lubricant composition based on fatty triamines

Technical area

The present invention is applicable to the field of lubricants, such as engine lubricants, more particularly for motor vehicle engine. More particularly, the present invention relates to a lubricating composition comprising at least one base oil, at least one organomolybdenum compound, at least one compound comprising a dithiophosphate moiety and at least one fatty triamine. The lubricating composition according to the invention has both good friction properties for steel / steel contact, for contact steel / carbon coating and for coating carbon contact / carbon coating while maintaining good anti-wear properties .

The present invention also relates to a lubrication method using this composition.

The present invention also relates to a method for reducing friction between two steel surfaces, particularly in an engine, and more particularly in a motor vehicle engine.

The present invention also relates to a method for reducing friction between a steel surface and a surface coated with carbon, in particular in a motor, and more particularly in a motor vehicle engine.

The present invention also relates to a method for reducing friction between two carbon coated surfaces, more particularly in a motor vehicle engine.

The present invention also relates to a method for reducing the fuel consumption of a vehicle, and more particularly of a motor vehicle.

The present invention also relates to the use of a fatty triamine in a lubricating composition for reducing friction between two steel surfaces, particularly in an engine, and more particularly in a motor vehicle engine.

The present invention also relates to the use of a fatty triamine in a lubricating composition for reducing friction between a steel surface and a surface coated with carbon, in particular in a motor, and more particularly in a motor vehicle engine.

The present invention also relates to the use of a fatty triamine in a lubricating composition for reducing friction between two carbon coated surfaces, particularly in an engine, and more particularly in a motor vehicle engine.

The present invention also relates to the use of a fatty triamine in a lubricating composition for reducing the fuel consumption of a vehicle, and more particularly of a motor vehicle.

The present invention also relates to a composition type of additive concentrate comprising at least one organomolybdenum compound, at least one compound comprising a dithiophosphate moiety and at least one fatty triamine.

Technological background

The lubricants are designed to reduce friction and wear phenomena of mechanical parts, especially in vehicle engines, especially of motor vehicles.

To reduce these friction phenomena, it is known to incorporate friction modifiers in lubricants.

Among friction modifiers, the organomolybdenum compounds are a family of compounds, the phenomena of friction reducing properties have been widely described, and more particularly in contact between two steel surfaces.

However, it is known to those skilled in the art that the use of organomolybdenum compounds, including organomolybdenum compounds comprising a dithiocarbamate group, may cause a worsening of phenomena of wear of mechanical parts.

So, to solve this problem, the combination of an organomolybdenum compound and an anti-wear such as a compound comprising a dithiophosphate moiety in a lubricant composition has been widely described.

Document US 5650381 describes in particular a lubricating composition comprising an organomolybdenum compound and zinc dithiophosphate.

Furthermore, it is known to apply a coating on parts, including metal parts, to increase their wear resistance in condition to put under intensive and repeated friction. Among the existing technologies, it is known carbon coatings, including coatings DLC (Diamond Like Carbon) based on an amorphous carbon material with properties similar to those of diamond.

Thus, DLC coatings are used as coatings workpiece surfaces in vehicle engines, particularly in motor vehicle engines.

However, it is also known that the reduction properties of the friction phenomena of a carbon coating, and in particular a DLC coating, can be altered or degraded in the presence of a lubricant.

More particularly, it has been observed that the organomolybdenum compounds present in a lubricant may deteriorate or peel off a carbon coating on a surface and that this degradation can be accentuated with increasing the content of organomolybdenum compounds in the lubricant.

Thus, it has been sought lubricants compatible with surfaces coated with a carbon material, and in particular a DLC coating or nanodiamond coating, these lubricants not comprising organolmolybdène compounds. For example, EP 2479247 describes a lubricant comprising a compound based on a zinc phosphate compound and a sulfur compound.

Furthermore, EP 1338641 describes a lubricant comprising an amine as a friction modifier compatible with a surface having a DLC coating.

However, this document gives no teaching as to the phenomena of friction reducing properties of these lubricants for steel / steel contact.

In addition, this document provides no teaching as to the anti-wear properties of these lubricants, whether for steel / steel contact or steel / carbon coating.

The use of carbon in the coating engines, especially of motor vehicles is increasing, there is therefore still a need to find lubricants which have both good friction properties for steel / steel contact, for steel / carbon coating contacts and for coating carbon / carbon coating contacts, while retaining good anti-wear properties.

An object of the present invention is to provide a lubricating composition that overcomes all or in part the aforesaid drawbacks.

Another object of the invention is to provide a lubricating composition whose formulation is easy to implement.

Another object of the present invention is to provide a lubrication method for reducing friction between two steel surfaces, between a steel surface and a carbon coated surface and between two surfaces covered with carbon.

Summary of the Invention

The invention thus relates to a lubricating composition comprising:

- At least a base oil,

- At least one organomolybdenum compound

- At least one compound comprising a dithiophosphate group, and

- At least one fatty triamine.

Surprisingly, the Applicant has found that the presence of at least one organomolybdenum compound, at least one compound comprising a dithiophosphate moiety and at least one fatty triamine in a lubricating composition serves to confer on the lubricating composition simultaneously good properties of friction for steel / steel contacts for steel / carbon coating and contacts for coating carbon / carbon coating contacts.

Thus, the present invention allows the formulation of lubricating compositions comprising an optimized content of organomolybdenum compounds and having good properties of friction for the steel / steel contact, for the steel / coating contact carbon as well as for the contacts carbon coating / carbon coating.

Advantageously, the lubricating compositions according to the invention have good properties of friction for the steel / steel contact, for contact steel / carbon coating and the carbon coating contacts / carbon coating while maintaining good anti-wear properties.

Advantageously, the lubricating compositions of the invention can save fuel in all operating phases of a motor

vehicle, preferably of motor vehicles, and more particularly at startup.

Advantageously, the lubricating compositions according to the invention exhibit good storage stability and a viscosity that does not vary or very little.

In one embodiment of the invention, the lubricating composition consists essentially of:

- At least a base oil,

- At least one organomolybdenum compound

- At least one compound comprising a dithiophosphate group, and

- At least one fatty triamine.

The invention also relates to an engine oil comprising a lubricating composition as defined above.

The invention also relates to the use of a lubricating composition as defined above for the lubrication of mechanical components, particularly in the transmissions and / or vehicle engines, preferably for motor vehicles.

The invention also relates to the use of a lubricating composition as defined above to reduce friction between two steel surfaces, particularly in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a lubricant composition above to reduce friction between a steel surface and a surface coated with carbon, in particular in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a lubricating composition as defined above to reduce friction between two carbon coated surfaces, in particular in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a lubricating composition as defined above to reduce vehicle fuel consumption, preferably motor vehicles.

The invention also relates to a method of lubricating mechanical parts, in particular in transmission and / or vehicle engines, preferably for motor vehicles, comprising at least one step of contacting at least a part with a lubricating composition as defined above.

The invention also relates to a method for reducing friction between two steel surfaces, particularly in a motor vehicle, preferably a motor vehicle, comprising at least one step of contacting at least one of steel surfaces with a composition lubricating as defined above.

The invention also relates to a method for reducing friction between a steel surface and a surface coated with carbon, in particular in a motor vehicle, preferably a motor vehicle, comprising at least one step of contacting at least one of surfaces with a lubricating composition as defined above.

The invention also relates to a method for reducing friction between two carbon coated surfaces, in particular in a vehicle engine, preferably a motor vehicle, comprising at least one step of contacting at least one of the carbon surfaces covered with a lubricating composition as defined above.

The invention also relates to a method for reducing fuel consumption of a vehicle, preferably a motor vehicle, comprising at least one contacting step of a mechanical part of the vehicle engine with a lubricating composition as defined above.

The invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate moiety to reduce friction between two steel surfaces, including in a vehicle engine, preferably a motor vehicle.

The invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate moiety to reduce friction between a steel surface and a surface covered with carbon, in particular in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate moiety to reduce friction between two surfaces coated atoms, in particular in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate moiety to reduce the fuel consumption of a vehicle, preferably of a motor vehicle.

