EP2966154A1 - Lubricant oil composition - Google Patents
Lubricant oil composition Download PDFInfo
- Publication number
- EP2966154A1 EP2966154A1 EP14760010.0A EP14760010A EP2966154A1 EP 2966154 A1 EP2966154 A1 EP 2966154A1 EP 14760010 A EP14760010 A EP 14760010A EP 2966154 A1 EP2966154 A1 EP 2966154A1
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- EP
- European Patent Office
- Prior art keywords
- lubricating oil
- oil composition
- degrees
- less
- shear stability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
- C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
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- 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
- C10M157/00—Lubricating compositions characterised by the additive being a mixture of two or more macromolecular compounds covered by more than one of the main groups C10M143/00 - C10M155/00, each of these compounds being essential
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- 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
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- 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
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- 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
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- 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
- C10M2207/02—Hydroxy compounds
- C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
- C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
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- 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
- C10M2207/28—Esters
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- 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
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
- C10M2209/084—Acrylate; Methacrylate
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- 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
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
- C10M2215/064—Di- and triaryl amines
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- 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
- C10M2215/086—Imides
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- 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
- C10M2215/28—Amides; Imides
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- 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
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- 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
- C10N2020/019—Shear stability
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- 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
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- 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
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- 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
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- 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
- C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
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- 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
- C10N2030/68—Shear stability
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- 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
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- 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
- C10N2060/00—Chemical after-treatment of the constituents of the lubricating composition
- C10N2060/14—Chemical after-treatment of the constituents of the lubricating composition by boron or a compound containing boron
Definitions
- the present invention relates to a lubricating oil composition.
- a fuel-saving performance of the engine oil also needs to be further improved.
- an improvement in temperature-viscosity characteristics is effective for reducing friction in a fluid lubrication region.
- a viscosity index improver is used.
- a polymethacrylate (PMA), a polyolefin copolymer (OCP) and the like are used (Patent Literatures 1 to 4).
- PMA-based viscosity index improver that is excellent in temperature-viscosity characteristics is often used.
- the PMA-based viscosity index improver is not satisfactory in terms of the piston detergency under severer conditions of high temperatures and also may not be so favorable in terms of the shear stability. Accordingly, a lubricating oil composition exhibiting an excellent fuel-saving performance and maintaining favorable piston detergency and shear stability has been demanded.
- Patent Literatures 1 to 4 cannot maintain favorable piston detergency and shear stability although exhibiting an excellent fuel-saving performance.
- An object of the invention is to provide a lubricating oil composition exhibiting an excellent fuel-saving performance and capable of maintaining favorable piston detergency and shear stability.
- the invention provides a lubricating oil composition as follows.
- a lubricating oil composition according to the above aspect of the invention contains: a lubricating base oil; a component (A) that is a polymethacrylate having a mass average molecular weight in a range from 30,000 to 600,000; and a component (B) that is an olefin copolymer having a 95% weight-loss temperature of 500 degrees C or less as calculated by differential thermal analysis and having 40 or less of SSI (Shear Stability Index).
- SSI Shear Stability Index
- a manufacturing method of a lubricating oil composition according to the above another aspect of the invention includes blending: a lubricating base oil; a component (A) that is a polymethacrylate having a mass average molecular weight in a range from 30,000 to 600,000; and a component (B) that is an olefin copolymer having a 95% weight-loss temperature of 500 degrees C or less as calculated by differential thermal analysis and having 40 or less of SSI (Shear Stability Index).
- SSI Shear Stability Index
- a lubricating oil composition exhibiting an excellent fuel-saving performance and maintaining favorable piston detergency and shear stability can be provided.
- a lubricating oil composition in an exemplary embodiment of the invention (hereinafter, occasionally simply referred to as “the present composition”) is provided by blending: a lubricating base oil; a component (A) that is a polymethacrylate having a mass average molecular weight in a range from 30,000 to 600,000; and a component (B) that is an olefin copolymer having a 95% weight-loss temperature of 500 degrees C or less as calculated by differential thermal analysis and having 40 or less of SSI (Shear Stability Index).
- SSI Shear Stability Index
- the lubricating base oil used in the present composition may be a mineral lubricating base oil or a synthetic lubricating base oil.
- the kind of the lubricating base oil is not particularly limited but may be suitably selected from any mineral oil and synthetic oil that have been conventionally used as a lubricating base oil for an internal combustion engine.
- a viscosity index of the lubricating oil composition is preferably 120 or more in terms temperature-viscosity characteristics and shear stability.
- Examples of the mineral lubricating base oil include a paraffinic mineral oil, an intermediate mineral oil and a naphthenic mineral oil.
- Examples of the synthetic lubricating base oil include polybutene, polyolefin, polyol ester, diacid ester, phosphate, polyphenyl ether, polyglycol, alkylbenzene and alkylnaphthalene.
- Examples of polyolefin include an ⁇ -olefin homopolymer and an ⁇ -olefin copolymer.
