WO2014017558A1 - Améliorant d'indice de viscosité à base de poly(méth)acrylate, et composition d'huile lubrifiante et additif pour huile lubrifiante le contenant - Google Patents

Améliorant d'indice de viscosité à base de poly(méth)acrylate, et composition d'huile lubrifiante et additif pour huile lubrifiante le contenant Download PDF

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Publication number
WO2014017558A1
WO2014017558A1 PCT/JP2013/070100 JP2013070100W WO2014017558A1 WO 2014017558 A1 WO2014017558 A1 WO 2014017558A1 JP 2013070100 W JP2013070100 W JP 2013070100W WO 2014017558 A1 WO2014017558 A1 WO 2014017558A1
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WIPO (PCT)
Prior art keywords
viscosity index
meth
index improver
lubricating oil
molecular weight
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PCT/JP2013/070100
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English (en)
Japanese (ja)
Inventor
松井　茂樹
大也 宮本
裕充 松田
一生 田川
彰 高木
龍一 上野
Original Assignee
Ｊｘ日鉱日石エネルギー株式会社
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Publication date
Priority claimed from JP2013142014A external-priority patent/JP6018981B2/ja
Priority claimed from JP2013142036A external-priority patent/JP6018982B2/ja
Application filed by Ｊｘ日鉱日石エネルギー株式会社 filed Critical Ｊｘ日鉱日石エネルギー株式会社
Priority to US14/413,773 priority Critical patent/US20150203782A1/en
Priority to CN201380034045.4A priority patent/CN104411811A/zh
Priority to EP13823599.9A priority patent/EP2878657B1/fr
Publication of WO2014017558A1 publication Critical patent/WO2014017558A1/fr

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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
    • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
    • C10M145/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M145/10—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
    • C10M145/12—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 monocarboxylic
    • C10M145/14—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
    • 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
    • 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
    • C10N2030/06—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
    • C10N2030/68—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
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • 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 poly (meth) acrylate viscosity index improver, and a lubricant additive and a lubricant composition containing the viscosity index improver.
  • a lubricating oil used for an internal combustion engine such as an automobile engine
  • lubricating oil for an internal combustion engine also referred to as “lubricating oil for an internal combustion engine” or “engine oil”
  • a lubricating base oil is used as one means for improving fuel efficiency.
  • a method for increasing the viscosity index of a lubricating oil by adding a viscosity index improver is known.
  • lubricating oil such as ATF, MTF, CVTF, etc.
  • driving system oil a lubricating oil
  • One method is to reduce the viscosity resistance by reducing the viscosity of the transmission lubricant.
  • the viscosity of the transmission lubricating oil is lowered, other problems such as oil leakage and seizure may occur.
  • a method using a viscosity index improver there is a method using a viscosity index improver.
  • the viscosity index of the transmission lubricant is increased by using a viscosity index improver, and the increase in the viscosity in the low temperature region is suppressed while the viscosity in the high temperature region is maintained.
  • viscosity index improver various types have been proposed so far, and in particular, the use of poly (meth) acrylate viscosity index improvers has been proposed (for example, Patent Documents 1 to 7). reference).
  • the conventional viscosity index improvers described above are intended to improve the viscosity characteristics in the high temperature region and the low temperature region by increasing the viscosity index, and are not sufficient in terms of the friction loss reduction effect.
  • an object of the present invention is to provide a viscosity index improver capable of achieving fuel economy, and a lubricating oil additive and a lubricating oil composition containing the viscosity index improver.
  • Another object of the present invention is to provide a viscosity index improver capable of sufficiently reducing the high shear viscosity at 100 ° C. while maintaining the high shear viscosity at 150 ° C., and the viscosity index improver. It is to provide a lubricating oil additive and a lubricating oil composition.
  • Another object of the present invention is to provide a viscosity index improver capable of imparting a sufficient friction loss reducing effect to a lubricant, and a lubricant additive and a lubricant composition containing the viscosity index improver. It is to provide.
  • first poly (meth) acrylate viscosity index improver sufficiently reduces the high shear viscosity at 100 ° C. while maintaining the high shear viscosity at 150 ° C.
  • the present invention has a polymer chain containing a structural unit represented by the following general formula (1), has a weight average molecular weight Mw of 100,000 or more, and a ratio between the weight average molecular weight Mw and the number average molecular weight Mn.
  • a poly (meth) acrylate viscosity index improver having Mw / Mn of 1.6 or less is provided.
  • R 1 represents hydrogen or a methyl group
  • R 2 represents an alkyl group having 1 to 36 carbon atoms.
  • first poly (meth) acrylate viscosity index improver an acrylate viscosity index improver
  • the present invention has a polymer chain containing a structural unit represented by the following general formula (1), the weight average molecular weight Mw is less than 100,000, and the ratio between the weight average molecular weight Mw and the number average molecular weight Mn.
  • a poly (meth) acrylate viscosity index improver having Mw / Mn of 1.6 or less is provided.
  • R 1 represents hydrogen or a methyl group
  • R 2 represents an alkyl group having 1 to 36 carbon atoms.
  • the present invention also provides a lubricating oil additive containing at least one selected from the first poly (meth) acrylate viscosity index improver and the second poly (meth) acrylate viscosity index improver. .
  • the present invention also includes a lubricating base oil and at least one selected from the first poly (meth) acrylate viscosity index improver and the second poly (meth) acrylate viscosity index improver.
  • a lubricating oil composition is provided.
  • a viscosity index improver capable of achieving fuel economy, and a lubricant additive and a lubricant composition containing the viscosity index improver.
  • the viscosity index improver capable of sufficiently reducing the high shear viscosity at 100 ° C. while maintaining the high shear viscosity at 150 ° C., and the viscosity index improver are contained.
  • Lubricating oil additives and lubricating oil compositions can be provided.
