MARINE ENGINE LUBRICATION

Description

FIELD OF THE INVENTION

[0001] This invention relates to a trunk piston marine engine lubricating composition for a medium-speed four-stroke compression-ignited (diesel) marine engine and lubrication of such an engine.

BACKGROUND OF THE INVENTION

[0002] Marine trunk piston engines generally use Heavy Fuel Oil ('HFO') for offshore running. Heavy Fuel Oil is the heaviest fraction of petroleum distillate and comprises a complex mixture of molecules including up to 15% of asphaltenes, defined as the fraction of petroleum distillate that is insoluble in an excess of aliphatic hydrocarbon (e.g. heptane) but which is soluble in aromatic solvents (e.g. toluene). Asphaltenes can enter the engine lubricant as contaminants either via the cylinder or the fuel pumps and injectors, and asphaltene precipitation can then occur, manifested in 'black paint' or 'black sludge' in the engine. The presence of such carbonaceous deposits on a piston surface can act as an insulating layer which can result in the formation of cracks that then propagate through the piston. If a crack travels through the piston, hot combustion gases can enter the crankcase, possibly resulting in a crankcase explosion.

[0003] It is therefore highly desirable that trunk piston engine oils ('TPEO's) prevent or inhibit asphaltene precipitation. The prior art describes ways of doing this.

[0004] WO 96/26995 discloses the use of a hydrocarbyl-substituted phenol to reduce 'black paint' in a diesel engine. WO 96/26996 discloses the use of a demulsifier for water-in-oil emulsions, for example, a polyoxyalkylene polyol, to reduce 'black paint' in diesel engines. US-B2-7,053,027 describes use of one or more overbased metal carboxylate detergents in combination with an antiwear additive in a dispersant-free TPEO.

[0005] The problem of asphaltene precipitation is more acute at higher basestock saturate levels. WO 2008/128656 describes a solution by use of an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having a basicity index of less than 2 and a degree of carbonation of 80% or greater in a marine trunk piston engine lubricant to reduce asphaltene precipitation in the lubricant. Exemplified are lubricants comprising a Group II basestock, which has a higher basestock saturate level than a Group I basestock.

[0006] The above-described solution is however restricted to a specific class of detergents. It is now found, in the present invention, that the problem in WO 2008/128656 is solved for a different range of overbased metal carboxylate detergents by employing, in combination therewith, a hydrocarbyl-substituted carboxylic acid, anhydride, ester or amide in Group II basestocks.

SUMMARY OF THE INVENTION

[0007] A first aspect of the invention is a trunk piston marine engine lubricating oil composition for improving asphaltene handling in use thereof, in operation of the engine when fuelled by a heavy fuel oil, which composition comprises or is made by admixing an oil of lubricating viscosity, in a major amount, containing 50 mass % or more of a Group II basestock, and, in respective minor amounts:

(A) an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having:

(A1) a basicity index of two or greater and a degree of carbonation of 80% or greater; or

(A2) a basicity index of two or greater and a degree of carbonation of less than 80%; or

(A3) a basicity index of less than two and a degree of carbonation of less than 80%;

where degree of carbonation is the percentage of carbonate present in the overbased metal hydrocarbyl-substituted hydroxybenzoate detergent expressed as a mole percentage relative to the total excess base in the detergent; and

(B) a hydrocarbyl-substituted carboxylic acid or anhydride thereof, wherein the or at least one hydrocarbyl group contains at least eight carbon atoms; the acid or anhydride constituting at least 1 and up to 10 mass % of the lubricating oil composition;

wherein the treat rate of additives (A) and (B) contained in the lubricating oil composition is in the range of 2 to 20 mass %.

[0008] A second aspect of the invention is the use of a detergent (A) in combination with a carboxylic acid or anhydride (B), and in the amounts stated in the first aspect of the invention, in a trunk piston marine lubricating oil composition for a medium-speed compression-ignited marine engine, which composition comprises an oil of lubricating viscosity in a major amount and contains 50 mass % or more of a Group II basestock, to improve asphaltene handling during operation of the engine, fueled by a heavy fuel oil, and its lubrication by the composition, in comparison with analogous operation when the same amount of detergent (A) is used in the absence of(B).

[0009] A third aspect of the invention is a method of operating a trunk piston medium-speed compression-ignited marine engine comprising

(i) fueling the engine with a heavy fuel oil; and

(ii) lubricating the crankcase of the engine with a composition as defined in the first aspect of the invention.

[0010] A fourth aspect of the invention is a method of dispersing asphaltenes in a trunk piston marine lubricating oil composition during its lubrication of surfaces of the combustion chamber of a medium-speed compression-ignited marine engine and operation of the engine, which method comprises

(i) providing a composition as defined in the first aspect of the invention;

(ii) providing the composition in the combustion chamber;

(iii) providing heavy fuel oil in the combustion chamber; and

(iv) combusting the heavy fuel oil in the combustion chamber.

[0011] In this specification, the following words and expressions, if and when used, have the meanings ascribed below:

"active ingredients" or "(a.i.)" refers to additive material that is not diluent or solvent;

"comprising" or any cognate word specifies the presence of stated features, steps, or integers or components, but does not preclude the presence or addition of one or more other features, steps, integers, components or groups thereof, the expressions

"consists of" or "consists essentially of" or cognates may be embraced within "comprises" or cognates, wherein "consists essentially of" permits inclusion of substances not materially affecting the characteristics of the composition to which it applies;

"major amount" means in excess of 50 mass % of a composition;

"minor amount" means less than 50 mass % of a composition;

"TBN" means total base number as measured by ASTM D2896.

Furthermore in this specification:

"calcium content" is as measured by ASTM 4951;

"phosphorus content" is as measured by ASTM D5185;

"sulphated ash content" is as measured by ASTM D874;

"sulphur content" is as measured by ASTM D2622;

"KV100" means kinematic viscosity at 100°C as measured by ASTM D445.

[0012] Also, it will be understood that various components used, essential as well as optimal and customary, may react under conditions of formulation, storage or use and that the invention also provides the product obtainable or obtained as a result of any such reaction.

[0013] Further, it is understood that any upper and lower quantity, range and ratio limits set forth herein may be independently combined.

DETAILED DESCRIPTION OF THE INVENTION

[0014] The features of the invention will now be discussed in more detail below.

OIL OF LUBRICATING VISCOSITY

[0015] The lubricating oils may range in viscosity from light distillate mineral oils to heavy lubricating oils. Generally, the viscosity of the oil ranges from 2 to 40 mm²/sec, as measured at 100°C.

[0016] Natural oils include animal oils and vegetable oils (e.g., caster oil, lard oil); liquid petroleum oils and hydrorefined, solvent-treated or acid-treated mineral oils of the paraffinic, naphthenic and mixed paraffinic-naphthenic types. Oils of lubricating viscosity derived from coal or shale also serve as useful base oils.

