Lubricating oil composition

Abstract

To provide a new lubricating oil composition having properties suitable for lubrication of various mechanisms (for example, seizure resistance, clutch properties, copper corrosion resistance, etc.).SOLUTION: A lubricating oil composition comprising base oil (A), phosphite (B), imide compound (C), amide compound (D), amine compound (E), and benzotriazole compound (F), wherein the content of component (F) is 0.005 to 1.00 mass% based on the total amount of the lubricating oil composition.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to lubricating oil compositions, transmissions, and methods of using the lubricating oil compositions. [Background technology]

[0002] Various devices such as engines, transmissions, reducers, compressors, hydraulic devices, etc. have mechanisms such as torque converters, clutches, gear bearing mechanisms, oil pumps, hydraulic control mechanisms, etc. Lubricating oil compositions are used in these mechanisms, and lubricating oil compositions that can meet various requirements have been developed. For example, Patent Document 1 discloses an invention relating to a lubricating oil composition containing a base oil, a diamine, a glycolic acid amide, and a phosphite ester, which can achieve different friction characteristics between different parts and can be suitably used as a lubricating oil for metal belt-type continuously variable transmissions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 167812 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, lubricating oil compositions used in transmissions equipped with clutch mechanisms are required to have various properties depending on the type of transmission, such as seizure resistance, clutch characteristics, copper corrosion resistance, etc. In other words, there is a demand for novel lubricating oil compositions that have properties suitable for lubricating various mechanisms (e.g., seizure resistance, clutch characteristics, copper corrosion resistance, etc.). [Means for solving the problem]

[0005] The present invention provides a lubricating oil composition comprising a base oil, a phosphite ester, an imide compound, an amide compound, an amine compound, and a benzotriazole compound. Specifically, the present invention provides the lubricating oil composition according to the following aspects [1], [1a] to [1c], and [2] to

[11] , a transmission according to the following aspect

[12] , and a method for using the lubricating oil composition according to the following aspect

[13] . [1] A lubricating oil composition comprising a base oil (A), a phosphite ester (B), a non-boron-modified imide-based compound (C), an amide-based compound (D), an amine-based compound (E), and a benzotriazole-based compound (F), A lubricating oil composition, wherein the content of component (F) is 0.005 to 1.00 mass % based on the total amount of the lubricating oil composition. [1a] Base oil (A), Phosphite ester (B), a non-boron-modified imide-based compound (C) containing a non-boron-modified alkenyl succinimide (C1); an amide-based compound (D) including a fatty acid amide (D1); an amine compound (E) containing a monoamine (E1), and A benzotriazole compound (F) represented by the following general formula (f-0): [ka] (In the above formula, R F1 R is a hydrocarbon group which may contain at least one atom selected from the group consisting of an oxygen atom, a sulfur atom, and a nitrogen atom, or a hydrogen atom. F2 are each independently a hydrocarbon group which may contain at least one atom selected from the group consisting of an oxygen atom, a sulfur atom, and a nitrogen atom; and f1 is an integer of 0 to 4. A lubricating oil composition comprising: A lubricating oil composition, wherein the content of component (F) is 0.005 to 1.00 mass % based on the total amount of the lubricating oil composition. [1b] Base oil (A), Phosphite ester (B), a non-boron-modified imide-based compound (C) containing at least one compound selected from the group consisting of a non-boron-modified alkenyl succinic acid bisimide (C11) represented by the following general formula (c-1) and a non-boron-modified alkenyl succinic acid monoimide (C12) represented by the following general formula (c-2); [ka] (In the above formula, R C1 , R C2 and R C3 are each independently an alkenyl group having a mass average molecular weight (Mw) of 500 to 3,000. 1 , A 2 and A 3 are each independently an alkylene group having 2 to 5 carbon atoms. z1 is an integer of 0 to 10. z2 is an integer of 1 to 10. an amide compound (D) containing at least one selected from fatty acid monoamides (D11) represented by the following general formula (d-1) and fatty acid polyamides (D12) represented by the following general formula (d-2); [ka] (In the above general formula (d-1), R D1 is a hydrocarbon group. D2 and R D3 are each independently a hydrogen atom or a hydrocarbon group which may be substituted with a hydroxyl group. In the above general formula (d-2), R D4 is a hydrocarbon group having 1 to 30 carbon atoms which may be substituted with a hydrogen atom or a hydroxyl group. Each X is independently a hydrogen atom or -(C=O)-R D5 An acyl group (R D5 is a hydrocarbon group), and at least one of the multiple X's is the acyl group. d1 is an integer of 1 to 6. d2 is an integer of 1 or more. an amine compound (E) containing at least one selected from a primary amine (E11) represented by the following general formula (e-1) and a secondary amine (E12) represented by the following general formula (e-2); [ka] (In the above formula, R E are each independently an alkyl group having 1 to 30 carbon atoms, an alkyl group having 1 to 30 carbon atoms and a hydroxyl group, an alkenyl group having 2 to 30 carbon atoms, a cycloalkyl group having 3 to 30 ring carbon atoms, a phenyl group, or a benzyl group. and, A benzotriazole-based compound (F) containing a compound (F1) represented by the following general formula (f-1): [ka] (In the above formula, R F2 A is a hydrocarbon group which may contain at least one atom selected from the group consisting of an oxygen atom, a sulfur atom and a nitrogen atom. f is a divalent hydrocarbon group, and R f1 and R f2 are each independently a monovalent hydrocarbon group, and f1 is an integer of 0 to 4. A lubricating oil composition comprising: A lubricating oil composition, wherein the content of component (F) is 0.005 to 1.00 mass % based on the total amount of the lubricating oil composition. [1c] Base oil (A), Phosphite ester (B), a non-boron-modified imide-based compound (C) containing at least one compound selected from the group consisting of a non-boron-modified alkenyl succinic acid bisimide (C11) represented by the following general formula (c-1) and a non-boron-modified alkenyl succinic acid monoimide (C12) represented by the following general formula (c-2); [ka] (In the above formula, R C1 , R C2 and R C3 are each independently a polybutenyl group having a mass average molecular weight (Mw) of 500 to 3,000. 1 , A 2 and A 3 are each independently an alkylene group having 2 to 5 carbon atoms. z1 is an integer of 0 to 10. z2 is an integer of 1 to 10. an amide compound (D) containing at least one selected from fatty acid monoamides (D11) represented by the following general formula (d-1) and fatty acid polyamides (D12) represented by the following general formula (d-2); [ka] (In the above general formula (d-1), R D1 R is an alkyl group having 1 to 30 carbon atoms or an alkenyl group having 2 to 30 carbon atoms. D2 and R D3 are each independently a hydrogen atom, an alkyl group having 1 to 30 carbon atoms, or an alkenyl group having 2 to 30 carbon atoms. In the above general formula (d-2), R D4 is a hydrogen atom, an alkyl group having 1 to 30 carbon atoms, or an alkenyl group having 2 to 30 carbon atoms. X is independently a hydrogen atom or -(C=O)-R D5 An acyl group (R D5 is a hydrocarbon group), and at least one of the multiple X's is the acyl group. d1 is an integer of 1 to 6. d2 is an integer of 1 or more. an amine compound (E) containing at least one selected from a primary amine (E11) represented by the following general formula (e-1) and a secondary amine (E12) represented by the following general formula (e-2); [ka] (In the above formula, R E are each independently an alkyl group having 1 to 30 carbon atoms, an alkyl group having 1 to 30 carbon atoms and a hydroxyl group, or an alkenyl group having 2 to 30 carbon atoms. and, A benzotriazole-based compound (F) containing a compound (F1) represented by the following general formula (f-1): [ka] (In the above formula, R F2 are each independently an alkyl group having 1 to 20 carbon atoms. f is an alkylene group having 1 to 20 carbon atoms, and R f1 and R f2are each independently an alkyl group having 1 to 20 carbon atoms, and f1 is an integer of 0 to 4. A lubricating oil composition comprising: A lubricating oil composition, wherein the content of component (F) is 0.005 to 1.00 mass % based on the total amount of the lubricating oil composition. [2] The lubricating oil composition according to any one of the above [1] and [1a] to [1c], wherein the content of component (B) is 0.01 to 3.00 mass % based on the total amount of the lubricating oil composition. [3] The lubricating oil composition according to any one of the above [1], [1a] to [1c] and [2], wherein the content ratio of component (F) to component (B) [(F) / (B)] is, in mass ratio, 0.01 to 0.50. [4] The lubricating oil composition according to any one of the above [1] to [3], wherein component (C) comprises a non-boron-modified alkenyl succinimide (C1). [5] The lubricating oil composition according to any one of the above [1] to [4], wherein the component (D) comprises a fatty acid amide (D1). [6] The lubricating oil composition according to [5] above, wherein the content of the fatty acid amide (D1) is 0.04 mass% or more based on the total amount of the lubricating oil composition. [7] The lubricating oil composition according to any one of the above [1] to [6], wherein component (E) comprises a monoamine (E1). [8] The lubricating oil composition according to any one of the above [1] to [7], wherein component (E) comprises one or more selected from primary monoamines (E11) and secondary monoamines (E12). [9] The lubricating oil composition according to any one of the above [1], [1a] to [1c] and [2] to [8], wherein the content ratio of component (E) to component (D) [(E) / (D)] is, in mass ratio, 0.05 to 0.90.

[10] The lubricating oil composition according to any one of the above [1], [1a] to [1c] and [2] to [9], wherein the content of the fatty acid partial ester compound is less than 0.05 mass% based on the total amount of the lubricating oil composition.

[11] The lubricating oil composition according to any one of the above [1], [1a] to [1c] and [2] to

[10] , which is used in a transmission equipped with a clutch mechanism.

[12] A transmission filled with the lubricating oil composition according to any one of the above items [1], [1a] to [1c], and [2] to

[11] .

