WO2008093446A1 - Lubricant oil composition - Google Patents

Lubricant oil composition Download PDF

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WO2008093446A1
WO2008093446A1 PCT/JP2007/066696 JP2007066696W WO2008093446A1 WO 2008093446 A1 WO2008093446 A1 WO 2008093446A1 JP 2007066696 W JP2007066696 W JP 2007066696W WO 2008093446 A1 WO2008093446 A1 WO 2008093446A1
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group
preferably
lubricating oil
viscosity
oil composition
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PCT/JP2007/066696
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French (fr)
Japanese (ja)
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Teppei Tsujimoto
Akira Yaguchi
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Nippon Oil Corporation
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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
    • C10M167/00Lubricating compositions characterised by the additive being a mixture of a macromolecular compound, a non-macromolecular compound and a compound of unknown or incompletely defined constitution, each of these compounds being essential
    • 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
    • C10M2203/102Aliphatic fractions
    • C10M2203/1025Aliphatic fractions 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
    • C10M2203/00Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/106Naphthenic fractions
    • C10M2203/1065Naphthenic fractions 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
    • C10M2205/04Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing aromatic monomers, e.g. styrene
    • 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
    • C10M2207/027Neutral salts thereof
    • 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
    • C10M2209/00Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084Acrylate; Methacrylate
    • 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
    • C10M2215/06Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064Di- and triaryl 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
    • C10M2215/086Imides
    • 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
    • C10M2219/00Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/046Overbasedsulfonic acid salts
    • 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
    • C10M2223/00Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04Phosphate esters
    • C10M2223/042Metal salts thereof
    • 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
    • C10N2210/00Nature of the metal present as such or in compounds, i.e. in salts
    • C10N2210/02Group II, e.g. Mg, Ca, Ba, Zn, Cd, Hg
    • 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
    • C10N2220/00Specified physical or chemical properties or characteristics, i.e. function, of single compounds in lubricating compositions
    • C10N2220/02Physico-chemical properties
    • C10N2220/033Shear stability
    • 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
    • C10N2230/00Specified physical or chemical properties of lubricating compositions
    • C10N2230/02Viscosity or 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
    • C10N2230/00Specified physical or chemical properties of lubricating compositions
    • C10N2230/06Resistance to extreme pressure; Oiliness; Abrasion resistance; Friction; Anti-wear
    • 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
    • C10N2230/00Specified physical or chemical properties of lubricating compositions
    • C10N2230/40Low content or no content compositions
    • C10N2230/45Ashless or low ash content
    • 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
    • C10N2230/00Specified physical or chemical properties of lubricating compositions
    • C10N2230/68Shear stability
    • 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
    • C10N2230/00Specified physical or chemical properties of lubricating compositions
    • C10N2230/74Noack Volatility

Abstract

A lubricant oil composition that among those of the same viscosity grade, attains a further reduction of lubrication resistance to thereby enhance the energy saving performance of lubricant. The lubricant oil composition is characterized in that a lubricant base oil is blended with a viscosity index improver of 30 or below PSSI so that the viscosity index of the composition is 160 or higher and so that the ratio of 100°C kinematic viscosity drop after shear thereof is 15% or below.

Description

Akira fine manual lubrication oil group formed products

[Technical field]

The present invention relates to lubricating oil compositions, and more particularly relates to a lubricating oil composition which can enhance the energy saving performance of the lubricating oil by reducing lubrication resistance, more particularly a lubricating oil for an internal combustion engine SAE xW- 30 grade , especially suitable for diesel engine oils, to a higher Mel is lubrication oil composition the lubricant drag reduction to fuel saving performance at the same viscosity grade.

[Background Art]

The engine oil from the viewpoint of environmental problems such as carbon dioxide emissions have been required to be on improvement of fuel efficiency performance. Therefore, formulation of such friction modifiers or high molecular weight viscosity index improvers, such as Mo DTC (e.g., Patent Document 1) and a low viscosity and high viscosity index of the lubricating oil has been developed. Here, friction reducing agents such as Mo DTC, when soot contamination, such as diesel engine oils is high, because the friction reducing effect is significantly inhibited, poor persistence of fuel efficiency performance, the friction modifier relying not basic formulation, i.e., improved viscosity reduction and viscosity index of the lubricating oil is important.

However, in the lubricating oil used in severe sliding conditions as diesel engine oils, low viscosity is increased and the wear at the sliding portion, acceleration of deterioration due to an increase in evaporation loss, the exhaust gas property since the cause of the deterioration, SAE xW_ 20 low viscosity, such as grade (e.g., Patent Document 2) is difficult, especially in SAE (xW-) 30 grade or viscosity grade is therefore diesel E down Gin oil improvements are proceeding Me.

The fuel efficiency performance improvement of a lubricating oil, the most common is high viscosity index of the low viscosity and the composition of the base oil viscosity, estimated kinematic viscosity reduction after shearing, high molecular weight polymethacrylate Li Le - DOO system it is most effective to some extent large amount of viscosity index improver. However, kinematic viscosity reduction rate after the shearing of such cases to become usually approximately 20% or more, in order to maintain the same viscosity grade even after shearing, preset in increasing the kinematic viscosity of the composition it was necessary keep. When using such a method, to improve fuel economy in all the process of long-term use from the initial period is limited.

(1) Patent Document 1: JP-A-8 3023 78 No.

(2) Patent Document 2: JP 2001 _ 1 8 1 664 JP

[Disclosure of the Invention]

An object of the present invention has been made in view of the circumstances as described above, the lubricating oil composition further reduce lubrication resistance at the same viscosity grade can be further improved energy efficiency of the lubricating oil, for example SAE xW- 30 grade internal combustion engine lubricating oil is in particular to provide a diesel engine oil lubrication resistance can be reduced to improve the fuel efficiency performance of the lubricating oil composition.

The present inventors have made intensive studies in order to solve the above problems, in the lubricating oil of the same viscosity grade, to increase the viscosity index of the composition to a specific or higher, constant viscosity reduction rate after the shearing of the composition by blending a viscosity index improver so that the level below, found to be able to improve the above problems, and have completed the present invention. That is, the present invention is a lubricating oil base oil, PSSI the 30 following viscosity index improvers, viscosity index of 1 60 or more compositions, cut 1 00 ° C kinematic viscosity reduction rate after shear is 1 5% a lubricating oil composition characterized by being blended so that.

Further, the present invention, the viscosity index improver is, regarding to the lubricating oil composition characterized by PSSI of 30 or less of styrene temporary Enkoporima based viscosity index improver.

Further, the present invention, the viscosity index improver, to the lubricating oil composition characterized by PSSI of 1 5 less polymethacrylic rate based viscosity index improver. The present invention also relates to the lubricating oil composition characterized by 1 00 ° CTB S viscosity of the composition is less than 7mP a · s.

Further, the present invention is 1 00 kinematic viscosity of the composition 9. 3~: 1 1. 0mm 2 Z s, 4 0. A C kinematic viscosity 40~6 Omm 2 // s, related to the lubricating oil composition 1 00 ° C kinematic viscosity after shear is equal to or 9. is 3 mm 2 Zs or more.

The present invention also relates to pre-Symbol lubricating oil composition etc., characterized in that it contains a metal salt of a phosphorus acid ester. Further, the present invention is a metallic detergent, about the lubricating oil composition characterized by containing ashless dispersants and antioxidants.

Further, the present invention is sulfuric ash content of the composition is from 0.1 to 2 wt. Relating to the lubricating oil composition, characterized in that I is a.

[Effect of the invention]

The lubricating oil composition of the present invention, as a lubricating oil for internal combustion engine, it is possible that the same viscosity grade odor Te to reduce its lubricating resistance increase the fuel efficiency performance.

BEST MODE FOR CARRYING OUT THE INVENTION

Below, the present invention will be described in detail.

The lubricating base oil in the lubricating oil composition of the present invention, the mineral base oil Ru are used in conventional lubricating oils and / or synthetic base oils can be used.

The mineral base oil, specifically, the lubricating oil fraction obtained by reduced pressure distillation of atmospheric residue oil obtained by atmospheric distillation of crude oil, solvent deasphalting, solvent extraction, hydrocracking , solvent dewaxing, catalytic dewaxing, hydrorefining, those that have been purified by performing sulfuric acid cleaning, one or more processing clay treatment or the like, or slack wax, GTL WA X (gas produced by Fi Tsu Shah Tropsch process, etc. tow Liquid wax) lubricating base oil of the raw materials Wattasu decomposition Z isomerization mineral oil obtained by hydrocracking and or isomerization containing wax composed mainly of n- paraffins of like.