[0017] Synthetic lubricating oils include hydrocarbon oils and halo-substituted hydrocarbon oils such as polymerized and interpolymerized olefins (e.g., polybutylenes, polypropylenes, propylene-isobutylene copolymers, chlorinated polybutylenes, poly(1-hexenes), poly(1-octenes), poly(1-decenes)); alkybenzenes (e.g., dodecylbenzenes, tetradecylbenzenes, dinonylbenzenes, di(2-ethylhexyl)benzenes); polyphenyls (e.g., biphenyls, terphenyls, alkylated polyphenols); and alkylated diphenyl ethers and alkylated diphenyl sulphides and derivative, analogs and homologs thereof.

[0018] Alkylene oxide polymers and interpolymers and derivatives thereof where the terminal hydroxyl groups have been modified by esterification, etherification, etc., constitute another class of known synthetic lubricating oils. These are exemplified by polyoxyalkylene polymers prepared by polymerization of ethylene oxide or propylene oxide, and the alkyl and aryl ethers of polyoxyalkylene polymers (e.g., methyl-polyiso-propylene glycol ether having a molecular weight of 1000 or diphenyl ether of poly-ethylene glycol having a molecular weight of 1000 to 1500); and mono- and polycarboxylic esters thereof, for example, the acetic acid esters, mixed C₃-C₈ fatty acid esters and C₁₃ Oxo acid diester of tetraethylene glycol.

[0019] Another suitable class of synthetic lubricating oils comprises the esters of dicarboxylic acids (e.g., phthalic acid, succinic acid, alkyl succinic acids and alkenyl succinic acids, maleic acid, azelaic acid, suberic acid, sebasic acid, fumaric acid, adipic acid, linoleic acid dimer, malonic acid, alkylmalonic acids, alkenyl malonic acids) with a variety of alcohols (e.g., butyl alcohol, hexyl alcohol, dodecyl alcohol, 2-ethylhexyl alcohol, ethylene glycol, diethylene glycol monoether, propylene glycol). Specific examples of such esters includes dibutyl adipate, di(2-ethylhexyl) sebacate, di-n-hexyl fumarate, dioctyl sebacate, diisooctyl azelate, diisodecyl azelate, dioctyl phthalate, didecyl phthalate, dieicosyl sebacate, the 2-ethylhexyl diester of linoleic acid dimer, and the complex ester formed by reacting one mole of sebacic acid with two moles of tetraethylene glycol and two moles of 2-ethylhexanoic acid.

[0020] Esters useful as synthetic oils also include those made from C₅ to C₁₂ monocarboxylic acids and polyols and polyol esters such as neopentyl glycol, trimethylolpropane, pentaerythritol, dipentaerythritol and tripentaerythritol.

[0021] Silicon-based oils such as the polyalkyl-, polyaryl-, polyalkoxy- or polyaryloxysilicone oils and silicate oils comprise another useful class of synthetic lubricants; such oils include tetraethyl silicate, tetraisopropyl silicate, tetra-(2-ethylhexyl)silicate, tetra-(4-methyl-2-ethylhexyl)silicate, tetra-(p-tert-butyl-phenyl) silicate, hexa-(4-methyl-2-ethylhexyl)disiloxane, poly(methyl)siloxanes and poly(methylphenyl)siloxanes. Other synthetic lubricating oils include liquid esters of phosphorous-containing acids (e.g., tricresyl phosphate, trioctyl phosphate, diethyl ester of decylphosphonic acid) and polymeric tetrahydrofurans.

[0022] Unrefined, refined and re-refined oils can be used in lubricants of the present invention. Unrefined oils are those obtained directly from a natural or synthetic source without further purification treatment. For example, a shale oil obtained directly from retorting operations; petroleum oil obtained directly from distillation; or ester oil obtained directly from an esterification and used without further treatment would be an unrefined oil. Refined oils are similar to unrefined oils except that the oil is further treated in one or more purification steps to improve one or more properties. Many such purification techniques, such as distillation, solvent extraction, acid or base extraction, filtration and percolation are known to those skilled in the art. Re-refined oils are obtained by processes similar to those used to provide refined oils but begin with oil that has already been used in service. Such re-refined oils are also known as reclaimed or reprocessed oils and are often subjected to additional processing using techniques for removing spent additives and oil breakdown products.

[0023] Definitions for the base stocks and base oils in this invention are the same as those found in the American Petroleum Institute (API) publication "Engine Oil Licensing and Certification System", Industry Services Department, Fourteenth Edition, December 1996, Addendum 1, December 1998. Said publication categorizes base stocks as follows:

a) Group I base stocks contain less than 90 percent saturates and/or greater than 0.03 percent sulphur and have a viscosity index greater than or equal to 80 and less than 120 using the test methods specified in Table E-1.

b) Group II base stocks contain greater than or equal to 90 percent saturates and less than or equal to 0.03 percent sulphur and have a viscosity index greater than or equal to 80 and less than 120 using the test methods specified in Table E-1.

c) Group III base stocks contain greater than or equal to 90 percent saturates and less than or equal to 0.03 percent sulphur and have a viscosity index greater than or equal to 120 using the test methods specified in Table E-1.

d) Group IV base stocks are polyalphaolefins (PAO).

e) Group V base stocks include all other base stocks not included in Group I, II, III, or IV.

[0024] Analytical Methods for Base Stock are tabulated below:

PROPERTY	TEST METHOD
Saturates	ASTM D 2007
Viscosity Index	ASTM D 2270
Sulphur	ASTM D 2622
	ASTM D 4294
	ASTM D 4927
	ASTM D 3120

[0025] As stated, the oil of lubricating viscosity in this invention contains 50 mass % or more of a Group II basestock. Preferably, it contains 60, such as 70, 80 or 90, mass % or more of a Group II basestock. The oil of lubricating viscosity may be substantially all Group II basestock.

OVERBASED METAL DETERGENT (A)

[0026] A metal detergent is an additive based on so-called metal "soaps", that is metal salts of acidic organic compounds, sometimes referred to as surfactants. They generally comprise a polar head with a long hydrophobic tail. Overbased metal detergents, which comprise neutralized metal detergents as the outer layer of a metal base (e.g. carbonate) micelle, may be provided by including large amounts of metal base by reacting an excess of a metal base, such as an oxide or hydroxide, with an acidic gas such as carbon dioxide.

[0027] In the present invention, overbased metal detergents (A) are overbased metal hydrocarbyl-substituted hydroxybenzoate, preferably hydrocarbyl-substituted salicylate, detergents.

[0028] "Hydrocarbyl" means a group or radical that contains carbon and hydrogen atoms and that is bonded to the remainder of the molecule via a carbon atom. It may contain hetero atoms, i.e. atoms other than carbon and hydrogen, provided they do not alter the essentially hydrocarbon nature and characteristics of the group. As examples of hydrocarbyl, there may be mentioned alkyl and alkenyl. The overbased metal hydrocarbyl-substituted hydroxybenzoate typically has the structure shown:

wherein R is a linear or branched aliphatic hydrocarbyl group, and more preferably an alkyl group, including straight- or branched-chain alkyl groups. There may be more than one R group attached to the benzene ring. M is an alkali metal (e.g. lithium, sodium or potassium) or alkaline earth metal (e.g. calcium, magnesium barium or strontium). Calcium or magnesium is preferred; calcium is especially preferred. The COOM group can be in the ortho, meta or para position with respect to the hydroxyl group; the ortho position is preferred. The R group can be in the ortho, meta or para position with respect to the hydroxyl group.

