Lubricating oil additive composition for internal combustion engine

Abstract

The invention provides a lubricating oil additive for internal combustion engines which additive enables to prepare a lubricating oil composition for internal combustion engines having an enhanced base number without impairing the performance of an exhaust gas treatment apparatus such as a PM trap or an oxidation catalyst member; a lubricating oil additive composition for internal combustion engines; and a lubricating oil composition for internal combustion engines containing the lubricating oil additive composition. The invention is directed to a lubricating oil additive composition for internal combustion engines including a succinimide compound represented by formula (1): (wherein R 1 represents a C6-C30 alkenyl group or alkyl group; each of R 7 , R 8 , R 9 , and R 10 represents hydrogen or a C1-C3 alkyl group; q is an integer from 2 to 4; n is an integer from 0 to 3; r is an integer from 2 to 4; and A represents an amino group or an N-piperazyl group), or a boron-introduced product thereof; and to use thereof.

1 . A lubricating oil additive composition for internal combustion engines comprising a succinimide compound represented by formula (1):  
       
         
           
           
               
               
           
         
       
       (wherein R 1  represents a C6-C30 alkenyl group or alkyl group; each of R 7 , R 8 , R 9 , and R 10  represents hydrogen or a C1-C3 alkyl group; q is an integer from 2 to 4; n is an integer from 0 to 3; r is an integer from 2 to 4; and A represents an amino group or an N-piperazyl group), or a boron-introduced product thereof.  
     
     
         2 . A lubricating oil additive composition for internal combustion engines as described in  claim 1 , which comprises a succinimide compound represented by formula (1) wherein each of R 7 , R 8 , R 9 , and R 10  represents hydrogen, or a boron-introduced product thereof.  
     
     
         3 . A lubricating oil additive composition for internal combustion engines as described in  claim 2 , which comprises a succinimide compound represented by formula (1) wherein each of q and r is 2, or a boron-introduced product thereof.  
     
     
         4 . A lubricating oil additive composition for internal combustion engines as described in  claim 3 , which comprises a succinimide compound represented by formula (1) wherein R 1  has 10 to 20 carbon atoms, or a boron-introduced product thereof.  
     
     
         5 . A lubricating oil additive composition for internal combustion engines comprising a succinimide compound as recited in any of  claims 1  to  4 , or a boron-introduced product thereof (A) and a substituted hydroxyaromatic ester derivative (B).  
     
     
         6 . A lubricating oil additive composition for internal combustion engines as described in  claim 5 , wherein the substituted hydroxyaromatic ester derivative is represented by formula (2):  
       
         
           
           
               
               
           
         
       
       (wherein each of R 2  and R 3 , which may be identical to or different from each other, represents a organic group having six or more carbon atoms; a, b, c, d, and e are integers satisfying the relations 1≦a≦3; 1≦b≦3; 0≦c≦3; 1≦d≦3; 1≦e≦3; 3≦(a+b+e)≦6; and 1≦(c+d)≦5; and when a plurality of R 2 S or R 3 s are present, these groups may be identical to or different from one another) or is represented by formula (3):  
       
         
           
           
               
               
           
         
       
       wherein each of R 4 , R 5 , and R 6 , which may be identical to or different from one another, represents a organic group having six or more carbon atoms; f, g, h, i, j, k, and m are integers satisfying the relations 0≦f≦3; 0≦g≦3; 1≦(f+g)≦3; 0≦h≦4; 0≦i≦3; 1≦(h+i)≦6; 0≦(f+h)≦4; 0≦(g+i+m)≦4; 0≦j≦3; 1≦k≦3; 1≦m≦3; 3≦(f+g+h+i+m)≦8; and 1≦(j+K)≦5; when a plurality of R 4 , R 5 s, or R 6 s are present, these groups may be identical to or different from one another).  
     
     
         7 . A lubricating oil composition for internal combustion engines comprising a lubricating oil additive composition for internal combustion engines as recited in any of  claims 1  to  6 .