The invention also relates to a type of additive concentrate composition comprising:

- At least one organomolybdenum compound

- At least one compound comprising a dithiophosphate group, and

- At least one fatty triamine.

Detailed Description of the invention

The percentages given below are percentages by weight of active material.

composed organomolybdenum

The lubricating composition according to the invention comprises at least one organomolybdenum compound.

By organomolybdenum compound of the invention, means any compound organomolybdenum soluble in oil.

In one embodiment of the invention, the organomolybdenum compound may be selected from organic molybdenum complexes such as carboxylates, esters, molybdenum amides, obtainable by reacting molybdenum trioxide or molybdate of ammonium with fats, glycerides, fatty acids or fatty acid derivatives (esters, amines, amides, ...).

In a preferred embodiment of the invention, the organomolybdenum compound is selected from molybdenum complexes free of sulfur and phosphorus, with amide ligands, mainly prepared by reacting a molybdenum source, which may be by example molybdenum trioxide, and a amine derivatives, and fatty acids having for example 4 to 28 carbon atoms, preferably from 8 to 18 carbon atoms, such as, for example, fatty acids in vegetable or animal oils.

The synthesis of such compounds is described for example in US Patent 4889647, EP 0546357, US 5412130, EP 1770153.

In a preferred embodiment of the invention, the organomolybdenum compound is selected from organic molybdenum complexes prepared by reacting:

(I) a type of fat mono-, di- or tri glycerides or fatty acid,

A source amine of formula (A):

In which :

- X 1 represents an oxygen atom or a nitrogen atom,

- X 2 represents an oxygen atom or a nitrogen atom,

- N and m represent 1 when X 1 or X 2 represent an oxygen atom,

- N and m represents 2 when X 1 or X 2 represent a nitrogen atom,

(Iii) a molybdenum source selected from molybdenum trioxide or molybdate, preferably ammonium molybdate, in an amount sufficient to provide 0.1 to 30% molybdenum based on the total weight of complex.

In one embodiment of the invention, the organic molybdenum complex may comprise from 2 to 8.5% molybdenum by weight relative to the weight of complex.

In a preferred embodiment of the invention, the organic molybdenum complex is composed of at least one of the compounds of formula (I) or (II), alone or in admixture:

(I)

in which :

• X 1 represents an oxygen atom or a nitrogen atom;

• X 2 represents an oxygen atom or a nitrogen atom;

• n represents 1 when X 1 represents an oxygen atom and m represents 1 when X 2 represents an oxygen atom;

• n is 2 when X 1 represents a nitrogen atom and m represents 2 when X 2 represents a nitrogen atom;

• R represents a linear or branched alkyl group, saturated or unsaturated, containing 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, preferably from 7 to 17 carbon atoms;

• X 1 represents an oxygen atom or a nitrogen atom;

• X 2 represents an oxygen atom or a nitrogen atom;

• n represents 1 when X 1 represents an oxygen atom and m represents 1 when X 2 represents an oxygen atom;

• n is 2 when X 1 represents a nitrogen atom and m represents 2 when X 2 represents a nitrogen atom;

• R represents a linear or branched alkyl group, saturated or unsaturated, containing 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, preferably from 7 to 17 carbon atoms;

• R 2 represents a linear or branched alkyl group, saturated or unsaturated, containing 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, preferably from 7 to 17 carbon atoms.

In one embodiment of the invention, the organic molybdenum complex is prepared by reacting:

(I) a type of fat mono-, di- or tri glycerides or fatty acid,

(ii) de diéthanolamine ou de 2-(2-aminoethyl) aminoethanol,

(Iii) a molybdenum source selected from molybdenum trioxide or molybdate, preferably ammonium molybdate, in an amount sufficient to provide 0.1 to 20.0% of molybdenum relative to the complex weight.

In a preferred embodiment of the invention, the organic molybdenum complex is composed of at least one compound of formula (Ia) or (I la), alone or in admixture:

(the)

wherein Ri represents a linear or branched alkyl group, saturated or unsaturated, containing 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, preferably from 7 to 17 carbon atoms,

wherein Ri represents a linear or branched alkyl group, saturated or unsaturated, containing 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, preferably from 7 to 17 carbon atoms.

In another embodiment, the organomolybdenum compound may be selected from dithiophosphates of molybdenum or molybdenum dithiocarbamates.

In a preferred embodiment of the invention, the organomolybdenum compound is selected from molybdenum dithiocarbamates.

Dithiocarbamate compounds of molybdenum (Mo-DTC compounds) are complexes formed of a metal core bonded to one or more ligands, the ligand being a group alkyl dithiocarbamate. These compounds are well known to those skilled in the art.

In one embodiment of the invention, the Mo-DTC compound may comprise from 1 to 40%, preferably from 2 to 30%, more preferably from 3 to 28%, preferably 4 to 15% by mass of molybdenum, relative to the total mass of the Mo-DTC compound.

In another embodiment of the invention, the Mo-DTC compound may comprise from 1 to 40%, preferably from 2 to 30%, more preferably from 3 to 28%, preferably 4 to 15% by weight sulfur , relative to the total mass of the Mo-DTC compound.

In another embodiment of the invention, the Mo-DTC compound may be selected from those which the core has two molybdenum atoms (also known as Mo-DTC dimeric) and those of which the core has three molybdenum atoms (also called Mo-DTC trimeric).

In another embodiment of the invention, the Mo-DTC trimeric compounds correspond to the formula Mo 3 S k L n wherein:

- K is an integer at least equal to 4, preferably from 4 to 10, preferably 4 to 7,

- N is an integer ranging from 1 to 4, and

- L being a group comprising alkyl dithiocarbamate of 1 to 100 carbon atoms, preferably 1 to 40 carbon atoms, preferably 3 to

20 carbon atoms.

Examples of Mo-DTC trimeric compounds according to the invention include compounds and their methods of preparation as described in WO 98/26030 and US 2003/022954.

In a preferred embodiment of the invention, the Mo-DTC compound is a dimeric compound Mo-DTC.

Examples of Mo-DTC dimeric compounds include compounds and their methods of preparation as described in EP 0757093, EP 0719851, EP 0743354 or EP 1013749.

Mo-DTC compounds dimeric generally correspond to the compounds of formula (III):

R 3 , R 4 , R 5 , R 6 , identical or different, represent independently a hydrocarbon group selected from alkyl, alkenyl, aryl, cycloalkyl or cycloalkenyl,

X 3 , X 4 , X 5 and X 6 , identical or different, independently represent an oxygen atom or a sulfur atom.

By alkyl group within the meaning of the invention, is meant a hydrocarbon group, linear or branched, saturated or unsaturated, comprising from 1 to 24 carbon atoms.

In one embodiment of the invention, the alkyl group is selected from the group consisting of methyl, ethyl, propyl, isopropyl, n-butyl, iso-butyl, tert-butyl, n-pentyl, iso-pentyl, neopentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, isotridecyl the, tetradecyl, the hexadecyl, stearyl, the icosyl, docosyl, tetracosyl, triacontyl, 2-ethylhexyl, 2-butyloctyl, 2-butyldécyle, 2-hexyloctyle, 2-hexyldecyl, 2-octyldecyl, 2-hexyldodécyle , 2-octyldodecyl, 2-decyltetradecyl, 2-dodécylhexadécyle, 2-hexadécyloctadécyle, 2-tetradécyloctadécyle, myristyl, palmityl and stearyl.

Per alkenyl group within the meaning of the present invention, is meant a linear or branched hydrocarbon group comprising at least one double bond and having 2 to 24 carbon atoms. The alkenyl moiety may be selected from vinyl, allyl, propenyl, butenyl, isobutenyl, pentenyl, isopentenyl, hexenyl, heptenyl, octenyl, the nonenyl, decenyl, the 'undecenyl, the dodecenyl, the tetradecenyl and oleyl.

