Lubricating composition

Abstract

The present invention provides a lubricating composition comprising:—a base Oil;—a detergent; and—an amine compound having the following general formula (I): R 1 NHR 2 (I) wherein R1 represents a hydrocarbyl group containing 1 to 50 carbon atoms and R2 is selected from the group consisting of H and a hydrocarbyl group containing 1 to 50 carbon atoms; wherein the amine compound is present at a level of greater than 0.3 wt % by weight of the lubricating composition.

1 . A lubricating composition comprising:
 a base oil;   a detergent; and   an amine compound having the following general formula (I):
   R 1 NHR 2    (I)
 
   
       wherein R 1  represents a hydrocarbyl group containing 1 to 50 carbon atoms and R 2  is selected from the group consisting of H and a hydrocarbyl group containing 1 to 50 carbon atoms; 
       wherein the amine compound is present at a level of greater than 0.3 wt % and less than 2.5 wt %, by weight of the lubricating composition. 
     
     
         2 . The lubricating composition according to  claim 1  wherein the amine compound is present at a level in the range of from 0.4 wt % to 2.4 wt %, by weight of the lubricating composition. 
     
     
         3 . The lubricating composition according to  claim 1  wherein the amine compound is present at a level in the range of from 0.5 wt % to 2.0 wt %, by weight of the lubricating composition. 
     
     
         4 . The lubricating composition according to  claim 1  wherein R 2  represents H. 
     
     
         5 . The lubricating composition according to  claim 1  wherein R 1  represents a hydrocarbyl group containing 8 to 30 carbon atoms. 
     
     
         6 . The lubricating composition according to  claim 1  wherein the composition comprises from 0.01 wt. % to 2.0 wt. % of the amine compound having general formula (I), based on the total weight of the composition. 
     
     
         7 . The lubricating composition according to  claim 1  wherein the composition comprises at least 4 wt. % of the detergent. 
     
     
         8 . The lubricating composition according to  claim 1  wherein the detergent is selected from the group consisting of a sulphonate-type detergent, a phenate-type detergent, and mixtures. 
     
     
         9 . The lubricating composition according to  claim 1  wherein the composition has a Total Base Number (TBN) value of at most 75 mg KOH/g. 
     
     
         10 . The lubricating composition according to  claim 1  wherein the composition has a kinematic viscosity at 100° C. of above 5.6 mm 2 /s and below 21.9 mm 2 /s. 
     
     
         11 . The lubricating composition according to  claim 1  wherein the composition contains no other additives than one or more detergents, one or more dispersants and one or more amine compound(s) having general formula (I). 
     
     
         12 . The lubricating composition according to  claim 1  wherein the composition is a marine diesel engine oil. 
     
     
         13 . A lubricating composition comprising:
 a base oil;   a detergent; and   an amine compound having the following general formula (I):
   R 1 NHR 2    (I)
 
   
       wherein R 1  represents a hydrocarbyl group containing 1 to 50 carbon atoms and R 2  is selected from the group consisting of H and a hydrocarbyl group containing 1 to 50 carbon atoms; 
       wherein the amine compound is present at a level of greater than 0.3 wt %, by weight of the lubricating composition; 
       and wherein the composition has a Total Base Number (TBN) value of at most 65 mg KOH/g, even more preferably at most 60 mg KOH/g (in particular according to ASTM D 2896) 
     
     
         14 . Use of a lubricating composition according to  claim 13  in order to improve one or more of corrosive wear protection properties according to ASTM G181, BN retention and BN usage properties as measured according to ASTM D 2896.