Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
  • C10M169/06—Mixtures of thickeners and additives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • 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
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen 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
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/102—Aliphatic fractions
  • C10M2203/1025—Aliphatic fractions used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/003—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
  • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
  • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
  • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/10—Carboxylix acids; Neutral salts thereof
  • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
  • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
  • C10M2207/123—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms polycarboxylic
• • 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
  • C10M2207/10—Carboxylix acids; Neutral salts thereof
  • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
  • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
  • C10M2207/127—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids polycarboxylic
• • 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
  • C10M2207/287—Partial esters
  • C10M2207/289—Partial esters containing free hydroxy 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
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
  • C10M2215/10—Amides of carbonic or haloformic acids
  • C10M2215/102—Ureas; Semicarbazides; Allophanates
  • C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening 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
  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
  • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
• • 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
  • C10N2020/011—Cloud point
• • 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
  • 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
  • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/02—Bearings
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/14—Electric or magnetic purposes
• • 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
  • C10N2040/40—Generators or electric motors in oil or gas winning field
• • 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
  • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
  • C10N2050/10—Form in which the lubricant is applied to the material being lubricated semi-solid; greasy

Definitions

• the present invention relates to a grease composition used for rolling bearings of the automotive electrical equipment and automotive auxiliaries.
• diurea based greases For the rolling bearings of the automotive electrical equipment and automotive auxiliaries, diurea based greases have been widely used, especially from the viewpoint of the heat resistance. In the diurea based greases, aromatic diurea compounds are frequently used on the grounds of their durability under high temperatures.
• the aromatic diurea compounds should be added in larger amounts than other diurea compounds to render the same hardness to a resultant grease composition.
• the resistance to stirring of the resultant grease becomes too high to satisfy low torque performance.
• JP 6-17079 A proposes a grease composition characterized by comprising a base oil which contains an ether type synthetic oil in an amount of more than 50 mass%; and at least one diurea compound represented by the following general formula as a gelling agent of one essential component: R 2 -NHCONH-R 1 -NHCONH-R 3 wherein R 1 is a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms; and R 2 and R 3 , which may be the same or different represent cyclohexyl group, a cyclohexyl-derived group having 7 to 12 carbon atoms, or an alkyl group having 8 to 20 carbon atoms, with the content of cyclohexyl group or the derived groups thereof, as expressed by formula: [((the number of the cyclohexyl groups or the derived groups thereof) / (the number of the cyclohexyl groups or the derived
• the phenyl ether oil used as the base oil has a pour point of about -30°C, so that the low temperature properties are not so satisfactory. This will increase the torque at low temperatures.
• JP 2008-239706 A proposes a grease composition characterized by comprising a base oil which contains an ester type synthetic oil; and a thickener represented by the following general formula as one essential component: R 1 -NHCONH-R 2 -NHCONH-R 3 wherein R 2 is a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms; and R 1 and R 3 , which may be the same or different represent cyclohexyl group or an alkyl group having 8 to 22 carbon atoms, with the content of cyclohexyl group, as expressed by formula: [((the number of the cyclohexyl groups) / (the number of the cyclohexyl groups + the number of the alkyl groups)) x 100] being 60 to 95%.
• the ester type synthetic oil is subjected to hydrolysis when water penetrates from the outside and is mixed in, whereby the resultant acid component will unfavorably involve a risk of rust development.
• An object of the invention is to provide a low torque grease composition having excellent rust preventing properties.
• the low torque performance can be ensured under the circumstances of low temperature by using a low pour point synthetic hydrocarbon oil in an amount of 30 mass% or more of the base oil.
• a low pour point synthetic hydrocarbon oil in an amount of 30 mass% or more of the base oil.
• an aliphatic diurea is used alone or in combination with an alicyclic diurea to obtain a grease composition having a proper hardness even though the total amount of thickener is decreased.
• the inventors of the invention have thus solved the above-mentioned problems by choosing and combining a particular base oil, a thickener and a rust inhibitor. Namely, the invention provides the following grease composition:
• the grease composition of the invention can exhibit low torque performance within a wide temperature range, thereby improving fuel economy to contribute to reduction of CO 2 .
• the grease composition of the invention also shows excellent rust preventing properties. Further, the resistance to evaporation of the grease composition according to the invention is also excellent.
