Transmission lubricating compositions with improved performance, containing acid/polyamine condensation product

Abstract

A lubricating composition containing (a) a hydrocarbyl phosphite; (b) the condensation product of at least one fatty acid with a polyamine; (c) a borate ester; (d) a borated dispersant; and (e) an oil of lubricating viscosity. The invention further relates to the use of the composition in automotive transmissions.

1 . A composition comprising: 
 (a) a hydrocarbyl phosphite, wherein the hydrocarbyl group contains at least 8 carbon atoms;    (b) a condensation product of a fatty acid with a polyamine;    (c) a borate ester;    (d) a borated dispersant; and    (e) an oil of lubricating viscosity.    
     
     
         2 . The composition of  claim 1 , wherein the hydrocarbyl phosphite is represented by the formula:  
       
         
           
           
               
               
           
         
       
       wherein at least one of R 1  and R 2  is a hydrocarbyl group and the other of R 1  and R 2  can be hydrogen or a hydrocarbyl group.  
     
     
         3 . The composition of  claim 1 , wherein the hydrocarbyl phosphite contains a hydrocarbyl group with at least 12 carbon atoms.  
     
     
         4 . The composition of  claim 1 , wherein the condensation product of a fatty acid with a polyamine comprises at least one compound selected from hydrocarbyl amides, hydrocarbyl imidazolines and mixtures thereof.  
     
     
         5 . The composition of  claim 4 , wherein the hydrocarbyl imidazoline is represented by the formula:  
       
         
           
           
               
               
           
         
       
       wherein R 7  is a hydrocarbyl group containing 10 or more carbon atoms; and R 8  is hydrogen, a hydrocarbyl group or a substituted hydrocarbyl group.  
     
     
         6 . The composition of  claim 4 , wherein the hydrocarbyl amide is represented by the formula:  
       
         
           
           
               
               
           
         
       
       wherein R 9  is a hydrocarbyl group containing 10 or more carbon atoms and R 10  is hydrogen, a hydrocarbyl group or a substituted hydrocarbyl group.  
     
     
         7 . The composition of  claim 1 , wherein the polyamine of (b) is selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, polyamine still bottoms and mixtures thereof.  
     
     
         8 . The composition of  claim 1 , wherein the borate ester is prepared by the reaction of a boron compound and at least one compound selected from epoxy compounds, alcohols and mixtures thereof.  
     
     
         9 . The composition of  claim 8 , wherein the boron compound is boric acid, metaboric acid, orthoboric acid, tetraboric acid, boric oxide, boron trioxide, alkyl borates, or mixtures thereof.  
     
     
         10 . The composition of  claim 8 , wherein the epoxy compounds are represented by the formula:  
       
         
           
           
               
               
           
         
       
       wherein R 28  is an alkyl group containing 8 to 30, carbon atoms; and R 29  is hydrogen or an alkyl group containing 1 to 4, carbon atoms.  
     
     
         11 . The composition of  claim 8 , wherein the borate ester is represented by the formula:  
       
         
           
           
               
               
           
         
       
       wherein R 11 , R 12  and R 13  are all hydrocarbyl groups containing 1 to about 30 carbon atoms, provided the total number of carbon atoms in R 11 , R 12  and R 13  is 9 or more.  
     
     
         12 . The composition of  claim 8  further comprising an optional borate ester represented by the formula:  
       
         
           
           
               
               
           
         
       
       wherein R 11 , R 12 , and R 13  are all hydrocarbyl groups containing 1 to about 8 carbon atoms, provided the total number of carbon atoms in R 11 , R 12 , and R 13  is 4 or more, further provided that the optional borate ester contains at least 2 fewer carbons atoms than the borate ester of component (c).  
     
     
         13 . The composition of  claim 12 , wherein the optional borate is ester is tributyl borate, tri-2-ethylhexyl borate or mixtures thereof.  
     
     
         14 . The composition of  claim 1 , wherein the borated dispersant is derived from an N-substituted long chain alkenyl succinimide.  
     
     
         15 . The composition of  claim 1 , wherein the oil of lubricating viscosity is selected from the group consisting of API Group II, III, IV oil and mixtures thereof.  
     
     
         16 . The composition of  claim 1  further comprising at least one other performance additive other than components (a)-(e), selected from the group consisting of metal deactivators, detergents, dispersants, antioxidants, antiwear agents, corrosion inhibitors, antiscuffing agents, extreme pressure agents, foam inhibitors, demulsifiers, friction-modifiers, viscosity modifiers, pour point depressants, seal swelling agents, fluidity modifiers and mixtures thereof.  
     
     
         17 . The composition of  claim 1 , wherein (a) the hydrocarbyl phosphite is present from about 0.01 weight percent to about 5 weight percent of the composition; (b) the condensation product of a fatty acid with a polyamine is present from about 0.01 weight percent to about 3 weight percent of the composition; (c) the borate ester is present from about 0.01 weight percent to about 3 weight percent of the composition; (d) the borated dispersant is present from about 0.03 weight percent to about 6 weight percent of the composition; and (e) the oil of lubricating viscosity is present from about 78 weight percent to about 99.9 weight percent of the composition.  
     
     
         18 . The composition of  claim 1 , wherein the oil of lubricating viscosity is present in an amount less than 50 weight percent, to form a concentrate.  
     
     
         19 . A process for the preparation of a composition comprising mixing: 
 (a) a hydrocarbyl phosphite;    (b) a condensation product of a fatty acid with a polyamine;    (c) a borate ester;    (d) a borated dispersant; and    (e) an oil of lubricating viscosity.    
     
     
         20 . A method for lubricating a power transmission system, comprising supplying thereto a lubricant comprising the composition of  claim 1 .  
     
     
         21 . The method of  claim 20 , wherein the power transmission system is selected from the group consisting of automatic transmissions, manual transmissions, trans-axles, gears and tractor transmissions.  
     
     
         22 . The method of  claim 21 , wherein the transmission system is an automatic transmission.