# US 10,865,360 B2 · Lubricating oil composition for engine equipped with supercharging mechanism, method for suppressing low-speed pre-ignition in engine equipped with supercharging mechanism using lubricating oil composition, and method for manufacturing lubricating oil composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,360 B2 - Document ID: US10865360B2 - Status: Granted - Kind: B2 - Application number: 16/086,800 - Filed: 2017-03-24 - Published: 2019-04-04 - Granted: 2020-12-15 - Earliest claimed: 2016-03-24 - Assignees: Idemitsu Kosan Co., Ltd. - Applicants: Idemitsu Kosan Co., Ltd. - Inventors: Toshimasa Utaka; Kazushi Tamura; Akira Iijima - Web page: https://patentgrep.com/patent/US10865360B2 ## CPC - C10M 169/04: Mixtures of base-materials and additives - C10M 125/10: Metal oxides, hydroxides, carbonates or bicarbonates - C10M 129/10: having hydroxy groups bound to a carbon atom of a six-membered aromatic ring - C10M 135/10: Sulfonic acids or derivatives thereof - C10M 159/22: containing phenol radicals - C10M 159/24: containing sulfonic radicals - C10M 2201/062: Oxides; Hydroxides; Carbonates or bicarbonates - C10M 2207/023: having hydroxy groups bound to carbon atoms of six-membered aromatic rings - C10M 2207/028: Overbased salts thereof - C10M 2207/262: derived from hydroxy substituted aromatic acids, e.g. salicylates - C10M 2215/064: Di- and triaryl amines - C10M 2215/28: Amides; Imides - C10M 2219/044: Sulfonic acids, Derivatives thereof, e.g. neutral salts - C10M 2219/046: Overbased sulfonic acid salts - C10N 2010/02: Groups 1 or 11 - C10N 2010/04: Groups 2 or 12 - C10N 2030/04: Detergent property or dispersant property - C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure - C10N 2030/52: {Base number [TBN]} - C10N 2040/25: Internal-combustion engines - C10N 2070/00: Specific manufacturing methods for lubricant compositions - C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33) - C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS ## Abstract Provided is a lubricating oil composition for engine equipped with a forced-induction mechanism capable of lowering the frequency of occurrence of LSPI, while using a calcium-based detergent. The lubricating oil composition for engine equipped with a forced-induction mechanism contains a base oil (A), a metal-containing surfactant (B) containing at least a calcium-containing surfactant (b1), and at least one basic compound (C) selected from a metal carbonate, a metal hydroxide, and an amine-based compound, wherein the content of sulfur contained in the metal-containing surfactant (B) is 0.2 mass % or more on the basis of the whole amount of the metal-containing surfactant (B); the content of a calcium atom is 0.08 to 0.20 mass % on the basis of the whole amount of the composition; and a mass ratio of the content of the basic compound (C) and the content of a calcium atom derived from the calcium-containing surfactant (b1) [(content of (C))/(calcium content derived from (b1))] is 2.0 or more. ## Claims ### Claim 1 A lubricating oil composition for engine equipped with a forced-induction mechanism, the composition comprising: a base oil (A), a metal-containing surfactant (B) containing at least a calcium-containing surfactant (b1), and at least one basic compound (C) selected from the group consisting of a metal carbonate, a metal hydrogencarbonate, a metal hydroxide, and an amine-based compound, wherein the content of sulfur contained in the metal-containing surfactant (B) is 0.2 mass % or more on the basis of the whole amount of the metal-containing surfactant (B); the content of a calcium atom is from 0.08 to 0.20 mass % on the basis of the whole amount of the composition; and a mass ratio of the content of the basic compound (C) and the content of a calcium atom derived from the calcium-containing surfactant (b1) [(content of (C))/(calcium content derived from (b1))] is 2.0 or more; wherein the amine-based compound included for selection as the at least one basic compound (C) is selected from the group consisting of ammonia, a metal-free dithiocarbamate and an aliphatic amine-based compound selected from the group consisting of an amine compound (c1) having one or more hydroxy groups and one or more amino groups represented by the following general formulae (C1) ,(C2), (C3) and (C4); an amine compound (c2) having two or more amino groups represented by the general formula (C3) or (C4); and an amine compound (c3) having only one amino group represented by the general formula (C5), wherein R1, R10, R11, R16, R29, and R47 are each a hydrocarbon group having a carbon number of 1 to 32, and R10 and R11 may be the same as or different from each other, such hydrocarbon group being saturated or unsaturated, aliphatic or aromatic, and straight-chained, branched, or cyclic, R2 to R9, R12 to R15, R17 to R28, R30 to R45, and R48 to R49 are each independently a hydrogen atom, a hydrocarbon group having a carbon number of 1 to 18, or an oxygen-containing