The present invention is applicable to the field of lubricant compositions, and more particularly to the field of lubricant compositions for marine engines, in particular marine engine four-stroke or two-stroke, preferably for marine four-stroke engine, or stationary engine. More particularly, the present invention relates to lubricating compositions whose use promotes fuel savings (Fuel Eco or FE or Eco Gas or GE) and having good properties in engine cleanliness, particularly cleanliness housing. The present invention also relates to a method for reducing the consumption of fuel, in particular fuel, a ship or a plant implementing this lubricating composition.

In the automotive field, due to environmental concerns, it is looking more and more to reduce emissions and achieve fuel savings. The nature of automotive engine lubricants influences these two phenomena, and engine lubricants for automobiles called "fuel eco" (in English terminology), have emerged. It is mainly the quality of the lubricant bases, alone or in combination with polymeric viscosity index improver and / or friction modifiers additives giving the lubricant its "fuel eco" properties. Fuel savings generated through engine lubricants' fuel eco "are essentially made at the cold start, when the engine is not yet in steady mode and not high-temperature-stabilized mode. In general, the consumer gains in the NEDC (New European Driving or New European Driving Cycle in English Cycle) in accordance with European Directive 70/220 / EEC are cold (urban cycle) of 5%, hot (extra cycle -Urbain) of 1, 5%, 2.5% for earnings.

But in the field of marine lubricants, marine engines operating at steady state, there is little cold starts. The solutions' fuel eco "adapted to automotive engines are not suitable for marine engines. In particular the consumer gains in the automotive field can not be obtained in the naval field.

Moreover, the issue of "fuel eco" is also highlighted in stationary engines for power plant.

Furthermore, the formulation of a lubricant 'fuel eco "and / or" gas-eco "should not come at the expense of other lubricating performance. In particular, the wear resistance, demulsification, the neutralizing capacity, and the cleanliness of the engine (piston and / or casing) must not be altered.

a lubricant composition comprising a block copolymer comprising an olefin and an aromatic vinyl block and in particular its use for reducing fouling of engines in particular are known WO 2007/121039. Also known from WO 2013/045648 a composition comprising at least one olefin copolymer, at least one hydrogenated styrene-isoprene copolymer, at least one glycerol ester and its use to improve the Fuel Eco and limited fouling of the engine. Finally, WO 2014/135596 known a lubricating composition comprising at least one alkoxylated fatty amine and at least one copolymer of styrene and hydrogenated isoprene and its use to improve the Fuel Eco and limited fouling of the engine.

So there is an interest to have a lubricating composition for a marine engine or stationary engine that enables fuel consumption reductions (oil and / or gas), including fuel, satisfactory, while keeping other performance the lubricating composition, particularly engine cleanliness, specifically the cleanliness of the housing.

There is also an interest to have a lubricant composition for marine engine or stationary engine having a good heat resistance under conditions of sévérisées use, especially in the presence of fuel (fuel oil and / or gas), in particular fuel. Indeed, during the combustion of oil or gas in the engine, residues and combustion of unburnt can pollute the lubricating composition and thus alter its thermal resistance and detergency properties.

An object of the present invention is therefore to provide a lubricating composition that overcomes entirely or in part the aforesaid drawbacks. In particular, an object of the present invention is to provide a lubricant composition for marine engine or stationary engine to a fuel saving (fuel and / or gas), in particular a gain of Fuel Eco (FE), while maintaining the engine cleanliness .

Another object of the present invention is to provide a lubrication method for fuel economy (fuel and / or gas), in particular fuel, whilst maintaining good engine cleanliness.

Other goals become apparent on reading the description of the invention that follows.

The invention thus provides a lubricant composition comprising:

- at least a base oil;

- at least one detergent;

- at least one olefin copolymer; and

- at least one hydrogenated linear styrene-butadiene copolymer.

Surprisingly, the Applicant has found that it was possible to formulate lubricating compositions for marine engines or stationary engines to significantly reduce fuel consumption (fuel oil and / or gas) including fuel (Fuel Eco), while maintaining or improving engine cleanliness, particularly cleanliness casing, compared to conventional lubricating compositions for marine engines or stationary engines. This is made possible thanks to a lubricating composition comprising at least one base oil, at least one detergent, at least one olefin copolymer and at least one hydrogenated linear styrene-butadiene copolymer.

