PMA) or alternatively olefin copolymers, in particular ethylene / propylene copolymers.

La composition lubrifiante selon l'invention peut se présenter sous différentes formes. La composition lubrifiante selon l'invention peut notamment être une composition anhydre. De manière préférée, cette composition lubrifiante n'est pas une émulsion. The lubricating composition according to the invention can be in various forms. The lubricant composition according to the invention may in particular be an anhydrous composition. Preferably, this lubricating composition is not an emulsion.

La composition lubrifiante définie ci-dessus est utilisée pour améliorer la propreté d'un moteur de véhicule 4-temps. La composition lubrifiante pour véhicule 4-temps est caractérisé de préférence par un BN inférieur à 15, de préférence inférieur à 10. Le BN est déterminé selon la norme ASTM D- 2896. The lubricant composition defined above is used to improve the cleanliness of a 4-stroke vehicle engine. The 4-stroke vehicle lubricating composition is preferably characterized by a BN of less than 15, preferably less than 10. BN is determined according to ASTM D-2896.

De préférence, contrairement au lubrifiant pour moteur marin qui contiennent au moins 5% en poids de détergent, les lubrifiants pour moteur de véhicule comprennent généralement peu de détergent.  Preferably, unlike marine engine lubricant which contains at least 5% by weight of detergent, vehicle engine lubricants generally include little detergent.

Par moteur de véhicule selon l'invention, on entend plus particulièrement les moteurs de véhicules tels que : The term "vehicle engine" according to the invention is more particularly intended to mean vehicle engines such as:

- les moteurs de véhicules automobiles, incluant les moteurs essence et les moteurs diesel mais également les moteurs fonctionnant au gaz et à l'essence (moteurs dual fuel gaz/essence), les moteurs fonctionnant au gaz et au gazole (moteurs dual fuel gaz/gazole) ainsi que les moteurs fonctionnant à l'essence et au gazole ; - motor vehicle engines, including petrol and diesel engines, but also gas and petrol engines (dual fuel gas / gasoline engines), gas and diesel engines (dual fuel gas engines / diesel) as well as engines running on gasoline and diesel fuel;

- les moteurs de véhicules poids lourds, et plus spécifiquement les moteurs de véhicules poids lourds fonctionnant au gaz,  - the engines of heavy goods vehicles, and more specifically the engines of heavy goods vehicles operating on gas,

- les moteurs de véhicule hybride ou microhybride équipé d'un système "Stop and Start".  - Hybrid or microhybrid vehicle engines equipped with a "Stop and Start" system.

Figure 1 : Photo d'un fond de piston après un essai moteur avec une composition comparative (CC1 ). Figure 1: Photo of a piston bottom after an engine test with a comparative composition (CC1).

Figure 2 : Photo d'un fond de piston après un essai moteur avec une composition selon l'invention (CI8). Figure 2: Photo of a piston bottom after a motor test with a composition according to the invention (CI8).

Les différents aspects de l'invention peuvent être illustrés par les exemples non limitatifs qui suivent : Exemple 1 : Compositions lubrifiantes selon l'invention  The various aspects of the invention may be illustrated by the following nonlimiting examples: Example 1: Lubricating compositions according to the invention

On mélange les différents composants de la composition lubrifiante de référence Crefl en fonction de la nature et des quantités présentées dans le tableau 1 .  The various components of the reference lubricant composition Crefl are mixed according to the nature and amounts shown in Table 1.

Cref 1 (% en  Cref 1 (% in

poids)  weight)

Huile de base Gr III (viscosité cinématique à 100°C  Gr III base oil (kinematic viscosity at 100 ° C

33,9  33.9

mesurée selon la nome ASTM D-556 = 4 mm2/s) measured according to ASTM D-556 = 4 mm 2 / s)

Huile de base Gr III (viscosité cinématique à 100°C  Gr III base oil (kinematic viscosity at 100 ° C

20,6  20.6

mesurée selon la nome ASTM D-556 = 7 mm2/s) measured according to ASTM D-556 = 7 mm 2 / s)

Huile de base de type PAO (viscosité cinématique à  PAO base oil (kinematic viscosity at