  • a viscosity index improver capable of reducing friction loss, and a lubricating oil additive and a lubricating oil composition containing the viscosity index improver.
  • the poly (meth) acrylate viscosity index improver has a polymer chain including a structural unit represented by the following general formula (1).
  • the poly (meth) acrylate viscosity index improver has a weight average molecular weight Mw (hereinafter, simply referred to as “Mw” in some cases) of 100,000 or more, and a weight average molecular weight Mw and a number average molecular weight Mn (hereinafter, depending on circumstances).
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • the ratio Mw / Mn (hereinafter simply referred to as “Mw / Mn”) is 1.6 or less.
  • R 1 represents hydrogen or a methyl group
  • R 2 represents an alkyl group having 1 to 36 carbon atoms.
  • R 1 may be either hydrogen or a methyl group, but is preferably a methyl group.
  • the number of carbon atoms of the alkyl group represented by R 2 is 1 to 36 as described above, and is preferably 1 to 30 and more preferably 1 to 26 from the viewpoint of handleability and ease of production. More preferably, it is 1 to 22. Further, the alkyl group represented by R 2 may be linear or branched.
  • R 1 and R 2 may be the same or different among the structural units.
  • the structural unit in which R 2 is a methyl group is based on the total amount of structural units contained in the polymer chain. Preferably, it is contained in an amount of ⁇ 45% by mass, more preferably 15-45% by mass, and still more preferably 20-45% by mass.
  • the structural unit in which R 2 is an alkyl group having 18 or more carbon atoms is contained in an amount of 10% by mass or more based on the total amount of structural units contained in the polymer chain, % Or more is more preferable, and 20% by mass or more is more preferable.
  • the polymer chain may contain only the structural unit represented by the general formula (1), or represented by the general formula (1) in addition to the structural unit represented by the general formula (1).
  • a structural unit other than the structural unit to be formed may be further included.
  • the terminal of the polymer chain is not particularly limited. Among such polymer chains, the polymer chain contains only the structural unit represented by the general formula (1) and has a terminal hydrogen atom, that is, a polymer chain represented by the following general formula (2). It is preferable.
  • R 1 represents hydrogen or a methyl group
  • R 2 represents an alkyl group having 1 to 36 carbon atoms
  • n is an integer selected so that Mw and Mw / Mn satisfy the above conditions.
  • . n is an integer of 400 to 2,000, for example.
  • the weight average molecular weight Mw is 100,000 or more, preferably 125,000 or more, more preferably 150,000 or more, and more preferably 175,000 or more from the viewpoint of fuel economy. preferable.
  • the upper limit of Mw is not particularly limited, but Mw is, for example, 500,000 or less.
  • the number average molecular weight Mn is appropriately selected so that Mw / Mn satisfies the above conditions. From the viewpoint of lowering the HTHS viscosity at 100 ° C., Mn is preferably 75,000 or more, more preferably 94,000 or more, and further preferably 110,000 or more. Although the upper limit of Mn is not particularly limited, Mn is, for example, 300,000 or less.
  • Mw / Mn is 1.6 or less, but from the viewpoint of fuel economy, it is preferably 1.5 or less, more preferably 1.4 or less, and further preferably 1.2 or less. preferable. Further, Mw / Mn is preferably 1.0 or more, more preferably 1.01 or more, and further preferably 1.02 or more, from the viewpoint of the yield of poly (meth) acrylate. .
  • weight average molecular weight Mw “number average molecular weight Mn” and “ratio Mw / Mn of weight average molecular weight Mw and number average molecular weight Mn” are Mw, Mn and Mw obtained by GPC analysis. / Mn (polystyrene (standard sample) conversion value). Specifically, for example, it is measured as follows.
  • tetrahydrofuran as a solvent and prepare a solution with a sample concentration of 2% by mass by dilution.
  • the sample solution is analyzed using a GPC apparatus (Waters Alliance 2695).
  • the analysis is carried out using a column having a solvent flow rate of 1 ml / min, an analyzable molecular weight of 10,000 to 256,000, and a refractive index as a detector.
  • the relationship between the column retention time and the molecular weight is determined using a polystyrene standard with a clear molecular weight, a calibration curve is separately prepared, and the molecular weight is determined from the obtained retention time.
  • the production method of the poly (meth) acrylate viscosity index improver according to the present embodiment is not particularly limited.
  • an initiator is added to a mixed solution containing an alkyl (meth) acrylate, a polymerization reagent, and a solvent, A method of polymerizing alkyl (meth) acrylate at a temperature is mentioned.
  • alkyl (meth) acrylate an alkyl (meth) acrylate represented by the following general formula (3) can be used.
  • R 1 represents hydrogen or a methyl group
  • R 2 represents an alkyl group having 1 to 36 carbon atoms.
  • R 1 is preferably a methyl group.
  • the alkyl group represented by R 2 preferably has 1 to 30 carbon atoms, more preferably 1 to 26 carbon atoms, and still more preferably 1 to 22 carbon atoms.
  • alkyl (meth) acrylate one of the alkyl (meth) acrylates represented by the general formula (3) can be used alone, or two or more kinds can be used in combination. Are preferably used.
  • the content of methyl (meth) acrylate in which R 2 is a methyl group is preferably 5 to 50% by mass based on the total amount of alkyl (meth) acrylate. More preferably, it is more preferably 20% to 45% by weight.
  • R 2 is alkyl (meth) acrylate is an alkyl group having 18 or more carbon atoms, an alkyl (meth) acrylate total amount of preferably 10 mass% or more and 15 mass% or more Is more preferable, and it is still more preferable that it is 20 mass% or more.
  • the polymerization reagent for example, a compound having a thiocarbonyl group such as cumyldithiobenzoic acid can be used.
  • a preferable polymerization reagent cumyldithiobenzoic acid can be exemplified.
