Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M169/00—Lubricating 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
  • C10M169/02—Mixtures of base-materials and thickeners
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
  • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
  • C10M137/04—Phosphate esters
  • C10M137/10—Thio derivatives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M169/00—Lubricating 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
  • C10M169/04—Mixtures of base-materials and additives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
  • C10M171/02—Specified values of viscosity or viscosity index
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
  • C10M171/04—Specified molecular weight or molecular weight distribution
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
  • C10M2201/085—Phosphorus oxides, acids or salts
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/102—Aliphatic fractions
  • C10M2203/1025—Aliphatic fractions used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/003—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
  • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
  • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/26—Overbased carboxylic acid salts
  • C10M2207/262—Overbased carboxylic acid salts derived from hydroxy substituted aromatic acids, e.g. salicylates
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
  • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
  • C10M2215/28—Amides; Imides
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
  • C10M2223/045—Metal containing thio derivatives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2290/00—Mixtures of base materials or thickeners or additives
  • C10M2290/10—Thickener
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2010/00—Metal present as such or in compounds
  • C10N2010/04—Groups 2 or 12
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/02—Viscosity; Viscosity index
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/04—Molecular weight; Molecular weight distribution
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
  • C10N2020/01—Physico-chemical properties
  • C10N2020/071—Branched chain compounds
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/02—Pour-point; Viscosity index
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/04—Detergent property or dispersant property
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/74—Noack Volatility
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/02—Bearings
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/25—Internal-combustion engines

Definitions

• the present invention relates to a lubricating oil composition.
• a lubricating oil composition having a low viscosity, a low evaporation property, and an excellent performance of appropriately holding an oil film on a sliding portion inside an engine (hereinafter, also referred to as "oil film holding property").
• the lubricating oil composition is also required to have high temperature cleanliness from the viewpoint of making the lubricating oil composition excellent in long drainage and the like.
• the lubricating oil composition is also required to have a performance of enhancing compatibility with a rubber material used for a sealing material or the like and suppressing swelling or curing of the rubber material.
• a lubricating oil composition that satisfies all of these requirements has not yet been fully studied.
• An object of the present invention is to provide a lubricating oil composition having low viscosity, low evaporation property, excellent oil film retention, high temperature cleanliness, and excellent compatibility with rubber materials.
• the olefin polymer (A1) contains a first olefin polymer (A1-1) having a kinematic viscosity of 3.0 mm 2 / s or more at 100 ° C., and the first olefin polymer (A1-1). ) Is 30% by mass or more based on the total amount of the base oil (A).
• the olefin-based polymer (A1) does not contain the second olefin-based polymer (A1-2) having a kinematic viscosity of less than 3.0 mm 2 / s at 100 ° C., or even if it contains the base oil (based oil). It is less than 18.5% by mass based on the total amount of A).
• the content of the resin content (B1) derived from the viscosity index improver (B) is 0.01% by mass or more based on the total amount of the lubricating oil composition.
• the nitrogen atom content derived from the imide-based dispersant (C) is 0.06% by mass or more based on the total amount of the lubricating oil composition.
• the content ratio [(B1) / (A1-1)] of the resin component (B1) derived from the viscosity index improver (B) and the first olefin polymer (A1-1) is a mass ratio. It is over 0.001
• the kinematic viscosity at 100 ° C. is 5.0 mm 2 / s or more and less than 7.1 mm 2 / s.
• [2] A method for lubricating an internal combustion engine using the lubricating oil composition according to the above [1].
• a lubricating oil composition having low viscosity, low evaporation property, excellent oil film retention, high temperature cleanliness, and excellent compatibility with rubber materials. ..
• the lower limit value and the upper limit value described stepwise can be combined independently.
• the “preferable lower limit value (10)” and the “more preferable upper limit value (60)” are combined to obtain “10 to 60". You can also do it.
• the numerical values of Examples are numerical values that can be used as upper limit values or lower limit values.
• the numerical range expressed as "AA to BB” shall mean "AA or more and BB or less" unless otherwise specified.
• the mass average molecular weight (Mw) and the number average molecular weight (Mn) of each component are values in terms of standard polystyrene measured by a gel permeation chromatography (GPC) method, and specifically, Examples. Means the value measured by the method described in.
• GPC gel permeation chromatography
• kinematic viscosity at 40 ° C.” is also referred to as “40 ° C. kinematic viscosity”.
• kinematic viscosity at 100 ° C.” is also referred to as “100 ° C. kinematic viscosity”.
• the lubricating oil composition of the present invention is a lubricating oil composition containing a base oil (A) containing an olefin polymer (A1), a viscosity index improver (B), and an imide-based dispersant (C).
• the olefin polymer (A1) contains a first olefin polymer (A1-1) having a kinematic viscosity of 3.0 mm 2 / s or more at 100 ° C., and the first olefin polymer (A1-1). ) Is 30% by mass or more based on the total amount of the base oil (A).
• the olefin-based polymer (A1) does not contain the second olefin-based polymer (A1-2) having a kinematic viscosity of less than 3.0 mm 2 / s at 100 ° C., or even if it contains the base oil (based oil). It is less than 18.5% by mass based on the total amount of A).
• the content of the resin content (B1) derived from the viscosity index improver (B) is 0.01% by mass or more based on the total amount of the lubricating oil composition.
• the nitrogen atom content derived from the imide-based dispersant (C) is 0.06% by mass or more based on the total amount of the lubricating oil composition.
• the content ratio [(B1) / (A1-1)] of the resin content (B1) and the first olefin polymer (A1) is more than 0.001 by mass ratio.
• the kinematic viscosity at 100 ° C. is 5.0 mm 2 / s or more and less than 7.1 mm 2 / s.
• the present inventor has diligently studied low-viscosity lubricating oil compositions having a kinematic viscosity at 100 ° C. in the range of 5.0 mm 2 / s or more and less than 7.1 mm 2 / s. Stacked.
• a base oil containing a specific amount of a specific olefin polymer but having a small content of another olefin polymer different from the specific olefin polymer is used, and a resin derived from a viscosity index improver is used.
• the amount and the specific olefin polymer are adjusted to a specific ratio, the content of the resin content derived from the viscosity index improver, the content of the imide-based dispersant, etc. are adjusted to a specific range, and the aniline point is further adjusted. It has been found that a lubricating oil composition adjusted to a specific range can solve the above-mentioned problems.
• the present inventor has further conducted various studies based on such findings, and has completed the present invention.
• base oil (A) viscosity index improver (B)"
• imide-based dispersant (C) are referred to as “component (A)” and “component (B), respectively.”
• component (C) The lubricating oil composition of one aspect of the present invention may be composed of only the component (A), the component (B), and the component (C), but the component (A) may be composed as long as the effect of the present invention is not impaired. ), Component (B), and components other than component (C) may be contained.
• the total content of the component (A), the component (B), and the component (C) is preferably 70% by mass to 100% by mass based on the total amount of the lubricating oil composition. %, More preferably 75% by mass to 100% by mass, still more preferably 80% by mass to 100% by mass.
• each component contained in the lubricating oil composition of the present invention will be described in detail.
• the lubricating oil composition of the present invention contains a base oil (A) containing an olefin polymer (A1).
• the olefin polymer (A1) contains a first olefin polymer (A1-1) having a kinematic viscosity of 3.0 mm 2 / s or more at 100 ° C.
• the content of the first olefin polymer (A1-1) is 30% by mass or more based on the total amount of the base oil (A). If the content of the first olefin polymer (A1-1) is less than 30% by mass based on the total amount of the base oil (A), the lubricating oil composition cannot be made low in evaporability.
• the 100 ° C. kinematic viscosity of the first olefin polymer (A1-1) is preferably 3.1 mm 2 / s or more, more preferably 3.1 mm 2 / s or more, from the viewpoint of facilitating the preparation of a low evaporative lubricating oil composition. It is 3.2 mm 2 / s or more, more preferably 3.3 mm 2 / s or more. Further, from the viewpoint of facilitating the fuel efficiency of the lubricating oil composition, the kinematic viscosity of the olefin polymer (A1) at 100 ° C. is preferably 7.0 mm 2 / s or less, more preferably 5.0 mm.
• the 100 ° C. kinematic viscosity of the base oil is a value measured in accordance with JIS K2283: 2000.
• the content of the first olefin polymer (A1-1) is preferably 40% by mass or more based on the total amount of the base oil (A) from the viewpoint of facilitating the preparation of a low-evaporative lubricating oil composition. It is 100% by mass, more preferably 50% by mass to 100% by mass, and further preferably 60% by mass to 100% by mass.
• the first olefin polymer (A1-1) will be described in detail.
• the first olefin-based polymer (A1-1) is a polymer containing a structural unit (a1) derived from an ⁇ -olefin (hereinafter, also referred to as “monomer (a1)”).
• a1 ⁇ -olefin
• the carbon number of the monomer (a1) is preferably 6 or more, more preferably 8 or more, from the viewpoint of facilitating the effect of the present invention. Further, it is preferably 20 or less, more preferably 16 or less, and further preferably 12 or less. The upper and lower limits of these numerical ranges can be arbitrarily combined.
• the monomer (a1) may be linear or branched. Specific examples of the monomer (a1) are preferably 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1 -Pentadecene, 1-hexadecene, 1-heptene, 1-octadecene, 1-nonadecene, and 1-eikosen can be mentioned.
• 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, and 1-heptadecene are more preferable
• 1- Octene, 1-nonene, 1-decene, 1-undecene, and 1-dodecene are more preferred, and 1-decene is even more preferred.
• the monomer (a1) one type may be used alone, or two or more types may be used in combination.
• the first olefin polymer (A1-1) preferably contains 1-decene as the monomer (a1).
• the content of 1-decene is preferably 80 to 100% by mass, more preferably 90 to 100% by mass, still more preferably 95 to 100% by mass, based on the total amount of the monomers constituting the first olefin polymer (A1-1). It is 100% by mass, more preferably 100% by mass.
• the first olefin-based polymer (A1-1) contains an ⁇ -olefin other than 1-decene as the monomer (a1)
• the ⁇ -olefin other than 1-decene is listed as the monomer (a1).
• one or more selected from ⁇ -olefins other than 1-decene can be mentioned.
• the first olefin polymer (A1-1) preferably contains a dimer to a pentamer of the monomer (a1), and the dimer to 4-4. More preferably, it contains a trimer, and even more preferably it contains a trimer.
• the monomer (a1) is 1-decene
• the first olefin polymer (A1-1) preferably contains a decentrimer.
• the first olefin polymer (A1-1) has a reduced terminal vinylidene double bond by hydrogenation treatment. It is preferable that it is. That is, the first olefin polymer (A1-1) is preferably a partially hydride, and more preferably a completely hydride.
