WO2003008522A1 - Internal combustion engine oil composition - Google Patents

Internal combustion engine oil composition Download PDF

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Publication number
WO2003008522A1
WO2003008522A1 PCT/JP2002/006689 JP0206689W WO03008522A1 WO 2003008522 A1 WO2003008522 A1 WO 2003008522A1 JP 0206689 W JP0206689 W JP 0206689W WO 03008522 A1 WO03008522 A1 WO 03008522A1
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group
mass
alkaline earth
earth metal
acid
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PCT/JP2002/006689
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French (fr)
Japanese (ja)
Inventor
Akira Yaguchi
Jinichi Igarashi
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Nippon Oil Corporation
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Publication of WO2003008522A1 publication Critical patent/WO2003008522A1/en

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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04Mixtures of base-materials and additives
    • C10M169/045Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution and non-macromolecular compounds
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2203/00Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/1006Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/003Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions used as base material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02Hydroxy compounds
    • C10M2207/023Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02Amines, e.g. polyalkylene polyamines; Quaternary amines
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/28Amides; Imides
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00Metal present as such or in compounds
    • C10N2010/04Groups 2 or 12
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01Physico-chemical properties
    • C10N2020/02Viscosity; Viscosity index
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01Physico-chemical properties
    • C10N2020/04Molecular weight; Molecular weight distribution
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/04Detergent property or dispersant property
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/54Fuel economy
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/25Internal-combustion engines

Definitions

  • the present invention relates to a lubricating oil composition for an internal combustion engine, and in particular, has two contradictory performances of maintaining cleanliness over a long period of time, thereby enabling a longer life, and having excellent fuel efficiency. And a lubricating oil composition for an internal combustion engine. .
  • Engine oils which are expected to have a long service life, must maintain their initial performance over a long period of time.Therefore, it has been formulated to incorporate many performance additives such as detergents and dispersants, antioxidants, and antiwear agents. I have. Therefore, even if a friction reducing agent is added for the purpose of low fuel consumption, the friction reducing effect is impaired, and the low fuel consumption performance becomes insufficient.
  • friction modifiers which are widely used in fuel-saving oils, especially organic molybdenum compounds, are very excellent in low friction, but have a problem in long-life performance in cleanliness because they tend to be the core of sludge generation. Was. Therefore, it has been difficult to develop a long-life engine oil with low fuel consumption performance technically, and there has been no shortage of it in the field of pumping.
  • the present invention not only has excellent cleanliness over a long period of time, but also has excellent fuel economy, and is capable of reducing waste oil and reducing carbon dioxide emissions. It is an object to provide a lubricating oil composition.
  • the present inventors have repeatedly studied to develop a lubricating oil composition for internal combustion engines that is excellent in cleanliness and low cost over a long period of time, and as a result, a specific additive is added at a specific ratio.
  • the inventors have found that the above problems can be solved by adding and combining them, and have completed the present invention.
  • the present invention provides (A) a base oil comprising mineral oil and Z or synthetic oil having a kinematic viscosity at 100 ° C. of 2 to 8 mm 2 Zs and a total aromatic content of 15% by mass or less, (B) 2 to 15% by weight of polybutyrsuccinic acid imide and / or a derivative thereof having a weight average molecular weight of at least 600, (C) phenolic and / or amine based on the total amount of the composition. 0.2 to 5 mass of ashless antioxidant. /.
  • the present invention provides the composition, wherein (F) at least one kind of alkaline earth metal-based cleaning agent selected from the group consisting of alkaline earth metal sulfonates, alkaline earth metal phenates and alkaline earth metal salicylates.
  • Internal combustion engine further containing an agent Lubricating oil composition.
  • the lubricating oil composition for an internal combustion engine of the present invention will be described in the order of the components.
  • the component (A) is a specific base oil composed of mineral oil and / or synthetic oil.
  • mineral oil specifically, lubricating oil fractions obtained by distilling crude oil under normal pressure and reduced pressure are subjected to solvent removal, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining.
  • solvent removal solvent extraction
  • hydrocracking solvent dewaxing
  • catalytic dewaxing hydrorefining
  • examples thereof include paraffinic or naphthenic oils and normal paraffins which are purified by appropriately combining purification treatments such as sulfuric acid washing and clay treatment.
  • Solvent refining and hydrorefining are generally used, but advanced hydrocracking processes that can reduce aromatics and GTLW ax (gas-to-liquid-wax) It is more preferable to use one manufactured by a simplified method.
  • the synthetic oils include poly- ⁇ -olefin (eg, 11-otaten oligomer, 1-decene oligomer, ethylene-propylene oligomer, etc.), poly ( ⁇ -olefin) hydride, isopten oligomer, isobutene Oligomer hydride, isoparaffin, anolequinolene benzene, anolequinolenaphdalene, and diester (e.g., ditridecyl glutarate, dioctyl adipate, diisodecyl adipate, ditridecyl adipate, dioctyl sebacate, etc.) Polyesters (such as trimethylolpropane caprylate, trimethylolpropanepanperargonate, trimethylolpropaneisostearate, etc .; Sanoe Ichito, Pentaerisuri Tono les esters such Pentaerisuri Tono les pel
  • the kinematic viscosity of the component ( ⁇ ) at 100 ° C. must be in the range of 2 to 8 mm 2 s, and the preferred range is 3 to 7111111 2 s. If the kinematic viscosity of the component (A) at 100 ° C is less than 2 mm 2 / s , the heat generated from the internal combustion engine will increase the evaporation loss of the base oil, which may increase the viscosity and adversely affect the exhaust gas. I don't like it. On the other hand, if the kinematic viscosity exceeds 8 mm 2 / s, power loss due to viscous drag And the fuel efficiency is poor, which is not preferable.
  • the aromatic content of the component (A) must be 15% by mass or less, and the preferred range is 10% by mass. / 0 or less, a particularly preferred range is 5 mass. / 0 or less. If the aromatic content of the component (A) exceeds 15% by mass, oxidative stability deteriorates, and excellent cleanliness cannot be maintained over a long period of time.
  • the total aromatic content means the content of an aromatic fraction measured in accordance with the method specified in ASTM D2549.
  • the range in and total aromatic content of kinematic viscosity 2 ⁇ 8 mm 2 Z s at 100 ° C of the oil mixture is have you as long as more than 1 5% by weight
  • a base oil in which one of the mixed oils is out of this range for example, a base oil having a kinematic viscosity at 100 ° C of more than 8 mm 2 / s or an aromatic content of 15 mass.
  • Base oils exceeding / 0 can be used by being appropriately mixed.
  • the viscosity index of the component (A) is not particularly limited, but is preferably 110 or more, and particularly preferably 120 or more.
  • a base oil having a high viscosity index it is possible to obtain a composition having higher oxidation stability, excellent fuel economy, and excellent low-temperature viscosity characteristics.
  • the component (B) is a polybutenylsuccinic acid imide having a weight average molecular weight of 6500 or more and z or a derivative thereof.
  • Examples of the polybutyrsuccinic acid imid include a polybuteric succinic acid imid represented by the following general formula (1) or (2).
  • PIB represents a polybutene group, and is obtained by polymerizing a high-purity isobutene or a mixture of 1-butene and isobutene with a boron fluoride-based catalyst or with an aluminum chloride-based catalyst.
  • n is an integer of 2 to 5, preferably 3 or 4.
  • the polybutene is one in which a trace amount of fluorine and chlorine remaining due to the catalyst in the production process has been sufficiently removed by an appropriate method such as an adsorption method or a sufficient washing with water.
  • the content of halogen such as chlorine is preferably 50 mass: pm or less, more preferably 10 mass ppm or less, further preferably 5 mass ppm or less, and particularly preferably 1 mass ppm or less. .
  • the method for producing the succinic acid imid represented by the general formula (1) or (2) is not particularly limited.
  • chlorinated polybutene preferably polybutene from which chlorine and fluorine have been sufficiently removed
  • maleic anhydride at 100 to 200 ° C.
  • a method of reacting with boramine such as triethylenetetramine, tetraethylenepentamine, or pentaethylenehexamine, can be used.
  • boramine such as triethylenetetramine, tetraethylenepentamine, or pentaethylenehexamine
  • the polybutyrsuccinic acid may be reacted twice as much as the polyamine (molar ratio).
  • the polybutenyl succinic acid may be reacted with the polybutenyl succinic acid.
  • Succinic acid and polyamine may be reacted in equal amounts (molar ratio).
  • polybuturbis succinic acid imide is preferred because excellent sludge dispersibility can be obtained.
  • the polybutyrsuccinic acid imide derivative includes, for example, a boron compound and an oxygen-containing organic compound in addition to the compound represented by the general formula (1) or (2).
  • Compounds that act to neutralize or amidate some or all of the remaining amino and / or Z or imino groups include, for example, a boron compound and an oxygen-containing organic compound in addition to the compound represented by the general formula (1) or (2).
  • Examples of the boron compound that acts on the compound of the general formula (1) or (2) include boric acid, borates, and borate esters.
  • Specific examples of boric acid include orthoboric acid, metaboric acid, and tetraboric acid.
  • Examples of the borate include alkali metal salts, alkaline earth metal salts and ammonium salts of boric acid, and more specifically, for example, lithium metaborate, lithium tetraborate, lithium pentaborate, perborate Lithium borate such as lithium phosphate; sodium metaborate, sodium diborate, sodium tetraborate, sodium pentaborate, sodium hexaborate Sodium borate such as sodium octaborate; potassium metaborate, potassium tetraborate, potassium pentaborate, potassium hexaborate, potassium octaborate, etc .; potassium metaborate, calcium metaborate, diborate Calcium borate such as calcium, tricalcium tetraborate, pentacalcium
  • borate ester examples include an ester of boric acid and preferably an aliphatic alcohol having 1 to 6 carbon atoms. More specifically, for example, monomethyl borate, dimethyl borate, trimethyl borate, Monoethyl borate, getyl borate, triethyl borate, monopropyl borate pill, dipropyl borate, tripropyl borate, monobutyl borate, dibutyl borate, triptyl borate and the like.
  • the succinic acid imido derivative treated with the above boron compound is preferably used because of its excellent heat resistance and oxidation stability.
  • oxygen-containing organic compound acting on the compound of the general formula (1) or (2) include, for example, formic acid, acetic acid, glycolic acid, propionic acid, lactic acid, butyric acid, valeric acid, caproic acid, Enanthic acid, caprylic acid, pelargonic acid, capric acid, pendecylic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, oleic acid, nonadecanoic acid, eicosanoic acid, etc.
  • an oxygen-containing organic compound By causing such an oxygen-containing organic compound to act, for example, when a part or all of the amino group or imino group in the compound of the general formula (1) or (2) has a structure represented by the following general formula (3) Presumed.
  • R 1 R is a hydrogen atom, an alkyl group having 1-2 4 carbon atoms, an alkenyl group, alkoxycarbonyl Alkoxy group, or one 0_ (R 2 0) shows the human Dorokishi (poly) Okishiarukire emissions group represented by m H, R 2 is an alkylene group having 1 to 4 carbon atoms, m is an integer of 1 to 5 Shown.
  • polypulpisuccinic imide containing as a main component a compound obtained by acting these oxygen-containing organic compounds on all of the amino or imino groups is preferably used because of its excellent sludge dispersibility.
  • a compound can be obtained, for example, by reacting (n-1) mol of an oxygen-containing organic compound with 1 mol of the compound of the formula (1).
  • the succinic acid imid derivative treated with such an oxygen-containing organic compound is excellent in sludge dispersibility, and is preferably a compound treated with hydroxy (poly) oxyalkylene carbonate.
  • any one selected from the above-mentioned polybutenylsuccinic acid imides and / or derivatives thereof can be used, and the weight average molecular weight is 6500 or more, It is preferably at least 7000, more preferably at least 8000, particularly preferably at least 9000.
  • the weight average molecular weight is less than 6500, the molecular weight of the non-polar polybutul group is small and the dispersibility of sludge is poor, and the amine portion of the polar group, which may be an active site for oxidation deterioration, becomes relatively large. As a result, the oxidation stability is inferior, so that the excellent effect of extending the life as in the present invention cannot be obtained.
  • the upper limit of the weight average molecular weight of the component (B) is not particularly limited, but is preferably 20,000 or less, particularly preferably 15,000 or less, from the viewpoint of preventing the deterioration of the low-temperature viscosity characteristics.
  • the weight-average molecular weight used here refers to a 150-C ALCZG PC system from Waters and two series of GMHHR-M (7.8 mm IDX 30 cm) manufactured by Tosoh Corporation in series. Means tetrahydrofuran, temperature 23 ° C, flow rate lmLZ, sample concentration 1 mass%, sample injection amount 75 / xL, weight average molecular weight in terms of polystyrene measured with a detector differential refractometer (RI). .
  • the lower limit of the content of the component (B) in the present invention is 2% by mass>, preferably 3% by mass, based on the total amount of the composition, while the upper limit is 15% by mass, preferably 10% by mass. It is.
  • the component (C) is a phenolic and / or amine ashless antioxidant.
  • phenolic ashless antioxidants examples include, for example, 4,4′-methylenebis (2,6-di-tert-butylphenol), 4,4′-bis (2,6-g-tert-butyl) Phenol), 4,4'-bis (2-methynole 6-tert-butylinolephenol), 2,2'-methylenebis (4-ethyl-6-tert-ptinolephenole), 2,2'-methylenebis (4-methyltinole) 6-tert-butylinophenol, 4,4, butylidenebis (3-methynole 6-tert-butyl / lephenol), 4,4'-isopropylidenebis (2,6-di-tert-butylenophenol) , 2,2, -methylenebis (4-methynole-6-noenophenol), 2,2'-isobutylidenebis (4,6-dimethylphenol), 2,2,1-methylenebis (4-methinolay 6-
  • phenolic compounds having a molecular weight of 240 or more are more preferably used because they have a high decomposition temperature and exhibit their effects even under higher temperature conditions.
  • examples of the amine-based ashless antioxidants include phenyl-naphthylamido. Phenol, phenolic phenol, a-naphthinoleamine, dianolequinolesiphenyl-lamine, N, N'-diphenyl-p-phenylenediamine and mixtures thereof.
  • examples of the alkyl group include a linear or branched alkyl group having 1 to 20 carbon atoms.
  • the lower limit of the content of the component (C) in the present invention is 0.2% by mass / 0 , preferably 0.3% by mass, particularly preferably 0.4 '% by mass, based on the total amount of the composition.
  • the upper limit is 5% by mass, preferably 2.5% by mass, particularly preferably 2.0% by mass. Its content is 0.2 mass. /.
  • the amount is less than 5%, the composition of the present invention cannot maintain excellent cleanliness for a long period of time.
  • the content exceeds 5% by mass, the storage stability of the composition deteriorates. Each is not preferred.
  • the component (C) 0.4 to 2% by mass of a phenol-based ashless antioxidant and 0.4 to 2% by mass of an amine-based ashless antioxidant based on the total amount of the composition. It is particularly preferable to use the amine antioxidant in an amount of 1 to 2% by mass, so that excellent cleanliness can be maintained over a long period of time.
  • Examples of the viscosity index improver of the component (D) include non-dispersion type or dispersion type viscosity index improvers.
  • non-dispersion type viscosity index improver examples include one or more monomers (D) selected from compounds represented by the following general formulas (4), (5) and (6). — The copolymer of 1) or a hydride thereof can be exemplified.
  • the dispersion type viscosity index improver specifically, a copolymer of two or more monomers selected from the compounds represented by the following general formulas (7) and (8) or a hydride thereof is used.
  • R 11 represents a hydrogen atom or a methyl group
  • R 12 represents an alkyl group having 1 to 18 carbon atoms.
  • Specific examples of the alkyl group having 1 to 18 carbon atoms for R 12 include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, and a nonyl group.
  • the alkyl groups may be linear or branched. ) Can be exemplified.
  • R 13 represents a hydrogen atom or a methyl group
  • R 14 represents a hydrocarbon group having 1 to 12 carbon atoms.
  • hydrocarbon group having 1 to 12 carbon atoms representing R 14 include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, and a Alkyl groups such as benzyl, decyl, pendecyl, and dodecyl groups (the alkyl groups may be straight-chain or branched); butyl, pentyl, hexyl, heptyl , Octayl, nonyl, decelle, pendenyl, dodecenyl and other alkenyl groups (the alkenyl groups may be linear or branched, and the position of the double bond is arbitrary.
  • a cycloalkyl group having 5 to 7 carbon atoms such as a cyclopentyl group, a cyclohexyl group, or a cycloheptyl group; a methylcyclopentyl group, a dimethinolecyclopentyl group, a methinoolethynolecyclopentyl group, a jeti Pentyl group at the mouth, Methylhexyl group at the mouth, Methylcyclohexyl group, Methylethylcyclohexyl group, Jetylcyclohexyl group, Heptyl group at the Methyl mouth, Heptinole group at the Dimethinoresic mouth, Heptinole at the Methinoleetinole mouth Alkylcycloalkyl groups having 6 to 11 carbon atoms, such as acetyl, acetyl and heptyl groups (the substitution positions of these alkyl groups
  • R—C—CH CH—CR W
  • R 15 and R 16 are each independently a hydrogen atom, an alkoxy group having 1 to 18 carbon atoms (one OR 17 : R 17 is a carbon atom
  • R 17 is a carbon atom
  • Examples of the alkyl group having 1 to 18 carbon atoms include the same alkyl groups as those represented by R 12 in the formula (4).