An aryl group as defined in the present invention refers to a polycyclic aromatic hydrocarbon or an aromatic group, unsubstituted or substituted with an alkyl group. The aryl group can comprise 6 to 24 carbon atoms. In one embodiment, the aryl group may be selected from the group consisting of phenyl, toluyl, xylyl, cumenyl, mesityl, benzyl, phenethyl, styryl, cinnamyl, benzhydryl, trityl, ethylphenyl, propylphenyl, butylphenyl, the pentylphenyl hexylphenyl, the heptylphenyl, the octylphenyl, nonylphenyl, decylphenyl the the undecylphenyl, dodecylphenyl, phenylphenyl the the benzylphenyl, phenyl styrene, p-cumylphenyl and naphthyl.

Within the meaning of the present invention, cycloalkyl groups and cycloalkenyl groups may be selected, without limitation, from the group consisting of cyclopentyl, cyclohexyl, cycloheptyl, methylcyclopentyl, methylcyclohexyl, the methylcycloheptyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, the methylcyclopentenyl, methylcyclohexenyl the. Cycloalkyl and cycloalkenyl groups may include 3 to 24 carbon atoms.

In a preferred embodiment of the invention, R 3 , R 4 , R 5 and R 6 , identical or different, independently represent an alkyl group comprising from 4 to

18 carbon atoms or an alkenyl group comprising from 2 to 24 carbon atoms.

In one embodiment of the invention, X 3 , X 4, X 5 and X 6 may be identical and may represent a sulfur atom.

In another embodiment of the invention, X 3 , X 4 , X 5 and X 6 may be identical and may be an oxygen atom.

In another embodiment of the invention, X 3 and X 4 may represent a sulfur atom and X 5 and X 6 may represent an oxygen atom.

In another embodiment of the invention, X 3 and X 4 may represent an oxygen atom and X 5 and X 6 may represent a sulfur atom.

In another embodiment of the invention; the ratio in number of atoms of sulfur relative to the number of oxygen atoms (N / A) Mo-DTC compound can range from (1/3) to (3/1).

In another embodiment of the invention, the Mo-DTC compound of formula (A) may be selected from a Mo-DTC symmetrical compound, an asymmetric Mo-DTC compound and their combination.

Compound by Mo-DTC symmetrical according to the invention is meant a Mo-DTC compound of formula (III) wherein the groups R 3 , R 4 , R 5 and R 6 are identical.

Compound by asymmetric Mo-DTC according to the invention is meant a Mo-DTC compound of formula (III) wherein the groups R 3 and R 4 are identical, the groups R 5 and R 6 are identical and the groups R 3 and R 4 are different from the groups R 5 and R 6 .

In a preferred embodiment of the invention, the Mo-DTC compound is a mixture of at least one Mo-DTC symmetrical compound and at least one asymmetric Mo-DTC compound.

In one embodiment of the invention, R 3 and R 4 are identical and represent an alkyl group comprising from 5 to 15 carbon atoms and R 5 and R 6 , identical or different R 3 and R 4 , represent a group alkyl comprising from 5 to 15 carbon atoms.

In a preferred embodiment of the invention, R 3 and R 4 are identical and represent an alkyl group comprising from 6 to 10 carbon atoms and R 5 and R 6 represent an alkyl group comprising from 10 to 15 carbon atoms.

In another preferred embodiment of the invention, R 3 and R 4 are identical and represent an alkyl group comprising from 10 to 15 carbon atoms and R 5 and R 6 represent an alkyl group comprising from 6 to 10 carbon atoms .

In another preferred embodiment of the invention, R 3 , R 4 , R 5 and R 6 , identical, represent an alkyl group comprising from 5 to 15 carbon atoms, preferably 8 to 13 carbon atoms.

Advantageously, the Mo-DTC compound is selected from compounds of formula (III) wherein:

- X 3 and X 4 represent an oxygen atom,

- X 5 and X 6 represent a sulfur atom,

- R 3 represents an alkyl group containing 8 carbon atoms or an alkyl group containing 13 carbon atoms,

- R 4 represents an alkyl group containing 8 carbon atoms or an alkyl group containing 13 carbon atoms,

- R 5 represents an alkyl group containing 8 carbon atoms or an alkyl group containing 13 carbon atoms,

- R 6 represents an alkyl group containing 8 carbon atoms or an alkyl group containing 13 carbon atoms.

Thus, advantageously, the Mo-DTC compound is selected from compounds of formula (III-a)

F¾ S ^N_a) S R6

wherein the groups R 3 , R 4 , R 5 and R 6 are as defined for formula (III).

More advantageously, Mo-DTC compound is a mixture of:

- A Mo-DTC compound of formula (III-a) wherein R 3 , R 4 , R 5 and R 6 represent an alkyl group comprising 8 carbon atoms,

- A Mo-DTC compound of formula (III-a) wherein R 3 , R 4 , R 5 and R 6 represent an alkyl group containing 13 carbon atoms, and

- A Mo-DTC compound of formula (III-a) wherein R 3 , R 4 represent an alkyl group containing 13 carbon atoms and R 5 and R 6 represent an alkyl group comprising 8 carbon atoms, and / or

- A Mo-DTC compound of formula (A1) wherein R 3 , R 4 represent an alkyl group comprising 8 carbon atoms and R 5 and R 6 represent an alkyl group containing 13 carbon atoms.

Examples of Mo-DTC compounds include the Molyvan products L, Molyvan 807 or Molyvan 822 sold by RT Vanderbilt Compagny or Sakura-Lube 200 products Sakura-Lube 165, Sakura-Lube 525 or Sakura-Lube 600 marketed by Adeka company.

In one embodiment of the invention, the weight content of organomolybdenum compound is from 0.05 to 3%, preferably 0.1 to 2%, preferably 0.1 to 1% based on the total weight of the lubricating composition.

Compound comprising a dithiophosphate moiety

The lubricating composition according to the invention comprises at least one compound comprising a dithiophosphate moiety.

For simplification of the description, the compound comprising a dithiophosphate group is called "dithiophosphate" later in this description.

Dithiophosphate, without limitation, may be selected from ammonium dithiophosphates, amine dithiophosphates, dithiophosphates ester and metal dithiophosphates, taken alone or in mixture.

In one embodiment of the invention, the dithiophosphate is selected from ammonium dithiophosphates of formula (IV):

wherein R 7 and R 8 independently of one another a hydrocarbon group, optionally substituted, comprising 1 to 30 carbon atoms.

In a preferred embodiment of the invention, R 7 and R 8 independently of one another a hydrocarbon group, optionally substituted, comprising from 2 to 24 carbon atoms, more preferably from 3 to 18 carbon atoms , preferably from 5 to 12 carbon atoms.

In another preferred embodiment of the invention, R 7 and R 8 independently of one another a hydrocarbon group, unsubstituted, said hydrocarbon group may be an alkyl, alkenyl, alkynyl, phenyl or benzyl.

In another preferred embodiment of the invention, R 7 and R 8 independently of one another a linear alkyl or branched hydrocarbon group, more preferably a linear hydrocarbon alkyl.

In another preferred embodiment of the invention, R 7 and R 8 independently of one another a hydrocarbon group optionally substituted by at least one oxygen, nitrogen, sulfur and / or phosphorus, preferably by at least one oxygen atom.

Examples of ammonium dithiophosphate, dimethyl dithiophosphates include ammonium, ammonium diethyl dithiophosphate and dibutyl ammonium dithiophosphates.

In another embodiment of the invention, the dithiophosphate is selected from amine dithiophosphates eneral formula V):

in which :

- R 9 and R-io are independently of one another a hydrocarbon group, optionally substituted, comprising 1 to 30 carbon atoms,

- Ru, R 12 and R 13 independently of one another a hydrogen atom or a hydrocarbon group of 1 to 30 carbon atoms, provided that at least one of Ru, R 12 and R 13 does not represent a hydrogen atom.

In a preferred embodiment of the invention, R 9 and R 10 independently of one another a hydrocarbon group, optionally substituted, comprising from 2 to 24 carbon atoms, more preferably from 3 to 18 carbon atoms , preferably from 5 to 12 carbon atoms.

In another preferred embodiment of the invention, R 9 and R 10 independently of one another a hydrocarbon group, unsubstituted, said hydrocarbon group may be an alkyl, alkenyl, alkynyl, phenyl or benzyl.

