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
  • 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
• • 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
• • 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
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
• • 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
• • 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
• • 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
• • 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
• • 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
• • 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
• • 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
• • 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
  • 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
• • 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
  • 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
  • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
• • 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
• • 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
• • 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 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
• 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 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.
• 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 kinematic viscosity at 100 degrees C. of the lubricating oil composition after a shear stability test is 9.3 mm 2 /s or more.
• the kinematic viscosity at 100 degrees C. of the lubricating oil composition after the shear stability test is 10 mm 2 /s or less.
• the lubricating oil composition has a viscosity index of 120 or more.
• a phosphorus content is 0.12 mass % or less of a total amount of the composition.
• 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.
• 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).
• 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 %.
• the content is less than the above lower limit, 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 (13) 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.
• 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.
• ashless dispersant examples include a succinimide compound, a boron imide compound, a Mannich dispersant and an acid amide compound.
• succinimide compound examples 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.
• Lubricating Base Oil hydrorefined base oil with a kinematic viscosity at 40 degrees C. of 19.6 mm 2 /s, a kinematic viscosity at 100 degrees C. of 4.2 mm 2 /s, a viscosity index of 122; % CA of 0.0, and a sulfur content of less than 10 ppm by mass.
• Viscosity Index Improver PMA1 a polymethacrylate with a mass average molecular weight of 380,000
• Viscosity Index Improver PMA2 a polymethacrylate with a mass average molecular weight of 420,000
• Viscosity Index Improver PMA3 a polymethacrylate with a mass average molecular weight of 25,000
• Viscosity Index Improver OCP1 an olefin copolymer with a shear stability index of 6 and a 95% weight-loss temperature of 464 degrees C.
• 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.
• 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 %
• Antioxidant A amine antioxidant (13)
• Antioxidant B phenolic antioxidant
• 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 %
• Metal Detergent B overbased calcium salicylate with a base number of
• 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 1 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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• General Chemical & Material Sciences (AREA)
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• Lubricants (AREA)

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• 2014
  • 2014-02-27 EP EP14760010.0A patent/EP2966154A4/en not_active Withdrawn
  • 2014-02-27 JP JP2015504263A patent/JP6293115B2/ja active Active
  • 2014-02-27 CN CN201480012065.6A patent/CN105121613A/zh active Pending
  • 2014-02-27 US US14/772,201 patent/US20160002563A1/en not_active Abandoned
  • 2014-02-27 WO PCT/JP2014/054815 patent/WO2014136643A1/ja active Application Filing

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