[13] A method for using the lubricating oil composition according to any one of the above [1], [1a] to [1c] and [2] to

[11] , which comprises applying the lubricating oil composition to a transmission equipped with a clutch mechanism. [Effects of the Invention]

[0006] The lubricating oil composition of a preferred embodiment of the present invention has properties suitable for lubricating various mechanisms, and a more specific lubricating oil composition of a preferred embodiment can improve seizure resistance, clutch characteristics, and copper corrosion resistance in a well-balanced manner. Therefore, these lubricating oil compositions can be suitably used for lubricating, for example, transmissions, etc. DETAILED DESCRIPTION OF THE INVENTION

[0007] Regarding the numerical ranges described herein, the upper and lower limits can be combined in any combination. For example, when a numerical range is described as "preferably 30 to 100, more preferably 40 to 80," the ranges "30 to 80" and "40 to 100" are also included in the numerical ranges described herein. Furthermore, when a numerical range is described as "preferably 30 or more, more preferably 40 or more, and preferably 100 or less, more preferably 80 or less," the ranges "30 to 80" and "40 to 100" are also included in the numerical ranges described herein. In addition, as a numerical range described in this specification, for example, "60 to 100" means a range of "60 or more and 100 or less." Furthermore, in defining the upper and lower limits described in this specification, the numerical range from the lower limit to the upper limit can be defined by appropriately selecting from the respective options and combining them arbitrarily.

[0008] In this specification, the kinematic viscosity and viscosity index refer to values ​​measured or calculated in accordance with JIS K2283:2000. The contents of phosphorus atom (P), boron atom (B) and calcium atom (Ca) refer to values ​​measured in accordance with JPI-5S-38-92. The nitrogen atom (N) content means a value measured in accordance with JIS K2609:1998. The content of sulfur atoms (S) means a value measured in accordance with JIS K2541-6:2013.

[0009] [Constitution of lubricating oil composition] The lubricating oil composition of one embodiment of the present invention contains a base oil (A) (hereinafter also referred to as "component (A)"), a phosphite ester (B) (hereinafter also referred to as "component (B)"), a non-boron-modified imide-based compound (C) (hereinafter also referred to as "component (C)"), an amide-based compound (D) (hereinafter also referred to as "component (D)"), an amine-based compound (E) (hereinafter also referred to as "component (E)"), and a benzotriazole-based compound (F) (hereinafter also referred to as "component (F)"). By containing the above components (A) to (F), the lubricating oil composition of one embodiment of the present invention can be a lubricating oil composition having properties suitable for lubricating various mechanisms, and in a more specific embodiment, it can be a lubricating oil composition that has a good balance of improved seizure resistance, clutch characteristics, and copper corrosion resistance. In particular, in the lubricating oil composition of one embodiment of the present invention, component (B) contributes to improving seizure resistance, components (C), (D) and (E) contribute to improving clutch properties, and component (F) contributes to improving copper corrosion resistance. Because the lubricating oil composition of one embodiment of the present invention has these properties, it can be suitably used, for example, in various devices equipped with a clutch mechanism, and more specifically, it can be suitably used in transmissions equipped with a clutch mechanism.

[0010] The lubricating oil composition of one embodiment of the present invention may further contain various additives other than components (B) to (F) as needed, provided that the effects of the present invention are not impaired. In the lubricating oil composition of one embodiment of the present invention, the total content of components (A) to (F) is, based on the total amount (100 mass%) of the lubricating oil composition, preferably 50 mass% or more, more preferably 60 mass% or more, even more preferably 70 mass% or more, still more preferably 75 mass% or more, and particularly preferably 80 mass% or more, and may also be 100 mass% or less, 99.5 mass% or less, 99.0 mass% or less, 98.0 mass% or less, 97.0 mass% or less, 96.0 mass% or less, 95.0 mass% or less, 94.0 mass% or less, or 93.0 mass% or less. Hereinafter, each component contained in the lubricating oil composition of one embodiment of the present invention will be described in detail.

[0011] <Component (A): Base oil> The base oil, which is component (A) used in one embodiment of the present invention, may be one or more selected from mineral oils and synthetic oils. Examples of mineral oils include atmospheric residues obtained by atmospheric distillation of crude oils such as paraffinic crude oil, intermediate crude oil, and naphthenic crude oil; distillates obtained by vacuum distillation of these atmospheric residues; refined oils obtained by subjecting the distillates to one or more refining processes such as solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, and hydrotreating (hydrocracking); and mineral oils (GTL) obtained by isomerizing GTL wax (Gas to Liquids Wax) produced from natural gas by the Fischer-Tropsch process or the like.

[0012] Examples of synthetic oils include poly-α-olefins such as α-olefin homopolymers or α-olefin copolymers (for example, α-olefin copolymers having 8 to 14 carbon atoms, such as ethylene-α-olefin copolymers); isoparaffins; polyalkylene glycols; ester-based oils such as polyol esters, dibasic acid esters, and phosphate esters; ether-based oils such as polyphenyl ethers; alkylbenzenes; and alkylnaphthalenes.

[0013] Component (A) used in one embodiment of the present invention preferably contains one or more selected from mineral oils classified into Group II and Group III of the API (American Petroleum Institute) base oil category and synthetic oils.

[0014] The kinematic viscosity at 100°C of the component (A) used in one embodiment of the present invention is preferably 2.0 mm 2 / s or more, preferably 2.2 mm 2 / s or more, more preferably 2.3 mm 2 / s or more, and even more preferably 2.5 mm 2 / s or more, particularly preferably 2.6 mm 2 / s or more, and preferably 6.0 mm 2 / s or less, preferably 5.7 mm 2 / s or less, preferably 5.5 mm 2 / s or less, more preferably 5.2 mm 2 / s or less, more preferably 5.0 mm 2 / s or less, and even more preferably 4.8 mm 2 / s or less, particularly preferably 4.6 mm 2 / s or less.

[0015] Furthermore, the viscosity index of the component (A) used in one embodiment of the present invention is preferably 70 or greater, more preferably 80 or greater, even more preferably 90 or greater, and even more preferably 100 or greater.

[0016] In one embodiment of the present invention, when a mixed oil of two or more base oils is used as component (A), the mixed oil preferably has a kinematic viscosity and viscosity index within the above ranges. Therefore, the mixed oil may be prepared by using a low-viscosity base oil and a high-viscosity base oil in combination so as to have a kinematic viscosity and viscosity index within the above ranges. The mixed oil may be a mixed oil obtained by combining two or more base oils whose kinematic viscosity and viscosity index at 100° C. are within the above-mentioned ranges, or a mixed oil obtained by combining a base oil whose kinematic viscosity and viscosity index at 100° C. are within the above-mentioned ranges with a base oil whose kinematic viscosity and viscosity index at 100° C. are outside the above-mentioned ranges. The mixed oil may also be a mixed oil adjusted to fall within the above-mentioned ranges by combining a low-viscosity base oil and a high-viscosity base oil whose kinematic viscosity and viscosity index at 100° C. are outside the above-mentioned ranges.

[0017] In the lubricating oil composition of one embodiment of the present invention, the content of component (A) is, based on the total amount (100 mass%) of the lubricating oil composition, preferably 30 mass% or more, more preferably 40 mass% or more, even more preferably 50 mass% or more, still more preferably 55 mass% or more, and particularly preferably 60 mass% or more, and may be 99 mass% or less, 98 mass% or less, 97 mass% or less, 95 mass% or less, 92 mass% or less, 90 mass% or less, 85 mass% or less, 80 mass% or less, or 75 mass% or less.

[0018] <Component (B): Phosphite ester> The lubricating oil composition of one embodiment of the present invention contains a phosphite ester as component (B). By containing component (B), it is possible to obtain a lubricating oil composition with improved anti-seizure properties. In one embodiment of the present invention, the component (B) may be used alone or in combination of two or more types.

[0019] Examples of the phosphite ester used as component (B) in one embodiment of the present invention include acid phosphites represented by the following general formula (b-1) or (b-2). [ka]

[0020] In the above formula, R B are each independently an alkyl group having 1 to 30 carbon atoms, an alkenyl group having 2 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms which may be substituted with an alkyl group having 1 to 6 carbon atoms, a group having a sulfide bond, etc. B may be the same or different from each other.

[0021] R B Examples of the alkyl group that can be selected as the alkyl group include a methyl group, an ethyl group, a propyl group (n-propyl group, isopropyl group), a butyl group (n-butyl group, s-butyl group, t-butyl group, isobutyl group), a pentyl group, a hexyl group, a 2-ethylhexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a hexadecyl group, and an octadecyl group. These alkyl groups may be straight-chain alkyl groups or branched-chain alkyl groups. The alkyl group has 1 to 30 carbon atoms, but may have 3 or more, 5 or more, 6 or more, or 8 or more carbon atoms, and may have 20 or less, 16 or less, 14 or less, or 12 or less carbon atoms.

[0022] R B Examples of the alkenyl group that can be selected as the alkenyl group include an ethenyl group, a propenyl group, a butenyl group, a pentenyl group, a hexenyl group, a heptenyl group, an octenyl group, a nonenyl group, a decenyl group, an undecenyl group, a dodecenyl group, a tridecenyl group, a tetradecenyl group, a pentadecenyl group, a hexadecenyl group, and an octadecenyl group. These alkenyl groups may be straight-chain alkenyl groups or branched-chain alkenyl groups. The alkenyl group has 2 to 30 carbon atoms, but may have 3 or more, 5 or more, 6 or more, or 8 or more carbon atoms, and may have 16 or less, 14 or less, or 12 or less carbon atoms.

[0023] R BExamples of the aryl group that can be selected as include a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, a biphenyl group, a terphenyl group, and a phenylnaphthyl group, with a phenyl group being preferred. Examples of the "alkyl group having 1 to 6 carbon atoms" that can substitute for these aryl groups include the alkyl groups having 1 to 6 carbon atoms mentioned above.

[0024] R B As the group having a sulfide bond that can be selected as the group, a group represented by the following general formula (bi) is preferred. [ka] In the above formula (bi), R b1 is a hydrogen atom or a monovalent organic group having 1 to 20 carbon atoms. b2 is a divalent organic group. x is an integer of 1 or more, preferably an integer of 1 to 10, more preferably an integer of 1 to 5, even more preferably an integer of 1 to 3, still more preferably 1 or 2, and particularly preferably 1. * indicates a bonding position.

