US2016326452A1PendingUtilityA1

Method of lubricating an internal combustion engine

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Assignee: LUBRIZOL CORPPriority: Jan 10, 2014Filed: Jan 9, 2015Published: Nov 10, 2016
Est. expiryJan 10, 2034(~7.5 yrs left)· nominal 20-yr term from priority
Inventors:Mary Galic RaguzJohn G. Loop
C10N 2020/04C10M 2205/022C10N 2030/43C10M 2215/064C10M 2207/028C10M 163/00C10M 2217/06C10M 167/00C10M 2219/082C10N 2010/04C10N 2030/52C10M 2219/089C10N 2030/45C10N 2030/06C10M 2207/026C10M 2215/086C10N 2030/04C10N 2030/42C10M 2223/045C10N 2040/252C10M 2219/046C10M 2207/262C10M 2219/044C10M 161/00C10M 2219/087C10M 2219/088C10N 2230/06C10N 2230/52C10N 2220/021C10N 2240/102C10N 2230/45C10N 2230/43C10N 2230/04C10N 2230/42
38
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Claims

Abstract

The invention provides a method of lubricating a compression-ignition internal combustion engine with a maximum laden mass over 2,700 kg comprising supplying to the engine a lubricating composition comprising: an oil of lubricating viscosity, 1.5 wt % to 10 wt % of an ashless dispersant, a 300 TBN or higher alkaline earth metal sulphonate detergent having a metal ratio of 10 to 40, and a 80 TBN or lower alkaline earth metal sulphonate detergent having a metal ratio of 1 to 5, wherein the lubricating composition comprises 0 wt % to 0.2 wt % of a phenolic based detergent, the ratio of higher alkaline earth metal sulphonate detergent to lower alkaline earth metal sulphonate detergent is 80:20 to 20:80, the total amount of soap delivered by the calcium sulphonate detergents is 0.4 wt % to 1.5 wt % of the lubricating composition, and the lubricating composition has a sulphated ash content of not more than 1.5 wt %.

Claims

exact text as granted — not AI-modified
1 - 45 . (canceled) 
     
     
         46 . A method of lubricating a compression-ignition internal combustion engine with a maximum laden mass over 2,700 kg comprising supplying to the engine a lubricating composition comprising:
 an oil of lubricating viscosity,   1.5 wt % to 10 wt % of an ashless dispersant,   a 300 TBN or higher alkaline earth metal sulphonate detergent having a metal ratio of 10 to 40, wherein the 300 TBN or higher alkaline earth metal sulphonate detergent comprises a magnesium sulphonate detergent,   a 80 TBN or lower alkaline earth metal sulphonate detergent having a metal ratio of 1 to 5, wherein the 80 TBN or lower alkaline earth metal sulphonate detergent comprises a calcium sulphonate detergent,   
       wherein the lubricating composition comprises 0 wt % to 0.2 wt % of a phenolic based detergent, the ratio of 300 TBN or higher alkaline earth metal sulphonate detergent to 80 TBN or lower alkaline earth metal sulphonate detergent is 80:20 to 20:80, 
       the total amount of soap delivered by the calcium sulphonate detergents is 0.4 wt % to 1.5 wt % of the lubricating composition, and 
       the lubricating composition has a sulphated ash content of not more than 1.5 wt %. 
     
     
         47 . The method of  claim 46 , wherein the lubricating composition is characterised as having (i) a sulphur content of 0.5 wt % or less, (ii) a phosphorus content of 0.1 wt % or less, and (iii) a sulphated ash content of 0.5 wt % to 1.5 wt %. 
     
     
         48 . The method of  claim 46 , wherein the lubricating composition is characterised as having at least one of (i) a sulphur content of 0.2 wt % to 0.4 wt %, (ii) a phosphorus content of 0.08 wt % to 0.15 wt %, and (iii) a sulphated ash content of 0.5 wt % to 1.5 wt %. 
     
     
         49 . The method of  claim 48 , wherein the lubricating composition is characterised as having a sulphated ash content of 0.5 wt % to 1.2 wt %. 
     
     
         50 . The method of  claim 46 , wherein the lubricating composition is characterized as having a total base number (TBN) content of at least 5 mg KOH/g. 
     
     
         51 . The method of  claim 50 , wherein the lubricating composition is characterized as having a total base number (TBN) content of 7 to 10 mg KOH/g. 
     
     
         52 . The method of  claim 46 , wherein the total amount of soap delivered by the sulphonate detergents is 0.4 wt % to 1 wt % of the lubricating composition. 
     
     
         53 . The method of  claim 46 , wherein the ratio of 300 TBN or higher alkaline earth metal sulphonate detergent to 80 TBN or lower alkaline earth metal sulphonate detergent is 70:30 to 30:70. 
     
     
         54 . The method of  claim 46 , wherein the metal ratio of the 300 TBN or higher alkaline earth metal sulphonate detergent is 20 to 30. 
     