Synthetic oils, specifically, poly α- Orefin (e.g., 1-Okuteno Li Goma, 1 Desen'ori Goma, ethylene one propylene Ori Goma, etc.), hydrides of poly α- Orefin, Isobuten'ori Goma, Isobuten'ori Goma of water Motobakemono, iso-paraffins, alkylbenzenes, alkylnaphthalenes, diesters

(E.g., ditridecyl glutarate, Jiokuchiruaji base one preparative, diisodecyl § Jipeto, ditridecyl adipate, di-O-lipped Le sebacate), polyol E ester (e.g., trimethylolpropane caprylate, trimethylolpropane Nperarugoneto, trimethylol propane I isostearoyl trimethylolpropane one Honoré propane ester such as ants sulfonate Honoré; Pentaerisuri Tonore 2- Echinore to hexanoate, Pentaerisuri Torr ester), polio xylene alkylene glycol such as a pen Taerisuri tall pelargonate, dialkyl phenylene ether, and Porifue two ethers such and the like.

In the present invention, as a lubricating oil base oil, mineral base oil, synthetic base oils or any mixture of two or more lubricants selected from these may be used. For example, mention may be made of one or more mineral base oil, one or more synthetic base oils, mixed oils of one or more of the mineral base oils and one or more synthetic base oils.

The viscosity index of the lubricating base oil is not particularly limited, preferably 90 or more, more preferably 1 5 or more, more preferably be 1 20 or more les. The use of high base oil viscosity index, more oxidative stability is high, fuel economy, it is possible to obtain a composition having excellent low temperature viscosity characteristics. The viscosity index of the lubricating base oil is usually 250 or less, preferably 200 or less. In the case of mineral lubricating base oils, their availability and production cost, it is desirable that 1 60 or less in view of excellent low-temperature viscosity characteristic.

NOACK evaporation loss of the lubricating base oil is not particularly limited, but is usually 20 wt% or less, preferably 1 6 mass. / 0, more preferably from 10 to 1 5% by weight. Tend to NOACK evaporation amount is much evaporation loss of the lubricating oil exceeds 20 mass%, a long period becomes difficult to maintain the fuel saving performance prone to viscosity increase and additive concentrate is less than 1 0 mass% lies in the increase less likely fuel-saving performance.

Kinematic viscosity at 1 00 ° C of the lubricating base oil is not particularly limited, is preferably from 1 to 20 mm 2 Z s, more preferably 3. 5 to 6 mm 2 Zs, the rather more preferably 3. 7-4. a Smm 2, s, and most preferably 3. 8~4. 2 mm 2 / s . The lubricating base oil 1 00 ° less kinematic viscosity l mm 2 / s at C of, the number evaporation loss of the base oil due to heat generated from the internal combustion engine, is feared adverse effects on the viscosity increased and the exhaust gas , on the other hand, when it exceeds 20 mm 2 Zs, the power loss due to viscosity resistance is increased, tends to the fuel saving performance hardly maximize.

Kinematic viscosity at 40 ° C of the lubricating base oil is not particularly limited, is preferably 1 0-1 is 0 Omm 2 Zs, more preferably 1 3 to 25 mm 2 Z s, 1. 5 to more preferably from 2 Omm 2 Z s, 1 6~1 9mm 2 Zs Dearuko and it is particularly preferred. Viscosity index of things Accordingly composition to a kinematic viscosity 1 0 Omm 2 ^ or less in 40 ° C can be increased, also excellent in fuel economy. On the other hand, anti-wear, in view of evaporation loss inhibition, it is preferable that the kinematic viscosity at 40 ° C is 1 0 mm 2 Zs or more.

% C P of the lubricating base oil is not particularly limited, from the viewpoint of excellent by suppressing the effect of acid number increase及beauty viscosity increase in the NO X presence, preferably 60 or more, more preferably 70 or more, more preferably and at 8◦ above, no particular constraint P Ushitora to the upper limit, although 95-1 00 even as good as one embodiment of the onset bright, preferably 95 or less in terms of more excellent solubility of soot dispersibility Ya sludge.

Also, the% 〇 1 ^ lubricating base oil is not particularly limited, from the viewpoint of excellent by suppressing the effect of acid number increase and the viscosity increase in the NO X presence, preferably 40 or less, preferably Ri good 30 or less, more preferably 20 or less, particularly preferably 1 5 or less.

The% Rei_4 of the lubricating base oil is not particularly limited, and is preferably 5 or less in terms of more excellent effect of suppressing acid number increase and the viscosity increase in the NO X presence, more preferably 2 or less, more preferably 1 or less, and most preferably 0.5 or less.

The% 〇 53 Bruno% of the lubricating base oil.1 ^ is not particularly limited, from the viewpoint of excellent by suppression of put that acid number increase and the viscosity increase in the presence of NO X, preferably 1 or more, more preferably 3 or more, more preferably 5 or more, particularly Ri preferably 6 or more der, There is no particular restriction on the upper limit, preferably in view of more excellent solubility of soot dispersibility Ya sludge 20 or less, more preferably 1 5 or less, more preferably 1 0 or less, in particular preferably 8 or less.

Herein, the term 0/0 C A, and the% C P and 0 / oC N, determined by a method in accordance with ASTM D 3 2 38- 8 5 respectively (n-d-M ring analysis), aromatic It means a percentage of the total number of carbon atoms of the carbon number, the percentage of the total number of carbon atoms percentages and naphthenic carbon atoms to the total number of carbon atoms of the paraffin carbon number, respectively.

Although sulfur is not particularly limited in the lubricating base oil is preferably 0.5 3% by mass or less, 0.1 2 wt. More preferably / 0 or less, more preferably 0.5 or less 1 wt%, 0.1 0 1 mass% or less is most preferable.

In the present invention, the lubricant base oil, mineral base oil and Z or poly α- Orefu in base oils are preferred. The mineral base oil, in particular, hydrocracked mineral oil or Wa Tsu box isomerization mineral oil is preferred, as the polyhistidine one Orefin base oil, from 6 carbon atoms 1 8 α- Orefin, especially carbon atoms 6 to 1 2 Roh α- copolymer or its hydrogenation product of Orefin is preferred. The (Alpha) viscosity index improver used in the present invention, the viscosity index improver of a non-dispersion type or dispersion type may be mentioned. Specifically, non-dispersed or distributed polymethacrylonitrile Li rate such, distributed ethylene - alpha-old Refuin copolymer or its hydrides, polyisobutylene or its hydride, styrene one Genco polymers, styrene monoanhydride maleic ester copolymers and polyalkyl styrene and the like, more than 10,000, preferably weight average molecular weight among, more preferably 20,000 or more, further preferred properly 50,000 or more, particularly preferably 80,000 or more, usually 1 0 0 10,000 or less, preferably 4 0 10,000 or less, more preferably 3 0 10,000 or less, more preferably 2 0 20,000 or less, particularly rather preferably 1 50,000 following non-dispersive viscosity index improver and / or distributed viscosity index improver is preferably used, particularly used dispersant viscosity index improver are most preferred.

The non-dispersive viscosity index improver, specifically, the following general formula (1), (2) and monomers selected from among compounds represented by (3) (hereinafter, "monomer (.mu. 1) "hereinafter. homopolymers or monomer (.mu. 1 2 or more copolymers or their hydrides, etc.) of) can be exemplified.

Meanwhile, as the dispersion type viscosity index improvers, specifically, the following general formula (4) and a monomer selected from the compounds represented by (5) (hereinafter, "monomer (.mu. 2) will leave J .) two or more or a copolymer or a hydrogenated product of the general formula (1) one or more generally to (3 monomers selected from compounds you express in) (M- 1) equation (4) and a copolymer of one or more monomers selected from among compounds represented by (5) (M- 2), or hydrides thereof and the like.

In the general formula (1), R 1 represents a hydrogen atom or a methyl group, R 2 represents a hydrogen atom or an alkyl group with carbon number 1-1 8.

Examples of the alkyl group with carbon number 1-1 8 represented by R 2, a methyl group, Echiru group, propyl group, butyl group, a pentyl group, a hexyl group, a heptyl group, O click ethyl group, nonyl group, decyl group, a decyl group, Undeshiru group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, to Kisadeshiru group, heptadecyl group, 及 beauty Okutadeshiru group (these alkyl groups may be branched be linear .) and the like can leave by way of example. In the general formula (2), R 3 represents a hydrogen atom or a methyl group, R 4 represents a hydrogen atom or a hydrocarbon group with carbon number 1-1 2.