  • solvent for example, highly refined mineral oil, anisole, and toluene can be used.
  • highly refined mineral oil can be exemplified.
  • azobisisobutyronitrile for example, azobisisobutyronitrile, azobismethylvaleronitrile, azobismethylbutylnitrile can be used.
  • azobisisobutyronitrile can be exemplified.
  • the reaction temperature for polymerizing the alkyl (meth) acrylate is preferably 70 to 120 ° C, more preferably 80 to 110 ° C, and still more preferably 90 to 100 ° C.
  • the Mw / Mn of the resulting poly (meth) acrylate viscosity index improver tends to be 1.6 or less.
  • the reaction temperature is 90 to 100 ° C.
  • the Mw / Mn tends to be 1.0 to 1.2
  • the reaction temperature is 100 to 110 ° C.
  • the Mw / Mn is 1.2 to 1.4.
  • Mw / Mn tends to be 1.4 to 1.6.
  • the reaction time depends on the reaction conditions such as the raw material alkyl (meth) acrylate, polymerization reagent, solvent and initiator, reaction temperature, and the like, and the desired poly (meth) acrylate Mw and Mw / Mn. It can be selected as appropriate. Examples of preferable reaction time include 10 to 14 hours.
  • the polymerization of the alkyl (meth) acrylate is preferably performed in a nitrogen atmosphere.
  • the lubricating oil additive according to the second embodiment of the present invention has a polymer chain containing the structural unit represented by the general formula (1), has a weight average molecular weight Mw of 100,000 or more, and a weight average molecular weight.
  • a poly (meth) acrylate viscosity index improver having a ratio Mw / Mn of Mw to number average molecular weight Mn of 1.6 or less is contained.
  • the poly (meth) acrylate-based viscosity index improver in the present embodiment is the same as the viscosity index improver in the first embodiment, and a duplicate description is omitted here.
  • the lubricating oil additive may consist only of the above poly (meth) acrylate viscosity index improver, or a mixture of the viscosity index improver and other additives (ie, additive composition). It may be.
  • the lubricating oil additive is a mixture of the viscosity index improver and other additives, the mixing ratio is not particularly limited and can be appropriately selected according to the application.
  • additives include viscosity index improvers other than the above poly (meth) acrylate viscosity index improvers, antioxidants, antiwear agents (or extreme pressure agents), corrosion inhibitors, rust inhibitors, viscosity indexes Examples thereof include additives such as improvers, pour point depressants, demulsifiers, metal deactivators, antifoaming agents, and ashless friction modifiers. These additives can be used individually by 1 type or in combination of 2 or more types.
  • poly (meth) acrylate viscosity index improver other than the above poly (meth) acrylate viscosity index improver
  • polyisobutene viscosity index improver examples thereof include an improver, an ethylene-propylene copolymer viscosity index improver, and a styrene-butadiene hydrogenated copolymer viscosity index improver.
  • antioxidants examples include ashless antioxidants such as phenols and amines, and metal antioxidants such as zinc, copper, and molybdenum.
  • phenolic antioxidants examples include 4,4′-methylenebis (2,6-di-tert-butylphenol), 4,4′-bis (2,6-di-tert-butylphenol), 4,4 ′.
  • amine antioxidants include known amine antioxidants that are generally used for lubricating oils such as aromatic amine compounds, alkyldiphenylamines, alkylnaphthylamines, phenyl- ⁇ -naphthylamines, alkylphenyl- ⁇ -naphthylamines, and the like. Agents.
  • corrosion inhibitor examples include benzotriazole, tolyltriazole, thiadiazole, or imidazole compounds.
  • rust preventive agent examples include petroleum sulfonate, alkylbenzene sulfonate, dinonylnaphthalene sulfonate, alkenyl succinic acid ester, and polyhydric alcohol ester.
  • metal deactivator examples include imidazoline, pyrimidine derivatives, alkylthiadiazole, mercaptobenzothiazole, benzotriazole or derivatives thereof, 1,3,4-thiadiazole polysulfide, 1,3,4-thiadiazolyl-2,5-bis.
  • metal deactivator examples include dialkyldithiocarbamate, 2- (alkyldithio) benzimidazole, and ⁇ - (o-carboxybenzylthio) propiononitrile.
  • antifoaming agents examples include silicone oils having a kinematic viscosity at 25 ° C. of 1,000 to 100,000 mm 2 / s, alkenyl succinic acid derivatives, esters of polyhydroxy aliphatic alcohols and long-chain fatty acids, and methyl salicylates. o-hydroxybenzyl alcohol and the like.
  • any compound usually used as an ashless friction modifier for lubricating oils can be used.
  • ashless friction modifiers such as amine compounds, fatty acid esters, fatty acid amides, fatty acids, aliphatic alcohols and aliphatic ethers having at least one linear alkyl group or linear alkenyl group in the molecule.
  • Various ashless friction modifiers exemplified in International Publication No. 2005/037967 such as nitrogen-containing compounds and acid-modified derivatives thereof described in JP-A-2009-286831, can also be used.
  • the lubricating oil additive according to this embodiment may further contain a solvent.
  • a solvent highly refined mineral oil, anisole, and toluene can be used. Among these, it is preferable to use highly refined mineral oil.
  • the content of the solvent is preferably 5 to 75% by mass, more preferably 30 to 60%, based on the total amount of the lubricating oil additive, from the viewpoint of handling as an additive. % By mass.
  • the lubricating oil composition according to the third embodiment has a lubricating base oil and a polymer chain containing the structural unit represented by the general formula (1), and has a weight average molecular weight Mw of 100,000 or more, And a poly (meth) acrylate viscosity index improver having a ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn of 1.6 or less.
  • the lubricating oil composition according to the present embodiment includes a mode including the lubricating base oil and the lubricating oil additive according to the second embodiment.
