US2025270465A1PendingUtilityA1

Diesel engine lubricating compositions and methods of use thereof

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Assignee: LUBRIZOL CORPPriority: Sep 22, 2020Filed: Sep 22, 2021Published: Aug 28, 2025
Est. expirySep 22, 2040(~14.2 yrs left)· nominal 20-yr term from priority
Inventors:Mary Galic RaguzThomas J. DerevjanikAlexandra MayhewJohn J. LoopPaul R. VincentBinbin Guo
C10M 2223/045C10M 2215/28C10M 2219/046C10M 2219/044C10M 2207/262C10M 2207/144C10M 2205/223C10M 2205/0285C10M 2203/1025C10M 169/04C10N 2010/04C10N 2020/04C10N 2030/54C10N 2030/06C10N 2040/252C10M 141/10
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Claims

Abstract

The instant disclosure provides for diesel engine lubricating compositions and methods of lubricating a diesel engine by supplying the engine with a lubricating composition as disclosed herein. The lubricating compositions disclosed herein include a total sulfated ash of between 0.3 to 1.1 wt. %; a kinematic viscosity at 100° C. of less than 8.3 cSt; a total alkaline earth metal soap of from 0.6 wt % to 2.1 wt %, and a HTHS measured according to ASTM D4683 of less than 2.7 mPa·s. The lubricating compositions may be used in diesel engines and, in particular, heavy-duty diesel engines to improve one or more of fuel economy and wear protection.

Claims

exact text as granted — not AI-modified
1 . A diesel engine lubricating composition comprising:
 an oil of lubricating viscosity having greater than 50 weight percent of a Group III base oil, a Group IV base oil, a Group V base oil, or mixtures thereof;   a first PIB succinimide dispersant derived from an 1800 to 2500 Mn PIB;   a second PIB succinimide dispersant derived from a PIB with an Mn less than 1600, where at least one of the first PIB succinimide dispersant and the second PIB succinimide dispersant is boron-free;   an alkaline earth metal salicylate detergent;   an alkaline earth metal sulfonate detergent present in an amount to deliver 0.1 wt % to 1.2 wt % of alkaline earth metal soap to the lubricating composition; and   a phosphorus antiwear agent present in an amount to deliver 300 to 900 ppm phosphorous to the lubricating composition,   the lubricating composition having a total sulfated ash of between 0.3 to 1.1 wt. %; a kinematic viscosity at 100° C. of less than 8.3 cSt; a total alkaline earth metal soap of from 0.6 wt % to 2.1 wt %, and a HTHS measured according to ASTM D4683 of less than 2.7 mPa·s.   
     
     
         2 . The composition of  claim 1 , wherein the first PIB succinimide dispersant has a TBN (KOH/g) of from 15 to 25. 
     
     
         3 . The composition of  claim 1 , wherein the first PIB succinimide dispersant has a TBN (KOH/g of from 15 to 20. 
     
     
         4 . The composition of  claim 1 , wherein the PIB of the first PIB succinimide dispersant has a number average molecular weight of from 1750 to 2200 Mn. 
     
     
         5 . The composition of  claim 1 , wherein the PIB of the first PIB succinimide dispersant has a number average molecular weight of from 1800 to 2100 Mn. 
     
     
         6 . The composition of  claim 1 , wherein the PIB of the first PIB succinimide dispersant has a number average molecular weight of from 1850 to 2150 Mn. 
     
     
         7 . The composition of  claim 1 , wherein the first PIB succinimide dispersant is present in the lubricating composition in an amount of from 0.5 wt % to 10 wt %. 
     
     
         8 . The composition of  claim 1 , wherein the first PIB succinimide dispersant is present in the lubricating composition in an amount of from 0.8 wt % to 6 wt %. 
     
     
         9 . The composition of  claim 1 , wherein the first PIB succinimide dispersant is present in the lubricating composition in an amount of from 1 wt % to 5 wt %. 
     
     
         10 . The composition of  claim 1 , wherein the first PIB succinimide dispersant is present in the lubricating composition in an amount of from 1.5 wt % to 5 wt %. 
     
     
         11 . The composition of  claim 1 , wherein the first PIB succinimide dispersant is prepared by a thermal direct alkylation process. 
     
     
         12 . The composition of  claim 1 , wherein the first PIB succinimide dispersant comprises a mixture of two dispersants. 
     
     
         13 . The composition of  claim 1 , wherein the second PIB succinimide dispersant is derived from a PIB having a number average molecular weight of from 750 to 1600. 
     
     
         14 . The composition of  claim 1 , wherein the second PIB succinimide dispersant is derived from a PIB having a number average molecular weight of from 1000 to 1600. 
     
     
         15 . The composition of  claim 1 , wherein the second PIB succinimide dispersant is derived from a PIB having a number average molecular weight of from 1200 to 1600. 
     
     
         16 . The composition of  claim 13 , wherein the second PIB succinimide dispersant is derived from a PIB having a number average molecular weight of from 800 to 1150. 
     
     
         17 . The composition of  claim 13 , wherein the second PIB succinimide dispersant is derived from a PIB having a number average molecular weight of from 900 to 1100. 
     
     
         18 . The composition of  claim 1 , wherein the second PIB succinimide dispersant is prepared by a thermal direct alkylation process. 
     
     
         19 . The composition  claim 1 , wherein the second PIB succinimide dispersant is present in the lubricating composition in an amount of from 1 to 5 wt %, or from 1.5 to 4.8 wt %, or from 1.8 to 4.6 wt %, or from 1.9 to 4.6 wt %. 
     