• the polymerization method of the first olefin-based polymer (A1-1) is not particularly limited, and a known method (for example, a known method capable of polymerizing the first olefin-based polymer (A1-1) by a polymerization reaction of ⁇ -olefin) is possible. , A polymerization method using an acid catalyst such as BF 3 catalyst) can be appropriately adopted.
• the metallocene catalyst is used. It is preferable to adopt the polymerization method used.
• a complex containing a Group 4 element and having a conjugated carbon 5-membered ring is preferable.
• the Group 4 element include one or more selected from titanium, zirconium, and hafnium, and among these, zirconium is preferable.
• the complex having a conjugated carbon 5-membered ring a complex having a substituted or unsubstituted cyclopentadienyl ligand is preferable.
• metallocene catalyst examples include bis (n-octadecylcyclopentadienyl) zirconium dichloride, bis (trimethylsilylcyclopentadienyl) zirconium dichloride, bis (tetrahydroindenyl) zirconium dichloride, and bis [(t-butyldimethylsilyl).
• Cyclopentadienyl] zirconium dichloride bis (di-t-butylcyclopentadienyl) zirconium dichloride, (ethylidene-bisindenyl) zirconium dichloride, biscyclopentadienyl zirconium dichloride, etilidenbis (tetrahydroindenyl) zirconium dichloride, and , Bis [3,3 (2-methyl-benzindenyl)] dimethylsilanediyl zirconium dichloride and the like.
• One type of metallocene catalyst may be used alone, or two or more types may be used in combination.
• an oxygen-containing organoaluminum compound may be used together with the metallocene catalyst as the co-catalyst.
• the oxygen-containing organoaluminum compound include methylarmoxane, ethylarmoxane, isobutylarmoxane and the like.
• the oxygen-containing organoaluminum compound one type may be used alone, or two or more types may be used in combination.
• the mixing ratio of co-catalyst to metallocene catalyst is from the viewpoint of obtaining a first olefin polymer (A1-1) that makes it easier to exert the effects of the present invention. Therefore, the molar ratio is preferably 5 to 1000, more preferably 7 to 500, and even more preferably 10 to 200.
• the first olefin polymer (A1-1) is preferably produced through the following steps (i) to (iii).
• Step (i) A step of polymerizing the monomer (a1) using a metallocene catalyst.
• -Step (ii) A step of treating the polymer obtained in step (i) with an alkali.
• -Step (iii) A step of hydrogenating the polymer after being treated with alkali in the step (iii).
• Step (i) The step (i) may be carried out in a batch manner or in a continuous manner. Further, the above-mentioned oxygen-containing organoaluminum compound as a co-catalyst may be used together with the metallocene catalyst.
• the polymerization of the monomer (a1) may proceed in the presence of one or more organic solvents selected from benzene, ethylbenzene, toluene and the like.
• the polymerization reaction in the step (i) is preferably carried out under the conditions of a reaction temperature of 15 to 100 ° C. and a reaction pressure of atmospheric pressure to 0.2 MPa. After the polymerization has proceeded sufficiently, the reaction can be stopped by adding water or alcohol.
• the step (ii) is a step of treating the polymer obtained in the step (i) with an alkali to remove catalyst components such as a metallocene catalyst and an oxygen-containing organoaluminum compound.
• the alkali used in the step (ii) include one or more selected from sodium hydroxide, sodium carbonate, sodium hydrogen carbonate and the like.
• a solution prepared by dissolving these alkalis in water or an alcohol such as methanol, ethanol, or propanol is added to the reaction solution containing the polymer, and then the mixture is sufficiently stirred to perform a liquid separation operation to form an organic layer. By taking it out, the catalyst component can be removed.
• the pH of the solution is preferably 9 or higher.
• the temperature of the solution is preferably 20 to 100 ° C.
• the step (iii) is a step of hydrogenating the polymer after the treatment with alkali in the step (iii) to convert the polymer into a hydride.
• the hydride may be a partially hydride, but is preferably a complete hydride.
• the hydrogenation treatment in the step (iii) is carried out by filling a system containing a polymer with hydrogen gas and heating in the presence of a metal catalyst.
• a metal catalyst used in the hydrogenation treatment for example, one or more selected from nickel-based catalysts, cobalt-based catalysts, palladium-based catalysts, platinum-based catalysts and the like can be used, and specifically, diatomaceous soil-supported nickel. Examples thereof include one or more selected from catalysts, cobalt trisacetylacetonate / organic aluminum catalysts, activated carbon-supported palladium catalysts, alumina-supported platinum catalysts and the like.
• the temperature condition of the hydrogenation treatment is usually 200 ° C. or lower, and is appropriately set depending on the type of metal catalyst used. For example, when a nickel-based catalyst is used, the temperature is preferably 150 to 200 ° C. When a palladium-based catalyst or a platinum-based catalyst is used, the temperature is preferably 50 to 150 ° C. When a homogeneous reducing agent such as cobalt trisacetylacetonate / organoaluminum is used, the temperature is preferably 20 to 100 ° C. Further, the hydrogen pressure at the time of hydrogenation treatment is preferably normal pressure to 20 MPa.
• distillation treatment After the hydrogenation treatment, it is preferable to carry out a distillation treatment to remove by-products.
• the distillation treatment is preferably carried out under the conditions of a temperature of 180 to 450 ° C. and a pressure of 0.01 to 100 kPa.
• the olefin polymer (A1) does not contain the second olefin polymer (A1-2) having a kinematic viscosity of less than 3.0 mm 2 / s at 100 ° C. Or, even if it is contained, it is less than 18.5% by mass based on the total amount of the base oil (A). If the content of the second olefin polymer (A1-2) is 18.5% by mass or more based on the total amount of the base oil (A), the lubricating oil composition cannot be made low in evaporability.
• the content of the second olefin polymer (A1-2) is preferably as small as possible from the viewpoint of facilitating the preparation of a low-evaporation lubricating oil composition.
• the content of the second olefin polymer (A1-2) is preferably 0% by mass to 15% by mass, more preferably 0% by mass to 10% by mass, based on the total amount of the base oil (A). %, More preferably 0% by mass to 5% by mass, even more preferably 0% by mass to 1% by mass, and even more preferably no second olefin polymer (A1-2).
• the second olefin polymer (A1-2) one type may be used alone, or two or more types may be used in combination. Further, the second olefin polymer (A1-2) is produced, for example, by using the same method as the above-mentioned production method of the first olefin polymer (A1-1) and changing the distillation temperature or the like. can do.
• the base oil (A) may contain another base oil different from the above base oil.
• the base oil (A) is other than the mineral oil (A2) and the first olefin polymer (A1-1) and the second olefin polymer (A1-2). It may contain one or more selected from the group consisting of the synthetic oil (A3) of.
• the content of the other base oil is 70% by mass or less based on the total amount of the base oil (A), but from the viewpoint of facilitating the effect of the present invention, it is preferably 0% by mass to 60% by mass. , More preferably 0% by mass to 50% by mass, still more preferably 0% by mass to 40% by mass.
• mineral oil (A2) and synthetic oil (A3) will be described in detail.
• mineral oil (A2) a general mineral oil used as a lubricating oil base oil can be used without particular limitation as long as the effects of the present invention are not impaired.
• Specific examples of the mineral oil (A2) include atmospheric residual oil obtained by atmospheric distillation of crude oils such as paraffin crude oil, intermediate base crude oil, and naphthenic crude oil; these atmospheric residual oils are obtained by vacuum distillation. Distillate oil; Mineral oil obtained by subjecting the distillate oil to one or more treatments such as solvent desorption, solvent extraction, hydrocracking, solvent dewaxing, contact dewaxing, hydrorefining, etc .; wax isomerized mineral oil And so on.
• the mineral oil (A2) one type may be used alone, or two or more types may be used in combination.
• the content of the mineral oil (A2) is preferably 50% by mass or less, more preferably 40% by mass, based on the total amount of the base oil (A). % Or less, more preferably 35% by mass or less.
• the lubricating oil composition of one aspect of the present invention it is preferable to add a certain amount or more of the mineral oil (A2) within a range in which the content of the mineral oil (A2) does not exceed the above upper limit value.
• This makes it easier to adjust the aniline point of the lubricating oil composition to 95 ° C. or higher while suppressing the cost of the base oil (A), making it easier to improve compatibility with the rubber material, and swelling and the effect of the rubber material. It is also possible to make it easier to exert the effect of suppressing.
• the content of the mineral oil (A2) is preferably 10% by mass or more, more preferably 20% by mass or more, still more preferably 25% by mass or more, based on the total amount of the base oil (A).
• the total content of the first olefin polymer (A1-1) and the mineral oil (A2) is preferably 70% by mass to 100% by mass, more preferably, based on the total amount of the base oil (A). Is 80% by mass to 100% by mass, more preferably 90% by mass to 100% by mass, still more preferably 95% by mass to 100% by mass, and even more preferably 100% by mass.
• the content ratio [(A1-1) / (A2)] of the first olefin polymer (A1-1) and the mineral oil (A2) is preferably 50/50 or more in terms of mass ratio. It is preferably 60/40 or more, more preferably 65/35 or more. Further, it is preferably 90/10 or less, more preferably 80/20 or less, and further preferably 75/25 or less. The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 50/50 to 90/10, more preferably 60/40 to 80/20, and even more preferably 65/35 to 75/25.
• the 100 ° C. kinematic viscosity of the mineral oil (A2) is preferably 1.0 mm 2 / s or more, more preferably 1.5 mm 2 / s or more, still more preferably 2.0 mm, from the viewpoint of facilitating the effect of the present invention. It is 2 / s or more. Further, it is preferably 7.5 mm 2 / s or less, more preferably 5.0 mm 2 / s or less, and further preferably 3.5 mm 2 / s or less. The upper and lower limits of these numerical ranges can be arbitrarily combined.
• the viscosity index of the mineral oil (A2) is preferably 90 or more, more preferably 95 or more, and further preferably 100 or more.
• the kinematic viscosity and the viscosity index of the mixture may be within the above ranges.
• Synthetic oil (A3)) As the synthetic oil (A3), a general synthetic oil used as a lubricating oil base oil can be used without particular limitation as long as the effects of the present invention are not impaired.
• Specific examples of the synthetic oil (A3) include polyphenyl ether, alkylbenzene, alkylnaphthalene, polyphenyl hydrocarbon, ester oil, naphthenic synthetic oil, glycol synthetic oil, and natural gas by the Fisher-Tropsch method. Examples thereof include GTL base oil obtained by isomerizing the produced wax (GTL wax (Gas To Liquids WAX)).
• the content of the synthetic oil (A3) is 70% by mass or less based on the total amount of the base oil (A), but the effect of the present invention is more exhibited. From the viewpoint of facilitating the production, it is preferably 0% by mass to 60% by mass, more preferably 0% by mass to 50% by mass, and further preferably 0% by mass to 40% by mass.