  • the poly (meth) acrylate-based viscosity index improver in the present embodiment is the same as the poly (meth) acrylate-based viscosity index improver in the first embodiment and the second embodiment, and is included in the lubricating oil composition.
  • Other additives and solvents to be obtained are the same as the other additives and solvents in the second embodiment, and redundant description is omitted here.
  • the lubricating base oil is not particularly limited, and a lubricating base oil used for ordinary lubricating oil can be used. Specifically, a mineral oil base oil, a synthetic oil base oil, or a mixture of two or more kinds of lubricant base oils selected from these can be used.
  • mineral oil base oils include, for example, solvent oil removal, solvent extraction, hydrocracking, solvent removal of lubricating oil fractions obtained by distillation under reduced pressure of atmospheric residual oil obtained by atmospheric distillation of crude oil.
  • examples thereof include those refined by performing one or more treatments such as dewaxing and hydrorefining, or base oils produced by a method of isomerizing wax isomerized mineral oil or GTL wax (gas-tuly wax).
  • Synthetic oil-based lubricating oils include, for example, polybutene or hydrides thereof; poly- ⁇ -olefins such as 1-octene oligomers and 1-decene oligomers or hydrides thereof; ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl Diesters such as adipate, ditridecyl adipate, di-2-ethylhexyl sebacate; polyol esters such as trimethylolpropane caprylate, trimethylolpropane pelargonate, pentaerythritol-2-ethylhexanoate, pentaerythritol pelargonate; alkylnaphthalene And aromatic synthetic oils such as alkylbenzene or mixtures thereof.
  • the kinematic viscosity of the lubricating base oil at 100 ° C. is preferably 2.5 to 10.0 mm 2 / s, more preferably 3.0 to 8.0 mm 2 / s, still more preferably 3.5 to 6.0 mm 2. / S.
  • the viscosity index of the lubricating base oil is preferably 90 to 165, more preferably 100 to 155, and still more preferably 120 to 150.
  • the saturated content of the lubricating base oil by chromatographic analysis is preferably 80% or more, more preferably, in order to facilitate the effects of additives such as the poly (meth) acrylate viscosity index improver according to the first embodiment. 85% or more, more preferably 90% or more, and most preferably 95% or more.
  • the content of the poly (meth) acrylate viscosity index improver according to the first embodiment is preferably 0.1 to 20.0% by mass, more preferably 0.5 to 15 based on the total amount of the lubricating oil composition. 0.0 mass%, more preferably 1.0 to 10.0 mass%.
  • the content is equal to or higher than the lower limit value, it is easy to obtain a sufficient addition effect.
  • the content is equal to or lower than the upper limit value, shear stability is increased and fuel consumption sustainability is improved.
  • the kinematic viscosity at 100 ° C. of the lubricating oil composition is preferably 3.0 to 16.3 mm 2 / s, more preferably 3.5 to 12.5 mm 2 / s, and still more preferably 4.0 to 9.3 mm 2. / S.
  • the kinematic viscosity at 100 ° C. in the present invention means the kinematic viscosity at 100 ° C. defined in JIS K-2283-1993.
  • the viscosity index of the lubricating oil composition is preferably 150 to 250, more preferably 160 to 240, and still more preferably 170 to 230.
  • the viscosity index is equal to or higher than the lower limit, fuel economy can be further improved while maintaining the HTHS viscosity, and the low temperature viscosity is easily lowered.
  • the viscosity index is less than or equal to the above upper limit, low temperature fluidity, solubility of additives, and compatibility with sealing materials can be ensured.
  • the viscosity index in the present invention means a viscosity index defined in JIS K 2283-1993.
  • the HTHS viscosity at 150 ° C. of the lubricating oil composition is preferably 1.7 mPa ⁇ s or more, more preferably 2.0 mPa ⁇ s or more, still more preferably 2.3 mPa ⁇ s or more, and most preferably 2.6 mPa ⁇ s or more. It is.
  • the HTHS viscosity at 150 ° C. is equal to or higher than the lower limit, evaporation of the lubricating oil composition can be suppressed, and lubricity can be ensured.
  • the HTHS viscosity at 100 ° C. is not more than the above upper limit value, higher fuel economy can be obtained.
  • the HTHS viscosity at 150 ° C. or 100 ° C. means the high temperature high shear viscosity at 150 ° C. or 100 ° C. as defined in ASTM D-4683.
  • the viscosity index improver according to the first embodiment described above, the lubricating oil additive according to the second embodiment, and the lubricating oil composition according to the third embodiment include a lubricating oil for an internal combustion engine, a drive system lubricating oil, and the like. Although it can be used in a wide range of fields, it is particularly useful in the field of lubricating oils for internal combustion engines.
  • the fuel of the internal combustion engine may be either gasoline or diesel fuel.
  • the poly (meth) acrylate viscosity index improver according to the fourth embodiment has a polymer chain including a structural unit represented by the following general formula (1).
  • the poly (meth) acrylate viscosity index improver has a weight average molecular weight Mw (hereinafter, simply referred to as “Mw” in some cases) of less than 100,000, and a weight average molecular weight Mw and a number average molecular weight Mn (hereinafter, depending on circumstances).
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • the ratio Mw / Mn (hereinafter simply referred to as “Mw / Mn”) is 1.6 or less.
  • R 1 represents hydrogen or a methyl group
  • R 2 represents an alkyl group having 1 to 36 carbon atoms.
  • R 1 may be either hydrogen or a methyl group, but is preferably a methyl group.
  • the number of carbon atoms of the alkyl group represented by R 2 is 1 to 36 as described above, and is preferably 1 to 30 and more preferably 1 to 26 from the viewpoint of handleability and ease of production. More preferably, it is 1 to 22. Further, the alkyl group represented by R 2 may be linear or branched.