Examples of the hydrocarbon group with carbon number 1-1 2 represented by R 4, specifically, a methyl group, Echiru group, propyl group, butyl group, a pentyl group, a hexyl group, a heptyl group, O click ethyl group , nonyl group, decyl group, Undeshiru group, alkyl groups such as dodecyl group (these alkyl groups may be branched be linear.); cyclopentyl, alkoxy Honoré group cycloheteroalkyl, such as heptyl group consequent opening Sik port Anorekiru group for 5-7 carbon atoms; Mechirushikurope pentyl group, dimethylcarbamoyl Honoré cyclopentyl Honoré group, methyl E chill cyclopentyl group, Jechi Rushikuropenchiru group, hexyl group methylcyclohexyl, dimethyl cyclohexyl group, a cyclohexyl group menu Chiruechirushikuro , hexyl group Jechirushikuro, Petit Le group methylcyclohexane, dimethyl cyclo heptyl group, heptyl group methyl E chill cycloalkyl, Alkylcycloalkyl groups 6-1 1 carbon atoms, such as heptyl group Echirushi black (substitution position of the cycloalkyl groups of these alkyl Le group is optional.); Bulle group (Eteyuru group), propenyl group, Buteyuru group, Penteyuru group, hexenyl group, heptenyl group, O click thenyl, nonenyl, decenyl, Undeseniru group, alkenyl group (these alkenyl groups such as dodecenyl groups may be branched be linear, two . position of the double bond is also arbitrary); phenyl group, Ariru group such as a naphthyl group: tolyl, xylyl, Echirufue two Honoré group, propylidene Honoré phenyl group, butylphenyl group, Penchirufue two Honoré group, to Kishirufuweniru group alkyl § aryl group (these Al kill group with carbon number 7-1 2 may be and straight-chain or branched, also to Ariru group Substitution position also Ru Optional der);. A benzyl group, Fueniruechiru group, phenylpropyl group, phenylbutyl group, phenylene Rupenchiru group, carbon number 7-1 2 Ariruaruki Le group (these alkyl groups such as a cyclohexyl group Fueeru it may be and straight-chain or branched.) and the like can be mentioned

In the general formula (3), E及Pi or, independently for each occurrence, hydrogen, carbon number 1-1 8 alkoxy group: or the number of carbon atoms (one OR 5 alkyl group for R 5 carbon atoms 1 to 1 8) monoalkyl § amino group of 1~ 1 8 (- NHR 6: R 6 is an alkyl group of from 1 to 1 to 8 carbon atoms) shows a.

In the general formula (4), R 7 represents a hydrogen atom or a methyl group, R 8 represents an alkylene group having 1 to 1 8 carbon atoms, E 1 is two 1 nitrogen atom, 0 oxygen atoms showed an amine residue or heterocyclic residue containing 2, a is 0 or 1.

The alkylene group of carbon number 1-1 8 represented by R 8, specifically, Echire down, propylene, butylene, pentylene group, hexylene group, heptylene group, Okuchiren, nonylene, decylene group, Undeshiren group, dodecylene group, tri decylene, tetradecylene, pentadecylene, the hexadecylene group, hepta decylene and Okutadeshiren group, (these alkylene groups may be branched be linear.) and the like can be mentioned .

Further, the group represented by E 1, specifically, Jimechiruamino group, Jechiru group, dipropylamino group, Jibuchiruamino group, Anirino group, toluidino group, xylidino group, Asechiruamino group, Benzoiruamino group, a morpholino group, pyrrolyl group, pyrrolino group, pyridyl group, methylpyridyl group, pyrrolidinyl group, Piberiji group, quinonyl group, pyrrolidone Doniru group, pyrrolidone Donomoto, imidazolino group, and pin piperazino group and the like. In formula (5), R 9 represents a hydrogen atom or a methyl group, E 2 is 21 to one nitrogen atom, an Amin residue or heterocyclic residue containing two 0 the oxygen atom.

The group represented by E 2, specifically, Jimechiruamino group, Jechiruamino group, dipropylamino group, Jibuchiruamino group, Anirino group, toluidino group, alkoxy Rijino group, Asechiruamino group, Benzoiruamino group, morpholino group, pyrrolyl group , pyrrolino group, pyridyl group, methylpyridyl group, pyrrolidinyl group, piperidines lysinyl group, quinonyl group, pyrrolidone Doniru group, pyrrolidone Donomoto, imidazolino group, and Birajino group and the like.

Preferred examples of the monomer (M- 1), specifically, 1 to carbon atoms 1 8 § Rukiruata Li rate, 1 to carbon atoms 1 8 Arukirumetaku Li rate, Orefuin carbon number 2-2 0, styrene , Mechinoresuchiren, maleic anhydride ester, such as anhydrous Ma maleic acid Ami de, and mixtures thereof can be exemplified.

Preferred examples of the monomer (M- 2), specifically, dimethylaminomethylidene Rumetakuri rate, Jefferies chill § amino methyl methacrylate rates, dimethylamino ethyl Rumetakuri rate, Jefferies chill aminoethyl methacrylate rates, 2-methyl-one 5- bi two Rubirijin, morpholino methyl methacrylate, morpholinium Noe chill methacrylate over preparative, N- Byurupirori pyrrolidone and mixtures thereof and the like.

Is not particularly limited with the copolymerization molar ratio of the copolymer of monomer (M- 1) and monomer one (M- 2), the monomer (M- 1): Monomer (M- 2) = 8 0: 2 0-9 5: about 5 is preferred. The copolymerization method is also arbitrary, for example, readily possible to obtain a copolymer by causing a monomer (M- 1) in the presence of a polymerization initiator such as Benzoiruba Okishido monomer (M- 2) radical solution polymerization can.

PSSI of viscosity index improver used in the present invention (Permanent Xia static Billiton tee index) is required to be 3 0 or less, preferably 2 0 or less, more preferably 1 5 or less, more preferably 1 2 a following. On the other hand, the viscosity index improving effect of the composition and too low is small and fuel economy improvement effect is small, it is preferably 3 or higher, 5 or more is more preferable. It is to be noted that the PSSI referred to here, ASTMD 6 0 2 2 - 0 1 conforms to the (Standard Practice for Calculation of Permanent Shear Stability Index), ASTMD 6 2 7 8 - 0 2 (Test Metohd for Shear Stability of Polymer Containing Fluids the using a European Diesel was calculated based on the measured data by Injector Apparatus), it means a permanent shear stability index of the polymer (permanent shear stability index).

The content of the viscosity index improver in the lubricating oil composition of the present invention is usually 1 to 3 0 wt whole composition standards. / 0, preferably from 5 to 2 5 mass. / 0, more preferably 8-2 0 mass. / 0, particularly preferably 1 2-1 8 wt%.

In the present invention, PSSI is a 3 0 following viscosity index improvers, viscosity number finger of the composition is blended in an amount of between 1 6 0 or more. Preferably the viscosity index is 1 7 0 or more of the composition, more preferably not be added in an amount of 1 8 0 or more, particularly restrictions on the upper limit is not but usually 3 0 0 or less, preferably 2 5 0 or less, more preferably 2 0 0 or less, more preferably 1 9 0 or less. By viscosity index of the composition is formulated the amount of viscosity index improver to be 1 6 0 or more, lowering the viscosity at run temperature range, it is possible to improve the fuel economy. In the present invention, when Ru enhances the viscosity index is preferably be considered as not too high kinematic viscosity of the amount and composition of the viscosity index improver, the mixing amount of the viscosity index improver, the composition it is particularly preferred that the viscosity index of the object is formulated to be 2 0 0 below. In this case, it is possible to obtain a better composition in high-temperature detergency.

In the present invention, as the kinematic viscosity decreasing rate becomes 1 to 5% or less in 1 0 0 ° C after shearing, PSSI is blended 3 0 less viscosity index improver. Incidentally, kinematic viscosity reduction rate of 1 0 0 ° C after shearing referred to herein is the ASTMD 6 2 7 8 - complies with 0 2 (Test Metohd for Shear Stability of Polymer Containing Fluids Using a European Diesel Injector Apparatus), a kinematic viscosity at 1 0 0 ° C measured after the shear test (V 2), the calculated data on the basis of the kinematic viscosity (VI) in 1 0 0 ° C before the shear test ((V 1-V 2) ZV 1 X 1 0 0) means (%).

Examples of the viscosity index improver in the present invention, increasing the viscosity index, from the viewpoint of excellent energy saving propensity on effect, virtuous preferable to use a polymethacrylic rate based viscosity index improver. PSSI of polymethacrylate viscosity index improver used in the present invention is 3 0 or less, preferably 1 5 or less, more preferably 1 0 or less, particularly preferably 8 or less, preferably 1 or more, more preferably 3 or more. Particularly PSSI is preferable to use 1 5 following polymethacrylate viscosity index improver.

