Lubricants having an overbased metal salts and organic phosphites

Abstract

This invention relates to a lubricant comprising (A) a basic metal salt of an acidic organic compound and (B) a hydrocarbyl phosphite, provided that the lubricant is free of metal deactivators. In one aspect the lubricant is a manual transmission fluid. The lubricants provide good friction, good antiwear and thermal stability properties.

1 . A lubricating composition comprising a major amount of an oil of lubricating viscosity and (A) a basic metal salt of an acidic organic compound and (B) a hydrocarbyl phosphite, provided that the lubricant is free of metal deactivators.  
     
     
         2 . The composition of  claim 1  wherein the metal of (A) is an alkali or alkaline earth metal.  
     
     
         3 . The composition of  claim 1  wherein the metal of (A) is sodium, calcium or magnesium.  
     
     
         4 . The composition of  claim 1  wherein the acidic organic compound is an organic sulfonic acid or organic carboxylic acylating agent.  
     
     
         5 . The composition of  claim 1  wherein (A) is a alkaline earth metal overbased sulfonate.  
     
     
         6 . The composition of  claim 1  wherein (B) is a di or tri hydrocarbyl phosphite independently having from 1 about 24 carbon atoms.  
     
     
         7 . The composition of  claim 1  wherein (B) is represented by the following formula  
       
         
           
           
               
               
           
         
       
       wherein each R 5  is independently hydrogen or a hydrocarbyl group, provided at least one R 5  is hydrocarbyl:  
     
     
         8 . The composition of  claim 1  wherein (B) is a lower alkyl phosphite.  
     
     
         9 . The composition of  claim 1  further comprising at least one friction modifier or at least one acylated amine.  
     
     
         10 . A lubricating composition comprising a major amount of an oil of lubricating viscosity and (A) from about 0.02% to about 5% by weight of a basic metal salt of an acidic organic compound and (B) a hydrocarbyl phosphite independently having form about 2 to about 18 carbon atoms in each hydrocarbyl group, wherein (B) is present in an amount to deliver from about 0.01% to about 0.3% by weight phosphirus to the composition, provided that the lubricant is free of metal deactivators.  
     
     
         11 . The composition of  claim 10  wherein the metal of (A) is an alkali or alkaline earth metal.  
     
     
         12 . The composition of  claim 10  wherein the metal of (A) is sodium, calcium or magnesium.  
     
     
         13 . The composition of  claim 10  wherein the acidic organic compound is an organic sulfonic acid or organic carbolic acylating agent.  
     
     
         14 . The composition of  claim 10  wherein (B) contains one or more hydrocarbyl groups which are butyl, pentyl or groups.  
     
     
         15 . The composition of  claim 10  further comprising at least one friction modifier or at least one acylated amine.  
     
     
         16 . The composition of  claim 15  wherein the friction modifier is a fatty phosphite, a fatty acid amide, a fatty amine, a borated fatty amine, a borated fatty epoxide, a glycerol ester or a borated glycerol ester.  
     
     
         17 . A lubricating composition prepared by blending a major amount of an oil of lubricating viscosity and (A) a basic metal salt of an acidic organic compound and (B) a hydrocarbyl phosphite, provided that the lubricant is free of metal deactivators.  
     
     
         18 . The composition of  claim 1  wherein the lubricating composition is a manual transmission.  
     
     
         19 . The composition of  claim 10  wherein the lubricating composition is a manual transmission.  
     
     
         20 . The composition of  claim 17  wherein the lubricating composition is a manual transmission.