Lubricant compositions

Abstract

Lubricant compositions comprises a lubricant base oil and one or more compounds resulting the modification of a succinimide represented by formula (1) or (2) wherein R 1 and R 2 may be the same or different and are each independently a hydrocarbon group having 8 to 30 carbon atoms, R 3 and R 4 may be the same or different and are each independently a hydrocarbon group having 1 to 4 carbon atoms, R 5 is hydrogen or a hydrocarbon group having 1 to 30 carbon atoms, n is an integer from 1 to 7. The lubricant compositions have a long-lasting anti-shudder property, an enhanced transmission capacity for a wet clutch, and an excellent shifting property.

What is claimed is:  
     
         1 . A lubricant composition which comprises a lubricant base oil and one or more compounds resulting from the modification of a succinimide represented by formula (1) or (2)  
       
         
           
           
               
               
           
         
       
       wherein R 1  and R 2  are the same or different and are each independently a hydrocarbon group having 8 to 30 carbon atoms, R 3  and R 4  are the same or different and are each independently a hydrocarbon group having 1 to 4 carbon atoms, R 5  is hydrogen or a hydrocarbon group having 1 to 30 carbon atoms, n is an integer from 1 to 7.  
     
     
         2 . The lubricant composition according to  claim 1  wherein said R 1  and R 2  are each independently a branched hydrocarbon having 8 to 30 carbon atoms.  
     
     
         3 . The lubricant composition according to  claim 1  wherein said n is an integer from 1 to 3.  
     
     
         4 . The lubricant composition according to  claim 1  wherein said modified succinimide compound results is a compound modified with one or more compounds selected from the group consisting of boric acids, phosphoric acids, carboxylic acids, and derivatives thereof.  
     
     
         5 . The lubricant composition according to  claim 1  which further comprises one or more additives selected from the group consisting of friction modifiers and metal-based detergents.  
     
     
         6 . The lubricant composition according to  claim 1  wherein said composition is used for automatic transmissions and/or continuously variable transmissions.  
     
     
         7 . The lubricant composition according to  claim 1  wherein said composition is used for transmissions having wet clutches and/or wet brakes.