Use as a viscosity index improver in the present invention also reduces the actual effective viscosity at high temperature and high shear conditions, from the viewpoint of more excellent high-temperature detergency is excellent in energy saving property, the styrene one Genco polymer one based viscosity index improver Les, Ru is preferred. PSSI of styrene-Genco polymeric viscosity index improver used in the present invention is 3 0 or less, preferably 1 5 or less, more preferably 1 2 or less, preferably 1 or more, more preferably 3 or more, more preferably 5 or more, particularly preferably the 8 or more. Styrene one Genco polymeric viscosity index improver, styrene, polystyrene and one or more styrenic monomers or be selected from hydrides thereof (co) polymers, Zhen acids, Porijen acids and their hydrides one or more diene monomers or (co) copolymer or hydrogenated product thereof with a polymer selected from the Examples of the diene-based monomer or (co) po Rimmer, butadiene, polybutadiene and their hydrogen Bed Tajen monomer or like product (co) polymer, isoprene, isoprene-based monomers such as polyisoprene and their hydrogenated products or (co) is preferably Bareru selected from polymers, the isoprene-based monomer or (co) polymer this is selected from the group consisting of But more preferable. These styrene-Genco polymeric viscosity exponent improvers, and a styrene monomer or (co) polymers, even alternating copolymer of diene-based monomer or (co) polymer, have filed a random copolymer also, it may be a block polymer. Styrenic monomers Wakashi Ku is among these with (co) polymer, more preferably a block copolymer of a diene monomer or (co) polymers, styrenic monomers or (co) polymer one, Jen system monomer or (co) is more preferable that it is a block copolymer of a polymer, block copolymer is particularly preferred to have a polystyrene proc and hydrogenated polyisoprene blocks.

The block copolyether Rimmer having polystyrene blocks and hydrogenated polyisoprene blocks, for example, in the structural formula EP- S (wherein, EP is the number average molecular weight before hydrogenation (M n) is 20, 000-1 50 a hydrogenated polyisoprene blocks is 000, S is the number average molecular weight (M n) force S 1 0, block copolymers having the structure of 000-60, is a polystyrene block is 000) include , it is particularly preferred in the present invention.

Another example of a block Kukoporima having polystyrene blocks and hydrogenated polyisoprene blocks, for example, structural formula EP '- S - EP "(wherein, EP' is a number average molecular weight before hydrogenation (M n) is 40, a 000 to 1 50, the first hydrogenated polyisoprene blocks is 000, S is the number average molecular weight (M n) of 2 5, 000-60, a polystyrene block is 000, EP "is the number-average molecular weight before hydrogenation (M n) is 2, 500 to 30, a second hydrogenation polyiso-plane block is 000, EP '/ EP" molecular weight ratio of a 4 least) in include asymmetric triple lock-copolymer Table.

As another example, (ΕΡ '- S- EP " ) n - structure (E [rho represented by X' is the number-average molecular weight before hydrogenation (Micromax eta) is 1 0, 000-1 00, 000 a first hydrogenated block of polyisoprene (1 ') is, S is the number average molecular weight (Micromax eta) is 6, 000 to 50, a block 000 of polystyrene, E [rho "is before hydrogenation the number average molecular weight (Micromax eta) 2, 500-50, "a hydrogenated block of, I 'I second polyisoprene down is 000 (1)" at least a molecular weight ratio (MJ of be 1.4 , X is nuclear consisting polyalkenyl coupling agent, eta is - star formed by reacting (Ε Ρ 'S- Ε Ρ ") arms per mole 2 moles or more polyalkenyl coupling agent stellate polymers with Jo molecule 1 is the average number of arms per molecule) and the like. the lubricating oil composition of the present invention, (beta) Li As preferably contains a containing compounds. Phosphorus-containing compound is not particularly limited as long as it is a compound containing phosphorus in the molecule, for example, phosphorus compounds represented by the general formula (6), the general formula (7 phosphorus compounds represented by), their metal salts, amine salts thereof, and is preferably at least one compound selected from the group consisting of their derivatives. In the formula (6), X 1, X 2 and X 3 are each an oxygen atom or a sulfur atom individually, R 1 Q, R 11 and R 12 are each independently a hydrogen atom or 1 to 3 carbon atoms 0 or a hydrocarbon group shown N, S, O or the like to the substituent group having from 1 to 30 carbon atoms containing a hetero element.

X 7

R13 one chi 4 one ρ one χ6 one R 15 (7) X 5 - R " formula (7), X 4, X 5, X 6 and X 7 are each independently an oxygen atom or a sulfur atom (X 4 , one or two X 5 and X 6 is a single bond or a (poly) may be Okishiarukire down group.), R 13, R 14 and R 15 are independently hydrogen atom or a number of 1 to 30 carbon respectively hydrocarbon group, or shows N, S, O or the like to the substituent group having from 1 to 30 carbon atoms containing a hetero element.

Examples of the hydrocarbon group with carbon number 1 to 30 represented by R 1 G to R 15, an alkyl group, a cycloalkyl group, an alkenyl group, an alkyl-substituted consequent opening alkyl group, Ariru group, an alkyl-substituted Ariru group, and § It can be exemplified reel alkyl group, preferably an alkyl group or Ariru group of carbon number 6-24 having 1 to 30 carbon atoms, more preferably 3 carbon 1 8, more preferably 4 carbon 1 it is a 2 alkyl group. These hydrocarbon groups are an oxygen atom, a nitrogen atom, may include any of a sulfur atom in the molecule, but preferably the hydrocarbon consisting of carbon and hydrogen.

Examples of the phosphorus compound represented by the general formula (6), for example, phosphorous acid, Monochio phosphite, Jichio phosphite, Torichio phosphite; phosphorous having one hydrocarbon group of the 1 to 30 carbon atoms phosphoric acid monoester, Monochio phosphite monoester, Jichio phosphite monoester, Torichio phosphorous acid monoester; phosphite diester having two carbon hydrocarbon groups of 1 to 30 carbon atoms, Monochio phosphite diesters, dithiasuccinoyl O phosphite diester, Torichio phosphorous acid diesters phosphite triester having three carbon hydrocarbon groups of 1 to 30 carbon atoms, Monochio phosphite triester, Jichio phosphite triester, Torichio phosphite triester; and it can be exemplified these mixed compounds.

Examples of the phosphorus compound represented by the general formula (7), for example, phosphoric acid, Monochiorin acid, Jichiorin acid, trithiophosphoric acid, Tetorachiorin acid; phosphoric acid monoester having one hydrocarbon group having the carbon number of 1-3 0 , Monochiorin acid monoester, di Chio y phosphate monoester, Torichiorin acid monoester, Te Torachiorin acid monoester; having two phosphodiester hydrocarbon groups of carbon number 1 to 3 0, mode Nochiorin acid diesters, dithiophosphoric diesters, trithiophosphoric acid diesters, Tetorachiorin diesters;-phosphate triesters having three hydrocarbon groups of carbon number 1 to 3 0, Monochiorin acid triester, Jichiorin acid triester, Torichiorin acid triester, Tetorachiorin acid triester; number of carbon atoms from 1 to 3 0 hydrocarbon Phosphonic acids having three 1 group, phosphonic acid monoester, diester, the Li emission compound having 1 to 4 carbon atoms (poly) Okishiarukiren group; 3- Jichiohosuhoriru propionic acids Ya dithiophosphate derivatives of Orefinshi black penta Jen or (methyl) the phosphorus compound of the reaction product of methacrylic acid; and can be mixtures thereof.

The salt of the general formula (6) or (7) a phosphorus compound represented by the metallic oxides phosphorus compounds, metal hydroxides, metal carbonates, metal metal base of chlorides, ammonia, carbon atoms 1 to 3 0 of only hydrocarbon group or a non Dorokishiru group-containing hydrocarbon group by the action of nitrogen compounds Amin compounds having in the molecule, there may be mentioned salts formed by neutralizing part or all of the acidic hydrogen remaining it can.

The metal in the metal base, specifically, lithium, sodium, forces potassium, alkali metal such as cesium, calcium, magnesium, alkaline earth metals such as barium, zinc, copper, iron, lead, nickel, silver, manganese, heavy metal such as molybdenum. Calcium Among these, Al force Li earth metals and zinc or magnesium are preferred.

As the nitrogen compound, specifically, ammonia, monoamines, Jiamin, polyamines.

Among these nitrogen compounds Deshiruamin, Dodeshiruamin, dimethyldodecylamine Amin, fats having Torideshiruamin, heptadecyl § Min, O Kuta decyl § Min, an alkyl group or an alkenyl Le group Orei Ruamin and a C 1 0-20 such Suteariruamin family Amin (they may. be also branched linear) can be mentioned as preferable examples.

The phosphorus-containing compounds, the following (B 1) ~ at least selected from (B 3) be contained in the lubricating oil compositions of the present invention the one as the main component is particularly desirable. (B 1) dialkyl Jichiorin zinc having a secondary alkyl group selected from 3 to 8 carbon atoms

(B 2) a dialkyl zinc dithiophosphate having primary primary alkyl group selected from 3-8 carbon atoms

The (B 3) a metal salt The phosphorus-containing acid which does not contain sulfur (B 1) and (B 2) component, those such as represented by the following formula (8) can be exemplified.