Thus, the present invention allows the formulation of lubricating compositions for marine engine 4-stroke or 2-stroke, preferably 4 times, or for stationary engine, for combining both engine cleanliness and gain fuel economy (fuel and / or gas), in particular fuel (fuel Eco).

Advantageously, the lubricating compositions according to the invention exhibit improved heat resistance in terms sévérisées, more particularly in the presence of fuel, in particular fuel.

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

In one embodiment of the invention the styrene / hydrogenated butadiene linear and may be selected from styrene / hydrogenated butadiene or styrene / hydrogenated butadiene statistics, or mixtures thereof.

Advantageously, the styrene / hydrogenated linear butadiene has a hydrogenated butadiene unit content ranging from 50% to 98% by weight, preferably from 60% to 98%, more preferably from 60% to 90%, based on to the mass of hydrogenated styrene / butadiene copolymer and linear.

Advantageously, the styrene / hydrogenated linear butadiene has a hydrogenated butadiene unit content ranging from 50% to 98% by moles, preferably from 60% to 98%, more preferably from 70 to 97%, more preferably 70% to 95%, relative to the moles of styrene / hydrogenated butadiene and linear.

Advantageously, the styrene / hydrogenated linear butadiene rubber has a content of styrene units, from 2% to 50%, preferably from 2% to 40%, more preferably from 10% to 40% by weight based on the weight of hydrogenated styrene / butadiene copolymer and linear.

Advantageously, the styrene / hydrogenated linear butadiene rubber has a content of styrene units, from 2% to 50%, preferably from 2% to 40%, more preferably from 5% to 30% by mole relative to the number moles of hydrogenated styrene / butadiene copolymer and linear.

In one embodiment of the invention the styrene / hydrogenated linear butadiene according to the invention has an average molecular weight M w of from 80 000 to 500 000 Dalton, preferably 80 000 to 250 000 Dalton, more preferably from 80 000 to 200 000 daltons, more preferably from 80 000 to 150 000 daltons.

In one embodiment of the invention, styrene / butadiene copolymer and hydrogenated linear according to the invention has a polydispersity index of from 0.8 to 1, 4, preferably from 0.8 to 1, 2.

In one embodiment of the invention, the hydrogenated butadiene units are formed of 5 to 40% by weight of butadiene addition 1 -4, preferably 20 to 40% relative to the mass of butadiene units in the copolymer styrene / hydrogenated linear butadiene and 20 to 60% by mass of butadiene addition 1 -2, preferably from 30 to 60% relative to the mass of butadiene units in the styrene / hydrogenated butadiene and linear.

In another embodiment of the invention, the hydrogenated butadiene units are formed from 10 to 60 mol% of butadiene addition 1 -4, preferably 20 to 50% relative to the number of moles of butadiene units in the styrene / hydrogenated linear butadiene and 30 to 80 mol% of butadiene addition 1 -2, preferably from 40 to 60% relative to the number of moles of butadiene units in the styrene / hydrogenated butadiene and linear .

Examples of styrene / hydrogenated linear butadiene according to the invention, there may be mentioned styrene polymer / hydrogenated linear butadiene marketed by Lubrizol.

In one embodiment of the invention, the content by weight of styrene / hydrogenated butadiene and linear in the lubricating composition according to the invention is from 0.01% to 8% by weight, based on the total weight of the lubricating composition, preferably 0.1% to 5%, more preferably from 0.1% to 2%, preferably 0.1 to 1%. This quantity is defined as amount of active ingredient to polymer. Indeed, the styrene / hydrogenated linear butadiene used in the context of the present invention may be in the form of a dispersion in a mineral or synthetic oil, and more particularly in a Group I oil according to the API classification.

Preferably, the olefin copolymer is an ethylene-propylene copolymer.

These olefin copolymers are traditional copolymers based on ethylene units and propylene units, or optionally-based copolymers of ethylene units, propylene units and diene units (EPDM). Preferably, the olefin copolymer of the invention is an ethylene / propylene.