[0025] R b1 Examples of the monovalent organic group that can be selected as are alkyl groups, alkenyl groups, and aryl groups. Preferably, the alkyl group has 1 to 20 carbon atoms, or a group in which at least one -CH2- structure of an alkyl group having 1 to 20 carbon atoms (preferably 2 to 18, more preferably 4 to 16, even more preferably 6 to 12, and still more preferably 8 to 10) is substituted with -O-, -S-, -COO-, -OCO-, -CSO-, -OCS-, -CH=CH-, or -C≡C-, and more preferably an alkyl group.

[0026] R b2Examples of the divalent organic group that can be selected as are alkylene groups, cycloalkylene groups, alkenylene groups, cycloalkenylene groups, and arylene groups having 1 to 20 carbon atoms. An alkylene group having 1 to 20 carbon atoms or an alkylene group having 1 to 20 carbon atoms (preferably 2 to 12, more preferably 2 to 8, and even more preferably 2 to 4) in which at least one -CH2- structure is substituted with -O-, -S-, -COO-, -OCO-, -CSO-, -OCS-, -CH=CH-, or -C≡C- is preferred, and an alkylene group having 2 to 20 carbon atoms is more preferred.

[0027] R in the general formula (b-1) or (b-2) B Examples of the phosphite ester when is a group having a sulfide bond include compounds represented by the following general formula (b-11) and compounds represented by the following general formula (b-21). [ka]

[0028] In the formulas (b-11) and (b-21), R b11 and R b12 are each independently a hydrogen atom or an alkyl group having 1 to 20 carbon atoms (preferably 2 to 18, more preferably 4 to 16, even more preferably 6 to 12, and still more preferably 8 to 10). The alkyl group may be a linear alkyl group or a branched alkyl group. Furthermore, a1, a2, and a3 are each independently an integer of 1 to 20, preferably an integer of 1 to 12, more preferably an integer of 1 to 8, even more preferably an integer of 1 to 4, still more preferably 1, 2, or 4, and particularly preferably 2.

[0029] The phosphite ester used as component (B) in one embodiment of the present invention may be in the form of an amine salt. The amine that forms the amine salt is preferably a compound represented by the following general formula (b-3): The amine may be used alone or in combination of two or more kinds. [ka]

[0030] In the above general formula (b-3), r is an integer of 1 to 3, and is preferably 1. R x are each independently an alkyl group having 6 to 18 carbon atoms, an alkenyl group having 6 to 18 carbon atoms, an aryl group having 6 to 18 carbon atoms, or a hydroxyalkyl group having 6 to 18 carbon atoms. In addition, R x If there are multiple R x may be the same or different from each other.

[0031] R x The alkyl group having 6 to 18 carbon atoms, the alkenyl group having 6 to 18 carbon atoms, and the aryl group having 6 to 18 carbon atoms that can be selected as R B Among the groups exemplified as the alkyl group, alkenyl group, and aryl group that can be selected as the aryl group, groups having a carbon number within the above ranges can be mentioned. Furthermore, examples of the hydroxyalkyl group having 6 to 18 carbon atoms include groups in which a hydrogen atom in an alkyl group having 6 to 18 carbon atoms has been substituted with a hydroxy group, and specific examples thereof include a hydroxyhexyl group, a hydroxyoctyl group, a hydroxydodecyl group, and a hydroxytridecyl group.

[0032] In the lubricating oil composition of one embodiment of the present invention, the content of component (B) is, based on the total amount (100% by mass) of the lubricating oil composition, preferably 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.07% by mass or more, still more preferably 0.10% by mass or more, particularly preferably 0.15% by mass or more, and even further preferably 0.20% by mass or more, 0.30% by mass or more, 0.40% by mass or more, 0.50% by mass or more, from the viewpoint of obtaining a lubricating oil composition with further improved anti-seizure properties. Alternatively, from the viewpoint of obtaining a lubricating oil composition that has a good balance of various properties such as seizure resistance, clutch characteristics, and copper corrosion resistance, the content is preferably 3.00% by mass or less, more preferably 2.70% by mass or less, even more preferably 2.50% by mass or less, still more preferably 2.20% by mass or less, particularly preferably 2.00% by mass or less, and may further be 1.80% by mass or less, 1.70% by mass or less, or 1.60% by mass or less.

[0033] From the above viewpoints, in the lubricating oil composition of one embodiment of the present invention, the content of component (B) in terms of phosphorus atoms, based on the total amount (100 mass%) of the lubricating oil composition, is preferably 10 ppm by mass or more, more preferably 20 ppm by mass or more, even more preferably 30 ppm by mass or more, still more preferably 40 ppm by mass or more, particularly preferably 50 ppm by mass or more, and may be 60 ppm by mass or more, 70 ppm by mass or more, 80 ppm by mass or more, 90 ppm by mass or more, 100 ppm by mass or more, or 110 ppm by mass or more; and is preferably 800 ppm by mass or less, more preferably 700 ppm by mass or less, even more preferably 600 ppm by mass or less, still more preferably 500 ppm by mass or less, particularly preferably 400 ppm by mass or less, and may be 350 ppm by mass or less, 300 ppm by mass or less, 250 ppm by mass or less, 220 ppm by mass or less, 200 ppm by mass or less, or 180 ppm by mass or less.

[0034] <Phosphate ester> The lubricating oil composition of one embodiment of the present invention may further contain a phosphate ester within a range that does not impair the effects of the present invention. Examples of the phosphate ester include neutral phosphate esters represented by the following general formula (b'-4) and acidic phosphate esters represented by the following general formula (b'-5) or (b'-6). [ka] In the above formula, R each independently represents an alkyl group having 1 to 30 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 18 carbon atoms which may be substituted with an alkyl group having 1 to 6 carbon atoms, a group having a sulfide bond, etc., and specifically, R in the general formulas (b-1) and (b-2) B The R groups may be the same as those that can be selected as the R groups. Note that multiple R groups may be the same or different from each other. These phosphate esters may be used alone or in combination of two or more.

[0035] In the lubricating oil composition of one embodiment of the present invention, the content of the phosphate ester, based on the total amount (100 mass%) of the lubricating oil composition, may be, for example, 0.01 mass% or more, 0.03 mass% or more, 0.05 mass% or more, 0.07 mass% or more, 0.10 mass% or more, or 0.12 mass% or more; or 2.00 mass% or less, 1.50 mass% or less, 1.20 mass% or less, 1.00 mass% or less, 0.80 mass% or less, 0.70 mass% or less, 0.60 mass% or less, or 0.50 mass% or less.

[0036] In the lubricating oil composition of one embodiment of the present invention, the content of the phosphate ester may be, for example, 1.0 part by mass or more, 3.0 parts by mass or more, 5.0 parts by mass or more, 7.0 parts by mass or more, 10 parts by mass or more, or 12 parts by mass or more, relative to 100 parts by mass of the total amount of component (B) contained in the lubricating oil composition; or 100 parts by mass or less, 80 parts by mass or less, 70 parts by mass or less, 60 parts by mass or less, 50 parts by mass or less, 40 parts by mass or less, 30 parts by mass or less, or 20 parts by mass or less.

[0037] <Component (C): Non-boron-modified imide compound> The lubricating oil composition of one embodiment of the present invention contains a non-boron-modified imide compound as component (C). The inclusion of component (C) provides a lubricating oil composition with improved clutch properties, particularly contributing to improved clutch capacity. In one embodiment of the present invention, the component (C) may be used alone or in combination of two or more types.

[0038] In this specification, the term "imide-based compound" refers to a compound having an imide structure represented by the following formula (c-0), and includes a chain compound having the imide structure and a cyclic compound having the imide structure. [ka] (In the above formula, * indicates the bond position.)

[0039] Component (C) used in one embodiment of the present invention is a non-boron-modified imide-based compound, and may be any compound having an imide structure represented by formula (c-0) that is not modified with boron. Therefore, it may be a modified imide-based compound obtained by reacting a compound having the imide structure with one or more compounds selected from alcohols, aldehydes, ketones, alkylphenols, cyclic carbonates, epoxy compounds, and organic acids. Alternatively, it may be an unmodified imide-based compound.

[0040] From the viewpoint of providing a lubricating oil composition with improved clutch properties (particularly clutch capacity), the component (C) used in one embodiment of the present invention preferably contains a non-boron-modified alkenyl succinimide (C1). In the lubricating oil composition of one embodiment of the present invention, the content of component (C1) in component (C) is preferably 50 to 100 mass%, more preferably 65 to 100 mass%, even more preferably 80 to 100 mass%, still more preferably 90 to 100 mass%, and particularly preferably 95 to 100 mass%, based on the total amount (100 mass%) of component (C) contained in the lubricating oil composition.

[0041] The non-boron-modified alkenyl succinimide (C1) used in one aspect of the present invention is preferably at least one selected from, for example, a non-boron-modified alkenyl succinic acid bisimide (C11) represented by the following general formula (c-1) and a non-boron-modified alkenyl succinic acid monoimide (C12) represented by the following general formula (c-2): [ka]

[0042] In the above general formulas (c-1) and (c-2), R C1 , R C2 and R C3 are each independently an alkenyl group having a mass average molecular weight (Mw) of 500 to 3000 (preferably 900 to 2500). R C1 , R C2 and R C3 Examples of the alkenyl group that can be selected as include a polybutenyl group, a polyisobutenyl group, an ethylene-propylene copolymer, and the like. Among these, a polybutenyl group or a polyisobutenyl group is preferred. A 1 , A 2 and A 3 are each independently an alkylene group having 2 to 5 carbon atoms. z1 is an integer of 0 to 10, preferably an integer of 1 to 4, and more preferably 2 or 3. z2 is an integer of 1 to 10, preferably an integer of 2 to 5, and more preferably 3 or 4.

[0043] Components (C11) and (C12) may be modified alkenyl succinimides that have been reacted with one or more compounds selected from alcohols, aldehydes, ketones, alkylphenols, cyclic carbonates, epoxy compounds, and organic acids, or may be unmodified alkenyl succinimides that have not been modified with such compounds.