• the base oil used in the invention comprises a synthetic hydrocarbon oil and a highly purified mineral oil with a pour point of -35°C or less.
• the ratio by mass of the synthetic hydrocarbon oil to the highly purified mineral oil with a pour point of -35°C or less is 100:0 to 30:70.
• the content of the synthetic hydrocarbon oil in the base oil is 30 mass% or more, the low torque performance can be satisfied.
• Examples of the synthetic hydrocarbon oil include poly- ⁇ -olefin, polybutene, ethylene- ⁇ -olefin oligomer and the like. Particularly, poly- ⁇ -olefin is preferred.
• the highly purified mineral oil used in the invention is referred to as a mineral oil provided with a pour point lower than the pour points (about -5 to -20°C) of unpurified mineral oils by carrying out a dewaxing step to control the wax components from precipitating at low temperatures.
• the highly purified mineral oil with a pour point of -35°C or less can be used without any adverse effect on the low torque performance at low temperatures and any problem in the resistance to evaporation.
• the base oil may preferably have a kinematic viscosity at 40°C of 80 to 150 mm 2 /s, more preferably 85 to 140 mm 2 /s, and most preferably 90 to 130 mm 2 /s.
• the kinematic viscosity at 40°C of the base oil exceeds 150 mm 2 /s, the grease viscosity becomes too high to satisfy the low torque performance.
• the kinematic viscosity at 40°C of the base oil is less than 80 mm 2 /s, the resistance to evaporation will unfavorably be lowered although the requirement of low torque performance can be satisfied.
• the synthetic hydrocarbon oil may comprise the one having a kinematic viscosity at 40°C of 300 mm 2 /s or more.
• the kinematic viscosity of the base oil can be adjusted within a predetermined range, with the low torque performance at low temperatures being satisfied without impairing the resistance to evaporation.
• the highly purified oil may comprise the one having a kinematic viscosity at 40°C of 80 to 130 mm 2 /s, more preferably 80 to 110 mm 2 /s.
• the low torque performance can be satisfied, and at the same time, the resistance to evaporation can be improved.
• the pour point of the synthetic hydrocarbon oil may preferably be -35°C or less. In this case, the low torque performance at low temperatures is satisfactory.
• Examples of other base oil components that can be used in combination with the synthetic hydrocarbon oil include ester type synthetic oils such as diester oils and polyol esters, ether type synthetic oils such as alkyldiphenyl ethers, polyglycol type synthetic oils such as polypropylene glycol, silicone type synthetic oils, and fluorine type synthetic oils.
• ester type synthetic oils are not desirable because hydrolysis may be caused when water is mixed into the grease from the outside, as previously mentioned.
• the ester type synthetic oils have pour points of as high as about -30°C, so that the torque will become high at low temperatures.
• the polyglycol type synthetic oils, silicone type synthetic oils and fluorine type synthetic oils are poor in the lubricating properties and expensive.
• Examples of the thickener generally used in the grease compositions include metallic soaps containing lithium, sodium or the like, and non-soaps such as Benton, silica gel, diurea compounds, fluorine-containing thickeners such as polytetrafluoroethylene and the like.
• the metallic soaps are not satisfactory in terms of the heat resistance, that is, the lubricating life of bearings at high temperatures; Benton and silica gel have poor water resistance; and the fluorine-containing thickeners are considerably expensive and lacking in versatility although the heat resistance is satisfactory.
• the grease composition of the invention comprises a thickener represented by the above formula (1).
• the content of alkyl groups in the above-mentioned formula (1) expressed as [(the number of moles of the alkyl groups) / (the number of moles of the alkyl groups + the number of moles of the cyclohexyl groups)] x 100 is 30 to 100%.
• the content of alkyl groups is less than 30%, the amount of thickener will increase to unfavorably fail to achieve the low torque performance.
• the amount of thickener (B) in the grease composition according to the invention may be preferably 10 to 20 mass%, and more preferably 12 to 17 mass%, from the viewpoint of low torque performance.
• the grease composition of the invention comprises as the rust inhibitor an organic zinc sulfonate and/or alkenylsuccinic anhydride.
• the above-mentioned rust inhibitor can work to disperse water content even if water permeates into the grease from the outside.
• the organic zinc sulfonate is a zinc salt of sulfonic acid having an organic lipophilic group.