In another preferred embodiment of the invention, R 9 and R 10 independently of one another a linear or branched hydrocarbon group, more preferably a linear hydrocarbon alkyl.

In another preferred embodiment of the invention, R 9 and R 10 independently of one another a hydrocarbon group optionally substituted by at least one oxygen, nitrogen, sulfur and / or phosphorus, preferably by at least one oxygen atom.

In another preferred embodiment of the invention, Ru, R 12 and R 13 independently of one another a hydrocarbon group having from 2 to 24 carbon atoms, more preferably from 3 to 18 carbon atoms, preferably from 5 to 12 carbon atoms.

In another embodiment of the invention, the dithiophosphate is selected from dithiophosphates of the ester of general formula (VI):

in which :

- R-14 and R 15 independently of one another a hydrocarbon group, optionally substituted, comprising 1 to 30 carbon atoms,

- R-I6 and R 17 independently of one another a hydrocarbon group having 1 to 18 carbon atoms.

In a preferred embodiment of the invention, R 14 and R 15 independently of one another a hydrocarbon group, optionally substituted, comprising from 2 to 24 carbon atoms, more preferably from 3 to 18 carbon atoms , preferably from 5 to 12 carbon atoms.

In another preferred embodiment of the invention, R 14 and R 15 independently of one another a hydrocarbon group, unsubstituted, said hydrocarbon group may be an alkyl, alkenyl, alkynyl, phenyl or benzyl.

In another preferred embodiment of the invention, R 14 and R 15 independently of one another a linear or branched hydrocarbon group, more preferably a linear hydrocarbon alkyl.

In another preferred embodiment of the invention, R 14 and R 15 independently of one another a hydrocarbon group optionally substituted by at least one oxygen, nitrogen, sulfur and / or phosphorus, preferably by at least one oxygen atom.

In another preferred embodiment of the invention, R 14 and R 15 independently of one another, a hydrocarbon group comprising 2 to 6 carbon atoms.

In another preferred embodiment of the invention, R 16 and R 17 independently of one another a hydrocarbon group having 2 to 6 carbon atoms.

In another embodiment, the dithiophosphate is selected from metal dithiophosphates of general formula (VII):

in which :

- Ris and R independently of one another a hydrocarbon group, optionally substituted, comprising 1 to 30 carbon atoms,

- M represents a metal cation, and

- N is the valence of the metal cation.

In a preferred embodiment of the invention, the metal is selected from the group consisting of zinc, aluminum, copper, iron, mercury, silver, cadmium, tin, lead, antimony, bismuth, thallium, chromium, molybdenum, cobalt, nickel, tungsten, sodium, calcium, magnesium, manganese and arsenic. The preferred metals are zinc, molybdenum, antimony, preferably zinc and molybdenum. *

In a preferred embodiment of the invention, the metal is zinc.

metal mixtures can be used. The metal dithiophosphates are neutral as exemplified in formula (VII) or basic when a stoichiometric excess of metal present.

In a preferred embodiment of the invention, R 18 and R 19 independently of one another a hydrocarbon group, optionally substituted, comprising from 2 to 24 carbon atoms, more preferably from 3 to 18 carbon atoms , preferably from 5 to 12 carbon atoms.

In another preferred embodiment of the invention, R 18 and R 19 independently of one another a hydrocarbon group, unsubstituted, said hydrocarbon group may be an alkyl, alkenyl, alkynyl, phenyl or benzyl.

In another preferred embodiment of the invention, 18 and R 19 independently of one another a linear or branched hydrocarbon group, more preferably a linear hydrocarbon alkyl.

In another preferred embodiment of the invention, R 18 and R 19 independently of one another a hydrocarbon group optionally substituted by at least one oxygen, nitrogen, sulfur and / or phosphorus, preferably by at least one oxygen atom.

Advantageously, according to the invention the dithiophosphate is a zinc dithiophosphate of formula (VII-a) or formula (VII-b):

(Vll-a)

(Vll-b)

in which R 8 and R 19 are as defined above.

As metallic dithiophosphate according to the invention include eg Additin ® RC 3038, the Additin ® RC 3045, the Additin ® RC 3048, the Additin ® RC 3058, the Additin ® RC 3080 the Additin ® RC 3180, the Additin ® RC 3212, the Additin ® RC 3580, the Kikulube ® Z1 12, the Lubrizol ® 1371 Lubrizol ® 1375, Lubrizol ® 1395 Lubrizol ® 5179, the Oloa ® 260, the Oloa ® 267.

In one embodiment of the invention, the weight dithiophosphate content is from 0.1 to 5%, preferably from 0.1 to 3%, preferably 0.5 to 2% relative to the total weight of the lubricating composition.

Triamine grasse

The lubricating composition according to the invention comprises at least one fatty triamine.

The fatty triamines are mainly obtained from carboxylic acids. The starting fatty acids to obtain fatty triamines according to the invention may be chosen from myristic, pentadecylic, palmitic, margaric, stearic, nonadecyl, arachidic, heneicosanoic, behenic, tricosanoic, lignoceric, pentacosanoic, cerotic, heptacosanoïque, montanic, nonacosanoïque, melissic, hentriacontanoïque, lacéroïque or unsaturated fatty acids such as palmitoleic acid, oleic, erucic, nervonic, linoleic, a-linolenic, gamma-linolenic, dihomo-gamma-linolenic, arachidonic, eicosapentaenoic, docosahexaenoic.

Preferred fatty acids can be derived from the hydrolysis of triglycerides found in vegetable and animal oils, such as coconut, palm, olive, peanut, rapeseed, sunflower, soybean, cotton, flax, beef tallow, .... the natural oils may have been genetically modified to enhance their content of certain fatty acids. For example, mention may be made of rapeseed oil or high oleic sunflower oil.

In one embodiment of the invention, fatty triamines may be obtained from natural resources, plant or animal.

In another embodiment of the invention, the fatty triamine is selected from the compounds of formula (VIII):

R20-N-[(CH2)3-NH2]2

(WINE)

wherein R 20 represents a linear or branched alkyl group, saturated or unsaturated having at least 10 carbon atoms, preferably 10 to 22 carbon atoms, more preferably from 14 to 22 carbon atoms, preferably 16 to 20 carbon atoms .

In a preferred embodiment of the invention, R 20 represents a mixture of at least one saturated alkyl group containing 16 to 18 carbon atoms and a mono-unsaturated alkyl group comprising from 16 to 18 carbon atoms.

In another embodiment of the invention, the fatty triamine is selected from the compounds of formula (IX):

R2i-NH-(CH2-CH2-CH2-NH)2-H

(IX)

wherein R 2 i represents a linear or branched alkyl group, saturated or unsaturated having at least 10 carbon atoms, preferably 10 to 22 carbon atoms, more preferably from 14 to 22 carbon atoms, preferably 16 to 20 carbon carbon.

In one embodiment of the invention, the fatty triamine content by weight is from 0.1 to 5%, preferably from 0.1 to 3%, preferably 0.5 to 2% relative to the total weight of the composition.

In another embodiment of the invention, the lubricant composition comprises a weight ratio (compound organomolybdenum / fatty triamine) ranging from 1/10 to 1, preferably from 1/5 to 4/5.

In another embodiment of the invention, the lubricant composition comprises a weight ratio (compound organomolybdenum / compound comprising a dithiophosphate / fatty triamine moiety) of from 1/1/1 to 1/10/10, preferably from 1 / 5/5 4/5/5.

Base oil

The lubricant compositions of the invention can contain any type of mineral lubricating base oil, synthetic or natural, suitable animal or plant (s) to use.

Or the base oils used in lubricant compositions of the present invention can be mineral oils or synthetic origin of Groups I to V according to the classes defined in the API classification (or equivalent according to the classification EL ATI) as summarized below, alone or in mixture.