- One of the above base oils may be used alone or a combination of two or more thereof may be used.
- the component (A) of the present composition is a polymethacrylate (PMA) having a mass average molecular weight in a range from 30,000 to 600,000.
- PMA polymethacrylate
- the mass average molecular weight of the component (A) is more preferably in a range from 200,000 to 600,000, further preferably in a range from 350,0000 to 450,000, particularly preferably in a range from 380,0000 to 420,000.
- the polymethacrylate may be a non-dispersed polymethacrylate or a dispersed polymethacrylate.
- a content of the component (A) is preferably in a range from 1 mass% to 20 mass% of a total amount of the composition, more preferably in a range from 2 mass% to 15 mass%.
- a viscosity index-improving effect tends to be insufficient.
- the content exceeds the above upper limit, the shear stability and piston detergency of the lubricating oil composition tend to be lowered.
- the component (B) of the present composition is an olefin copolymer (OCP) having a 95% weight-loss temperature of 500 degrees C or less as calculated by differential thermal analysis and having 40 or less of SSI.
- OCP olefin copolymer
- the SSI of the component (B) is more preferably 30 or less, further preferably in a range from 2 to 30, particularly preferably in a range from 2 to 20, most preferably in a range from 6 to 19.
- the 95% weight-loss temperature of the component (B) is more preferably 480 degrees C or less, particularly preferably in a range from 461 degrees C to 476 degrees C.
- the 95% weight-loss temperature can be measured using a known differential thermal analyzer. Test conditions are, for instance, in nitrogen, a flow rate of 200 mL/min, a temperature-increasing rate of 10 degrees C/min, use of a platinum pan, and a sample amount of 6 mg.
- SSI can be calculated by: measuring a kinematic viscosity at 100 degrees C of an unused oil, a kinematic viscosity at 100 degrees C of the oil after a shear stability test (ASTM D6278) and a kinematic viscosity at 100 degrees C of the base oil; and applying the obtained measurement values to a formula: (kinematic viscosity of an unused oil - kinematic viscosity of the oil after the shear stability test) / (kinematic viscosity of the unused oil - kinematic viscosity of the base oil) X 100.
- olefin copolymer examples include an ethylene-propylene copolymer, an ethylene-butylene copolymer, a styrene-isoprene copolymer and a styrene-butadiene copolymer.
- a content of the component (B) is preferably in a range from 1 mass% to 15 mass% of the total amount of the composition, more preferably in a range from 2 mass% to 10 mass%.
- the present composition may be added with various additives described below as long as the advantages of the invention are not hampered.
- a detergent dispersant, antioxidant, antiwear agent or extreme pressure agent, pour point depressant, friction reducing agent, metal deactivator, rust inhibitor, surfactant or demulsifier, antifoaming agent, anticorrosive agent, friction modifier, oiliness agent and acid scavenger can be suitably blended in use.
- an ashless dispersant and a metal detergent are usable.
- the ashless dispersant include a succinimide compound, a boron imide compound, a Mannich dispersant and an acid amide compound.
- polybutenyl succinimide and polybutenyl succinimide borate are preferable.
- One of the above ashless dispersants may be used alone or a combination of two or more thereof may be used.
- a content of the ashless dispersant is not particularly limited, but is preferably in a range from 0.1 mass% to 10 mass% of the total amount of the composition.
- the metal detergent examples include alkali metal sulfonate, alkali metal phenate, alkali metal salicylate, alkali metal naphthenate, alkaline earth metal sulfonate, alkaline earth metal phenate, alkaline earth metal salicylate, and alkaline earth metal naphthenate.
- alkaline earth metal salicylate is preferable.
- calcium and magnesium are preferable.
- One of the above metal detergents may be used alone or a combination of two or more thereof may be used.
- a content of the metal detergent is not particularly limited, but is preferably in a range from 0.05 mass% to 0.3 mass% of the total amount of the composition in terms of metals.
- antioxidants examples include an amine antioxidant, a phenolic antioxidant and a sulfur antioxidant.
- One of the above antioxidants may be used alone or a combination of two or more thereof may be used.
- a content of the antioxidant is not particularly limited, but is preferably in a range from 0.05 mass% to 7 mass% of the total amount of the composition.
- Examples of the antiwear agent or extreme pressure agent include phosphorus extreme pressure agent and sulfur extreme pressure agent.
- Examples of the phosphorus extreme pressure agent include phosphites, phosphates, thiophosphates and an amine salt or a metal salt thereof.
- Examples of the sulfur extreme pressure agent include an olefin sulfide, a sulfurized fat and oil, an ester sulfide, thiocarbonates, dithiocarbamates and polysulfides.
- One of the above antiwear agent or extreme pressure agent may be used alone or a combination of two or more thereof may be used.
- a content of the antiwear agent or extreme pressure agent is not particularly limited, but is preferably in a range from 0.1 mass% to 10 mass% of the total amount of the composition.
- the present composition usually contains the blended components per se.