• the base oil (A) Is preferably free of ester oil (A3-1).
• the ester oil (A3-1) is contained, it is preferably 15% by mass or less, more preferably 10% by mass or less, based on the total amount of the base oil (A).
• the base oil (A) does not contain the naphthenic synthetic oil (A3-2).
• the naphthenic synthetic oil (A3-2) is contained, it is preferably 15% by mass or less, more preferably 10% by mass or less, based on the total amount of the base oil (A).
• the lubricating oil composition of the present invention contains a viscosity index improver (B).
• the content of the resin content (B1) derived from the viscosity index improver (B) in the lubricating oil composition of the present invention is 0.01% by mass or more based on the total amount of the lubricating oil composition. If the content of the resin content (B1) derived from the viscosity index improver (B) is less than 0.01% by mass based on the total amount of the lubricating oil composition, sufficient oil film retention cannot be ensured.
• the content of the resin component (B1) derived from the viscosity index improver (B) is preferably 0.10 mass based on the total amount of the lubricating oil composition. % Or more, more preferably 0.30% by mass or more, still more preferably 0.50% by mass or more. Further, from the viewpoint of the shear stability of the viscosity index improver (B), it is preferably 5.0% by mass or less, more preferably 4.0% by mass or less, and further preferably 3.0% by mass or less. Yes, and even more preferably 1.5% by mass or less. The upper and lower limits of these numerical ranges can be arbitrarily combined.
• it is preferably 0.10% by mass to 5.0% by mass, more preferably 0.30% by mass to 4.0% by mass, still more preferably 0.50% by mass to 3.0% by mass, and more. More preferably, it is 0.50 to 1.5% by mass.
• the "resin content (B1) derived from the viscosity index improver (B)” means a polymer having a mass average molecular weight (Mw) of 1,000 or more and having a certain repeating unit.
• the mass average molecular weight (Mw) of the resin component (B1) derived from the viscosity index improver (B) is determined in use in a wide temperature environment from a low temperature region to a high temperature region.
• it is preferably 200,000 to 1,000,000, more preferably 200,000 to 800,000. , More preferably 200,000 to 700,000.
• the molecular weight distribution (Mw / Mn) of the resin content (B1) derived from the viscosity index improver (B) (where Mw is the mass average molecular weight of the resin content (B1)).
• Mn indicates the number average molecular weight of the resin content (B1)), preferably 8.00 or less, more preferably 7.00 or less, more preferably from the viewpoint of improving the fuel saving performance of the lubricating oil composition. It is 6.50 or less, more preferably 6.00 or less, still more preferably 5.00 or less, and even more preferably 3.00 or less.
• the molecular weight distribution of the resin content (B1) is not particularly limited as a lower limit value, but is usually 1.01 or more, preferably 1.05 or more, and more preferably 1.10 or more.
• the resin component (B1) derived from the viscosity index improver (B) is selected from, for example, non-dispersive polymethacrylate, dispersed polymethacrylate, comb-shaped polymer and the like1 Includes seeds and above.
• the resin component (B1) may contain other resin components and the like as long as the effects of the present invention are not impaired.
• the resin component (B1) derived from the viscosity index improver (B) is a comb-shaped polymer (B1).
• B1-1) is preferable.
• the comb-shaped polymer (B1-1) will be described in detail.
• the "comb-shaped polymer (B1-1)" refers to a polymer having a structure having a large number of three-pronged branch points in the main chain where high molecular weight side chains appear.
• the mass average molecular weight (Mw) of the comb-shaped polymer (B1-1) is preferably 100,000 or more, more preferably 200,000 or more, still more preferably 250,000 or more, still more preferably, from the viewpoint of improving fuel efficiency. It is 300,000 or more, and even more preferably 350,000 or more.
• it is preferably 1 million or less, more preferably 800,000 or less, further preferably 750,000 or less, still more preferably 700,000 or less, still more preferably 650,000 or less.
• the upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 100,000 to 1,000,000, more preferably 200,000 to 800,000, still more preferably 250,000 to 750,000, even more preferably 300,000 to 700,000, and even more preferably 350,000 to 650,000. Is.
• Mw / Mn the molecular weight distribution (Mw / Mn) of the comb polymer (B1-1) (where Mw indicates the mass average molecular weight of the comb polymer (B1-1) and Mn indicates the number average molecular weight of the comb polymer (B1-1)).
• Mw indicates the mass average molecular weight of the comb polymer (B1-1)
• Mn indicates the number average molecular weight of the comb polymer (B1-1).
• Mw indicates the mass average molecular weight of the comb polymer (B1-1)
• Mn the number average molecular weight of the comb polymer (B1-1)
• the molecular weight distribution of the comb polymer (B1-1) is not particularly limited as a lower limit value, but is usually 1.01 or more, preferably 1.05 or more, and more preferably 1.10 or more.
• the content of the comb-shaped polymer (B1-1) is preferably 0.10% by mass or more, more preferably 0.30% by mass, based on the total amount of the lubricating oil composition. The above is even more preferably 0.50% by mass or more. Further, in the lubricating oil composition of one aspect of the present invention, the content of the comb-shaped polymer (B1-1) is preferably 5.0% by mass or less, more preferably 4 based on the total amount of the lubricating oil composition. It is 0.0% by mass or less, and more preferably 3.0% by mass or less.
• the SSI (shear stability index) of the comb polymer (B1-1) is preferably 12.0 or less, more preferably 10.0 or less, still more preferably 5.0 or less, still more preferably 3.0 or less. Even more preferably, it is 1.0 or less.
• the SSI of the comb polymer (B1-1) is not particularly limited to a lower limit, but is usually 0.1 or more, preferably 0.2 or more.
• the SSI (shear stability index) of the comb polymer (B1-1) indicates the decrease in viscosity due to shearing derived from the resin content in the comb polymer (B1-1) as a percentage, and is ASTM. It is a value measured according to D6278. More specifically, it is a value calculated from the following formula (1).
• Kv 0 is the value of the kinematic viscosity of the sample oil obtained by diluting the viscosity index improver containing a resin content with mineral oil at 100 ° C.
• Kv 1 is the value of the viscosity index containing the resin content. It is the value of the kinematic viscosity at 100 ° C. after passing the sample oil obtained by diluting the agent with mineral oil through a 30-cycle high shear diesel injector according to the procedure of ASTM D6278.
• Kv oil is the value of the kinematic viscosity of the mineral oil used when diluting the viscosity index improver at 100 ° C.
• the SSI value of the comb polymer (B1-1) changes depending on the structure of the comb polymer (B1-1). Specifically, there is a tendency shown below, and by considering these matters, the SSI value of the comb polymer (B1-1) can be easily adjusted.
• the following items are merely examples and can be adjusted by considering items other than these items.
• -The side chain of the comb-shaped polymer (B1-1) is composed of a macromonomer (x1), and the content of the structural unit (X1) derived from the macromonomer (x1) is 0.5 based on the total amount of the structural unit.
• Comb-shaped polymers having a molar% or more tend to have a low SSI value.
• the larger the molecular weight of the macromonomer (x1) constituting the side chain of the comb-shaped polymer (B1-1) the lower the SSI value tends to be.
• a polymer having at least a structural unit (X1) derived from a macromonomer (x1) is preferable.
• This structural unit (X1) corresponds to the above-mentioned "high molecular weight side chain".
• the above-mentioned "macromonomer” means a high molecular weight monomer having a polymerizable functional group, and is preferably a high molecular weight monomer having a polymerizable functional group at the terminal.
• the comb-shaped polymer (B1-1) whose main chain is relatively longer than the side chain has lower shear stability. It is considered that this property contributes to the improvement of fuel efficiency even in a low temperature region around 50 ° C.
• the content of the structural unit (X1) is preferably 0. It is 1 mol% or more and less than 10 mol%, more preferably 0.2 to 7 mol%, still more preferably 0.3 to 5 mol%, still more preferably 0.5 to 3 mol%.
• the content of each structural unit in the comb-shaped polymer (B1-1) means a value calculated by analyzing the 13 C-NMR quantitative spectrum.
• the number average molecular weight (Mn) of the macromonomer (x1) is preferably 300 or more, more preferably 500 or more, still more preferably 1,000 or more, still more preferably 2,000 or more, and particularly preferably 2,000 or more. It is 4,000 or more, preferably 100,000 or less, more preferably 50,000 or less, still more preferably 20,000 or less, still more preferably 10,000 or less.
• the macromonomer (x1) may have, for example, one or more repeating units represented by the following general formulas (i) to (iii) in addition to the above-mentioned polymerizable functional group.
• R b1 represents a linear or branched alkylene group having 1 to 10 carbon atoms, and specifically, a methylene group, an ethylene group, a 1,2-propylene group, 1,3. -Propylene group, 1,2-butylene group, 1,3-butylene group, 1,4-butylene group, pentylene group, hexylene group, heptylene group, octylene group, nonylene group, decylene group, and 2-ethylhexylene group. And so on.
• R b2 represents a linear or branched alkylene group having 2 to 4 carbon atoms, and specifically, an ethylene group, a 1,2-propylene group, or a 1,3-propylene group. , 1,2-butylene group, 1,3-butylene group, 1,4-butylene group and the like.
• R b3 represents a hydrogen atom or a methyl group.
• R b4 represents a linear or branched alkyl group having 1 to 10 carbon atoms, and specifically, a methyl group, an ethyl group, an n-propyl group, an n-butyl group, an n-pentyl group, or n-.
• R b1 , R b2 , R b3 , and R b4 may be the same or different from each other. It may be a thing.
• the macromonomer (x1) is preferably a polymer having a repeating unit represented by the general formula (i), and R b1 in the general formula (i) is 1, More preferably, it is a polymer having a repeating unit (X1-1) which is a 2-butylene group and / or a 1,4-butylene group.
• the content of the repeating unit (X1-1) is preferably 1 to 100 mol%, more preferably 20 to 95 mol%, still more preferably, based on the total amount (100 mol%) of the constituent units of the macromonomer (x1). Is 40 to 90 mol%, more preferably 50 to 80 mol%.
• the macromonomer (x1) is a copolymer having two or more repeating units selected from the general formulas (i) to (iii)
• the form of copolymerization is a block copolymer. It may be a random copolymer or a random copolymer.
• the comb-shaped polymer (B1-1) used in one embodiment of the present invention may be a homopolymer consisting of only a structural unit (X1) derived from one type of macromonomer (x1), or two or more types of macromonomers (x1). It may be a copolymer containing a structural unit (X1) derived from. Further, the comb-shaped polymer (B1-1) used in one embodiment of the present invention has a structural unit derived from a macromonomer (x1) and a structural unit (X2) derived from a monomer (x2) other than the macromonomer (x1). ) May be a copolymer containing.