[0029] Hydroxybenzoic acids are typically prepared by the carboxylation, by the Kolbe-Schmitt process, of phenoxides, and in that case, will generally be obtained (normally in a diluent) in admixture with uncarboxylated phenol. Hydroxybenzoic acids may be non-sulphurized or sulphurized, and may be chemically modified and/or contain additional substituents. Processes for sulphurizing a hydrocarbyl-substituted hydroxybenzoic acid are well known to those skilled in the art, and are described, for example, in US 2007/0027057.

[0030] In hydrocarbyl-substituted hydroxybenzoic acids, the hydrocarbyl group is preferably alkyl (including straight- or branched-chain alkyl groups), and the alkyl groups advantageously contain 5 to 100, preferably 9 to 30, especially 14 to 24, carbon atoms.

[0031] The term "overbased" is generally used to describe metal detergents in which the ratio of the number of equivalents of the metal moiety to the number of equivalents of the acid moiety is greater than one. The term 'low-based' is used to describe metal detergents in which the equivalent ratio of metal moiety to acid moiety is greater than 1, and up to about 2.

[0032] By an "overbased calcium salt of surfactants" is meant an overbased detergent in which the metal cations of the oil-insoluble metal salt are essentially calcium cations. Small amounts of other cations may be present in the oil-insoluble metal salt, but typically at least 80, more typically at least 90, for example at least 95, mole %, of the cations in the oil-insoluble metal salt, are calcium ions. Cations other than calcium may be derived, for example, from the use in the manufacture of the overbased detergent of a surfactant salt in which the cation is a metal other than calcium. Preferably, the metal salt of the surfactant is also calcium.

[0033] Carbonated overbased metal detergents typically comprise amorphous nanoparticles. Additionally, there are disclosures of nanoparticulate materials comprising carbonate in the crystalline calcite and vaterite forms.

[0034] The basicity of the detergents may be expressed as a total base number (TBN). A total base number is the amount of acid needed to neutralize all of the basicity of the overbased material. The TBN may be measured using ASTM standard D2896 or an equivalent procedure. The detergent may have a low TBN (i.e. a TBN of less than 50), a medium TBN (i.e. a TBN of 50 to 150) or a high TBN (i.e. a TBN of greater than 150, such as 150-500). In this invention, Basicity Index and Degree of Carbonation may be used. Basicity Index is the molar ratio of total base to total soap in the overbased detergent. Degree of Carbonation is the percentage of carbonate present in the overbased detergent expressed as a mole percentage relative to the total excess base in the detergent.

[0035] Overbased metal hydrocarbyl-substituted hydroxybenzoates can be prepared by any of the techniques employed in the art. A general method is as follows:

1. Neutralisation of hydrocarbyl-substituted hydroxybenzoic acid with a molar excess of metallic base to produce a slightly overbased metal hydrocarbyl-substituted hydroxybenzoate complex, in a solvent mixture consisting of a volatile hydrocarbon, an alcohol and water;

2. Carbonation to produce colloidally-dispersed metal carbonate followed by a post-reaction period;

3. Removal of residual solids that are not colloidally dispersed; and

4. Stripping to remove process solvents.

[0036] Overbased metal hydrocarbyl-substituted hydroxybenzoates can be made by either a batch or a continuous overbasing process.

[0037] Metal base (e.g. metal hydroxide, metal oxide or metal alkoxide), preferably lime (calcium hydroxide), may be charged in one or more stages. The charges may be equal or may differ, as may the carbon dioxide charges which follow them. When adding a further calcium hydroxide charge, the carbon dioxide treatment of the previous stage need not be complete. As carbonation proceeds, dissolved hydroxide is converted into colloidal carbonate particles dispersed in the mixture of volatile hydrocarbon solvent and non-volatile hydrocarbon oil.

[0038] Carbonation may by effected in one or more stages over a range of temperatures up to the reflux temperature of the alcohol promoters. Addition temperatures may be similar, or different, or may vary during each addition stage. Phases in which temperatures are raised, and optionally then reduced, may precede further carbonation steps.

[0039] The volatile hydrocarbon solvent of the reaction mixture is preferably a normally liquid aromatic hydrocarbon having a boiling point not greater than about 150°C. Aromatic hydrocarbons have been found to offer certain benefits, e.g. improved filtration rates, and examples of suitable solvents are toluene, xylene, and ethyl benzene.

[0040] The alkanol is preferably methanol although other alcohols such as ethanol can be used. Correct choice of the ratio of alkanol to hydrocarbon solvents, and the water content of the initial reaction mixture, are important to obtain the desired product.

[0041] Oil may be added to the reaction mixture; if so, suitable oils include hydrocarbon oils, particularly those of mineral origin. Oils which have viscosities of 15 to 30 mm²/sec at 38°C are very suitable.

[0042] After the final treatment with carbon dioxide, the reaction mixture is typically heated to an elevated temperature, e.g. above 130°C, to remove volatile materials (water and any remaining alkanol and hydrocarbon solvent). When the synthesis is complete, the raw product is hazy as a result of the presence of suspended sediments. It is clarified by, for example, filtration or centrifugation. These measures may be used before, or at an intermediate point, or after solvent removal.

[0043] The products are generally used as an oil solution. If the reaction mixture contains insufficient oil to retain an oil solution after removal of the volatiles, further oil should be added. This may occur before, or at an intermediate point, or after solvent removal.

[0044] In this invention, (A) may have:

(A1) a basicity index of two or greater and a degree of carbonation of 80% or greater; or

(A2) a basicity index of two or greater and a degree of carbonation of less than 80%; or

(A3) a basicity index of less than two and a degree of carbonation of less than 80%.

CARBOXYLIC ACID OR ANHYDRIDE THEREOF (B)

[0045] As stated, the acid or anhydride thereof constitutes at least 1 mass % and up to 10 mass % of the lubricating oil composition. Preferably it constitutes from 1.5 and up to 10, such as 2 to 10, for example 3 to 6, mass %. (B) may be a mixture.

[0046] The acid may be mono or polycarboxylic, preferably dicarboxylic, acid. The hydrocarbyl group preferably has from 8 to 400, such as 8 to 100, carbon atoms.

[0047] As (B), an anhydride of a dicarboxylic acid is preferred.

[0048] Preferably, the hydrocarbyl group is a polyalkenyl group. Such polyalkenyl moiety may have a number average molecular weight of from 200 to 3000, preferably from 350 to 950.