- the present composition includes a composition of the blended components, at least a part of which may be reacted to become a compound different from the blended components.
- a manufacturing method of a lubricating oil composition in the exemplary embodiment includes blending the lubricating base oil, the component (A) and the component (B).
- various additives described above may be further added to the lubricating base oil as needed.
- the present composition prepared based on the above blend composition is not particularly limited, but preferably satisfies the following conditions.
- the present composition preferably has a kinematic viscosity at 100 degrees C in a range from 2 mm 2 /s to 20 mm 2 /s, more preferably in a range from 5.6 mm 2 /s to less than 12.5 mm 2 /s.
- the kinematic viscosity can be measured by a method of JIS K 2283.
- the kinematic viscosity at 100 degrees C is in a range from 9.3 mm 2 /s to less than 12.5 mm 2 /s
- the kinematic viscosity at 100 degrees C after the shear stability test is preferably 9.3 mm 2 /s or more, more preferably in a range from 9.3 mm 2 /s to 10 mm 2 /s.
- the kinematic viscosity at 100 degrees C is in a range from 5.6 mm 2 /s to less than 9.3 mm 2 /s
- the kinematic viscosity at 100 degrees C after the shear stability test is preferably 5.6 mm 2 /s or more.
- the shear stability test can be conducted by a test method defined in ASTM D6278.
- the viscosity index is preferably 150 or more, more preferably 170 or more. When the viscosity index is less than the lower limit, temperature dependency of the viscosity is adversely increased.
- the viscosity index can be measured by a method of JIS K 2283.
- a phosphorus content of the present composition is preferably 0.12 mass% or less of the total amount of the composition in order to decrease a phosphorus content in the present composition.
- lubricating oil compositions (hereinafter, also referred to as sample oils) shown in Table 1 were prepared using the following base oils and additives. Note that the viscosity grade of each of the sample oils was adjusted to 5W-30 in performing experiments.
- Measurement was conducted by a method defined in ASTM D4683 using a TBS (Tapered Bearing Simulator) high temperature viscometer.
- a shear stability test (30 cycles) was conducted by a test method defined in ASTM D6278. After the test, a kinematic viscosity at 100 degrees C was measured in accordance with "Test Method of Kinematic Viscosity of Petroleum Products" defined in JIS K 2283.
- a test device below was filled with each of the sample oils.
- a motoring torque test was conducted to measure a motoring torque. Test conditions are shown below. Note that lower motoring torque indicates more favorable fuel-saving performance.
- Test Device an engine motoring-driving torque measurement machine
- Sample Engine an in-line four-cylinder gasoline engine (2 liter displacement, a roller type valve train system)
- Test Conditions an oil temperature of 60 degrees C and 100 degrees C; and revolution rate of 1500 rpm
- Evaluation Item torque (unit: N ⁇ m) when the engine was driven.
- Test device panel coking (panecon) test machine
- Test Conditions panel temperature of 300 degrees C; an oil temperature of 100 degrees C; and a duration time of three hours (operation of splashing for 15 seconds and halting for 45 seconds)
- Evaluation Item an amount of the deposit on the panel after the test
- the lubricating oil composition of the invention maintained the kinematic viscosity after the shear stability test at a stay-in-grade kinematic viscosity of 9.3 mm 2 /s or more (i.e., favorable shear stability), provided less amount of the deposit in the panel coking test (i.e., favorable piston detergency), and exhibited a low motoring torque (i.e., favorable fuel-saving performance).
- the sample oils of Comparatives I and 2 it was found that the motoring torque was low but the shear stability and the piston detergency were deteriorated since only the polymethacrylate was contained.
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- Chemical & Material Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
Description
- The present invention relates to a lubricating oil composition.
- In response to the demand for reducing environmental burden, reduction of CO2 has strongly been desired worldwide as a countermeasure against global warming. An improvement in a fuel efficiency of an automobile is crucial for reduction of CO2. A small and light-weight engine having a high power has been increasingly used. Accordingly, it is concerned that piston detergency of an engine oil may be deteriorated by an increase in heat load.
- Moreover, a fuel-saving performance of the engine oil also needs to be further improved. In order to improve the fuel-saving performance of the engine oil, an improvement in temperature-viscosity characteristics is effective for reducing friction in a fluid lubrication region. In order to improve the temperature-viscosity characteristics, a viscosity index improver is used. As the viscosity index improver, a polymethacrylate (PMA), a polyolefin copolymer (OCP) and the like are used (Patent Literatures 1 to 4). Particularly, PMA-based viscosity index improver that is excellent in temperature-viscosity characteristics is often used. However, the PMA-based viscosity index improver is not satisfactory in terms of the piston detergency under severer conditions of high temperatures and also may not be so favorable in terms of the shear stability. Accordingly, a lubricating oil composition exhibiting an excellent fuel-saving performance and maintaining favorable piston detergency and shear stability has been demanded.
