Method for preparing a lubricating composition

Abstract

The present invention provides a method for preparing a lubricating composition, in particular a grease, the method at least comprising the steps of: a) providing a base oil composition optionally containing one or more additives; b) providing a solution of one or more alkyl-substituted quinolines or oligomeric derivatives thereof in a solvent; and c) adding the solution of step b) to the base oil composition of step a) at a temperature below 150° C.

1 . A method for preparing a lubricating composition, in particular a grease, the method at least comprising the steps of:
 a) providing a base oil composition;   b) providing a solution of an alkyl-substituted quinoline or oligomeric derivative thereof in a solvent; and   c) adding the solution of step b) to the base oil composition of step a) at a temperature below 150° C.   
     
     
         2 . (canceled) 
     
     
         3 . The method according to  claim 2 , wherein the alkyl-substituted quinoline is an alkyl-substituted 1,2-dihydroquinoline. 
     
     
         4 . The method according to  claim 3 , wherein the alkyl-substituted 1,2-dihydroquinoline has the general formula (I) 
       
         
           
           
               
               
           
         
       
       wherein R 1 -R 8  are independently selected from hydrogen or an alkyl group having 1-8 carbon atoms; and n is 0, 1, 2 or 3. 
     
     
         5 . The method according to  claim 4 , wherein R 1 -R 8  are independently selected from hydrogen or an alkyl group having 1-4 carbon atoms. 
     
     
         6 . The method according to  claim 5 , wherein R 4 -R 8  are hydrogen. 
     
     
         7 . The method according to  claim 6 , wherein the alkyl-substituted 1,2-dihydroquinoline has an average value for n of from 1.0 to 2.0. 
     
     
         8 . The method according to  claim 7 , wherein the alkyl substituted quinoline provided in the solution has a solubility of below 0.1% as determined using ASTM D893. 
     
     
         9 . The method according to  claim 8 , wherein the solvent comprises a polyglycol. 
     
     
         10 . A lubricating composition, in particular a grease, obtained by the method according to any one of  claims 1  to  9 . 
     
     
         11 . A method according to any one of  claims 1 ,  3 ,  4 ,  5 ,  6 ,  7 ,  8 , and  9 , wherein in step c) the solution of step b) is added at a temperature below 120°.