R, 6

R 17 In the formula (8), R 16, R 17, R 18 and R 19 are also the same, be different rather good, independently for each occurrence, cetane Dally alkyl group or a primary alkyl group having a carbon number of 3-8, preferably shows the secondary primary alkyl group or a primary primary alkyl group of carbon number 6-8 of 3-6 carbon atoms, alkyl groups having different numbers of carbon atoms in the same molecule, have an alkyl group having different structure (secondary, primary) it may be. In the present invention, preferably contains a dialkyl Kirujichiorin zinc having a secondary alkyl group selected from low density is a also with a view to easily suppress the abrasion under mixed soot (B 1) the number of carbon atoms 3-8 , can further improve the oxidation stability, in that the base number retention performance can be enhanced remarkably (B 2) preferably contains a zinc dialkyldithiophosphate having a primary primary alkyl group selected from 3 to 8 carbon atoms , in that it can balance well improve the control performance and base number retention properties of wear under mixed soot with a high level, and most preferably used in combination with (B 1) and (B 2) component. Further, the (B 3) component is a metal salt of a phosphorus-containing acid which does not contain sulfur, all of the previous SL-in formula (6) 3 or one oxygen atom (XX 2 and X 3 2 One the metal salts of the phosphorus compound is a single bond or a (poly) Okishiarukiren may be a group.), all of X 4 to X 7 in the general formula (7) is an oxygen atom (X 4, X 5 and X 6 one or two metal salts of Li down compound is a single bond or a (poly) Okishiarukiren may be a group.) it can be cited as typical examples. These (B 3) component, can be preferably used in that it is the this increase high temperature detergency and oxidation stability, the long-drain properties such as base number retention property remarkably.

Metal salts of the phosphorus compounds, differ in their structure depending on the number of OH groups of valency Ya phosphorus compound of a metal, therefore is no limitation for that structure. For example, zinc oxide 1 mol of phosphoric acid diester (OH group has one) is formed by reaction with 2 moles, but compounds having a structure represented by the following general formula (9) is considered to be obtained as a main component, port Rimmer phased molecule is also considered to be present.

For example, when the zinc oxide 1 mol of phosphoric acid mono ester (OH groups are two) are reacted with one mole, compounds having a structure represented by the following general formula (1 0) is obtained as a main component force considered S, also polymerized molecules believed to be present.

(Ten)

Among these (B 3) component, salts of phosphorous acid diester and zinc having two alkyl or Ariru group of 3-1 8 carbon atoms, an alkyl group or Ariru group having 3 to 8 carbon atoms salts with monoester and zinc phosphate having one, salt of diester and zinc phosphate having two alkyl or Ariru group having 3 to 8 carbon atoms, an alkyl group of carbon number 1-1 8 or it is preferable to § Li Ichiru group is having two salts with phosphonic acid monoester and zinc. These components may be optionally blended one or two or more types above.

The phosphorus-containing compound contained in the lubricating oil compositions of the present invention, in particular a metal salt of a phosphorus acid esters are preferably used, S / P (molar ratio) is 1.5 or less are preferred ones, more preferably 1 or less, and most preferably 0.

The content of the phosphorus-containing compounds in the lubricating oil compositions of the present invention, from the viewpoint of high-temperature detergency and base number retention property, as phosphorus content, 0.2 wt% or less, and more rather preferably 0s. 1 mass % or less. On the other hand, in terms of easily suppressing the abrasion under mixed soot, as phosphorus content, 0.0 0 5 wt% or more, more preferably 0.0 1% by mass or more, more preferably 0.0 2 wt% or more , particularly preferably 0. 0 4 mass% or more. The lubricating oil composition of the present invention may further (C) a metallic detergent, be contained one additive at least selected from the group consisting of (D) ashless dispersants and (E) an antioxidant preferable.

The (C) a metallic detergent, more particularly, may be mentioned a sulfonate detergent, Hue sulfonate detergent, a salicylate detergent.

The sulfonate detergent is not particularly limited in its structure, for example, the molecular weight 1 0 0-1 5 0 0, preferably by sulfonic Hong the 2 0 0-7 0 0 alkylaromatics the Al force Li metal salt of the resulting alkyl aromatic sulfonic acids or include Al force Li earth metal salts, particularly magnesium salts and / or calcium salts are preferably used, and the alkyl aromatic sulfonic acids, specifically It is such petroleum sulfonic acids and synthetic sulfonic acids. The petroleum sulfonic acid, a by-product alkylaromatic compound in the lubricant fraction of a mineral when Ya white preparative oil production that sulfonated In general, so-called mahogany acid or the like is used. Examples of synthetic sulfonic acid, for example, or by-produced from the alkylbenzene manufacturing plant as a detergent raw material, obtained by alkylating benzene polyolefins, alkylbenzene having a linear or branched alkyl group as a raw material, which ones were sul Hong reduction, or the like obtained by sulfonating Gino two Le naphthalene is found using. Although not particularly limited to the sulfonating agent used for sulfonating these alkyl aromatic compounds, typically, fuming sulfuric acid or sulfuric acid is used. As the sulfonate detergent, directly, it is reacted with Al force Li earth metal bases such as oxides or hydroxide of Al force Li earth metals magnesium and or calcium alkyl aromatic sulfonate of the or, or not only once Natoriumu salt or force Riu beam neutral Al force Li earth metal sulfonates obtained Ri by the like be replaced after the alkali metal salts and Al force Li earth metal salts such as salts, during the basic Al force obtained by sexual Al force Li earth metal sulfonate with an excess of Al force Li earth metal salt or Al force Li earth metal base (hydroxide compound or oxide) are heated in the presence of water Li earth metal sulfonate Ya, resulting et by the this reacting on SL neutral Al force Li earth metal sulfonate with a base Al force Li earth metal in the presence of carbon dioxide and / or boric acid or borate Carbonate overbased Al force Li earth metal sulfonates are, also included borate persalt group of Al force Li earth metal sulfonate.

In the present invention, as sulfonate detergents may be used above the neutral alkaline earth metals sulfonates, basic alkaline earth metal sulfonates, overbased alkaline earth metal sulfonate and mixtures thereof.

The salicylate detergent is not particularly limited in its structure, metal salts of salicylic acid having two 1 an alkyl group having 1 to 4 carbon atoms 0, preferably Al force Li metal salt or aralkyl force Li earth metal salts used properly preferred particularly magnesium salts and Z or calcium salts.

The salicylate-based detergent in the present invention, from the viewpoint of excellent low-temperature viscosity characteristics, it is preferable higher component ratio of the monoalkylsalicylic acid metal salt, for example, monoalkyl composition ratio of salicylic acid metal salt 8 5~ 1 0 0 mo 1%, and the composition ratio of the dialkyl salicylate Le acid metal salt is a 1 5 mo 1% 0 to, alkyl salicylic acid metal salt composition ratio of 3 _ alkyl salicylic acid metal salt is 1% 4 0~ 1 0 O mo , and Z or is preferably the (over) basic salts. As the Sarishire bets based detergent in the present invention, preferably those containing Jiarukirusa salicylic acid metal salt in terms of more excellent high-temperature detergency and base number retention properties.

The alkyl group in the alkyl salicylic acid metal salt constituting the salicylate detergent, 1 0-4 carbon atoms 0, preferably 0-2 carbon atoms 1 0-1 9 carbon atoms or

3 0, more preferably an alkyl group having 1 4-1 8 or C 2 0-2 6 carbon atoms, particularly preferably an alkyl group having 1 4 to 1 8 carbon atoms. The Al kill group having a carbon number of 1 0-4 0, decyl group, Undeshiru group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, to Kisadeshiru group, heptadecyl group, Okutadeshiru group, nonadecyl group, Ikoshiru group, Henikoshiru group, docosyl group, tricosyl group, Tet Rakoshiru group, pentacosyl group, to Kisakoshinore group, Heputakoshinore group, Okutakoshiru group, an alkyl group having a carbon number of 0-4 0 such nonacosyl group and triacontyl group. These alkyl groups may be a be branched linear, bra Lee Marie alkyl group, a secondary alkyl group, it may be filed by tertiary alkyl groups, the desired salicylic acid metal in the present invention in that easily obtained salt, particularly preferably a cell Kanda Lee alkyl group.

The metal in the alkyl salicylic acid metal salts, alkali metals such as sodium and force Liu beam, calcium, alkaline earth metals such as magnesium and the like, calcium, preferably magnesium, in particular to be a calcium preferable.