Tableau I

mineral base oils of the invention include all types of bases obtained by atmospheric and vacuum distillation of crude oil, followed by refining operations such as extraction solvent, désalphatage, solvent dewaxing, hydrotreating, hydrocracking and hydroisomerization, hydrofinishing.

base oils of lubricating compositions according to the invention may also be synthetic oils, such as certain carboxylic acid esters and alcohols, or polyalphaolefins. Polyalphaolefins used as base oils are for example obtained from monomers having from 4 to 32 carbon atoms (e.g., octene, decene), and a viscosity at 100 ° C of between 1, 5 and 15 cSt, according to standard ASTM D445. Their average molecular weight is typically between 250 and 3000 according to the ASTM D5296 standard. Mixtures of synthetic and mineral oils may also be employed. There is no limitation on the use of a particular lubricant base to realize the lubricant compositions according to the invention, except that they must have properties, including viscosity, viscosity index, content sulfur, oxidation resistance, suitable for use in a vehicle engine, preferably of motor vehicles.

In one embodiment of the invention, the base oil, at least 50% by weight, based on the total weight of the lubricating composition, preferably at least 60%, or even at least 70%. Typically, it is between 75 and 99.9% by weight, based on the total weight of the lubricating compositions according to the invention.

In a preferred embodiment of the invention, the lubricant compositions include mineral bases of Group I and / or III, or synthetic bases Group IV according to the API classification.

In another preferred embodiment of the invention, the lubricating compositions have a kinematic viscosity at 100 ° C measured according to ASTM D445 of from 4 to 25 cSt, preferably 5 to 22 cSt, preferably 5 to 13 cSt .

In another preferred embodiment of the invention, the lubricating compositions have a viscosity index (VI) greater than or equal to 140, preferably greater than or equal to 150, measured according to ASTM 2270 standard.

other additives

The lubricating compositions according to the invention may also contain in addition at least one additive selected from detergents, anti-wear different dithiophosphate additives, extreme pressure additives, dispersants, pour point improvers of, anti -mousse, thickeners and mixtures thereof.

In one embodiment, the lubricant composition may further comprise at least one antioxidant additive. Additives antioxidants retard the degradation of the lubricant compositions in use, including motor oils in service degradation which may in particular result in the formation of deposits, the presence of sludge, or a viscosity increase of the lubricating composition, in particular of engine oil. The additives including antioxidants act as free radical inhibitors or destructive hydroperoxides. Among the commonly used antioxidants include phenolic antioxidants type or the amine type, the phosphorosulphur antioxidants. Some of these antioxidants, for example phosphorosulphur may be ash generators. The phenolic antioxidants may be ashless or be in the form of neutral or basic metal salts.

The antioxidant agent may be chosen among hindered phenols, sterically hindered phenol esters and hindered phenols including a thioether bridge, diphenylamines, diphenylamines substituted by at least one alkyl group C1-C12, the Ν, Ν aryl dialkyl diamines, and combinations thereof. By hindered phenol is meant in the sense of the present invention a compound

comprising a phenol group in which at least one carbon vicinal carbon bearing the alcohol function is substituted by at least one C1 -C10 alkyl group, preferably a C1 -C6 alkyl group, preferably a C4 alkyl group, preferably by tert-butyl group. Amine compounds are another class of antioxidants that can be used, optionally in combination with phenolic antioxidants. Typical examples are aromatic amines of the formula R22R23R24N, wherein R22 represents an aliphatic group or an optionally substituted aromatic group, R23 represents an optionally substituted aromatic group, R 24 represents a hydrogen atom, an alkyl group, an aryl group or a group of the formula R25S (0) Z R 2 6, wherein R25 represents an alkylene group or an alkenylene group, R 2 6 represents an alkyl group, an alkenyl group or an aryl group and z represents an integer equal to 0, 1 or 2. alkyl sulfurized phenols or their alkali and alkaline earth metals salts may also be used as antioxidants. Another class of antioxidants is that of copper compounds, for examples thio- or dithiophosphates copper, copper salts and of carboxylic acids, dithiocarbamates, sulphonates, phenates, copper acetylacetonates. Copper salts I and II, succinic acid or anhydride may also be used.

The lubricating composition according to the invention can contain all types of antioxidant additives known to the skilled person. Advantageously, the antioxidants are ashless used.

In one embodiment, the lubricating composition according to the invention may comprise from 0.5 to 2% of at least one antioxidant additive by weight relative to the total weight of the lubricating composition.

In one embodiment, the lubricant composition of the invention may further comprise a detergent additive. The detergent additive especially reduce the formation of deposits on the surface of metal parts by dissolution of secondary oxidation and combustion products. The detergents used in the lubricating composition according to the invention are well known to those skilled in the art. Detergents commonly used in the formulation of lubricating compositions may be anionic compounds containing a long lipophilic hydrocarbon chain and a hydrophilic head. The associated cation is typically a metal cation of an alkali metal or alkaline earth metal. Detergents are preferably selected from alkali metal salts or alkaline earth metal carboxylic acids, sulfonates, salicylates, naphthenates, phenates and the salts. Alkali and alkaline earth metals are preferably calcium, magnesium, sodium or barium. These metal salts may contain metal approximately stoichiometric amount or in excess (in excess of the stoichiometric amount). In the latter case, these detergents are so called overbased detergents. The excess metal, bringing the character overbased detergent is in the form of insoluble metal salts in oil, for example carbonate, hydroxide, oxalate, acetate, glutamate, preferably carbonate. In one embodiment, the lubricant composition of the invention may comprise 2 to 4 wt% of detergent, based on the total weight of the lubricating composition.

In one embodiment, the lubricating composition according to the invention may further comprise at least one buck additive pour point. Depressants additives pour point especially improves cold behavior of lubricating compositions, slowing the formation of wax crystals. As examples of additives pour point depressants include alkyl polymethacrylates, polyacrylates, polyarylamides, the polyalkylphenols, of polyalkylnaphthalenes, alkylated polystyrenes.

In one embodiment, the lubricant composition of the invention may further comprise at least one dispersant. Dispersants may be selected from the groups consisting of or Mannich bases.

In one embodiment, the lubricating composition according to the invention may comprise from 0.2 to 10% by weight of dispersant relative to the total weight of the lubricating composition.

In one embodiment, the lubricant composition may further comprise at least one polymer viscosity index improver. Mention may be made among these polymers the ester polymers, ethylene propylene copolymers, homopolymers or copolymers of styrene, butadiene or isoprene, hydrogenated, polymethacrylates (PMA).

In one embodiment, the lubricating composition according to the invention may comprise 1 to 15% by weight of polymeric improving the viscosity index, relative to the total weight of the lubricating composition.

In one embodiment of the invention, the lubricating composition comprises: from 75 to 99.75% of at least a base oil,

from 0.05 to 3% of at least one organomolybdenum compound,

from 0.1 to 5% of at least one compound comprising a group dithiophosphate,

from 0.1 to 5% of at least one fatty triamine.

In another embodiment of the invention, the lubricating composition comprises:

from 75 to 99.25% of at least one base oil,

from 0.05 to 3% of at least one organomolybdenum compound,

from 0.1 to 5% of at least one compound comprising a group dithiophosphate,

from 0.1 to 5% of at least one fatty triamine,

from 0.5 to 5% of at least one other additive.

In another embodiment of the invention, the lubricating composition consists essentially of:

75 to 99.75% of at least a base oil,

0.05 to 3% of at least one organomolybdenum compound,

0.1 to 5% of at least one compound comprising a group dithiophosphate,

0.1 to 5% of at least one fatty triamine.

In another embodiment of the invention, the lubricating composition consists essentially of:

75 to 99.25% of at least a base oil,

0.05 to 3% of at least one organomolybdenum compound,

0.1 to 5% of at least one compound comprising a group dithiophosphate,

0.1 to 5% of at least one fatty triamine,

0.5 to 5% of at least one other additive.

All the features and preferences submitted for the base oil, the organomolybdenum compound, the compound comprising a group

dithiophosphate, the fatty triamine and the further additive is also applicable to lubricating compositions above.

In one embodiment of the invention, the lubricating composition is not an emulsion.

In another embodiment of the invention, the lubricating composition is anhydrous.

The invention also relates to an engine oil comprising a lubricant composition according to the invention.

All the features and preferences submitted to the lubricant composition also applies to the engine oil according to the invention.

