Lubricating oil composition with antiwear performance

Abstract

The present invention relates to a lubricating oil composition containing: (1) an antiwear package comprising: (a) a hydrocarbyl phosphate and amine salt thereof; and (b) an alkylene coupled adduct of a hydrocarbyl substituted dithiophosphoric acid and a α,β-unsaturated carbonyl containing compound; (2) an antioxidant package comprising: (a) a hydrocarbyl diphenylamine; and (b) a sterically hindered phenol; (3) a metal deactivator; and (4) an oil of lubricating viscosity. The invention further relates to the process to make the lubricating oil composition and its use in industrial fluids especially hydraulic fluids.

What is claimed is:  
     
         1 . A lubricating oil composition comprising: 
 (1) an antiwear package comprising: 
 (a) a hydrocarbyl phosphate and amine salt thereof; and  
 (b) an alkylene coupled adduct of a hydrocarbyl substituted dithiophosphoric acid and a α,β-unsaturated carbonyl containing compound;  
   (2) an antioxidant package comprising: 
 (a) a hydrocarbyl diphenylamine; and  
 (b) a sterically hindered phenol;  
   (3) a metal deactivator; and    (4) an oil of lubricating viscosity.    
     
     
         2 . The composition of  claim 1  wherein the hydrocarbyl phosphate and amine salts thereof is represented by the formula:  
       
         
           
           
               
               
           
         
       
       wherein J 1 , J 2 , J 3 , J 4  are independently oxygen or sulphur; R 1  and R 2  are independently hydrogen or a hydrocarbyl group; and R 3 , R 4  and R 5  are independently hydrogen or alkyl.  
     
     
         3 . The composition of  claim 1  wherein the alkylene coupled adduct of a hydrocarbyl substituted dithiophosphoric acid and a α,β-unsaturated carbonyl containing compound is represented by the formula:  
       
         
           
           
               
               
           
         
       
       wherein: 
 J 5 , J 6 , J 7 , J 8  are independently sulphur or oxygen, provided at least one of J 5 , J 6 , J 7 , J 8  is sulphur;  
 n is 1 or 2 provided that m+n=2, except when R12 is hydrogen;  
 m is 0 or 1 provided that m+n=2, except when R 12  is hydrogen;  
 R 6  R 7  R 8  and R 9  are independently hydrogen or a hydrocarbyl group;  
 R 10  and R 11  are independently hydrogen or an alkyl group;  
 R 12  is hydrogen, hydrocarbylene or an oxygen containing hydrocarbylene group optionally containing ether linkages;  
 R 13  is hydrogen or a hydrocarbyl group; and  
 T is —S—, —O—, or —NR 14 , wherein R 14  is hydrogen or a hydrocarbyl group.  
 
     
     
         4 . The composition of  claim 3 , wherein the α,β-unsaturated carbonyl containing compound is selected from the group consisting of methylene-bis-acrylamide, methylene-bis-methacrylamide, acrylamide, methacrylamide, acrylic acid, methacrylic acid, acrylate esters, methacrylate esters and mixtures thereof.  
     
     
         5 . The composition of  claim 1  wherein the hydrocarbyl diphenylamine is represented by the following formula:  
       
         
           
           
               
               
           
         
       
       wherein R 15  can be the same or different and is independently hydrogen or a hydrocarbyl group; and z is independently 0, 1, 2, or 3, provided that at least one aromatic ring contains a hydrocarbyl group.  
     
     
         6 . The composition of  claim 1  wherein a sterically hindered phenol that can be represented by the formula:  
       
         
           
           
               
               
           
         
       
       wherein: R 16  and R 17  are independently alkyl groups; Q is hydrogen or a hydrocarbyl group; and v is 1, 2 or 3.  
     
     
         7 . The composition of  claim 1  wherein the metal deactivator is a derivative of benzotriazole containing hydrocarbyl substitutions which include at least one of the following ring positions 1- or 2- or 4- or 5- or 6- or 7-.  
     
     
         8 . The composition of  claim 1  wherein the metal deactivator is a 2,5-bis(alkyl-dithio)-1,3,4-thiadiazole.  
     
     
         9 . The composition of  claim 1  wherein the oil of lubricating viscosity is an API Group I, II, III oil or mixtures thereof.  
     
     
         10 . The composition of  claim 1  further comprising at least one performance additive selected from the group consisting of rust inhibitors, foam inhibitors, demulsifiers, friction modifiers, viscosity modifiers, pour point depressants and mixtures thereof.  
     
