Low SAP engine lubricant additive and composition containing non-corrosive sulfur and organic borates

Abstract

The present invention is directed to a lubricating oil composition comprising a lubricating oil basestock, a boron-containing additive of at least 0.1 weight percent of the composition and less than 8.0 weight percent, and ashless sulfur additive of at least 0.1 weight percent of the composition and less than 4.0 weight percent, a dispersant-detergent-inhibitor system of less than 15 percent weight percent of the composition, a zinc dithiophosphate additive of at least 0.2 weight percent of the composition and less than 2.0 weight percent of the composition. The elements in the formulated oil composition having at least 100 and less than 630 PPM phosphorus, at least 1,000 PPM and less than 3,000 PPM, at least 100 and less than 630 ppm Phosphorous, and at least 105 PPM and less than 710 PPM zinc. In a second embodiment, an additive composition for lubricating oils is disclosed. In a third embodiment, a method to obtain favorable lubricating properties is disclosed.

1 . A composition, comprising:
 a. a lubricating oil basestock;   b. an organic boron containing additive present in an amount of at least 0.01 and less than 8.0 weight percent of the composition;   c. a dispersant-detergent-inhibitor system of less than 15 weight percent of the composition;   d. a non-corrosive ashless sulfur additive present in an amount of at least 0.1 and less than 4.0 weight percent of the composition;   e. a zinc dithiophosphate additive present in an amount of at least 0.2 weight percent of the composition and less than 2.0 weight percent of the composition; and   f. the composition having at least 100 PPM and less than 630 PPM phosphorus, at least 105 PPM and less than 710 PPM zinc, at least 1,000 PPM and less than 3,000 PPM sulfur, at least 80 PPM and less than 450 PPM Boron.   
     
     
         2 . The composition of  claim 1  further comprising at least one performance additive wherein the additives are chosen form the group comprising zinc dithiophosphates, borated or non-borated dispersants, phenolic and aminic ashless anti-oxidants, metal detergents, molybdenum or organic friction modifiers, defoamants, seal swell additives, pour point depressants and others including contemporary dispersant-detergent-inhibitor (DDI) additive packages, and any combination thereof. 
     
     
         3 . The composition of  claim 1  wherein the base stock is chosen from the group consisting of group II base stocks, group III base stocks, group IV base stocks, and group V base stocks, gas-to-liquids base stocks, and any combination thereof. 
     
     
         4 . The composition of  claim 1  wherein the dispersant systems comprises additives chosen from the group consisting of borated and non-borated succinimides, succinic acid-esters and amides, alkylphenol-polyamine coupled Mannich adducts, and any combination thereof. 
     
     
         5 . The composition of  claim 1  further comprising an ashless antioxidant additive. 
     
     
         6 . The composition of  claim 1  further comprising a metallic detergent or detergent system. 
     
     
         7 . The composition of  claim 6  wherein the detergent system provides a total base number (TBN) less than 9, preferably less than 7 and most preferably less than 5, to the formulated lubricant composition. 
     
     
         8 . The composition of  claim 1  further comprising a viscosity modifier additive. 
     
     
         9 . The composition of  claim 1  wherein the organic borate is a borated hydroxyl esters chosen from the group consisting of borated glycerol mono-oleate, borated glycerol di-oleate, borated glycerol tri-oleate, borated glycerol mono-cocoate, borated mono-talloate, borated glycerol mono-sorbitate, borated polyol esters and any combination thereof 
     
     
         10 . The composition of  claim 1  wherein the non corrosive sulfur additive is chosen from the group consisting of ashless derivatives of thiadiazoles, ashless derivatives of benzothiazoles, ashless alkyl, aryl sulfides/di-sulfides/tri-sulfide including thianthrene, diphenyl disulfide, dinonyl disulfide, dipyridyl disulfide, and their alkylates, ashless dithiocarbamates, thioesters/sulfurized esters, thioglycolates, dialkyl thiodipropionates, dialkyl dithiopropionates, and any combination thereof. 
     
     
         11 . The composition of  claim 10  wherein the non-corrosive, organic sulfur additive is a sulfur/nitrogen containing, heterocyclic or non-heterocyclic antiwear-antioxidant additive. 
     
     
         12 . The composition of  claim 11  wherein the non-corrosive, organic sulfur additive is an ashless dithiocarbamate additive. 
     
     
         13 . The composition of  claim 11  wherein the non-corrosive, organic sulfur additive is thiadiazole-derived antiwear additive. 
     
     
         14 . A lubricant additive system for a lubricant composition, comprising:
 a. an organic boron containing additive of at least 0.4 weight percent and less than 32 weight percent of the additive;   b. a detergent-dispersant system of less than 60 percent weight percent of the additive;   c. a zinc dithiophosphate additive of at least 0.8 weight percent of the composition and less than 8.0 weight percent of the additive; and   d. a non-corrosive ashless sulfur additive of at least 0.4 and less than 16.0 weight percent of the additive.   
     
     
         15 . The lubricant additive of  claim 14  wherein the total lubricant additive treat is in the range of at least 0.1 weight percent to 25 weight percent of the lubricant composition. 
     
     
         16 . The lubricant additive of  claim 14  further comprising a molybdenum additive. 
     
     
         17 . The lubricant additive of  claim 16  wherein the molybdenum additive is an organic molybdenum additive. 
     
     
         18 . The lubricant additive of  claim 14  wherein the zinc dithiophosphate additive comprises a primary alkyl alcohol derived, or a secondary alkyl alcohol derived zinc dithiophosphate or a combination thereof. 
     
     
         19 . A method comprising
 a. obtaining a composition comprising a lubricating oil basestock, an organic boron containing additive present in the amount of at least 0.1 and less than 8 weight percent of the composition, a dispersant-detergent-inhibitor system of less than 15 percent weight percent of the composition, a zinc dithiophosphate additive present in the amount of at least 0.2 weight percent of the composition and less than 2.0, weight percent of the composition, a non corrosive ashless sulfur additive present in the amount of at least 0.1 and less than 4.0 weight percent of the composition wherein the composition has at least 100 PPM and less than 630 PPM phosphorus, at least 105 PPM and less than 710 PPM zinc, at least 1,000 PPM and less than 30,000 PPM sulfur, at least 80 PPM and less than 450 PPM Boron; and   b. lubricating an engine with the composition to achieve favorable anti-wear, oxidation and cleanliness.   
     
     
         20 . A method for reducing sulfur in exhaust gasses in an internal combustion engine, comprising:
 a. obtaining a composition comprising a lubricating oil basestock, an organic boron containing additive present in the amount of at least 0.1 and less than 8 weight percent of the composition, a dispersant-detergent-inhibitor system of less than 15 percent weight percent of the composition, zinc dithiophosphate additive present in the amount of at least 0.2 weight percent of the composition and less than 2.0, weight percent of the composition, a non corrosive ashless sulfur additive present in the amount of at least 0.1 and less than 4.0 weight percent of the composition wherein the composition has at least 100 PPM and less than 630 PPM phosphorus, at least 105 PPM and less than 710 PPM zinc, at least 1,000 PPM and less than 30,000 PPM sulfur, at least 80 PPM and less than 450 PPM Boron;   b. lubricating the internal combustion engine with the composition.