30,0  30.0

100°C mesurée selon la nome ASTM D-556 = 4 mm2/s) Améliorant de l'indice de viscosité (copolymère oléfine) 5,5100 ° C measured according to ASTM D-556 = 4 mm 2 / s) Viscosity index improver (olefin copolymer) 5.5

Additif abaisseur de point d'écoulement Pour point depressant additive

0,3  0.3

(polymethacrylate)  (Polymethacrylate)

Modificateur de frottement (composé  Friction modifier (composed

0,5  0.5

organomolybdène)  organomolybdenum)

Détergent (sulfonate de calcium) 0,5  Detergent (calcium sulphonate) 0.5

Paquet d'additifs comprenant un dispersant de type  Package of additives comprising a dispersant of the type

succinimide, un anti-oxydant aminé, un anti-oxydant  succinimide, an antioxidant amine, an antioxidant

phénolique, un anti-usure de type dithiophosphate de  phenolic, an anti-wear type dithiophosphate

8,7  8.7

zinc, un détergent de type sulfonate de calcium  zinc, a calcium sulfonate detergent

surbasé, un détergent de type sulfonate de calcium  overbased calcium sulphonate detergent

neutre, un anti-mousse siliconé)  neutral, a silicone antifoam)

Tableau 1  Table 1

On prépare ensuite des compositions lubrifiantes selon l'invention CM , CI2, CI3, CI4, CI5, CI6, CI7 en fonction de la nature et des quantités (% en poids) présentées dans le tableau 2.  Lubricating compositions according to the invention are then prepared CM, CI2, CI3, CI4, CI5, CI6, CI7 depending on the nature and amounts (% by weight) presented in Table 2.

Figure imgf000013_0001
Figure imgf000013_0001

Tableau 2  Table 2

1 Ecorol 12/98® commercialisé par la société Ecogreen Oleochemicals 1 Ecorol 12 / 98® marketed by the company Ecogreen Oleochemicals

2 Ecorol 14/98® commercialisé par la société Ecogreen Oleochemicals 2 Ecorol 14/98® marketed by Ecogreen Oleochemicals

3 Ecorol 16/98® commercialisé par la société Ecogreen Oleochemicals Exemple 2 : évaluation des propriétés d'amélioration de la propreté d'un moteur des compositions lubrifiantes selon l'invention CM à CI7 et de la composition lubrifiante de référence Cref 3 Ecorol 16 / 98® sold by Ecogreen Oleochemicals Example 2: evaluation of the cleanliness of improving properties of an engine lubricating compositions according to the invention CM to IC7 and the lubricating composition reference Cref

Cette évaluation est effectuée par essai PCT effectué selon la norme GFC LU 029 T97 et permet de simuler les performances en propreté moteur d'une composition lubrifiante. Les résultats de cette évaluation sont donnés dans le tableau 3 ; plus la valeur du mérite est élevée, meilleure est la performance de la composition lubrifiante pour améliorer la propreté.

Figure imgf000014_0001
This evaluation is performed by PCT test carried out according to the GFC LU 029 T97 standard and makes it possible to simulate the engine cleanliness performance of a lubricating composition. The results of this evaluation are given in Table 3; the higher the merit value, the better the performance of the lubricant composition to improve cleanliness.
Figure imgf000014_0001

Tableau 3  Table 3

Les résultats montrent que l'utilisation d'un alcool selon l'invention dans une composition lubrifiante permet d'améliorer la propreté d'un moteur (compositions lubrifiantes CM à CI6) par rapport à une composition lubrifiante de référence ne comprenant pas d'alcool selon l'invention (composition lubrifiante Cref). Exemple 3 : évaluation des propriétés d'amélioration de la propreté d'un moteur d'une composition lubrifiante selon l'invention CI8 et d'une composition lubrifiante comparative CC1 The results show that the use of an alcohol according to the invention in a lubricant composition makes it possible to improve the cleanliness of an engine (lubricating compositions CM to CI6) with respect to a reference lubricating composition containing no alcohol. according to the invention (Cref lubricant composition). Example 3 Evaluation of the Engine Cleanliness Improvement Properties of a Lubricating Composition According to the Invention CI8 and a Comparative Lubricating Composition CC1

On mélange les différents composants de la composition lubrifiante selon l'invention CI8 et de la composition lubrifiante comparative CC1 en fonction de la nature et des quantités présentées dans le tableau 4. The various components of the lubricating composition according to the invention CI8 and the comparative lubricating composition CC1 are mixed according to the nature and amounts shown in Table 4.