• a structural unit (X1) derived from a macromonomer (x1) is used with respect to a main chain containing a structural unit (X2) derived from the monomer (x2).
• a copolymer having a side chain is preferable. More preferably, the copolymer contains a structural unit (X1) derived from the macromonomer (x1) as a main chain, as opposed to a main chain containing the structural unit (X2) derived from the monomer (x2). ..
• Examples of the monomer (x2) include a monomer (x2-a) represented by the following general formula (a1), an alkyl (meth) acrylate (x2-b), and a nitrogen atom-containing vinyl monomer (x2-c). ), Hydroxyl-containing vinyl monomer (x2-d), phosphorus atom-containing monomer (x2-e), aliphatic hydrocarbon-based vinyl monomer (x2-f), alicyclic hydrocarbon-based vinyl single amount Body (x2-g), vinyl esters (x2-h), vinyl ethers (x2-i), vinyl ketones (x2-j), epoxy group-containing vinyl monomer (x2-k), halogen element-containing vinyl monomer Monomer (x2-l), ester of unsaturated polycarboxylic acid (x2-m), (di) alkyl fumarate (x2-n), (di) alkyl maleate (x2-o), and aromatic hydrocarbon Examples thereof include a vinyl monomer (x2-p).
• the monomer (x2) is other than the nitrogen atom-containing vinyl monomer (x2-c), the phosphorus atom-containing monomer (x2-e), and the aromatic hydrocarbon-based vinyl monomer (x2-p). Monomer is preferred.
• the monomer (x2) includes a monomer (x2-a) represented by the following general formula (a1), an alkyl (meth) acrylate (x2-b), and a hydroxyl group-containing vinyl monomer (x2-d). ), And more preferably at least a hydroxyl group-containing vinyl monomer (x2-d).
• R b11 represents a hydrogen atom or a methyl group.
• R b12 represents a single bond, a linear or branched alkylene group having 1 to 10 carbon atoms, -O-, or -NH-.
• R b13 represents a linear or branched alkylene group having 2 to 4 carbon atoms.
• n represents an integer of 1 or more (preferably an integer of 1 to 20, more preferably an integer of 1 to 5). When n is an integer of 2 or more, the plurality of R b13s may be the same or different, and the (R b13 O) n portion may be a random bond or a block bond.
• R b14 represents a linear or branched alkyl group having 1 to 60 carbon atoms (preferably 10 to 50, more preferably 20 to 40).
• Specific examples of the "alkyl group” include the same groups as those exemplified in the above-mentioned general formulas (i) to (iii).
• alkyl (meth) acrylate (x2-b) examples include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and t.
• the alkyl group of the alkyl (meth) acrylate (x2-b) preferably has 4 to 30 carbon atoms, more preferably 4 to 24 carbon atoms, and even more preferably 4 to 18 carbon atoms.
• the alkyl group may be a straight chain alkyl group or a branched chain alkyl group.
• the content of the structural unit ( ⁇ ) derived from butyl (meth) acrylate is preferably 40 to 95 mol%, more preferably 50 to 90 mol% based on the total amount (100 mol%) of the structural unit of the comb polymer. , More preferably 60-85 mol%.
• the content of the structural unit ( ⁇ ) derived from the alkyl (meth) acrylate having an alkyl group having 12 to 20 carbon atoms is based on the total amount (100 mol%) of the structural units of the comb polymer, preferably 1 to 30 mol. %, More preferably 3 to 25 mol%, still more preferably 5 to 20 mol%.
• nitrogen atom-containing vinyl monomer (x2-c) examples include an amide group-containing vinyl monomer (x2-c1), a nitro group-containing monomer (x2-c2), and a primary amino group-containing vinyl monomer.
• Examples of the amide group-containing vinyl monomer (x2-c1) include (meth) acrylamide; N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, and Nn-.
• Monoalkylamino (meth) acrylamides such as butyl (meth) acrylamide and N-isobutyl (meth) acrylamide; N-methylaminoethyl (meth) acrylamide, N-ethylaminoethyl (meth) acrylamide, N-isopropylamino-n Monoalkylaminoalkyl (meth) acrylamides such as -butyl (meth) acrylamide, Nn-butylamino-n-butyl (meth) acrylamide, and N-isobutylamino-n-butyl (meth) acrylamide; N, N- Dialkylamino (meth) acrylamides such as dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N, N-diisopropyl (meth) acrylamide, and N, N-di-n-butyl (meth) acrylamide
• Dialkylaminoalkyl (meth) acrylamides such as N-vinylformamide, N-vinylacetamide, N-vinyl-n-propionylamide, N-vinylisopropionylamide, and N-vinylcarboxylic acid amides such as N-vinylhydroxyacetamide. ; Etc. can be mentioned.
• nitro group-containing monomer (x2-c2) examples include nitroethylene and 3-nitro-1-propene.
• Examples of the primary amino group-containing vinyl monomer (x2-c3) include alkenylamines having an alkenyl group having 3 to 6 carbon atoms such as (meth) allylamine and crotylamine; and having aminoethyl (meth) acrylate and the like. Aminoalkyl (meth) acrylates having 2 to 6 alkyl groups; and the like.
• Examples of the secondary amino group-containing vinyl monomer (x2-c4) include monoalkylaminoalkyl (meth) acrylates such as t-butylaminoethyl (meth) acrylate and methylaminoethyl (meth) acrylate; di (meth) acrylate. ) Dialkenylamine having 6 to 12 carbon atoms such as allylamine; and the like.
• Examples of the tertiary amino group-containing vinyl monomer (x2-c5) include dialkylaminoalkyl (meth) acrylates such as dimethylaminoethyl (meth) acrylate and diethylaminoethyl (meth) acrylate; morpholinoethyl (meth) acrylate and the like.
• nitrile group-containing vinyl monomer (x2-c6) examples include (meth) acrylonitrile.
• the content of the structural unit derived from the nitrogen atom-containing vinyl monomer (x2-c) is preferably as small as possible.
• the content of the structural unit derived from the specific nitrogen atom-containing vinyl monomer (x2-c) is preferably less than 1.0 mol% based on the total amount (100 mol%) of the structural unit of the comb-shaped polymer. It is more preferably less than 0.5 mol%, further preferably less than 0.1 mol%, even more preferably less than 0.01 mol%, and particularly preferably 0 mol%.
• hydroxyl group-containing vinyl monomer (x2-d) examples include a hydroxyl group-containing vinyl monomer (x2-d1) and a polyoxyalkylene chain-containing vinyl monomer (x2-d2).
• the hydroxyl group-containing vinyl monomer (x2-d1) has, for example, an alkyl group having 2 to 6 carbon atoms such as 2-hydroxyethyl (meth) acrylate and 2- or 3-hydroxypropyl (meth) acrylate.
• a compound in which an unsaturated group such as the above-mentioned polymerizable functional group possessed by the macromonomer (x1) is introduced; Examples thereof include a compound having an unsaturated group introduced therein.
• a hydroxyl group-containing vinyl monomer having two or more hydroxyl groups is preferable, and a compound in which the unsaturated group is introduced into a polyhydric alcohol or glyceric acid is more preferable.
• polyoxyalkylene chain-containing vinyl monomer (x2-d2) examples include polyoxyalkylene glycol (alkylene group having 2 to 4 carbon atoms and degree of polymerization of 2 to 50) and polyoxyalkylene polyol (the above-mentioned polyhydric alcohol).
• Polyoxyalkylene ether alkylene group having 2 to 4 carbon atoms, degree of polymerization of 2 to 100
• a compound selected from polyoxyalkylene glycol or an alkyl (carbon number 1 to 4) ether of a polyoxyalkylene polyol examples thereof include compounds into which the unsaturated group has been introduced.
• polyethylene glycol (Mn: 100 to 300) mono (meth) acrylate, polypropylene glycol (Mn: 130 to 500) mono (meth) acrylate, methoxypolyethylene glycol (Mn: 110 to 310) (meth) acrylate examples thereof include lauryl alcohol ethylene oxide adduct (2 to 30 mol) (meth) acrylate, and polyoxyethylene mono (meth) acrylate (Mn: 150 to 230) sorbitan.
• the content of the structural unit derived from the hydroxyl group-containing vinyl monomer (x2-d) is preferably 0.1 to 30 mol%, more preferably 0.1 to 30 mol%, based on the total amount (100 mol%) of the structural unit of the comb polymer. It is 0.5 to 20 mol%, more preferably 1 to 15 mol%, and even more preferably 3 to 10 mol%.
• Examples of the phosphorus atom-containing monomer (x2-e) include a phosphoric acid ester group-containing monomer (x2-e1) and a phosphono group-containing monomer (x2-e2).
• Examples of the phosphoric acid ester group-containing monomer (x2-e1) include (meth) acryloyloxyethyl phosphate and (meth) acryloyloxyisopropyl phosphate having an alkyl group having 2 to 4 carbon atoms (meth) acryloyloxy.
• Alkyl phosphate ester; vinyl phosphate, allyl phosphate, propenyl phosphate, isopropenyl phosphate, butenyl phosphate, pentenyl phosphate, octenyl phosphate, decenyl phosphate, dodecenyl phosphate, etc. having 2 to 12 carbon atoms.
• Phosphate alkenyl ester having an alkenyl group; and the like.
• Examples of the phosphono group-containing monomer (x2-e2) include (meth) acryloyloxyalkylphosphonic acid having an alkyl group having 2 to 4 carbon atoms such as (meth) acryloyloxyethyl phosphonic acid; vinylphosphonic acid and allyl. Examples thereof include phosphonic acid, alkenylphosphonic acid having an alkenyl group having 2 to 12 carbon atoms such as octenylphosphonic acid; and the like.
• the content of the structural unit derived from the phosphorus atom-containing monomer (x2-e) is preferably as small as possible.
• the content of the structural unit derived from the specific phosphorus atom-containing monomer (x2-e) is preferably less than 1.0 mol% based on the total amount (100 mol%) of the structural unit of the comb-shaped polymer. It is preferably less than 0.5 mol%, more preferably less than 0.1 mol%, even more preferably less than 0.01 mol%, and particularly preferably 0 mol%.
• aliphatic hydrocarbon vinyl monomer (x2-f) examples include alkenes having 2 to 20 carbon atoms such as ethylene, propylene, butene, isobutylene, pentene, heptene, diisobutylene, octene, dodecene, and octadecene; Alkenes having 4 to 12 carbon atoms such as butadiene, isoprene, 1,4-pentadiene, 1,6-heptadiene and 1,7-octadiene; and the like can be mentioned.
• the carbon number of the aliphatic hydrocarbon-based vinyl monomer (x2-f) is preferably 2 to 30, more preferably 2 to 20, and even more preferably 2 to 12.
