Lubricant additive and lubricant oil composition

Abstract

A lubricant additive containing (A) a nitrogen-containing compound represented by the general formula (1) and (B) a borate ester compound represented by the general formula (2) and/or a borate ester compound represented by the general formula (3); and a lubricant oil composition containing the lubricant additive and a lubricant base oil, the lubricant additive and the lubricant oil composition containing an oiliness agent-type friction modifier that can exhibit a better friction reduction effect than that of conventional oiliness agent-type friction modifiers under a wider range of friction conditions.

1 . A lubricant additive comprising:
 (A) a nitrogen-containing compound represented by the general formula (1); and   (B) a borate ester compound represented by the general formula (2) and/or a borate ester compound represented by the general formula (3):   
       
         
           
           
               
               
           
         
         wherein, 
         for general formula (1), R 1  represents a hydrocarbyl group having a carbon number of 1 to 30 or a functionalized hydrocarbyl group having a carbon number of 1 to 30; 
         each of R 2 , R 3 , and R 4  independently represents a hydrocarbyl group having a carbon number of 1 to 30, a functionalized hydrocarbyl group having a carbon number of 1 to 30, or a hydrogen atom; 
         m represents an integer of 0 or 1; and 
         n represents an integer of 0 or 1 where m is 1; 
       
       
         
           
           
               
               
           
         
         for general formula (2), R 5  represents a hydrocarbyl group having a carbon number of 1 to 30 or a functionalized hydrocarbyl group having a carbon number of 1 to 30; and 
         each of R 6  and R 7  independently represents a hydrocarbyl group having a carbon number of 1 to 30, a functionalized hydrocarbyl group having a carbon number of 1 to 30, or a hydrogen atom; 
       
       
         
           
           
               
               
           
         
         for general formula (3), R 8  represents a hydrocarbyl group having a carbon number of 1 to 30 or a functionalized hydrocarbyl group having a carbon number of 1 to 30; and 
         each of R 9  and R 19  independently represents a hydrocarbyl group having a carbon number of 1 to 30, a functionalized hydrocarbyl group having a carbon number of 1 to 30, or a hydrogen atom. 
       
     
     
         2 . The lubricant additive according to  claim 1 ,
 wherein a molar ratio of the molar content of the component (B) in terms of boron to the molar content of the component (A) is 0.05 to 4.0.   
     
     
         3 . The lubricant additive according to  claim 1 , further comprising:
 one or more selected from the group consisting of: a lubricant base oil, an ashless dispersant, an antioxidant, a friction modifier, an anti-wear agent, a metallic detergent, a viscosity index improver, a corrosion inhibitor, an anti-rust agent, an anti-emulsifier, a metal deactivator, a defoaming agent, and a coloring agent.   
     
     
         4 . A lubricant oil composition comprising:
 a lubricant base oil; and   the lubricant additive according to  claim 1 .