The olefin copolymer of the invention is in linear or star-shaped, preferably in linear form. The olefin copolymer of the invention is the form of blocks or in statistical form.

The olefin copolymer of the invention advantageously has an ethylene unit content ranging from 30% to 80% by weight, based on the weight of olefin copolymer, preferably from 30% to 70%, more preferably 40% 70%.

The olefin copolymer according to the invention also advantageously have a content of ethylene units ranging from 40% to 90% by mole, based on the number of moles of olefin copolymer, preferably from 40% to 80%, more preferably 50% to 80%.

The olefin copolymer of the invention advantageously has a propylene units content from 20% to 70% by weight, based on the weight of olefin copolymer, preferably from 20% to 60%, more preferably 20% 50%.

The olefin copolymer according to the invention also advantageously has a propylene units content from 10% to 60% by mole, based on the number of moles of olefin copolymer, preferably from 20% to 60%, more preferably from 20% to 50%.

The olefin copolymer of the invention advantageously has an average molecular weight Mw of between 40 000 and 220 000 daltons, preferably between 60,000 and 220,000 daltons, more preferably between 100 000 and 220 000 daltons, more preferably between 140 000 and 210 000 daltons.

The olefin copolymer of the invention advantageously has a polydispersity index of between 1, 5 and 5, preferably between 2 and 5, more preferably between 2 and 4, even more preferably between 2 and 3.5.

The amount of olefin copolymer in the lubricating composition according to the invention is from 0.01% to 5% by weight, based on the total weight of the lubricant composition, preferably 0.01% to 2%, more preferably from 0.01% to 1%, even more preferably from 0.1% to 1%. This amount means an amount of polymer solids. Indeed, the olefin copolymer used in the context of the present invention is sometimes diluted in a mineral or synthetic oil (usually a group 1 according to API oil classification).

In one embodiment, the lubricating composition according to the invention may comprise at least one detergent.

The detergents used in the lubricating compositions according to the present invention are well known to those skilled in the art.

Detergents commonly used in the formulation of lubricating compositions are typically anionic compounds comprising a lipophilic long hydrocarbon chain and a hydrophilic head. The associated cation is typically a metal cation of an alkali metal or alkaline earth metal.

The detergents according to the invention are selected from alkali metal salts or alkaline earth metal carboxylic acids, sulfonates, salicylates, naphthenates, phenates and taken alone or in admixture. Detergents are named according to the nature of the hydrophobic chain, carboxylate, sulfonate, salicylate, naphthenate or phenate.

Alkali metals and alkaline earth metals are preferably calcium, magnesium, sodium or barium, more preferably calcium.

The detergents used will not overbased (or neutral) or overbased. One speaks of non overbased detergents or "neutral" when the metal salts contain metal in an approximately stoichiometric amount. One speaks of overbased detergents, when the metal is in excess (in excess of the stoichiometric amount). The excess metal providing the character overbased detergent is in the form of insoluble metal salts in the oil. The overbased detergents are thus presented in the form of micelles composed of insoluble metallic salts maintained in suspension in the lubricating composition by detergents in the form of soluble metal salts in the oil. These micelles may contain one or more kinds of insoluble metal salts, stabilized by one or more types of detergents.

Preferred detergents are carboxylates, sulphonates and / or phenates, alone or in combination, in particular the carboxylate, sulfonate and / or calcium phenates.

The amount of detergent in the lubricating composition according to the invention is 1% to 30% by weight, based on the total weight of the lubricating composition, preferably from 1% to 25%, more preferably from 1% to 20% , even more preferably from 3% to 20%.

Preferably, the amount of detergent in the lubricating composition according to the invention is 10% to 30%, preferably from 10% to 25%, more preferably from 10% to 20%, by weight based on the total weight of said lubricating composition.

BN (Base Number as measured by ASTM D-2896) of the lubricating compositions according to the present invention, is wholly or partly provided by the neutral or overbased detergents based on alkali or alkaline earth metals.

BN value of the lubricating compositions according to the present invention, measured according to ASTM D-2896 can vary from 3 to 140 mg KOH / g, preferably from 3 to 80 mg KOH / g, more preferably 4 to 60 mg of KOH / g. The value of BN will be chosen according to the conditions of use of lubricating compositions and in particular according to the sulfur content of the fuel used.