     
         55 . The method of  claim 46 , wherein the 300 TBN or higher alkaline earth metal sulphonate detergent has a TBN of 350 to 500. 
     
     
         56 . The method of  claim 46 , wherein the 80 TBN or lower alkaline earth metal sulphonate detergent has a metal ratio of 1 to 3. 
     
     
         57 . The method of  claim 46 , wherein the 80 TBN or lower alkaline earth metal sulphonate detergent has a TBN of 2 to 40. 
     
     
         58 . The method of  claim 46 , wherein the 300 TBN or higher alkaline earth metal sulphonate detergent comprises a mixture of a calcium sulphonate detergent having a metal ratio of 10 to 40, and the magnesium sulphonate detergent having a metal ratio of 10 to 40. 
     
     
         59 . The method of  claim 58 , wherein the 300 TBN or higher alkaline earth metal sulphonate detergent mixture comprises a calcium sulphonate detergent having a metal ratio of 16 to 20, and a magnesium sulphonate detergent having a metal ratio of 12 to 40. 
     
     
         60 . The method of  claim 58 , wherein the 300 TBN or higher alkaline earth metal sulphonate detergent mixture comprises a calcium sulphonate detergent having a metal ratio of 22 to 25, and a magnesium sulphonate detergent having a metal ratio of 14 to 25. 
     
     
         61 . The method of  claim 46 , wherein the lubricating composition comprises up to 0.1 wt % of a phenolic based detergent. 
     
     
         62 . The method of  claim 46 , wherein the lubricating composition comprises 0 wt % of a phenolic based detergent. 
     
     
         63 . The method of  claim 46 , wherein the lubricating composition further comprises a dispersant viscosity modifier. 
     
     
         64 . The method of  claim 63 , wherein the dispersant viscosity modifier is present at 0.01 wt % to 3 wt %. 
     
     
         65 . The method of  claim 63 , wherein the dispersant viscosity modifier is an olefin copolymer further functionalised with a dispersant amine group. 
     
     
         66 . The method of  claim 65 , wherein the olefin copolymer is an ethylene-propylene copolymer. 
     
     
         67 . The method of  claim 65 , wherein the olefin copolymer has a number average molecular weight of 5000 to 100,000. 
     
     
         68 . The method of  claim 65 , wherein the dispersant amine group is derived from reacting the olefin copolymer with an acylating agent and an aromatic amine having a primary or secondary amino group. 
     
     
         69 . The method of  claim 68 , wherein the aromatic amine is selected from the group consisting of 4-aminodiphenylamine, aldehyde (typically formaldehyde) coupled 4-aminodiphenylamine, nitro-aniline, disperse orange-3 (DO3), or mixtures thereof. 
     
     
         70 . The method of  claim 63 , wherein the dispersant viscosity modifier is present at 0.1 wt % to 1 wt %. 
     
     
         71 . The method of  claim 46 , wherein the lubricating composition further comprises an antioxidant, wherein the antioxidant comprises a phenolic or an aminic antioxidant or mixtures thereof, and wherein the antioxidant is present at 0.1 wt % to 3 wt %. 
     
     
         72 . The method of  claim 46  further comprising a phosphorus-containing antiwear agent. 
     
     
         73 . The method of  claim 46 , wherein the ashless dispersant has a TBN on an oil free basis of 50 to 130. 
     
     
         74 . The method of  claim 46 , wherein the ashless dispersant comprises a succinimide dispersant, wherein the succinimide dispersant is present at 2.5 wt % to 6 wt %. 
     
     
         75 . The method of  claim 74 , wherein the succinimide dispersant comprises a polyisobutylene succinimide, wherein the polyisobutylene from which polyisobutylene succinimide is derived has a number average molecular weight of 350 to 5000. 
     
     
         76 . The method of  claim 75 , wherein the polyisobutylene succinimide has a carbonyl to nitrogen ratio of 1:1 to 1:5. 
     
     
         77 . The method of  claim 46 , wherein the ashless dispersant comprises a dispersant package of two or more dispersants. 
     
     
         78 . The method of  claim 77 , wherein the dispersant package comprises:
 0.1 wt % to 4 wt % with respect to the lubricating composition of a borated polyisobutylene succinimide dispersant, wherein the polyisobutylene from which the borated polyisobutylene succinimide is derived has a number average molecular weight of 550 to 1150, and   0.1 wt % to 6 wt % with respect to the lubricating composition of a polyisobutylene succinimide, wherein the polyisobutylene from which polyisobutylene succinimide is derived has a number average molecular weight of 350 to 5000.   
     
     
         79 . The method of  claim 78 , wherein the polyisobutylene succinimide is derived from a polyisobutylene having a number average molecular weight of 1550 to 2500 and is present at 0.1 to 2 wt %.

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