CI8 CC1  CI8 CC1

Huile de base Gr III (viscosité 62 64  Gr III base oil (viscosity 62 64

cinématique à 100°C mesurée selon kinematic at 100 ° C measured according to

la nome ASTM D-556 = 4 mm2/s) the ASTM name D-556 = 4 mm 2 / s)

Huile de base Gr III (viscosité 15 15  Gr III base oil (viscosity 15 15

cinématique à 100°C mesurée selon kinematic at 100 ° C measured according to

la nome ASTM D-556 = 6 mm2/s) ASTM D-556 = 6 mm 2 / s)

Améliorant de l'indice de viscosité 3,5 3,5  Improving the viscosity index 3.5 3.5

(polymethacrylate) (Polymethacrylate)

Améliorant de l'indice de viscosité 2 2  Viscosity index improver 2 2

(Polyisoprène styrène hydrogéné (Polyisoprene hydrogenated styrene

(PISH)) (Pish))

Additif abaisseur de point 0,2 0,2  Additive reducing point 0.2 0,2

d'écoulement (polymethacrylate) flow (polymethacrylate)

Modificateur de frottement 0,5 0,5  Friction modifier 0,5 0,5

(composé organomolybdène) (organomolybdenum compound)

Paquet d'additifs comprenant un 14,8 14,8 dispersant de type succinimide, un Package of additives including a 14.8 14.8 succinimide dispersant, a

détergent de type sulfonate de sulfonate detergent

calcium, un détergent de type calcium, a type of detergent

carbonate de calcium calcium carbonate

Alcool laurylique4 2 Lauryl alcohol 4 2

Tableau 4  Table 4

4 Ecorol ®12/98 commercialisé par la société Ecogreen Oleochemicals 4 Ecorol ®12 / 98 marketed by the company Ecogreen Oleochemicals

Les performances en propreté moteur sur les compositions lubrifiantes CI8 et CC1 sont évaluées selon la méthode suivante. The engine clean performance on the lubricant compositions CI8 and CC1 are evaluated according to the following method.

Chaque composition lubrifiante (8 Kg) est évaluée lors d'un essai de propreté d'un moteur diesel à rampe d'injection commune (common rail) pour automobile. Le moteur a une cylindrée de 1 ,4 L pour 4 cylindres. Sa puissance est de 80 kW. La durée de cycle de l'essai est de 96 heures en alternant régime de ralenti et régime de 4 000 tours/min. La température de la composition lubrifiante est de 145°C et la température de l'eau du système de refroidissement est de 100°C. Aucune vidange, ni aucun appoint de composition lubrifiante ne sont effectués durant l'essai. On utilise du carburant EN 590. L'essai se déroule en deux phases pour une durée totale de 106 heures et selon une première étape de rinçage et de rodage durant 10 heures puis selon une deuxième étape avec la composition évaluée (4 kg), enfin selon une étape d'endurance d'une durée de 96 heures avec la composition évaluée (4 kg).  Each lubricating composition (8 kg) is evaluated during a cleanliness test of a diesel engine with a common rail for cars. The engine has a displacement of 1, 4 L for 4 cylinders. Its power is 80 kW. The cycle time of the test is 96 hours alternating idle speed and 4 000 rpm. The temperature of the lubricating composition is 145 ° C. and the temperature of the water of the cooling system is 100 ° C. No emptying or extra makeup composition is performed during the test. EN 590 fuel is used. The test is carried out in two phases for a total duration of 106 hours and in a first rinsing and lapping step for 10 hours and then in a second step with the evaluated composition (4 kg), finally according to an endurance stage lasting 96 hours with the evaluated composition (4 kg).

Après cet essai, les pièces moteurs ont été analysées et les 4 pistons cotés selon la norme européenne CEC M02A78. Pour chaque piston, sa cotation du mérite est effectuée puis ensuite, une moyenne de la cotation du mérite piston total des 4 pistons est calculée. Les résultats obtenus sont regroupés dans le tableau 5. After this test, the engine parts were analyzed and the 4 pistons rated according to the European standard CEC M02A78. For each piston, its merit score is made and then, an average of the rating of the total piston merit of the 4 pistons is calculated. The results obtained are summarized in Table 5.