Thus, for heavy fuel oil sulfur content ranging from 0.1% to 3.5% by weight, the BN value of the composition will be between 20 and 80 mg KOH / g, more preferably between 20 and 65 mg of KOH / g. These compositions are preferably implemented in 4T marine engines or stationary engines.

Thus also for heavy fuels with a sulfur content ranging from 0.1% to 3.5% by weight BN value of the composition will be between 20 and 140 mg KOH / g, more preferably between 20 and 100 mg KOH / g. These compositions are preferably implemented in marine engines 2T, especially for oil cylinders.

For sulfur content of diesel fuels from 0.05% to 2% by weight, the BN value of the composition is between 5 and 30 mg KOH / g, more preferably between 10 and 20 mg KOH / g. These compositions are preferably implemented in 4T marine engines or stationary engines.

For gases, BN value of the composition is less than 10 mg KOH / g, more preferably between 2 and 8 mg KOH / g. These compositions are preferably implemented in 4T marine engines or stationary engines.

In the following the present invention, the term essential additives, the additives described above that is to say a) at least one olefin copolymer, b) at least one copolymer of styrene and hydrogenated butadiene and linear, c ) at least one detergent as defined above.

In general, the base oil used in the formulation of lubricating compositions according to the invention may be chosen from oils of mineral origin, synthetic or vegetable as well as mixtures thereof.

Mineral or synthetic oils commonly used in the marine engine oil applying belong to one of the classes defined in the API classification as summarized in the table below.

Content content saturated sulfur viscosity index (VI)

Group 1 Mineral oils <90%> 80% 0.03 90% <80, 0.03% 90 % < 0.03 % > 120

hydro-isomerized oils

Group IV poly-alpha-olefins (PAO)

Other bases not included in groups 1 to basics

group V

IV

Group I mineral oils can be obtained by distillation of crude naphthenic or paraffinic selected followed by purification of these distillates by methods such as solvent extraction, solvent dewaxing or catalytic, hydrotreating or hydrogenation. Inorganic bases Group I are for example Solvent Neutral called bases (e.g. 150ns, 330NS, or 500ns 600ns) or brightstock.

Oils of Groups II and III are obtained by harsher purification methods, e.g., a combination from hydrotreating, hydrocracking, hydrogenation and catalytic dewaxing.

Examples of synthetic base IV and Group V include poly-alpha olefin, polybutenes, polyisobutenes, alkylbenzenes.

These base oils may be used alone or mixed. A mineral oil can be combined with a synthetic oil.

In a preferred embodiment of the invention, the lubricating base oil is selected from the base oils of Group I or Group II, taken alone or in mixture.

In one embodiment of the invention, the lubricating composition according to the invention can be characterized by a viscosimetric grade SAE 20, SAE 30, SAE 40, SAE 50 or SAE-60 according to SAEJ300 classification, preferably CAS-30 or CAS-40, preferably SAE-30.

Grade 20 oils have a kinematic viscosity at 100 ° C of between 5.6 and 9.3 cSt. Oils of grade 30 have a kinematic viscosity at 100 ° C of between 9.3 and 12.5 cSt. Grade 40 oils have a kinematic viscosity at 100 ° C between 12.5 and 16.3 cSt. grade 50 oils have a kinematic viscosity at 100 ° C of between 16.3 and 21, 9 cSt. Grade 60 oils have a kinematic viscosity at 100 ° C of between 21 9 and 26.1 cSt.

The kinematic viscosity is measured according to ASTM D7279 at 100 ° C.

In a preferred embodiment, the lubricating composition according to the invention has a kinematic viscosity measured according to ASTM D7279 at 100 ° C between 5.6 and 26.1 cSt, preferably between 9.3 and 21, 9 cSt , more preferably between 9.3 and 16.3 cSt.

In one embodiment of the invention, the content weight of base oil in the lubricating composition according to the invention is 40% to 95%, preferably from 50% to 95%, more preferably from 60% to 95%, advantageously from 60 to 85% relative to the total weight of the lubricating composition.

In one embodiment, the lubricating composition does not show up in the form of an emulsion.