• alpha-2-g alpha-2-(2-g)
• alicyclic hydrocarbon-based vinyl monomer (x2-g) examples include cyclohexene, (di) cyclopentadiene, pinene, limonene, vinylcyclohexene, and ethylidene bicycloheptene.
• the alicyclic hydrocarbon-based vinyl monomer (x2-g) preferably has 3 to 30, more preferably 3 to 20, and even more preferably 3 to 12.
• vinyl esters (x2-h) examples include vinyl esters of saturated fatty acids having 2 to 12 carbon atoms such as vinyl acetate, vinyl propionate, vinyl butyrate, and vinyl octanate.
• vinyl ethers (x2-i) examples include alkyl vinyl ethers having 1 to 12 carbon atoms such as methyl vinyl ether, ethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, and 2-ethylhexyl vinyl ether; vinyl-2-methoxyethyl ether, and vinyl.
• alkoxyalkyl vinyl ether having 1 to 12 carbon atoms such as -2-butoxyethyl ether; and the like can be mentioned.
• vinyl ketones (x2-j) examples include methyl vinyl ketone, alkyl vinyl ketone having 1 to 8 carbon atoms such as ethyl vinyl ketone; and the like.
• Epoxy group-containing vinyl monomer (x2-k) examples include glycidyl (meth) acrylate and glycidyl (meth) allyl ether.
• Halogen element-containing vinyl monomer (x2-l) examples include vinyl chloride, vinyl bromide, vinylidene chloride, and (meth) allyl chloride.
• Examples of the unsaturated polycarboxylic acid ester (x2-m) include an alkyl ester of an unsaturated polycarboxylic acid, a cycloalkyl ester of an unsaturated polycarboxylic acid, an aralkyl ester of an unsaturated polycarboxylic acid, and the like.
• Examples of the saturated carboxylic acid include maleic acid, fumaric acid, and itaconic acid.
• ((Di) Alkyl fumarate (x2-n)) examples include monomethyl fumarate, dimethyl fumarate, monoethyl fumarate, diethyl fumarate, methyl ethyl fumarate, monobutyl fumarate, dibutyl fumarate, and dipentyl fumarate. , And dihexyl fumarate and the like.
• ((Di) Alkyl maleate (x2-o)) examples include monomethyl maleate, dimethyl maleate, monoethyl maleate, diethyl maleate, methyl ethyl maleate, monobutyl maleate, and dibutyl maleate. Be done.
• Aromaatic hydrocarbon-based vinyl monomer (x2-p) examples include styrene, ⁇ -methylstyrene, ⁇ -ethylstyrene, vinyltoluene, 2,4-dimethylstyrene, 4-ethylstyrene, and 4-isopropylstyrene.
• the content of the structural unit derived from the aromatic hydrocarbon-based vinyl monomer (x2-p) is preferably as small as possible.
• the content of the structural unit derived from the specific aromatic hydrocarbon-based vinyl monomer (x2-p) is preferably 1.0 mol% based on the total amount (100 mol%) of the structural unit of the comb-shaped polymer. Less than, more preferably less than 0.5 mol%, even more preferably less than 0.1 mol%, even more preferably less than 0.01 mol%, particularly preferably 0 mol%.
• the lubricating oil composition of the present invention contains the resin content (B1) derived from the viscosity index improver (B) and the first olefin polymer (A1-1) [(B1) / (A1-1)]. However, the mass ratio is more than 0.001. [(B1) / (A1-1)] means the amount of the resin content (B1) derived from the viscosity index improver (B) with respect to the first olefin polymer (A1-1), and this value is 0. When it is 001 or less, the lubricating oil composition is inferior in oil film retention.
• [(B1) / (A1-1)] is preferably 0.002 from the viewpoint of facilitating the preparation of a lubricating oil composition having excellent oil film retention.
• it is more preferably 0.003 or more, further preferably 0.004 or more, still more preferably 0.005 or more.
• it is preferably 0.10 or less, more preferably 0.05 or less, and further preferably 0.02 or less.
• the upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 0.002 to 0.10, more preferably 0.003 to 0.05, still more preferably 0.004 to 0.02, and even more preferably 0.005 to 0.02. ..
• the lubricating oil composition of the present invention contains an imide-based dispersant (C).
• the lubricating oil composition of the present invention has a nitrogen atom content derived from the imide-based dispersant (C) of 0.06% by mass or more based on the total amount of the lubricating oil composition. If the nitrogen atom content derived from the imide-based dispersant (C) is less than 0.06% by mass, the high-temperature cleanliness of the lubricating oil composition cannot be ensured. Moreover, the oil film retention cannot be made sufficient.
• the lubricating oil composition of one aspect of the present invention preferably has a nitrogen atom content derived from the imide-based dispersant (C) of 0.08 mass from the viewpoint of improving high-temperature cleanliness and oil film retention.
• C imide-based dispersant
• % Or more more preferably 0.10% by mass or more, still more preferably 0.11% by mass or more.
• it is preferably 1.00% by mass or less, more preferably 0.50% by mass or less, and further preferably 0.20% by mass or less.
• the upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 0.08% by mass to 1.00% by mass, more preferably 0.10% by mass to 0.50% by mass, and further preferably 0.11% by mass to 0.20% by mass. ..
• the content of the imide-based dispersant (C) is adjusted so that the nitrogen atom content derived from the imide-based dispersant (C) satisfies the above range.
• the content of the imide-based dispersant (C) is preferably 1.0% by mass or more, more preferably 5.0% by mass or more, still more preferably 7.5% by mass or more, based on the total amount of the lubricating oil composition. be. Further, it is preferably 20.0% by mass or less, more preferably 15.0% by mass or less, still more preferably 12.5% by mass or less.
• the upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 1.0% by mass to 20.0% by mass, more preferably 5.0% by mass to 15.0% by mass, and further preferably 7.5% by mass to 12.5% by mass. ..
• Examples of the imide-based dispersant (C) include monoimide succinates such as monoimide alkenylsuccinate and monoimide alkylsuccinate; boron-modified compounds of monoimide succinate; bisimide succinates such as bisimide alkenylsuccinate and bisimide alkylsuccinate; Included is one or more compounds selected from the group consisting of modified boron succinate bisimides. Among these, one or more selected from the group consisting of monoimide succinate (non-boron modified product) and bisimide succinate (non-boron modified product) is preferable. As the imide-based dispersant (C), one type may be used alone, or two or more types may be used in combination.
• alkenyl succinate monoimide or alkyl succinate monoimide examples include compounds represented by the following general formula (c-1).
• Examples of the bisimide alkenyl succinate or the bisimide alkyl succinate include compounds represented by the following general formula (c-2).
• R 3C , R 5C , and R 6C are alkenyl groups or alkyl groups, and the mass average molecular weight (Mw) is preferably 500 to 3, respectively. It is 000, more preferably 1,000 to 3,000.
• Mw mass average molecular weight
• the mass average molecular weights of R 3C , R 5C , and R 6C are 500 or more, the solubility in the base oil (A) can be improved. Further, when it is 3,000 or less, the effect of the present invention can be more easily exhibited.
• R 5C and R 6C may be the same or different.
• R 4C , R 7C , and R 8C are alkylene groups having 2 to 5 carbon atoms, respectively, and R 7C and R 8C may be the same or different.
• n1 indicates an integer of 1 to 10
• n2 indicates an integer of 0 or 1 to 10.
• n1 is preferably 2 to 5, more preferably 2 to 4.
• n1 is 2 or more, the effect of the present invention can be more easily exerted.
• n1 is 5 or less, the solubility in the base oil (A) becomes even better.
• n2 is preferably 1 to 6, and more preferably 2 to 6.
• n2 is 1 or more, the effect of the present invention can be more easily exerted.
• n2 is 6 or less, the solubility in the base oil (A) becomes even better.
• Examples of the alkenyl group that can be selected as R 3C , R 5C , and R 6C include a polybutenyl group, a polyisobutenyl group, and an ethylene-propylene copolymer, and preferably a polybutenyl group or a polyisobutenyl group. ..
• As the polybutenyl group a mixture of 1-butene and isobutene or a polymer of high-purity isobutene is preferably used.
• Examples of the alkyl group that can be selected as R 3C , R 5C , and R 6C include those hydrogenated with a polybutenyl group, a polyisobutenyl group, an ethylene-propylene copolymer, and the like, and a polybutenyl group or a polyisobutenyl is preferable. Examples include hydrogenated groups.
• the above-mentioned alkenyl succinimide or alkyl succinimide is usually obtained by reacting a polyolefin with maleic anhydride to obtain an alkenyl succinimide, or hydrogenating the alkenyl succinimide to obtain a polyamine. It can be produced by reacting. Monoimide or bisimide can be produced by changing the ratio of alkenyl succinic anhydride or alkyl succinic anhydride to polyamine.
• the above-mentioned alkenyl succinimide or alkyl succinimide succinimide may be a boron-modified product.
• the boron-modified product can be produced, for example, by reacting a boron-free monoimide alkenyl succinate or monoimide alkyl succinate, or bisimide alkenyl succinate or bisimide alkyl succinate with a boron compound.
• polyolefin monomer forming the polyolefin for example, one or more selected from ⁇ -olefins having 2 to 8 carbon atoms can be used, and a mixture of isobutene and 1-butene can be preferably used. ..
• polyamines include single diamines such as ethylenediamine, propylenediamine, butylenediamine, and pentylenediamine; diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, di (methylethylene) triamine, dibutylenetriamine, and triamine.
• Polyalkylene polyamines such as butylenetetramine and pentapentylenehexamine; piperazine derivatives such as aminoethylpiperazine and the like can be mentioned.
• One type of polyamine may be used alone, or two or more types may be used in combination.
• Examples of the boron compound include boric acid, borate, boric acid ester and the like.
• Examples of boric acid include orthoboric acid, metaboric acid, paraboric acid and the like.
• Examples of the borate include ammonium borate such as ammonium metaborate, ammonium tetraborate, ammonium pentaborate and ammonium octaborate.
• Examples of borate esters include monomethyl borate, dimethyl borate, trimethyl borate, monoethyl borate, diethyl borate, triethyl borate, monopropyl borate, dipropyl borate, tripropyl borate, monobutyl borate, and boric acid. Examples thereof include dibutyl and tributyl borate.
• the lubricating oil composition of one aspect of the present invention may contain a metal-based cleaning agent (D).
• the metal-based cleaning agent (D) When the lubricating oil composition of one aspect of the present invention contains the metal-based cleaning agent (D), the high-temperature cleaning property of the lubricating oil composition can be further improved.
• the content of the metal atom derived from the metal-based cleaning agent (D) is from the viewpoint of improving the high-temperature cleaning property and from the viewpoint of suppressing the sulfated ash content to a low level.