[0044] In the lubricating oil composition of one embodiment of the present invention, the content of component (C) is, based on the total amount (100 mass%) of the lubricating oil composition, preferably 0.01 mass% or more, more preferably 0.05 mass% or more, even more preferably 0.07 mass% or more, still more preferably 0.10 mass% or more, particularly preferably 0.15 mass% or more, and even more preferably 0.20 mass% or more, 0.25 mass% or more, 0.30 mass% or more, from the viewpoint of obtaining a lubricating oil composition with further improved clutch characteristics (particularly clutch capacity). It may be 0.35% by mass or more, or 0.40% by mass or more, and from the viewpoint of obtaining a lubricating oil composition that has a good balance of various properties such as seizure resistance, clutch characteristics, and copper corrosion resistance, it is preferably 3.00% by mass or less, more preferably 2.50% by mass or less, even more preferably 2.00% by mass or less, still more preferably 1.50% by mass or less, particularly preferably 1.20% by mass or less, and may further be 1.00% by mass or less, 0.90% by mass or less, or 0.80% by mass or less.

[0045] From the above viewpoints, in the lubricating oil composition of one embodiment of the present invention, the content of component (C) calculated as nitrogen atoms, based on the total amount (100% by mass) of the lubricating oil composition, is preferably 10 ppm by mass or more, more preferably 30 ppm by mass or more, even more preferably 50 ppm by mass or more, still more preferably 70 ppm by mass or more, and particularly preferably 90 ppm by mass or more, and is preferably 600 ppm by mass or less, more preferably 500 ppm by mass or less, even more preferably 400 ppm by mass or less, still more preferably 300 ppm by mass or less, and particularly preferably 200 ppm by mass or less.

[0046] <Boron-modified imide compounds> The lubricating oil composition of one embodiment of the present invention may further contain a boron-modified imide compound within a range that does not impair the effects of the present invention. By containing a boron-modified imide compound, it is possible to obtain a lubricating oil composition that can maintain excellent clutch characteristics (particularly clutch capacity) even after long-term use. Examples of the boron-modified imide-based compound include modified compounds obtained by reacting the above-mentioned non-modified imide-based compounds with boron compounds.

[0047] In the lubricating oil composition of one embodiment of the present invention, the content of the boron-modified imide compound, based on the total amount (100 mass%) of the lubricating oil composition, is, from the above-mentioned viewpoints, preferably 0.01 mass% or more, 0.05 mass% or more, 0.10 mass% or more, 0.30 mass% or more, 0.50 mass% or more, 1.00 mass% or more, 1.50 mass% or more, 2.00 mass% or more, or 2.50 mass% or more, and is preferably 7.00 mass% or less, 6.00 mass% or less, 5.50 mass% or less, 5.00 mass% or less, 4.50 mass% or less, 4.00 mass% or less, 3.80 mass% or less, or 3.60 mass% or less.

[0048] In the lubricating oil composition of one embodiment of the present invention, the content of the boron-modified imide compound is, from the above-mentioned viewpoints, preferably 100 parts by mass or more, 200 parts by mass or more, 300 parts by mass or more, 400 parts by mass or more, 500 parts by mass or more, or 600 parts by mass or more, and is preferably 1200 parts by mass or less, 1000 parts by mass or less, 900 parts by mass or less, 800 parts by mass or less, 750 parts by mass or less, or 700 parts by mass or less, per 100 parts by mass of the total amount of component (C) contained in the lubricating oil composition.

[0049] In the lubricating oil composition of one embodiment of the present invention, the content of the boron-modified imide-based compound, calculated as boron atoms, based on the total amount (100 mass%) of the lubricating oil composition, is preferably 10 ppm by mass or more, 30 ppm by mass or more, 50 ppm by mass or more, 70 ppm by mass or more, or 100 ppm by mass or more, and is preferably 800 ppm by mass or less, 600 ppm by mass or less, 500 ppm by mass or less, 400 ppm by mass or less, 300 ppm by mass or less, 250 ppm by mass or less, 200 ppm by mass or less, or 180 ppm by mass or less, from the above-mentioned viewpoints.

[0050] In the lubricating oil composition of one embodiment of the present invention, the ratio of the content of boron atoms derived from the boron-modified imide compound to the content of nitrogen atoms derived from component (C) and the boron-modified imide compound [B / N] is preferably 0.01 or more, more preferably 0.03 or more, more preferably 0.05 or more, even more preferably 0.07 or more, even more preferably 0.10 or more, still more preferably 0.12 or more, and particularly preferably 0.15 or more, and is also preferably 0.80 or less, more preferably 0.70 or less, more preferably 0.60 or less, even more preferably 0.50 or less, even more preferably 0.40 or less, still more preferably 0.30 or less, and particularly preferably 0.25 or less.

[0051] <Component (D): Amide-based compound> The lubricating oil composition of one embodiment of the present invention contains an amide compound as component (D). By including component (D), it is possible to obtain a lubricating oil composition with improved clutch properties (particularly, improved shudder prevention). In one embodiment of the present invention, the component (D) may be used alone or in combination of two or more types.

[0052] In this specification, "amide-based compounds" refer to compounds having an amide structure (excluding structures corresponding to imide structures) represented by the following formula (d-0), and include chain compounds having the amide structure and cyclic compounds having the amide structure. Furthermore, "amide-based compounds" may be any compounds having the amide structure, and include, for example, fatty acid amides, aromatic amides, alicyclic amides, etc. [ka] (In the above formula, * indicates the bond position.)

[0053] Examples of component (D) used in one embodiment of the present invention include condensation compounds of monoamines or polyamines with carboxylic acids, and specific examples include compounds represented by the following general formula (d-1) or (d-2): [ka]

[0054] In the above general formula (d-1), R D1 is a hydrocarbon group. D2 and R D3 are each independently a hydrogen atom or a hydrocarbon group which may be substituted with a hydroxyl group.

[0055] In the above general formula (d-2), R D4 is a hydrocarbon group having 1 to 30 carbon atoms which may be substituted with a hydrogen atom or a hydroxyl group. Each X is independently a hydrogen atom or -(C=O)-R D5 An acyl group (R D5 is a hydrocarbon group), and at least one of the multiple Xs is the acyl group. d1 is an integer of 1 to 6, preferably an integer of 1 to 4, more preferably an integer of 2 or 3, and even more preferably 2. d2 is an integer of 1 or more, preferably an integer of 1 to 20, more preferably an integer of 1 to 15, even more preferably an integer of 1 to 10, still more preferably an integer of 2 to 8, and particularly preferably an integer of 2 to 6.

[0056] R D1 , R D2 , R D3 , R D4 , and R D5 Examples of the hydrocarbon group that can be selected as the alkyl group include an alkyl group having 1 to 30 carbon atoms, an alkenyl group having 2 to 30 carbon atoms, and an aryl group having 6 to 30 carbon atoms that may be substituted with an alkyl group having 1 to 6 carbon atoms.

[0057] Examples of the alkyl group include a methyl group, an ethyl group, a propyl group (n-propyl group, isopropyl group), a butyl group (n-butyl group, s-butyl group, t-butyl group, isobutyl group), a pentyl group, a hexyl group, a 2-ethylhexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a hexadecyl group, and an octadecyl group. These alkyl groups may be straight-chain alkyl groups or branched-chain alkyl groups. The alkyl group has 1 to 30 carbon atoms, but may have 2 or more, 5 or more, 8 or more, 10 or more, or 12 or more carbon atoms, and may have 28 or less, 26 or less, 24 or less, 22 or less, or 20 or less carbon atoms.

[0058] Examples of the alkenyl group include ethenyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, and octadecenyl groups. These alkenyl groups may be straight-chain alkenyl groups or branched-chain alkenyl groups. The alkenyl group has 2 to 30 carbon atoms, but may have 3 or more, 5 or more, 8 or more, 10 or more, or 12 or more carbon atoms, and may have 28 or less, 26 or less, 24 or less, 22 or less, or 20 or less carbon atoms.

[0059] Examples of the aryl group include a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, a biphenyl group, a terphenyl group, and a phenylnaphthyl group, with a phenyl group being preferred. Examples of the "alkyl group having 1 to 6 carbon atoms" that can substitute for these aryl groups include the alkyl groups having 1 to 6 carbon atoms mentioned above.

[0060] In one embodiment of the present invention, from the viewpoint of obtaining a lubricating oil composition with improved clutch properties (particularly, improved shudder prevention), component (D) preferably contains a fatty acid amide (D1). In the lubricating oil composition of one embodiment of the present invention, the content of component (D1) in component (D) is preferably 60 to 100 mass%, more preferably 70 to 100 mass%, even more preferably 80 to 100 mass%, still more preferably 90 to 100 mass%, and particularly preferably 95 to 100 mass%, based on the total amount (100 mass%) of component (D) contained in the lubricating oil composition.

[0061] The component (D1) used in one embodiment of the present invention is R in the general formula (d-1). D1 is an alkyl group having 1 to 30 carbon atoms or an alkenyl group having 2 to 30 carbon atoms, and R D2 and R D3 are each independently a hydrogen atom, an alkyl group having 1 to 30 carbon atoms, or an alkenyl group having 2 to 30 carbon atoms. In another embodiment of the present invention, the component (D1) is a compound represented by the general formula (d-2) R D4 is a hydrogen atom, an alkyl group having 1 to 30 carbon atoms, or an alkenyl group having 2 to 30 carbon atoms, and X is each independently a hydrogen atom or -(C=O)-R D5 An acyl group (R D5 is a hydrocarbon group), and at least one of the plurality of X's is the acyl group. That is, the component (D) used in one embodiment of the present invention preferably contains at least one selected from the components (D11) and (D12), and more preferably contains at least the component (D12).

[0062] The alkyl group of the fatty acid monoamide (D11) and the fatty acid polyamide (D12) has 1 to 30 carbon atoms, preferably 2 or more, more preferably 5 or more, even more preferably 8 or more, still more preferably 10 or more, and particularly preferably 12 or more, and preferably 28 or less, more preferably 26 or less, even more preferably 24 or less, still more preferably 22 or less, and particularly preferably 20 or less. The number of carbon atoms in the alkenyl group of the fatty acid monoamide (D11) and the fatty acid polyamide (D12) is 2 to 30, preferably 3 or more, more preferably 5 or more, even more preferably 8 or more, still more preferably 10 or more, particularly preferably 12 or more, and preferably 28 or less, more preferably 26 or less, even more preferably 24 or less, still more preferably 22 or less, particularly preferably 20 or less.