In one embodiment of the invention, the engine oil can be grade OW-20 and 5W-30 according to SAEJ300 classification, characterized by a kinematic viscosity at 100 ° C (KV100) ranging from 5.6 to 12, 5 cSt measured according to ASTM D445 international standard.

In another embodiment of the invention, the engine oil can be characterized by a viscosity index calculated according to international standard ASTM D2230, greater than or equal to 130, preferably greater than or equal to 150.

To make an engine oil, it is advantageous to use base oils having a sulfur content less than 0.3% for example mineral oils of Group III, and synthetic sulfur-free bases, preferably group IV, or mixtures thereof .

The invention also relates to the use of a lubricating composition as defined above for the lubrication of mechanical components, particularly in the transmissions and / or vehicle engines, preferably for motor vehicles.

The invention also relates to the use of a lubricating composition as defined above to reduce friction between two steel surfaces, particularly in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a lubricant composition above to reduce friction between a steel surface and a surface coated with carbon, in particular in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a lubricating composition as defined above to reduce friction between two carbon coated surfaces, in particular in a motor vehicle, preferably a motor vehicle.

By carbon coating according to the invention means any coating containing carbon.

These carbon coatings may be selected from diamond coatings, and more particularly the nanodiamond coatings.

Such coatings may in particular be in the form of at least one nanocrystalline diamond layer, having a purity of 70 to 99%.

In one embodiment of the invention, the carbon coatings are selected from nanodiamond coatings in the form of at least one nanocrystalline diamond layer having a purity ranging from 70 to 99%, preferably from 70 to 97%, preferably 75% and a thickness of from 0.1 to 3μ, preferably from 0.5 to 2μ, preferably from 1, 5μ.

These carbon coatings can also be selected from DLC coatings (Diamond Like Carbon).

Any type of DLC coating can be used as carbon coating according to the invention.

The DLC are a group of families of amorphous materials containing mostly carbon.

Among these families, both families are mainly known and used: hydrogenated DLC, including hydrogenated DLC called aC: H and non-hydrogenated DLC, including non-hydrogenated DLC called aC or non-hydrogenated DLC called ta-C.

DLCs ​​have properties which vary according to their hybridized carbon sp3 content and hydrogen content. Some variants DLC may be doped with metal elements such as iron, chromium or tungsten.

Compared to diamond coatings, DLC coatings are generally less resistant mechanically and thermally because they are amorphous materials. By cons, they are usually less rough and above can be deposited at low temperature on most substrates.

In one embodiment of the invention, the DLC are selected from hydrogenated DLC, including hydrogenated DLC referred aC: H.

In a preferred embodiment of the invention, the DLC are selected from hydrogenated DLC, including hydrogenated DLC referred aC: H containing 10 to 40% hydrogen.

The above use also allows not to increase or to reduce the wear between two steel surfaces, particularly in a motor vehicle, preferably a motor vehicle.

The above use also allows not to increase or to reduce the wear between a steel surface and a surface coated with carbon, in particular in a motor vehicle, preferably a motor vehicle.

The above use also allows not to increase or to reduce the wear between two surfaces coated with carbon, in particular in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a lubricating composition as defined above to reduce vehicle fuel consumption, preferably of motor vehicle.

All of the characteristics and preferences presented for the lubricating composition is also applicable to the above uses.

The invention also relates to a method of lubricating mechanical parts, in particular in transmission and / or vehicle engines, preferably for motor vehicles, comprising at least one step of contacting at least a part with a lubricating composition as defined above.

The invention also relates to a method for reducing friction between two steel surfaces, particularly in a motor vehicle, preferably a motor vehicle, comprising at least one step of contacting at least one of steel surfaces with a lubricating composition as defined above.

The invention also provides a method for reducing friction between a steel surface and a carbon-coated surface, in particular in a motor vehicle, preferably a motor vehicle, comprising at least one step of contacting at least one of the surfaces with a lubricating composition as defined above.

The invention also relates to a method for reducing friction between two carbon coated surfaces, in particular in a motor vehicle, preferably a motor vehicle, comprising at least one step of contacting at least one surface coated with carbon with a lubricating composition as defined above.

The method above also allows not to increase or to reduce the wear between two steel surfaces, particularly in a motor vehicle, preferably a motor vehicle.

The method above also allows not to increase or to reduce the wear between a steel surface and a surface coated with carbon, in particular in a motor vehicle, preferably a motor vehicle.

The method above also allows not to increase or to reduce the wear between two carbon coated surfaces, in particular in a motor vehicle, preferably a motor vehicle.

The invention also provides a method for reducing fuel consumption of a vehicle, preferably a motor vehicle, comprising at least one contacting step of a mechanical part of the vehicle engine with a lubricating composition as defined above.

All of the characteristics and preferences presented for the lubricating composition is also applicable to the above methods.

The vehicles may include an internal combustion engine with two or four times.

The engines can be gasoline or diesel engines to be powered by gasoline or conventional diesel. By "conventional gasoline" or "classic diesel" refers to the sense of the present invention of engines that are powered by fuel obtained after refining of a mineral oil (such as oil, for example). The motors can also be petrol or diesel engines engines modified to be powered from an oil based fuel from renewable materials such as alcohol-based fuels or biodiesel fuel.

Vehicles may be light vehicles such as cars and motorcycles. Vehicles can also be trucks, construction machinery, ships.

The invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate moiety to reduce friction between two steel surfaces , particularly in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate moiety to reduce friction between a steel surface and a surface coated with carbon, in particular in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate moiety to reduce friction between two surfaces coated with carbon, in particular in a motor vehicle, preferably a motor vehicle.

The above use also allows not to increase or to reduce the wear between two steel surfaces, particularly in a motor vehicle, preferably a motor vehicle.

The above use also allows not to increase or to reduce the wear between a steel surface and a surface coated with carbon, in particular in a motor vehicle, preferably a motor vehicle.

The above use also allows not to increase or to reduce the wear between two surfaces coated with carbon, in particular in a motor vehicle, preferably a motor vehicle.

The invention also relates to the use of a fatty triamine in a lubricating composition comprising at least one base oil, at least one organomolybdenum compound and at least one compound comprising a dithiophosphate moiety to reduce the fuel consumption of a vehicle, preferably a motor vehicle.

All of the characteristics and preferences presented for the base oil, the fatty triamine, the organomolybdenum compound and the compound comprising a dithiophosphate group also applies to the above uses.

The invention also relates to a type of additive concentrate composition comprising:

- At least one organomolybdenum compound

- At least one compound comprising a dithiophosphate group, and

- At least one fatty triamine.

All the features and preferences submitted for oily triamine, organomolybdenum the compound and the compound comprising a group dithiophosphate also applies to the concentrated type of composition of the above additives.

In one embodiment of the invention, the concentrated type of additive composition further comprises at least one further additive.

The additional additive may be selected from the additives mentioned above.

In one embodiment of the invention, the concentrated type of additive composition of the invention may be added at least a base oil for a lubricating composition according to the invention.

The various objects of this invention and their implementation will be better understood from reading the following examples. These examples are indicative, without limiting.

Examples:

example 1

the lubricant compositions were prepared No. 1 to No. 6 from the following compounds:

- A Group III base oil having a viscosity at 100 ° C of 4.3 cSt measured according to ASTM D445,

- A compound comprising a group dithiophosphate: zinc dithiophosphate (Lz 1371 sold by Lubrizol),

- A compound organomolybdenum 1: complex organomolybdenum of formula (Ia) wherein R represents a hydrocarbon group comprising 1 1 carbon atoms (Molyvan 855 sold by the Vanderbilt company)

- A organomolybdenum compound 2: molybdenum dithiocarbamate (Sakura-Lube 525 marketed by Adeka company)

- A fatty triamine of formula (VIII) wherein R 20 represents

hydrocarbon group having from 16 to 18 carbon atoms (Triameen YT marketed by the AKZO company).

The lubricating compositions # 1 to # 6 are described in Table II; the percentages are percentages by weight.

Table II

Test 1: Evaluation of lubricating compositions frictional properties on a steel / steel Contact

These lubricating compositions devalue friction properties # 1, # 2 and # 4 of the steel / steel contact by measuring the friction coefficient.