[0049] Suitable hydrocarbons or polymers employed in the formation of the acid/derivative of the present invention include homopolymers, interpolymers or lower molecular weight hydrocarbons. One family of such polymers comprise polymers of ethylene and/or at least one C₃ to C₂₈ alpha-olefin having the formula H₂C=CHR¹ wherein R¹ is straight or branched chain alkyl radical comprising 1 to 26 carbon atoms and wherein the polymer contains carbon-to-carbon unsaturation, preferably a high degree of terminal ethenylidene unsaturation. Preferably, such polymers comprise interpolymers of ethylene and at least one alpha-olefin of the above formula, wherein R¹ is alkyl of from 1 to 18 carbon atoms, and more preferably is alkyl of from 1 to 8 carbon atoms, and more preferably still of from 1 to 2 carbon atoms. Therefore, useful alpha-olefin monomers and comonomers include, for example, propylene, butene-1, hexene-1, octene-1, 4-methylpentene-1, decene-1, dodecene-1, tridecene-1, tetradecene-1, pentadecene-1, hexadecene-1, heptadecene-1, octadecene-1, nonadecene-1, and mixtures thereof (e.g., mixtures of propylene and butene-1, and the like). Exemplary of such polymers are propylene homopolymers, butene-1 homopolymers, ethylene-propylene copolymers, ethylene-butene-1 copolymers, propylene-butene copolymers and the like, wherein the polymer contains at least some terminal and/or internal unsaturation. Preferred polymers are unsaturated copolymers of ethylene and propylene and ethylene and butene-1. The interpolymers of this invention may contain a minor amount, e.g. 0.5 to 5 mole % of a C₄ to C₁₈ non-conjugated diolefin comonomer. However, it is preferred that the polymers of this invention comprise only alpha-olefin homopolymers, interpolymers of alpha-olefin comonomers and interpolymers of ethylene and alpha-olefin comonomers. The molar ethylene content of the polymers employed in this invention is preferably in the range of 0 to 80 %, and more preferably 0 to 60 %. When propylene and/or butene-1 are employed as comonomer(s) with ethylene, the ethylene content of such copolymers is most preferably between 15 and 50 %, although higher or lower ethylene contents may be present.

[0050] These polymers may be prepared by polymerizing alpha-olefin monomer, or mixtures of alpha-olefin monomers, or mixtures comprising ethylene and at least one C₃ to C₂₈ alpha-olefin monomer, in the presence of a catalyst system comprising at least one metallocene (e.g., a cyclopentadienyl-transition metal compound) and an alumoxane compound. Using this process, a polymer in which 95 % or more of the polymer chains possess terminal ethenylidene-type unsaturation can be provided. The percentage of polymer chains exhibiting terminal ethenylidene unsaturation may be determined by FTIR spectroscopic analysis, titration, or C¹³ NMR. Interpolymers of this latter type may be characterized by the formula POLY-C(R¹)=CH₂ wherein R¹ is C₁ to C₂₆ alkyl, preferably C₁ to C₁₈ alkyl, more preferably C₁ to C₈ alkyl, and most preferably C₁ to C₂ alkyl, (e.g., methyl or ethyl) and wherein POLY represents the polymer chain. The chain length of the R¹ alkyl group will vary depending on the comonomer(s) selected for use in the polymerization. A minor amount of the polymer chains can contain terminal ethenyl, i.e., vinyl, unsaturation, i.e. POLY-CH=CH₂, and a portion of the polymers can contain internal monounsaturation, e.g. POLY-CH=CH(R¹), wherein R¹ is as defined above. These terminally unsaturated interpolymers may be prepared by known metallocene chemistry and may also be prepared as described in U.S. Patent Nos. 5,498,809; 5,663,130; 5,705,577; 5,814,715; 6,022,929 and 6,030,930.

[0051] Another useful class of polymers is polymers prepared by cationic polymerization of isobutene, styrene, and the like. Common polymers from this class include polyisobutenes obtained by polymerization of a C₄ refinery stream having a butene content of about 35 to about 75 mass %, and an isobutene content of about 30 to about 60 mass %, in the presence of a Lewis acid catalyst, such as aluminum trichloride or boron trifluoride. A preferred source of monomer for making poly-n-butenes is petroleum feedstreams such as Raffinate II. These feedstocks are disclosed in the art such as in U.S. Patent No. 4,952,739. Polyisobutylene is a most preferred backbone of the present invention because it is readily available by cationic polymerization from butene streams (e.g., using AlCl₃ or BF₃ catalysts). Such polyisobutylenes generally contain residual unsaturation in amounts of about one ethylenic double bond per polymer chain, positioned along the chain. A preferred embodiment utilizes poiyisobutyiene prepared from a pure isobutylene stream or a Raffinate I stream to prepare reactive isobutylene polymers with terminal vinylidene olefins. Preferably, these polymers, referred to as highly reactive polyisobutylene (HR-PIB), have a terminal vinylidene content of at least 65%, e.g., 70%, more preferably at least 80%, most preferably, at least 85%. The preparation of such polymers is described, for example, in U.S. Patent No. 4,152,499. HR-PIB is known and HR-PIB is commercially available under the tradenames Glissopal™ (from BASF) and Ultravis™ (from BP-Amoco).

[0052] Polyisobutylene polymers that may be employed are generally based on a hydrocarbon chain of from 400 to 3000. Methods for making polyisobutylene are known. Polyisobutylene can be functionalized by halogenation (e.g. chlorination), the thermal "ene" reaction, or by free radical grafting using a catalyst (e.g. peroxide), as described below.

[0053] To produce (B) the hydrocarbon or polymer backbone may be functionalized, with carboxylic acid producing moieties (acid or anhydride moieties) selectively at sites of carbon-to-carbon unsaturation on the polymer or hydrocarbon chains, or randomly along chains using any of the three processes mentioned above or combinations thereof, in any sequence.

[0054] Processes for reacting polymeric hydrocarbons with unsaturated carboxylic acids and anhydrides and the preparation of derivatives from such compounds are disclosed in U.S. Patent Nos. 3,087,936; 3,172,892; 3,215,707; 3,231,587; 3,272,746; 3,275,554; 3,381,022; 3,442,808; 3,565,804; 3,912,764; 4,110,349; 4,234,435; 5,777,025; 5,891,953; as well as EP 0 382 450 B1; CA-1,335,895 and GB-A-1,440,219. The polymer or hydrocarbon may be functionalized, with carboxylic acid producing moieties (acid or anhydride) by reacting the polymer or hydrocarbon under conditions that result in the addition of functional moieties or agents, i.e., acid or anhydride moieties, etc., onto the polymer or hydrocarbon chains primarily at sites of carbon-to-carbon unsaturation (also referred to as ethylenic or olefinic unsaturation) using the halogen assisted functionalization (e.g. chlorination) process or the thermal "ene" reaction.

[0055] Selective functionalization can be accomplished by halogenating, e.g., chlorinating or brominating the unsaturated α-olefin polymer to about 1 to 8 mass %, preferably 3 to 7 mass % chlorine, or bromine, based on the weight of polymer or hydrocarbon, by passing the chlorine or bromine through the polymer at a temperature of 60 to 250°C, preferably 110 to 160°C, e.g., 120 to 140°C, for about 0.5 to 10, preferably 1 to 7 hours. The halogenated polymer or hydrocarbon (hereinafter backbone) is then reacted with sufficient monounsaturated reactant capable of adding the required number of functional moieties to the backbone, e.g., monounsaturated carboxylic reactant, at 100 to 250°C, usually about 180°C to 235°C, for about 0.5 to 10, e.g., 3 to 8 hours, such that the product obtained will contain the desired number of moles of the monounsaturated carboxylic reactant per mole of the halogenated backbones. Alternatively, the backbone and the monounsaturated carboxylic reactant are mixed and heated while adding chlorine to the hot material.