  • R 19 represents a hydrogen atom or a methyl group
  • R 2 G represents an alkylene group having 1 to 18 carbon atoms
  • X 1 represents one or two nitrogen atoms and an oxygen atom. It represents an amine residue or a heterocyclic residue containing 0 to 2 groups, and a is 0 or 1.
  • alkylene group having 1 to 18 carbon atoms that represents R 2 ° include an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a heptylene group, an otaylene group, a noylene group, a decylene group, Examples include pendecylene group, dodecylene group, tridecylene group, tetradecylene group, pentadecylene group, hexadecylene group, heptadecylene group, and octadecylene group (the alkylene groups may be linear or branched).
  • Specific examples of the group represented by X 1 include a dimethylamino group, a acetylamino group, a dipropylamino group, a dibutylamino group, a erino group, a toluidino group, a xylidino group, an acetylamino group, a benzoylamino group, a morpholino group, and a pyrrolyl group.
  • R 21 represents a hydrogen atom or a methyl group
  • X 2 represents a Amin residue or heterocyclic residue containing two 0 to 1 or 2 and oxygen atoms and nitrogen atoms c
  • the group represented by X 2 can be the same as the example of Amin residue or heterocyclic residue represented by X 1 in the formula (7).
  • Preferred examples of the monomer as the component (D-1) include alkyl acrylates having 1 to 18 carbon atoms, alkyl methacrylates having 1 to 18 carbon atoms, olefins having 2 to 20 carbon atoms, and styrene. Methionole styrene, maleic anhydride estenole, maleic anhydride amide, and mixtures thereof.
  • Preferred examples of the monomer as the component (D-2) include dimethylaminomethyl methacrylate, dimethylaminomethyl methacrylate, dimethylaminoethyl methacrylate, dimethylaminoethyl methacrylate, and dimethylaminoethyl methacrylate.
  • Examples thereof include _methyl-15-bipyridine, morpholinomethyl methacrylate, morpholinoethyl methacrylate, N-bulpyrrolidone, and mixtures thereof.
  • (D-1) When one or two or more monomers selected from the compounds are copolymerized with one or more monomers selected from the (D-1) compounds, the (D-1) —
  • the molar ratio between component (1) and component (D-2) is arbitrary, but is generally about 80:20 to 95: 5.
  • the reaction method for copolymerization is also optional, but it is usually easy to carry out copolymerization by subjecting component (D-1) and component (D-2) to a solution polymerization in the presence of a polymerization initiator such as benzoyl peroxide. Coalescence is obtained.
  • the weight average molecular weight of the viscosity index improver (D) is 400,000, preferably 600,000.
  • the upper limit is preferably 1,000,000, more preferably 900,000.
  • the content of the component (D) in the present invention depends on the SAE viscosity grade of the desired engine oil (specified by SAEJ300), but it is 0.1% based on the total amount of the composition.
  • 2 is 1 5 mass 0/0, preferably from 0.5 to 1 0 mass range 0/0.
  • the content is less than 0.2% by mass, the temporary decrease in viscosity in a shearing field is small, and does not contribute to lowering the friction of the engine. If the content exceeds 15% by mass, the cleanliness of the engine is adversely affected, which is not preferable.
  • Examples of the friction reducing agent as the component (E) in the present invention include, for example, those having 6 to 3 carbon atoms.
  • An amino compound, a fatty acid ester, a fatty acid amide, a metal salt of fatty acid pentaacid, or the like having a linear or branched, preferably linear hydrocarbon group of 0, or an organic molybdenum compound, or an arbitrary mixture thereof Is mentioned.
  • linear or branched hydrocarbon group having 6 to 30 carbon atoms include a hexyl group, a heptyl group, an octyl group, a noel group, a decyl group, a pendecyl group, a dodecyl group and a tridecyl group.
  • alkyl groups may be linear or branched; hexyl, hepte-nore, otatul, none-nore, deseninole, pendesenole, Dodecenyl group, tridecenyl group, tetradecel group, penta Senyl group, hexadeceyl group, heptadecenyl group, octadecenyl group, nonadecenyl group, icosulle group, heny cossenole group, docosenoline group, tricosenole group, tetracoseniole group, pentacosenyl group, heptacosenyl group, heptacosenyl group Alkacyl groups such as octacososel group, nonacosenyl group and triacontyl group (these alkaryl groups may be straight-chain or branched, and the
  • Examples of the amine compound include the above-mentioned aliphatic monoamine and aliphatic polyamine having a hydrocarbon group having 6 to 30 carbon atoms, and alkylene oxide adducts of these aliphatic amines.
  • Examples of the fatty acid ester include esters of the above fatty acid having a hydrocarbon group having 6 to 30 carbon atoms with an aliphatic monohydric alcohol or an aliphatic polyhydric alcohol.
  • the fatty acid amide the above-mentioned fatty acid having a hydrocarbon group having 6 to 30 carbon atoms, Examples thereof include amides with aliphatic monoamines or aliphatic polyamines.
  • the fatty acid metal salt include an alkaline earth metal salt (such as a magnesium salt and a calcium salt) and a zinc salt of the fatty acid having a hydrocarbon group having 6 to 30 carbon atoms.
  • fatty acid esters are preferable, and specific examples thereof include glycerin monoolate and sorbitan monoolate.
  • Examples of S include molybdenum dithiocarbamate compounds and molybdenum dithiophosphate. Molybdenum dithiocarbamate-based compounds having excellent oxidation stability and friction reducing effect are more preferable, and specific examples include those represented by the general formula (9).
  • R 3 1, R 3 2, R 3 3 and R 3 4 are each independently a hydrocarbon group (concretely, an alkyl group or an alkyl ⁇ reel with carbon number 2-1 8 ⁇ 3 and ⁇ 4 each independently represent S (sulfur atom) or ⁇ (oxygen atom).
  • the alkyl group includes a primary alkyl group, a secondary alkyl group or a tertiary alkyl group, and these may be linear or branched.
  • Preferable examples of the alkyl group include alkyl groups such as an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, a decyl group, a dodecyl group and a tridecyl group. Or may be branched).
  • Specific examples of preferable alkylaryl groups include alkylaryl groups such as a butylphenyl group and a nonylphenyl group (these alkyl groups may be linear or branched).
  • Preferred molybdenum dithiocarbamate compounds include, specifically, molybdenum sulfide getyl dithiocarbamate, molybdenum dipropyl dithiocarbamate, molybdenum dibutyl dithiocarbamate, molybdenum dipentyl dithiocarbamate, and molybdenum disulfide Xyldithiocarbamate, sulfurized Molybdenum dioctyl dicarbamate,
  • the content of the component (E) in the present invention is at least 0.05 mass%, preferably at least 0.1 mass%, particularly preferably at least 0.4 mass%, based on the total amount of the composition.
  • the content is 3% by mass / 0 or less, preferably 2.5% by mass or less, particularly preferably 2% by mass or less.
  • the content is less than 0.05% by mass, the effect of reducing friction cannot be sufficiently exerted, while the content is 3% by mass. /. If the ratio exceeds the above range, the oxidation stability will be reduced.
  • the lubricating oil composition for an internal combustion engine of the present invention further contains (F) an alkaline earth metal detergent.
  • the component (F) includes an alkaline earth metal sulfonate, an alkaline earth metal phenate and an alkaline earth metal salicylate.
  • at least one kind of alkaline earth metal detergent selected from the group consisting of these can be used.
  • the alkaline earth metal sulfonate is obtained by sulfonating an alkyl aromatic compound having a molecular weight of 300 to 150, preferably 400 to 700.
  • Alkali earth metal salts of alkyl aromatic sulfonic acids particularly magnesium salts and / or calcium salts, and calcium salts are preferably used.
  • alkyl aromatic sulfonic acid examples include so-called petroleum sulfonic acid and synthetic sulfonic acid.
  • the above-mentioned petroleum sulfonic acid generally, a so-called mahoga-monoacid or the like which is obtained by sulfonating an alkyl aromatic compound of a lubricating oil fraction of a mineral oil, which is by-produced during the production of white oil, is used.
  • the synthetic sulfonic acid include an alkyl having a linear or branched alkyl group, which is obtained as a by-product from, for example, an alkylbenzene production plant used as a raw material for a detergent or obtained by alkylating polyolefin into benzene.
  • a substance obtained by converting benzene to snorehon or a substance obtained by sulfonating anorequinolenaphthalene such as dinoninolenaphthalene is used.
  • the sulfonating agent used for sulfonating these alkyl aromatic compounds is not particularly limited, but fuming sulfuric acid or sulfuric anhydride is usually used.
  • Alkaline earth metal phenates include, for example, alkyl phenols, alkyl phenol sulphides, alkaline earth metal salts of Mannich reactants of alkyl phenols, especially magnesium salts and / or calcium salts. Specific examples include those represented by the following general formulas (10) to (12).
  • R 44 , R 45 and R 46 may be the same or different, and each represents a linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18; MM 2 and M 3 are Each represents an alkaline earth metal, preferably calcium and / or magnesium, and X represents 1 or 2.
  • alkyl group represented by R 41 , R 42 , R 43 , R 44 , R 45 and R 46 examples include a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, and a nonyl group.
  • alkaline earth metal salicylate examples include alkali earth metal salts of arylalkyl salicylic acid, particularly, magnesium salt and Z or calcium salt. Specific examples include those represented by the following general formula (13).
  • R 47 represents a linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms, and M 4 represents an alkaline earth metal, preferably calcium and / or calcium. Or shows magnetism.
  • alkyl group represented by R 47 examples include a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a pendecyl group, a dodecyl group, a tridecyl group, and a tetradecyl group.
  • the alkaline earth metal sulfonates, alkaline earth metal phenates and alkaline earth metal salicylates include the above-mentioned alkyl aromatic sulfonic acids, alkylphenols, phenols, and phenols.
  • the above-mentioned neutral alkaline earth metal salts, basic alkaline earth metal salts, overbased (ultrabasic) alkaline earth metal salts, and mixtures thereof can be used.
  • Superbasic calcium salicylate is particularly preferred because of its excellent fuel efficiency and oxidation stability.
  • the metal-based detergent is usually commercially available in a diluted state with a light lubricating base oil or the like, and is available, but generally has a metal content of 1.0 to 20% by mass. better rather is used as of 2.0 to 1 6 mass 0/0.
  • the total base number of the alkaline earth metal detergent used in the present invention is optional, Those having a total base number of 50 O mg KOH / g or less, preferably 150 to 45 O mg KOH / g, are used.
  • the total base number means the total base number by the perchloric acid method, which is measured in accordance with JIS 2501 (1992), "Petroleum products and lubricating oils-Neutralization number test method 7". I do.
  • the content of the alkaline earth metal detergent (F) in the present invention is usually 10% by mass or less based on the total amount of the composition, preferably 0.1 to 10% by mass, more preferably 0.1 to 10% by mass. It is 5 to 8% by mass, still more preferably 1 to 5% by mass.
  • the lubricating oil composition for an internal combustion engine according to the present invention is excellent in cleanliness and fuel economy over a long period of time as it is, but in order to further improve its performance, the lubricating oil is used in accordance with its purpose.
  • Any commonly used additive can be contained.
  • Such additives include, for example, ashless dispersants other than component (I), antiwear agents, antioxidants other than component (C), corrosion inhibitors, antioxidants, demulsifiers, metal deactivators. And additives such as an antifoaming agent and a coloring agent.
  • Examples of the ashless dispersant other than the component (II) include succinic acid imide having an alkyl group or an alkyl group having a weight average molecular weight of less than 600 and derivatives thereof, and alkyl having 40 to 400 carbon atoms. Or a benzylamine or a polyamine having an alkyl group or a derivative thereof. Examples of these derivatives include those obtained by allowing the above-mentioned boron-containing compound, the above-described oxygen-containing organic compound, or the like to act on the above-mentioned imido-dibenzylamine succinate, polyamine or the like.
  • antiwear agents include phosphoric acid esters, phosphites and their amine salts, zinc compounds such as zinc dialkyldithiophosphate, zinc dialkylthiophosphate, zinc dialkylphosphate, zinc dialkyldithiophosphate, disulfide and the like. , Sulfurized oils, sulfurized compounds such as sulfurized oils and the like, and arbitrary mixtures thereof.
  • antioxidant other than the component (C) examples include an alkyldithiocarbamate and the like.
  • corrosion inhibitor examples include benzotriazole-based, tolyltriazole-based, thiaziazole-based, and imidazole-based compounds.
  • protective agents include polyhydric alcohol esters, petroleum sulfonates, alkylbenzenesulfonates, dinonylnaphthalene sulfonates, and alkenyl succinates. And polyhydric alcohol esters.
  • demulsifiers include polyalkylene glycol-based nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl ether, and polyoxyethylene alkyl naphthyl ether.
  • metal deactivator examples include imidazoline, a pyrimidine derivative, an alkylthiazole, a mercaptobenzothiazole, a benzotriazole or a derivative thereof,
  • 1,3,4-thiadiazole polysulfide 1,3,4-thiadiazolyl 2,5-bisdianolecyldithiocarbamate
  • 2- (anolexidithio) benzimidazole 2- (anolexidithio) benzimidazole, mono (o-carboxybenzylthio) propione Tolyl and the like.
  • antifoaming agent examples include silicone, fluorosilicone, and fluoroalkyl ether.
  • the content thereof is usually based on the total amount of the composition, and the content of the ashless dispersant other than the component (B) is from 0.01 to 0.1%. 10% by mass, 0.1 to 5% by mass for antioxidants, corrosion inhibitors, antioxidants, and demulsifiers other than component (C), and 0.05% for metal deactivators. It is selected in the range of 5 to 1% by mass, and 0.0005 to 1% by mass for the antifoaming agent.
  • the lubricating oil composition for an internal combustion engine of the present invention can be preferably used as a lubricating oil for an internal combustion engine such as a gasoline engine, a diesel engine, a gas engine, etc. for motorcycles, automobiles, power generation, ships, etc.
  • Lubricating oils that require cleanliness and fuel efficiency over a long period of time such as lubricating oils for drive systems such as automatic or manual transmissions, wet brakes, hydraulic oils, and turn oils It can be suitably used.
  • the lubricating oil composition for an internal combustion engine of the present invention is excellent in low fuel consumption (fuel saving) performance, and also has the ability to maintain cleanliness for a longer time than conventional long-life oils. Therefore, by using the lubricating oil composition of the present invention, it is possible to reduce waste oil and carbon dioxide emissions. [Best Mode for Carrying Out the Invention]
  • lubricating oil compositions for internal combustion engines of the present invention (Examples 1 to 4) and compositions not satisfying the requirements of the present invention for comparison (Comparative Examples 1 to 7) were prepared.
  • the viscosity grades of these compositions were all 5 W-30 oils.
  • the sludge rating of the right side cover of the engine was evaluated every 50 hours in accordance with the automobile engine gasoline engine lubricating oil cleanliness test method specified in the Japan Society of Automotive Engineers Standards (JASO M3 31—91). The test was continued until the score fell below 9.0. In addition, this cleanliness test method usually evaluates the sludge score after 300 hours, and if it is 9.0 or more, it is judged as high grade engine oil. Therefore, the test time for the conventional long-life engine oil until the rating becomes 9.0 or less is about 300 to 400 hours. In the present invention, 500 hours or more was regarded as the required performance of the cleanliness evaluation.
  • the lubricating oil composition for an internal combustion engine of the present invention (Examples 1 to 4) has a long life of 300 to 400 hours. It excels in cleanliness over a long period of time, about twice or more compared to engine oil, and also has excellent fuel economy. In particular, when calcium salicylate is used as a metal-based detergent, more excellent maintainability of cleanliness and fuel economy are exhibited.
  • Comparative Example 1 when mineral oil having an aromatic content higher than the claimed range is used as the component (A) Comparative Example 1) is inferior in both maintainability of cleanliness and fuel efficiency. (B) When succinic acid imide having a weight average molecular weight smaller than the claimed range is used as the component (Comparative Example 2: equivalent to a conventional long-life engine oil), both of the cleanliness retention and the fuel economy are the same as those of the present invention. Inferior to composition. When Mo DTC was further added to the composition of Comparative Example 2 (Comparative Example 3), the fuel economy was improved but the maintainability of cleanliness was poor.
  • Alkyl diphenylamine (alkyl group is a mixture of C4 and G8), nitrogen content: 4.5% by mass
  • Dispersion type polymethacrylate weight average molecular weight: about 800,000
  • Dispersion type polymethacrylate weight average molecular weight: about 300,000

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Abstract

An internal combustion engine oil composition exhibiting detergent action over a long period and being excellent in fuel consumption performance, which comprises (A) a base oil consisting of a mineral and/or synthetic oil having a kinematic viscosity of 2 to 8 mm2/s at 100 °C and a total aromatic content of 15 % by mass or below, (B) 2 to 15 % by mass of polybutenyl- succinimide having a weight-average molecular weight of 6500 or above and/or a derivative thereof, (C) 0.2 to 5 % by mass of a phenol- and/or amine-type ashless antioxidant, (D) 0.2 to 15 % by mass of a viscosity index improver having a weight-average molecular weight of 400000 or above, and (E) 0.05 to 3 % by mass of a friction modifier, the percentages specified for the components (B) to (E) being based on the whole of the composition.

