Lubricating Compositions Containing Sulphonates

Abstract

A lubricating composition containing (a) a detergent package containing (i) an oligomeric reaction product of (1) a hydrocarbyl-substituted phenol; (2) an aldehyde; and (3) a carboxyl-substituted phenol or a carboxyl-substituted phenylamine; and salts of the reaction product; (ii) a sulphonate; and (iii) optionally a phenate; (b) a dispersant; and (c) an oil of lubricating viscosity, wherein the sulphonate detergent is overbased with a metal ratio of about 12.5:1 to about 40:1. The composition is suitable for internal combustion engines, particularly marine diesel applications to provide improved cleanliness properties, antiwear performance or deposit control.

1 . A lubricating composition comprising:
 (a) a detergent package comprising:
 (i) an oligomeric reaction product of (1) a hydrocarbyl-substituted phenol; (2) an aldehyde; and (3) a carboxyl-substituted phenol or a carboxyl-substituted phenylamine; or a salt of the reaction product; 
 (ii) a sulphonate; and 
 (iii) optionally a phenate; 
   (b) optionally a dispersant; and   (c) an oil of lubricating viscosity,   
       wherein the sulphonate detergent is overbased with a metal ratio of about 12.5:1 to about 40:1. 
     
     
         2 . The lubricating composition of  claim 1 , wherein the lubricating composition has a total base number of 30 or higher. 
     
     
         3 . The lubricating composition of  claim 1 , wherein the lubricating composition has a total base number of 50 or higher. 
     
     
         4 . The lubricating composition of  claim 1 , wherein the sulphonate detergent metal ratio is 15:1 to 40:1. 
     
     
         5 . The lubricating composition of  claim 1 , wherein the sulphonate detergent has a total base number of at least 350. 
     
     
         6 . The lubricating composition of  claim 1 , wherein the oligomeric reaction product is a substantially linear compound comprising at least one unit of the formulae (I) or (II): 
       
         
           
           
               
               
           
         
       
       each end of the compound having a terminal group of formulae (III) or (IV): 
       
         
           
           
               
               
           
         
       
       such groups being linked by divalent bridging groups, which may be the same or different for each linkage; wherein in formulas (I)-(IV) f is 1, 2 or 3; U is —OH, —NH 2 —NHR 1 , —N(R 1 ) 2  or mixtures thereof, R 1  is a hydrocarbyl group containing 1 to 5 carbon atoms; R 2  is hydroxyl or a hydrocarbyl group and j is 0, 1, or 2; R 3  is hydrogen or a hydrocarbyl group; R 4  is a hydrocarbyl group or a substituted hydrocarbyl group; g is 1, 2 or 3, provided at least one R 4  group contains 8 or more carbon atoms; and wherein the molecules on average contain at least one of unit (I) or (III) and at least one of unit (II) or (IV) and the ratio of the total number of units (I) and (III) to the total number of units of (II) and (IV) in the composition is about 0.1:1 to about 2:1. 
     
     
         7 . The lubricating composition of  claim 6 , wherein the oligomeric reaction product is a metal salt. 
     
     
         8 . A lubricating composition comprising:
 (a) a detergent package comprising:
 (i) 0.1 to 8 weight percent of an oligomeric reaction product of (1) an hydrocarbyl-substituted phenol; (2) an aldehyde; and (3) a carboxyl-substituted phenol or a carboxyl-substituted phenylamine; and salts of the reaction product; 
 (ii) 5 to 25 weight percent of a sulphonate; and 
 (iii) 0 to 10 weight percent of a phenate; 
   (b) 0.1 to 5 weight percent of a dispersant; and   (c) 46 to 94.8 weight percent of an oil of lubricating viscosity,   
       wherein the sulphonate detergent is overbased with a metal ratio of about 12.5:1 to about 40:1. 
     
     
         9 . A process to prepare a lubricating composition comprising mixing:
 (a) a detergent package comprising:
 (i) an oligomeric reaction product of (1) an hydrocarbyl-substituted phenol; (2) an aldehyde; and (3) a carboxyl-substituted phenol or a carboxyl-substituted phenylamine; and salts of the reaction product; 
 (ii) a sulphonate; and 
 (iii) optionally a phenate; 
   (b) a dispersant; and   (c) an oil of lubricating viscosity,   
       wherein the sulphonate detergent is overbased with a metal ratio of about 12.5:1 to about 40:1. 
     
     
         10 . A method for lubricating an internal combustion engine, comprising supplying thereto a lubricant comprising the lubricating composition of  claim 1 . 
     
     
         11 . The method of lubricating an internal combustion engine of  claim 10 , wherein the internal combustion engine is a marine diesel engine.