     
         11 . The composition of  claim 1  wherein the hydrocarbyl phosphate and amine salts thereof is present in the range from about 0.01 to about 5 weight percent of the lubricating oil composition; 
 alkylene coupled adduct of a hydrocarbyl substituted dithiophosphoric acid and a α,β-unsaturated carbonyl containing compound is present in the range from about 0.01 to about 5 weight percent of the lubricating oil composition; wherein the hydrocarbyl diphenylamine is present in the range from about 0.01 to about 5 weight percent of the lubricating oil composition; wherein the sterically hindered phenol is present in the range from about 0.01 to about 5 weight percent of the lubricating oil composition; wherein the metal deactivator is present in the range from about 0.0001 to about 5 weight percent of the lubricating oil composition; and wherein the oil of lubricating viscosity is present in the range from about 34 to about 99.96 weight percent of the lubricating oil composition.  
 
     
     
         12 . The composition of  claim 11  further comprising performance additives wherein the rust inhibitors are present in the range from 0 to about 5 weight percent of the lubricating oil composition wherein foam inhibitors are present in the range from about 0 to about 5 weight percent of the lubricating oil composition; wherein the demulsifiers are present in the range from about 0 to about 5 weight percent of the lubricating oil composition; wherein the pour point depressants are present in the range from about 0 to about 5 weight percent of the lubricating oil composition; wherein the friction modifiers are present in the range from about 0 to about 6 weight percent of the lubricating oil composition; and wherein the viscosity modifiers are present in the range from about 0 to about 20 weight percent of the lubricating oil composition.  
     
     
         13 . A process for preparing a lubricating oil composition comprising the steps of: 
 (1) mixing at least one metal deactivator, in a hydrocarbyl phosphate and amine salt thereof; and    (2) adding and mixing substantially all of the product of step (1) to an alkylene coupled adduct of a hydrocarbyl substituted dithiophosphoric acid and a α,β-unsaturated carbonyl containing compound, and substantially all of the antioxidant package selected from the group comprising a hydrocarbyl diphenylamine, a sterically hindered phenol and mixtures thereof sequentially, separately or combinations thereof to form a mixture; and    (3) adding and mixing the resultant mixture of step (2) into the oil of lubricating viscosity or mixtures thereof.    
     
     
         14 . The process of  claim 13  further comprising adding to the mixture of step (2), step (3) or combinations thereof, performance additives selected from the group of a rust inhibitor, a foam inhibitor, a demulsifier, a viscosity modifier, a pour point depressant and mixtures thereof.  
     
     
         15 . A process to prepare a concentrate of a lubricating oil composition comprising the steps of: 
 (1) mixing at least one metal deactivator, in a hydrocarbyl phosphate and amine salt thereof; and    (2) adding and mixing substantially all of the product of step (1) to an alkylene coupled adduct of a hydrocarbyl substituted dithiophosphoric acid and a α,β-unsaturated carbonyl containing compound, and substantially all of the antioxidant package selected from the group comprising a hydrocarbyl diphenylamine, a sterically hindered phenol and mixtures thereof sequentially, separately or combinations thereof to form a mixture; and    (3) adding with mixing to the resultant mixture of step (2) a sufficient portion of the lubricating oil, base oil, diluent oil or mixtures thereof to form a concentrate of the lubricating oil composition.    
     
     
         16 . The process of  claim 15  further comprising adding to the mixture of step (2), step (3) or combinations thereof, performance additives selected from the group of a rust inhibitor, a foam inhibitor, a demulsifier, a viscosity modifier, a pour point depressant and mixtures thereof.  
     
     
         17 . The process of  claim 15 , further comprising adding the concentrate to the final portion of lubricating oil, base oil, diluent oil or mixtures thereof resulting in a finished fluid.  
     
     
         18 . A lubricating oil composition for use as industrial fluids, hydraulic fluids, turbine oils, circulating oils and combinations thereof, comprising the lubricating oil composition of  claim 1 .  
     
     
         19 . A lubricant composition for hydraulic fluids comprising the composition of  claim 1 .  
     
     
         20 . A lubricant composition for the hydraulic fluid according to  claim 19 , wherein the hydraulic fluid has at least one property selected from the group consisting of decreased formation of filter plugging deposits and sludge, good levels of antiwear, good levels of oxidation inhibition, good hydrolytic stability.