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- Patent Literature 1:
JP-A-2008-184569 - Patent Literature 2:
JP-A-2010-280817 - Patent Literature 3:
JP-A-2008-248139 - Patent Literature 4:
JP-A-2010-043250 - However, the lubricating oil compositions disclosed in Patent Literatures 1 to 4 cannot maintain favorable piston detergency and shear stability although exhibiting an excellent fuel-saving performance.
- An object of the invention is to provide a lubricating oil composition exhibiting an excellent fuel-saving performance and capable of maintaining favorable piston detergency and shear stability.
- In order to solve the above problem, the invention provides a lubricating oil composition as follows.
- (1) According to an aspect of the invention, a lubricating oil composition includes: a lubricating base oil; a component (A) that is a polymethacrylate having a mass average molecular weight in a range from 30,000 to 600,000; and a component (B) that is an olefin copolymer having a 95% weight-loss temperature of 500 degrees C or less as calculated by differential thermal analysis and having 40 or less of a shear stability index.
- (2) With the above arrangement, the component (A) is a polymethacrylate having a mass average molecular weight in a range from 200,000 to 600,000, and the shear stability index of the component (B) is 30 or less.
- (3) With the above arrangement, when the lubricating oil composition has a kinematic viscosity at 100 degrees C in a range from 9.3 mm2/s to less than 12.5 mm2/s, the kinematic viscosity at 100 degrees C of the lubricating oil composition after a shear stability test is 9.3 mm2/s or more.
- (4) With the above arrangement, the kinematic viscosity at 100 degrees C of the lubricating oil composition after the shear stability test is 10 mm2/s or less.
- (5) With the above arrangement, when the lubricating oil composition has a kinematic viscosity at 100 degrees C in a range from 5.6 mm2/s to less than 9.3 mm2/s, the kinematic viscosity at 100 degrees C of the lubricating oil composition after a shear stability test is 5.6 mm2/s or more.
- (6) With the above arrangement, the lubricating oil composition has a viscosity index of 120 or more.
- (7) With the above arrangement, a phosphorus content is 0.12 mass% or less of a total amount of the composition.
- (8) With the above arrangement, the lubricating oil composition further includes a metal detergent, a content of the metal detergent being in a range from 0.05 mass% to 0.3 mass% of the total amount of the composition in terms of metals.
- (9) With the above arrangement, the lubricating oil composition further includes at least one ashless dispersant selected from the group consisting of polybutenyl succinimide and polybutenyl succinimide borate.
- (10) With the above arrangement, the lubricating oil composition is used for an internal combustion engine.
- A lubricating oil composition according to the above aspect of the invention contains: a lubricating base oil; a component (A) that is a polymethacrylate having a mass average molecular weight in a range from 30,000 to 600,000; and a component (B) that is an olefin copolymer having a 95% weight-loss temperature of 500 degrees C or less as calculated by differential thermal analysis and having 40 or less of SSI (Shear Stability Index).
- A manufacturing method of a lubricating oil composition according to the above another aspect of the invention includes blending: a lubricating base oil; a component (A) that is a polymethacrylate having a mass average molecular weight in a range from 30,000 to 600,000; and a component (B) that is an olefin copolymer having a 95% weight-loss temperature of 500 degrees C or less as calculated by differential thermal analysis and having 40 or less of SSI (Shear Stability Index).
- According to the above aspect of the invention, a lubricating oil composition exhibiting an excellent fuel-saving performance and maintaining favorable piston detergency and shear stability can be provided.
- A lubricating oil composition in an exemplary embodiment of the invention (hereinafter, occasionally simply referred to as "the present composition") is provided by blending: a lubricating base oil; a component (A) that is a polymethacrylate having a mass average molecular weight in a range from 30,000 to 600,000; and a component (B) that is an olefin copolymer having a 95% weight-loss temperature of 500 degrees C or less as calculated by differential thermal analysis and having 40 or less of SSI (Shear Stability Index). The present composition will be described in detail below.
- The lubricating base oil used in the present composition may be a mineral lubricating base oil or a synthetic lubricating base oil. The kind of the lubricating base oil is not particularly limited but may be suitably selected from any mineral oil and synthetic oil that have been conventionally used as a lubricating base oil for an internal combustion engine. A viscosity index of the lubricating oil composition is preferably 120 or more in terms temperature-viscosity characteristics and shear stability.
- Examples of the mineral lubricating base oil include a paraffinic mineral oil, an intermediate mineral oil and a naphthenic mineral oil. Examples of the synthetic lubricating base oil include polybutene, polyolefin, polyol ester, diacid ester, phosphate, polyphenyl ether, polyglycol, alkylbenzene and alkylnaphthalene. Examples of polyolefin include an α-olefin homopolymer and an α-olefin copolymer. One of the above base oils may be used alone or a combination of two or more thereof may be used.