  • R 1 and R 2 may be the same or different among the structural units. May comprise two or more structural units having different R 2, from the viewpoint of the viscosity-temperature characteristic, structural units R 2 is a methyl group, based on the total amount of structural units contained in the polymer chain, 10 to 45 weight %, Preferably 15 to 45% by mass, more preferably 20 to 45% by mass.
  • the structural unit in which R 2 is an alkyl group having 18 or more carbon atoms is contained in an amount of 10% by mass or more based on the total amount of structural units contained in the polymer chain, % Or more is more preferable, and 20% by mass or more is more preferable.
  • the polymer chain may contain only the structural unit represented by the general formula (1), or represented by the general formula (1) in addition to the structural unit represented by the general formula (1).
  • a structural unit other than the structural unit to be formed may be further included.
  • the terminal of the polymer chain is not particularly limited. Among such polymer chains, the polymer chain contains only the structural unit represented by the general formula (1) and has a terminal hydrogen atom, that is, a polymer chain represented by the following general formula (2). It is preferable.
  • R 1 represents hydrogen or a methyl group
  • R 2 represents an alkyl group having 1 to 36 carbon atoms
  • n is an integer selected so that Mw and Mw / Mn satisfy the above conditions.
  • . n is an integer of 40 to 450, for example.
  • the weight average molecular weight Mw is less than 100,000, and is preferably 80,000 or less, more preferably 70,000 or less, and further preferably 60,000 or less from the viewpoint of fuel saving characteristics. preferable.
  • the lower limit of Mw is not particularly limited, but Mw is, for example, 10,000 or more.
  • the number average molecular weight Mn is appropriately selected so that Mw / Mn satisfies the above conditions.
  • Mn is preferably 6,000 or more, more preferably 10,000 or more, and further preferably 12,500 or more, from the viewpoint of fuel saving characteristics.
  • the upper limit of Mn is not particularly limited, but Mn is, for example, 60,000 or less.
  • Mw / Mn is 1.6 or less, but from the viewpoint of fuel economy, it is preferably 1.5 or less, more preferably 1.4 or less, and further preferably 1.3 or less. preferable. Further, Mw / Mn is preferably 1.0 or more, more preferably 1.01 or more, and further preferably 1.02 or more, from the viewpoint of fuel economy.
  • weight average molecular weight Mw “number average molecular weight Mn” and “ratio Mw / Mn of weight average molecular weight Mw and number average molecular weight Mn” are Mw, Mn and Mw obtained by GPC analysis. / Mn (polystyrene (standard sample) conversion value). Specifically, for example, it is measured as follows.
  • tetrahydrofuran as a solvent and prepare a solution with a sample concentration of 2% by mass by dilution.
  • the sample solution is analyzed using a GPC apparatus (Waters Alliance 2695).
  • the analysis is carried out using a column having a solvent flow rate of 1 ml / min, an analyzable molecular weight of 10,000 to 256,000, and a refractive index as a detector.
  • the relationship between the column retention time and the molecular weight is determined using a polystyrene standard with a clear molecular weight, a calibration curve is separately prepared, and the molecular weight is determined from the obtained retention time.
  • the production method of the poly (meth) acrylate viscosity index improver according to the present embodiment is not particularly limited.
  • an initiator is added to a mixed solution containing an alkyl (meth) acrylate, a polymerization reagent, and a solvent, A method of polymerizing alkyl (meth) acrylate at a temperature is mentioned.
  • alkyl (meth) acrylate an alkyl (meth) acrylate represented by the following general formula (3) can be used.
  • R 1 represents hydrogen or a methyl group
  • R 2 represents an alkyl group having 1 to 36 carbon atoms.
  • R 1 is preferably a methyl group.
  • the alkyl group represented by R 2 preferably has 1 to 36 carbon atoms, more preferably 1 to 30 carbon atoms, and still more preferably 1 to 22 carbon atoms.
  • alkyl (meth) acrylate one of the alkyl (meth) acrylates represented by the general formula (3) can be used alone, or two or more kinds can be used in combination. Are preferably used.
  • the content of methyl (meth) acrylate in which R 2 is a methyl group is preferably 5 to 50% by mass based on the total amount of alkyl (meth) acrylate. More preferably, it is more preferably 20% to 45% by weight.
  • R 2 is alkyl (meth) acrylate is an alkyl group having 18 or more carbon atoms, an alkyl (meth) acrylate total amount of preferably 10 mass% or more and 15 mass% or more Is more preferable, and it is still more preferable that it is 20 mass% or more.
  • the polymerization reagent for example, cumyldithiobenzoic acid or a substance containing a thiocarbonyl group can be used.
  • cumyldithiobenzoic acid can be exemplified.
  • solvent for example, highly refined mineral oil, anisole, and toluene can be used.
  • highly refined mineral oil can be exemplified.
  • azobisisobutyronitrile for example, azobisisobutyronitrile, azobisdimethylvaleronitrile, azobismethylbutylnitrile can be used.
  • azobisisobutyronitrile can be exemplified.
  • the reaction temperature for polymerizing the alkyl (meth) acrylate is preferably 70 to 120 ° C., more preferably 80 to 110 ° C., and still more preferably 80 to 120 ° C.
  • the Mw / Mn of the resulting poly (meth) acrylate viscosity index improver tends to be 1.6 or less.
  • the reaction temperature is 90 to 100 ° C.
  • the Mw / Mn tends to be 1.0 to 1.2
  • the reaction temperature is 100 to 110 ° C.
  • the Mw / Mn is 1.2 to 1.4.
  • Mw / Mn tends to be 1.4 to 1.6.
  • the reaction time depends on the reaction conditions such as the raw material alkyl (meth) acrylate, polymerization reagent, solvent and initiator, reaction temperature, and the like, and the desired poly (meth) acrylate Mw and Mw / Mn. It can be selected as appropriate. Examples of preferable reaction time include 10 to 14 hours.
