Lubricants with molybdenum containing compositions and methods of using the same

Abstract

This invention relates to a lubricating composition comprising a major amount of an oil of lubricating viscosity and (A) an antiwear improving amount of at least one molybdenum containing composition, and (B) at least one member selected from the group consisting of (i) at least one borated overbased metal salt of an acidic organic compound, provided that (A) and (Bi) are not the same, (ii) a combination of (a) at least one organic polysulfide or at least one ashless dithiocarbamate containing composition and (b) at least one component selected from the group consisting of a metal thiophosphate, a phosphoric acid ester or salt thereof, a phosphorus-containing carboxylic acid, ester, ether, or amide, a borated dispersant, an alkali metal borate, a borated fatty amine, a borated phospholipid, a borate ester, and mixtures thereof, and (iii) a combination of (i) and (ii).

1 . A lubricating composition comprising a major amount of an oil of lubricating viscosity and 
 (A) an antiwear improving amount of at least one molybdenum containing composition, and    (B) at least one member selected from the group consisting of    (i) at least one borated overbased metal salt of an acidic organic compound, provided that (A) and (Bi) are not the same,    (ii) a combination of (a) at least one organic polysulfide or at least one ashless dithiocarbamate containing composition and (b) at least one component selected from the group consisting of a metal thiophosphate, a phosphoric acid ester or salt thereof, a phosphorus-containing carboxylic acid, ester, ether, or amide, a borated dispersant, an alkali metal borate, a borated fatty amine, a borated phospholipid, a borate ester, and mixtures thereof, and    (iii) a combination of (i) and (ii).    
     
     
         2 . The composition of  claim 1 , wherein (A) is present in an amount to provide from about 125 to about 900 ppm molybdenum to the lubricating composition.  
     
     
         3 . The composition of  claim 1 , wherein (A) is a molybdenum containing alkali or alkaline earth metal overbased sulfonate, carboxylate, or phenate.  
     
     
         4 . The composition of  claim 1 , wherein (A) is molybdenum containing alkali or alkaline earth metal sulfonate.  
     
     
         5 . The composition of  claim 4 , wherein the alkaline or alkaline earth metal is calcium or magnesium.  
     
     
         6 . The composition of  claim 1  wherein (A) is prepared by carbonation of a mixture comprising at least one alkali or alkaline earth metal compound, an acidic organic compound, and at least one hydrocarbon insoluble organic molybdenum complex.  
     
     
         7 . The composition of  claim 6  wherein the organic molybdenum complex is an amine molybdenum complex.  
     
     
         8 . The composition of  claim 1  wherein (A) is at least one molybdenum thiophosphate or at least one molybdenum thiocarbamate.  
     
     
         9 . The composition of  claim 1  wherein (A) is at least one molybdenum oxysulfide dithiophosphate or at least one molybdenum oxysulfide dithiocarbamate.  
     
     
         10 . The composition of  claim 1 , wherein (B) is (i) and the borated overbased salt of an acidic organic compound is a borated overbased alkali or alkaline earth metal sulfonate, carboxylate or phenate.  
     
     
         11 . The composition of  claim 1  wherein (B) is (i) and the borated overbased salt of an acidic organic compound is a borated overbased sodium, calcium or magnesium sulfonate or carboxylate.  
     
     
         12 . The composition of  claim 1 , wherein (B) is (i) and the lubricating composition further comprises (C) at least one sulfurized organic compound or at least one ashless dithiocarbamate containing compound, or (D) at least one phosphorus or boron extreme pressure.  
     
     
         13 . The composition of  claim 1  wherein (B) is (ii) and the organic polysulfide is a sulfurized oil, fatty acid or ester, olefin, polyolefin or mixtures thereof.  
     
     
         14 . The composition of  claim 1  wherein (B) is (ii) and the ashless dithiocarbamate containing composition (a) is prepared by reacting a dithiocarbamic acid or salt with an unsaturated compound.  
     
     
         15 . The composition of  claim 14  wherein the unsaturated compound is an acrylic ester of the formula R 1 R 2 C═C(R 3 )COOR 4 , wherein R 1 , R 2 , and R 3  are each independently hydrogen or a hydrocarbyl group, and R 4  is a hydrocarbyl group containing from 1 to about 24 carbon atoms.  
     
     
         16 . The composition of  claim 14  wherein the unsaturated compound is a methyl, ethyl, butyl, pentyl, or hexyl-acrylate or methacrylate.  
     
     
         17 . The composition of  claim 1  wherein the phosphoric acid ester or salt thereof (b) is a phosphoric acid ester prepared by reacting a dithiophosphoric acid with an epoxide to form an intermediate, and the intermediate is further reacted with a phosphorus acid or anhydride, or a salt of the phosphoric acid ester.  
     
     
         18 . The composition of  claim 17  wherein the dithiophosphoric acid is a dihydrocarbyl dithiophosphoric acid independently having from 1 to about 24 carbon atoms in each hydrocarbyl group.  
     