- The component (A) of the present composition is a polymethacrylate (PMA) having a mass average molecular weight in a range from 30,000 to 600,000. When the mass average molecular weight is less than the above lower limit, the fuel-saving performance is deteriorated. On the other hand, when the mass average molecular weight exceeds the above upper limit, the shear stability of the lubricating oil composition is lowered. The mass average molecular weight of the component (A) is more preferably in a range from 200,000 to 600,000, further preferably in a range from 350,0000 to 450,000, particularly preferably in a range from 380,0000 to 420,000.
- The polymethacrylate may be a non-dispersed polymethacrylate or a dispersed polymethacrylate.
- A content of the component (A) is preferably in a range from 1 mass% to 20 mass% of a total amount of the composition, more preferably in a range from 2 mass% to 15 mass%. When the content is less than the above lower limit, a viscosity index-improving effect tends to be insufficient. On the other hand, when the content exceeds the above upper limit, the shear stability and piston detergency of the lubricating oil composition tend to be lowered.
- The component (B) of the present composition is an olefin copolymer (OCP) having a 95% weight-loss temperature of 500 degrees C or less as calculated by differential thermal analysis and having 40 or less of SSI. When the 95% weight-loss temperature exceeds 500 degrees C, the piston detergency of the lubricating oil composition is lowered. When SSI exceeds 40, the shear stability of the lubricating oil composition is lowered. The SSI of the component (B) is more preferably 30 or less, further preferably in a range from 2 to 30, particularly preferably in a range from 2 to 20, most preferably in a range from 6 to 19. The 95% weight-loss temperature of the component (B) is more preferably 480 degrees C or less, particularly preferably in a range from 461 degrees C to 476 degrees C.
- The 95% weight-loss temperature can be measured using a known differential thermal analyzer. Test conditions are, for instance, in nitrogen, a flow rate of 200 mL/min, a temperature-increasing rate of 10 degrees C/min, use of a platinum pan, and a sample amount of 6 mg. SSI can be calculated by: measuring a kinematic viscosity at 100 degrees C of an unused oil, a kinematic viscosity at 100 degrees C of the oil after a shear stability test (ASTM D6278) and a kinematic viscosity at 100 degrees C of the base oil; and applying the obtained measurement values to a formula: (kinematic viscosity of an unused oil - kinematic viscosity of the oil after the shear stability test) / (kinematic viscosity of the unused oil - kinematic viscosity of the base oil) X 100.
- Examples of the olefin copolymer include an ethylene-propylene copolymer, an ethylene-butylene copolymer, a styrene-isoprene copolymer and a styrene-butadiene copolymer.
- A content of the component (B) is preferably in a range from 1 mass% to 15 mass% of the total amount of the composition, more preferably in a range from 2 mass% to 10 mass%.
- The present composition may be added with various additives described below as long as the advantages of the invention are not hampered. Specifically, a detergent dispersant, antioxidant, antiwear agent or extreme pressure agent, pour point depressant, friction reducing agent, metal deactivator, rust inhibitor, surfactant or demulsifier, antifoaming agent, anticorrosive agent, friction modifier, oiliness agent and acid scavenger can be suitably blended in use.
- As the detergent dispersant, an ashless dispersant and a metal detergent are usable. Examples of the ashless dispersant include a succinimide compound, a boron imide compound, a Mannich dispersant and an acid amide compound. Among the above, polybutenyl succinimide and polybutenyl succinimide borate are preferable. One of the above ashless dispersants may be used alone or a combination of two or more thereof may be used.
- A content of the ashless dispersant is not particularly limited, but is preferably in a range from 0.1 mass% to 10 mass% of the total amount of the composition.
- Examples of the metal detergent include alkali metal sulfonate, alkali metal phenate, alkali metal salicylate, alkali metal naphthenate, alkaline earth metal sulfonate, alkaline earth metal phenate, alkaline earth metal salicylate, and alkaline earth metal naphthenate. Among the above metal detergents, alkaline earth metal salicylate is preferable. Among the above alkaline earth metals, calcium and magnesium are preferable. One of the above metal detergents may be used alone or a combination of two or more thereof may be used.
- A content of the metal detergent is not particularly limited, but is preferably in a range from 0.05 mass% to 0.3 mass% of the total amount of the composition in terms of metals.
- Examples of the antioxidant include an amine antioxidant, a phenolic antioxidant and a sulfur antioxidant. One of the above antioxidants may be used alone or a combination of two or more thereof may be used.
- A content of the antioxidant is not particularly limited, but is preferably in a range from 0.05 mass% to 7 mass% of the total amount of the composition.
- Examples of the antiwear agent or extreme pressure agent include phosphorus extreme pressure agent and sulfur extreme pressure agent. Examples of the phosphorus extreme pressure agent include phosphites, phosphates, thiophosphates and an amine salt or a metal salt thereof. Examples of the sulfur extreme pressure agent include an olefin sulfide, a sulfurized fat and oil, an ester sulfide, thiocarbonates, dithiocarbamates and polysulfides. One of the above antiwear agent or extreme pressure agent may be used alone or a combination of two or more thereof may be used.