Le passage régulier d'une huile de référence a permis de démonter qu'un écart de 4 points entre deux candidats est significatif. The regular passage of a reference oil made it possible to demonstrate that a difference of 4 points between two candidates is significant.

Plus la valeur de la moyenne de cotation du mérite est élevée, plus la propreté du piston est améliorée et par conséquent, meilleure est la performance de la composition lubrifiante pour améliorer la propreté moteur. Moyenne de cotation du mérite piston composition évaluée The higher the merit score average value, the better the piston cleanliness and therefore the better the performance of the lubricant composition to improve engine cleanliness. Average rating of merit piston rated composition

après essai  after test

CI8 68,5  CI8 68.5

CC1 61 ,6  CC1 61, 6

Tableau 5  Table 5

Les résultats confirment ceux de l'exemple 2 quant à l'amélioration de la propreté moteur d'une composition lubrifiante comprenant un alcool selon l'invention (composition lubrifiante CI8) comparativement à une composition lubrifiante ne comprenant pas d'alcool selon l'invention (composition lubrifiante CC1 ). The results confirm those of Example 2 as regards the improvement of the engine cleanliness of a lubricating composition comprising an alcohol according to the invention (lubricating composition CI8) compared to a lubricating composition comprising no alcohol according to the invention. (lubricant composition CC1).

Par ailleurs, il a également été démontré sur les figures 1 et 2, suite à cet essai, que les fonds de piston sont propres, c'est-à-dire qu'il n'y a pas de dépôts, lorsque la composition CI8 a été mise en œuvre (figure 2), contrairement à la composition CC1 pour laquelle les fonds de piston sont encrassés (figure 1 ). Moreover, it has also been shown in FIGS. 1 and 2, following this test, that the piston bottoms are clean, that is to say that there are no deposits, when the composition CI8 has been implemented (Figure 2), in contrast to the composition CC1 for which the piston bottoms are fouled (Figure 1).

Exemple 4 : évaluation des propriétés d'amélioration de la propreté d'un moteur d'une composition lubrifiante selon l'invention CI9 et d'une composition lubrifiante comparative CC2 EXAMPLE 4 Evaluation of the Cleanliness Improvement Properties of an Engine of a Lubricating Composition According to the Invention CI9 and a Comparative Lubricating Composition CC2

On mélange les différents composants de la composition lubrifiante selon l'invention CI9 et de la composition lubrifiante comparative CC2 en fonction de la nature et des quantités présentées dans le tableau 6. The various components of the lubricating composition according to the invention CI9 and the comparative lubricating composition CC2 are mixed according to the nature and amounts shown in Table 6.

CI9 CC2  CI9 CC2

Huile de base Gr III (viscosité 71 ,1 72,1  Gr III base oil (viscosity 71, 72.1

cinématique à 100°C mesurée selon kinematic at 100 ° C measured according to

la norme ASTM D-556 = 4 mm2/s) ASTM D-556 = 4 mm 2 / s)

Huile de base Gr III (viscosité 10,8 10,8  Gr III base oil (viscosity 10.8 10.8

cinématique à 100°C mesurée selon kinematic at 100 ° C measured according to

la norme ASTM D-556 = 8 mm2/s) ASTM D-556 = 8 mm 2 / s)

Améliorant de l'indice de viscosité 5,7 5,7  Viscosity index improver 5.7 5.7

(polymethacrylate) (Polymethacrylate)

Additif abaisseur de point 0,2 0,2  Additive reducing point 0.2 0,2

d'écoulement (polymethacrylate) flow (polymethacrylate)

Modificateur de frottement 0,8 0,8 (composé organomolybdène) 0.8 0.8 friction modifier (organomolybdenum compound)

Paquet d'additifs comprenant un 10,4 10,4  Package of additives comprising a 10.4 10.4

dispersant de type succinimide, un  succinimide dispersant, a

détergent de type sulfonate de  sulfonate detergent

calcium, un détergent de type  calcium, a type of detergent

carbonate de calcium  calcium carbonate

Alcool laurylique5 1 Lauryl alcohol 5 1

Tableau 6  Table 6

5 1 -dodecanol commercialisé par la société Sigma Aldrich 5 -Dodecanol marketed by Sigma Aldrich