The friction coefficient is estimated using a linear tribometer ball / plane under the following conditions:

- Type of steel: 100C6

- Temperature: 80 ° C

- Normal load of 5N,

- 5mm stroke.

A difference of at least 0.01 between two friction coefficient values ​​is considered significant to show the influence on said friction coefficient.

Table III shows the coefficient of friction of the lubricating compositions # 1, # 2 and # 4.

Table III

These results show that the lubricating composition according to the invention No. 4 provides improved frictional properties for the steel / steel contact, in relation to a lubricating composition comprising an organomolybdenum compound of the invention and a compound comprising a group according dithiophosphate invention but not including fatty triamine of the invention (composition No. 2).

In addition to these results for the coefficient of friction, it has been observed that by the use of the lubricating composition of the invention No. 4, the wear to the bead surface does not worsen, compared to the lubricating composition # 2.

Test 2: Evaluation of lubricating compositions friction properties of DLC Contact / steel

This is to evaluate the frictional properties of lubricating compositions # 1, # 2, # 4 and # 6 of the DLC / steel contact, by measuring the friction coefficient.

The friction coefficient is estimated using a linear tribometer ball DLC / steel shot under the following conditions:

- Type of steel: 100C6,

- Nature of the DLC-coated beads: hydrogenated DLC CH containing between 31 and 33% of hydrogen and having a molar ratio (carbon sp 2 / sp carbon 3 ) equal to 55/45, - thickness of the DLC layer: 1 , 5μ,

- Temperature 1 10 ° C,

- Normal load of 5N,

- 10mm stroke.

A difference of at least 0.01 between two friction coefficient values ​​is considered significant to show the influence on said friction coefficient.

Table IV gives the coefficient of friction of the lubricating compositions # 1, # 2, # 4 and # 6.

Table IV

These results show that the lubricating composition according to the invention No. 4 provides frictional properties improved on DLC / steel contact, compared to a lubricating composition comprising an organomolybdenum compound of the invention and a compound comprising a group dithiophosphate according to the invention but not comprising a fatty triamine of the invention (composition No. 2), as compared to a lubricating composition comprising a fatty triamine according to the invention but not comprising organomolybdenum compound of the invention or a compound comprising dithiophosphate group of the invention (composition No. 6).

It is interesting to note that the coefficients of friction of the lubricating compositions # 2 and # 6 are higher than the friction coefficient of the lubricant composition according to the invention No. 4, thus demonstrating a synergistic effect of the combination of an organomolybdenum compound of the invention, a compound comprising a group dithiophosphate according to the invention and of a fatty triamine according to the invention to reduce friction on the DLC / steel contact. In addition to these results for the coefficient of friction, it has been observed that by the use of the lubricating composition of the invention No. 4, the wear of the DLC coating of the beads was no increase compared to lubricating compositions # 2 and # 6.

Test 3: evaluation of lubricating compositions frictional properties on a DLC Contact / steel

This is to evaluate the frictional properties of lubricating compositions # 1, # 2 and # 4 of the DLC / steel contact, by measuring the friction coefficient.

The friction coefficient is measured using a tribometer ball HFFR DLC / steel shot under the following conditions:

- Type of steel: 100C6

- The nature of the DLC coating: hydrogenated DLC CH containing between 31 and 33% of hydrogen and having a molar ratio (carbon sp 2 / sp carbon 3 ) equal to 55/45,

- Thickness of the DLC layer: 1, 5μ,

- Temperature 1 10 ° C,

- Frequency: 20 Hz.

A difference of at least 0.01 between two friction coefficient values ​​is considered significant to show the influence on said friction coefficient.

Table V lists the coefficient of friction of the lubricating compositions # 1, # 2 and # 4.

Tableau V

These results confirm the results of test 2; indeed, they demonstrate that the lubricant composition according to the invention No. 4 provides improved frictional properties for the DLC / steel contact, in relation to a lubricating composition comprising an organomolybdenum compound of the invention and a compound comprising a dithiophosphate moiety according to the invention but not including fatty triamine of the invention (composition No. 2).

Test 4: Evaluation of lubricating compositions frictional properties on a DLC Contact / steel

This is to evaluate the frictional properties of lubricating compositions # 1, # 3 and # 5 of the DLC / steel contact, by measuring the friction coefficient.

The friction coefficient is evaluated by the method described in Test 3.

A difference of at least 0.01 between two friction coefficient values ​​is considered significant to show the influence on said friction coefficient.

Table VI shows the coefficient of friction of the lubricating compositions # 1, # 3 and # 5.

Table VI

These results confirm the results of test 2 and test 3; indeed, they demonstrate that the lubricant composition according to the invention No. 5 provides improved frictional properties for the DLC / steel contact, in relation to a lubricating composition comprising an organomolybdenum compound of the invention and a compound comprising a dithiophosphate moiety according to the invention but not comprising a fatty triamine of the invention (composition No. 3), this in the presence of a compound different from organomolybdenum 2 organomolybdenum compound 1.

example 2

the lubricant compositions were prepared No. 7 to No. 10 from the following compounds:

- A polyalphaolefin oil having a viscosity at 100 ° C of 4 cSt measured according to ASTM D445,

- A compound comprising a group dithiophosphate: zinc dithiophosphate (Lz 1371 sold by Lubrizol),

- A compound organomolybdenum 1: organomolybdenum complex of formula (Ia) wherein R represents a hydrocarbon group comprising 1 1 carbon atoms (Molyvan 855 sold by the Vanderbilt company)

- A fatty triamine of formula (VIII) wherein R 20 represents

hydrocarbon group comprising from 16 to 18 carbon atoms (Triameen YT marketed by the AKZO company).

The lubricating compositions # 7 to # 10 are described in Table VII; the percentages are percentages by weight.

Table VII

Test 5: assessment of lubricant compositions frictional properties on a steel / steel Contact

This is devalue the frictional properties of lubricating compositions # 7, # 8, # 9 and # 10 of the steel / steel contact by measuring the friction coefficient. The friction coefficient is evaluated as described in Test 1.

A difference of at least 0.01 between two friction coefficient values ​​is considered significant to show the influence on said friction coefficient.

Table VIII shows the coefficient of friction lubricant compositions No. 7, No. 8, No. 9 and No. 10.

Table VIII

These results show that the lubricating composition according to the invention No. 9 has improved friction properties on the steel / steel contact,

compared to a lubricating composition comprising an organomolybdenum compound of the invention and a compound comprising a group dithiophosphate according to the invention but not comprising a fatty triamine according to the invention (composition # 8) and compared to a lubricating composition comprising a fatty triamine according to the invention but not comprising organomolybdenum compound of the invention or compound comprising a group dithiophosphate according to the invention (composition # 10).

It is interesting to note that the lubricating compositions friction coefficients # 8 and # 10 are higher than the friction coefficient of the lubricant composition according to the invention No. 9, thus demonstrating a synergistic effect of the combination of an organomolybdenum compound of the invention, a compound comprising a group dithiophosphate according to the invention and of a fatty triamine according to the invention to reduce friction on steel / steel contact. In addition to these results for the coefficient of friction, it has been observed that by the use of the lubricating composition of the invention No. 9, the wear to the bead surface does not worsen, as compared to lubricating compositions No. 8 and 10.

Test 6: Evaluation of lubricating compositions frictional properties on a steel Contact / diamond

This is to evaluate the frictional properties of lubricating compositions # 7, # 8 and # 9 of the steel / diamond contacts, by measuring the friction coefficient. The friction coefficient is estimated using a linear tribometer ball nanodiamond / steel shot under the following conditions:

- Type of steel: 100C6,

- The nature of nanodiamond coating: nanocrystalline diamond layer comprising about 75% carbon hybridized carbon sp 3 (purity of about 75%), a thickness equal to 1, 5μ, surface roughness equal to 14nm, hardness around 74GPa and having a Young's modulus of 620GPa,

- Temperature: 80 ° C

- Normal load of 10N

- 5mm stroke.

A difference of at least 0.01 between two friction coefficient values ​​is considered significant to show the influence on said friction coefficient.