- A content of the antiwear agent or extreme pressure agent is not particularly limited, but is preferably in a range from 0.1 mass% to 10 mass% of the total amount of the composition.
- The present composition usually contains the blended components per se. However, the present composition includes a composition of the blended components, at least a part of which may be reacted to become a compound different from the blended components.
- A manufacturing method of a lubricating oil composition in the exemplary embodiment includes blending the lubricating base oil, the component (A) and the component (B). In the above manufacturing method, various additives described above may be further added to the lubricating base oil as needed.
- The present composition prepared based on the above blend composition is not particularly limited, but preferably satisfies the following conditions.
- The present composition preferably has a kinematic viscosity at 100 degrees C in a range from 2 mm2/s to 20 mm2/s, more preferably in a range from 5.6 mm2/s to less than 12.5 mm2/s. The kinematic viscosity can be measured by a method of JIS K 2283.
- When the kinematic viscosity at 100 degrees C is in a range from 9.3 mm2/s to less than 12.5 mm2/s, the kinematic viscosity at 100 degrees C after the shear stability test is preferably 9.3 mm2/s or more, more preferably in a range from 9.3 mm2/s to 10 mm2/s.
- When the kinematic viscosity at 100 degrees C is in a range from 5.6 mm2/s to less than 9.3 mm2/s, the kinematic viscosity at 100 degrees C after the shear stability test is preferably 5.6 mm2/s or more.
- When the kinematic viscosity at 100 degrees C after the shear stability test is less than the lower limit, the shear stability tends to be insufficient. For instance, particularly, when a viscosity grade of the present composition is 5W-30, the kinematic visocity of the present composition cannot achieve a stay-in-grade. On the other hand, when the kinematic viscosity at 100 degrees C after the shear stability test exceeds the upper limit, the fuel-saving performance tends to be deteriorated. The shear stability test can be conducted by a test method defined in ASTM D6278.
- The viscosity index is preferably 150 or more, more preferably 170 or more. When the viscosity index is less than the lower limit, temperature dependency of the viscosity is adversely increased. The viscosity index can be measured by a method of JIS K 2283.
- A phosphorus content of the present composition is preferably 0.12 mass% or less of the total amount of the composition in order to decrease a phosphorus content in the present composition.
- Next, the invention will be further described in detail based on Examples, which by no means limit the invention.
- In Examples and Comparatives, lubricating oil compositions (hereinafter, also referred to as sample oils) shown in Table 1 were prepared using the following base oils and additives. Note that the viscosity grade of each of the sample oils was adjusted to 5W-30 in performing experiments.
-
- (1) Lubricating Base Oil: hydrorefined base oil with a kinematic viscosity at 40 degrees C of 19.6 mm2/s, a kinematic viscosity at 100 degrees C of 4.2 mm2/s, a viscosity index of 122; %CA of 0.0, and a sulfur content of less than 10 ppm by mass.
- (2) Viscosity Index Improver PMA1: a polymethacrylate with a mass average molecular weight of 380,000
- (3) Viscosity Index Improver PMA2: a polymethacrylate with a mass average molecular weight of 420,000
- (4) Viscosity Index Improver PMA3: a polymethacrylate with a mass average molecular weight of 25,000
- (5) Viscosity Index Improver OCP1: an olefin copolymer with a shear stability index of 6 and a 95% weight-loss temperature of 464 degrees C as calculated by differential thermal analysis
- (6) Viscosity Index Improver OCP2: an olefin copolymer with a shear stability index of 15 and a 95% weight-loss temperature of 476 degrees C as calculated by differential thermal analysis
- (7) Viscosity Index Improver OCP3: an olefin copolymer with a shear stability index of 19 and a 95% weight-loss temperature of 461 degrees C as calculated by differential thermal analysis
- (8) Viscosity Index Improver OCP4: an olefin copolymer with a shear stability index of 50 and a 95% weight-loss temperature of 480 degrees C as calculated by differential thermal analysis
- (9) Viscosity Index Improver OCP5: an olefin copolymer with a shear stability index of 20 and a 95% weight-loss temperature of 520 degrees C as calculated by differential thermal analysis
- (10) Zinc Dialkyldithiophosphate A: primary alkyl zinc dialkyldithiophosphate with a zinc content of 8.9 mass% and a phosphorus content of 7.4 mass%
- (11) Zinc Dialkyldithiophosphate B: secondary alkyl zinc dialkyldithiophosphate with a zinc content of 9.0 mass% and a phosphorus content of 8.2 mass%
- (12) Antioxidant A: amine antioxidant
- (13) Antioxidant B: phenolic antioxidant
- (14) Metal Detergent A: overbased calcium salicylate with a base number of 350 mg KOH/g (perchloric acid method) and a calcium content of 12.1 mass%
- (15) Metal Detergent B: overbased calcium salicylate with a base number of 225 mg KOH/g (perchloric acid method) and a calcium content of 7.8 mass%
- (16) Polybutenyl Succinic Bisimide: a number average molecular weight of the polybutenyl group being 2000; a base number of 11.9 mg KOH/g (perchloric acid method); and a nitrogen content of 0.99 mass%
- (17) Polybutenyl Succinic Monoimide Borate: a number average molecular weight of the polybutenyl group being 1000; a base number of 25 mg KOH/g (perchloric acid method); a nitrogen content of 1.23 mass%; and a boron content of 1.3 mass% (18) Other Additives: a pour point depressant; a rust inhibitor; and the like
- Next, properties and characteristics of each of the sample oils were measured or calculated. Measurement methods or calculation methods are described below. Results are shown in Table 1.