[0063] In the lubricating oil composition of one embodiment of the present invention, the content of component (D) is preferably 0.04% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.07% by mass or more, still more preferably 0.10% by mass or more, and particularly preferably 0.12% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition, from the viewpoint of obtaining a lubricating oil composition with further improved clutch characteristics (particularly, shudder prevention properties). From the viewpoint of obtaining a lubricating oil composition with a good balance of various properties, the content is preferably 3.00 mass% or less, more preferably 2.50 mass% or less, even more preferably 2.00 mass% or less, still more preferably 1.50 mass% or less, and particularly preferably 1.20 mass% or less, and may further be 1.00 mass% or less, 0.90 mass% or less, 0.80 mass% or less, 0.70 mass% or less, 0.60 mass% or less, 0.50 mass% or less, 0.40 mass% or less, or 0.30 mass% or less.

[0064] In the lubricating oil composition of one embodiment of the present invention, the content of component (D1) is preferably 0.04% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.07% by mass or more, still more preferably 0.10% by mass or more, and particularly preferably 0.12% by mass or more, based on the total amount (100% by mass) of the lubricating oil composition, from the viewpoint of obtaining a lubricating oil composition with further improved clutch properties (particularly, shudder prevention properties). From the viewpoint of obtaining a lubricating oil composition having a good balance of various properties such as those mentioned above, the content is preferably 3.00% by mass or less, more preferably 2.50% by mass or less, even more preferably 2.00% by mass or less, still more preferably 1.50% by mass or less, and particularly preferably 1.20% by mass or less, and may further be 1.00% by mass or less, 0.90% by mass or less, 0.80% by mass or less, 0.70% by mass or less, 0.60% by mass or less, 0.50% by mass or less, 0.40% by mass or less, or 0.30% by mass or less.

[0065] The component (D) used in one embodiment of the present invention may or may not contain glycolic acid amide. As the glycolic acid amide, R D2 and R D3 a compound in which at least one of R in the general formula (d-2) is a hydrocarbon group having at least one hydroxyl group; D4 At least one of the above is a hydrocarbon group having at least one hydroxyl group. In the lubricating oil composition of one embodiment of the present invention, the content of glycolic acid amide may be less than 0.8 mass%, less than 0.5 mass%, less than 0.1 mass%, less than 0.05 mass%, less than 0.01 mass%, less than 0.001 mass%, less than 0.0001 mass%, or 0 mass% (not detectable), based on the total amount (100 mass%) of the lubricating oil composition.

[0066] <Component (E): Amine compound> The lubricating oil composition of one embodiment of the present invention contains an amine compound as component (E). By including component (E), it is possible to obtain a lubricating oil composition with improved clutch properties (particularly, improved shudder prevention). In one embodiment of the present invention, the component (E) may be used alone or in combination of two or more types.

[0067] Component (E) used in one embodiment of the present invention may be any of a monoamine having one amino nitrogen atom in one molecule, a diamine having two amino nitrogen atoms in one molecule, and a polyamine having three or more amino nitrogen atoms in one molecule. In this specification, the "amine compound" used as component (E) excludes ring-structure compounds containing an amino nitrogen atom as a ring-forming atom, such as hexahydro-1,3,5-tris-(2-hydroxyethyl)triazine, etc. Therefore, the benzotriazole compound (F) described below is not included in component (E).

[0068] Among these, from the viewpoint of obtaining a lubricating oil composition with improved clutch properties (particularly, improved shudder prevention), the component (E) used in one embodiment of the present invention preferably contains a monoamine (E1). In the lubricating oil composition of one embodiment of the present invention, the content of component (E1) in component (E) is preferably 60 to 100 mass%, more preferably 70 to 100 mass%, even more preferably 80 to 100 mass%, still more preferably 90 to 100 mass%, and particularly preferably 95 to 100 mass%, based on the total amount (100 mass%) of component (E) contained in the lubricating oil composition.

[0069] The monoamines (E1) used as component (E) in one embodiment of the present invention are classified, depending on the number of substituents, into primary monoamines (E11) represented by the following general formula (e-1), secondary monoamines (E12) represented by the following general formula (e-2), and tertiary monoamines (E3) represented by the following general formula (e-3). However, the component (E) used in one embodiment of the present invention preferably contains one or more selected from the group consisting of primary monoamines (E11) represented by the following general formula (e-1) and secondary monoamines (E12) represented by the following general formula (e-2). [ka]

[0070] In the above formula, R E Each of R independently represents a substituent. E may be the same or different from each other. Examples of the substituent include an alkyl group, an alkyl group having a hydroxyl group, an alkenyl group, a cycloalkyl group, a phenyl group, and a benzyl group.

[0071] Substituent R E Examples of the alkyl group that can be selected as the aryl group include a methyl group, an ethyl group, a propyl group (n-propyl group, i-propyl group), a butyl group (n-butyl group, i-butyl group, s-butyl group, t-butyl group), a pentyl group (n-pentyl group, i-pentyl group, neopentyl group), a hexyl group, a heptyl group, an octyl group, a 2-ethylhexyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, and an octadecyl group. The alkyl group may be a straight-chain alkyl group or a branched-chain alkyl group. The number of carbon atoms in the alkyl group is, for example, 1 to 30, but is preferably 3 or more, more preferably 6 or more, more preferably 8 or more, even more preferably 10 or more, still more preferably 12 or more, and particularly preferably 15 or more, and is preferably 28 or less, more preferably 26 or less, even more preferably 24 or less, still more preferably 22 or less, and particularly preferably 20 or less.

[0072] Substituent R E The alkyl group having a hydroxyl group that can be selected as the alkyl group includes the above alkyl groups in which at least one hydrogen atom has been substituted with a hydroxyl group. The alkyl group constituting the group may be a straight-chain alkyl group or a branched-chain alkyl group. The preferred range of the number of carbon atoms in the alkyl group having a hydroxyl group is the same as the number of carbon atoms in the alkyl group described above.

[0073] Substituent R E Examples of the alkenyl group that can be selected as the alkyl group include ethenyl group (vinyl group), propenyl group, butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, dodecenyl group, tridecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, and octadecenyl group (oleyl group). The alkenyl group may be a straight-chain alkenyl group or a branched-chain alkenyl group. The alkenyl group has, for example, 2 to 30 carbon atoms, preferably 3 or more, more preferably 6 or more, more preferably 8 or more, even more preferably 10 or more, still more preferably 12 or more, and particularly preferably 15 or more; and preferably 28 or less, more preferably 26 or less, even more preferably 24 or less, still more preferably 22 or less, and particularly preferably 20 or less.

[0074] Substituent R EExamples of the cycloalkyl group that can be selected as the cycloalkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, and an adamantyl group. The cycloalkyl group has, for example, 3 to 30 ring carbon atoms, preferably 5 or more, more preferably 6 or more, and preferably 24 or less, more preferably 20 or less, even more preferably 18 or less, still more preferably 16 or less, and particularly preferably 12 or less.

[0075] Component (E) used in one embodiment of the present invention preferably contains one or more selected from primary monoamines and secondary monoamines, and more preferably contains at least a primary monoamine.

[0076] In the lubricating oil composition of one embodiment of the present invention, the content of component (E) is, based on the total amount (100% by mass) of the lubricating oil composition, preferably 0.001% by mass or more, more preferably 0.005% by mass or more, even more preferably 0.007% by mass or more, still more preferably 0.010% by mass or more, and particularly preferably 0.012% by mass or more, from the viewpoint of obtaining a lubricating oil composition having a good balance of various properties such as seizure resistance, clutch properties, and copper corrosion resistance. Furthermore, the content of component (E) is preferably 2.00% by mass or less, more preferably 1.50% by mass or less, even more preferably 1.00% by mass or less, still more preferably 0.50% by mass or less, particularly preferably 0.20% by mass or less, and may even be 0.15% by mass or less, 0.10% by mass or less, or 0.080% by mass or less, from the viewpoint of obtaining a lubricating oil composition having a good balance of various properties such as seizure resistance, clutch properties, and copper corrosion resistance.

[0077] The component (E) used in one embodiment of the present invention may or may not contain a diamine. In the lubricating oil composition of one embodiment of the present invention, the diamine content may be less than 0.07 mass%, less than 0.05 mass%, less than 0.03 mass%, less than 0.01 mass%, less than 0.001 mass%, less than 0.0001 mass%, or 0 mass% (not detectable), based on the total amount (100 mass%) of the lubricating oil composition.

[0078] In the lubricating oil composition of one embodiment of the present invention, from the viewpoint of providing a lubricating oil composition with improved clutch properties (particularly, shudder prevention), the content ratio of component (E) to component (D) [(E) / (D)], expressed by mass, is preferably 0.05 or more, more preferably 0.07 or more, even more preferably 0.09 or more, still more preferably 0.10 or more, and particularly preferably 0.11 or more, and is also preferably 0.90 or less, more preferably 0.80 or less, even more preferably 0.70 or less, still more preferably 0.60 or less, and particularly preferably 0.50 or less.

[0079] <Component (F): Benzotriazole-based compound> The lubricating oil composition of one embodiment of the present invention contains a benzotriazole-based compound as component (F). By containing component (F), the lubricating oil composition can have improved copper corrosion resistance. In one embodiment of the present invention, the component (F) may be used alone or in combination of two or more types.

[0080] The benzotriazole-based compound used as component (F) in one embodiment of the present invention may be any compound having a benzotriazole structure, and examples thereof include compounds represented by the following general formula (f-0). [ka]

[0081] In the general formula (f-0), R F1 is a hydrocarbon group which may contain at least one atom selected from the group consisting of an oxygen atom, a sulfur atom and a nitrogen atom, or a hydrogen atom. R F2 are each independently a hydrocarbon group which may contain at least one atom selected from the group consisting of an oxygen atom, a sulfur atom and a nitrogen atom. f1 is an integer of 0 to 4, preferably an integer of 0 to 2, more preferably an integer of 0 to 1, and even more preferably 1.