  • the polymerization of the alkyl (meth) acrylate is preferably performed in a nitrogen atmosphere.
  • the lubricating oil additive according to the fifth embodiment of the present invention has a polymer chain containing the structural unit represented by the general formula (1), has a weight average molecular weight Mw of less than 100,000, and a weight average molecular weight.
  • a poly (meth) acrylate viscosity index improver having a ratio Mw / Mn of Mw to number average molecular weight Mn of 1.6 or less is contained.
  • the poly (meth) acrylate-based viscosity index improver in the present embodiment is the same as the viscosity index improver in the fourth embodiment, and a duplicate description is omitted here.
  • the lubricating oil additive may consist only of the above poly (meth) acrylate viscosity index improver, or a mixture of the viscosity index improver and other additives (ie, additive composition). It may be.
  • the lubricating oil additive is a mixture of the viscosity index improver and other additives, the mixing ratio is not particularly limited and can be appropriately selected according to the application.
  • the other additive is the same as the other additive in the second embodiment, and a duplicate description is omitted here.
  • the lubricating oil additive according to this embodiment may further contain a solvent.
  • a solvent highly refined mineral oil, solvent refined mineral oil, and synthetic oil can be used. Among these, it is preferable to use highly refined mineral oil.
  • the content of the solvent is preferably 5 to 75% by mass, more preferably 30 to 60% by mass, based on the total amount of the lubricating oil additive.
  • the lubricating oil composition according to the sixth embodiment has a lubricating oil base oil and a polymer chain containing the structural unit represented by the general formula (1), and the weight average molecular weight Mw is less than 100,000, And a poly (meth) acrylate viscosity index improver having a ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn of 1.6 or less.
  • the lubricating oil composition according to the present embodiment includes a mode containing the lubricating base oil and the lubricating oil additive according to the fifth embodiment.
  • the poly (meth) acrylate-based viscosity index improver in the present embodiment is the same as the poly (meth) acrylate-based viscosity index improver in the fourth and fifth embodiments, and is included in the lubricating oil composition.
  • Other additives and solvents to be obtained are the same as the other additives and solvents in the fifth embodiment, and redundant description is omitted here.
  • Lubricating oil base oil is the same as the lubricating oil base oil in the third embodiment, and redundant description is omitted here.
  • the content of the poly (meth) acrylate viscosity index improver according to the fourth embodiment is preferably 0.1 to 20.0 mass%, more preferably 0.5 to 15 based on the total amount of the lubricating oil composition. 0.0 mass%, more preferably 1.0 to 10.0 mass%.
  • the content is equal to or higher than the lower limit value, it is easy to obtain a sufficient addition effect.
  • the content is equal to or lower than the upper limit value, shear stability is increased and fuel consumption sustainability is improved.
  • the kinematic viscosity at 100 ° C. of the lubricating oil composition is preferably 2.0 to 16.3 mm 2 / s, more preferably 2.5 to 12.5 mm 2 / s, still more preferably 3.0 to 10.0 mm 2. / S.
  • the kinematic viscosity at 100 ° C. in the present invention means the kinematic viscosity at 100 ° C. defined in JIS K-2283-1993.
  • the viscosity index of the lubricating oil composition is preferably 130 to 250, more preferably 140 to 240, and still more preferably 160 to 230.
  • the viscosity index is equal to or higher than the lower limit, fuel economy can be further improved while maintaining the HTHS viscosity, and the low temperature viscosity is easily lowered.
  • the viscosity index is less than or equal to the above upper limit, low temperature fluidity, solubility of additives, and compatibility with sealing materials can be ensured.
  • the viscosity index in the present invention means a viscosity index defined in JIS K 2283-1993.
  • the viscosity index improver according to the fourth embodiment described above, the lubricating oil additive according to the fifth embodiment, and the lubricating oil composition according to the sixth embodiment include a lubricating oil for an internal combustion engine, a drive system lubricating oil, and the like. Although it can be used in a wide range of fields, it is particularly useful in the field of drive system lubricants.
  • the driving device in this case may be any of an automatic transmission (AT), a continuously variable automatic transmission (CVT), and a stepped transmission (TM).
  • Example 1-1 A poly (meth) acrylate viscosity index improver was synthesized under the following conditions (referred to as “synthesis condition 1-1”).
  • a 300 ml five-neck separable flask equipped with a vertical metal stirring blade (with vacuum seal), a Dimroth cooler, a three-way cock for introducing nitrogen and a sample inlet was charged with methyl methacrylate (R 1 in formula (3) and Compound in which R 2 is both a methyl group (hereinafter referred to as “C1-MA”) 12 g, stearyl methacrylate (in formula (3), R 1 is a methyl group, R 2 is a stearyl group (straight chain of 18 carbon atoms) A compound which is an alkyl group), hereinafter referred to as “C18-MA”.) 18 g, cumyldithiobenzoic acid (CDTBA) 0.030 g, and highly purified mineral oil 30 g as a solvent were added to obtain a homogeneous solution under stirring.
  • CDTBA cumyldithiobenzoic acid
  • This solution was cooled to 0 ° C. in an ice bath, and vacuum degassing / nitrogen purging of the reaction system was performed 5 times using a diaphragm pump. Furthermore, 0.052 g of azobisisobutyronitrile (AIBN) was added as a radical initiator from the sample inlet under a nitrogen flow, and then polymerization was performed at a solution temperature of 110 ° C. for 12 hours in a nitrogen atmosphere. A solution containing a (meth) acrylate viscosity index improver was obtained.
  • AIBN azobisisobutyronitrile
  • the weight average molecular weight Mw and the number average molecular weight Mn were measured by GPC analysis. As a result, the weight average molecular weight Mw was 230,000, the number average molecular weight Mn was 152,000, and Mw / Mn was 1.51.