[0056] While chlorination normally helps increase the reactivity of starting olefin polymers with monounsaturated functionalizing reactant, it is not necessary with some of the polymers or hydrocarbons contemplated for use in the present invention, particularly those preferred polymers or hydrocarbons which possess a high terminal bond content and reactivity. Preferably, therefore, the backbone and the monounsaturated functionality reactant, e.g., carboxylic reactant, are contacted at elevated temperature to cause an initial thermal "ene" reaction to take place. Ene reactions are known.

[0057] The hydrocarbon or polymer backbone can be functionalized by random attachment of functional moieties along the polymer chains by a variety of methods. For example, the polymer, in solution or in solid form, may be grafted with the monounsaturated carboxylic reactant, as described above, in the presence of a free-radical initiator. When performed in solution, the grafting takes place at an elevated temperature in the range of about 100 to 260°C, preferably 120 to 240°C. Preferably, free-radical initiated grafting would be accomplished in a mineral lubricating oil solution containing, e.g., 1 to 50 mass %, preferably 5 to 30 mass % polymer based on the initial total oil solution.

[0058] The free-radical initiators that may be used are peroxides, hydroperoxides, and azo compounds, preferably those that have a boiling point greater than about 100°C and decompose thermally within the grafting temperature range to provide free-radicals. Representative of these free-radical initiators are azobutyronitrile, 2,5-dimethylhex-3-ene-2, 5-bis-tertiary-butyl peroxide and dicumene peroxide. The initiator, when used, typically is used in an amount of between 0.005% and 1% by weight based on the weight of the reaction mixture solution. Typically, the aforesaid monounsaturated carboxylic reactant material and free-radical initiator are used in a weight ratio range of from about 1.0:1 to 30:1, preferably 3:1 to 6:1. The grafting is preferably carried out in an inert atmosphere, such as under nitrogen blanketing. The resulting grafted polymer is characterized by having carboxylic acid (or derivative) moieties randomly attached along the polymer chains: it being understood, of course, that some of the polymer chains remain ungrafted. The free radical grafting described above can be used for the other polymers and hydrocarbons of the present invention.

[0059] The preferred monounsaturated reactants that are used to functionalize the backbone comprise mono- and dicarboxylic acid material, i.e., acid, or acid derivative material, including (i) monounsaturated C₄ to C₁₀ dicarboxylic acid wherein (a) the carboxyl groups are vicinyl, (i.e., located on adjacent carbon atoms) and (b) at least one, preferably both, of said adjacent carbon atoms are part of said mono unsaturation; (ii) derivatives of (i) such as anhydrides; and (iii) monounsaturated C₃ to C₁₀ monocarboxylic acid wherein the carbon-carbon double bond is conjugated with the carboxy group, i.e., of the structure -C=C-CO-. Mixtures of monounsaturated carboxylic materials (i) - (iv) also may be used. Upon reaction with the backbone, the monounsaturation of the monounsaturated carboxylic reactant becomes saturated. Thus, for example, maleic anhydride becomes backbone-substituted succinic anhydride, and acrylic acid becomes backbone-substituted propionic acid. Exemplary of such monounsaturated carboxylic reactants are fumaric acid, itaconic acid, maleic acid, maleic anhydride, chloromaleic acid, chloromaleic anhydride, acrylic acid, methacrylic acid, crotonic acid and cinnamic acid.

[0060] To provide the required functionality, the monounsaturated carboxylic reactant, preferably maleic anhydride, typically will be used in an amount ranging from about equimolar amount to about 100 mass % excess, preferably 5 to 50 mass % excess, based on the moles of polymer or hydrocarbon. Unreacted excess monounsaturated carboxylic reactant can be removed from the final dispersant product by, for example, stripping, usually under vacuum, if required.

[0061] The treat rate of additives (A) and (B) contained in the lubricating oil composition is in the range of 2, preferably 2.5, to 20, more preferably 5 to 18, mass %.

CO-ADDITIVES

[0062] The lubricating oil composition of the invention may comprise further additives, different from and additional to (A) and (B). Such additional additives may, for example include ashless dispursants, other metal detergents, anti-wear agents such as zinc dihydrocarbyl dithiophosphates, anti-oxidants and demulsifiers.

[0063] It may be desirable, although not essential, to prepare one or more additive packages or concentrates comprising the additives, whereby additives (A) and (B) can be added simultaneously to the base oil to form the lubricating oil composition. Dissolution of the additive package(s) into the lubricating oil may be facilitated by solvents and by mixing accompanied with mild heating, but this is not essential. The additive package(s) will typically be formulated to contain the additive(s) in proper amounts to provide the desired concentration, and/or to carry out the intended function in the final formulation when the additive package(s) is/are combined with a predetermined amount of base lubricant. Thus, additives (A) and (B), in accordance with the present invention, may be admixed with small amounts of base oil or other compatible solvents together with other desirable additives to form additive packages containing active ingredients in an amount, based on the additive package, of, for example, from 2.5 to 90, preferably from 5 to 75, most preferably from 8 to 60, mass % of additives in the appropriate proportions, the remainder being base oil.

[0064] The final formulations as a trunk piston engine oil may typically contain 30, preferably 10 to 28, more preferably 12 to 24, mass % of the additive package(s), the remainder being base oil. Preferably, the trunk piston engine oil has a compositional TBN (using ASTM D2896) of 20 to 60, such as 25 to 55.

EXAMPLES

[0065] The present invention is illustrated by but in no way limited to the following examples.

COMPONENTS

[0066] The following components were used:

Component (A):

(A1) a calcium salicylate detergent having a TBN of 350 (basicity index of two or greater; a degree of carbonation of 80% or greater)

(A2) a calcium salicylate detergent having a TBN of 225 (basicity index of two or greater; a degree of carbonation of less than 80%)

(A3) a calcium salicylate detergent having a TBN of 65 (basicity index of less than two; a degree of carbonation of less than 80%)

Component (B):

(B1) oleic acid

(B2) polyisobutene succinic acid derived from a polyisobutene having a number average weight of 450

(B3) a polyisobutene succinic anhydride ("PIBSA") derived from a polyisobutene of number average molecular weight 950 (72% ai)

(B4) polyisobutene succinic anhydride ("PIBSA") derived from polyisobutene having a number average molecular weight of 450 (75% ai)

(B5) iso-octadecyl succinic anhydride

(B6) bis (2-hydroxypropyl) 2-dodecyl succinate

(B7) oleamide

(B8) tetraethylenepentamine, di-iso-octadecyl amide.