In the present invention, salicylate detergent, an alkali metal or alkaline earth metals Sarishire Doo (neutral salt), further excess of alkali metal or alkaline earth metal salt or Al force Li metal or aralkyl force Li earth metal base (Al force Li metal or aralkyl force hydroxide or oxide of Li earth metals) and basic salts obtained by heating in the presence of water, carbon dioxide gas or boric acid or borate overbased salts in the presence obtained by reacting with a base such as hydroxides of Al force Li metal or aralkyl force Li earth metals the neutral salts are included.

The Fueneto detergent, specifically, 4 to 4 carbon atoms 0, preferably a Arukirufu perilla Ichiru having at least one straight or branched alkyl group having 6-1 8 carbon sulfur Al force Li earth metal salts of alkylphenols sulfates eye de or Mannich reaction products of Arukirufuweno one Le obtained by reacting this alkylphenol with formaldehyde obtained by reacting, in particular magnesium and Z or calcium salt It is preferably used.

The Fueneto detergent used in the present invention, the above manner resulting Al force Li metal or alkaline earth metal Fueneto (neutral salt), further excess of alkali metal or Al force Li earth metal salts and basic salts and obtained by Al force Li metal or aralkyl force Li earth metal base (Al force hydroxide or oxide of Li metal or aralkyl force Li earth metal) is heated in the presence of water, include overbased salts more obtained by reacting with a base such as hydroxides of Al force Li metal or aralkyl force Li earth metals the neutral salt in the presence of carbon dioxide or boric acid or borate It is.

In the present invention, the metallic detergent, calcium, Al Chikarari earth metal detergents are preferred, such as magnesium, especially sulfonate detergents are preferred.

Base number of the metallic detergent used in the present invention is optional, in order to achieve good detergency, usually base number those 0~ 500 mg KOH / g can be used, base number retention characteristics and excellent high-temperature detergency, and to the particular composition of superior performance antiwear properties thereof base number is preferably 1 50~4 5 0111§1: 0 ^ 1 §, in a further preferred It is used as a 200 to 400 mg KOH / g.

The nucleotide number refers to base number by perchloric acid method which is measured in accordance with 7. "Petroleum products and lubricants one neutralization number test methods" in JIS K250 1.

Metallic detergents are usually commercially available in a form diluted with a light lubricating base oil, also it is available, generally a metal content of 1.0 to 20 wt%, preferably Ku is 2. 0: 1 using a 6 mass 0/0 things.

Content of the metallic detergent in the lubricating oil compositions of the present invention is arbitrary, typically, the total amount of the composition as a metal amount, preferably 0.005 mass% or more is more preferable properly is 0.05 mass % or more, even more preferably 0.08 mass% or more, preferable properly 1 wt% or less, more preferably 0.5 mass. / 0 or less, more preferably not more 0.2 5 wt% or less, particularly preferably 0.1 5 wt. / Less than or equal to zero. If the content is less than 0.005 mass%, high-temperature detergency, anti-wear properties are likely to deteriorate, if it exceeds 1% by mass, tends to promote deterioration of the exhaust gas aftertreatment device such as DP F Become.

The (D) ashless dispersants, any ashless dispersants used in lubricating oil can and Mochiiruko, for example, a straight-chain or branched alkyl or alkenyl group having 40 to 400 carbon atoms in the molecule nitrogen-containing compounds having one at least or a derivative thereof, Oh Rui include modified products of Arukenirukohaku acid imide. It can be incorporated one or two or more selected arbitrarily from these.

The carbon number of the alkyl or alkenyl group from 40 to 400, preferably from 60 to 350. When the number of carbon atoms in the alkyl or alkenyl group is less than 40 reduces the solubility lubricating base oil of the compound, on the other hand, if the number of carbon atoms exceeds 400, the low-temperature flow properties of lubricating oil composition is deteriorated Therefore, each is undesirable. The § alkyl group or alkenyl group may be branched be linear, but in the preferred, specifically, propylene, 1-butene, copolymers of O oligomer and ethylene and propylene Orefin of isobutylene and a branched alkyl group or a branched alkenyl group derived from oligomers and the like.

Nitrogen content of nitrogen-containing compounds exemplified as an example of ashless dispersants is arbitrary, salt group number retention properties, high temperature detergency, and terms such as antiwear properties, typically 0. its nitrogen content 0 1-1 0 weight 0/0, preferably of 0.1 to 1 0 weight 0/0 is used. Specific ashless dispersants, for example, the following compounds may be mentioned. One or more compounds selected from these can be used.

(D 1) succinic acid imide having one also reduces the alkyl or alkenyl group having 40 to 400 carbon atoms in the molecule or a derivative thereof,

(D 2) Benjiruamin having one also reduces the alkyl or alkenyl group having 40 to 400 carbon atoms in the molecule or a derivative thereof,

(D 3) as the alkyl group or polyamine having one even alkenyl group and less in the molecule or the derivative above, (D 1) succinate I Mi de of 40 to 400 carbon atoms, more specifically, the following compounds can be exemplified represented by the formula (1 1) 及 beauty (1 2).

In the above formula (1 1), R 20 is 40 to 400 carbon atoms, preferably an alkyl or alkenyl group of 60 to 35 0, b is 1 to 5, preferably an integer of 2-4. In the above formula (1 2), R 21 and R 22 are each independently a carbon number of 40 to 40 0, preferably an alkyl or alkenyl group of 60 to 350, preferably a Poributeni Le group. c is 0 to 4, preferably an integer of 1-3.

Incidentally, succinic acid imide, upon the imide of, one end of a polyamine anhydride Koha click acid was added, and succinic acid I Mi de so-called mono-type, such as of formula (1 1), anhydrous across the polyamine succinic acid was added, there are succinic acid imide of the so-called bis type, such as of formula (1 2), the compound used in the present invention, the either, or may be a mixture thereof.

Preparation of these succinic acid imide is not particularly limited, for example, alkyl or Arukeeru the alkyl or alkenyl group having a carbon number of 40 to 40 0 ​​obtained by reacting maleic anhydride with 1 00~ 200 ° C succinic acid can be obtained by reacting a polyamine. The polyamines, specifically, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, Kisami emissions like to pentaethylene can be exemplified.

As the (D 2) Benjiruamin, more particularly, compounds that can be represented by the following formula (1 3) it can be exemplified.

Π3)

In the formula (1 3), R 23 is 40 to 400 carbon atoms, preferably an alkyl or alkenyl group of 60 to 3 50, d is from 1 to 5, preferably an integer of 2-4.

This method of manufacturing Benjiruamin is not limited in any way, for example, after the alkylphenol with profiles propylene oligomer, polybutene, and polyolefin such as ethylene one flight one Orefin copolymer is reacted with phenol, formaldehyde thereto de diethylenetriamine, Toriechirente Toramin, Te captured Chirenpentamin, and Poriamin of Kisamin like to pentaethylene can be obtained by reacting the Mannich reaction.

As the (D 3) a polyamine, more specifically, expressed that compounds with the following formula (1 4) can be exemplified.

H

R 24 - N-tCH 2 CH 2 NH ^ -H (14)

In the above formula (1 4), R 2 4, the number 4 0-4 0 0 atoms, preferably an alkyl or alkenyl group having 6 0 to 3 5 0, e is 1-5, preferably 2-4 show an integer number of.

Although the polyamine production method is not limited in any way, for example, propylene emissions oligomer, polybutene, and ethylene - After polio Refuin such α- Orefin copolymer chlorinated, this ammonia or Echirenjiamin, Jiechirento Riamin it can be obtained by reacting Toriechirente Toramin, tetraethylene pentamine, and polyamines such as Kisamin to Pentae styrene. Furthermore, derivatives of nitrogen-containing compounds exemplified as an example of (D) ashless dispersants, the concrete example, monocarboxylic acids having a carbon number of 1 to 3 0 to nitrogen-containing compound described above (such as a fatty acid) Ya oxalic acid, phthalic acid, trimellitic acid, by the action of polycarboxylic acid having a carbon number of 2-3 0 such Piromeri' bets acid, or neutralize part or all of Amino groups and / or Imino groups remaining and Ami de reduction, so-called acid-modified compounds; is reacted with boric acid to the above-described nitrogen-containing compound, part or or neutralize all of amino groups and / or Imino groups remaining was Ami de of the so-called boron-modified compounds; sulfur-modified compounds obtained by the action of sulfur compounds in the nitrogen-fluorinated compounds described above; and Sanhen of nitrogen-containing compounds described above, boron-modified, a combination of two or more modified selected from sulfur-modified modified compounds; and the like can be mentioned, et al It is. Boric acid metamorphic compound of Arukenirukohaku acid imide Among these derivatives excellent in heat resistance and oxidation resistance, is effective for enhancing the base number retention property and the like even in the lubricating oil composition of the present invention.