Table IX shows the coefficient of friction of the lubricating compositions # 7, # 8 and # 9.

Table IX

These results show that the lubricating composition according to the invention No. 9 has improved friction properties for steel / diamond contacts, with respect to a lubricant composition comprising an organomolybdenum compound of the invention and a compound comprising a group according dithiophosphate invention but not including fatty triamine of the invention (composition No. 8).

In addition to these results for the coefficient of friction, it has been observed that by the use of the lubricating composition of the invention No. 9, the wear of the nanodiamond coating of the beads was no increase compared to the lubricating composition No. 8.

Test 7: Evaluation of lubricating compositions frictional properties on a DLC Contact / steel

This is to evaluate the frictional properties of lubricating compositions # 7, # 8 and # 9 of the DLC / steel contact, by measuring the friction coefficient.

The friction coefficient is evaluated by the method described in Test 2.

A difference of at least 0.01 between two friction coefficient values ​​is considered significant to show the influence on said friction coefficient.

Table X shows the coefficient of friction of the lubricating compositions # 7, # 8 and # 9.

Paintings

Composition N°7 N°8 N°9

Coefficient 0.070 0.080 0.070

friction

steel / diamond

These results show that the lubricating composition according to the invention No. 9 has improved friction properties for the DLC / steel contact, in relation to a lubricating composition comprising an organomolybdenum compound of the invention and a compound comprising a group according dithiophosphate invention but not including fatty triamine of the invention (composition No. 8).

Thus, all examples and tests above show that the presence of a combination of an organomolybdenum compound of the invention, a compound comprising a group dithiophosphate according to the invention and of a fatty triamine according the invention in a lubricating composition serves to confer on said composition equivalent friction properties even improved both on steel contact / steel and steel / carbon coating contacts, and in particular on steel contact / nanodiamond but also contacts steel / DLC. The presence of such a combination in a lubricating composition also enables the lubricating composition to maintain good anti-wear properties, both contacts on steel / steel and steel / carbon coating contacts, and in particular on steel contact / nanodiamond but also steel / DLC contacts.

CLAIMS

lubricating composition comprising:

- At least a base oil,

- At least one organomolybdenum compound

- At least one compound comprising a dithiophosphate group, and

- At least one fatty triamine.

A lubricating composition according to claim 1 wherein the organomolybdenum compound is a molybdenum dithiocarbamate compound.

A lubricating composition according to claim 1 wherein the organomolybdenum compound is a molybdenum complex comprising at least one compound selected from:

- The compounds of formula (I)

in which :

• X 1 represents an oxygen atom or a nitrogen atom;

• X 2 represents an oxygen atom or a nitrogen atom;

• n represents 1 when X 1 represents an oxygen atom and m represents 1 when X 2 represents an oxygen atom;

• n is 2 when X 1 represents a nitrogen atom and m represents 2 when X 2 represents a nitrogen atom;

• R represents a linear or branched alkyl group, saturated or unsaturated, containing 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, preferably from 7 to 17 carbon atoms;

- The compounds of formula (II)

(II)

in which :

• X 1 represents an oxygen atom or a nitrogen atom;

• X 2 represents an oxygen atom or a nitrogen atom;

• n represents 1 when X 1 represents an oxygen atom and m represents 1 when X 2 represents an oxygen atom;

• n is 2 when X 1 represents a nitrogen atom and m represents 2 when X 2 represents a nitrogen atom;

• R represents a linear or branched alkyl group, saturated or unsaturated, containing 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, preferably from 7 to 17 carbon atoms;

• R 2 represents a linear or branched alkyl group, saturated or unsaturated, containing 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, preferably from 7 to 17 carbon atoms.

- A mixture of at least one compound of formula (I) and at least one compound of formula (II).

4. Lubricating composition according to claim 3 wherein the molybdenum complex comp)

(the)

wherein Ri represents a linear or branched alkyl group, saturated or unsaturated, containing 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, preferably from 7 to 17 carbon atoms.

5. Lubricating composition according to claim 3 wherein the molybdenum complex comprises at least one compound of formula (II-a)

wherein Ri represents a linear or branched alkyl group, saturated or unsaturated, containing 3 to 30 carbon atoms, preferably from 3 to 20 carbon atoms, preferably from 7 to 17 carbon atoms.

6. A lubricating composition according to any preceding claim wherein the weight content of organomolybdenum compound is from 0.05 to 3%, preferably 0.1 to 2%, preferably 0.1 to 1% the total weight of the lubricating composition.

7. A lubricating composition according to any one of the preceding claims wherein the compound comprising a dithiophosphate moiety is selected from the group consisting of ammonium dithiophosphates, amine dithiophosphates, dithiophosphates ester and metal dithiophosphates, taken alone or in admixture.

8. A lubricating composition according to any one of the preceding claims wherein the compound comprising a dithiophosphate moiety is a compound of formula (VII)

in which :

• is represents a linear or branched alkyl group, saturated or unsaturated, substituted or unsubstituted having from 1 to 30 carbon atoms;

• -i9 represents a linear or branched alkyl group, saturated or unsaturated, substituted or unsubstituted having from 1 to 30 carbon atoms;

• M represents a metal cation, preferably a cation Zn 2+ ;

• n represents the valence of the metal cation.

A lubricating composition according to any one of the preceding claims wherein the compound comprising a dithiophosphate moiety is a compound of formula (VII-a) or formula (VII-b):

(Vll-b)

in which :

• is represents a linear or branched alkyl group, saturated or unsaturated, substituted or unsubstituted having from 1 to 30 carbon atoms;

• R19 represents a linear or branched alkyl group, saturated or unsaturated, substituted or unsubstituted having from 1 to 30 carbon atoms.

10. A lubricating composition according to any preceding claim wherein the weight content of compound comprising a group dithiophosphate is from 0.1 to 5%, preferably from 0.1 to 3%, advantageously from 0.5 to 2 % relative to the total weight of the lubricating composition.

1 1. A lubricating composition according to any preceding claim wherein the fatty triamine is selected from:

- The compounds of formula (VIII)

R20-N-[(CH2)3-NH2]2

(WINE)

wherein R 20 represents a linear or branched alkyl group, saturated or unsaturated having at least 10 carbon atoms;

- The compounds of formula (IX)

R21-NH-(CH2-CH2-CH2-NH)2-H

(IX)

wherein R 2 i represents a linear or branched alkyl group, saturated or unsaturated having at least 10 carbon atoms.

12. A lubricating composition according to any preceding claim wherein the fatty triamine content by weight is from 0.1 to 5%, preferably from 0.1 to 3%, preferably 0.5 to 2% the total weight of the lubricating composition.

13. A lubricating composition according to any one of the preceding claims wherein the weight ratio (organomolybdenum compound / fatty triamine) is from 1/10 to 1, preferably from 1/5 to 4/5.

14. A lubricating composition according to any one of the preceding claims wherein the weight ratio (organomolybdenum compound / compound comprising a group

dithiophosphate / fatty triamine) is from 1/1/1 to 1/10/10, preferably from 1/5/5 to 4/5/5.

15. A lubricating composition according to any preceding claim further comprising at least one additive selected from detergents, anti-wear additives different ammonium dithiophosphates, amine dithiophosphates, ester dithiophosphates and dithiophosphates metal, extreme pressure additives, dispersants, pour point improvers of, antifoams, thickeners and mixtures thereof.

16. Use of a lubricating composition according to any one of claims 1 to 15 to reduce friction between two steel surfaces in a vehicle engine, preferably a motor vehicle.

17. Use of a lubricating composition according to any one of claims 1 to 15 to reduce friction between a steel surface and a surface covered with carbon in a motor vehicle, preferably a motor vehicle.

18. Use of a lubricating composition according to any one of claims 1 to 15 to reduce friction between two surfaces coated with carbon in a motor vehicle, preferably a motor vehicle.

19. Use of a lubricating composition according to any one of claims 1 to 15 to reduce vehicle fuel consumption, preferably motor vehicles.

20. The composition concentrate type of additives including:

- At least one organomolybdenum compound

- At least one compound comprising a dithiophosphate group, and

- At least one fatty triamine.