Lubricant additive and lubricating oil composition

Abstract

Provided are (i) a lubricant additive including a borazine compound represented by the following general formula (1), (ii) a lubricating oil composition including a lubricating base oil and the lubricant additive, and (iii) a lubricating oil composition further including a friction modifier represented by the following general formula (2).

1 . A lubricant additive comprising:
 a borazine compound represented by the following general formula (1):   
       
         
           
           
               
               
           
         
       
       (In the formula (1), R 1 , R 3 , and R 5  are each independently hydrogen, a C1 to C30 hydrocarbyl group, or a C1 to C30 hydrocarbyl group comprising a heteroatom other than sulfur and phosphorus; and R 2 , R 4 , and R 6  are each independently hydrogen, a C1 to C30 hydrocarbyl group, or a C1 to C30 hydrocarbyl group comprising oxygen or boron or nitrogen.). 
     
     
         2 . The lubricant additive according to  claim 1 , wherein in the formula (1) R 1 , R 3 , and R 5  are each independently hydrogen, a C1 to C30 hydrocarbyl group, or a C1 to C30 hydrocarbyl group comprising oxygen or boron or nitrogen. 
     
     
         3 . The lubricant additive according to  claim 1 , wherein in the formula (1) R 1 , R 3 , and R 5  are each independently hydrogen, a C1 to C30 hydrocarbyl group, or a C1 to C30 hydrocarbyl group comprising oxygen or boron. 
     
     
         4 . The lubricant additive according to  claim 1 ,
 wherein in the formula (1), R 1 , R 3 , and R 5  are the same groups; and   R 2 , R 4 , and R 6  are the same groups.   
     
     
         5 . A lubricating oil composition comprising:
 (A) a lubricating base oil; and   (B) the lubricant additive according to  claim 1 .   
     
     
         6 . The lubricating oil composition according to  claim 5 , further comprising:
 (C) a friction modifier represented by the following general formula (2):   
       
         
           
           
               
               
           
         
       
       (In the formula (2), p is 0 or 1; q is 0 or 1; r is 0 or 1; R 7  is a hydrocarbyl group having no less than 8 carbon atoms; and R 8 , R 9 , and R 10  are each independently hydrogen or a C1 to C4 hydrocarbyl group.). 
     
     
         7 . The lubricating oil composition according to  claim 6 ,
 wherein in the formula (2), at least R 9  and R 10  are hydrogen; and   where p and q are 1, R 8 , R 9 , and R 10  are hydrogen.   
     
     
         8 . The lubricating oil composition according to  claim 5 , further comprising:
 one or more selected from the group consisting of an ashless dispersant, an antioxidant, a friction modifier, a friction-reducing agent, a metallic detergent, a viscosity index improver, a pour point depressant, a corrosion inhibitor, an anti-rust agent, an anti-emulsifier, a metal deactivator, a defoamer, and a coloring agent.   
     
     
         9 . The lubricating oil composition according to  claim 5 , which is a lubricating oil composition for internal combustion engines. 
     
     
         10 . The lubricating oil composition according to  claim 6 , further comprising:
 one or more selected from the group consisting of an ashless dispersant, an antioxidant, a friction modifier, a friction-reducing agent, a metallic detergent, a viscosity index improver, a pour point depressant, a corrosion inhibitor, an anti-rust agent, an anti-emulsifier, a metal deactivator, a defoamer, and a coloring agent.   
     
     
         11 . The lubricating oil composition according to  claim 6 , which is a lubricating oil composition for internal combustion engines.