In addition to the essential additives such as described above, the composition according to the invention can comprise at least one optional additive, in particular chosen from those commonly used by the skilled person. For example, the optional additive can be selected from dispersant additives, antiwear additives, antioxidants, friction modifiers, pour point improvers, antifoams, thickeners, fatty amines and their mixtures. They are well known in the art.

In one embodiment, the lubricating composition according to the invention may further comprise a dispersant.

Dispersants are well known additives used in the formulation of lubricating compositions, particularly for applications in the marine field. Their primary role is to maintain in suspension the particles initially present or appearing in the lubricant composition during its use in the engine. They prevent their agglomeration by adjusting the steric hindrance. They may also have a synergistic effect on neutralization.

Dispersants used as lubricant additives typically contain a polar group, associated with a relatively long hydrocarbon chain, generally containing 50 to 400 carbon atoms. The polar group typically contains at least one element nitrogen, oxygen or phosphorus.

In one embodiment of the invention, the dispersant may be chosen from derivatives of succinic acid. Among the derivatives of succinic acid is meant within the meaning of the invention, the esters of succinic acid or amides, esters of succinic acid. Preferably, the dispersant is selected from compounds comprising at least one succinimide group.

These compounds can then be treated with various compounds including sulfur, oxygen, formaldehyde, carboxylic acids and boron-containing compounds or zinc to produce, for example, borated succinimides or zinc-blocked succinimides.

In a preferred embodiment of the invention, the dispersant is selected from borated compounds comprising at least one succinimide group.

In a preferred embodiment of the invention, the dispersant may be selected from borate compounds comprising at least one group substituted succinimide or borated compounds comprising at least two groups substituted succinimide, the succinimide groups which can be connected at their top on a nitrogen atom by a polyamine moiety.

By succinimide group substituted as defined in the present invention means a succinimide group, at least one of the ring is substituted with a hydrocarbon group containing from 8 to 400 carbon atoms.

Advantageously, the dispersant is selected from borated compounds comprising at least one succinimide group substituted with a polyisobutene group.

Advantageously, the dispersant is selected from borated compounds comprising at least two succinimide groups each substituted with a polyisobutene group.

More advantageously, the dispersing agent is selected from borated compounds comprising at least two succinimide groups each substituted with a polyisobutene group and characterized by:

• Molecular weight of the polyisobutene greater than 2000 Daltons, preferably from 2000 to 5000 Daltons, preferably 2000 to 3000

Daltons,

• A content of greater elemental boron or 0.35% relative to the total mass of the dispersant.

Mannich bases, obtained by polycondensation of phenols substituted with alkyl groups, formaldehyde and primary or secondary amines, may also be used as a dispersant in the lubricating composition according to the invention.

In one embodiment of the invention, the dispersant content by weight is at least 0.1%, preferably from 0.1% to 10%, preferably 1% to 6% based on the total weight of the composition lubricating.

Antiwear additives protect the formation by rubbing surfaces of a protective film adsorbed on these surfaces. There are a wide variety of anti-wear additives. It may well include the phospho-sulfurized additives, such as metal alkylthiophosphates, especially zinc alkylthiophosphates, more specifically zinc dialkyldithiophosphates (or ZnDTP). The alkyl groups of such zinc dialkyldithiophosphates, preferably having 1 to 18 carbon atoms. Phosphates amines, polysulfides, such as sulfurized olefins, are also anti-wear additives used commonly. Are also encountered antiwear nitrogen and sulfur-type additives such as for example, metal dithiocarbamates, in particular dithiocarbamates of molybdenum. The

The antiwear additive by weight in the lubricant according to the invention is from 0.1% to 5%, preferably 0.2% to 4%, more preferably from 0.2% to 2% the total weight of the lubricating composition.

For example, for improvers additives pour point, polymethacrylates (PMA) can be used.

The lubricating composition according to the invention may also include friction modifiers. The friction modifiers help minimize friction between engine parts. These additives help to prevent engine damage while increasing fuel economy. Can be selected from organic molecules having a polar functional group at one end: and carboxylic acid derivatives, glycerol ester, imide, fatty amides, fatty amines and derivatives thereof, derivatives of phosphoric acid or phosphonic acid (phosphite or amine phosphate ). They act by chemical reaction to the metal surface or by absorption to the metal surface (hydrogen bonding).