     
         19 . The composition of  claim 18  wherein the phosphoric acid ester or salt thereof is prepared by reacting the phosphoric acid ester with ammonia or an amine.  
     
     
         20 . The composition of  claim 19  wherein the amine is a tertiary aliphatic primary amine.  
     
     
         21 . The composition of  claim 1  wherein the phosphoric acid ester or salt thereof (b) is a phosphoric acid ester prepared by reacting a phosphorus acid or anhydride with at least one alcohol wherein each alcohol independently contains from about 1 to about 30 carbon atoms, or a salt of the phosphoric acid ester.  
     
     
         22 . The composition of  claim 1  wherein the phosphoric acid ester or salt thereof is a triarylphosphate.  
     
     
         23 . The composition of  claim 22  wherein the triarylphosphate is tricresylphosphate.  
     
     
         24 . The composition of  claim 12 , wherein (C) is a sulfurized olefin.  
     
     
         25 . A lubricating composition comprising a major amount of an oil of lubricating viscosity and 
 (A) an antiwear improving amount of at least one molybdenum containing composition, and    (B) at least one borated overbased metal salt of an acidic organic compound, provided that (A) and (B) are not the same.    
     
     
         26 . The composition of  claim 25 , wherein (A) is present in an amount to provide from about 125 to about 900 ppm molybdenum to the lubricating composition.  
     
     
         27 . The composition of  claim 25 , wherein (A) is a molybdenum containing alkali or alkaline earth metal overbased sulfonate, carboxylate, or phenate.  
     
     
         28 . The composition of  claim 25 , wherein (A) is a molybdenum containing alkali or alkaline earth metal overbased sulfonate.  
     
     
         29 . The composition of  claim 25  wherein (A) is prepared by carbonation of a mixture comprising at least one alkali or alkaline earth metal compound, an acidic organic compound, and at least one hydrocarbon insoluble organic molybdenum complex.  
     
     
         30 . The composition of  claim 29  wherein the organic molybdenum complex is an amine molybdenum complex.  
     
     
         31 . The composition of  claim 25  wherein (A) is a molybdenum thiophosphate or a molybdenum thiocarbamate.  
     
     
         32 . The composition of  claim 25  wherein (A) is a molybdenum oxysulfide dithiophosphate or a molybdenum oxysulfide dithiocarbamate.  
     
     
         33 . The composition of  claim 25 , wherein (B) the borated overbased salt of an acidic organic compound is a borated overbased alkali or alkaline earth metal sulfonate, carboxylate or phenate.  
     
     
         34 . The composition of  claim 25  A herein (B) is a borated overbased sodium, calcium, or magnesium sulfonate or carboxylate.  
     
     
         35 . The composition of  claim 25 , further comprises (C) at least one organic polysulfide or at least one dithiocarbamate containing compound, or (D) at least one phosphorus or boron antiwear or extreme pressure, wherein (B) and (D) are not the same.  
     
     
         36 . The composition of  claim 35 , wherein (C) is a sulfurized olefin.  
     
     
         37 . The composition of  claim 35 , wherein (C) is a dithiocarbamate ester prepared by reacting a dithiocarbamic acid or salt with an unsaturated compound.  
     
     
         38 . A lubricating composition comprising a major amount of an oil of lubricating viscosity, 
 (A) at least one molybdenum containing composition, and    (B) at least one combination of (a) at least one organic polysulfide or at least one ashless dithiocarbamate containing composition and (b) a component selected from the group consisting of a metal thiophosphate, a phosphoric acid ester or salt thereof, a phosphorus-containing carboxylic acid, ester, ether, or amide, a borated dispersant, an alkali metal borate, a borated fatty amine, a borated phospholipid, a borate ester, and mixtures thereof.    
     
     
         39 . The composition of  claim 38 , wherein (A) is a molybdenum containing alkali or alkaline earth metal sulfonate.  
     
     
         40 . The composition of  claim 38  wherein (A) is a molybdenum thiophosphate or a molybdenum thiocarbamate.  
     
     
         41 . The composition of  claim 38  wherein (A) is a molybdenum oxysulfide dithiophosphate or a molybdenum oxysulfide dithiocarbamate.  
     
     
         42 . A method of lubricating a transmission or a differential comprising the steps of introducing to a transmission or differential a lubricating composition comprising a major amount of an oil of lubricating viscosity and 
 (A) an antiwear improving amount of at least molybdenum containing composition, and    (B) at least one member selected from the group consisting of    (i) at least one borated overbased metal salt of an acidic organic compound, provided that (A) and (Bii) are not the same,    (ii) a combination of (a) at least one organic polysulfide or at least one ashless dithiocarbamate containing composition and (b) at least one component selected from the group consisting of a metal thiophosphate, a phosphoric acid ester or salt thereof, a phosphorus-containing carboxylic acid, ester, ether, or amide, a borated dispersant, an alkali metal borate, a borated fatty amine, a borated phospholipid, a borate ester, and mixtures thereof, and    (iii) a combination of (i) and (ii), and operating the differential or transmission.