[0082] Examples of the hydrocarbon group include an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, and a group formed by combining two or more of these groups. R F1 The number of carbon atoms in the hydrocarbon group that can be selected as is, for example, 1 to 30, but is preferably 3 or more, more preferably 6 or more, more preferably 8 or more, even more preferably 10 or more, still more preferably 12 or more, and particularly preferably 15 or more, and is preferably 28 or less, more preferably 26 or less, even more preferably 24 or less, still more preferably 22 or less, and particularly preferably 20 or less. R F2 The number of carbon atoms in the hydrocarbon group that can be selected as is, for example, 1 to 20, preferably 1 to 16, more preferably 1 to 12, more preferably 1 to 8, even more preferably 1 to 6, still more preferably 1 to 4, and particularly preferably 1 to 2.

[0083] Examples of the alkyl group include a methyl group, an ethyl group, a propyl group (n-propyl group, i-propyl group), a butyl group (n-butyl group, i-butyl group, s-butyl group, t-butyl group), a pentyl group (n-pentyl group, i-pentyl group, neopentyl group), a hexyl group, a heptyl group, an octyl group, a 2-ethylhexyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, and an octadecyl group. The alkyl group may be a straight-chain alkyl group or a branched-chain alkyl group.

[0084] Examples of the alkenyl group include ethenyl (vinyl), propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, and octadecenyl (oleyl) groups. The alkenyl group may be a straight-chain alkenyl group or a branched-chain alkenyl group.

[0085] Examples of the cycloalkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, and an adamantyl group.

[0086] Examples of the aryl group include a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, a biphenyl group, a terphenyl group, and a phenylnaphthyl group.

[0087] In addition, R F1 and R F2 Examples of the hydrocarbon group containing at least one atom selected from the group consisting of an oxygen atom, a sulfur atom, and a nitrogen atom that can be selected as above include groups represented by the following formulae (fi) to (f-iii). [ka]

[0088] In the general formulae (fi) to (f-iii), A f is a divalent hydrocarbon group, and R f1 and R f2 are each independently a monovalent hydrocarbon group.

[0089] A f Examples of the divalent hydrocarbon group that can be selected as the alkylene group include an alkylene group having 1 to 20 carbon atoms (preferably 1 to 12, more preferably 1 to 8, even more preferably 1 to 4, and still more preferably 1 to 2), an alkenylene group having 2 to 20 carbon atoms (preferably 2 to 12, more preferably 2 to 8, and even more preferably 2 to 4), a cycloalkylene group having 3 to 20 ring carbon atoms (preferably 3 to 15, more preferably 5 to 12, and even more preferably 5 to 6), and an arylene group having 6 to 30 ring carbon atoms (preferably 6 to 18, more preferably 6 to 15, and even more preferably 6 to 12). Among these, A f is preferably an alkylene group having 1 to 20 carbon atoms (preferably 1 to 12, more preferably 1 to 8, even more preferably 1 to 4, and still more preferably 1 to 2).

[0090] R f1 and R f2 Examples of the monovalent hydrocarbon group that can be selected include an alkyl group having 1 to 20 carbon atoms (preferably 1 to 12, more preferably 1 to 8, even more preferably 1 to 4, and still more preferably 1 to 2), an alkenyl group having 2 to 20 carbon atoms (preferably 2 to 12, more preferably 2 to 8, and even more preferably 2 to 4), a cycloalkyl group having 3 to 20 ring carbon atoms (preferably 3 to 15, more preferably 5 to 12, and even more preferably 5 to 6), and an aryl group having 6 to 30 ring carbon atoms (preferably 6 to 18, more preferably 6 to 15, and even more preferably 6 to 12). Among these, R f1 and R f2 are each independently an alkyl group having 1 to 20 carbon atoms (preferably 1 to 12, more preferably 1 to 8, even more preferably 1 to 4, and still more preferably 1 to 2).

[0091] The component (F) used in one embodiment of the present invention preferably contains a compound (F1) represented by the following general formula (f-1). [ka]

[0092] In the above general formula (f-1), R F2 and f1 is R in the general formula (f-0) above. F2 and f1, and the preferred embodiments of the groups are also the same. f , R f1 and R f2 represents A in the above general formula (f-iii). f , R f1 and R f2 and the preferred embodiments of the groups are also the same. In addition, a preferred embodiment of the compound (F1) is a compound represented by the general formula (f-1) above, wherein R F2are each independently an alkyl group having 1 to 20 carbon atoms (preferably 1 to 16, more preferably 1 to 12, more preferably 1 to 8, even more preferably 1 to 6, still more preferably 1 to 4, and particularly preferably 1 to 2), and A f is an alkylene group having 1 to 20 carbon atoms (preferably 1 to 12, more preferably 1 to 8, even more preferably 1 to 4, and still more preferably 1 to 2), and R f1 and R f2 are each independently an alkyl group having 1 to 20 carbon atoms (preferably 1 to 12, more preferably 1 to 8, even more preferably 1 to 4, and still more preferably 1 to 2). f1 is an integer of 0 to 4 (preferably an integer of 0 to 2, more preferably an integer of 0 to 1, and even more preferably 1).

[0093] In the lubricating oil composition of one embodiment of the present invention, the content of component (F1) in component (F) is preferably 60 to 100 mass%, more preferably 70 to 100 mass%, even more preferably 80 to 100 mass%, still more preferably 90 to 100 mass%, and particularly preferably 95 to 100 mass%, based on the total amount (100 mass%) of component (F) contained in the lubricating oil composition.

[0094] In the lubricating oil composition of one embodiment of the present invention, the content of component (F) is, based on the total amount (100% by mass) of the lubricating oil composition, from the viewpoint of obtaining a lubricating oil composition with improved copper corrosion resistance, 0.005% by mass or more, preferably 0.007% by mass or more, more preferably 0.010% by mass or more, even more preferably 0.015% by mass or more, still more preferably 0.020% by mass or more, and particularly preferably 0.025% by mass or more. Furthermore, from the viewpoint of obtaining a lubricating oil composition with a good balance of various properties such as seizure resistance, clutch characteristics, and copper corrosion resistance, the content is 1.00% by mass or less, preferably 0.80% by mass or less, more preferably 0.70% by mass or less, even more preferably 0.60% by mass or less, still more preferably 0.50% by mass or less, and particularly preferably 0.40% by mass or less.

[0095] In one embodiment of the lubricating oil composition of the present invention, from the viewpoint of providing a lubricating oil composition having improved copper corrosion resistance and seizure resistance in a well-balanced manner, the content ratio of component (F) to component (B) [(E) / (D)], expressed by mass, is preferably 0.01 or more, more preferably 0.015 or more, even more preferably 0.02 or more, still more preferably 0.025 or more, and particularly preferably 0.028 or more, and is preferably 0.50 or less, more preferably 0.40 or less, even more preferably 0.30 or less, still more preferably 0.20 or less, and particularly preferably 0.10 or less.

[0096] <Various additives other than components (B) to (F)> The lubricating oil composition of one embodiment of the present invention may contain various additives other than components (B) to (F) as needed, provided that the effects of the present invention are not impaired. Examples of such various additives include pour point depressants, viscosity index improvers, antioxidants, metal detergents, rust inhibitors, antifoaming agents, and colorants. These lubricating oil additives may be used alone or in combination of two or more.

[0097] The content of each of these lubricating oil additives can be adjusted as appropriate within a range that does not impair the effects of the present invention, but is typically 0.001 to 15 mass%, preferably 0.005 to 10 mass%, and more preferably 0.01 to 5 mass%, for each additive independently, based on the total amount (100 mass%) of the lubricating oil composition.

[0098] [Pour point depressants] The lubricating oil composition of one embodiment of the present invention may further contain a pour point depressant. The pour point depressants may be used alone or in combination of two or more. Examples of pour point depressants used in one embodiment of the present invention include ethylene-vinyl acetate copolymers, condensates of chlorinated paraffin and naphthalene, condensates of chlorinated paraffin and phenol, polymethacrylates, and polyalkylstyrenes. The weight average molecular weight (Mw) of the pour point depressant used in one embodiment of the present invention may be 5,000 or more, 7,000 or more, 10,000 or more, 15,000 or more, 20,000 or more, 25,000 or more, 30,000 or more, 35,000 or more, 40,000 or more, 45,000 or more, 50,000 or more, 55,000 or more, or 60,000 or more, and may be 150,000 or less, 120,000 or less, 100,000 or less, 90,000 or less, or 80,000 or less.

[0099] [Viscosity index improver] The lubricating oil composition of one embodiment of the present invention may further contain a viscosity index improver. The viscosity index improvers may be used alone or in combination of two or more. Examples of viscosity index improvers used in one embodiment of the present invention include polymers such as non-dispersant polymethacrylate, dispersant polymethacrylate, olefin copolymers (e.g., ethylene-propylene copolymers), dispersant olefin copolymers, and styrene copolymers (e.g., styrene-diene copolymers, styrene-isoprene copolymers). The weight average molecular weight (Mw) of the viscosity index improver used in one embodiment of the present invention may be 5,000 or more, 7,000 or more, 10,000 or more, 15,000 or more, or 20,000 or more, and may be 1,000,000 or less, 700,000 or less, 500,000 or less, 300,000 or less, 200,000 or less, 100,000 or less, or 50,000 or less.

[0100] [Antioxidants] The lubricating oil composition of one embodiment of the present invention may further contain an antioxidant. The antioxidants may be used alone or in combination of two or more. Examples of antioxidants used in one embodiment of the present invention include amine-based antioxidants such as alkylated diphenylamine, phenylnaphthylamine, and alkylated phenylnaphthylamine; phenol-based antioxidants such as 2,6-di-t-butylphenol, 4,4'-methylenebis(2,6-di-t-butylphenol), isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, and n-octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate; and sulfur-based antioxidants such as phenothiazine, dioctadecyl sulfide, dilauryl-3,3'-thiodipropionate, and 2-mercaptobenzimidazole.

[0101] [Metallic detergents] The lubricating oil composition of one embodiment of the present invention may further contain a metallic detergent. The metallic detergent may be used alone or in combination of two or more kinds. Examples of the metal-based detergent used in one embodiment of the present invention include metal salts such as metal sulfonates, metal salicylates, and metal phenates. The metal atom constituting the metal salt is preferably a metal atom selected from alkali metals and alkaline earth metals, more preferably sodium, calcium, magnesium, or barium, and even more preferably calcium.

