# US 11,111,457 B2 · 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 11,111,457 B2 - Document ID: US11111457B2 - Status: Granted - Kind: B2 - Application number: 16/806,432 - Filed: 2020-03-02 - Published: 2020-06-25 - Granted: 2021-09-07 - Earliest claimed: 2016-02-25 - Assignees: Idemitsu Kosan Co., Ltd. - Applicants: Idemitsu Kosan Co., Ltd. - Inventors: Toshiaki Iwai - Web page: https://patentgrep.com/patent/US11111457B2 ## CPC - C10M 169/045: {the additives being a mixture of compounds of unknown or incompletely defined constitution and non-macromolecular compounds} - C10M 129/70: of monocarboxylic acids - C10M 133/06: having amino groups bound to acyclic or cycloaliphatic carbon atoms - C10M 133/12: having amino groups bound to a carbon atom of a six-membered aromatic ring - C10M 137/08: Ammonium or amine salts - C10M 141/10: at least one of them being an organic phosphorus-containing compound - C10M 159/00: Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution (carboxylic acids with less than 30 carbon atoms in the chain, of unknown or incompletely defined constitution C10M129/56) - C10M 2207/262: derived from hydroxy substituted aromatic acids, e.g. salicylates - C10M 2207/284: of aromatic monocarboxylic acids - C10M 2215/04: having amino groups bound to acyclic or cycloaliphatic carbon atoms - C10M 2215/06: having amino groups bound to carbon atoms of six-membered aromatic rings - C10M 2219/046: Overbased sulfonic acid salts - C10M 2223/04: Phosphate esters - C10M 2223/043: Ammonium or amine salts thereof - C10M 2223/049: Phosphite - 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 2030/76: {Reduction of noise, shudder, or vibrations} - C10N 2040/045: {for continuous variable transmission [CVT]} - 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 Disclosed is a lubricating oil composition capable of inhibiting vibrations or noises generated between a pulley and a chain or between a pulley and a belt in a CVT or the like, while increasing an intermetallic friction coefficient, the composition containing a base oil, an alkaline earth metal-based detergent (A), a phosphite ester (B1), a phosphate ester amine salt (B2), an acidic phosphate ester (B3), an aliphatic monoamine (C1), and an aromatic monoamine (C2). ## Claims ### Claim 1 A method to lubricate a continuously variable transmission (CVT), comprising: applying a lubricating oil composition between a pulley and a belt or between a pulley and a chain of the CVT; wherein the lubricating oil composition comprises: a base oil; (A) an alkaline earth metal-based detergent (A) having a base number of from 10 to 500 mgKOH/g as measured according to the perchloric acid method of JIS K-2501, wherein the amount of the alkaline earth metal atom derived from the alkaline earth metal-based detergent (A) is from 10 to 1,500 ppm by mass; (B1) 0.01 to 0.5% by mass of a phosphite ester (B1) represented by the following formula (I): (R1O)aP(OH)3-a (I) wherein R1 represents a hydrocarbon group having 2 to 24 carbon atoms; a represents an integer of 1 to 3; and when a is 2 or 3, R1's may be the same as or different from each other, (B2) 0.01 to 0.5% by mass of a phosphate ester amine salt (B2) which is an amine salt of an acidic phosphate ester represented by the following formula (II): (R2O)bP(═O)(OH)3-b (II) wherein R2 represents a hydrocarbon group having 2 to 24 carbon atoms; b represents an integer of 1 or 2; and when b is 2, R2's may be the same as or different from each other, (B3) 0.01 to 0.8% by mass of an acidic phosphate ester (B3) represented by the following formula (III): (R3O)cP(═O)(OH)3-c (III) wherein R3 represents a hydrocarbon group having 2 to 24 carbon atoms; c represents an integer of 1 or 2; and when c is 2, R3's may be the same as or different from each other, (C1) 0.01 to 0.8% by mass of an aliphatic monoamine (C1) represented by the following formula (IV): NR4R5R6 (IV) wherein R4 represents an aliphatic hydrocarbon group having 10 to 24 carbon atoms; R5 and R6 each represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and R5 and R6 may be the same as or different from each other, and (C2) 0.05 to 0.7% by mass of an aromatic monoamine (C2) represented by the following formula (V): NR7R8R9 (V) wherein R7 represents an aromatic hydrocarbon group having 6 to 12 carbon atoms; R8 and R9 each represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and R8 and R9 may be the same as or different from each other; and further wherein an intermetallic friction coefficient according to ASTM D2714 of the lubricating oil is 0.114 or more, wherein the test is run under the following conditions: Surface pressure: 0.8 GPa Oil temperature: 90° C. Average slipping velocity: 0.500 m/s Time: 30 minutes Surface pressure: 0.8 GPa Oil temperature: 90° C. Average slipping velocity: 0.500 m/s Steel-steel; and a ratio of intermetallic friction-coefficient/slipping-velocity according to ASTM D2714 of the lubricating oil is 1.03 or less wherein the test is run under the following conditions: Surface pressure: 0.8 GPa Oil temperature: 90° C. Average slipping velocity: 0.500 m/s Time: 30 minutes Surface pressure: 0.8 GPa Oil temperature: 90° C. Average slipping velocity: 0.025 m/s and 0.500 m/s Steel-steel μ Ratio=(Friction coefficient at 0.025 m/s)/(Friction coefficient at 0.500 m/s). ### Claim 2 (depends on 1) The method according to claim 1, wherein in the formula (I): a is 2, and R1 is an aliphatic hydrocarbon group having 8 to 20 carbon atoms. ### Claim 3 (depends on 1) The method according to claim 1, wherein in the formula (II), R2 is an aliphatic hydrocarbon group baying 8 to 2.0 carbon atoms. ### Claim 4 (depends on 1) The method according to claim 1, wherein in the formula (III), R3 is an aliphatic hydrocarbon group having 8 to 20 carbon atoms. ### Claim 5 (depends on 1) The method according to claim 1, wherein in the formula (IV): R4 is an aliphatic hydrocarbon group having 12 to 18 carbon atoms, and R5 and R6 are each a hydrogen atom or an alkyl group having 1 to 2 carbon atoms. ### Claim 6 (depends on 1) The method according to claim 1, wherein a sum total of the amounts of the phosphorus atom derived from the components (B1) to (B3) is from 10 to 1,000 ppm by mass on the basis of the whole amount of the lubricating oil composition. ### Claim 7 (depends on 1) The method according to claim 1, wherein a sum total of the amounts of the nitrogen atom derived from the components (C1) to (C2) is from 100 to 3,000 ppm by mass on the basis of the whole amount of the lubricating oil composition. ### Claim 8 (depends on 1) The method according to claim 1, wherein the CVT is a chain-type and the lubricating oil composition is applied between a pulley and a chain of the CVT.