Description

明 細 書 内燃機関用潤滑油組成物  Description Lubricating oil composition for internal combustion engine
[技術分野] [Technical field]
本発明は、 内燃機関用潤滑油組成物に関し、 詳しくは長期間に渡り清浄性を維 持でき、 従って長寿命化が可能となり、 かつ優れた低燃費性を有するという相反 する二つの性能を兼ね備えた内燃機関用潤滑油組成物に関する。 .  The present invention relates to a lubricating oil composition for an internal combustion engine, and in particular, has two contradictory performances of maintaining cleanliness over a long period of time, thereby enabling a longer life, and having excellent fuel efficiency. And a lubricating oil composition for an internal combustion engine. .
[背景技術] [Background technology]
近年、 環境への配慮から廃棄物処理法の規制が厳しくなつて行く中で、 自動車 のエンジンから出るェンジン廃油の処理法についても全世界で問題となりつつあ る。 廃油を減らすためにはエンジン油の長寿命化が有効であるが、 エンジン油は エンジンからのブローバイガス中の窒素酸化物ガスにさらされており、 特に最近 はエンジンの高出力化及びェンジンのコンパクト化に伴うオイルパン容量の減少 等のため、 エンジン油に対する負担が大きくなつており、 特にディーゼルェンジ ンと比較して窒素酸化物の発生量の多いガソリンエンジンではオイルの劣化が著 しいことが知られている。  In recent years, as the regulations of the Waste Disposal Law have become stricter due to environmental considerations, the treatment of engine waste oil from automobile engines is becoming a global issue. To reduce waste oil, it is effective to extend the life of the engine oil.However, engine oil is exposed to nitrogen oxide gas in blow-by gas from the engine. The burden on engine oil is increasing due to the decrease in oil pan capacity accompanying the shift to gasoline, and it is known that oil degradation is particularly severe in gasoline engines that generate a large amount of nitrogen oxides compared to diesel engines. Have been.
エンジン油の長寿命化の手法としては、 酸化安定性に悪影響を与える成分、 例 えば、 芳香族分、 硫黄分、 塩基性窒素分等を十分除去した精製度の高い鉱油系基 油や全合成系基油を使用する事、 そして清浄性、 耐摩耗性を長期に維持するため に、 清浄分散剤、 酸化防止剤、 摩耗防止剤を多く配合することが有効であること が一般に知られてる。  To extend the service life of engine oil, components that adversely affect oxidative stability, such as highly refined mineral base oils from which aromatics, sulfur, basic nitrogen, etc. are sufficiently removed, or total synthesis It is generally known that it is effective to use many base dispersants, antioxidants, and antiwear agents to use base oils and to maintain cleanliness and abrasion resistance over a long period of time.
一方、 石油危機を契機に実施され始めた自動車の低燃費化 (省燃費化) は、 資 源保護及び環境保護の観点から今後も依然として重要課題の一つである。 自動車 の燃費向上は車体重量の軽量化、 燃焼の改善及びエンジンの低摩擦化により行わ れてきた。 エンジンの低摩擦化には、 例えば、 動弁系構造の改良、 ピス トンリン グの本数の低減、 摺動部材の表面粗さの低減、 及び低燃費エンジン油の使用等が 有効である。 これらのなかで低 費エンジン油の使用は費用対効果に優れている ことから、 巿場においても一般的になってきており、 そのようなエンジン油には W 摩擦低減に有効な添加剤として摩擦低減剤あるいは摩擦調整剤 (F M) が添加さ れている。 On the other hand, reducing fuel consumption (fuel saving) of cars, which began to be implemented in the wake of the oil crisis, is still one of the important issues from the viewpoint of resource and environmental protection. Improvements in vehicle fuel economy have been made by reducing vehicle weight, improving combustion, and reducing engine friction. For example, improving the valve train structure, reducing the number of piston rings, reducing the surface roughness of sliding members, and using fuel-efficient engine oil are effective ways to reduce engine friction. Of these, the use of low-cost engine oil is becoming more common in the field because of its cost-effectiveness. W Friction reducer or friction modifier (FM) is added as an effective additive for friction reduction.
長寿命化が期待されるエンジン油はその初期性能を長期に渡って維持しなけれ ばならないため、 清浄分散剤、 酸化防止剤、 摩耗防止剤等の性能添加剤を多く配 合する処方となっている。 そのため低燃費を目的に摩擦低減剤を配合しても、 そ の摩擦低減効果が阻害され、 低燃費性能が不十分となる。 また、 省燃費油に多く 用いられている摩擦調整剤、 特に有機モリブデン化合物は低摩擦性に非常に優れ ているが、 スラッジの生成の核となりやすいため、 清浄性における長寿命性能に 問題があった。 従って、 これまでに低燃費性能を付加させた長寿命エンジン油は 技術的にも開発が困難であり、 巿揚において未だなく、 その登場が切望されてい た。  Engine oils, which are expected to have a long service life, must maintain their initial performance over a long period of time.Therefore, it has been formulated to incorporate many performance additives such as detergents and dispersants, antioxidants, and antiwear agents. I have. Therefore, even if a friction reducing agent is added for the purpose of low fuel consumption, the friction reducing effect is impaired, and the low fuel consumption performance becomes insufficient. In addition, friction modifiers, which are widely used in fuel-saving oils, especially organic molybdenum compounds, are very excellent in low friction, but have a problem in long-life performance in cleanliness because they tend to be the core of sludge generation. Was. Therefore, it has been difficult to develop a long-life engine oil with low fuel consumption performance technically, and there has been no shortage of it in the field of pumping.
本発明は、以上のような問題に鑑み、長期に渡って清浄性に優れるだけでなく、' 低燃費性にも優れ、 廃油の低減と炭酸ガスの排出量の低減を可能とさせる内燃機 関用潤滑油組成物を提供することを目的とする。  In view of the above problems, the present invention not only has excellent cleanliness over a long period of time, but also has excellent fuel economy, and is capable of reducing waste oil and reducing carbon dioxide emissions. It is an object to provide a lubricating oil composition.
[発明の開示] [Disclosure of the Invention]
本発明者らは、 長期間に渡って清浄性に優れ、 かつ低 費性にも優れた内燃機 関用潤滑油組成物を開発するべく検討を重ねた結果、 特定の添加剤を特定の割合 で添加し、 組み合わせることにより、 上記課題を解決できることを見出し、 本発 明を完成するに至った。  The present inventors have repeatedly studied to develop a lubricating oil composition for internal combustion engines that is excellent in cleanliness and low cost over a long period of time, and as a result, a specific additive is added at a specific ratio. The inventors have found that the above problems can be solved by adding and combining them, and have completed the present invention.
すなわち、 本発明は、 (A) 1 0 0 °Cにおける動粘度が 2〜 8 mm 2Z sで全 芳香族含有量が 1 5質量%以下の鉱油及び Z又は合成油からなる基油に、 組成物 全量基準で、 (B ) 重量平均分子量が 6 5 0 0以上のポリブテュルコハク酸イミ ド及びノ又はその誘導体を 2〜1 5質量%、 ( C ) フエノール系及び/又はアミ ン系無灰酸化防止剤を 0 . 2 ~ 5質量。/。、 (D ) 重量平均分子量が 4 0 0 0 0 0 以上の粘度指数向上剤を 0 . 2〜 1 5質量0 /0、 及び (E ) 摩擦低減剤を 0 . 0 5 ~ 3質量%含有してなる内燃機関用潤滑油組成物にある。 That is, the present invention provides (A) a base oil comprising mineral oil and Z or synthetic oil having a kinematic viscosity at 100 ° C. of 2 to 8 mm 2 Zs and a total aromatic content of 15% by mass or less, (B) 2 to 15% by weight of polybutyrsuccinic acid imide and / or a derivative thereof having a weight average molecular weight of at least 600, (C) phenolic and / or amine based on the total amount of the composition. 0.2 to 5 mass of ashless antioxidant. /. , (D) a weight average molecular weight of 4 0 0 0 0 0 or more viscosity index improvers from 0.2 to 1 5 weight 0/0, and (E) the friction modifier 0.0 5 containing 1-3 wt% And a lubricating oil composition for an internal combustion engine.
また、 本発明は、 前記組成物に (F ) アルカリ土類金属スルホネート、 アル力 リ土類金属フエネート及ぴアルカリ土類金属サリシレートからなる群より選ばれ る少なくとも 1種のアルカリ土類金属系清浄剤がさらに含有されてなる内燃機関 用潤滑油組成物にある。 以下、 本発明の内燃機関用潤滑油組成物をその組成成分順に説明する。 Further, the present invention provides the composition, wherein (F) at least one kind of alkaline earth metal-based cleaning agent selected from the group consisting of alkaline earth metal sulfonates, alkaline earth metal phenates and alkaline earth metal salicylates. Internal combustion engine further containing an agent Lubricating oil composition. Hereinafter, the lubricating oil composition for an internal combustion engine of the present invention will be described in the order of the components.
(A ) 成分は、 鉱油及び/又は合成油からなる特定の基油である。  The component (A) is a specific base oil composed of mineral oil and / or synthetic oil.
鉱油としては、 具体的には、 原油を常圧蒸留及び減圧蒸留して得られた潤滑油 留分を、 溶剤脱れき、 溶剤抽出、 水素化分解、 溶剤脱ろう、 接触脱ろう、 水素化 精製、 硫酸洗浄、 白土処理等の精製処理等を適宜組み合わせて精製したパラフィ ン系あるいはナフテン系等の油やノルマルパラフィン等を挙げることができる。 溶剤精製、 水素化精製処理したものが一般的に用いられるが、 芳香族分をより低 減することが可能である高度水素化分解プロセスや G T L W a x (ガス · トウ 一- リキッド ' ワックス) を異性化した手法で製造したものを使用することがよ り好ましい。  As mineral oil, specifically, lubricating oil fractions obtained by distilling crude oil under normal pressure and reduced pressure are subjected to solvent removal, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining. Examples thereof include paraffinic or naphthenic oils and normal paraffins which are purified by appropriately combining purification treatments such as sulfuric acid washing and clay treatment. Solvent refining and hydrorefining are generally used, but advanced hydrocracking processes that can reduce aromatics and GTLW ax (gas-to-liquid-wax) It is more preferable to use one manufactured by a simplified method.
合成油としては、 具体的には、 ポリ一 α—ォレフィン (例えば、 1一オタテン オリ ゴマー、 1—デセンオリゴマー、 エチレン一プロピレンオリゴマー等) 、 ポ リー α—ォレフインの水素化物、 イソプテンオリゴマー、 イソブテンオリ ゴマー の水素化物、 イソパラフィン、 ァノレキノレベンゼン、 ァノレキノレナフダレン、 ジエス テル (例えば、 ジトリデシルグルタレート、 ジォクチルアジペート、 ジイソデシ ルアジペート、 ジトリデシルアジペート、 ジォクチルセバケート等) 、 ポリオ一 ルエステル (例えば、 トリメチロールプロパンカプリ レート、 トリメチロールプ 口パンペラルゴネート、 トリメチロールプロパンィソステアリネート等のト リメ チローノレプロパンエステノレ;ペンタエリスリ トーノレ 2一ェチルへキサノエ一ト、 ペンタエリスリ トーノレペラルゴネート等のペンタエリスリ トーノレエステル) 、 ポ リオキシアルキレングリ コール、 ジァルキノレジフエ-ルエーテル、 およびポリフ ユエルエーテル等が挙げられる。 (A) 成分としてはこれらの鉱油および合成油 の中から選ばれる 1種又は 2類以上の任意の混合油を使用することができる。  Specific examples of the synthetic oils include poly-α-olefin (eg, 11-otaten oligomer, 1-decene oligomer, ethylene-propylene oligomer, etc.), poly (α-olefin) hydride, isopten oligomer, isobutene Oligomer hydride, isoparaffin, anolequinolene benzene, anolequinolenaphdalene, and diester (e.g., ditridecyl glutarate, dioctyl adipate, diisodecyl adipate, ditridecyl adipate, dioctyl sebacate, etc.) Polyesters (such as trimethylolpropane caprylate, trimethylolpropanepanperargonate, trimethylolpropaneisostearate, etc .; Sanoe Ichito, Pentaerisuri Tono les esters such Pentaerisuri Tono les pelargonate), Po polyoxyalkylene glycol, di § Lucino registration Hue - ethers, and polyphenylene Yueru ether. As the component (A), one or more arbitrary mixed oils selected from these mineral oils and synthetic oils can be used.
(Α ) 成分の 1 0 0 °Cにおける動粘度は 2〜8 mm 2ノ sの範囲であることが 必要であり、 その好ましい範囲は 3〜 7 111111 2ノ sである。 (A ) 成分の 1 0 0 °Cにおける動粘度が 2 mm 2 / s未満では、 内燃機関から発生する熱による基油 の蒸発損失が多くなり、 粘度増加や排気ガスへの悪影響が懸念されるため好まし くない。 一方、 該動粘度が 8 mm 2 / sを超える場合、 粘性抵抗による動力損失 が大きくなり、 省燃費性能に劣るため好ましくない。 The kinematic viscosity of the component (Α) at 100 ° C. must be in the range of 2 to 8 mm 2 s, and the preferred range is 3 to 7111111 2 s. If the kinematic viscosity of the component (A) at 100 ° C is less than 2 mm 2 / s , the heat generated from the internal combustion engine will increase the evaporation loss of the base oil, which may increase the viscosity and adversely affect the exhaust gas. I don't like it. On the other hand, if the kinematic viscosity exceeds 8 mm 2 / s, power loss due to viscous drag And the fuel efficiency is poor, which is not preferable.
(A) 成分の芳香族含有量は 1 5質量%以下であることが必要であり、 その好 ましい範囲は 1 0質量。 /0以下、 特に好ましい範囲は 5質量。 /0以下である。 (A) 成分の芳香族分含有量が 1 5質量%を超える場合には酸化安定性が悪化し、 長期 間に渡って優れた清浄性を維持することができないため好ましくない。 全芳香族 含有量とは AS TM D 2549に規定される方法に準拠して測定した芳香族留 分 (a r oma t i c s f r a c t i o n) 含 ¾重 意味する。 The aromatic content of the component (A) must be 15% by mass or less, and the preferred range is 10% by mass. / 0 or less, a particularly preferred range is 5 mass. / 0 or less. If the aromatic content of the component (A) exceeds 15% by mass, oxidative stability deteriorates, and excellent cleanliness cannot be maintained over a long period of time. The total aromatic content means the content of an aromatic fraction measured in accordance with the method specified in ASTM D2549.
(A) 成分として混合油を用いる場合は、 混合油の 100°Cにおける動粘度が 2〜 8 mm 2Z sの範囲でかつ全芳香族含有量が 1 5質量%以下である限りにお いては、 混合油の一つの油がこの範囲から外れる基油、 例えば、 100°Cにおけ る動粘度が 8mm2/sを超える基油、 あるいは芳香族含有量が 1 5質量。 /0を超 える基油等を適宜混合して使用することができる。 In the case of using the mixed oil as the component (A), the range in and total aromatic content of kinematic viscosity 2~ 8 mm 2 Z s at 100 ° C of the oil mixture is have you as long as more than 1 5% by weight Is a base oil in which one of the mixed oils is out of this range, for example, a base oil having a kinematic viscosity at 100 ° C of more than 8 mm 2 / s or an aromatic content of 15 mass. Base oils exceeding / 0 can be used by being appropriately mixed.
(A) 成分の粘度指数は、 特に制限はないが、 1 10以上であることが好まし く、 1 20以上であることが特に好ましい。 粘度指数の高い基油を使用すること により、 より酸化安定性が高く、 低燃費性、 低温粘度特性に優れた組成物を得る ことができる。  The viscosity index of the component (A) is not particularly limited, but is preferably 110 or more, and particularly preferably 120 or more. By using a base oil having a high viscosity index, it is possible to obtain a composition having higher oxidation stability, excellent fuel economy, and excellent low-temperature viscosity characteristics.
(B) 成分は、 重量平均分子量が 6 500以上のポリブテニルコハク酸イミ ド 及び z又はその誘導体である。 ポリプテュルコハク酸イミ ドとしては、 下記一般 式 (1) 又は (2) で表されるポリブテエルコハク酸イミ ドが挙げられる。  The component (B) is a polybutenylsuccinic acid imide having a weight average molecular weight of 6500 or more and z or a derivative thereof. Examples of the polybutyrsuccinic acid imid include a polybuteric succinic acid imid represented by the following general formula (1) or (2).