Les performances en propreté moteur sur les compositions lubrifiantes CI9 et CC2 sont évaluées selon la méthode séquence IIIG en suivant la norme ASTM D7320 dans les conditions de tests suivantes : The engine clean performance on the lubricant compositions CI9 and CC2 are evaluated according to the IIIG sequence method according to the ASTM D7320 standard under the following test conditions:

Figure imgf000017_0001
Figure imgf000017_0001

Après cet essai, les pièces moteurs ont été analysées et cotées de la manière décrite dans la procédure publiée dans l'ASTM D7320. Les résultats de ce test sont donnés dans le tableau 7 respectivement pour les compositions CI9 et CC2. Plus la valeur du mérite est élevée, meilleure est la performance de la composition lubrifiante pour améliorer la propreté. After this test, the engine parts were analyzed and rated as described in the procedure published in ASTM D7320. The results of this test are given in Table 7 respectively for compositions CI9 and CC2. The higher the merit value, the better the performance of the lubricant composition to improve cleanliness.

Figure imgf000018_0001
Figure imgf000018_0001

Les résultats montrent que l'utilisation d'un alcool selon l'invention dans une composition lubrifiante permet d'améliorer la propreté d'un moteur (composition lubrifiante CI9) par rapport à une composition lubrifiante de référence ne comprenant pas d'alcool selon l'invention (composition lubrifiante CC2). Exemple 5 : Etude des propriétés à froid  The results show that the use of an alcohol according to the invention in a lubricant composition makes it possible to improve the cleanliness of an engine (lubricating composition CI9) with respect to a reference lubricating composition comprising no alcohol according to the invention. invention (lubricating composition CC2). Example 5: Study of cold properties

Les compositions du tableau 8 ont été testées pour leurs propriétés à froid : The compositions of Table 8 were tested for their cold properties:

Figure imgf000018_0002
Figure imgf000018_0002

Tableau 8  Table 8

6ISOFOL C12® alcool de formule (la) en C12.  6ISOFOL C12® alcohol of formula (Ia) in C12.

Les résultats obtenus sont mentionnés dans le tableau 9. Normes CC3 CI10 cm CI12The results obtained are shown in Table 9. Standards CC3 CI10 cm CI12

KV40 KV40

ISO 3104 93,67 90,92 88,91 85,04 (mm2. s"1) ISO 3104 93.67 90.92 88.91 85.04 (mm 2. S "1)

KV100  KV100

ISO3104 14,18 13,94 13,7 13,26 (mm2. s"1) ISO3104 14.18 13.94 13.7 13.26 (mm 2 s -1 )

VI ISO2909 156 157 157 157 VI ISO2909 156 157 157 157

CCS à -35°C ASTM CCS at -35 ° C ASTM

5390 5280 5150 4930 (mPa.s) D5293  5390 5280 5150 4930 (mPa.s) D5293

ASTM ASTM

MRV (cP) 24060 22630 21580 20460 MRV (cP) 24060 22630 21580 20460

D4684  D4684

fableau 9  fableau 9

Spécifiquement dans le test MRV (Mini Rotary Viscometer), la viscosité des compositions selon l'invention est moins élevée que pour la composition comparative. Ce test MRV permet de simuler les conditions de lubrification du moteur lors du démarrage à froid et notamment la pompabilité du lubrifiant lors du démarrage à froid. Dès lors, les compositions selon l'invention ont une meilleure pompabilité à froid que les compositions ne comprenant pas d'alcool gras.  Specifically in the Mini Rotary Viscometer (MRV) test, the viscosity of the compositions according to the invention is lower than for the comparative composition. This MRV test makes it possible to simulate the conditions of lubrication of the engine during the cold start and in particular the pumpability of the lubricant during the cold start. Therefore, the compositions according to the invention have better cold pumpability than the compositions that do not comprise fatty alcohol.