  • the procedure of GPC analysis is as follows.
  • Tetrahydrofuran was used as a solvent and diluted to prepare a solution having a sample concentration of 2% by mass.
  • the sample solution was analyzed using a GPC apparatus (Waters Alliance 2695). The analysis was carried out using a column with a solvent flow rate of 1 ml / min and an analyzable molecular weight of 10,000 to 256,000 and using the refractive index as a detector. The relationship between the column retention time and the molecular weight was determined using a polystyrene standard with a clear molecular weight, a calibration curve was prepared separately, and the molecular weight was determined from the obtained retention time.
  • Example 1-2 A poly (meth) acrylate viscosity index improver was synthesized under the following conditions (referred to as “synthesis condition 1-2”).
  • C1-MA methyl methacrylate
  • C18 -MA stearyl methacrylate
  • CDTBA cumyldithiobenzoic acid
  • highly purified mineral oil 30 g as a solvent were added to obtain a homogeneous solution under stirring.
  • AIBN azobisisobutyronitrile
  • the obtained poly (meth) acrylate viscosity index improver was subjected to GPC analysis in the same manner as in Example 1-1.
  • the weight average molecular weight Mw was 220,000
  • the number average molecular weight Mn was 167,000
  • Mw / Mn was 1.32.
  • Example 1-3 A poly (meth) acrylate viscosity index improver was synthesized under the following conditions (referred to as “synthesis conditions 1-3”).
  • C1-MA methyl methacrylate
  • C18-MA stearyl methacrylate
  • CDTBA cumyldithiobenzoic acid
  • the obtained poly (meth) acrylate viscosity index improver was subjected to GPC analysis in the same manner as in Example 1-1.
  • the weight average molecular weight Mw was 210,000
  • the number average molecular weight Mn was 186,000
  • Mw / Mn was 1.13.
  • a 300 ml four-necked reaction flask equipped with a stirring blade (with vacuum seal), a Dimroth cooler, a three-way cock for introducing nitrogen, and a dropping funnel for introducing sample was charged with 30 g of highly purified mineral oil as a solvent, and an oil at 85 ° C. The mixture was stirred for 1 hour while purging with nitrogen in the bath.
  • a raw material in which 12 g of methyl methacrylate (C1-MA) and 18 g of stearyl methacrylate (C18-MA) are mixed as raw materials and 0.12 g of azobisisobutyronitrile (AIBN) as a radical initiator is added.
  • This raw material was dropped into the reaction flask over 70 minutes. Thereafter, polymerization was carried out for 8 hours while maintaining stirring at 85 ° C. under a nitrogen flow to obtain a solution containing a poly (meth) acrylate viscosity index improver. Thereafter, vacuum distillation was performed at 130 ° C. and 1 mmHg for 3 hours to remove unreacted monomers from the solution.
  • the obtained poly (meth) acrylate viscosity index improver was subjected to GPC analysis in the same manner as in Example 1-1.
  • the weight average molecular weight Mw was 260,000
  • the number average molecular weight Mn was 158,000
  • Mw / Mn was 1.65.
  • Examples 1-4 to 1-15, Comparative Examples 1-2 to 1-4] The blending amount of the raw materials was changed as shown in Tables 1, 3, 5, and 7, and the poly (meth) acrylate viscosity index was improved in the same manner as in any of the above synthesis conditions 1-1 to 1-4.
  • the agent was synthesized.
  • C12-MA is a compound in which R 1 in the formula (3) is a methyl group and R 2 is a dodecyl group (a linear alkyl group having 12 carbon atoms)
  • C22-MA is a compound in the formula (3)
  • R 1 in the middle represents a methyl group
  • R 2 represents a docosanyl group (a linear alkyl group having 22 carbon atoms).
  • Tables 2, 4, 6, and 8 show Mw, Mn, and Mw / Mn of the obtained poly (meth) acrylate viscosity index improvers.
  • Example 2-1 A poly (meth) acrylate viscosity index improver was synthesized under the following conditions (referred to as “synthesis condition 2-1”).
  • a 300 ml five-neck separable flask equipped with a vertical metal stirring blade (with vacuum seal), a Dimroth cooler, a three-way cock for introducing nitrogen and a sample inlet was charged with methyl methacrylate (R 1 in formula (3) and Compound in which R 2 is both a methyl group (hereinafter referred to as “C1-MA”) 12 g, stearyl methacrylate (in formula (3), R 1 is a methyl group, R 2 is a stearyl group (straight chain of 18 carbon atoms) A compound that is an alkyl group), hereinafter referred to as “C18-MA”.) 18 g, cumyldithiobenzoic acid (CDTBA) 0.081 g, and 30 g of highly purified mineral oil as a solvent were added to obtain a homogeneous solution under stirring.
  • CDTBA cumyldithiobenzoic acid
  • This solution was cooled to 0 ° C. in an ice bath, and vacuum degassing / nitrogen purging of the reaction system was performed 5 times using a diaphragm pump. Furthermore, 0.014 g of azobisisobutyronitrile (AIBN) was added as a radical initiator from the sample inlet under a nitrogen flow, and then polymerization was carried out at a solution temperature of 110 ° C. for 12 hours in a nitrogen atmosphere. A solution containing a (meth) acrylate viscosity index improver was obtained.
  • AIBN azobisisobutyronitrile
  • the weight average molecular weight Mw and the number average molecular weight Mn were measured by GPC analysis. As a result, the weight average molecular weight Mw was 83,000, the number average molecular weight Mn was 55,000, and Mw / Mn was 1.51.
  • the procedure of GPC analysis is as follows.
  • Tetrahydrofuran was used as a solvent and diluted to prepare a solution having a sample concentration of 2% by mass.