If the inclusion of (D) ashless dispersants in the lubricating oil composition of the present invention, the content thereof is not particularly limited, in the usual lubricating oil based on the total amount of the composition, preferably 0.0 1 to 20% by weight, more preferably from 0.1 to 1 0% by weight. When the content of component (D) is less than 0 1 wt% 0.1 a base number retention properties, it is impossible to enhance the high-temperature detergency and anti-wear properties or the like, on the other hand, when exceeding 20 wt% since the low temperature fluidity of lubricating oil sets Narubutsu is greatly deteriorated, respectively undesirable. The present invention - in, as component (D), if the inclusion of boron-containing succinic acid I Mi de ashless dispersant, it is possible to obtain an excellent composition by high temperature detergency, the content thereof, a set Narubutsu total amount as the amount of boron, preferably 0.00 1 to 0.1 wt%, more preferably 0.005 to 0.04 wt%, more preferably 0.0 1 to 0.0 2 mass it is%.

The (E) an antioxidant, phenol-based anti ashless oxidation such as an antioxidant Ya Amin antioxidant agents, such as metallic anti-oxidants such as molybdenum-based antioxidant, are commonly used in lubricating oil and has an antioxidant can be used. The added pressure of antioxidants, since the more enhanced the antioxidant properties of the lubricating oil composition can be enhanced Ri by the base number retention properties.

The phenol-based antioxidant, especially the following compounds may be mentioned as preferred examples. 4, 4 '- methylene bis (2, 6-di one tert- Buchirufueno Honoré), 4, 4' - bis (2, 6-di one tert- Petit Bruno reflex enol), 4, 4 '- bis (2-methyl-one 6- tert-butylphenol), 2, 2 'Mechirenbisu (4 Echiru 6- tert butyl Roh reflex enol), 2, 2' - methylenebis (4 Mechiru one 6 _ tert Petit Ruch enol), 4, 4 '- butylidenebis (3 - methyl one 6-tert- butylphenol), 4, 4, one isopropylidene bis (2, 6-di one tert- Petit Ruch enol), 2, 2 '- methylenebis (4 Mechiru one 6-Bruno Yul phenol) , 2, 2, single iso butylidene bis (4, 6-Jimechirufue Nonore), 2, 2 '- (carboxymethyl Bruno reflex enol to 4 Mechinore one 6- consequent opening) methylenebis, 2, 6-di one tert- Buchinore one 4-methyl phenol, 2, 6-di-tert - Bed Chiru 4 Echirufuenoru, 2, 4-dimethyl-one 6-tert Buchirufu phenol, 2, 6-di-one tert _ alpha-Jimechiruamino one p- cresol one Honoré, 2, 6-di-one tert _ butyl _ 4 (N, N '- Jimechiruami Bruno methyl phenol), 4, 4' Chiobisu (2- Mechinore one 6- tert Buchirufueno Ichiru), 4, 4 '- Chiobisu (3-methyl-one 6- tert - butylphenol), 2, 2 '- Chiobi scan (4 Mechinore one 6 - tert over butyrate Bruno reflex enol), bis (3-Mechinore one 4-arsenide Dorokishi one 5-tert _ butylbenzyl) Surufui, bis (3, 5-di one tert- butyl- 4 hydroxycarboxylic benzyl) Sunorefi de, 2, 2 '- Chioje Chirenbisu [3- (3, 5-di one tert- butyl one 4-arsenide Dorokishifueniru) propionate], tridecyl - 3- (3, 5-di _ t .ert - butyl one 4-arsenide de Loki Phenyl) propionate, pentaerythrityl lithium Rute tetrakis [3- (3, 5-di one tert- butyl one 4-arsenide Dorokishifueniru) propionate], Okuta decyl one 3- (3, 5 _ di one tert- butyl one 4- arsenide Dorokishifueniru) professional Pioneto. These may be used as a mixture of two or more kinds.

Examples of the amine-based antioxidant may be, for example, phenyl one α- Nafuchiruamin, Al Kirufueniru one a one Nafuchiruamin, di § Luchino registration phenylalanine § Min. These may be used as a mixture of two or more.

The molybdenum-based antioxidant, Arukiruamin complex sulphide O carboxymethyl molybdenum or Okishimoribude down, Aruke Erukohaku acid imide complex sulphide O carboxymethyl molybdenum or O carboxymethyl molybdenum sulfide O carboxymethyl molybdenum Chio carbamate, disulfide O key sheet molybdenum Chio phosphite Hue and organic molybdenum-based antioxidants such as one bets may be blended these one or more. Among them, by suppressing the viscosity increase in terms of more excellent in easy terms and high-temperature detergency maintained over fuel economy of a long, sulfate reduction O carboxymethyl molybdenum or O carboxymethyl molybdenum one ditridecyl § Min complexes, sulfides O · the sheet molybdenum or O carboxymethyl molybdenum - it is particularly preferred to formulate one or more kinds are Ru selected from Arukenirukohaku acid I Mi de 錯伴.

The phenol-based antioxidant, Amin-based antioxidant and a molybdenum-based antioxidants may be blended appropriately combined.

Case of incorporating in the lubricating oil composition of the present invention (E) an antioxidant, lubricating oil group Narubutsu total amount is preferably 5 wt% or less, preferably 3 mass% or less, more preferred properly is 2 wt% or less it is. Be formulated 5 beyond mass% is not preferable because the sufficient antioxidant properties commensurate with the amount can not be obtained. On the other hand, base number retention property, in order to further improve high temperature detergency, etc., in a total amount of the lubricating oil composition reference, 0.0 it is preferred to blend 1 mass% or more, more preferably 0.1 mass% or more, more preferably is 0. 8 mass% or more.

In the case of blending the molybdenum-based antioxidant, the amount thereof, in a total amount of the lubricating oil composition reference, 0. 0 0 1~.0. 2% by mass as the amount of molybdenum, preferably 0. 0 0 5-0 . 1% by weight, more preferably 0.0 1 to 0.0 4 wt. / 0, especially rather preferably 0. 0 1 to 0.0 3% by weight. The lubricating oil composition of the present invention, in not significantly worsen range performance of the lubricating oil composition of the present invention may be formulated in accordance with any additives that are commonly used in the lubricating oil for that purpose . Such additives include, for example, anti-wear agents, friction modifiers, corrosion inhibitors, anti-鲭剤, demulsifiers, metal deactivators, antifoaming agents, and the like additives such as colorants it can.

The antiwear agent, any anti-wear agents employed in the lubricating oil can be used. For example, it can be used extreme pressure agents such as sulfur-based, specifically, di Chio carbamate, Jisaru Huai earths Porisarufuai de, sulfurized Orefin acids, Ru include sulfurized fats and oils and the like.

In the lubricating oil composition of the present invention, when using these anti-wear agents, that contains Yuryou is not particularly limited, the total amount of the composition 0.0 to 5% by weight Shi preferred I. The friction modifier, an alkyl group or an alkenyl group having a carbon number of 6 to 3 0, in particular having one linear alkyl group or linear alkenyl group having a carbon number of 6 to 3 0 least in the molecule, Amin compounds, fatty esters, fatty Ami de, fatty acids, fatty alcohol, fatty ethers, (such as Oreiruhi hydrazide) human hydrazide, semicarbazide, Urea (Oreiruurea etc.), Ulei de, ashless friction modifiers, such as Biure' bets, molybdenum Denjichio carbamate, molybdenum Chio phosphate Hue one preparative metallic friction modifiers, such as and the like.

Examples of corrosion inhibitors include benzotriazole, tolyltriazole-based, thiadiazole-based, and Imidazoru based compounds.

The proof 鲭剤, for example, petroleum sulfonates, alkylbenzene sulfonates Ichito, dinonyl naphthalene sulfonate, Arukeerukohaku acid esters, polyhydric alcohol esters such as glycerin mode Nooree Ichitoya sorbitan O milled by wet one preparative, and § Min, etc. and the like. The demulsifier, for example, polyoxyethylene alkyl ethers, Ru include polyalkylene glycol-based nonionic surfactants such as Porioki ether.

As the metal deactivator, for example, Imidazorin, pyrimidine derivatives, alkyl Ruchiajiazoru, mercapto base Nzochiazoru, benzotriazole or derivatives thereof, 1, 3, 4-thiadiazole polysulfide Ruff Lee de, 1, 3, 4-thiadiazole Lil - 2 , 5-bis dialkyl Chio carbamate, 2- (Arukirujichio) Baie emission zone imidazole and 3- (o-carboxybenzyl thio) Puropionyutori le, and the like.

As the defoaming agent, for example, silicon cone, full-O rosiglitazone recall, and Furuoroa Ruki ethers, and the like.