Base oil I:	an API Group I base oil known as XOMAPE600
Base oil II:	an API Group II base oil known as CHEV600R
HFO:	a heavy fuel oil, ISO-F-RMK 380
Phenate:	a calcium phenate detergent having a TBN of 255
Sulfonate:	a calcium sulfonate detergent having a TBN of 425

LUBRICANTS

[0067] Selections of the above components were blended to give a range of trunk piston marine engine lubricants. Some of the lubricants are examples of the invention; others are reference examples for comparison purposes. The compositions of the lubricants tested when each contained HFO are shown in the tables below under the "Results" heading.

TESTING

Panel Coker Test

[0068] The Panel Coker test was used to evaluate the performance of test lubricants. The test method involved splashing the oil under test onto a heated metal plate by spinning a metal comb-like device within a sump containing the oil. At the end of the test period, deposits formed may be assessed by weight and by visual inspection of the plate's appearance.

[0069] The testing was performed using a panel coker tester, model PK-S, supplied by the Yoshida Kagaku Kikai Co., of Osaka, Japan. Test panels were thoroughly cleaned and then weighed before inserting them into the apparatus. The test oil was mixed with 2.5% HFO and 225g of the resulting mixture added to the sump of the apparatus. When the temperature of the oil was at 100°C and the test plate at 320°C, a metal comb device was automatically rotated causing the oil to be splashed onto the test plate.

[0070] The test sequence lasted for 120 cycles, each cycle consisting of 15 seconds in which the oil was splashed onto the plate and 45 seconds without splashing.

[0071] At the end of test, the plate was washed with n-heptane, dried, reweighed and visually examined. The deposit weight was reported.

Light Scattering

[0072] Test lubricants were also evaluated for asphaltene dispersancy using light scattering according to the Focused Beam Reflectance Method ("FBRM"), which predicts asphaltene agglomeration and hence 'black sludge' formation.

[0073] The FBRM test method was disclosed at the 7th International Symposium on Marine Engineering, Tokyo, 24th - 28th October 2005, and was published in 'The Benefits of Salicylate Detergents in TPEO Applications with a Variety of Base Stocks', in the Conference Proceedings. Further details were disclosed at the CIMAC Congress, Vienna, 21st -24th May 2007 and published in "Meeting the Challenge of New Base Fluids for the Lubrication of Medium Speed Marine Engines - An Additive Approach" in the Congress Proceedings. In the latter paper it is disclosed that by using the FBRM method it is possible to obtain quantitative results for asphaltene dispersancy that predict performance for lubricant systems based on basestocks containing greater than or less than 90% saturates, and greater than or less than 0.03% sulphur. The predictions of relative performance obtained from FBRM were confirmed by engine tests in marine diesel engines.

[0074] The FBRM probe contains fibre optic cables through which laser light travels to reach the probe tip. At the tip, an optic focuses the laser light to a small spot. The optic is rotated so that the focussed beam scans a circular path between the window of the probe and the sample. As particles flow past the window they intersect the scanning path, giving backscattered light from the individual particles.

[0075] The scanning laser beam travels much faster than the particles; this means that the particles are effectively stationary. As the focussed beam reaches one edge of the particle there is an increase in the amount of backscattered light; the amount will decrease when the focussed beam reaches the other edge of the particle.

[0076] The instrument measures the time of the increased backscatter. The time period of backscatter from one particle is multiplied by the scan speed and the result is a distance or chord length. A chord length is a straight line between any two points on the edge of a particle. This is represented as a chord length distribution, a graph of numbers of chord lengths (particles) measured as a function of the chord length dimensions in microns. As the measurements are performed in real time the statistics of a distribution can be calculated and tracked. FBRM typically measures tens of thousands of chords per second, resulting in a robust number-by-chord length distribution. The method gives an absolute measure of the particle size distribution of the asphaltene particles.

[0077] The Focused beam Reflectance Probe (FBRM), model Lasentec D600L, was supplied by Mettler Toledo, Leicester, UK. The instrument was used in a configuration to give a particle size resolution of 1 µm to 1mm. Data from FBRM can be presented in several ways. Studies have suggested that the average counts per second can be used as a quantitative determination of asphaltene dispersancy. This value is a function of both the average size and level of agglomerate. In this application, the average count rate (over the entire size range) was monitored using a measurement time of 1 second per sample.

[0078] The test lubricant formulations were heated to 60°C and stirred at 400rpm; when the temperature reached 60°C the FBRM probe was inserted into the sample and measurements made for 15 minutes. An aliquot of heavy fuel oil (10% w/w) was introduced into the lubricant formulation under stirring using a four blade stirrer (at 400 rpm). A value for the average counts per second was taken when the count rate had reached an equilibrium value (typically overnight).

RESULTS

Panel Coker Test

[0079] The results of the Panel Coker tests are summarized in the tables below where figures are mass % of active ingredient unless otherwise stated.

TABLE 1

Ex	Ca salicylate (A1)	PIBSA (B3)	Base oil I	Base oil II	Deposits (g)
1	8.57	7.00	-	84.43	0.0221
X	8.57	-		91.43	0.0759
Y	8.57	-	91.43		0.0450

[0080] Each lubricant contained 44.6 mM of soap and had a TBN of 30. Also, each lubricant contained 0.5 mass % HFO.

[0081] The results show that the example of the invention (Ex 1) gave rise to much lower deposits, i.e. improved asphaltene dispersency, than a corresponding example lacking PIBSA (Ex X) and also than an example in a Group I base oil lacking PIBSA (Ex Y).

TABLE 2

Ex	Ca phenate	Ca sulfonate	PIBSA (B3)	Base oil II	Deposits (g)
P	4.40	4.40	7.00	84.20	0.1489
Q	4.40	4.40	-	91.20	0.1009

[0082] Each lubricant contained 42 mM of soap and had a TBN of 30. Also, each lubricant contained 0.5 mass % HFO.

[0083] The results show that the presence of PIBSA (Ex P) diminishes the asphaltene handling performance when the detergent is a phenate/sulfonate combination. This contrasts with the finding of TABLE 1 that, when the detergent is a salicylate, the performance is improved.

Light Scattering

[0084] Results of the FBRM tests are summarised in TABLE 3 below.

TABLE 3

Ex	Ca salicylate (A1) (mass % a.i.)	Component (B) (2.6 mass % a.i.)	Particle count/s
Ref	2.6	-	1,128
	-	B 1	4,777
	2.6	B1	175
	-	B2	3,944
	2.6	B2	486
	-	B3	3,763
	2.6	B3	168
	-	B4	5,640
	2.6	B4	167
	-	B5	5,073
	2.6	B5	240
	-	B6	6,559
	2.6	B6	363
	-	B7	16,523
	2.6	B7	859
	-	B8	2,110
	2.6	B8	294

[0085] The results show that, in all cases, (A) plus (B) is better than (A) alone.

[0086] Further results of FBRM, carried out separately from those of TABLE 3 in a recalibrated instrument, are summarised in TABLE 4 below.