  • the sample solution was analyzed using a GPC apparatus (Waters Alliance 2695). The analysis was carried out using a column with a solvent flow rate of 1 ml / min and an analyzable molecular weight of 10,000 to 256,000 and using the refractive index as a detector. The relationship between the column retention time and the molecular weight was determined using a polystyrene standard with a clear molecular weight, a calibration curve was prepared separately, and the molecular weight was determined from the obtained retention time. The molecular weight of the arm (Mw and Mn) can be calculated by dividing the obtained molecular weight (Mw and Mn) by the number of functional groups of the initiator.
  • Example 2-2 A poly (meth) acrylate viscosity index improver was synthesized under the following conditions (referred to as “synthesis condition 2-2”).
  • C1-MA methyl methacrylate
  • C18 -MA stearyl methacrylate
  • CDTBA cumyldithiobenzoic acid
  • AIBN azobisisobutyronitrile
  • the obtained poly (meth) acrylate viscosity index improver was subjected to GPC analysis in the same manner as in Example 2-1.
  • the weight average molecular weight Mw was 78,000
  • the number average molecular weight Mn was 59,000
  • Mw / Mn was 1.32.
  • Example 2-3 A poly (meth) acrylate viscosity index improver was synthesized under the following conditions (referred to as “synthesis conditions 2-3”).
  • C1-MA methyl methacrylate
  • C18-MA stearyl methacrylate
  • CDTBA cumyldithiobenzoic acid
  • the obtained poly (meth) acrylate viscosity index improver was subjected to GPC analysis in the same manner as in Example 2-1.
  • the weight average molecular weight Mw was 85,000
  • the number average molecular weight Mn was 75,000
  • Mw / Mn was 1.13.
  • a 300 ml four-necked reaction flask equipped with a stirring blade (with vacuum seal), a Dimroth cooler, a three-way cock for introducing nitrogen, and a dropping funnel for introducing sample was charged with 30 g of highly purified mineral oil as a solvent, and an oil at 85 ° C. The mixture was stirred for 1 hour while purging with nitrogen in the bath.
  • a raw material in which 12 g of methyl methacrylate (C1-MA) and 18 g of stearyl methacrylate (C18-MA) are mixed as raw materials and 0.068 g of azobisisobutyronitrile (AIBN) as a radical initiator is added.
  • This raw material was dropped into the reaction flask over 70 minutes. Thereafter, polymerization was carried out for 8 hours while maintaining stirring at 85 ° C. under a nitrogen flow to obtain a solution containing a poly (meth) acrylate viscosity index improver. Thereafter, vacuum distillation was performed at 130 ° C. and 1 mmHg for 3 hours to remove unreacted monomers from the solution.
  • the obtained poly (meth) acrylate viscosity index improver was subjected to GPC analysis in the same manner as in Example 2-1.
  • the weight average molecular weight Mw was 18,000
  • the number average molecular weight Mn was 11,000
  • Mw / Mn was 1.65.
  • Examples 2-4 to 2-14, Comparative Examples 2-2 to 2-5 The blending amount of the raw materials was changed as shown in Tables 9, 11, 13 and 15, and other than that, the same as any of the above synthesis conditions 2-1 to 2-4, the poly (meth) acrylate viscosity index was improved
  • the agent was synthesized.
  • C12-MA is a compound in which R 1 in the formula (3) is a methyl group and R 2 is a dodecyl group (a linear alkyl group having 12 carbon atoms)
  • C22-MA is a compound in the formula (3)
  • R 1 in the middle represents a methyl group
  • R 2 represents a docosanyl group (a linear alkyl group having 22 carbon atoms).
  • Tables 2, 4, 6, and 8 show Mw, Mn, and Mw / Mn of the obtained poly (meth) acrylate viscosity index improvers.
  • ⁇ Preparation of lubricating oil composition A poly (meth) acrylate viscosity index improver obtained in Examples 2-1 to 2-14 and Comparative Examples 2-1 to 2-5, and a metal (TBN 300 mg KOH / g calcium sulfonate) detergent, Ashless residue (succinimide), friction modifier (oleylamide), antiwear agent (phosphoric acid), antioxidant (diphenylamine), metal deactivator (thiadiazole), and sulfur-based additive (sulfurized ester) ) And highly refined mineral oil (Group II base oil, kinematic viscosity at 100 ° C .: 3.3 mm 2 / s, VI: 110) in the proportions shown in Tables 10, 12, 14, and 16. A lubricating oil composition was prepared.
  • the friction characteristics of the lubricating oil compositions of Examples 2-1 to 2-14 and Comparative Examples 2-1 to 2-5 were measured using a two-cylinder rolling sliding friction tester. Evaluated by coefficient. Specifically, the friction coefficient for 10 minutes from the start of the test was averaged under the conditions of a test temperature of 80 ° C., a load of 142 N, a surface pressure of 0.48 GPa, a peripheral speed of 1.0 m / s, and a slip ratio of 5.1%. The results are shown in Tables 10, 12, 14, and 16.

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Abstract

Cette invention concerne un améliorant d'indice de viscosité à base de poly(méth)acrylate ayant une chaîne polymère qui contient un motif structural représenté par la formule générale (1), un poids moléculaire moyen en poids (Mw) d'au moins 100 000 et un rapport (Mw/Mn) du poids moléculaire moyen en poids (Mw) au poids moléculaire moyen en nombre (Mn) d'au plus 1,6. [Dans la formule (1), R1 représente un atome d'hydrogène ou un groupe méthyle et R2 représente un groupe alkyle C1-36].
PCT/JP2013/070100 2012-07-24 2013-07-24 Améliorant d'indice de viscosité à base de poly(méth)acrylate, et composition d'huile lubrifiante et additif pour huile lubrifiante le contenant WO2014017558A1 (fr)

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CN104411811A (zh) 2015-03-11
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US20150203782A1 (en) 2015-07-23
EP2878657B1 (fr) 2018-06-13

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