Another type of friction modifier may be selected from organo-metal compounds: disthiophosphate molybdenum, molybdenum dithiocarbamate, copper oleate, copper salicylate.

Finally, the friction modifier may be a solid compound: the most common being molybdenum disulfide MoS 2, boron nitride, the polytetrafluoroethylene (PTFE). The content by weight of the friction modifier in the lubricant according to the invention is from 0.1% to 5%, preferably from 0.2% to 4%, more preferably from 0.2% to 2% by weight total lubricating composition.

Antifoaming additives may be selected from polar polymers such as polydimethylsiloxanes or polyacrylates.

These additives are generally present in a weight content of 0.01 to 3% based on the total weight of the lubricating composition.

Additives of the lubricant composition may also be selected from fatty amines and in particular from at least one fatty amine of the formula (I):

Ri - [(NR 2 ) -R 3 ] n-NR 4 R ' 1 5,

in which,

Ri is a saturated hydrocarbon group or unsaturated, linear or branched, comprising at least 12 carbon atoms, and optionally at least one heteroatom selected from nitrogen, sulfur or oxygen,

R 2 , R 4 or R 5 independently represents a hydrogen atom or a saturated hydrocarbon group or unsaturated, linear or branched, and optionally comprising at least one heteroatom selected from nitrogen, sulfur or oxygen,

• R 3 represents a saturated or unsaturated hydrocarbon group, straight or branched, comprising one or more atom (s) atoms, and optionally comprising at least one heteroatom selected from nitrogen, sulfur or oxygen, preferably the oxygen,

· N is greater than or equal to 0, preferably n is greater than or equal to 1, more preferably is an integer between 1 and 10, even more preferably between 1 and 6, preferably is selected from 1, 2 or 3.

Preferably, the fatty amine can be selected from fatty polyalkylamines mixtures comprising one or more polyalkylamines of formula (II) and / or (III):

in which

· R, identical or different, represents an alkyl group, linear or branched, comprising from 8 to 22 carbon atoms,

• n and z, independently of one another represent 0, 1, 2 or 3, and

• when z is greater than 0, o and p, independently of one another represent 0, 1, 2 or 3,

said mixture comprising at least 3% by weight of branched compounds such that at least one of n or z is greater than or equal to 1, or derivatives thereof.

In one embodiment, the weight percent fatty amine is between 1 and 15% based on the total weight of the lubricating composition, preferably between 1 and 10%.

Preferably, the lubricating composition according to the invention comprises:

- 0.01% to 8% by weight of styrene / hydrogenated butadiene and linear, preferably from 0.1% to 5%, more preferably from 0.1% to 2%, preferably 0.1 to 1%;

- 0.01% to 5% by weight olefin copolymer, preferably from 0.01% to 2%, more preferably from 0.01% to 1%, even more preferably from

0.1% to 1%;

1% to 30% by weight of detergent, preferably from 1% to 25%, more preferably from 1% to 20%, even more preferably from 3% to 20%.

Preferably, the lubricating composition according to the invention comprises:

- 0.01% to 8% by weight of styrene / hydrogenated butadiene and linear, preferably from 0.1% to 5%, more preferably from 0.1% to 2%, preferably 0.1 to 1%;

- 0.01% to 5% by weight olefin copolymer, preferably from 0.01% to 2%, more preferably from 0.01% to 1%, even more preferably from 0.1% to 1%;

10% to 30% by weight of detergent, preferably from 10% to 25%, more preferably from 10% to 20%.

As mentioned above:

the amount of styrene / hydrogenated butadiene copolymer and linear means in an amount of polymer active material;

the amount of olefin copolymer means an amount of active ingredient to polymer.

Advantageously, the lubricating composition according to the invention a fuel gain (Fuel Eco and / or gas Eco) greater than 0, 7% to 75% filler, preferably at least 0.8% to 75% of filler, more preferably at least 0.9% to 75% filler.

Advantageously, the lubricating composition according to the invention also allows a fuel gain (Fuel Eco and / or gas Eco) at least 0.9% to 100% load, preferably at least 1% 100 % load.