[0102] In the lubricating oil composition of one embodiment of the present invention, the metallic detergent preferably contains one or more selected from calcium sulfonate, calcium salicylate, and calcium phenate, and more preferably contains calcium sulfonate. The calcium sulfonate content is preferably 50 to 100 mass%, more preferably 60 to 100 mass%, even more preferably 70 to 100 mass%, and still more preferably 80 to 100 mass%, based on the total amount (100 mass%) of metallic detergents contained in the lubricating oil composition.

[0103] The base number of the metallic detergent is preferably 0 to 600 mgKOH / g. However, in the lubricating oil composition of one embodiment of the present invention, the metallic detergent is preferably an overbased metallic detergent having a base number of 100 mgKOH / g or more. The base number of the overbased metallic detergent is 100 mgKOH / g or more, preferably 150 to 500 mgKOH / g, and more preferably 200 to 450 mgKOH / g. In this specification, the term "base number" refers to the base number measured by the perchloric acid method in accordance with 7. of JIS K2501:2003 "Petroleum products and lubricants - Test method for neutralization number."

[0104] [Rust inhibitor] The lubricating oil composition of one embodiment of the present invention may further contain a rust inhibitor. The rust inhibitor may be used alone or in combination of two or more kinds. Examples of the rust inhibitor used in one embodiment of the present invention include fatty acids, alkenyl succinic acid half esters, fatty acid soaps, alkyl sulfonates, polyhydric alcohol fatty acid esters, fatty acid amines, oxidized paraffins, and alkyl polyoxyethylene ethers.

[0105] [Antifoaming agent] The lubricating oil composition of one embodiment of the present invention may further contain an antifoaming agent. The antifoaming agents may be used alone or in combination of two or more. Examples of the defoaming agent used in one embodiment of the present invention include alkyl silicone defoaming agents, fluoro silicone defoaming agents, and fluoroalkyl ether defoaming agents.

[0106] [Coloring agent] The lubricating oil composition of one embodiment of the present invention may further contain a colorant. The antifoaming agents may be used alone or in combination of two or more. Examples of the colorant used in one embodiment of the present invention include dyes and pigments.

[0107] [Fatty acid partial ester compounds] The lubricating oil composition of one embodiment of the present invention may or may not contain a fatty acid partial ester compound. Examples of the fatty acid partial ester compound include partial esters obtained by reacting a fatty acid having a hydrocarbon group with 6 to 30 carbon atoms with a fatty acid polyhydric alcohol. In the lubricating oil composition of one embodiment of the present invention, the content of the fatty acid partial ester compound may be less than 0.05 mass%, less than 0.01 mass%, or less than 0.001 mass%, based on the total amount (100 mass%) of the lubricating oil composition.

[0108] <Method of manufacturing lubricating oil composition> There are no particular limitations on the method for producing the lubricating oil composition of one embodiment of the present invention, but from the viewpoint of productivity, it is preferable to have a step of blending components (B) to (F) and, if necessary, other additives other than components (B) to (F) with component (A). Here, the preferred compounds and amounts of the components (A) to (F) and various additives are as described above. Additives such as viscosity index improvers, pour point depressants, and antifoaming agents are preferably blended in a state dissolved in diluent oil.

[0109] [Properties of lubricating oil composition] The lubricating oil composition of one embodiment of the present invention preferably has a kinematic viscosity at 100°C of 2.5 mm 2 / s or more, preferably 3.0 mm 2 / s or more, more preferably 3.5 mm 2 / s or more, and even more preferably 4.0 mm 2 / s or more, particularly preferably 4.5 mm 2 / s or more, and preferably 7.0 mm 2 / s or less, preferably 6.7 mm 2 / s or less, more preferably 6.5 mm 2 / s or less, and even more preferably 6.2 mm 2 / s or less, particularly preferably 6.0 mm 2 / s or less.

[0110] The viscosity index of the lubricating oil composition of one embodiment of the present invention is preferably 80 or greater, more preferably 100 or greater, even more preferably 120 or greater, still more preferably 140 or greater, and particularly preferably 160 or greater.

[0111] The base number (perchloric acid method) of the lubricating oil composition of one embodiment of the present invention is preferably 2.5 to 8.0 mgKOH / g, more preferably 2.5 to 7.5 mgKOH / g, even more preferably 3.0 to 7.0 mgKOH / g, still more preferably 3.5 to 6.5 mgKOH / g, and particularly preferably 4.0 to 6.0 mgKOH / g.

[0112] The phosphorus atom content in the lubricating oil composition of one embodiment of the present invention is, based on the total amount (100% by mass) of the lubricating oil composition, preferably 150 ppm by mass or more, more preferably 200 ppm by mass or more, even more preferably 250 ppm by mass or more, still more preferably 300 ppm by mass or more, and particularly preferably 350 ppm by mass or more; and is preferably 800 ppm by mass or less, more preferably 700 ppm by mass or less, even more preferably 600 ppm by mass or less, still more preferably 550 ppm by mass or less, and particularly preferably 500 ppm by mass or less.

[0113] The nitrogen atom content in the lubricating oil composition of one embodiment of the present invention, based on the total amount (100 mass%) of the lubricating oil composition, is preferably 0.01 mass% or more, more preferably 0.05 mass% or more, even more preferably 0.10 mass% or more, still more preferably 0.15 mass% or more, and particularly preferably 0.20 mass% or more, and is preferably 1.00 mass% or less, more preferably 0.80 mass% or less, even more preferably 0.70 mass% or less, still more preferably 0.60 mass% or less, and particularly preferably 0.50 mass% or less.

[0114] The sulfur atom content in the lubricating oil composition of one embodiment of the present invention, based on the total amount (100% by mass) of the lubricating oil composition, is preferably 0.001% by mass or more, more preferably 0.005% by mass or more, even more preferably 0.010% by mass or more, still more preferably 0.030% by mass or more, particularly preferably 0.050% by mass or more, and is preferably 0.50% by mass or less, more preferably 0.40% by mass or less, even more preferably 0.30% by mass or less, still more preferably 0.20% by mass or less, particularly preferably 0.15% by mass or less.

[0115] The boron atom content in the lubricating oil composition of one embodiment of the present invention is, based on the total amount (100 mass%) of the lubricating oil composition, preferably 0 ppm by mass or more, more preferably 10 ppm by mass or more, even more preferably 50 ppm by mass or more, still more preferably 70 ppm by mass or more, and particularly preferably 100 ppm by mass or more; and is preferably 700 ppm by mass or less, more preferably 500 ppm by mass or less, even more preferably 400 ppm by mass or less, still more preferably 300 ppm by mass or less, and particularly preferably 200 ppm by mass or less.

[0116] The seizure load at 100°C of the lubricating oil composition of one embodiment of the present invention, measured in accordance with ASTM D 3233 under the measurement conditions in the Examples described below, is preferably 5000 N or more, more preferably 5500 N or more, even more preferably 5700 N or more, still more preferably 6000 N or more, and particularly preferably 6200 N or more. The higher the seizure load, the more excellent the seizure resistance of the lubricating oil composition.

[0117] For the lubricating oil composition of one embodiment of the present invention, the static friction coefficient (μs) at 3,000 cycles, measured in accordance with JASOM348-2002 under the measurement conditions in the Examples described below, is preferably 0.115 or more, more preferably 0.117 or more, even more preferably 0.118 or more, still more preferably 0.120 or more, and particularly preferably 0.121 or more. It should be noted that μs is an index showing clutch capacity, and the larger μs, the more sufficient the lubricating oil composition's torque transmission capacity.

[0118] For the lubricating oil composition of one embodiment of the present invention, the μ ratio (μ / μ) of the static friction coefficient (μ) to the dynamic friction coefficient (μ) at 3000 cycles, measured in accordance with JASOM348-2002 under the measurement conditions in the Examples described below, is preferably 1.036 or less, more preferably 1.030 or less, even more preferably 1.025 or less, still more preferably 1.020 or less, and particularly preferably 1.017 or less. The μ ratio is an index showing the ability to prevent shudder, and it can be said that the smaller the μ ratio, the better the ability to prevent shudder and the smoother the gear shifting of the lubricating oil composition.

[0119] When the lubricating oil composition of one embodiment of the present invention is subjected to an ISOT test in accordance with JIS K2514-1:2013, in which a copper plate as a catalyst is added and the test is performed at an oil temperature of 175°C for a test time of 48 hours, the amount of copper eluted is preferably 100 ppm by mass or less, more preferably 80 ppm by mass or less, even more preferably 70 ppm by mass or less, still more preferably 60 ppm by mass or less, and particularly preferably 55 ppm by mass or less. The lower the amount of copper elution, the higher the copper corrosion resistance of the lubricating oil composition. The amount of copper elution is the value measured by the method described in the Examples section below.

[0120] [Uses of lubricating oil composition] A lubricating oil composition according to a preferred embodiment of the present invention can improve seizure resistance, clutch characteristics, and copper corrosion resistance in a well-balanced manner. Considering these properties, the lubricating oil composition of one embodiment of the present invention can be suitably used for lubricating mechanisms such as torque converters, wet clutches, gear bearing mechanisms, oil pumps, and hydraulic control mechanisms that are incorporated into various devices such as engines, transmissions, reducers, compressors, hydraulic devices, etc. Among these, the lubricating oil composition of one embodiment of the present invention is preferably used for lubricating reducers, more preferably in transmissions equipped with clutch mechanisms, and even more preferably in transmissions equipped with clutch mechanisms and installed in hybrid vehicles. The lubricating oil composition of one embodiment of the present invention has excellent lubrication properties such as anti-seizure properties and clutch properties, and also has excellent copper corrosion resistance. Therefore, when the lubricating oil composition of one embodiment of the present invention is used in devices that require both lubrication and cooling performance, such as hybrid vehicles, it improves the lubrication of clutch mechanisms and transmission mechanisms, and also has excellent copper corrosion resistance, so even when used to cool a motor, it can prevent corrosion of the copper-based components that make up the motor. Therefore, the lubricating oil composition of one embodiment of the present invention is also preferably used for lubrication and cooling of devices that integrate a transmission equipped with a clutch mechanism and a mechanism such as a motor made of copper-based components.