- Measurement was conducted in accordance with "Test Method of Kinematic Viscosity of Petroleum Products" defined in JIS K 2283.
- Measurement was conducted by a method defined in ASTM D4683 using a TBS (Tapered Bearing Simulator) high temperature viscometer.
- A shear stability test (30 cycles) was conducted by a test method defined in ASTM D6278. After the test, a kinematic viscosity at 100 degrees C was measured in accordance with "Test Method of Kinematic Viscosity of Petroleum Products" defined in JIS K 2283.
- A test device below was filled with each of the sample oils. A motoring torque test was conducted to measure a motoring torque. Test conditions are shown below. Note that lower motoring torque indicates more favorable fuel-saving performance.
- Test Device: an engine motoring-driving torque measurement machine
- Sample Engine: an in-line four-cylinder gasoline engine (2 liter displacement, a roller type valve train system)
- Test Conditions: an oil temperature of 60 degrees C and 100 degrees C; and revolution rate of 1500 rpm
- Evaluation Item: torque (unit: N·m) when the engine was driven.
- An amount of deposit was measured using a test device below. Test conditions are shown below. Note that less mount of the deposit in the panel coking test indicates more favorable piston detergency.
- Test device: panel coking (panecon) test machine
- Test Conditions: panel temperature of 300 degrees C; an oil temperature of 100 degrees C; and a duration time of three hours (operation of splashing for 15 seconds and halting for 45 seconds)
-
- As obvious from the results shown in Table 1, it was observed that the lubricating oil composition of the invention (in Examples 1 to 3) maintained the kinematic viscosity after the shear stability test at a stay-in-grade kinematic viscosity of 9.3 mm2/s or more (i.e., favorable shear stability), provided less amount of the deposit in the panel coking test (i.e., favorable piston detergency), and exhibited a low motoring torque (i.e., favorable fuel-saving performance). On the other hand, in the sample oils of Comparatives I and 2, it was found that the motoring torque was low but the shear stability and the piston detergency were deteriorated since only the polymethacrylate was contained. Moreover, in the sample oil of Comparative 3 containing only the olefin copolymer, it was found that the motoring torque was increased. In the sample oil of Comparative 4, it was found that the kinematic viscosity after the shear stability test did not satisfy the stay-in-grade kinematic viscosity (9.3 mm2/s or more) since the olefin copolymer having a poor shear stability (i.e., a high SSI) was contained. In the sample oil of Comparative 5, it was found that the piston detergency was deteriorated since the olefin copolymer having 500 degrees C or more of the 95% weight-loss temperature calculated by the differential thermal analysis was contained. In the sample oil of Comparative 6, it was found that the temperature-viscosity characteristics were deteriorated and the motoring torque was increased (i.e., poor fuel-saving performance) since the amount of the contained polymethacrylate was below the lower limit of the range of the molecular weight of the invention.
Claims (10)
- A lubricating oil composition comprising:a lubricating base oil;a component (A) that is a polymethacrylate having a mass average molecular weight in a range from 30,000 to 600,000; anda component (B) that is an olefin copolymer having a 95% weight-loss temperature of 500 degrees C or less as calculated by differential thermal analysis and having 40 or less of a shear stability index.
- The lubricating oil composition according to claim 1, wherein
the component (A) is a polymethacrylate having a mass average molecular weight in a range from 200,000 to 600,000, and
the shear stability index of the component (B) is 30 or less. - The lubricating oil composition according to claim 1 or 2, wherein
when the lubricating oil composition has a kinematic viscosity at 100 degrees C in a range from 9.3 mm2/s to less than 12.5 mm2/s, the kinematic viscosity at 100 degrees C of the lubricating oil composition after a shear stability test is 9.3 mm2/s or more. - The lubricating oil composition according to claim 3, wherein
the kinematic viscosity at 100 degrees C of the lubricating oil composition after the shear stability test is 10 mm2/s or less. - The lubricating oil composition according to claim 1 or 2, wherein
when the lubricating oil composition has a kinematic viscosity at 100 degrees C in a range from 5.6 mm2/s to less than 9.3 mm2/s, the kinematic viscosity at 100 degrees C of the lubricating oil composition after a shear stability test is 5.6 mm2/s or more. - The lubricating oil composition according to any one of claims 1 to 5, wherein
the lubricating oil composition has a viscosity index of 120 or more. - The lubricating oil composition according to any one of claims 1 to 6, wherein
a phosphorus content is 0.12 mass% or less of a total amount of the composition. - The lubricating oil composition according to any one of claims 1 to 7, further comprising:a metal detergent, a content of the metal detergent being in a range from 0.05 mass% to 0.3 mass% of the total amount of the composition in terms of metals.