Figure imgf000006_0001
一般式 (1) 又は (2) において、 P I Bはポリブテュル基を示し、 高純度ィ ソブテンあるいは 1ープテンとイソブテンの混合物をフッ化ホウ素系触媒ある ヽ は塩化アルミニゥム系触媒で重合させて得られるポリプテンから得られるもので あり、 ポリプテン混合物中において末端にビニリデン構造を有するものが通常 5 〜 1 0 0モル%含有される。 また、 優れたスラッジ抑制効果を得るためには、 n は 2〜5の整数、 好ましくは 3又は 4である。 また、 該ポリブテンは、 製造過程 の触媒に起因し、 残留する微量のフッ素分や塩素分を吸着法や十分な水洗等の適 切な方法により十分除去されたものが特に好ましく、 従ってこれらのフッ素や塩 素等のハロゲン元素の含有量は 5 0質量: p m以下であることが好ましく、 より 好ましくは 1 0質量 p p m以下、 更に好ましくは 5質量 p p m以下、 特に好まし くは 1質量 p p m以下である。
Figure imgf000006_0001
In the general formula (1) or (2), PIB represents a polybutene group, and is obtained by polymerizing a high-purity isobutene or a mixture of 1-butene and isobutene with a boron fluoride-based catalyst or with an aluminum chloride-based catalyst. What you can get Yes, those having a vinylidene structure at the terminal in the polyptene mixture are usually contained in an amount of 5 to 100 mol%. In order to obtain an excellent sludge control effect, n is an integer of 2 to 5, preferably 3 or 4. In addition, it is particularly preferable that the polybutene is one in which a trace amount of fluorine and chlorine remaining due to the catalyst in the production process has been sufficiently removed by an appropriate method such as an adsorption method or a sufficient washing with water. The content of halogen such as chlorine is preferably 50 mass: pm or less, more preferably 10 mass ppm or less, further preferably 5 mass ppm or less, and particularly preferably 1 mass ppm or less. .
一般式 (1 ) 又は (2 ) で表されるコハク酸イミ ドの製造法は特に制限はない。 例えば、 上記ポリプテンを塩素化したもの、 好ましくは塩素やフッ素が充分除去 されたポリブテンを無水マレイン酸と 1 0 0〜 2 0 0 °Cで反応させて得られるポ リブテュルコハク酸を、 ジエチレントリァミン、 トリエチレンテトラミン、 テト ラエチレンペンタミン、 あるいはペンタエチレンへキサミン等のボリ了ミンと反 応させる方法を利用することができる。 なお、 ビスコハク酸イミ ドを製造する場 合は、 該ポリブテュルコハク酸をポリアミンの 2倍量 (モル比) 反応させれば良 く、 モノコハク酸イミ ドを製造する場合は、 該ポリブテエルコハク酸とポリアミ ンを等量 (モル比) で反応させれば良い。  The method for producing the succinic acid imid represented by the general formula (1) or (2) is not particularly limited. For example, chlorinated polybutene, preferably polybutene from which chlorine and fluorine have been sufficiently removed, is reacted with maleic anhydride at 100 to 200 ° C. to obtain polybuturic succinic acid, diethylenetriamine, A method of reacting with boramine, such as triethylenetetramine, tetraethylenepentamine, or pentaethylenehexamine, can be used. In the case of producing bis-succinic acid imide, the polybutyrsuccinic acid may be reacted twice as much as the polyamine (molar ratio). In the case of producing mono-succinic acid imide, the polybutenyl succinic acid may be reacted with the polybutenyl succinic acid. Succinic acid and polyamine may be reacted in equal amounts (molar ratio).
これらの中では、 優れたスラッジ分散性が得られる点から、 ポリブテュルビス コハク酸イミ ドであることが好ましい。  Among these, polybuturbis succinic acid imide is preferred because excellent sludge dispersibility can be obtained.
また、 (B ) 成分のうち、 ポリブテュルコハク酸イミ ドの誘導体としては、 上 記一般式 (1 ) 又は (2 ) で表される化合物に、 例えば、 ホウ素化合物、 含酸素 有機化合物等を作用させて、 残存するァミノ基及び Z又はィミノ基の一部又は全 部を中和したり、 アミ ド化した化合物等が挙げられる。  In the component (B), the polybutyrsuccinic acid imide derivative includes, for example, a boron compound and an oxygen-containing organic compound in addition to the compound represented by the general formula (1) or (2). Compounds that act to neutralize or amidate some or all of the remaining amino and / or Z or imino groups.
一般式 (1 ) 又は (2 ) の化合物に作用させるホウ素化合物としては、 ホウ酸、 ホウ酸塩、 ホウ酸エステル類等が挙げられる。 ホウ酸としては、 具体的には例え ばオルトホウ酸、 メタホウ酸及びテトラホウ酸等が挙げられる。 ホウ酸塩として は、 ホウ酸のアルカリ金属塩、 アルカリ土類金属塩又はアンモ ウム塩等が挙げ られ、 より具体的には、 例えばメタホウ酸リチウム、 四ホウ酸リチウム、 五ホウ 酸リチウム、 過ホウ酸リチウム等のホウ酸リチウム ; メタホウ酸ナトリウム、 二 ホウ酸ナトリウム、 四ホウ酸ナトリウム、 五ホウ酸ナトリウム、 六ホウ酸ナトリ ゥ'ム、 八ホウ酸ナトリウム等のホウ酸ナトリウム ; メタホウ酸カリウム、 四ホウ 酸カリウム、 五ホウ酸カリウム、 六ホウ酸カリウム、 八ホウ酸カリウム等のホウ 酸カリウム ;メタホウ酸カルシウム、 二ホウ酸カルシウム、 四ホウ酸三カルシゥ ム、 四ホウ酸五カルシウム、 六ホウ酸カルシウム等のホウ酸カルシウム ; メタホ ゥ酸マグネシウム、 二ホウ酸マグネシウム、 四ホウ酸三マグネシウム、 四ホウ酸 五マグネシウム、 六ホウ酸マグネシウム等のホウ酸マグネシウム;及びメタホウ 酸アンモニゥム、 四ホウ酸アンモユウム、 五ホウ酸アンモ-ゥム、 八ホウ酸アン モユウム等のホウ酸アンモ-ゥム等が挙げられる。 また、 ホウ酸エステルとして は、 ホウ酸と好ましくは炭素数 1〜6の脂肪族アルコールとのエステル等が挙げ られ、 より具体的には例えば、 ホウ酸モノメチル、 ホウ酸ジメチル、 ホウ酸トリ メチル、 ホウ酸モノエチル、 ホウ酸ジェチル、 ホウ酸トリエチル、 ホウ酸モノプ 口ピル、 ホウ酸ジプロピル、 ホウ酸トリプロピル、 ホウ酸モノプチル、 ホウ酸ジ プチル、 ホウ酸トリプチル等が挙げられる。 Examples of the boron compound that acts on the compound of the general formula (1) or (2) include boric acid, borates, and borate esters. Specific examples of boric acid include orthoboric acid, metaboric acid, and tetraboric acid. Examples of the borate include alkali metal salts, alkaline earth metal salts and ammonium salts of boric acid, and more specifically, for example, lithium metaborate, lithium tetraborate, lithium pentaborate, perborate Lithium borate such as lithium phosphate; sodium metaborate, sodium diborate, sodium tetraborate, sodium pentaborate, sodium hexaborate Sodium borate such as sodium octaborate; potassium metaborate, potassium tetraborate, potassium pentaborate, potassium hexaborate, potassium octaborate, etc .; potassium metaborate, calcium metaborate, diborate Calcium borate such as calcium, tricalcium tetraborate, pentacalcium tetraborate, calcium hexaborate; magnesium metaborate, magnesium diborate, trimagnesium tetraborate, pentamagnesium tetraborate, hexaborate Magnesium borate such as magnesium; and ammonium borate such as ammonium metaborate, ammonium tetraborate, ammonium pentaborate, and ammonium octaborate. Examples of the borate ester include an ester of boric acid and preferably an aliphatic alcohol having 1 to 6 carbon atoms. More specifically, for example, monomethyl borate, dimethyl borate, trimethyl borate, Monoethyl borate, getyl borate, triethyl borate, monopropyl borate pill, dipropyl borate, tripropyl borate, monobutyl borate, dibutyl borate, triptyl borate and the like.
上記ホウ素化合物を作用させたコハク酸イミ ド誘導体は、 輯熱性、 酸化安定性 に優れることから好ましく用いられる。  The succinic acid imido derivative treated with the above boron compound is preferably used because of its excellent heat resistance and oxidation stability.
一般式 (1 ) 又は (2 ) の化合物に作用させる含酸素有機化合物としては、 具 体的には、 例えば、 ぎ酸、 酢酸、 グリコール酸、 プロピオン酸、 乳酸、 酪酸、 吉 草酸、 カプロン酸、 ェナント酸、 力プリル酸、 ペラルゴン酸、 力プリン酸、 ゥン デシル酸、 ラウリン酸、 トリデカン酸、 ミリスチン酸、 ペンタデカン酸、 パルミ チン酸、 マルガリン酸、 ステアリン酸、 ォレイン酸、 ノナデカン酸、 エイコサン 酸等の炭素数 1〜 3 0のモノカルボン酸;シユウ酸、 フタル酸、 トリメリット酸、 ピロメ リット酸等の炭素数 2〜 3 0のポリカルポン酸若しくはこれらの無水物、 又はエステル化合物;炭素数 2〜 6のアルキレンォキサイ ド; ヒ ドロキシ (ポリ) ォキシアルキレンカーボネート等が挙げられる。 このような含酸素有機化合物を 作用させることで、 例えば、 一般式 (1 ) 又は (2 ) の化合物におけるアミノ基 又はィミノ基の一部又は全部が次の一般式(3 )で示す構造になると推定される。  Specific examples of the oxygen-containing organic compound acting on the compound of the general formula (1) or (2) include, for example, formic acid, acetic acid, glycolic acid, propionic acid, lactic acid, butyric acid, valeric acid, caproic acid, Enanthic acid, caprylic acid, pelargonic acid, capric acid, pendecylic acid, lauric acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, margaric acid, stearic acid, oleic acid, nonadecanoic acid, eicosanoic acid, etc. A monocarboxylic acid having 1 to 30 carbon atoms; a polycarboxylic acid having 2 to 30 carbon atoms such as oxalic acid, phthalic acid, trimellitic acid, and pyromellitic acid, or anhydrides or ester compounds thereof; 6 alkylene oxides; and hydroxy (poly) oxyalkylene carbonates. By causing such an oxygen-containing organic compound to act, for example, when a part or all of the amino group or imino group in the compound of the general formula (1) or (2) has a structure represented by the following general formula (3) Presumed.
-N-  -N-
?7° (3) ? 7 ° ( 3 )
R で R 1は水素原子、 炭素数 1〜 2 4のアルキル基、 アルケニル基、 アルコ キシ基、 又は一 0_(R20)mHで表されるヒ ドロキシ (ポリ) ォキシアルキレ ン基を示し、 R 2は炭素数 1〜4のアルキレン基を示し、 mは 1〜5の整数を示 す。 R 1 R is a hydrogen atom, an alkyl group having 1-2 4 carbon atoms, an alkenyl group, alkoxycarbonyl Alkoxy group, or one 0_ (R 2 0) shows the human Dorokishi (poly) Okishiarukire emissions group represented by m H, R 2 is an alkylene group having 1 to 4 carbon atoms, m is an integer of 1 to 5 Shown.
これらの中ではァミノ基又はィミノ基の全てにこれらの含酸素有機化合物を作 用させたものを主成分とするポリプテュルピスコハク酸ィミ ドがスラッジ分散性 に優れるため好ましく用いられる。 そのような化合物は、 例えば (1) 式の化合 物 1モルに対し(n— 1)モルの含酸素有機化合物を作用させることで得られる。 このような含酸素有機化合物を作用させたコハク酸イミ ド誘導体は、 スラッジ分 散性に優れ、 特にヒドロキシ (ポリ) ォキシアルキレンカーボネートを作用させ たものが好ましい。  Among them, polypulpisuccinic imide containing as a main component a compound obtained by acting these oxygen-containing organic compounds on all of the amino or imino groups is preferably used because of its excellent sludge dispersibility. Such a compound can be obtained, for example, by reacting (n-1) mol of an oxygen-containing organic compound with 1 mol of the compound of the formula (1). The succinic acid imid derivative treated with such an oxygen-containing organic compound is excellent in sludge dispersibility, and is preferably a compound treated with hydroxy (poly) oxyalkylene carbonate.
本発明において、 (B) 成分は上記ポリブテニルコハク酸イミ ド及び/又はそ の誘導体の中から選ばれる任意のものが使用可能であるが、 その重量平均分子量 は、 6 500以上であり、 好ましくは 7000以上、 より好ましくは 8000以 上、 特に好ましくは 9000以上である。 重量平均分子量が 6 500未満では、 非極性基のポリブテュル基の分子量が小さくスラッジの分散性に劣り、 また、 酸 化劣化の活性点となる恐れのある極性基のアミン部分が相対的に多くなつて酸化 安定性に劣るため、本発明のような優れた長寿命化効果は得られない。一方、 (B) 成分の重量平均分子量の上限は特に制限はないが、 低温粘度特性の悪化を防止す る観点から、 20000以下であることが好ましく、 1 5000以下であること が特に好ましい。  In the present invention, as the component (B), any one selected from the above-mentioned polybutenylsuccinic acid imides and / or derivatives thereof can be used, and the weight average molecular weight is 6500 or more, It is preferably at least 7000, more preferably at least 8000, particularly preferably at least 9000. When the weight average molecular weight is less than 6500, the molecular weight of the non-polar polybutul group is small and the dispersibility of sludge is poor, and the amine portion of the polar group, which may be an active site for oxidation deterioration, becomes relatively large. As a result, the oxidation stability is inferior, so that the excellent effect of extending the life as in the present invention cannot be obtained. On the other hand, the upper limit of the weight average molecular weight of the component (B) is not particularly limited, but is preferably 20,000 or less, particularly preferably 15,000 or less, from the viewpoint of preventing the deterioration of the low-temperature viscosity characteristics.
なお、 ここで重量平均分子量とは、 ウォーターズ製の 1 50— C ALCZG PC装置に東ソー (株) 製の GMHHR— M ( 7. 8mm I D X 30 c m) の力 ラムを 2本直列に使用し、 溶媒としてはテトラヒドロフラン、 温度 23°C、 流速 lmLZ分、 試料濃度 1質量%、 試料注入量 7 5 /x L、 検出器示差屈折率計 (R I ) で測定したポリスチレン換算の重量平均分子量のことである。  The weight-average molecular weight used here refers to a 150-C ALCZG PC system from Waters and two series of GMHHR-M (7.8 mm IDX 30 cm) manufactured by Tosoh Corporation in series. Means tetrahydrofuran, temperature 23 ° C, flow rate lmLZ, sample concentration 1 mass%, sample injection amount 75 / xL, weight average molecular weight in terms of polystyrene measured with a detector differential refractometer (RI). .
本発明における (B) 成分の含有量は、 組成物全量基準でその下限値は 2質量 %> 好ましくは 3質量%であり、 一方、 その上限値は 1 5質量%、 好ましくは 1 0質量%である。 (B) 成分の含有量が 2重量%に満たない場合は、 十分な清浄 性効果が発揮できず、一方、 その含有量が 1 5質量%を超える場合は、低燃費性、 低温粘度特性の悪化及び抗乳化性が悪化するためそれぞれ好ましくない。 (C) 成分はフエノール系及び 又はアミン系無灰酸化防止剤である。 The lower limit of the content of the component (B) in the present invention is 2% by mass>, preferably 3% by mass, based on the total amount of the composition, while the upper limit is 15% by mass, preferably 10% by mass. It is. When the content of the component (B) is less than 2% by weight, a sufficient cleansing effect cannot be exerted. On the other hand, when the content exceeds 15% by mass, low fuel consumption and low-temperature viscosity characteristics are not obtained. It is not preferable because the deterioration and the demulsification property deteriorate. The component (C) is a phenolic and / or amine ashless antioxidant.