The lubricating composition according to the invention can be advantageously used in marine 4-stroke or 2-stroke, preferably 4-stroke, or stationary engines.

In a preferred embodiment, the lubricant composition is used in the fast 4-stroke engines or medium-speed, which operate respectively with distillate fuels and bunker or heavy fuel oil and also with gas. They can also be used as power generating units of large ships or implemented in stationary engines of diesel-electric power plants.

In particular, the lubricating composition is suitable for four-stroke engines as oil for piston sleeve also called TPEO oil.

In particular, the lubricating composition is suitable for two-stroke engines as oil or system oil cyclinder.

In particular, the lubricating composition is suitable for stationary engines as an oil piston to piston engine also called sheath TPEO oil.

Thus, the invention also relates to an oil for piston sleeve also called engine oil TPEO (Trunk Piston Engine Oil English) comprising a lubricating composition as defined above.

By oil piston engine piston sleeve also called TPEO oil of the invention is meant any lubricating composition for the lubrication of marine 4-stroke engines or stationary engines, in particular of the housing and cylinders.

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

By cylinder oil according to the invention is any lubricating composition for the lubrication of engines of cyclinders marine 2-stroke.

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

By oil system of the invention is meant any lubricating composition for the lubrication of the lower part of 2-stroke marine engines, including mannetons, the camshaft and the crankshaft for bearings. system oil also protects the housing and cools the piston heads.

Moreover, it also serves as a hydraulic fluid.

The invention also relates to the use of a lubricating composition as defined above for the lubrication of marine 4-stroke or 2-stroke or stationary engines. In a preferred embodiment, the invention relates to the use of a lubricating composition as defined above for the lubrication of marine 4-stroke engines or stationary engines.

The set of characteristics and preferences provided to the lubricant composition is applied to the use above.

The invention also relates to the use of a lubricating composition as defined above to reduce the fuel consumption (fuel and / or gas), in particular fuel, into an engine, in particular marine engines, 4-stroke or 2 time or stationary engines, while improving engine cleanliness, preferably cleanliness housing.

In a preferred embodiment, the invention relates to the use of a lubricating composition as defined above to reduce the fuel consumption, particularly fuel marine 4-stroke engines or stationary engines, while improving engine cleanliness, preferably cleanliness housing.

Reducing fuel consumption, in particular fuel, in particular is evaluated by engine bench testing or evaluation of traction coefficient test machine, including on-machine MTM (Mini Traction Machine).

The engine cleanliness is particularly valued by methods continuous ECBT.

The set of characteristics and preferences provided to the lubricant composition is applied to the use above.

The compounds as defined above contained in the lubricating composition according to the invention, especially the olefin copolymer and the styrene / hydrogenated butadiene may be incorporated in the lubricating composition as separate additives, in particular by separate addition of these in the base oils.

However, they can also be incorporated into an additive concentrate for marine lubricating composition or lubricant composition of stationary engine.

Thus, the invention also relates to a concentrated type of additive composition comprising:

- at least one detergent,

- at least olefin copolymer,

- at least a styrene / hydrogenated butadiene and linear.

All the characteristics and preferences presented for the detergent, olefin copolymer and styrene / hydrogenated linear butadiene and also applies to the above composition.

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

Another object of the invention relates to a method of reducing fuel consumption, especially of oil, and to improve engine cleanliness, particularly cleanliness casing, comprising contacting the lubricant composition as defined above or obtained from the concentrate as defined above, with a marine engine or a stationary engine.

All the characteristics and preferences presented to the lubricating composition or the concentrate such additive composition is also applicable to the lubrication method of 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 limitation.

Examples

The compositions Ci, C 2 , L 1; L 2 and L 3 are obtained from the following components: The olefin copolymer used in the examples comprises 67 mol% of ethylene units and 33 mol% of propylene units, 58% by weight of ethylene units and 42% by weight of propylene units and has an average molecular weight comprised between 170,000 Da and 200,000 Da. It has a viscosity at 1 00 ° C of 4500 cSt when diluted to a content of 7% by weight in a group 1 oil.