• the content of the metal-based cleaning agent (D) is adjusted so that the content of the metal atom derived from the metal-based cleaning agent (D) satisfies the above range. do it.
• the content of the metal-based cleaning agent (D) is preferably 0.1% by mass to 10.0% by mass, more preferably 0.5% by mass to 5.0% by mass, based on the total amount of the lubricating oil composition. More preferably, it is 0.75% by mass to 2.0% by mass.
• the metal-based cleaning agent (D) examples include an alkali metal-based cleaning agent and an alkaline earth metal-based cleaning agent, and among these, an alkaline earth metal-based cleaning agent is preferable.
• the alkaline earth metal constituting the alkaline earth metal-based cleaning agent include magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba).
• magnesium (Mg) magnesium (Mg)
• Ca calcium
• Ba barium
• calcium (Ca) Magnesium (Mg) is preferable.
• the metal-based cleaning agent (D) is preferably one or more selected from the group consisting of the calcium-based cleaning agent (D1) and the magnesium-based cleaning agent (D2).
• the calcium-based cleaning agent (D1) and the magnesium-based cleaning agent (D2) will be described in detail.
• Examples of the calcium-based cleaning agent (D1) include calcium salts such as calcium sulfonate, calcium phenate, and calcium salicylate. Among these, calcium phenate and calcium salicylate are preferable, and calcium salicylate is more preferable, from the viewpoint of improving high-temperature cleanliness.
• the calcium sulfonate in the metal sulfonate represented by the following general formula (d1-1), a compound in which M is a calcium atom is preferable.
• As the calcium phenate in the metal phenate represented by the following general formula (d1-2), a compound in which M'is a calcium atom is preferable.
• the calcium salicylate in the metal salicylate represented by the following general formula (d1-3), a compound in which M is a calcium atom is preferable.
• the calcium-based cleaning agent (D1) one type may be used alone, or two or more types may be used in combination.
• M is a metal atom selected from an alkali metal and an alkaline earth metal, and M'is an alkaline earth metal.
• p is the valence of M, which is 1 or 2.
• R is a hydrogen atom or a hydrocarbon group having 1 to 18 carbon atoms.
• q is an integer of 0 or more, preferably an integer of 0 to 3.
• the hydrocarbon group that can be selected as R include an alkyl group having 1 to 18 carbon atoms, an alkenyl group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 18 ring-forming carbon atoms, and 6 to 18 ring-forming carbon atoms.
• Examples thereof include an aryl group of 7 to 18, an alkylaryl group having 7 to 18 carbon atoms, and an arylalkyl group having 7 to 18 carbon atoms.
• the calcium-based cleaning agent (D1) may be neutral, basic, or hyperbasic, but from the viewpoint of facilitating the improvement of base value maintenance, basic or hyperbasic ones are used. It is preferable, and a hyperbasic one is more preferable.
• the basic or hyperbasic metal-based cleaning agent is a stoichiometric amount required for neutralizing the metal and the acidic organic compound by reacting the metal with the acidic organic compound. Means one containing an excess of metal. That is, the total chemical equivalent of the metal in the metal-based cleaning agent with respect to the chemical equivalent of the metal in the metal salt (neutral salt) obtained by reacting the metal according to the stoichiometric amount required for neutralization of the acidic organic compound.
• the metal ratio of the basic or hyperbasic metal-based cleaning agent is larger than 1.
• the metal ratio of the basic or hyperbasic metal-based cleaning agent used in the present embodiment is preferably more than 1.3, more preferably 5 to 30, and even more preferably 7 to 22.
• Specific examples of the basic or hyperbasic metal-based cleaning agent include those containing one or more selected from the group consisting of the above-mentioned metal salicylate, metal phenate and metal sulfonate, and containing an excess of metal. ..
• those having a base value of less than 50 mgKOH / g measured by the measurement method described later are “neutral”, those having a base value of 50 mgKOH / g or more and less than 150 mgKOH / g are “basic”, 150 mgKOH / g. The above is defined as “hyperbasic”.
• the base value of the calcium-based cleaning agent (D1) is preferably 5 mgKOH / g or more, more preferably 100 mgKOH / g or more, still more preferably 150 mgKOH / g or more, still more preferably 200 mgKOH / g or more, and preferably. It is 500 mgKOH / g or less, more preferably 450 mgKOH / g or less, still more preferably 400 mgKOH / g or less.
• the "base value" of the metal-based cleaning agent (D) means the base value measured by the perchloric acid method in accordance with JIS K 2501: 2003.
• the content of the calcium atom derived from the calcium-based cleaning agent (D1) is from the viewpoint of improving the high-temperature cleaning property and from the viewpoint of suppressing the sulfated ash content to a low level. Based on the total amount of the lubricating oil composition, preferably 0.01% by mass to 0.75% by mass, more preferably 0.02% by mass to 0.30% by mass, and further preferably 0.05% by mass to 0. It is 15% by mass. Further, in the lubricating oil composition of one aspect of the present invention, the content of the calcium-based cleaning agent (D1) is adjusted so that the content of calcium atoms derived from the calcium-based cleaning agent (D1) satisfies the above range.
• the content of the calcium-based cleaning agent (D1) is preferably 0.01% by mass to 10.0% by mass, more preferably 0.10% by mass to 5.0% by mass, based on the total amount of the lubricating oil composition. More preferably, it is 0.80% by mass to 2.00% by mass.
• magnesium-based cleaning agent (D2) examples include magnesium salts such as magnesium sulfonate, magnesium phenate, and magnesium salicylate. Among these, magnesium sulfonate is preferable from the viewpoint of improving high-temperature cleanliness.
• magnesium sulfonate in the metal sulfonate represented by the above general formula (d1-1), a compound in which M is a magnesium atom is preferable.
• magnesium phenate in the metal phenate represented by the above general formula (d1-2), a compound in which M'is a magnesium atom is preferable.
• magnesium salicylate a compound in which M is a magnesium atom in the metal salicylate represented by the above general formula (d1-3) is preferable.
• M is a magnesium atom in the metal salicylate represented by the above general formula (d1-3)
• the magnesium-based cleaning agent (D2) one type may be used alone, or two or more types may be used in combination.
• the magnesium-based cleaning agent (D2) may be either neutral, basic or hyperbasic, but from the viewpoint of cleanliness, a basic or superbasic one is preferable.
• the base value of the magnesium-based cleaning agent (D2) is preferably 5 mgKOH / g or more, more preferably 100 mgKOH / g or more, still more preferably 150 mgKOH / g or more, still more preferably 200 mgKOH / g or more, and preferably. It is 500 mgKOH / g or less, more preferably 450 mgKOH / g or less, still more preferably 400 mgKOH / g or less.
• the content of the magnesium atom derived from the magnesium-based cleaning agent (D2) is from the viewpoint of improving the high-temperature cleaning property and from the viewpoint of suppressing the sulfated ash content to a low level. Based on the total amount of the lubricating oil composition, preferably 0.001% by mass to 0.1% by mass, more preferably 0.010% by mass to 0.050% by mass, and further preferably 0.015% by mass to 0. It is 025% by mass. Further, in the lubricating oil composition of one aspect of the present invention, the content of the magnesium-based cleaning agent (D2) is adjusted so that the content of magnesium atoms derived from the magnesium-based cleaning agent (D2) satisfies the above range.
• the content of the magnesium-based cleaning agent (D2) is preferably 0.001% by mass to 2.000% by mass, more preferably 0.005% by mass to 1.000% by mass, based on the total amount of the lubricating oil composition. More preferably, it is 0.01% by mass to 0.300% by mass.
• the lubricating oil composition of one aspect of the present invention may contain zinc dithiophosphate (E).
• the lubricating oil composition of one aspect of the present invention contains zinc dithiophosphate (E)
• the abrasion resistance of the lubricating oil composition can be further improved.
• the zinc dithiophosphate (E) used in the lubricating oil composition of one aspect of the present invention is preferably represented by the following general formula (e-1).
• R 21E to R 24E each independently represent a hydrocarbon group.
• the hydrocarbon group is not particularly limited as long as it is a monovalent hydrocarbon group.
• an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group and the like are preferably mentioned from the viewpoint of improving oxidative stability.
• a group and an aryl group are more preferable, and an alkyl group is further preferable. That is, as the zinc dithiophosphate used in one aspect of the present invention, zinc dialkyldithiophosphate is preferable.
• the alkyl group and alkenyl group that can be selected as R 21E to R 24E may be linear or branched, but are primary or secondary from the viewpoint of obtaining better oxidative stability. Is preferable, and among them, a primary alkyl group and a secondary alkyl group are preferable. That is, as the zinc dialkyl dithiophosphate, primary zinc dialkyl dithiophosphate and zinc secondary dialkyl dithiophosphate are preferable.
• the number of carbon atoms of the hydrocarbon groups that can be selected as R 21E to R 24E is preferably 1 or more, more preferably 2 or more, still more preferably 3 or more when the monovalent hydrocarbon group is an alkyl group.
• the upper limit is preferably 24 or less, more preferably 18 or less, still more preferably 12 or less.
• the monovalent hydrocarbon is an alkenyl group, it is preferably 2 or more, more preferably 3 or more, and the upper limit is preferably 24 or less, more preferably 18 or less, still more preferably 12 or less.
• the cycloalkyl group and aryl group that can be selected as R 21E to R 24E may be a polycyclic group such as a decalyl group or a naphthyl group.
• the carbon number of the hydrocarbon group that can be selected as R 21E to R 24E when the monovalent hydrocarbon is a cycloalkyl group, the carbon number is preferably 5 or more, and the upper limit is preferably 20 or less.
• the monovalent hydrocarbon is an aryl group, the number of carbon atoms is preferably 6 or more, and the upper limit is preferably 20 or less.
• the monovalent hydrocarbon group may be partially substituted with a group containing an oxygen atom and / or a nitrogen atom such as a hydroxyl group, a carboxy group, an amino group, an amide group, a nitro group and a cyano group, and the nitrogen atom may be partially substituted.
• a group containing an oxygen atom and / or a nitrogen atom such as a hydroxyl group, a carboxy group, an amino group, an amide group, a nitro group and a cyano group, and the nitrogen atom may be partially substituted.
• Oxygen atom, halogen atom or the like may be partially substituted, and when the monovalent hydrocarbon group is a cycloalkyl group or an aryl group, it further has a substituent such as an alkyl group or an alkenyl group. May be.
• the lubricating oil composition according to one aspect of the present invention is provided in an exhaust gas purification device from the viewpoint of making it easier to improve the wear resistance of the lubricating oil composition and suppressing the amount of phosphorus in the lubricating oil composition.
• the content of the phosphorus atom derived from zinc dithiophosphate (E) is preferably 0.005% by mass to 0.200% by mass based on the total amount of the lubricating oil composition. It is preferably 0.010% by mass to 0.150% by mass, and more preferably 0.05% by mass to 0.100% by mass.