フエノール系無灰酸化防止剤としては、 具体的には、 例えば、 4, 4' ーメチ レンビス (2, 6—ジ一 t e r t—ブチルフエノール) 、 4, 4 ' 一ビス (2, 6ージー t e r t—ブチルフエノール) 、 4, 4 ' 一ビス (2—メチノレー 6— t e r tーブチノレフエノ一ノレ) 、 2, 2 ' ーメチレンビス (4—ェチルー 6— t e r t—プチノレフエノーノレ) 、 2, 2 ' ーメチレンビス (4ーメチノレ一 6— t e r t—プチノレフエノーノレ) 、 4, 4, ーブチリデンビス (3—メチノレー 6— t e r t—プチ/レフェノール) 、 4, 4 ' 一イソプロピリデンビス (2, 6—ジー t e r t—プチノレフエノール) 、 2, 2, ーメチレンビス (4ーメチノレ一 6—ノエノレ フエノール) 、 2, 2' —イソブチリデンビス (4, 6—ジメチルフエノール) 、 2 , 2, 一メチレンビス (4ーメチノレー 6—シクロへキシルフエノーノレ) 、 2, 6—ジ一 t e r t—ブチノレー 4ーメチノレフエノーノレ、 2, 6—ジー t e r t—ブ チルー 4—ェチルフェノール、 2, 4ージメチノレー 6— t e r t—ブチノレフエノ 一ノレ、 2, 6—ジ一 t e r t _ a—ジメチノレアミノ一: —クレゾール、 2, 6— ジー t e r t—ブチノレー 4 (N, N' —ジメチノレアミノメチノレフエノーノレ) 、 4, 4, ーチォビス ( 2—メチノレー 6 - t e r t -ブチノレフェノ一ノレ) 、 4, 4, 一 チォビス ( 3ーメチルー 6— t e r t—プチノレフエノール) 、 2, 2 ' —チオビ ス (4ーメチノレー 6 _ t e r t—ブチルフエノーノレ) 、 ビス (3—メチノレー 4— ヒ ドロキシ一 5— t e r t—ブチノレべンジノレ) スゾレフイ ド、 ビス (3, 5—ジ一 t e r tーブチノレー 4ーヒ ドロキシベンジノレ) スノレフィ ド、 2, 2, 一チォージ エチレンビス [ 3— ( 3 , 5ージー t e r t—ブチノレー 4—ヒ ドロキシフエ二ノレ) プロピオネート] 、 ォクチルー 3— ( 3, 5—ジー t e r t—プチルー 4ーヒ ド ロキシフエニル) プロピオネート、 トリデシルー 3— (3, 5—ジー t e r t— ブチノレー 4ーヒ ドロキシフエニル) プロピオネート、 ペンタエリスリチノレーテ ト ラキス [3— (3, 5—ジー t e r t—プチル一 4ーヒ ドロキシフエニル) プロ ピオネート] 、 ォクタデシルー 3— (3, 5—ジー t e r t—ブチル一 4—ヒ ド ロキシフエ-ル) プロピオネート、 及びこれらの混合物等が挙げられる。 また、 これらの中でも分子量が 240以上のフエノール系化合物は、 分解温度が高く、 より高温条件においてもその効果が発揮されるため、 より好ましく用いられる。 アミン系無灰酸化防止剤としては、 具体的には、 フエニル一 一ナフチルアミ ン、 ァノレキルフエニノレー a—ナフチノレアミン、 ジァノレキノレジフエ-ルァミン、 N, N' —ジフエ-ルー p—フエ二レンジァミン及びこれらの混合物が挙げられる。 ここでアルキル基としては炭素数 1〜 20の直鎖又は分岐のアルキル基が挙げら れる。 Examples of the phenolic ashless antioxidants include, for example, 4,4′-methylenebis (2,6-di-tert-butylphenol), 4,4′-bis (2,6-g-tert-butyl) Phenol), 4,4'-bis (2-methynole 6-tert-butylinolephenol), 2,2'-methylenebis (4-ethyl-6-tert-ptinolephenole), 2,2'-methylenebis (4-methyltinole) 6-tert-butylinophenol, 4,4, butylidenebis (3-methynole 6-tert-butyl / lephenol), 4,4'-isopropylidenebis (2,6-di-tert-butylenophenol) , 2,2, -methylenebis (4-methynole-6-noenophenol), 2,2'-isobutylidenebis (4,6-dimethylphenol), 2,2,1-methylenebis (4-methinolay 6-cyclohexylf) 2,6-di-tert-butynole 4-, methino-le-phenol, 2,6-di-tert-butyl 4-ethylphenol, 2,4-dimethynole 6-tert-butyn-le-no-eno, 2,6 —Di-tert-a—Dimethinoleamino-1: —Cresol, 2,6—Di-tert-butynole 4 (N, N′—Dimethinoleaminomethynolephenole), 4,4, -thiobis (2-methinole 6-tert) -Butynolephenone), 4,4,1-thiobis (3-methyl-6-tert-butylinophenol), 2,2'-thiobis (4-methinole 6_tert-butylphenol), bis (3-methinole 4) — Hydroxy-5-tert-butynolebenzole) Szolefide, Bis (3,5-di-tert-butynole) 4-Hydroxybenzinole Snorefide, 2,2,1-Thiodiethylenebis [3— (3, 5-G tert-butynole 4-propoxynate) propionate], octyl 3- (3,5-g tert-butyl- 4-hydroxy phenyl) propionate, tridecyl 3- (3,5-g tert-butynole 4) (Droxyphenyl) propionate, pentaerythritinoleate trakis [3- (3,5-di-tert-butyl-l-4-hydrodroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-14-hydrid) Roxifile) propionate, and mixtures thereof. Among them, phenolic compounds having a molecular weight of 240 or more are more preferably used because they have a high decomposition temperature and exhibit their effects even under higher temperature conditions. Examples of the amine-based ashless antioxidants include phenyl-naphthylamido. Phenol, phenolic phenol, a-naphthinoleamine, dianolequinolesiphenyl-lamine, N, N'-diphenyl-p-phenylenediamine and mixtures thereof. Here, examples of the alkyl group include a linear or branched alkyl group having 1 to 20 carbon atoms.
本発明における (C) 成分の含有量は、 組成物全量基準でその下限値は、 0. 2質量 °/0、 好ましくは 0. 3質量%、 特に好ましくは 0. 4'質量%であり、 一方、 その上限値は、 5質量%、 好ましくは 2. 5質量%、 特に好ましくは 2. 0質量 %である。 その含有量が 0. 2質量。/。未満の場合、 本発明の組成物が長期間に渡 つて優れた清浄性を維持させることができず、 一方、 含有量が 5質量%を超える 場合、 組成物の貯蔵安定性が悪化するため、 それぞれ好ましくない。 なお、 本発 明においては、 (C) 成分として、 組成物全量基準でフエノール系無灰酸化防止 剤 0. 4〜 2質量%及びアミン系無灰酸化防止剤 0. 4〜2質量■%を用いる、 あ るいは、 アミン系酸化防止剤を 1〜 2質量%を用いることが特に好ましく、 これ により長期に渡り優れた清浄性を維持させることができる。 The lower limit of the content of the component (C) in the present invention is 0.2% by mass / 0 , preferably 0.3% by mass, particularly preferably 0.4 '% by mass, based on the total amount of the composition. On the other hand, the upper limit is 5% by mass, preferably 2.5% by mass, particularly preferably 2.0% by mass. Its content is 0.2 mass. /. When the amount is less than 5%, the composition of the present invention cannot maintain excellent cleanliness for a long period of time. On the other hand, when the content exceeds 5% by mass, the storage stability of the composition deteriorates. Each is not preferred. In the present invention, as the component (C), 0.4 to 2% by mass of a phenol-based ashless antioxidant and 0.4 to 2% by mass of an amine-based ashless antioxidant based on the total amount of the composition. It is particularly preferable to use the amine antioxidant in an amount of 1 to 2% by mass, so that excellent cleanliness can be maintained over a long period of time.
(D) 成分の粘度指数向上剤としては、 非分散型、 あるいは分散型の粘度指数 向上剤等が挙げられる。  Examples of the viscosity index improver of the component (D) include non-dispersion type or dispersion type viscosity index improvers.
非分散型粘度指数向上剤としては、 具体的には、 下記一般式 (4) 、 (5) 及 び (6) で表される化合物の中から選ばれる 1種又は 2種以上のモノマー (D— 1) の共重合体あるいはその水素化物等が例示できる。  Specific examples of the non-dispersion type viscosity index improver include one or more monomers (D) selected from compounds represented by the following general formulas (4), (5) and (6). — The copolymer of 1) or a hydride thereof can be exemplified.
また、分散型粘度指数向上剤としては、具体的には、下記一般式(7)及び(8) で表される化合物の中から選ばれる 2種以上のモノマーの共重合体又はその水素 化物に酸素含有基を導入したものや、 一般式 (4) 〜 (6) で表される化合物の 中から選ばれる 1種又は 2種以上のモノマー (D— 1) と一般式 (7) 及び (8) で表される化合物の中から選ばれる 1種又は 2種以上のモノマー (D— 2) との 共重合体、 或いはその水素化物等が例示できる。  Further, as the dispersion type viscosity index improver, specifically, a copolymer of two or more monomers selected from the compounds represented by the following general formulas (7) and (8) or a hydride thereof is used. Oxygen-containing groups or one or more monomers (D-1) selected from compounds represented by general formulas (4) to (6) and general formulas (7) and (8) ), A copolymer with one or more monomers (D-2) selected from the compounds represented by the following formulas, or a hydride thereof.
R11 R 11
COOR 一般式 (4) において、 R 11は水素原子又はメチル基を示し、 R 12は炭素数 1〜 1 8のアルキル基を示す。 R 1 2を示す炭素数 1〜 1 8のアルキル基としては、 具体的には、 メチル基、 ェチル基、 プロピル基、 プチル基、 ペンチル基、 へキシル基、 ヘプチル基、 オタ チル基、 ノニル基、 デシル基、 デシル基、 ゥンデシル基、 ドデシル基、 トリデシ ル基、 テトラデシル基、 ペンタデシル基、 へキサデシル基、 ヘプタデシル基、 及 びォクタデシル基等 (これらのアルキル基は直鎖状でも分枝状でもよい) が例示 できる。 In the COOR formula (4), R 11 represents a hydrogen atom or a methyl group, and R 12 represents an alkyl group having 1 to 18 carbon atoms. Specific examples of the alkyl group having 1 to 18 carbon atoms for R 12 include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, and a nonyl group. , Decyl group, decyl group, decyl group, dodecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, etc. (The alkyl groups may be linear or branched. ) Can be exemplified.
13 .  13 .
,R (5) , R (5)
CH2=Cヽ 14 ^ CH 2 = C ヽ14 ^
R 一般式 (5 ) において、 R 1 3は水素原子又はメチル基を示し、 R 1 4は炭素数 1〜 1 2の炭化水素基を示す。 R In the general formula (5), R 13 represents a hydrogen atom or a methyl group, and R 14 represents a hydrocarbon group having 1 to 12 carbon atoms.
R 1 4を示す炭素数 1〜 1 2の炭化水素基としては、 具体的には、 メチル基、 ェチル基、 プロピル基、 ブチル基、 ペンチル基、 へキシル基、 ヘプチル基、 オタ チル基、 ノ-ル基、 デシル基、 ゥンデシル基、 ドデシル基等のアルキル基 (これ らのアルキル基は直鎖状でも分枝状でもよい) ;ブテュル基、 ペンテ-ル基、 へ キセ-ル基、 ヘプテュル基、 オタテュル基、 ノネ-ル基、 デセエル基、 ゥンデセ -ル基、 ドデセニル基等のァルケ-ル基 (これらのァルケエル基は直鎖状でも分 枝状でもよく、 二重結合の位置も任意である) ;シクロペンチル基、 シクロへキ シル基、 シクロへプチル基等の炭素数 5 ~ 7のシクロアルキル基; メチルシクロ ペンチル基、 ジメチノレシクロペンチル基、 メチノレエチノレシクロペンチル基、 ジェ チルシク口ペンチル基、 メチルシク口へキシル基、 ジメチルシクロへキシル基、 メチルェチルシクロへキシル基、 ジェチルシクロへキシル基、 メチルシク口ヘプ チル基、 ジメチノレシク口へプチノレ基、 メチノレエチノレシク口へプチノレ基、 ジェチル シクロへプチル基等の炭素数 6〜 1 1のアルキルシクロアルキル基 (これらのァ ルキル基のシクロアルキル基への置換位置は任意である) ;フエニル基、 ナフチ ル基等のァリール基; トリル基、 キシリル基、 ェチルフ.ェ-ル基、 プロピルフエ ニル基、 プチ/レフェュノレ基、 ペンチルフエ二ル基、 へキシルフェニル基等の炭素 数 7〜 1 ,2のアルキルァリール基 (これらのアルキル基は直鎖状でも分枝状でも よく、 またァリール基への置換位置も任意である) ;ベンシル基、 フエ-ルェチ ル基、 フエニルプロピル基、 フエニルブチル基、 フエ-ルペンチル基、 フエエル へキシル基等の炭素数 7〜 1 2のァリールアルキル基 (これらのアルキル基は直 鎖状でも分枝状でもよい) ;等が例示できる。 Specific examples of the hydrocarbon group having 1 to 12 carbon atoms representing R 14 include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, and a Alkyl groups such as benzyl, decyl, pendecyl, and dodecyl groups (the alkyl groups may be straight-chain or branched); butyl, pentyl, hexyl, heptyl , Octayl, nonyl, decelle, pendenyl, dodecenyl and other alkenyl groups (the alkenyl groups may be linear or branched, and the position of the double bond is arbitrary. ); A cycloalkyl group having 5 to 7 carbon atoms, such as a cyclopentyl group, a cyclohexyl group, or a cycloheptyl group; a methylcyclopentyl group, a dimethinolecyclopentyl group, a methinoolethynolecyclopentyl group, a jeti Pentyl group at the mouth, Methylhexyl group at the mouth, Methylcyclohexyl group, Methylethylcyclohexyl group, Jetylcyclohexyl group, Heptyl group at the Methyl mouth, Heptinole group at the Dimethinoresic mouth, Heptinole at the Methinoleetinole mouth Alkylcycloalkyl groups having 6 to 11 carbon atoms, such as acetyl, acetyl and heptyl groups (the substitution positions of these alkyl groups with cycloalkyl groups are arbitrary); aryl groups such as phenyl and naphthyl groups An alkylaryl group having 7 to 1 or 2 carbon atoms such as a tolyl group, a xylyl group, an ethylphenyl group, a propylphenyl group, a petit / refenolle group, a pentylphenyl group, a hexylphenyl group; The group may be linear or branched, and the position of substitution with the aryl group is arbitrary.); E Ji group, phenylpropyl group, phenylbutyl group, Hue - Rupenchiru group, Fueeru An arylalkyl group having 7 to 12 carbon atoms such as a hexyl group (the alkyl group may be linear or branched); and the like.
0 0  0 0
15 II II 16 、  15 II II 16,
R― C-CH=CH-C-R W 一般式 (6) において、 R 15及び R 16は、 それぞれ個別に、 水素原子、 炭素 数 1〜 1 8のアルコキシ基 (一OR17 : R 17は炭素数 1〜 1 8のアルキル基) 又は炭素数 1〜 1 8のモノアルキルアミノ基 (一NHR18 : 1 18は炭素数1〜 1 8のアルキル基) を示す。 上記炭素数 1〜1 8のアルキル基としては、 前記式 (4) における R 12で表されるアルキル基の例と同じものを挙げることができ る。 R—C—CH = CH—CR W In the general formula (6), R 15 and R 16 are each independently a hydrogen atom, an alkoxy group having 1 to 18 carbon atoms (one OR 17 : R 17 is a carbon atom An alkyl group having 1 to 18 carbon atoms or a monoalkylamino group having 1 to 18 carbon atoms (one NHR 18 : 118 is an alkyl group having 1 to 18 carbon atoms). Examples of the alkyl group having 1 to 18 carbon atoms include the same alkyl groups as those represented by R 12 in the formula (4).
19  19
C¾= 20、 , (7) C ¾ = 20,, ( 7 )
COO— (R ^X1 COO— (R ^ X 1
a  a
一般式 (7) において、 R 19は水素原子又はメチル基を示し、 R2 Gは、 炭素 数 1〜 1 8のアルキレン基を示し、 X1は窒素原子を 1又は 2個及ぴ酸素原子を 0〜 2個含有するアミン残基又は複素環残基を示し、 aは 0又は 1である。 In the general formula (7), R 19 represents a hydrogen atom or a methyl group, R 2 G represents an alkylene group having 1 to 18 carbon atoms, and X 1 represents one or two nitrogen atoms and an oxygen atom. It represents an amine residue or a heterocyclic residue containing 0 to 2 groups, and a is 0 or 1.
R2°を示す炭素数 1 ~ 1 8のアルキレン基としては、 具体的には、 エチレン 基、 プロピレン基、 ブチレン基、 ペンチレン基、 へキシレン基、 ヘプチレン基、 オタチレン基、 ノエレン基、 デシレン基、 ゥンデシレン基、 ドデシレン基、 トリ デシレン基、 テトラデシレン基、 ペンタデシレン基、 へキサデシレン基、 ヘプタ デシレン基、 及びォクタデシレン基等 (これらのアルキレン基は直鎖状でも分枝 状でもよい) 等が例示できる。 Specific examples of the alkylene group having 1 to 18 carbon atoms that represents R 2 ° include an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, a heptylene group, an otaylene group, a noylene group, a decylene group, Examples include pendecylene group, dodecylene group, tridecylene group, tetradecylene group, pentadecylene group, hexadecylene group, heptadecylene group, and octadecylene group (the alkylene groups may be linear or branched).
また、 X1を示す基としては、 具体的には、 ジメチルァミノ基、 ジェチルアミ ノ基、 ジプロピルアミノ基、 ジブチルァミノ基、 ァェリノ基、 トルイジノ基、 キ シリジノ基、 ァセチルァミノ基、 ベンゾィルァミノ基、 モルホリノ基、 ピロリル 基、 ピロリノ基、 ピリジル基、 メチルピリジル基、 ピロリジニル基、 ピぺリジニ ル基、 キノュル基、 ピロリ ドニル基、 ピロリ ドノ基、 イミダゾリノ基、 及ぴピラ ジノ基等が例示できる。
Figure imgf000014_0001
一般式 (8) において、 R 21は水素原子又はメチル基を示し、 X 2は窒素原子 を 1又は 2個及び酸素原子を 0〜 2個含有するァミン残基又は複素環残基を示す c
Specific examples of the group represented by X 1 include a dimethylamino group, a acetylamino group, a dipropylamino group, a dibutylamino group, a erino group, a toluidino group, a xylidino group, an acetylamino group, a benzoylamino group, a morpholino group, and a pyrrolyl group. Groups, a pyrrolino group, a pyridyl group, a methylpyridyl group, a pyrrolidinyl group, a pyridinyl group, a quinur group, a pyrrolidonyl group, a pyrrolidno group, an imidazolino group, and a pyrazino group.