Spécifiquement également dans le test CCS (Cold Cranking Simulator) des compositions selon l'invention est moins élevé que pour la composition comparative. Ce test CCS permet de simuler les conditions de lubrification du moteur lors du démarrage à froid et notamment que la fluidité du lubrifiant à froid permettant le démarrage du moteur. Dès lors, les compositions selon l'invention ont une meilleure fluidité à froid que les compositions ne comprenant pas d'alcool gras. Ces résultats montrent que les alcools ramifiés selon l'invention permettent une amélioration des propriétés à froid du lubrifiant.  Specifically also in the CCS (Cold Cranking Simulator) test compositions according to the invention is lower than for the comparative composition. This CCS test makes it possible to simulate the conditions of lubrication of the engine during the cold start and in particular that the fluidity of the cold lubricant allowing the starting of the engine. Therefore, the compositions according to the invention have a better cold flowability than compositions comprising no fatty alcohol. These results show that the branched alcohols according to the invention allow an improvement in the cold properties of the lubricant.

Claims

REVENDICATIONS 1 . Utilisation d'un alcool de formule (I) CLAIMS 1. Use of an alcohol of formula (I) R-OH (I)  R-OH (I) dans laquelle R représente un groupement alkyl linéaire ou ramifié, saturé, comprenant de 10 à 36 atomes de carbone, in which R represents a saturated linear or branched alkyl group comprising from 10 to 36 carbon atoms, dans une composition lubrifiante pour améliorer la propreté d'un moteur de véhicule 4- temps. in a lubricating composition to improve the cleanliness of a 4-stroke vehicle engine. 2. Utilisation selon la revendication 1 pour laquelle l'alcool est choisi parmi les composés de formule (I) 2. Use according to claim 1 for which the alcohol is chosen from compounds of formula (I) dans laquelle R représente un groupement alkyl linéaire ou ramifié, saturé comprenant de 12 à 36 atomes de carbone. in which R represents a saturated linear or branched alkyl group comprising from 12 to 36 carbon atoms. 3. Utilisation selon l'une quelconque des revendications précédentes dans laquelle l'alcool est choisi parmi les composés de formule (la) 3. Use according to any preceding claim wherein the alcohol is selected from the compounds of formula (la) R1-C(R2)(H)-CH2-OH (la) R 1 -C (R 2 ) (H) -CH 2 -OH (la) dans laquelle R1 et R2 sont des alkyls linéaires ou ramifiés saturés choisis de façon à ce que le composé de formule (la) comprennent de 10 à 36 atomes de carbone, de préférence de 12 à 36 atomes de carbone. wherein R 1 and R 2 are linear or branched saturated alkyls selected so that the compound of formula (Ia) comprises from 10 to 36 carbon atoms, preferably from 12 to 36 carbon atoms. 4. Utilisation selon l'une quelconque des revendications précédentes pour laquelle la composition lubrifiante comprend au moins une huile de base. 4. Use according to any one of the preceding claims wherein the lubricating composition comprises at least one base oil. 5. Utilisation selon l'une quelconque des revendications précédentes pour laquelle la composition lubrifiante comprend de 0,1 à 10%, en poids, préférentiellement de 0,1 à 4% en poids, plus préférentiellement de 0,2 à 3% en poids, avantageusement de 0,3 à 2,5% en poids d'alcool par rapport au poids total de la composition lubrifiante. 5. Use according to any preceding claim wherein the lubricating composition comprises from 0.1 to 10% by weight, preferably from 0.1 to 4% by weight, more preferably from 0.2 to 3% by weight. preferably from 0.3 to 2.5% by weight of alcohol relative to the total weight of the lubricating composition. 6. Procédé d'amélioration de la propreté d'un moteur de véhicule 4-temps comprenant la lubrification du moteur par une composition lubrifiante telle que définie dans l'une quelconque des revendications 1 à 5. A method of improving the cleanliness of a 4-stroke vehicle engine comprising lubricating the engine with a lubricant composition as defined in any one of claims 1 to 5.
PCT/EP2018/062553 2017-05-15 2018-05-15 Use of lubricating compositions to improve the performance of a 4-stroke vehicle engine Ceased WO2018210829A1 (en)

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FR3145361A1 (en) * 2023-01-27 2024-08-02 Totalenergies Onetech Use of a lubricating composition comprising at least one base oil and at least one fatty alcohol

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