• the sulfonic acid includes petroleum sulfonic acids obtainable by sulfonation from an aromatic hydrocarbon moiety in the lubricating oil distillate or a petroleum fraction with a high boiling point, synthetic sulfonic acids such as dinonylnaphthalene sulfonic acid, heavy alkylbenzene sulfonic acid and the like.
• an organic zinc sulfonate represented by the following formula (2) is preferable.
• [R 4 - SO 3 ] 2 Zn (2) (wherein R 4 is an alkyl group, alkenyl group, alkylnaphthyl group, dialkylnaphthyl group, alkylphenyl group or a residue from the high-boiling petroleum fraction, and the above-mentioned alkyl or alkenyl group may be a straight-chain or branched group having 2 to 22 carbon atoms.)
• zinc dioctyl naphthalenesulfonate zinc dinonyl naphthalene sulfonate, zinc didecyl naphthalenesulfonate, zinc petroleum sulfonate, zinc salt of highly basic alkylbenzenesulfonate and the like can be used.
• zinc dinonyl naphthalenesulfonate is most preferable.
• alkenylsuccinic anhydride alkenylsuccinic anhydrides having an alkenyl group with 6 to 18 carbon atoms can preferably be used.
• the alkenylsuccinic anhydrides having an alkenyl group with 10 to 15 carbon atoms are preferable.
• the amount of rust inhibitor (C) in the grease composition according to the invention may be preferably 0.1 to 3 mass%, and more preferably 0.5 to 2 mass% in order to ensure the rust preventing properties under the circumstances where salt water may permeate.
• the grease composition of the invention may further comprise additives generally used in the conventional grease compositions.
• the additives include an antioxidant such as amine-based and phenol-based antioxidants; an inorganic passivator such as sodium nitrite or the like; a rust inhibitor such as amine-based and carboxylate-based rust inhibitors; a metallic corrosion inhibitor such as benzotriazole or the like, an oiliness improver such as fatty acids, fatty acid esters, phosphates and the like; a phosphorus-containing, sulfur-containing or organic metal-containing antiwear agent or extreme-pressure agent; and a solid lubricant such as oxidized metal salts, molybdenum disulfide or the like.
• an antioxidant such as amine-based and phenol-based antioxidants
• an inorganic passivator such as sodium nitrite or the like
• a rust inhibitor such as amine-based and carboxylate-based rust inhibitors
• a metallic corrosion inhibitor such as benzotriazole or
• the grease composition of the invention can be used for rolling bearings, in particular the rolling bearings for automotive electrical equipment and automotive auxiliaries such as the electromagnetic clutch for car air conditioners, center pulley, idler pulley, tension pulley, alternator, water pump and the like.
• automotive auxiliaries such as the electromagnetic clutch for car air conditioners, center pulley, idler pulley, tension pulley, alternator, water pump and the like.
• the low torque performance was determined in accordance with a low temperature torque test defined by JIS K2220 18.
• Bearing type 6204 Test temperatures: 25°C and -30°C
• Rotational speed 1 rpm
• Evaluation item rotational torque (defined as the average torque over a period of the last 15 seconds when the bearing was rotated for 10 minutes.)
• the rust preventing properties were evaluated in accordance with a rust prevention test for bearing in accordance with ASTM D1743-73 specifications.
• the low torque performance and the rust preventing properties were both within the acceptable levels.
• the low torque performance was unacceptable in Comparative Example 1 where the content of the synthetic hydrocarbon oil was 30 mass% or less.
• the low torque performance was unacceptable in Comparative Examples 2 and 3 where the mineral oil not highly purified was contained.
• the low torque performance was also unacceptable in Comparative Examples 4 and 5 where the content of alkyl groups was 30% or less.
• the grease compositions according to the invention are found to be excellent in terms of both low torque performance and rust preventing properties.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Lubricants (AREA)

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• 2010
  • 2010-10-20 JP JP2010235372A patent/JP5766425B2/ja active Active
• 2011
  • 2011-10-20 EP EP11834414.2A patent/EP2631284B1/de active Active
  • 2011-10-20 KR KR1020137011244A patent/KR20130073977A/ko not_active Ceased
  • 2011-10-20 CN CN201180050808.5A patent/CN103210070B/zh active Active
  • 2011-10-20 WO PCT/JP2011/074109 patent/WO2012053575A1/ja not_active Ceased

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