- The lubricating oil composition according to any one of claims 1 to 8, further comprising:at least one ashless dispersant selected from the group consisting of polybutenyl succinimide and polybutenyl succinimide borate.
- The lubricating oil composition according to any one of claims 1 to 9, wherein the lubricating oil composition is used for an internal combustion engine.
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EP (1) | EP2966154A4 (en) |
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EP3395931A4 (en) * | 2015-12-25 | 2019-08-14 | Idemitsu Kosan Co.,Ltd. | Mineral base oil, lubricant composition, internal combustion engine, lubricating method of internal combustion engine |
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JP6420964B2 (en) * | 2014-03-31 | 2018-11-07 | 出光興産株式会社 | Lubricating oil composition for internal combustion engines |
JP6927488B2 (en) * | 2017-03-30 | 2021-09-01 | 出光興産株式会社 | A lubricating oil composition for a two-wheeled vehicle, a method for improving the fuel efficiency of a two-wheeled vehicle using the lubricating oil composition, and a method for producing the lubricating oil composition. |
SG11202008166YA (en) | 2018-03-02 | 2020-09-29 | Chevron Oronite Tech Bv | Lubricating oil composition providing wear protection at low viscosity |
JP2021515081A (en) | 2018-03-02 | 2021-06-17 | シェブロン・オロナイト・テクノロジー・ビー.ブイ. | Lubricating oil composition with low viscosity and providing anti-wear |
JP6744047B2 (en) * | 2018-03-30 | 2020-08-19 | 出光興産株式会社 | Lubricating oil composition and method of using lubricating oil composition |
WO2022039105A1 (en) * | 2020-08-21 | 2022-02-24 | 出光興産株式会社 | Lubricating oil composition, shock absorber, and method for using lubricating oil composition |
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JPS63210198A (en) * | 1987-02-27 | 1988-08-31 | Idemitsu Kosan Co Ltd | Multigrade engine oil composition |
FR2642435B1 (en) * | 1989-01-27 | 1994-02-11 | Organo Synthese Ste Fse | VISCOSITY ADDITIVE FOR LUBRICATING OILS, PROCESS FOR THE PREPARATION THEREOF, AND LUBRICANT COMPOSITIONS BASED ON SAID ADDITIVE |
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JP4076634B2 (en) * | 1998-09-09 | 2008-04-16 | 新日本石油株式会社 | 4-cycle engine oil composition for motorcycles |
JP2000322777A (en) * | 1999-05-10 | 2000-11-24 | Mitsubishi Chemicals Corp | Production of substrate for recording medium, substrate for recording medium and recording medium |
JP2002003874A (en) * | 2000-06-21 | 2002-01-09 | Sanyo Chem Ind Ltd | Viscosity index improver and lubricating oil composition |
US7875576B2 (en) * | 2004-07-29 | 2011-01-25 | Chevron Oronite Company Llc | Lubricating oil composition for internal combustion engines |
ES2666595T3 (en) * | 2006-10-24 | 2018-05-07 | Total Marketing Services | Use of a multifunctional lubricating fluid |
JP5565999B2 (en) | 2007-01-31 | 2014-08-06 | Jx日鉱日石エネルギー株式会社 | Lubricating oil composition |
JP5512072B2 (en) | 2007-03-30 | 2014-06-04 | Jx日鉱日石エネルギー株式会社 | Lubricating oil composition |
JP5330716B2 (en) * | 2008-03-17 | 2013-10-30 | 出光興産株式会社 | Lubricating oil composition |
EP2154230A1 (en) * | 2008-08-08 | 2010-02-17 | Afton Chemical Corporation | Lubricant additive compositions having improved viscosity index increasing properties |
JP5551599B2 (en) * | 2008-09-19 | 2014-07-16 | 出光興産株式会社 | Lubricating oil composition for internal combustion engines |
JP2010280817A (en) | 2009-06-04 | 2010-12-16 | Jx Nippon Oil & Energy Corp | Lubricant composition |
WO2010140446A1 (en) * | 2009-06-04 | 2010-12-09 | 新日本石油株式会社 | Lubricant oil composition |
JP5727713B2 (en) * | 2010-03-19 | 2015-06-03 | 出光興産株式会社 | Lubricating oil composition for internal combustion engines |
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EP3395931A4 (en) * | 2015-12-25 | 2019-08-14 | Idemitsu Kosan Co.,Ltd. | Mineral base oil, lubricant composition, internal combustion engine, lubricating method of internal combustion engine |
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EP2966154A4 (en) | 2016-12-07 |
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