TABLE 4

Ex	Ca Salicylate (A) (mass % a.i.)	Component (B3) (mass % a.i.)	Particle count/s
Ref	-	2.6	13,710
	A1 (2.6)	-	15,888
	A1 (2.6)	2.6	4,355
Ref	-	2.1	15,191
	A2 (2.1)	-	8,782
	A2 (2.1)	2.1	6,149
	A2 (2.1)	2.6	3,438
Ref	-	1.8	15,564
	A3 (1.8)	-	10,748
	A3 (1.8)	1.8	5,803
	A3 (1.8)	2.6	3,629

[0087] The results show that (A), represented by each of A1, A2 and A3, in combination with (B3) is better than (A) alone and better than (B3) alone.

Claims

1. A trunk piston marine engine lubricating oil composition for improving asphaltene handling in use thereof, in operation of the engine when fuelled by a heavy fuel oil, which composition comprises or is made by admixing an oil of lubricating viscosity, in a major amount, containing 50 mass % or more of a Group II basestock, and, in respective minor amounts:

(A) an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent having:

(A1) a basicity index of two or greater and a degree of carbonation of 80% or greater; or

(A2) a basicity index of two or greater and a degree of carbonation of less than 80%; or

(A3) a basicity index of less than two and a degree of carbonation of less than 80%;

where degree of carbonation is the percentage of carbonate present in the overbased metal hydrocarbyl-substituted hydroxybenzoate detergent expressed as a mole percentage relative to the total excess base in the detergent; and

(B) a hydrocarbyl-substituted carboxylic acid or anhydride thereof, wherein the or at least one hydrocarbyl group contains at least eight carbon atoms; the acid or anhydride constituting at least 1 and up to 10 mass % of the lubricating oil composition;

wherein the treat rate of additives (A) and (B) contained in the lubricating oil composition is in the range of 2 to 20 mass %.

2. The composition as claimed in claim 1 wherein the metal in (A) is calcium.

3. The composition as claimed in any of claims 1 or 2 wherein the hydrocarbyl-substituted hydroxybenzoate in (A) is a salicylate.

4. The composition as claimed in any one of claims 1 to 3 wherein the oil of lubricating viscosity contains more than 60 mass % of a Group II basestock.

5. The composition as claimed in any of the claims 1 to 4 wherein the hydrocarbyl group in (B) has from 8 to 400, such as 12 to 100, especially 16 to 64, carbon atoms.

6. The composition as claimed in any of claims 1 to 5 wherein, in the acid or derivative (B), the hydrocarbyl substituent is derived from a polyolefin.

7. The composition as claimed in any of claims 1 to 6 wherein (B) is a succinic acid or a succinic anhydride.

8. The composition as claimed in claim 7 wherein (B) is a polyisobutene succinic acid or anhydride.

9. The composition as claimed in any of claims 1 to 8 having a TBN of 20 to 60, such as 25 to 55.

10. The use of a detergent (A) as defined in claim 1 in combination with a carboxylic acid, or anhydride (B) as defined in any one of the preceding claims, and in the amount stated in claim 1, in a trunk piston marine lubricating oil composition for a medium-speed compression-ignited marine engine, which composition comprises an oil of lubricating viscosity in a major amount and contains 50 mass % or more of a Group II basestock, to improve asphaltene handling during operation of the engine, fueled by a heavy fuel oil, and its lubrication by the composition, in comparison with analogous operation when the same amount of detergent (A) is used in the absence of (B).

11. A method of operating a trunk piston medium-speed compression-ignited marine engine comprising

(i) fueling the engine with a heavy fuel oil; and

(ii) lubricating the crankcase of the engine with a composition as defined in any of claims 1 to 9.

12. A method of dispersing asphaltenes in a trunk piston marine lubricating oil composition during its lubrication of surfaces of the combustion chamber of a medium-speed compression-ignited marine engine and operation of the engine, which method comprises

(i) providing a composition as defined in any of claims 1 to 9:

(ii) providing the composition in the combustion chamber;

(iii) providing heavy fuel oil in the combustion chamber; and

(iv) combusting the heavy fuel oil in the combustion chamber.

Ansprüche

1. Tauchkolbenschiffsmotor-Schmierölzusammensetzung zur Verbesserung der Handhabung von Asphaltenen bei deren Verwendung beim Betrieb des Motors, wenn dieser mit schwerem Brennstofföl betrieben wird, welche Zusammensetzung umfasst oder hergestellt ist durch Mischen von Öl mit Schmierviskosität, in einer größeren Menge, das 50 Masse-% oder mehr von Basismaterial aus Gruppe II enthält und, in jeweils kleineren Mengen:

(A) Detergens aus überbasischem mit Kohlenwasserstoff substituierten Metallhydroxybenzoat, das:

(A1) einen Basizitätsindex von 2 oder größer und einen Carbonatgrad von 80% oder größer, oder

(A2) einen Basizitätsindex von 2 oder größer und einen Carbonatgrad von weniger als 80%, oder

(A3) einen Basizitätsindex von weniger als 2 und einen Carbonatgrad von weniger als 80% aufweist,

wobei der Carbonatgrad der Prozentsatz an Carbonat ist, der in dem Detergens aus überbasischem mit Kohlenwasserstoff substituierten Metallhydroxybenzoat vorliegt, ausgedrückt als Mol.-Prozentsatz bezogen auf die gesamte Überschussbase in dem Detergens, und

(B) mit Kohlenwasserstoff substituierte Carbonsäure oder ein Anhydrid davon, wobei die oder die mindestens eine Kohlenwasserstoffgruppe mindestens 8 Kohlenstoffatome enthält, die Säure oder das Anhydrid mindestens 1 und bis zu 10 Masse-% der Schmierölzusammensetzung ausmacht,

wobei die Einsatzkonzentration der Additive (A) und (B), die in der Schmierölzusammensetzung enthalten sind, im Bereich von 2 bis 20 Masse-% liegt.

2. Zusammensetzung wie in Anspruch 1 beansprucht, in der das Metall in (A) Calcium ist.

3. Zusammensetzung wie in einem der Ansprüche 1 oder 2 beansprucht, in der das mit Kohlenwasserstoff substituierte Hydroxybenzoat in (A) ein Salicylat ist.

4. Zusammensetzung wie in einem der Ansprüche 1 bis 3 beanprucht, in der das Öl mit Schmierviskosität mehr als 60 Masse-% Basismaterial aus Gruppe II umfasst.

5. Zusammensetzung wie in einem der Ansprüche 1 bis 4 beansprucht, in der die Kohlenwasserstoffgruppe in (B) von 8 bis 400, wie 12 bis 100, insbesondere 16 bis 64, Kohlenstoffatome aufweist.

6. Zusammensetzung wie in einem der Ansprüche 1 bis 5 beansprucht, in der der Kohlenwasserstoffsubstituent in der Säure oder in dem Derivat (B) von einem Polyolefin abgeleistet ist.

7. Zusammensetzung wie in einem der Ansprüche 1 bis 6 beansprucht, in der (B) eine Bernsteinsäure oder ein Bernsteinsäureanhyrid ist.