• the content of zinc atom derived from zinc dithiophosphate (E) is preferably 0.005% by mass to 0.200% by mass, more preferably 0. It is 010% by mass to 0.150% by mass, more preferably 0.06% by mass to 0.110% by mass. Further, in the lubricating oil composition of one aspect of the present invention, the content of zinc dithiophosphate (E) is such that the phosphorus atom content and the zinc atom content derived from zinc dithiophosphate (E) satisfy the above ranges. It should be adjusted to.
• the content of zinc dithiophosphate (E) is preferably 0.10% by mass to 5.00% by mass, more preferably 0.50% by mass to 2.50% by mass, and further, based on the total amount of the lubricating oil composition. It is preferably 0.75% by mass to 1.25% by mass.
• the lubricating oil composition according to one aspect of the present invention is, if necessary, an additive for lubricating oil other than the above-mentioned components (hereinafter, also simply referred to as "additive for lubricating oil") as long as the effect of the present invention is not impaired. ) May be contained.
• the additive for lubricating oil include antioxidants, extreme pressure agents, friction modifiers, defoamers, rust inhibitors, corrosion inhibitors, metal inactivating agents and the like.
• an abrasion resistant agent other than zinc dithiophosphate (E) can be mentioned.
• one type may be used alone, or two or more types may be used in combination.
• each of these additives for lubricating oil can be appropriately adjusted within a range that does not impair the effects of the present invention, but is usually 0.001% by mass or more based on the total amount of the lubricating oil composition. It is preferably 0.005% by mass or more, more preferably 0.01% by mass or more, and preferably 30% by mass or less, more preferably 27% by mass or less, still more preferably 24% by mass or less.
• the total content of these additives for lubricating oil is preferably 5% by mass or more, more preferably 10 based on the total amount (100% by mass) of the lubricating oil composition. It is mass% or more, more preferably 15% by mass or more, and preferably 35% by mass or less, preferably 30% by mass or less, more preferably 27% by mass or less, still more preferably 25% by mass or less.
• antioxidant any known antioxidant that has been conventionally used as an antioxidant for lubricating oils can be appropriately selected and used.
• amine-based antioxidants and phenol-based antioxidants can be used.
• examples include antioxidants.
• One type of antioxidant may be used alone, or two or more types may be used in combination.
• Extreme pressure agent examples include sulfur-based extreme pressure agents such as sulfides, sulfoxides, sulfones, and thiophosphinates, halogen-based extreme pressure agents such as chlorinated hydrocarbons, and organic metal-based extreme pressure agents. Be done.
• the extreme pressure agent may be used alone or in combination of two or more.
• ⁇ Friction modifier for example, there is no aliphatic amine, fatty acid ester, fatty acid amide, fatty acid, aliphatic alcohol, aliphatic ether or the like having at least one alkyl group or alkenyl group having 6 to 30 carbon atoms in the molecule.
• Examples thereof include ash friction modifiers; fats and oils; amines; amides; sulfurized esters; phosphoric acid esters; phosphite esters; phosphoric acid ester amine salts and the like.
• One type of friction modifier may be used alone, or two or more types may be used in combination.
• defoaming agent examples include silicone oil, fluorosilicone oil, fluoroalkyl ether and the like.
• the defoaming agent one type may be used alone, or two or more types may be used in combination.
• rust preventive agent examples include fatty acids, alkenyl succinic acid half esters, fatty acid sicken, alkyl sulfonates, polyhydric alcohol fatty acid esters, fatty acid amines, oxidized paraffins, alkyl polyoxyethylene ethers and the like.
• fatty acids alkenyl succinic acid half esters, fatty acid sicken, alkyl sulfonates, polyhydric alcohol fatty acid esters, fatty acid amines, oxidized paraffins, alkyl polyoxyethylene ethers and the like.
• the rust preventive agent one type may be used alone, or two or more types may be used in combination.
• corrosion inhibitor examples include benzotriazole-based compounds, tolyltriazole-based compounds, thiadiazol-based compounds, imidazole-based compounds, pyrimidine-based compounds and the like. These may be used individually by 1 type, and may be used in combination of 2 or more type.
• the abrasion resistant agent include zinc phosphate other than zinc dithiophosphate (E), zinc dithiocarbamate, disulfides, olefin sulfides, oils and fats sulfides, sulfide esters, thiocarbonates, thiocarbamates, polysulfides and the like.
• Sulfur-containing compounds Phosphoric acid esters, phosphoric acid esters, phosphonic acid esters, phosphorus-containing compounds such as their amine salts or metal salts; , Sulfur and phosphorus-containing abrasion resistant agents such as these amine salts or metal salts. These may be used individually by 1 type, and may be used in combination of 2 or more type.
• the lubricating oil composition of one aspect of the present invention may contain a molybdenum-based compound, but the content of the molybdenum-based compound is preferably small.
• the lubricating oil composition of one aspect of the present invention is excellent in abrasion resistance even if it does not contain a molybdenum-based compound. Therefore, excellent effects can be exhibited without adding a molybdenum-based compound that causes a decrease in high-temperature cleanliness.
• the content of Mo atoms derived from the molybdenum-based compound is preferably less than 0.10% by mass, more preferably less than 0.05% by mass, still more preferably less than 0.04% by mass, based on the total amount of the lubricating oil composition. Even more preferably, it does not contain a molybdenum-based compound.
• molybdenum-based compounds include binuclear organic molybdenum compounds such as dinuclear molybdenum dithiocarbamate; and trinuclear organic molybdenum compounds.
• the lubricating oil composition of one aspect of the present invention may contain an anti-mist agent, but the content of the anti-mist agent is preferably small.
• the content of the mist inhibitor is preferably less than 0.01% by mass, more preferably less than 0.001% by mass, and even more preferably no mist inhibitor, based on the total amount of the lubricating oil composition.
• a hydrocarbon-based polymer compound such as polyisobutylene or an ethylene-propylene copolymer can be used.
• the number average molecular weight of the polymer compound is preferably 100,000 to 3 million, more preferably 200,000 to 2 million.
• the lubricating oil composition of the present invention has a 100 ° C. kinematic viscosity of 5.0 mm 2 / s or more and less than 7.1 mm 2 / s.
• 100 ° C. kinematic viscosity is less than 5.0 mm 2 / s, it becomes difficult to hold the oil film and the amount of NOACK evaporation tends to increase.
• the 100 ° C. kinematic viscosity is 7.1 mm 2 / s or more, the fuel saving property is lowered.
• one embodiment lubricating oil compositions of the present invention 100 ° C. kinematic viscosity is preferably 5.1 mm 2 / s or more, more preferably 5.2 mm 2 / s or more, more preferably 5.3 mm 2 / S or more. Further, it is preferably 6.8 mm 2 / s or less, more preferably 6.6 mm 2 / s or less, and further preferably 6.4 mm 2 / s or less. The upper and lower limits of these numerical ranges can be arbitrarily combined.
• the kinematic viscosity of the lubricating oil composition at 100 ° C. is a value measured in accordance with JIS K2283: 2000.
• the lubricating oil composition according to one aspect of the present invention preferably has an HTHS viscosity at 150 ° C. of 2.0 mPa ⁇ s or more and less than 2.3 mPa ⁇ s.
• the HTHS viscosity at 150 ° C. is 2.0 mPa ⁇ s or more, the oil film can be easily held. Further, when the HTHS viscosity at 150 ° C. is less than 2.3 mPa ⁇ s, it is easy to improve the fuel efficiency.
• the lubricating oil composition of one aspect of the present invention has a HTHS viscosity at 150 ° C., more preferably 2.0 mPa ⁇ s or more and 2.2 mPa ⁇ s or less.
• HTHS viscosity at 0.99 ° C. conforms to ASTM D4683, using TBS hot viscometer (Tapered Bearing Simulator Viscometer), a temperature of 0.99 ° C., measured at a shear rate of 10 6 / s Is the value to be.
• One aspect lubricating oil composition of the present invention preferably has a 40 ° C. kinematic viscosity of 15.0mm 2 /s ⁇ 30.0mm 2 / s.
• the 40 ° C. kinematic viscosity is 15.0 mm 2 / s or more, it becomes easy to hold the oil film and it becomes easy to suppress the NOACK evaporation amount.
• the 40 ° C. kinematic viscosity is 30 mm 2 / s or less, it is easy to improve fuel efficiency. From this point of view, one embodiment lubricating oil compositions of the present invention, is 40 ° C.
• the 40 ° C. kinematic viscosity of the lubricating oil composition is a value measured in accordance with JIS K2283: 2000.
• the lubricating oil composition of one aspect of the present invention has a viscosity index of preferably 150 or more, more preferably 160 or more, still more preferably 170 or more. Further, it is preferably 230 or less, more preferably 220 or less, and further preferably 210 or less. The upper and lower limits of these numerical ranges can be arbitrarily combined. Specifically, it is preferably 150 to 230, more preferably 160 to 220, and even more preferably 170 to 210. In this specification, the viscosity index of the lubricating oil composition is a value calculated in accordance with JIS K2283: 2000.
• the lubricating oil composition according to one aspect of the present invention has a NOACK evaporation amount (250 ° C., 1 hour) of less than 23% by mass.
• NOACK evaporation amount 250 ° C., 1 hour
• the lubricating oil composition is thickened, which causes a decrease in fuel consumption.
• the lubricating oil composition of one aspect of the present invention has a NOACK evaporation amount of preferably 22% by mass or less, more preferably 21% by mass or less, still more preferably 20% by mass or less. Further, it is usually 0.1% by mass or more.
• the NOACK evaporation amount is a value measured according to JPI-5S-41-2004 under the conditions of 250 ° C. and 1 hour.
• the lubricating oil composition of the present invention has an aniline point of 95 ° C. or higher. If the aniline point of the lubricating oil composition is less than 95 ° C., the rubber material may be swollen or hardened.
• the aniline point is preferably 100 ° C. or higher, more preferably 110 ° C. or higher, from the viewpoint of further improving the compatibility with the rubber material without swelling or hardening the rubber material.
• the aniline point is a value measured in accordance with JIS K 2256: 2013.
• the lubricating oil composition of the present invention is excellent in high temperature cleanliness.
• the score of the hot tube test carried out by the method described in Examples described later is preferably 2.5 or more.
• the lubricating oil composition of the present invention is excellent in oil film retention.
• the oil film thickness carried out by the method described in Examples described later is preferably 60 nm or more.
• the lubricating oil composition according to one aspect of the present invention has a molybdenum (Mo) atom content of preferably less than 0.10% by mass, more preferably less than 0.05% by mass, based on the total amount of the lubricating oil composition. It is more preferably less than 0.04% by mass, even more preferably less than 0.02% by mass, and particularly preferably free of molybdenum (Mo) atoms.