[0121] Furthermore, in consideration of the above-mentioned properties of the lubricating oil composition of one embodiment of the present invention, the present invention can also provide the following [1] and [2]. [1] A transmission filled with the lubricating oil composition according to one embodiment of the present invention. [2] Use of the lubricating oil composition according to one embodiment of the present invention described above for lubricating a transmission equipped with a clutch mechanism. The preferred embodiments of the lubricating oil compositions described in [1] and [2] above are as described above. Furthermore, the transmissions described in [1] and [2] above are preferably transmissions equipped with a clutch mechanism, and more preferably transmissions equipped with a clutch mechanism and installed in hybrid vehicles. [Example]

[0122] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples. The methods for measuring various physical properties are as follows.

[0123] (1)Kinematic viscosity, viscosity index Measurements and calculations were made in accordance with JIS K2283:2000. (2) Phosphorus atom, boron atom, and calcium atom content Measurements were performed in accordance with JPI-5S-38-92. (3) Nitrogen atom content Measurements were made in accordance with JIS K2609. (4) Sulfur atom content Measurements were performed in accordance with JIS K2541-6:2013. (5) Base number (perchloric acid method) Measurement was performed in accordance with JIS K2501:2003 (perchloric acid method). (6) Weight average molecular weight (Mw) Measurement was carried out using a gel permeation chromatograph (Agilent Technologies, "1260 Model HPLC") under the following conditions, and the values ​​measured were converted into standard polystyrene values. (Measurement conditions) Column: Two Shodex LF404 columns connected in series. Column temperature: 35℃ Developing solvent: chloroform ·Flow rate: 0.3mL / min

[0124] Example 1, Comparative Examples 1 to 5 Lubricating oil compositions were prepared by adding the types of base oils and various additives shown in Table 1 in the amounts shown in Table 1 and thoroughly mixing them. Details of each component used in preparing the lubricating oil compositions are as follows:

[0125] <Base oil> "Mineral oil (1)": 70N mineral oil classified as Group II of the API base oil category, kinematic viscosity at 100°C = 2.7 mm 2 / s, viscosity index=110. "Mineral oil (2)": 100N mineral oil classified as Group III of the API base oil category, kinematic viscosity at 100°C = 4.1 mm 2 / s, viscosity index=120.

[0126] <Various additives> "Phosphite": R in the general formula (b-11) b11 is an n-octyl group (-CH 17 ), a compound in which a1 is 2 (a compound represented by the following formula (b-11-1)), and R b11 and R b12 is an n-octyl group (-CH 17), a compound in which a2 and a3 are 2 (a compound represented by the following formula (b-21-1)), and having a sulfur atom content of 1.5 mass% and a phosphorus atom content of 1.3 mass%, and a mixture of phosphite esters corresponding to component (B). "Non-boron-modified succinimide": A non-boron-modified succinic acid bisimide having a polybutenyl group with Mw=960, a compound corresponding to component (C11), and a nitrogen atom content of 2.0% by mass. "Boron-modified succinimide": A boron-modified succinic acid bisimide having a polybutenyl group, with a boron atom content of 0.35% by mass and a nitrogen atom content of 1.58% by mass. "Fatty acid amide": a condensation reaction product of isostearic acid and tetraethylenepentamine, which corresponds to component (D1). R in the general formula (d-2) D4 is a hydrogen atom, X is a hydrogen atom or -C(=O)-C 17 H 35 wherein d1 is 2 and d2 is 4 (compound represented by the following formula (d-1-1)). "Monoamine": Oleylamine, a primary monoamine corresponding to component (E1) (a compound represented by the following formula (e-1-1)). "Benzotriazole-based compound": N,N-bis(2-ethylhexyl)aminomethyl-1H-methylbenzotriazole, R F2 is a methyl group, f1 1. A f is a methylene group, R f1 and R f2 is an n-octyl group (a compound represented by the following formula (f-1-1)) corresponding to component (F1). [ka] - "Additive PKG": An additive mixture containing the following ingredients: Viscosity index improver: Mw 15,000 olefin copolymer. Pour point depressant: Polymethacrylate of Mw 30,000. Antioxidants: phenolic antioxidants, amine antioxidants, sulfur-based antioxidants. Phosphate ester: tricresyl phosphate. Metallic detergent: Calcium sulfonate with base number (perchloric acid method) = 350 mg KOH / g. Antifoaming agents: dimethyl silicone antifoaming agents, fluorosilicone antifoaming agents. coloring agent

[0127] The kinematic viscosity, viscosity index, and content of each element of the prepared lubricating oil compositions were measured or calculated, and the following tests were also carried out. The results are shown in Table 1.

[0128] (1) Falex test The seizure load was measured using a closed Falex seizure tester in accordance with ASTM D 3233 under the following measurement conditions. ·Oil temperature: 100℃ Pin material: AISI 3135 Block material: AISI C-1137 Rotation speed: 290 rpm Break-in: 1112N load for 5 minutes The higher the seizure load, the more excellent the seizure resistance of the lubricating oil composition. In this example, a seizure load of 5000 N or more was set as the acceptable criterion for seizure resistance.

[0129] (2) Evaluation test of clutch characteristics Using an SAENo.2 friction tester, in accordance with JASOM348-2012, the dynamic friction coefficient (μd) and static friction coefficient (μ0) were measured under the following measurement conditions, and the static friction coefficient (μs) was measured under static conditions. · Surface pressure: 785kPa ·Oil temperature: 100℃ Dynamic RPM: 3600 rpm Static rotation speed: 0.7 rpm Under the above experimental conditions, μs was measured after 5,000 cycles, and the μ ratio (μ0 / μd) was calculated. μs is an index indicating clutch capacity, and the larger μs, the more sufficient the lubricating oil composition's transmission torque capacity. The μ ratio is also an index indicating shudder prevention, and the smaller the μ ratio, the more excellent the lubricating oil composition's shudder prevention and the smoother the gear shifting. In this example, the acceptance criteria for clutch characteristics were μs of 0.115 or more and μ ratio of 1.036 or less.

[0130] (3) Copper corrosion resistance test In the ISOT test according to JIS K2514-1:2013, a copper plate was added as a catalyst to the test oil, and the sample oil was aged at an oil temperature of 175°C for 48 hours. The amount of copper eluted (ppm by mass) from the aged sample oil was measured according to JPI-5S-38. The lower the amount of copper eluted, the higher the copper corrosion resistance of the lubricating oil composition. In this example, the copper elution amount of 100 ppm by mass or less was used as the pass criterion for copper corrosion resistance.

[0131] [Table 1]

[0132] As can be seen from Table 1, the lubricating oil composition prepared in Example 1 had a good balance of anti-seizure properties, clutch characteristics, and copper corrosion resistance. On the other hand, the lubricating oil compositions prepared in Comparative Examples 1 to 5 were inferior in at least one of anti-seizure properties, clutch characteristics, and copper corrosion resistance. For example, comparing Example 1 with Comparative Example 2, which did not contain a non-boron-modified succinimide, it can be seen that Example 1, which contained a non-boron-modified succinimide, had improved clutch capacity and also improved copper corrosion resistance while maintaining good anti-seizure properties.

Claims

1. A lubricating oil composition comprising a base oil (A), a phosphite ester (B), a non-boron-modified imide-based compound (C), an amide-based compound (D), an amine-based compound (E), and a benzotriazole-based compound (F), the content of component (F) is 0.005 to 1.00 mass% based on the total amount of the lubricating oil composition; The lubricating oil composition has a kinematic viscosity at 100°C of 4.5 mm 2 / s or more.

2. A lubricating oil composition comprising a base oil (A), a phosphite ester (B), a non-boron-modified imide-based compound (C), an amide-based compound (D), an amine-based compound (E), and a benzotriazole-based compound (F), the content of component (F) is 0.005 to 1.00 mass% based on the total amount of the lubricating oil composition; A lubricating oil composition for use in a transmission equipped with a clutch mechanism.

3. 3. The lubricating oil composition according to claim 1, wherein the content of component (B) is 0.01 to 3.00 mass % based on the total amount of the lubricating oil composition.

4. The lubricating oil composition according to any one of claims 1 to 3, wherein the content ratio of component (F) to component (B) [(F) / (B)] is, in mass ratio, from 0.01 to 0.

50.

5. The lubricating oil composition according to any one of claims 1 to 4, wherein component (C) comprises a non-boron-modified alkenyl succinimide (C1).

6. The lubricating oil composition according to any one of claims 1 to 5, wherein component (D) comprises a fatty acid amide (D1).

7. 7. The lubricating oil composition according to claim 6, wherein the content of the fatty acid amide (D1) is 0.04 mass% or more based on the total amount of the lubricating oil composition.

8. The lubricating oil composition according to any one of claims 1 to 7, wherein component (E) comprises a monoamine (E1).

9. The lubricating oil composition according to any one of claims 1 to 8, wherein component (E) comprises one or more selected from primary monoamines (E11) and secondary monoamines (E12).

10. The lubricating oil composition according to any one of claims 1 to 9, wherein the content ratio of component (E) to component (D) [(E) / (D)] is 0.05 to 0.90 in mass ratio.

11. The lubricating oil composition according to any one of claims 1 to 10, wherein the content of the fatty acid partial ester compound is less than 0.05 mass% based on the total amount of the lubricating oil composition.

12. The composition further contains a metal-based detergent containing calcium sulfonate, The lubricating oil composition according to any one of claims 1 to 11, wherein the calcium sulfonate is contained in an amount of 50 to 100 mass% based on the total amount of the metal-based detergent contained in the lubricating oil composition.

13. A transmission filled with the lubricating oil composition according to any one of claims 1 to 12.

14. A method for using a lubricating oil composition, comprising: a base oil (A); a phosphite ester (B); a non-boron-modified imide compound (C); an amide compound (D); an amine compound (E); and a benzotriazole compound (F), wherein the content of component (F) is 0.005 to 1.00 mass% based on the total amount of the lubricating oil composition, and applying the lubricating oil composition to lubricate a transmission equipped with a clutch mechanism.

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