In case of incorporating the these additives lubricating oil composition of the present invention, in its content a lubricating oil based on the total amount of the composition, friction modifiers, corrosion inhibitors, anti-鲭剤, a demulsifier which respectively 0 . 0 1-5 wt%, from 0.005 to 1 mass% in the metal deactivator, usually selected in the range of 0.0005 to 1% by weight antifoam agent.

Kinematic viscosity at 1 00 ° C of the lubricating oil composition of the present invention is not particularly limited, the preferred properly is 4. 0~2 7. Omm 2 Z s, more preferably from 5.6 to 1 6. 3 is mm 2 / s, more preferably from 9. 3~1 2. 5 mm 2 / s , is properly especially preferred is 9. 3~ 1 1. Omm 2 Z s .

Kinematic viscosity at 40 ° C also is not particularly limited, preferably 1 4. more preferably 0 to 20 Omm was 2 / s ,, 20~: a 1 1 0 mm 2 Z s, further better good Ku is the AO e Omn ^ Z s, particularly preferably Ru 45~55mm 2 Zs der.

The lubricating oil composition of the present invention preferably has a kinematic viscosity at 1 00 ° C after shearing is 9. 3 mm V s or more.

Viscosity grade of the lubricating oil composition of the present invention is preferably in the range of SAE 20, 30, 40, 50, more preferably in the range of S AE 20, 30, in particular SAE 30, 0W- 30, 5W- 30, 1 is preferably 0 W- 30.

The viscosity index of the lubricating oil composition of the present invention, from the viewpoint of improving the first temperature characteristic and fuel savings viscosity is usually 1 60 or more, preferably 1 70 or more, more preferably 1 80 on more than the shear from the viewpoint of excellent stability and high-temperature detergency and base number retention properties, rather preferably 250 or less, more preferably 220 or less, more preferably 200 or less, preferably especially at 1 90 or less.

NOACK evaporation loss of the lubricating oil composition of the present invention is not particularly limited, usually 20 mass% or less, preferably 1 6% by weight, more preferably 1 0 to 1 5 mass. It is. NOACK evaporation amount is more than 20 wt%, the lubricating oil evaporation loss amount is large becomes for good Mashikunare.

TB S viscosity at 1 50 ° C of the lubricating oil composition of the present invention, for example in SAE (xW I) 30 Grade, the balance between the friction reducing effect in sufficient oil film retention and fluid lubrication region, 2. 9 mP a · s or more, 3. 7 m P a · s less than the it is favorable preferred, more preferably 3. 2 mP a · s, more preferably not more than 3 mP a · s.

TB S viscosity at 1 00 ° C of the lubricating oil composition of the present invention, for example in SAE (xW I) 30 Grade, the balance between the friction reducing effect in sufficient oil film retention and fluid lubrication region, 7MP a · s preferably less which, 6. 6mP a · s or less under more preferably, 6. 3mP a · s or less is more preferred, and preferably 5mP at a · s or higher, more preferably at least 6MP a · s .

Here, the term refers TBS (Taperd bearing simulator) viscosity, shows the effective viscosity under cross does not high temperature and high in AS TM D 4683 (Standard Test Method for Measuring Viscosity at High Shear Rate and High Temperature by Tapered Bearing Simulator) as measured by conforming to the method, the viscosity of definitive shear rate l O e / s (where the temperature conditions were 1 50 ° C or 1 00 ° C.) is that the. Preferably the sulfated ash content of the lubricating oil composition of the present invention is 0.1 to 2 wt%, more preferably from 0.2 to 1 wt%, more preferably 0.4 to 0.8 mass. / 0.

The lubricating oil composition of the present invention, motorcycles, automobiles, power generation, Gasorinenji emissions of marine such as diesel engines, it is possible to use preferably used as a lubricating oil for internal combustion engine such as a gas engine, especially for motor vehicles, In particular it is possible to use preferably used as a diesel engine. Or other anti-wear performance and lubricating oil long drain performance is required, for example, automatic or manual transmission drive system for lubricating oils such as, wet brake, oil pressure hydraulic oil, turbine oil, compressor oil, bearing oil,. Refrigerating machine oil even the lubricating oil and the like can be suitably used.

[Industrial Applicability]

The lubricating oil composition of the present invention, as a lubricating oil for internal combustion engines, industrial applicability for by reducing lubrication resistance is possible to further improve the saving fuel consumption performance is large.

[Example] '

The present invention is specifically described by examples below, but the present invention is not shall be limited thereto.

(Example 1-2,. Comparative Example 1-2)

As shown in Table 1, various lubricating oils were prepared and measured for friction torque reduction rate. The results are shown in Table 1.

(Measurement of the friction torque reduction rate)

Measurement of friction torque reduction rate was measured friction torque in the following conditions using the engine motoring friction test.

Engine: 2 L class series four-cylinder roller type dynamic valve system engine of

Engine speed: 7 5 0~3 0 0 0 r / min

Oil temperature: 6 0, 8 0, 1 0 0 ° C

Reference oil: commercially available 5 W 3 0 oil

Incidentally, when the evaluation of the friction torque reduction rate, the average value of the friction torque in each condition was measured, as compared with the case of using the reference oil was calculated friction torque reduction rate.

As shown in Table 1, implementation PSSI is blended 1 0 styrene one Genco Example 1 and PSSI polymer an based viscosity index improver blended is a polymethacrylic rate based viscosity index improver of 5 to lubricating base oils example 2 is seen to commercial 5 W- 3 0 oil pairs and friction torque reduction rate is improved as the reference oil. This effect is based on the prior art concept, compared with Comparative Examples 1 and 2 formulated with PSSI high polymethacrylic rate based viscosity index improver, it can be seen that a substantial friction torque reduction rate. table 1

1)% C A: 0, % C P /% C N: 6.5, sulfur content: 0 mass PP m, 100 ° C kinematic viscosity: 4.1 mm 2 / s, viscosity index: 123,

40 ° C kinematic viscosity: 18.6mm 2 / s, NOACK evaporation amount: 13 wt%

2)% G A: 0, % C P /% C N: 4.2 sulfur content: 0 mass ppm, 100 ° C kinematic viscosity: 4.3 mm 2 / s, viscosity index: 123,

40 ° C kinematic viscosity: 20.0mm 2 / s, NOAGK evaporation: 14 wt%)

3) Styrene one diene-based viscosity index improver having a polystyrene block monohydrate iodination polyisoprene block, a weight average molecular weight: 90,000, PSSI: 10

4) polymethacrylate viscosity index improver, weight-average molecular weight: 100,000, PSSI: 5

5) polymethacrylate viscosity index improver, weight-average molecular weight: 400,000, PSSI: 45

6) di n- butyl phosphate zinc, phosphorus content: 13.2 wt%, sulfur content: 0 mass%, zinc content: 13.0 wt%

7) overbased Ga sulfonates, base value (ASTM: D-2895): 325mgKOH / g, Ca: 12.7 wt% S: 2 mass%, metal ratio: 1 0

8) The number average molecular weight of polybutenyl succinimide (polybutenyl group: 1300) and its mixture with boric acid-reactive compound

9) phenol-based and amine-based antioxidant (1: 1)

10) O carboxymethyl molybdenum tridecyl § Min complexes, Mo: 10 wt%

Claims

The scope of the claims
1. lubricating base oil, PSSI the 30 following viscosity index improvers, viscosity index of 1 60 or more compositions, cut 1 00 ° C kinematic viscosity reduction rate of 1 5% and Do so that after shearing the lubricating oil composition characterized by being formulated.
2. The viscosity index improver, the lubricating oil composition according to claim 1, wherein the PSSI of 30 or less of styrene one Genco polymeric viscosity index improver.
3. The viscosity index improver, the lubricating oil composition according to claim 1, wherein the PSSI of 1 5 less polymethacrylic rate based viscosity index improver.
4. 1 00 ° CTB S viscosity lubricating oil composition according to any one of claims 1-3, characterized in that at most 7MP a · s for the composition.
5. The lubricating oil composition is a 1 00 ° C kinematic viscosity of the composition 9. 3~1 1. 0 mm 2 / s , 40 ° C kinematic viscosity of 40 to 60 mm 2 / s, after shearing 1 00 ° C kinematic viscosity lubricating oil composition according to any one of claims 1-4, characterized in that 9 is 3 mm 2 / s or more.
6. Lubricating oil composition according to any one of claims 1 to 5, characterized in that it contains a metal salt of a phosphorus-containing acid esters.
7. metallic detergent, lubricating oil composition according to any one of claims 1 to 6, characterized in that it contains ashless dispersants and antioxidants.
8. The lubricating oil composition according to any one of 請 Motomeko 1-7, wherein the sulfated ash content of the composition is from 0.1 to 2 wt%.
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