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.

What is claimed:  
     
         1 . A lubricating composition comprising a major amount of an oil of lubricating viscosity and (A) a basic salt of [an acidic organic compound] an organic sulfonic acid or organic acylating agent; (B) a hydrocarbyl phosphite represented by the formula 
       (R 5 )) 3 P 
       and (C) a friction modifier is a glycerol ester or a borated glycerol ester, wherein each R 5  is independently hydrogen or a hydrocarbyl group and at least one R 5  is hydrocarbyl, provided that the lubricant is free of metal deactivators, wherein the basic metal salt (A) is an overbased material and the ratio of equivalents of overbased material based on the total base number to equivalents of hydrocarbyl phosphite based on phosphorus atoms is at least one.  
     
     
         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 .- 5 . (canceled)  
     
     
         6 . The composition of  claim 1  wherein (B) is a di or tri hydrocarbyl phosphite independently having from 1 to about 24 carbon atoms.  
     
     
         7 . (canceled)  
     
     
         8 . The composition of  claim 1  wherein (B) is an alkyl phosphite having at least one alkyl group selected from methyl, ethyl, propyl, butyl, pentyl and hexyl.  
     
     
         9 . (canceled)  
     
     
         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 a basic salt of [an acidic organic compound] an organic sulfonic acid or organic acylating agent; (B) a hydrocarbyl phosphite represented by the formula 
       (R 5 )) 3 P 
       and (C) from about 0.05% to about 1% by weight a friction modifier is a glycerol ester or a borated glycerol ester,  
       wherein each R 5  is independently a hydrocarbyl group of about 2 to about 8 carbon atoms, wherein (B) is present in an amount to deliver from about 0.01% to about 0.03% by weight phosphorus to the composition, wherein the basic metal salt (A) is an overbased material and the ratio of equivalents of overbased material based on the total base number to equivalents of hydrocarbyl phosphite based on phosphorus atoms is at least one, 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, wherein (B) contains one or more hydrocarbyl groups which are butyl, pentyl or hexyl groups and wherein (C) is a glycerol mono-oleate.  
     
     
         12 . (canceled)  
     
     
         13 . (canceled)  
     
     
         14 . (canceled)  
     
     
         15 . (canceled)  
     
     
         16 . (canceled)  
     
     
         17 . A lubricating composition prepared by blending a major amount of an oil of lubricating viscosity and (A) a basic salt of [an acidic organic compound] an organic sulfonic acid or organic acylating agent; (B) a hydrocarbyl phosphite represented by the formula 
       (R 5 )) 3 P 
       and (C) a friction modifier is a glycerol ester or a borated glycerol ester,  
       wherein each R 5  is independently hydrogen or a hydrocarbyl group and at least one R 5  is hydrocarbyl, provided that the lubricant is free of metal deactivators, wherein the basic metal salt (A) is an overbased material and the ratio of equivalents of overbased material based on the total base number to equivalents of hydrocarbyl phosphite based on phosphorus atoms is at least one.  
     
     
         18 . The composition of  claim 1  wherein the lubricating composition is a manual transmission fluid.  
     
     
         19 . The composition of  claim 10  wherein the lubricating composition is a manual transmission fluid.  
     
     
         20 . The composition of  claim 17  wherein the lubricating composition is a manual transmission fluid.