US2012145114A1PendingUtilityA1

Lubricating oil composition

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Assignee: NELSON KENNETH DPriority: Dec 17, 2008Filed: Feb 17, 2012Published: Jun 14, 2012
Est. expiryDec 17, 2028(~2.4 yrs left)· nominal 20-yr term from priority
Inventors:Kenneth D. NelsonAlexander B. BoffaWilliam M. KleiserStephen D. StultsJames A. McgeehanWim Van DamRichard E. Cherpeck
C10N 2040/252C10N 2060/14C10N 2040/25C10N 2030/45C10N 2030/43C10N 2030/42C10N 2040/255C10M 2215/064C10M 2219/044C10M 2219/068C10M 2215/28C10M 2227/09C10M 2203/1006C10M 2219/046C10M 2215/08C10M 2201/087C10M 2227/062C10M 2207/042C10M 141/12C10M 2219/066C10M 163/00C10M 2207/026C10M 2227/061C10M 2219/102
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Claims

Abstract

A lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 is disclosed which comprises (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound having no more than about 400 ppm of boron; and (c) at least one oil-soluble or dispersed oil-stable molybdenum-containing compound having, at least about 1100 ppm of molybdenum, based upon the total mass of the composition; wherein the lubricating oil composition has a ratio of sulfur to molybdenum of less than or equal to about 4:1.

Claims

exact text as granted — not AI-modified
1 . A lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 and comprising (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound having from about 40 ppm to no more than about 400 ppm of boron, based upon the total mass of the composition; and (c) at least one oil-soluble or dispersed oil-stable molybdenum-containing compound having at least about 1100 ppm of molybdenum, based upon the total mass of the composition; wherein the lubricating oil composition has a ratio of sulfur to molybdenum of about 0.5:1 to less than or equal to about 4:1. 
     
     
         2 . The lubricating oil composition of  claim 1 , wherein the oil of lubricating viscosity is comprised of a mineral base oil. 
     
     
         3 .- 4 . (canceled) 
     
     
         5 . The lubricating oil composition of  claim 1 , having a ratio of sulfur to molybdenum of less than about 3:1. 
     
     
         6 .- 8 . (canceled) 
     
     
         9 . The lubricating oil composition of  claim 1 , having a ratio of sulfur to molybdenum of about 1:1 to about 2.5:1. 
     
     
         10 . The lubricating oil composition of  claim 1 , wherein the oil-soluble or dispersed oil-stable molybdenum compound is selected from the group consisting of a sulfurized or non-sulfurized molybdenum polyisobutenyl succinimide complex, molybdenum dithiocarbamate, dispersed hydrated molybdenum compound, acidic molybdenum compound or a salt thereof and mixtures thereof. 
     
     
         11 . (canceled) 
     
     
         12 . The lubricating oil composition of  claim 1 , wherein the oil-soluble or dispersed oil-stable molybdenum compound is a molybdenum dithiocarbamate. 
     
     
         13 . The lubricating oil composition of  claim 1 , wherein the oil-soluble or dispersed oil-stable molybdenum compound is a sulfurized or non-sulfurized molybdenum polyisobutenyl succinimide complex. 
     
     
         14 . The lubricating oil composition of  claim 1 , wherein the sulfur is derived from a compound selected from the group consisting of a polyisobutyl dithiothione, ashless dithiocarbamate and mixtures thereof. 
     
     
         15 . The lubricating oil composition of  claim 1  wherein the sulfur is derived from a bisdithiocarbamate compound of the Formula: 
       
         
           
           
               
               
           
         
       
       wherein R 13 , R 14 , R 15 , and R 16  are the same or different and are aliphatic hydrocarbyl groups having 1 to 13 carbon atoms and R 17  is an alkylene group having 1 to 8 carbon atoms. 
     
     
         16 . (canceled) 
     
     
         17 . The lubricating oil composition of  claim 1 , having a sulfated ash content of up to about 0.4 wt. % as determined by ASTM D874. 
     
     
         18 . The lubricating oil composition of  claim 1 , which is substantially free of phosphorus. 
     
     
         19 . The lubricating oil composition of  claim 1 , which is substantially free of zinc dialkyl dithiophosphate. 
     
     
         20 . The lubricating oil composition of  claim 1 , further comprising at least one additive selected from the group consisting of metallic detergents, ashless dispersants, friction modifiers, extreme pressure agents, viscosity index improvers and pour point depressants. 
     
     
         21 . A method of operating an internal combustion engine comprising the step of operating the internal combustion engine with a lubricating oil composition having a sulfur content of up to about 0.4 wt. % and a sulfated ash content of up to about 0.5 wt. % as determined by ASTM D874 and comprising (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound having from about 40 ppm to no more than about 400 ppm of boron, based upon the total mass of the composition; and (c) at least one oil-soluble or dispersed oil-stable molybdenum-containing compound having at least about 1100 ppm of molybdenum, based upon the total mass of the composition; wherein the lubricating oil composition has a ratio of sulfur to molybdenum of about 0.5:1 to less than or equal to about 4:1. 
     
     
         22 - 27 . (canceled) 
     
     
         28 . The method of  claim 21 , wherein the lubricating oil composition has a ratio of sulfur to molybdenum of about 1:1 to about 2.5:1. 
     
     
         29 . The method of  claim 21 , wherein the oil-soluble or dispersed oil-stable molybdenum compound of the lubricating oil composition is selected from the group consisting of a sulfurized or non-sulfurized molybdenum polyisobutenyl succinimide complex, molybdenum dithiocarbamate, dispersed hydrated molybdenum compound, acidic molybdenum compound or a salt thereof and mixtures thereof. 
     
     
         30 . The method of  claim 21 , wherein the sulfur of the lubricating oil composition is derived from a compound selected from the group consisting of an alkyl or alkenyl sulfide, polyisobutyl dithiothione, ashless dithiocarbamate and mixtures thereof. 
     
     
         31 . (canceled) 
     
     
         32 . The method of  claim 21 , wherein the sulfur of the lubricating oil composition is derived from a bisdithiocarbamate compound of the Formula: 
       
         
           
           
               
               
           
         
       
       wherein R 13 , R 14 , R 15 , and R 16  are the same or different and are aliphatic hydrocarbyl groups having 1 to 13 carbon atoms and R 17  is an alkylene group having 1 to 8 carbon atoms. 
     
     
         33 . (canceled) 
     
     
         34 . The method of  claim 21 , wherein the lubricating oil composition has a sulfated ash content of up to about 0.4 wt. % as determined by ASTM D874. 
     
     
         35 . The method of  claim 21 , wherein the lubricating oil composition is substantially free of phosphorus. 
     
     
         36 . The method of  claim 21 , wherein the lubricating oil composition is substantially free of zinc dialkyl dithiophosphate. 
     
     
         37 . An internal combustion engine lubricated with the lubricating oil composition of  claim 1 . 
     
     
         38 .- 39 . (canceled)

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