     
         20 . The composition of  claim 1 , wherein the second PIB succinimide dispersant comprises from 1 to 5 wt % of a PIB succinimide dispersant derived from a PIB having an Mn of from 900 to 1100 and from 1 to 5 wt % of a PIB succinimide dispersant derived from a PIB having an Mn of from 1200 to 1600. 
     
     
         21 . The composition of  claim 1 , wherein the second PIB succinimide dispersant has a TBN (KOH/g) of 20 to 35. 
     
     
         22 . The composition of  claim 1 , wherein the second PIB succinimide dispersant has a TBN (KOH/g) of 25 to 30. 
     
     
         23 . The composition of  claim 1 , wherein the second PIB succinimide dispersant has a TBN (KOH/g) of 27 to 28. 
     
     
         24 . The composition of  claim 1 , wherein the first PIB succinimide dispersant is borated. 
     
     
         25 . The composition of  claim 1 , wherein the second PIB succinimide dispersant is borated. 
     
     
         26 . The composition of  claim 24 , wherein the first borated dispersant and second borated dispersant is present in an amount to deliver independently 25 to 400 (or 50 to 200) ppm boron by weight to the lubricating composition. 
     
     
         27 . The composition of  claim 1 , wherein the alkaline earth metal salicylate detergent has a TBN (KOH/g) of from 200 to 575 or 200 to 500. 
     
     
         28 . The composition of  claim 1 , wherein the alkaline earth metal salicylate is a calcium salicylate detergent having a TBN (KOH/g) of from 250 to 350. 
     
     
         29 . The composition of  claim 1 , wherein the alkaline earth metal salicylate detergent has a metal ratio of from 2 to 7, or 2 to 4, or 2.5 to 3.5. 
     
     
         30 . The composition of  claim 1 , wherein the alkaline earth metal sulfonate detergent is selected from a calcium sulfonate detergent and a magnesium sulfonate detergent. 
     
     
         31 . The composition of  claim 1 , wherein the alkaline earth metal sulfonate detergent is a calcium sulfonate detergent. 
     
     
         32 . The composition of  claim 31 , wherein the calcium sulfonate detergent has a TBN (KOH/g) of less than 200. 
     
     
         33 . The composition of  claim 31 , wherein the calcium sulfonate detergent has a TBN (KOH/g) of less than 150, or less than 100, or less than 80. 
     
     
         34 . The composition of  claim 31 , wherein the calcium sulfonate detergent has a TBN (KOH/g) of from 50 to 90. 
     
     
         35 . The composition of  claim 31 , wherein the calcium sulfonate detergent is present in the lubricant composition in an amount of from 0.5 wt % to 2.0 wt %, or 0.6 wt % to 1.5 wt %. 
     
     
         36 . The composition of  claim 1 , wherein the alkaline earth metal sulfonate detergent is an overbased magnesium sulfonate detergent. 
     
     
         37 . The composition of  claim 1 , wherein the overbased magnesium sulfonate detergent as a TBN (KOH/g) of 200 to 500, or 250 to 400, or 250 to 350, or 350 to 375. 
     
     
         38 . The composition of  claim 1 , wherein the overbased magnesium sulfonate detergent is present in the lubricating composition in an amount of from 0.05 wt % to 0.2 wt %, or 0.06 wt % to 0.1. 
     
     
         39 . The composition of  claim 1 , wherein the alkaline earth metal sulfonate comprises a mixture of 0.6 wt % to 1.5 wt % of a calcium sulfonate detergent having a TBN (KOH/g) of from 50 to 100 and 0.05 wt % to 0.1 wt % of an overbased magnesium sulfonate detergent having a TBN (KOH/g) of from 250 to 350. 
     
     
         40 . The composition of  claim 1 , wherein the total alkaline earth metal soap of the lubricating composition is from 0.6 wt % to 1.5 wt % or 0.7 wt % to 1.4. 
     
     
         41 . The composition of  claim 1 , wherein the phosphorus antiwear agent is a zinc dialkyldithiophosphate in an amount to deliver from 400 ppm to 850 ppm, or 450 ppm to 800 ppm, or 500 ppm to 800 ppm, or 550 ppm to 780 ppm, or 650 ppm to 780 ppm to the lubricating composition. 
     
     
         42 . The composition of  claim 1 , wherein the total sulfated ash is between 0.3 to 0.9 wt % or 0.4 to 0.8 wt %. 
     
     
         43 . The composition of  claim 1 , wherein the HTHS is less than 2.5, or less than 2.3, or less than 2.1. 
     
     
         44 . The composition of  claim 1 , wherein the HTHS is from 1.4 to 2.5, or 1.6 to 2.1, or 1.8 to 2.1, or 1.9 to 2.0. 
     
     
         45 . The composition of  claim 1 , further comprising an ashless friction modifier. 
     
     
         46 . The composition of  claim 1 , further comprising a dispersant other than the first PIB succinimide dispersant and the second PIB succinimide dispersant. 
     
     
         47 . The composition of  claim 1 , further comprising one or more additional additives selected from an antioxidant, a foam inhibitor, and a corrosion inhibitor. 
     
     
         48 . The compositions of  claim 1 , wherein the kinematic viscosity at 100° C. is from 2.5 to 8.3 cSt or 3.5 to 6.5 cSt. 
     
     
         49 . A method of lubricating a diesel engine comprising supplying to the engine a lubricant composition according to  claim 1 . 
     
     
         50 . (canceled)

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