Figure imgf000014_0001
In the general formula (8), R 21 represents a hydrogen atom or a methyl group, X 2 represents a Amin residue or heterocyclic residue containing two 0 to 1 or 2 and oxygen atoms and nitrogen atoms c
X2を示す基としては、 前記式 (7) における X1で表されるァミン残基又は 複素環残基の例と同じものを挙げることができる。 The group represented by X 2, can be the same as the example of Amin residue or heterocyclic residue represented by X 1 in the formula (7).
(D— 1) 成分のモノマーの好ましいものとしては、 具体的には、 炭素数 1〜 1 8のアルキルァクリ レート、 炭素数 1— 1 8のアルキルメタクリ レー卜、 炭素 数 2〜 20のォレフィン、 スチレン、 メチノレスチレン、無水マレイン酸エステノレ、 無水マレイン酸アミ ド及びこれらの混合物等が例示できる。  Preferred examples of the monomer as the component (D-1) include alkyl acrylates having 1 to 18 carbon atoms, alkyl methacrylates having 1 to 18 carbon atoms, olefins having 2 to 20 carbon atoms, and styrene. Methionole styrene, maleic anhydride estenole, maleic anhydride amide, and mixtures thereof.
(D— 2) 成分のモノマーの好ましいものとしては、 具体的には、 ジメチルァ ミノメチルメタタリ レート、 ジェチルアミノメチルメタクリ レート、 ジメチルァ ミノェチルメタタリ レート、 ジェチルアミノエチルメタタリ レート、 2_メチル 一 5—ビエルピリジン、 モルホリ ノメチルメタクリ レート、 モルホリノェチルメ タクリレート、 N—ビュルピロリ ドン及びこれらの混合物等が例示できる。  Preferred examples of the monomer as the component (D-2) include dimethylaminomethyl methacrylate, dimethylaminomethyl methacrylate, dimethylaminoethyl methacrylate, dimethylaminoethyl methacrylate, and dimethylaminoethyl methacrylate. Examples thereof include _methyl-15-bipyridine, morpholinomethyl methacrylate, morpholinoethyl methacrylate, N-bulpyrrolidone, and mixtures thereof.
上記 (D— 1) 化合物の中から選ばれる 1種又は 2種以上のモノマーと、 (D 一 2) 化合物の中から選ばれる 1種又は 2種以上のモノマーとを共重合する際の (D— 1) 成分と (D— 2) 成分のモル比は任意であるが、 一般に、 80 : 20 〜9 5 : 5程度である。 また共重合の反応方法も任意であるが、 通常ベンゾィル パーォキシド等の重合開始剤の存在下で (D— 1) 成分と (D— 2) 成分をラジ 力ル溶液重合させることにより容易に共重合体が得られる。  (D-1) When one or two or more monomers selected from the compounds are copolymerized with one or more monomers selected from the (D-1) compounds, the (D-1) — The molar ratio between component (1) and component (D-2) is arbitrary, but is generally about 80:20 to 95: 5. The reaction method for copolymerization is also optional, but it is usually easy to carry out copolymerization by subjecting component (D-1) and component (D-2) to a solution polymerization in the presence of a polymerization initiator such as benzoyl peroxide. Coalescence is obtained.
粘度指数向上剤 (D) の重量平均分子量は、 せん断場における一時的粘度低下 が大きいことを考慮して選定することが必要である。 具体的には、 (D) 成分の 重量均分子量の下限値は、 400, 000であり、 好ましくは 600, 000であ る。 一方、 その上限値は、 1, 000, 000であることが好ましく、 更に好まし くは 9 00, 000である。 (D) 成分の重量平均分子量が上記下限値未満であ る場合、低燃費性能に劣り、一方上記上限値を超えるとせん断安定性に劣るため、 それぞれ好ましくない。 本発明における (D ) 成分の含有量は、 所望のエンジン油の S A E粘度グレー ド (S A E J 3 0 0により規定) によって異なるが、 組成物全量基準で、 0 .It is necessary to select the weight average molecular weight of the viscosity index improver (D) in consideration of a large temporary viscosity decrease in the shear field. Specifically, the lower limit of the weight average molecular weight of the component (D) is 400,000, preferably 600,000. On the other hand, the upper limit is preferably 1,000,000, more preferably 900,000. When the weight average molecular weight of the component (D) is less than the above lower limit, the fuel economy performance is poor, and when it exceeds the above upper limit, the shear stability is poor, which is not preferable. The content of the component (D) in the present invention depends on the SAE viscosity grade of the desired engine oil (specified by SAEJ300), but it is 0.1% based on the total amount of the composition.
2〜 1 5質量0 /0であり、 好ましくは 0 . 5 ~ 1 0質量0 /0の範囲である。 その含有 量が 0 . 2質量%未満の場合、 せん断場における一時的粘度低下は小さく、 ェン ジンの低摩擦化には寄与しない。 また、 その含有量が 1 5質量%を超える場合、 エンジンの清浄性に悪影響を及ぼすため好ましくない。 2 is 1 5 mass 0/0, preferably from 0.5 to 1 0 mass range 0/0. When the content is less than 0.2% by mass, the temporary decrease in viscosity in a shearing field is small, and does not contribute to lowering the friction of the engine. If the content exceeds 15% by mass, the cleanliness of the engine is adversely affected, which is not preferable.
本発明における (E ) 成分である摩擦低減剤としては、 例えば、 炭素数 6〜 3 Examples of the friction reducing agent as the component (E) in the present invention include, for example, those having 6 to 3 carbon atoms.
0の直鎖状若しくは分枝状、 好ましくは直鎖状炭化水素基を有する、 ァミン化合 物、 脂肪酸エステル、 脂肪酸アミ ド、 脂^ 5酸金属塩等、 あるいは有機モリブデン 化合物、 及びこれらの任意混合物が挙げられる。 An amino compound, a fatty acid ester, a fatty acid amide, a metal salt of fatty acid pentaacid, or the like having a linear or branched, preferably linear hydrocarbon group of 0, or an organic molybdenum compound, or an arbitrary mixture thereof Is mentioned.
上記炭素数 6〜 3 0の直鎖状若しくは分枝状炭化水素基としては、具体的には、 へキシル基、 ヘプチル基、 ォクチル基、 ノエル基、 デシル基、 ゥンデシル基、 ド デシル基、 トリデシル基、 テトラデシル基、 ペンタデシル基、 へキサデシル基、 ヘプタデシル基、 ォクタデシル基、 ノナデシル基、 ィコシル基、 ヘンィコシル基、 ドコシル基、 トリコシル基、 テトラコシル基、 ペンタコシル基、 へキサコシル基、 ヘプタコシノレ基、 ォクタコシノレ基、 ノナコシノレ基、 ト リ アコンチノレ基等のァノレキ ル基 (これらアルキル基は直鎖状でも分枝状でもよい) ;へキセュル基、 ヘプテ -ノレ基、 オタテュル基、 ノネ-ノレ基、 デセニノレ基、 ゥンデセュノレ基、 ドデセ-ノレ 基、 トリデセニル基、 テトラデセエル基、 ペンタデセニル基、 へキサデセエル基、 ヘプタデセ-ル基、 ォクタデセニル基、 ノナデセニル基、 ィコセュル基、 ヘンィ コセェノレ基、 ドコセ二ノレ基、 トリコセェノレ基、 テトラコセニノレ基、 ペンタコセ二 ル基、 へキサコセ-ル基、 ヘプタコセニル基、 ォクタコセエル基、 ノナコセニル 基、 トリアコンテュル基等のァルケ-ル基 (これらァルケ-ル基は直鎖状でも分 枝状でもよく、 また二重結合の位置も任意である) ;等が例示できる。  Specific examples of the linear or branched hydrocarbon group having 6 to 30 carbon atoms include a hexyl group, a heptyl group, an octyl group, a noel group, a decyl group, a pendecyl group, a dodecyl group and a tridecyl group. Group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henycosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacoscinoleno group, octaconocoreno group Groups, such as carbonyl, triacontinole, etc. (these alkyl groups may be linear or branched); hexyl, hepte-nore, otatul, none-nore, deseninole, pendesenole, Dodecenyl group, tridecenyl group, tetradecel group, penta Senyl group, hexadeceyl group, heptadecenyl group, octadecenyl group, nonadecenyl group, icosulle group, heny cossenole group, docosenoline group, tricosenole group, tetracoseniole group, pentacosenyl group, heptacosenyl group, heptacosenyl group Alkacyl groups such as octacososel group, nonacosenyl group and triacontyl group (these alkaryl groups may be straight-chain or branched, and the position of the double bond is arbitrary).
ァミン化合物としては、 上記炭素数 6〜3 0の炭化水素基を有する脂肪族モノ ァミン、 脂肪族ポリアミン、 又はこれら脂肪族ァミンのアルキレンォキシド付加 物等が例示できる。  Examples of the amine compound include the above-mentioned aliphatic monoamine and aliphatic polyamine having a hydrocarbon group having 6 to 30 carbon atoms, and alkylene oxide adducts of these aliphatic amines.
脂肪酸エステルとしては、上記炭素数 6〜3 0の炭化水素基を有する脂肪酸と、 脂肪族 1価アルコール又は脂肪族多価アルコールとのエステル等が例示できる。 脂肪酸アミ ドとしては、 上記炭素数 6〜3 0の炭化水素基を有する脂肪酸と、 脂肪族モノアミン又は脂肪族ポリアミンとのアミ ド等が例示できる。 脂肪酸金属塩としては、 例えば、 上記炭素数 6〜 3 0の炭化水素基を有する脂 肪酸の、 アルカリ土類金属塩 (マグネシウム塩、 カルシウム塩等) や亜鉛塩等が 挙げられる。 Examples of the fatty acid ester include esters of the above fatty acid having a hydrocarbon group having 6 to 30 carbon atoms with an aliphatic monohydric alcohol or an aliphatic polyhydric alcohol. As the fatty acid amide, the above-mentioned fatty acid having a hydrocarbon group having 6 to 30 carbon atoms, Examples thereof include amides with aliphatic monoamines or aliphatic polyamines. Examples of the fatty acid metal salt include an alkaline earth metal salt (such as a magnesium salt and a calcium salt) and a zinc salt of the fatty acid having a hydrocarbon group having 6 to 30 carbon atoms.
これらのうちでは、 脂肪酸エステルが好ましく、 好ましい具体例としては、 グ リセリンモノォレートゃソルビタンモノォレート等が挙げられる。  Among these, fatty acid esters are preferable, and specific examples thereof include glycerin monoolate and sorbitan monoolate.
有機モリブデン化合物とし ! Sては、 例えば、 モリブデンジチォカーバメート系化 合物及ぴモリプデンジチォホスフェート等が挙げられる。 酸化安定性、 摩擦低減 効果に優れるモリブデンジチォカーバメート系化合物がより好ましく、 具体的に は、 例えば一般式 (9 ) で表されるものが挙げられる。  As an organic molybdenum compound! Examples of S include molybdenum dithiocarbamate compounds and molybdenum dithiophosphate. Molybdenum dithiocarbamate-based compounds having excellent oxidation stability and friction reducing effect are more preferable, and specific examples include those represented by the general formula (9).
Y Y2 33 YY 2 33
入 ll / sx Enter ll / s x
ノ Mo A Mo -→i (9) ノ Mo A Mo-→ i (9)
一般式 (9 ) において、 R 3 1 、 R 3 2 、 R 3 3及び R 3 4は、 それぞれ個別に、 炭化水素基(具体的には、炭素数 2〜 1 8のアルキル基又はアルキルァリール基) を示し、 Υ Υ 3及び丫4は、 それぞれ個別に、 S (硫黄原子) 又は Ο (酸 素原子) を示す。 In the general formula (9), R 3 1, R 3 2, R 3 3 and R 3 4 are each independently a hydrocarbon group (concretely, an alkyl group or an alkyl § reel with carbon number 2-1 8 Υ 3 and 丫4 each independently represent S (sulfur atom) or Ο (oxygen atom).
上記アルキル基には 1級アルキル基、 2級アルキル基又は 3級アルキル基が含 まれ、 これらは直鎖状でも分枝状でもよい。 好ましいアルキル基としては、 具体 的には、 ェチル基、 プロピル基、 ブチル基、 ペンチル基、 へキシル基、 ォクチル 基、 デシル基、 ドデシル基、 トリデシル基等のアルキル基 (これらアルキル基は 直鎖状でも分枝状でも良い) が例示できる。 また好ましいアルキルァリール基と しては、 具体的には、 プチルフエエル基、 ノニルフエニル基等のアルキルァリー ル基 (これらのアルキル基は直鎖状でも分枝状でも良い) が例示できる。  The alkyl group includes a primary alkyl group, a secondary alkyl group or a tertiary alkyl group, and these may be linear or branched. Preferable examples of the alkyl group include alkyl groups such as an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, an octyl group, a decyl group, a dodecyl group and a tridecyl group. Or may be branched). Specific examples of preferable alkylaryl groups include alkylaryl groups such as a butylphenyl group and a nonylphenyl group (these alkyl groups may be linear or branched).
好ましいモリブデンジチォカーバメート系化合物としては、 具体的には、 硫化 モリブデンジェチルジチォカーバメート、 硫化モリプデンジプロピルジチォカー バメート、 硫化モリブデンジブチルジチォカーバメート、 硫化モリブデンジペン チルジチォカーバメート、 硫化モリブデンジへキシルジチォカーバメート、 硫化 モリブデンジォクチルジチォカーバメート、 Preferred molybdenum dithiocarbamate compounds include, specifically, molybdenum sulfide getyl dithiocarbamate, molybdenum dipropyl dithiocarbamate, molybdenum dibutyl dithiocarbamate, molybdenum dipentyl dithiocarbamate, and molybdenum disulfide Xyldithiocarbamate, sulfurized Molybdenum dioctyl dicarbamate,
バメート、 硫化モリブデンジドデシルジチォカーバメート、 硫化モリブデンジト リデシルジチォカーバメート、 硫化モリプデンジ (プチルフエ二ル) ジチォカー バメート、 硫化モリプデンジ (ノユルフェニル) ジチォカーバメート、 硫化ォキ シモリブデンジェチルジチォカーバメート、 硫化ォキシモリブデンジプロピルジ チォカーバメート、 硫化ォキシモリブデンジブチルジチォカーバメート、 硫化ォ キシモリブデンジペンチルジチォカーバメート、 硫化ォキシモリブデンジへキシ ノレジチォカーバメート、 硫化ォキシモリブデンジォクチルジチォカーバメート、 硫化ォキシモリブデンジデシルジチォカーバメ一ト、 硫化ォキシモリブデンジド デシルジチォカーバメ一ト、 硫化ォキシモリプデンジトリデシルジチォカーバメ ート、 硫化ォキシモリブデンジ (ブチルフエエル) ジチォカーバメート、 硫化ォ キシモリブデンジ (ノユルフェニル) ジチォカーバメート等のモリブデンジチォ カーバメート (各アルキル基は直鎖状でも分枝状でも良い) 及びこれらの混合物 が例示できる。 Bamate, Molybdenum sulfide dodecyl dithiocarbamate, Molybdenum sulfide Ridecyl dithiocarbamate, Molybdenum sulfide (butylphenyl) dithiocarbamate Xymolybdenum dipropyl dithiocarbamate, oxymolybdenum dibutyl dithiocarbamate, oxymolybdenum dipentyl dithiocarbamate, oxymolybdenum dihexyl hexyl molybdenum dioctyl dithiocarbamate, oxymolybdenum dioctyl dithiocarbamate, oxymolybdenum disulfide Decyldithiocarbamate, oxymolybdenum sulfide Decyldithiocarbamate, oxymolybdenum ditridecyldithiocarbamate And molybdenum dithiocarbamates such as oxymolybdenum sulfide (butyl fuel) dithiocarbamate and oxymolybdenum sulfide (noylphenyl) dithiocarbamate (each alkyl group may be linear or branched) and mixtures thereof. it can.
これらの有機モリブデン化合物はスラッジの生成の核となり易いため、 清浄性 における長寿命化を重視すると、 上述の脂肪酸エステル等の無灰系摩擦低減剤を 使用することが特に好ましい。  Since these organic molybdenum compounds tend to be the core of sludge generation, it is particularly preferable to use the above-mentioned ashless friction reducing agent such as a fatty acid ester when emphasis is placed on extending the life in cleanliness.
本発明における (E ) 成分の含有量は、 組成物全量基準で、 0 . 0 5質量%以 上、 好ましくは 0 . 1質量%以上、 特に好ましくは 0 . 4質量%以上であり、 一 方、 その含有量は 3質量 °/0以下、 好ましくは 2 . 5質量%以下、 特に好ましくは 2質量%以下である。 その含有量が 0 . 0 5質量%未満の場合、 摩擦低減効果を 十分に発揮できず、 一方、 その含有量が 3質量。/。を超える場合、 酸化安定性の低 下ゃスラッジ生成の促進に寄与し、 それぞれ好ましくない。 The content of the component (E) in the present invention is at least 0.05 mass%, preferably at least 0.1 mass%, particularly preferably at least 0.4 mass%, based on the total amount of the composition. The content is 3% by mass / 0 or less, preferably 2.5% by mass or less, particularly preferably 2% by mass or less. When the content is less than 0.05% by mass, the effect of reducing friction cannot be sufficiently exerted, while the content is 3% by mass. /. If the ratio exceeds the above range, the oxidation stability will be reduced.