hydrocarbon group containing an ether bond or an ester bond, the hydrocarbon group being saturated or unsaturated, aliphatic or aromatic, and being straight-chained, branched, or cyclic, a, b, c, e, f, g, j, k, w, and m each represent an integer of 0 to 20, d, h, and i each represent an integer of 1 to 6, (a+b) is 1 to 20, (e+f+g) is 0 to 20, and (j+k+w+m) is 0 to 20. ### Claim 2 (depends on 1) The lubricating oil composition for engine equipped with a forced-induction mechanism according to claim 1, wherein the sulfur content contained in the calcium-containing surfactant (b1) is 0.3 mass % or more on the basis of the whole amount of the calcium-containing surfactant (b1). ### Claim 3 (depends on 1) The lubricating oil composition for engine equipped with a forced-induction mechanism according to claim 1, wherein the metal-containing surfactant (B) further contains at least one selected from the group consisting of a magnesium-containing surfactant (b2) and a sodium-containing surfactant (b3). ### Claim 4 (depends on 1) The lubricating oil composition for engine equipped with a forced-induction mechanism according to claim 1, wherein the content of the basic compound (C) is from 0.10 to 1.00 mass % on the basis of the whole amount of the composition. ### Claim 5 (depends on 1) The lubricating oil composition for engine equipped with a forced-induction mechanism according to claim 1, wherein the basic compound (C) contains at least one selected from the group consisting of lithium carbonate, sodium carbonate, potassium carbonate, magnesium carbonate, calcium carbonate, barium carbonate, lithium hydroxide, sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, and barium hydroxide. ### Claim 6 (depends on 1) The lubricating oil composition for engine equipped with a forced-induction mechanism according to claim 1, wherein the sulfur content is from 0.01 to 0.80 mass % on the basis of the whole amount of the composition. ### Claim 7 (depends on 1) The lubricating oil composition for engine equipped with a forced-induction mechanism according to claim 1, wherein the calcium-containing surfactant (b1) is at least one of calcium phenate and calcium sulfonate. ### Claim 8 (depends on 1) A method for suppressing low-speed pre-ignition in an engine equipped with a forced-induction mechanism, the method comprising adding the lubricating oil composition for engine equipped with a forced-induction mechanism according to claim 1 to an engine equipped with a forced-induction mechanism. ### Claim 9 A method for producing a lubricating oil composition for engine equipped with a forced-induction mechanism, the method comprising a mixing step of mixing a base oil (A), a metal-containing surfactant (B) containing at least a calcium-containing surfactant (b1), and at least one basic compound (C) selected from the group consisting of a metal carbonate, a metal hydrogencarbonate, a metal hydroxide, and an amine-based compound, wherein the mixing step is performed so as to satisfy the following mixing conditions (1) to (3): (1) The sulfur content contained in the metal-containing surfactant (B) is 0.2 mass % or more on the basis of the whole amount of the metal-containing surfactant (B); (2) The content of a calcium atom is from 0.08 to 0.20 mass % on the basis of the whole amount of the composition; and (3) A mass ratio of the content of the basic compound (C) and the content of a calcium atom derived from the calcium-containing surfactant (b1) [(content of (C))/(calcium content derived from (b1))] is 2.0 or more; wherein the amine-based compound included for selection as the at least one basic compound (C) is selected from the group consisting of ammonia, a metal-free dithiocarbamate and an aliphatic amine-based compound selected from the group consisting of an amine compound (c1) having one or more hydroxy groups and one or more amino groups represented by the following general formulae (C1), (C2), (C3) and (C4); an amine compound (c2) having two or more amino groups represented by the general formula (C3) or (C4); and an amine compound (c3) having only one amino group represented by the general formula (C5), wherein R1, R10, R11, R16, R29, and R47 are each a hydrocarbon group having a carbon number of 1 to 32, and R10 and R11 may be the same as or different from each other, such hydrocarbon group being saturated or unsaturated, aliphatic or aromatic, and straight-chained, branched, or cyclic, R2 to R9, R12 to R15, R17 to R28, R30 to R45, and R48 to R49 are each independently a hydrogen atom, a hydrocarbon group having a carbon number of 1 to 18, or an oxygen-containing hydrocarbon group containing an ether bond or an ester bond, the hydrocarbon group being saturated or unsaturated, aliphatic or aromatic, and being straight-chained, branched, or cyclic, a, b, c, e, f, g, j, k, w, and m each represent an integer of 0 to 20, d, h, and i each represent an integer of 1 to 6, (a+b) is 1 to 20, (e+f+g) is 0 to 20, and (j+k+w+m) is 0 to 20.