Commercial olefin copolymer is diluted to 5% by mass in a Group 1 base oil for the compositions and L 3 .

Commercial olefin copolymer is diluted to 2.3% by mass in a Group 1 base oil for the composition L 2 .

The hydrogenated linear styrene-butadiene copolymer used in the examples comprises 82% by moles of hydrogenated butadiene units (of which 32% by mole of units of butadiene addition 1 -4 and 50% by moles of units of butadiene addition 1 -2) and 18 mole% styrene units, 72% by weight of hydrogenated butadiene units (including 28% by weight of butadiene units of feed 1 and 44 -4% by weight of butadiene units adding 1 -2) and 29% by weight of styrene units.

It has an average molecular weight comprised between 120,000 Da and 150,000 Da and has a polydispersity index between 1 and 1, 1.

The hydrogenated styrene-butadiene copolymer and commercial linear is diluted to 8% by mass in a Group 1 base oil compositions for L 1; L 2 and L 3 .

- a detergent package 1 with agents containing calcium carboxylates, calcium phenates, an antiwear additive, zinc dithiophosphate (ZnDTP), an anti-foam and a friction modifier, the packet being diluted 40 and 60% by weight, in a group of base oil 1

- a detergent package 2 with agents containing calcium carboxylates, calcium phenates, an antiwear additive, zinc dithiophosphate (ZnDTP), an anti-foam, the packet being diluted between 40 and 60% by weight in a group of base oil 1

- Group 2 base oils, in particular called bases 100R and 220R, respectively, a viscosity of 4.1 cSt and 6.4 cSt at 100 ° C and 20.2 cSt and 41 cSt at 40 ° 5 C

- Group 1 base oils, in particular bases called Solvent Neutral 100NS and 150ns, 4.1 cSt viscosity respectively and 5.3 cSt at 100 ° C and 20.2 cSt and 31 cSt at 40 ° 0 C.

CLAIMS

1 .- A lubricating composition comprising:

- at least a base oil;

- at least one detergent in an amount ranging from 10% to 30% by weight based on the total weight of said lubricating composition;

- at least one olefin copolymer;

- at least a styrene / hydrogenated butadiene and linear.

2. Lubricating composition according to claim 1 wherein in the styrene / hydrogenated linear butadiene and the hydrogenated butadiene unit content is from 50% to 98% by mole, preferably 60% to 98%, more preferably 70 % to 97%, relative to moles of hydrogenated styrene / butadiene copolymer and linear.

3. - A lubricating composition according to claim 1 or 2, wherein the content by weight of styrene / hydrogenated butadiene linear and is from 0.01% to 8% by weight, based on the total weight of the lubricating composition, preferably from 0.1% to 5%, more preferably from 0.1% to 2%, preferably 0.1 to 1%.

4. - A lubricant composition according to any one of claims 1 to 3, wherein the olefin copolymer is an ethylene-propylene copolymer.

5. - A lubricating composition according to claim 4, wherein the ethylene / propylene copolymer comprises an ethylene unit content of from 30% to 80% by weight based on the weight of olefin copolymer, preferably from 30% to 70% , more preferably from 40% to 70%.

6. - A lubricant composition according to any one of claims 1 to 5, wherein the amount of olefin copolymer is from 0.01% to 5% by weight, based on the total weight of the lubricating composition, preferably 0 , 01% to 2%, more preferably from 0.01% to 1%, even more preferably from 0.1% to 1%.

7. A lubricating composition according to any one of claims 1 to 6, wherein the amount of detergent is 10% to 25% by weight based on the total weight of the lubricating composition, and preferably from 10% to 20 %.

8. A lubricating composition according to any one of claims 1 to 7, comprising:

- 0.01% to 8% by weight of styrene / hydrogenated butadiene and linear;

- 0.01% to 5 mass% olefin copolymer;

10% to 30% by weight of detergent.

9.- Use of a lubricating composition according to any one of claims 1 to 8 for the lubrication of marine 4-stroke or 2-stroke, preferably 4-stroke engine or stationary.

10.- Use of a lubricating composition according to any one of claims 1 to 8 to reduce the fuel consumption while improving engine cleanliness marine 4-stroke or 2-stroke, preferably 4-stroke engine or stationary .