本発明の内燃機関用潤滑油組成物には、 更に (F ) アルカリ土類金属系清浄剤 が含有されていることが好ましい。 この (F ) 成分には、 アルカリ土類金属スル ホネート、 アルカリ土類金属フエネート及びアルカリ土類金属サリシレートが含 まれる。 本発明では、 これらからなる群より選ばれる少なくとも 1種のアルカリ 土類金属系清浄剤を使用することができる。  It is preferable that the lubricating oil composition for an internal combustion engine of the present invention further contains (F) an alkaline earth metal detergent. The component (F) includes an alkaline earth metal sulfonate, an alkaline earth metal phenate and an alkaline earth metal salicylate. In the present invention, at least one kind of alkaline earth metal detergent selected from the group consisting of these can be used.
アル力リ土類金属スルホネートとしては、 分子量 3 0 0〜 1 5 0 0、 好ましく は 4 0 0〜7 0 0のアルキル芳香族化合物をスルホン化することによって得られ  The alkaline earth metal sulfonate is obtained by sulfonating an alkyl aromatic compound having a molecular weight of 300 to 150, preferably 400 to 700.
5 るアルキル芳香族スルホン酸のアル力リ土類金属塩、 特にマグネシウム塩及び 又はカルシウム塩であり、 カルシウム塩が好ましく用いられる。 Five Alkali earth metal salts of alkyl aromatic sulfonic acids, particularly magnesium salts and / or calcium salts, and calcium salts are preferably used.
上記アルキル芳香族スルホン酸としては、 具体的にはいわゆる石油スルホン酸 や合成スルホン酸等が挙げられる。  Specific examples of the alkyl aromatic sulfonic acid include so-called petroleum sulfonic acid and synthetic sulfonic acid.
上記石油スルホン酸としては、 一般に鉱油の潤滑油留分のアルキル芳香族化合 物をスルホン化したものゃホワイ トオイル製造時に副生する、 いわゆるマホガ- 一酸等が用いられる。 また合成スルホン酸としては、 例えば洗剤の原料となるァ ルキルベンゼン製造プラントから副生したり、 ポリオレフインをベンゼンにアル キル化することにより得られる、 直鎖状や分枝状のアルキル基を有するアルキル ベンゼンをスノレホン化したもの、 あるいはジノニノレナフタレン等のァノレキノレナフ タレンをスルホン化したもの等が用いられる。 またこれらアルキル芳香族化合物 をスルホン化する際のスルホン化剤としては特に制限はないが、 通常発煙硫酸や 無水硫酸が用いられる。  As the above-mentioned petroleum sulfonic acid, generally, a so-called mahoga-monoacid or the like which is obtained by sulfonating an alkyl aromatic compound of a lubricating oil fraction of a mineral oil, which is by-produced during the production of white oil, is used. Examples of the synthetic sulfonic acid include an alkyl having a linear or branched alkyl group, which is obtained as a by-product from, for example, an alkylbenzene production plant used as a raw material for a detergent or obtained by alkylating polyolefin into benzene. A substance obtained by converting benzene to snorehon or a substance obtained by sulfonating anorequinolenaphthalene such as dinoninolenaphthalene is used. The sulfonating agent used for sulfonating these alkyl aromatic compounds is not particularly limited, but fuming sulfuric acid or sulfuric anhydride is usually used.
アルカリ土類金属フエネートとしては、 例えば、 アルキルフエノール、 アルキ ルフエノールサルフアイド、 アルキルフエノールのマン-ッヒ反応物のアル力リ 土類金属塩、 特にマグネシウム塩及び/又はカルシウム塩が挙げられる。 具体的 には、 下記一般式 (1 0 ) ~ ( 1 2 ) で表されるものを挙げることができる。  Alkaline earth metal phenates include, for example, alkyl phenols, alkyl phenol sulphides, alkaline earth metal salts of Mannich reactants of alkyl phenols, especially magnesium salts and / or calcium salts. Specific examples include those represented by the following general formulas (10) to (12).
Figure imgf000018_0001
上記一般式 (1 0 ) 、 (1 1 ) 、 及ぴ (1 2 ) において、 R R 4 2 R
Figure imgf000018_0001
In the general formulas (10), (11) and (12), RR42R
6 R44、 R45及び R46はそれぞれ同一でも異なっていてもよく、 それぞれ炭素数 4〜3 0、 好ましくは 6〜 1 8の直鎖又は分枝のアルキル基を示し、 M M2 及び M3は、.それぞれアル力リ土類金属、 好ましくはカルシウム及び/又はマグ ネシゥムを示し、 Xは 1または 2を示す。 6 R 44 , R 45 and R 46 may be the same or different, and each represents a linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18; MM 2 and M 3 are Each represents an alkaline earth metal, preferably calcium and / or magnesium, and X represents 1 or 2.
上記 R41、 R42、 R43、 R44、 R45及ぴ R46で表されるアルキル基として は、 具体的には、 ブチル基、 ペンチル基、 へキシル基、 ヘプチル基、 ォクチル基、 ノニル基、 デシル基、 ゥンデシル基、 ドデシル基、 トリデシル基、 テトラデシル 基、 ペンタデシル基、 へキサデシル基、 ヘプタデシル基、 ォクタデシル基、 ノナ デシル基、 ィコシル基、 ヘンィコシル基、 ドコシル基、 トリコシル基、 テトラコ シノレ基、 ペンタコシノレ基、 へキサコシル基、 ヘプタコシル基、 ォクタコシノレ基、 ノナコシル基、 及びトリアコンチル基等が挙げられる。 これらは直鎖でも分枝で もよい。 これらはまた 1級アルキル基、 2級アルキル基又は 3級アルキル基でも よい。 Specific examples of the alkyl group represented by R 41 , R 42 , R 43 , R 44 , R 45 and R 46 include a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, and a nonyl group. Group, decyl group, pendecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henicosyl group, docosyl group, tricosyl group, tetracosinole group, Examples include a pentacosinole group, a hexacosyl group, a heptacosyl group, an octacosinole group, a nonacosyl group, and a triacontyl group. These may be straight-chain or branched. These may also be primary, secondary or tertiary alkyl groups.
アルカリ土類金属サリシレートとしては、 例えば、 ァリキルサリチル酸のアル カリ土類金属塩、 特にマグネシウム塩及ぴ Z又はカルシウム塩が挙げられる。 具 体的には下記一般式 (1 3) で表されるものを挙げることができる。  Examples of the alkaline earth metal salicylate include alkali earth metal salts of arylalkyl salicylic acid, particularly, magnesium salt and Z or calcium salt. Specific examples include those represented by the following general formula (13).
Figure imgf000019_0001
一般式 ( 1 3) において、 R47は炭素数 4〜 3 0、 好ましくは 6〜1 8の直 鎖又は分枝のアルキル基を示し、 M4はアルカリ土類金属、 好ましくはカルシゥ ム及び/又はマグネシゥムを示す。
Figure imgf000019_0001
In the general formula (13), R 47 represents a linear or branched alkyl group having 4 to 30 carbon atoms, preferably 6 to 18 carbon atoms, and M 4 represents an alkaline earth metal, preferably calcium and / or calcium. Or shows magnetism.
上記 R47で表されるアルキル基としては、 具体的には、 ブチル基、 ペンチル 基、 へキシル基、 ヘプチル基、 ォクチル基、 ノニル基、 デシル基、 ゥンデシル基、 ドデシル基、 トリデシル基、 テトラデシル基、 ペンタデシル基、 へキサデシル基、 ヘプタデシル基、 ォクタデシル基、 ノナデシル基、 ィコシル基、 ヘンィコシル基、 ドコシル基、 トリコシル基、 テトラコシル基、 ペンタコシル基、 へキサコシル基、 ヘプタコシノレ基、 ォクタコシル基、 ノナコシル基、 トリアコンチル基等が挙げら れ、 これらは直鎮でも分枝でもよい。 これらはまた 1級アルキル基、 2級アルキ Specific examples of the alkyl group represented by R 47 include a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a pendecyl group, a dodecyl group, a tridecyl group, and a tetradecyl group. , Pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group, henycosyl group, docosyl group, tricosyl group, tetracosyl group, pentacosyl group, hexacosyl group, heptacosinole group, octacosyl group, nononacosyl group Etc., which may be direct or branched. These are also primary alkyl groups, secondary alkyl groups
7 ル基又は 3級アルキル基でもよい。 7 Or a tertiary alkyl group.
アル力リ土類金属スルホネート、 アル力リ土類金属フエネート及びアル力リ土 類金属サリシレートには、 上記のアルキル芳香族スルホン酸、 アルキルフエノー ノレ、 ァノレキノレフェノーノレサノレファィ ド、 ァノレキルフエノーノレのマン-ッヒ反応物、 アルキルサリチル酸等を直接、 マグネシゥム及び Z又はカルシウムのアル力リ土 類金属の酸化物や水酸化物等のアルカリ土類金属塩基と反応させたり、 又は一度 ナトリゥム塩や力リゥム塩等のアルカリ金属塩としてからアル力.リ土類金属塩と 置換させること等により得られる中性 (正塩) アルカリ土類金属スルホネート、 中性 (正塩) アルカリ土類金属フ ネート及ぴ中性 (正塩) アルカリ土類金属サ リシレート ;あるいは中性アルカリ土類金属スルホネート、 中性アルカリ土類金 属フエネート及ぴ中性アル力リ土類金属サリシレートと過剰のアルカリ土類金属 塩やアル力リ土類金属塩基を水の存在下で加熱することにより得られる塩基性ァ ルカリ土類金属スルホネート、 塩基性アル力リ土類金属フエネート及び塩基性ァ ルカリ土類金属サリシレート ;更には中性アルカリ土類金属スルホネート、 中性 アル力リ土類金属フヱネート及び中性アル力リ土類金属サリシレートの存在下で、 アルカリ土類金属の水酸化物と炭酸ガス又はホウ酸とを反応させることにより得 られる過塩基性 (超塩基性) アルカリ土類金属スルホネート、 過塩基性 (超塩基 性) アルカリ土類金属フ ネート及び過塩基性 (超塩基性) アルカリ土類金属サ リシレートも含まれる。  The alkaline earth metal sulfonates, alkaline earth metal phenates and alkaline earth metal salicylates include the above-mentioned alkyl aromatic sulfonic acids, alkylphenols, phenols, and phenols. The reaction of the Mannoch reactant, alkyl salicylic acid, etc. of the phenolic phenol, directly with magnesium and alkaline earth metal bases such as oxides and hydroxides of alkaline earth metals of Z or calcium. Neutral (normal salt) Alkaline earth metal sulfonate, neutral (normal salt) obtained by substituting an alkaline metal salt such as sodium salt or potassium salt with alkaline earth metal salt Alkaline earth metal phenate and neutral (normal salt) Alkaline earth metal salicylate; or neutral alkaline earth metal sulfonate, neutral alkali Alkaline earth metal phenate and basic alkaline earth metal salicylate and basic alkaline earth obtained by heating excess alkaline earth metal salt and alkaline earth metal base in the presence of water Metal-sulfonates, basic alkaline earth metal phenates and basic alkaline earth metal salicylates; furthermore, neutral alkaline earth metal sulfonates, neutral alkaline earth metal phenates and neutral alkaline earth metals Overbased (ultrabasic) alkaline earth metal sulfonate, overbased (ultrabasic) obtained by reacting alkaline earth metal hydroxide with carbon dioxide or boric acid in the presence of metal salicylate ) Includes alkaline earth metal phthalates and overbased (ultrabasic) alkaline earth metal salicylates.
本発明においては、 上記の中性アルカリ土類金属塩、 塩基性アルカリ土類金属 塩、 過塩基性 (超塩基性) アルカリ土類金属塩及びこれらの混合物等を用いるこ とができる。 これらの中でも、 長期間に渡る清浄性を維持する観点から、 過塩基 性カルシウムスルホネートと過塩基性カルシウムフエネートとを組み合わせたも の、 あるいは過塩基性カルシウムサリシレートを使用することが好ましい。 過塩 基性カルシウムサリシレートは、 低燃費性、 酸化安定性にも優れるため特に好ま しい。  In the present invention, the above-mentioned neutral alkaline earth metal salts, basic alkaline earth metal salts, overbased (ultrabasic) alkaline earth metal salts, and mixtures thereof can be used. Among these, it is preferable to use a combination of an overbased calcium sulfonate and an overbased calcium phenate or an overbased calcium salicylate from the viewpoint of maintaining the cleanliness for a long period of time. Superbasic calcium salicylate is particularly preferred because of its excellent fuel efficiency and oxidation stability.
金属系清浄剤は、通常、軽質潤滑油基油等で希釈された状態で市販されており、 また入手可能であるが、 一般的にその金属含有量が 1 . 0〜2 0質量%、 好まし くは 2 . 0〜 1 6質量0 /0のものを用いる。 The metal-based detergent is usually commercially available in a diluted state with a light lubricating base oil or the like, and is available, but generally has a metal content of 1.0 to 20% by mass. better rather is used as of 2.0 to 1 6 mass 0/0.
本発明で用いるアルカリ土類金属系清浄剤の全塩基価は任意であるが、 通常、 全塩基価が 5 0 O m g K O H/ g以下、 好ましくは 1 5 0〜4 5 O m g K O H/ gのものを用いる。 全塩基価は、 J I S 2 5 0 1 ( 1 9 9 2 ) の 「石油製品 及び潤滑油一中和価試験方法」 の 7 . に準拠して測定される過塩素酸法による全 塩基価を意味する。 Although the total base number of the alkaline earth metal detergent used in the present invention is optional, Those having a total base number of 50 O mg KOH / g or less, preferably 150 to 45 O mg KOH / g, are used. The total base number means the total base number by the perchloric acid method, which is measured in accordance with JIS 2501 (1992), "Petroleum products and lubricating oils-Neutralization number test method 7". I do.
本発明におけるアルカリ土類金属系清浄剤 ( F ) の含有量は、 通常組成物全量 基準で 1 0質量%以下であり、 好ましくは 0 . 1〜 1 0質量 °/ο、 更に好ましくは 0 . 5〜8質量%、 更により好ましくは 1〜 5質量%である。  The content of the alkaline earth metal detergent (F) in the present invention is usually 10% by mass or less based on the total amount of the composition, preferably 0.1 to 10% by mass, more preferably 0.1 to 10% by mass. It is 5 to 8% by mass, still more preferably 1 to 5% by mass.
本発明における内燃機関用潤滑油組成物はそのままでも長期間に渡って清浄性 に優れ、 低燃費性に優れるものであるが、 さらにその性能を向上させるために、 その目的に応じて潤滑油に一般的に使用されている任意の添加剤を含有させるこ とができる。 このような添加剤としては、 例えば、 (Β ) 成分以外の無灰分散剤、 摩耗防止剤、 (C ) 成分以外の酸化防止剤、 腐食防止剤、 防鲭剤、 抗乳化剤、 金 属不活性化剤、 消泡剤、 着色剤等の添加剤等を挙げることができる。  The lubricating oil composition for an internal combustion engine according to the present invention is excellent in cleanliness and fuel economy over a long period of time as it is, but in order to further improve its performance, the lubricating oil is used in accordance with its purpose. Any commonly used additive can be contained. Such additives include, for example, ashless dispersants other than component (I), antiwear agents, antioxidants other than component (C), corrosion inhibitors, antioxidants, demulsifiers, metal deactivators. And additives such as an antifoaming agent and a coloring agent.
( Β ) 成分以外の無灰分散剤としては、 重量平均分子量が 6 5 0 0未満である アルキル基又はアルケ-ル基を有するコハク酸イミ ド及びその誘導体、 炭素数 4 0〜4 0 0のアルキル基又はアルケュル基を有するベンジルァミン若しくはポリ ァミン並びにこれらの誘導体等が挙げられる。 これらの誘導体としては、 上記コ ハク酸イミ ドゃベンジルァミン、ポリアミン等に前述のようなホウ素含有化合物、 前述のような含酸素有機化合物等を作用させたものが挙げられる。  Examples of the ashless dispersant other than the component (II) include succinic acid imide having an alkyl group or an alkyl group having a weight average molecular weight of less than 600 and derivatives thereof, and alkyl having 40 to 400 carbon atoms. Or a benzylamine or a polyamine having an alkyl group or a derivative thereof. Examples of these derivatives include those obtained by allowing the above-mentioned boron-containing compound, the above-described oxygen-containing organic compound, or the like to act on the above-mentioned imido-dibenzylamine succinate, polyamine or the like.
摩耗防止剤としては、 リン酸エステル、 亜リン酸エステル及びこれらのァミン 塩、 ジアルキルジチォリン酸亜鉛、 ジアルキルチオリン酸亜鉛、 ジアルキルリン 酸亜鉛等のリン系化合物、ジアルキルジチォ力ルバミン酸亜鉛、ジスルフィ ド類、 硫化ォレフィン類、 硫化油脂類等の硫黄系化合物等及びこれらの任意混合物等が 挙げられる。  Examples of antiwear agents include phosphoric acid esters, phosphites and their amine salts, zinc compounds such as zinc dialkyldithiophosphate, zinc dialkylthiophosphate, zinc dialkylphosphate, zinc dialkyldithiophosphate, disulfide and the like. , Sulfurized oils, sulfurized compounds such as sulfurized oils and the like, and arbitrary mixtures thereof.
