# US 6,720,294 B1 · Lubricating oil compositions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,720,294 B1 - Document ID: US6720294B1 - Status: Granted - Kind: B1 - Application number: 09/300,191 - Filed: 1999-04-27 - Granted: 2004-04-13 - Earliest claimed: 1999-04-27 - Assignees: Infineum USA L.P. - Inventors: Malcolm Willars; Peter Sant - Web page: https://patentgrep.com/patent/US6720294B1 ## CPC - C10M 163/00: Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential - C10M 129/10: having hydroxy groups bound to a carbon atom of a six-membered aromatic ring - C10M 129/54: containing hydroxy groups - C10M 133/12: having amino groups bound to a carbon atom of a six-membered aromatic ring - C10M 135/10: Sulfonic acids or derivatives thereof - C10M 159/20: Reaction mixtures having an excess of neutralising base, e.g. so-called overbasic or highly basic products - C10M 159/22: containing phenol radicals - C10M 159/24: containing sulfonic radicals - C10M 2207/023: having hydroxy groups bound to carbon atoms of six-membered aromatic rings - C10M 2207/026: with tertiary alkyl groups - C10M 2207/027: Neutral salts thereof - C10M 2207/028: Overbased salts thereof - C10M 2207/26: Overbased carboxylic acid salts - C10M 2207/262: derived from hydroxy substituted aromatic acids, e.g. salicylates - C10M 2215/06: having amino groups bound to carbon atoms of six-membered aromatic rings - C10M 2215/064: Di- and triaryl amines - C10M 2215/065: Phenyl-Naphthyl amines - C10M 2215/066: Arylene diamines - C10M 2215/067: Polyaryl amine alkanes - C10M 2215/068: having amino groups bound to polycyclic aromatic ring systems, i.e. systems with three or more condensed rings - C10M 2219/046: Overbased sulfonic acid salts - C10M 2219/089: Overbased salts - 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) ## Abstract A lubricating oil composition comprising, as a detergent, metal salt of a long chain hydrocarbyl-substituted organic acid, at a concentration of not more than 15 mmol/kg oil. ## Claims ### Claim 1 A heavy duty diesel lubricating oil composition comprising, as a detergent, one or more overbased metal salts of long chain hydrocarbyl-substituted organic acids selected from the group consisting of aromatic carboxylic acids, sulfonic acids and phenol derivatives, the total concentration of said metal salts being not more than 15 mmol/kg of the composition, provided that the composition is not an SAE 5 W composition whose base stock comprises less than 10 wt. % non-conventional lubricant. ### Claim 2 A lubricating oil composition comprising, as a detergent, one or more overbased metal salts of long chain hydrocarbyl-substituted acids selected from the group consisting of aromatic carboxylic acids or phenol derivatives, the total concentration of said metal salts being not more than 15 mmol/kg of the composition, provided that the composition is not an SAE 5 W composition whose base stock comprises less than 10 wt. % non-conventional lubricant. ### Claim 3 (depends on 1) The composition as claimed in claim 1 wherein the concentration is between 5 and 15 mmol/kg of the composition. ### Claim 4 (depends on 3) The composition as claimed in claim 3 wherein the metal salt is a calcium alkyl salicylate. ### Claim 5 (depends on 1) The composition as claimed in claim 1 wherein the carboxylic acid is a C14-24 alkyl salicylic acid. ### Claim 6 (depends on 1) The composition as claimed in claim 1 further comprising an anti-oxidant selected from the group consisting of an aminic anti-oxidant and a phenolic anti-oxidant. ### Claim 7 (depends on 6) The composition as claimed in claim 6 wherein the anti-oxidant is a tertiary C4-12 alkyl diphenylamine. ### Claim 8 (depends on 6) The composition as claimed in claim 6 wherein the anti-oxidant is a 2,6-ditertiary-butyl-4-(2-carboxy(alkyl)ethyl) phenol. ### Claim 9 (depends on 1) The composition as claimed in claim 1 wherein the detergent has a metal:metal salt ratio of between 1 to 10. ### Claim 10 (depends on 1) The composition as claimed in claim 1 comprising a base stock in the form of a mineral oil base stock containing greater than 85% of saturates, as measured by ASTM method D2007. ### Claim 11 (depends on 1) The composition as claimed in claim 1 further comprising a dispersant at a concentration of 3 to 10 mass % based on the mass of the composition. ### Claim 12 (depends on 1) The composition as claimed in claim 1 free of a magnesium salt detergent. ### Claim 13 (depends on 1) A method of lubricating a diesel engine which comprises supplying to the engine a lubricating oil composition as claimed in claim 1. ### Claim 14 (depends on 1) A method of alleviating viscosity increase in a lubricating oil composition due to the presence of increasing levels of soot when the composition is lubricating a diesel engine, which comprises lubricating the diesel engine with a lubricating oil composition as claimed in claim 1. ### Claim 15 (depends on 2) A method of lubricating a diesel engine which comprises supplying to the engine a lubricating oil composition as claimed in claim 2. ### Claim 16 (depends on 1) A lubricating oil composition as claimed in claim 1 wherein the concentration is between 8 and 13 mmol/kg of the composition. ### Claim 17 (depends on 2) A lubricating oil composition as claimed in claim 2 wherein the concentration is between 8 and 13 mmol/kg of the composition.