• the content of molybdenum atoms can be measured in accordance with JIS-5S-38-03.
• the method for producing the lubricating oil composition of the present invention is not particularly limited.
• the method for producing a lubricating oil composition according to one aspect of the present invention includes a base oil (A) containing an olefin polymer (A1), a viscosity index improver (B), and an imide dispersant (C).
• the olefin polymer (A1) contains a first olefin polymer (A1-1) having a kinematic viscosity of 3.0 mm 2 / s or more at 100 ° C., and the first olefin polymer (A1-1).
• the olefin-based polymer (A1) does not contain the second olefin-based polymer (A1-2) having a kinematic viscosity of less than 3.0 mm 2 / s at 100 ° C., or even if it contains the base oil (based oil). It is less than 18.5% by mass based on the total amount of A).
• the content of the resin content (B1) derived from the viscosity index improver (B) is 0.01% by mass or more based on the total amount of the lubricating oil composition.
• the nitrogen atom content derived from the imide-based dispersant (C) is 0.06% by mass or more based on the total amount of the lubricating oil composition.
• the content ratio [(B1) / (A1-1)] of the resin component (B1) derived from the viscosity index improver (B) and the first olefin polymer (A1-1) is a mass ratio. It is over 0.001
• the kinematic viscosity at 100 ° C. is 5.0 mm 2 / s or more and less than 7.1 mm 2 / s. This is a method for producing a lubricating oil composition having an aniline point of 95 ° C. or higher.
• the method for mixing each of the above components is not particularly limited, but for example, the viscosity index improver (B) and the imide-based dispersant (C) are added to the base oil (A) containing the olefin polymer (A1).
• examples thereof include a method having a step of blending.
• the viscosity index improver (B) and the imide-based dispersant (C) may be simultaneously blended with the base oil (A) containing the olefin-based polymer (A1), or may be blended separately.
• each component may be blended after adding a diluting oil or the like to form a solution (dispersion). After blending each component, it is preferable to stir and uniformly disperse by a known method.
• the lubricating oil composition according to one aspect of the present invention is preferably used as a lubricating oil composition for an automobile such as a two-wheeled vehicle or a four-wheeled vehicle, a generator, a gasoline engine such as a ship, a diesel engine, or an internal combustion engine such as a gas engine.
• it can be preferably used as a lubricating oil composition used in an environment with a high heat load such as an internal combustion engine such as an engine equipped with a supercharger such as a turbocharger.
• the lubricating oil composition of one aspect of the present invention fills these internal combustion engines, particularly an internal combustion engine equipped with a supercharger (engine equipped with a supercharger), and lubricates each component related to these internal combustion engines. It is preferably used for this purpose. Therefore, according to one aspect of the present invention, there is provided a method of lubricating an internal combustion engine by using the lubricating oil composition. Further, a method for lubricating an internal combustion engine (supercharger-mounted engine) equipped with a supercharger by using the lubricating oil composition is provided.
• a lubricating oil composition containing a base oil (A) containing an olefin polymer (A1), a viscosity index improver (B), and an imide dispersant (C).
• the olefin polymer (A1) contains a first olefin polymer (A1-1) having a kinematic viscosity of 3.0 mm 2 / s or more at 100 ° C., and the first olefin polymer (A1-1). ) Is 30% by mass or more based on the total amount of the base oil (A).
• the olefin-based polymer (A1) does not contain the second olefin-based polymer (A1-2) having a kinematic viscosity of less than 3.0 mm 2 / s at 100 ° C., or even if it contains the base oil (based oil). It is less than 18.5% by mass based on the total amount of A).
• the content of the resin content (B1) derived from the viscosity index improver (B) is 0.01% by mass or more based on the total amount of the lubricating oil composition.
• the nitrogen atom content derived from the imide-based dispersant (C) is 0.06% by mass or more based on the total amount of the lubricating oil composition.
• the content ratio [(B1) / (A1-1)] of the resin component (B1) derived from the viscosity index improver (B) and the first olefin polymer (A1-1) is a mass ratio. It is over 0.001
• the kinematic viscosity at 100 ° C. is 5.0 mm 2 / s or more and less than 7.1 mm 2 / s.
• the base oil (A) is a synthetic oil (A3) other than the mineral oil (A2) and the first olefin polymer (A1-1) and the second olefin polymer (A1-2).
• HTHS viscosity high temperature and high shear viscosity
• Mass average molecular weight (Mw), number average molecular weight (Mn) It was measured under the following conditions using a gel permeation chromatograph device (manufactured by Agilent, "1260 type HPLC"), and the value measured in terms of standard polystyrene was used.
• Measurement condition -Column: Two "Shodex LF404" are connected in sequence.
• Development solvent Chloroform-Flow velocity: 0.3 mL / min
• Examples 1 to 4 and Comparative Examples 1 to 6 The following base oil (A), viscosity index improver (B), imide-based dispersant (C), and various additives are sufficiently mixed in the blending amounts (unit: mass%) shown in Table 1 and carried out.
• Lubricating oil compositions of Examples 1 to 4 and Comparative Examples 1 to 6 were prepared, respectively. Details of the base oil (A), viscosity index improver (B), imide-based dispersant (C), and various additives used in the preparation of the lubricating oil compositions of Examples 1 to 4 and Comparative Examples 1 to 6 are as follows. , As shown below.
• the blending amount of the viscosity index improver (B) shown in Table 1 is the blending amount of the active ingredient (resin content (B1)) excluding the diluted oil.
• ⁇ Base oil (A)> (First olefin polymer (A1-1) -1) Olefin polymer produced in Production Example 1 described later 40 ° C. kinematic viscosity: 13.61 mm 2 / s, 100 ° C. kinematic viscosity: 3.42 mm 2 / s, viscosity index 129 (First olefin polymer (A1-1) -2) Made by Ineos, product name "Durasin 133" 40 ° C. kinematic viscosity: 13.41 mm 2 / s, 100 ° C.
• kinematic viscosity 3.36 mm 2 / s, viscosity index: 125 (Second olefin polymer (A1-2) -1) Made by Ineos, product name "Durasin 162" 40 ° C.
• kinematic viscosity 5.10mm 2 / s, 100 °C kinematic viscosity: 1.80 mm 2 / s (Second olefin polymer (A1-2) -2)
• Poly ⁇ -olefin oligomer obtained by synthesizing 1-decene, which is a raw material monomer, using a BF 3 catalyst. 40 ° C.
• kinematic viscosity 5 mm 2 / s, 100 ° C. kinematic viscosity: 1.7 mm 2 / s (Mineral oil (A2) -1) Mineral oils classified into Group III in the API category 40 ° C kinematic viscosity: 19 mm 2 / s, 100 ° C kinematic viscosity: 4.2 mm 2 / s, viscosity index: 126 (Mineral oil (A2) -2) Mineral oils classified into Group II in the API category 40 ° C kinematic viscosity: 12 mm 2 / s, 100 ° C kinematic viscosity: 3.0 mm 2 / s, viscosity index: 106 (Ester oil (A3-1)) Dioctyl sebacate 40 ° C. kinematic viscosity: 12 mm 2 / s, 100 ° C. kinematic viscosity: 3.2 mm 2 / s,
• reaction mixture was taken out from the three-necked flask, 4 liters of a 5 mol / L sodium hydroxide aqueous solution was added, and the mixture was stirred at room temperature (25 ° C.) for 4 hours to carry out a liquid separation operation. Then, the organic layer of the upper layer was taken out to obtain a solution of decent trimmer.
• ⁇ Viscosity index improver (B)> (Resin (B1) -1: comb-shaped polymer) It has at least a structural unit derived from a macromonomer having a mass average molecular weight (Mw) of 600,000, Mw / Mn: 2.9, SSI: 1, and Mn of 500 or more.
• the high temperature cleanliness of the lubricating oil compositions of Examples 1 to 4 and Comparative Examples 1 to 6 was evaluated. First, the oil temperature of the lubricating oil compositions of Examples 1 to 4 and Comparative Examples 1 to 6 was set to 150 ° C., and NO X gas having a concentration of 4,000 volume ppm was blown into the lubricating oil composition for 72 hours to lubricate the lubricating oil. The composition was degraded. By this deterioration treatment, the lubricating oil composition corresponds to the state after traveling about 16,000 km. The volume of the test container was 300 mL, and 100 mL of the lubricating oil composition was used.
• a hot tube test was performed on the deteriorated lubricating oil composition under the condition of temperature: 260 ° C.
• the score of 2.5 or more out of the scores of 0 to 10 in the hot tube test it was evaluated as a lubricating oil composition in which high temperature cleanliness was maintained for a long period of time.
• the oil film thickness of the lubricating oil composition obtained under the following conditions was measured.
• the oil film thickness was measured three times under the same conditions, and the average value of the three measured values was taken as the EHL oil film thickness of the lubricating oil composition.
• the EHL oil film thickness was 60 nm or more, it was evaluated as a lubricating oil composition having excellent oil film retention.
• EHD2 manufactured by PCS Instruments
• Test piece Steel Ball (diameter: 7.5 mm)
• -Disc Glass Disc coated with SiO 2 / Cr ⁇ Oil temperature: 100 ° C ⁇
• Load 20N (surface pressure: 0.5GPa)
• Speed 100 mm / s ⁇ Slip rate (SRR): 200%
• the lubricating oil compositions of Examples 1 to 4 have low evaporation properties, excellent oil film retention, and excellent high-temperature cleanliness.
• the aniline point is 95 ° C. or higher, and it can be seen that the rubber material compatibility is also excellent.
• the content of the second olefin polymer (A1-2) is 18.5% by mass or more based on the total amount of the base oil (A). , It can be seen that it is inferior in low evaporation. It can be seen that the lubricating oil composition of Comparative Example 2 is inferior in rubber material compatibility because the aniline point is at room temperature.
• the lubricating oil composition of Comparative Example 3 does not contain the first olefin polymer (A1-1), it can be seen that it is inferior in low evaporation property. It can be seen that the lubricating oil compositions of Comparative Examples 4 and 5 are inferior in high-temperature cleanliness because the nitrogen atom content derived from the imide-based dispersant (C) is less than 0.06% by mass. It can also be seen that the oil film retention is also inferior. Further, in the lubricating oil composition of Comparative Example 5, the content ratio of the resin content (B1) derived from the viscosity index improver (B) and the first olefin polymer (A1-1) [(B1) / (A1-A1-).
• the lubricating oil composition of Comparative Example 6 does not contain the viscosity index improver (B), and contains a resin component (B1) derived from the viscosity index improver (B) and a first olefin polymer (A1-1). Since the content ratio [(B1) / (A1-1)] is 0.001 or less in terms of mass ratio, it can be seen that the oil film retention is inferior.

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• 2021
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