( C ) 成分以外の酸化防止剤としては、 アルキルジチォカルバミン酸エステル 等が挙げられる。  Examples of the antioxidant other than the component (C) include an alkyldithiocarbamate and the like.
腐食防止剤としては、 ベンゾトリアゾール系、 ト リルトリアゾール系、 チアジ ァゾール系、 ィミダゾール系化合物等が挙げられる。  Examples of the corrosion inhibitor include benzotriazole-based, tolyltriazole-based, thiaziazole-based, and imidazole-based compounds.
防鲭剤としては、 多価アルコールエステル、 石油スルホネート、 アルキルベン ゼンスルホネート、 ジノニルナフタレンスルホネート、 アルケニルコハク酸エス テル、 多価アルコールエステル等が挙げられる。 Examples of protective agents include polyhydric alcohol esters, petroleum sulfonates, alkylbenzenesulfonates, dinonylnaphthalene sulfonates, and alkenyl succinates. And polyhydric alcohol esters.
抗乳化剤としては、 ポリオキシエチレンアルキルエーテル、 ポリオキシェチレ ンアルキルフエ-ルエーテル、 ポリォキシエチレンアルキルナフチルエーテル等 のポリアルキレングリコール系非イオン系界面活性剤等が挙げられる。  Examples of demulsifiers include polyalkylene glycol-based nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl ether, and polyoxyethylene alkyl naphthyl ether.
金属不活性化剤としては、 イミダゾリン、 ピリミジン誘導体、 アルキルチアジ ァゾール、 メルカプトべンゾチアゾール、 ベンゾトリァゾール又はその誘導体、 Examples of the metal deactivator include imidazoline, a pyrimidine derivative, an alkylthiazole, a mercaptobenzothiazole, a benzotriazole or a derivative thereof,
1 , 3, 4ーチアジアゾールポリスルフイ ド、 1 , 3, 4—チアジアゾリルー 2, 5—ビスジァノレキルジチォカーバメート、 2— (ァノレキ ジチォ) ベンゾイミダ ゾール、 一 ( o —カルボキシベンジルチオ) プロピオンュトリル等が挙げられ る。 1,3,4-thiadiazole polysulfide, 1,3,4-thiadiazolyl 2,5-bisdianolecyldithiocarbamate, 2- (anolexidithio) benzimidazole, mono (o-carboxybenzylthio) propione Tolyl and the like.
消泡剤としては、 シリコーン、 フルォロシリコーン、 フルォロアルキルエーテ ル等が挙げられる。  Examples of the antifoaming agent include silicone, fluorosilicone, and fluoroalkyl ether.
これらの添加剤を本発明の内燃機関用潤滑油組成物に含有させる場合には、 そ の含有量は通常組成物全量基準で、 (B ) 成分以外の無灰分散剤では、 0 . 0 1 〜1 0質量%、 摩耗防止剤、 (C ) 成分以外の酸化防止剤、 腐食防止剤、 防鲭剤、 抗乳化剤ではそれぞれ 0 . 0 1 ~ 5質量%、 金属不活性化剤では 0 . 0 0 5〜 1 質量%、 消泡剤では 0 . 0 0 0 5〜 1質量%の範囲で選ばれる。  When these additives are contained in the lubricating oil composition for an internal combustion engine of the present invention, the content thereof is usually based on the total amount of the composition, and the content of the ashless dispersant other than the component (B) is from 0.01 to 0.1%. 10% by mass, 0.1 to 5% by mass for antioxidants, corrosion inhibitors, antioxidants, and demulsifiers other than component (C), and 0.05% for metal deactivators. It is selected in the range of 5 to 1% by mass, and 0.0005 to 1% by mass for the antifoaming agent.
本発明の内燃機関用潤滑油組成物は、 二輪車、 四輪車、 発電用、 舶用等のガソ リンエンジン、 ディーゼルエンジン、 ガスエンジン等の内燃機関用潤滑油として 好ましく使用することができるが、 その他長期間に渡って清浄性能や低燃費性能 が要求される潤滑油、 例えば自動又は手動変速機等の駆動系用潤滑油、 湿式ブレ ーキ、油圧作動油、ター ン油等の潤滑油としても好適に使用することができる。  The lubricating oil composition for an internal combustion engine of the present invention can be preferably used as a lubricating oil for an internal combustion engine such as a gasoline engine, a diesel engine, a gas engine, etc. for motorcycles, automobiles, power generation, ships, etc. Lubricating oils that require cleanliness and fuel efficiency over a long period of time, such as lubricating oils for drive systems such as automatic or manual transmissions, wet brakes, hydraulic oils, and turn oils It can be suitably used.
[産業上の利用分野] [Industrial applications]
本発明の内燃機関用潤滑油組成物は、 低燃費 (省燃費) 性能に優れており、 か つ従来の長寿命油に比べ更に長時間に渡る清浄性の維持性能をも併有する。 従つ て本発明の潤滑油組成物を用いることで廃油の低減と炭酸ガスの排出量の低減が 可能である。 [発明を実施するための最良の形態] INDUSTRIAL APPLICABILITY The lubricating oil composition for an internal combustion engine of the present invention is excellent in low fuel consumption (fuel saving) performance, and also has the ability to maintain cleanliness for a longer time than conventional long-life oils. Therefore, by using the lubricating oil composition of the present invention, it is possible to reduce waste oil and carbon dioxide emissions. [Best Mode for Carrying Out the Invention]
以下、 本発明の内容を実施例及び比較例によってさらに具体的に説明するが、 本発明はこれらの実施例になんら限定されるものではない。  Hereinafter, the content of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.
(実施例 1~4、 比較例 1〜7) (Examples 1-4, Comparative Examples 1-7)
表 1〜3に示すように、 本発明の内燃機関用潤滑油組成物 (実施例 1〜4) 、 及び比較として本発明の要件を満たさない組成物 (比較例 1〜 7) を調製した。 これらの組成物の粘度グレードはすべて 5 W— 30油とした。  As shown in Tables 1 to 3, lubricating oil compositions for internal combustion engines of the present invention (Examples 1 to 4) and compositions not satisfying the requirements of the present invention for comparison (Comparative Examples 1 to 7) were prepared. The viscosity grades of these compositions were all 5 W-30 oils.
実施例及び比較例で得た内燃機関用潤滑油油の性能を以下に示す性能評価試験 により評価した。 その評価結果を表 1〜 3に示す。  The performance of the lubricating oils for internal combustion engines obtained in Examples and Comparative Examples was evaluated by performance evaluation tests described below. Tables 1 to 3 show the evaluation results.
( 1 ) 清浄性試験: JASO VG20 E清浄性試験 (改)  (1) Cleanliness test: JASO VG20 E cleanliness test (revised)
社団法人 自動車技術会規格 (JASO M3 3 1— 9 1) に規定されている 自動車ガソリン機関潤滑油の清浄性試験法に準拠し、 エンジン右側口ッカーカバ 一のスラッジ評点を 50時間毎に評価し、 当該評点が 9. 0以下になるまで試験 を継続実施した。 なお、 当該清浄性試験法は通常 300時間後のスラッジ評点を 評価し、 これが 9. 0以上である場合ハイグレードエンジン油として判定される。 従って従来の長寿命エンジン油の当該評点が 9.0以下となるまでの試験時間は、 300〜 400時間程度である。 本発明においては、 500時間以上を清浄性評 価の要求性能とした。  The sludge rating of the right side cover of the engine was evaluated every 50 hours in accordance with the automobile engine gasoline engine lubricating oil cleanliness test method specified in the Japan Society of Automotive Engineers Standards (JASO M3 31—91). The test was continued until the score fell below 9.0. In addition, this cleanliness test method usually evaluates the sludge score after 300 hours, and if it is 9.0 or more, it is judged as high grade engine oil. Therefore, the test time for the conventional long-life engine oil until the rating becomes 9.0 or less is about 300 to 400 hours. In the present invention, 500 hours or more was regarded as the required performance of the cleanliness evaluation.
(2) 低燃費性試験  (2) Low fuel consumption test
10 ■ 1 5モード燃費を測定し、 市販 SG級 5W— 30油を標準油としたとき の試験油の燃費改善率を評価した。 本試験では、 1 %以上を低燃費 (省燃費) 性 評価の要求性能とした。 表 1〜 3に示す結果から明らかなように、本発明の内燃機関用潤滑油組成物(実 施例 1〜 4 ) は、 従来の 300〜 400時間程度の清浄性維持性を示す長寿命ェ ンジン油と比べ.2倍程度あるいはそれ以上の長期間にわたって清浄性に優れ、 か つ省燃費性にも優れている。 特に金属系清浄剤にカルシウムサリシレートを使用 した場合には、 更に良好な清浄性の維持性及び省燃費性を示す。  10 ■ 15 mode fuel economy was measured, and the fuel economy improvement rate of the test oil was evaluated when a commercial SG class 5W-30 oil was used as the standard oil. In this test, 1% or more was set as the required performance for fuel efficiency (fuel saving) evaluation. As is clear from the results shown in Tables 1 to 3, the lubricating oil composition for an internal combustion engine of the present invention (Examples 1 to 4) has a long life of 300 to 400 hours. It excels in cleanliness over a long period of time, about twice or more compared to engine oil, and also has excellent fuel economy. In particular, when calcium salicylate is used as a metal-based detergent, more excellent maintainability of cleanliness and fuel economy are exhibited.
一方、 (A)成分として芳香族分が請求範囲よりも多い鉱油を使用した場合(比 較例 1) は、 清浄性の維持性、 省燃費性共に劣っている。 (B) 成分として重量 平均分子量が請求範囲よりも小さいコハク酸イミ ドを使用した場合 (比較例 2 : 従来の長寿命エンジン油に相当) 、 清浄性の維持性、 省燃費性共に本発明の組成 物よりも劣っている。 比較例 2の組成物にさらに Mo DTCを配合した場合 (比 較例 3) 、 省燃費性は向上するものの清浄性の維持性は劣っている。 比較例 3の 組成物のコハク酸ィミ ドのかわりに重量平均分子量が請求範囲よりも小さいホウ 素含有コハク酸イミ ドを使用した場合 (比較例 4) 、 (B) 成分の含有量が請求 範囲よりも少ない場合 (比較例 5) 、 そして (C) 成分として酸化防止剤の含有 量が請求範囲よりも少ない場合(比較例 6) には、 いずれも清浄性に劣っている。 また (D) 成分として粘度指数向上剤の重量平均分子量が請求範囲よりも小さい 場合 (比較例 7) には、 省燃費性に劣っている。 On the other hand, when mineral oil having an aromatic content higher than the claimed range is used as the component (A) Comparative Example 1) is inferior in both maintainability of cleanliness and fuel efficiency. (B) When succinic acid imide having a weight average molecular weight smaller than the claimed range is used as the component (Comparative Example 2: equivalent to a conventional long-life engine oil), both of the cleanliness retention and the fuel economy are the same as those of the present invention. Inferior to composition. When Mo DTC was further added to the composition of Comparative Example 2 (Comparative Example 3), the fuel economy was improved but the maintainability of cleanliness was poor. When a boron-containing succinic acid imid having a weight average molecular weight smaller than the claimed range was used instead of the succinic acid imid of the composition of Comparative Example 3 (Comparative Example 4), the content of the component (B) was reduced. When the content is less than the range (Comparative Example 5) and when the content of the antioxidant as the component (C) is less than the claimed range (Comparative Example 6), the cleanliness is inferior. Further, when the weight average molecular weight of the viscosity index improver as the component (D) is smaller than the claimed range (Comparative Example 7), the fuel economy is poor.
表 1 table 1
Figure imgf000025_0001
Figure imgf000025_0001
1 )動粘度 (100°C) : 4.3mm2/s,芳香族分: 1.7質量 %,粘度指数: 126 1) Kinematic viscosity (100 ° C): 4.3mm 2 / s, aromatics: 1.7 mass%, viscosity index: 126
2)動粘度 (100°C〉:4.3mm2/s,芳香族分 : 21.9質量%,粘度指数: 102 2) Kinematic viscosity (100 ° C): 4.3 mm 2 / s, aromatic content: 21.9% by mass, viscosity index: 102
3)重量平均分子量 (Mw):約 9800、窒素含有量: 1.8質量。/。、ホウ素含有量: 0.5質量% 3) Weight average molecular weight (Mw): about 9800, nitrogen content: 1.8 mass. /. , Boron content: 0.5% by mass
4)重量平均分子量 (Mw) :約 13700、窒素含有量: 1.8質量%、ホウ素含有量: 0.0質量%4) Weight average molecular weight (Mw): about 13700, nitrogen content: 1.8 mass%, boron content: 0.0 mass%
5)重量平均分子量 (Mw) :約 5300、窒素含有量: 2.9質量%、ホウ素含有量: 0.0質量%5) Weight average molecular weight (Mw): about 5300, nitrogen content: 2.9% by mass, boron content: 0.0% by mass
6)重量平均分子量 (Mw):約 6100、窒素含有量: 3.0質量%、ホウ素含有量: 1.0質量%6) Weight average molecular weight (Mw): about 6100, nitrogen content: 3.0% by mass, boron content: 1.0% by mass
7)ォクチルー 3—(3, 5—ジ一 t—プチルー 4ーヒドロキシフエニル)プロピオネート7) Octyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate
8)アルキルジフエニルァミン (アルキル基は C4と G8の混合物〉、窒素含有量: 4.5質量%8) Alkyl diphenylamine (alkyl group is a mixture of C4 and G8), nitrogen content: 4.5% by mass
9)分散型ポリメタクリレート系、重量平均分子量:約 800,000 9) Dispersion type polymethacrylate, weight average molecular weight: about 800,000
10)分散型ポリメタクリレート系、重量平均分子量:約 300,000  10) Dispersion type polymethacrylate, weight average molecular weight: about 300,000
1 1 )グリセリンモノォレート  1 1) Glycerin monolate
12) Mo含有量 4.6質量%  12) Mo content 4.6 mass%
13) Ga含有量 12.3質量%、全塩基価: 300mgKOH/g  13) Ga content 12.3% by mass, total base number: 300mgKOH / g
14) Ga含有量 9.4質量%、全塩基価: 260mgKOH/g 14) Ga content 9.4 mass%, total base number: 260m g KOH / g
15) Ca含有量 6.8質量%、全塩基価: 180mgKOH/g  15) Ca content 6.8% by mass, total base number: 180mgKOH / g
1 6)その他の添加剤;ジアルキルジチォリン酸亜鉛、流動点降下剤、消泡剤など 表 2 1 6) Other additives; zinc dialkyldithiophosphate, pour point depressant, defoamer, etc. Table 2
Figure imgf000026_0001
Figure imgf000026_0001
1)~16)は表 1と同じ 1) to 16) are the same as Table 1
JP02/06689 JP02 / 06689
表 3 Table 3
Figure imgf000027_0001
Figure imgf000027_0001
1)〜16)は表 1と同じ  1) to 16) are the same as Table 1

Claims

請 求 の 範 囲 The scope of the claims
1. (A) 1 00°Cにおける動粘度が 2〜8mm2Zsで全芳香族含有 量が 1 5質量。 /0以下の鉱油及ぴノ又は合成油からなる基油に、組成物全量基準で、1. (A) The kinematic viscosity at 100 ° C. is 2 to 8 mm 2 Zs and the total aromatic content is 15 mass. / 0 or less base oil consisting of mineral oil and synthetic oil or synthetic oil, based on the total amount of the composition,
(B) 重量平均分子量が 6 500以上のポリブテニルコハク酸イミド及び/又は その誘導体を 2〜1 5質量%、 (C) フエノール系及び Z又はアミン系無灰酸化 防止剤を 0. 2〜5質量%、 (D) 重量平均分子量が 400000以上の粘度指 数向上剤を 0. 2〜 1 5質量。/。、 及び (E) 摩擦低減剤を 0. 05~3質量%含 有してなることを特徴とする内燃機関用潤滑油組成物。 (B) 2 to 15% by mass of a polybutenyl succinimide having a weight average molecular weight of 6500 or more and / or a derivative thereof; 5% by mass, (D) 0.2 to 15% by mass of a viscosity index improver having a weight average molecular weight of 400,000 or more. /. And (E) a lubricating oil composition for an internal combustion engine, comprising 0.05 to 3% by mass of a friction reducing agent.
2. (F) アルカリ土類金属スルホネート、 アルカリ土類金属フエネー ト及びアル力リ土類金属サリシレートからなる群より選ばれる少なくとも 1種の アルカリ土類金属系清浄剤がさらに含有されていることを特徴とする請求項 1に 記載の内燃機関用潤滑油組成物。 2. (F) At least one alkaline earth metal detergent selected from the group consisting of alkaline earth metal sulfonates, alkaline earth metal phenates, and alkaline earth metal salicylates. The lubricating oil composition for an internal combustion engine according to claim 1, wherein:
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