8. Zusammensetzung wie in Anspruch 7 beansprucht, in der (B) eine Polyisobutenbernsteinsäure oder -anhydrid ist.

9. Zusammensetzung wie in einem der Ansprüche 1 bis 8 beansprucht, die eine TBN (Gesamtbasenzahl) von 20 bis 60 aufweist, wie 25 bis 55.

10. Die Verwendung eines Detergens (A) wie in Anspruch 1 definiert in Kombination mit Carbonsäure oder Anhydrid (B) wie in einem der vorhergehenden Ansprüche definiert und in der Menge wie in Anspruch 1 angegeben, in einer Tauchkolbenschiffsmotor-Schmierölzusammensetzung für einen kompressionsgezündeten Schiffsmotor mit mittlerer Drehzahl, welche Zusammensetzung in einer größeren Menge Öl mit Schmierviskosität umfasst und 50 Masse-% oder mehr Basismaterial aus Gruppe II enthält, um die Asphaltenhandhabung während des Betriebs des Motors zu verbessern, der mit einem schweren Brennstofföl betrieben wird, und seine Schmierung durch die Zusammensetzung im Vergleich mit analogem Betrieb, wenn die gleiche Menge an Detergens (A) in Abwesenheit von (B) verwendet wird.

11. Verfahren zum Betreiben eines kompressionsgezündeten Tauchkolbenschiffsmotors mit mittlerer Drehzahl, bei dem

(i) der Motor mit schwerem Brennstofföl betrieben wird und

(ii) das Kurbelgehäuse des Motors mit einer Zusammensetzung wie in einem der Ansprüche 1 bis 9 definiert, geschmiert wird.

12. Verfahren zum Dispergieren von Asphaltenen in einer Tauchkolbenschiffsmotor-Schmierölzusammensetzung während ihrer Schmierung der Oberflächen der Verbrennungskammer eines kompressionsgezündeten Schiffsmotors mit mittlerer Drehzahl und beim Betrieb des Motors, bei welchem Verfahren

(i) eine Zusammensetzung wie in einem der Ansprüche 1 bis 9 definiert zur Verfügung gestellt wird,

(ii) die Zusammensetzung in der Verbrennungskammer zur Verfügung gestellt wird,

(iii) schweres Brennstofföl in der Verbrennungskammer zur Verfügung gestellt wird, und

(iv) das schwere Brennstofföl in der Verbrennungskammer verbrannt wird.

Revendications

1. Composition d'huile lubrifiante pour moteurs marins à piston fourreau, pour améliorer la maîtrise des asphaltènes lors de son utilisation dans le fonctionnement du moteur lors de son alimentation avec un fuel-oil lourd, composition qui comprend, ou qui est préparée en mélangeant, une huile de viscosité propre à la lubrification, en une quantité dominante, contenant 50 % en masse ou plus d'une huile lubrifiante de base du Groupe II, et, en de petites quantités respectives :

(A) un détergent hydroxybenzoate à substituant hydrocarbyle métallique surbasique ayant :

(A1) un indice de basicité égal ou supérieur à deux et un degré de carbonatation égal ou supérieur à 80 % ; ou

(A2) un indice de basicité égal ou supérieur à deux et un degré de carbonatation inférieur à 80 % ; ou

(A3) un indice de basicité inférieur à deux et un degré de carbonatation inférieur à 80 % ;

le degré de carbonatation étant le pourcentage de carbonate présent dans le détergent hydroxybenzoate à substituant hydrocarbyle métallique surbasique exprimé en pourcentage molaire par rapport à l'excès total de base dans le détergent ; et

(B) un acide carboxylique à substituant hydrocarbyle ou son anhydride, dans lequel le ou au moins un groupe hydrocarbyle contient au moins huit atomes de carbone ; l'acide ou l'anhydride représentant au moins 1 et jusqu'à 10 % en masse de la composition d'huile lubrifiante ;

dans laquelle le taux de traitement d'additifs (A) et (B) présents dans la composition d'huile lubrifiante est compris dans l'intervalle de 2 à 20 % en masse.

2. Composition suivant la revendication 1, dans laquelle le métal en (A) est le calcium.

3. Composition suivant l'une quelconque des revendications 1 et 2, dans laquelle l'hydroxybenzoate à substituant hydrocarbyle en (A) est un salicylate.

4. Composition suivant l'une quelconque des revendications 1 à 3, dans laquelle l'huile de viscosité propre à la lubrification contient plus de 60 % en masse d'une huile lubrifiante de base du Groupe II.

5. Composition suivant l'une quelconque des revendications 1 à 4, dans laquelle le groupe hydrocarbyle en (B) a de 8 à 400, par exemple de 12 à 100, notamment de 16 à 64, atomes de carbone.

6. Composition suivant l'une quelconque des revendications 1 à 5, dans laquelle, dans l'acide ou le dérivé (B), le substituant hydrocarbyle est dérivé d'une polyoléfine.

7. Composition suivant l'une quelconque des revendications 1 à 6, dans laquelle (B) est un acide succinique ou un anhydride succinique.

8. Composition suivant la revendication 7, dans laquelle (B) est un acide ou un anhydride polyisobutène-succinique.

9. Composition suivant l'une quelconque des revendications 1 à 8, ayant un indice de basicité total (TBN) de 20 à 60, par exemple de 25 à 55.

10. Utilisation d'un détergent (A) tel que défini dans la revendication 1 en association avec un acide ou anhydride carboxylique (B) tel que défini dans l'une quelconque des revendications précédentes, et en la quantité indiquée dans la revendication 1, dans une composition d'huile lubrifiante pour moteurs marins à piston fourreau, pour un moteur marin à allumage par compression à vitesse moyenne, composition qui comprend une huile de viscosité propre à la lubrification en une quantité dominante et qui contient 50 % en masse ou plus d'une huile lubrifiante de base du Groupe II, pour améliorer la maîtrise des asphaltènes au cours du fonctionnement du moteur alimenté avec un fuel-oil lourd, et sa lubrification par la composition, comparativement à un fonctionnement analogue lorsque la même quantité de détergent (A) est utilisée en l'absence de (B).

11. Procédé pour faire fonctionner un moteur marin à piston fourreau à allumage par compression à vitesse moyenne, comprenant

(i) l'alimentation du moteur avec un fuel-oil lourd ; et

(ii) la lubrification du carter du moteur avec une composition telle que définie dans l'une quelconque des revendications 1 à 9.

12. Procédé pour disperser les asphaltènes dans une composition d'huile lubrifiante pour moteurs marins à piston fourreau au cours de la lubrification par cette composition des surfaces de la chambre de combustion d'un moteur marin à allumage par compression à vitesse moyenne et au cours du fonctionnement du moteur, procédé qui comprend

(i) la fourniture d'une composition telle que définie dans l'une quelconque des revendications 1 à 9 ;

(ii) la fourniture de la composition dans la chambre de combustion ;

(iii) la fourniture d'un fuel-oil lourd dans la chambre de combustion ; et

(iv) la combustion du fuel-oil lourd dans la chambre de combustion.