Lubricant composition

Abstract

Disclosed is a lubricant composition containing a compound of formula (1) and a carboxylic acid, and exhibiting excellent lubrication potency. wherein D represents a cyclic group; X represents a single bond, a group NR 1 (where R 1 represents a hydrogen atom, or an alkyl group having from 1 to 30 carbon atoms), an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group, or a divalent linking group of a combination thereof; R represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group; m indicates an integer of from 2 to 11.

1 . A lubricant composition containing a compound of the following formula (1) and a compound of the following formula (2):  
       
         
           
           
               
               
           
         
       
       wherein D represents a cyclic group capable of bonding to m groups of side branches; X independently represents a single bond, a group NR 1  (where R 1  represents a hydrogen atom, or an alkyl group having from 1 to 30 carbon atoms), an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group, or a divalent linking group of a combination thereof; R independently represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group; m indicates an integer of from 2 to 11,  
       
         
           
           
               
               
           
         
       
       wherein R 31  represents an alkyl group, analkenyl group, an alkynyl group, or a cycloalkyl group.  
     
     
         2 . The lubricant composition of  claim 1 , wherein D in formula (1) is a 5- to 7-membered heterocyclic group.  
     
     
         3 . The lubricant composition of  claim 1 , wherein at least one of m groups of Rs in formula (1) contains an ester bond.  
     
     
         4 . The lubricant composition of  claim 1 , wherein the compound of formula (1) is represented by the following formula (3):  
       
         
           
           
               
               
           
         
       
       wherein X 1 , X 2  and X 3  each independently represent a single bond, a group NR 1  (where R 1  represents a hydrogen atom, or an alkyl group having from 1 to 30 carbon atoms), an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group, or a divalent linking group of a combination thereof; R 1 , R 12  and R 13  each independently represent an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group, and at least one of R 11 , R 12  and R 13  contains an ester bond.  
     
     
         5 . The lubricant composition of  claim 4 , wherein X 1 , X 2  and X 3  in formula (3) are a sulfur atom or a group NR 1 .  
     
     
         6 . The lubricant composition of  claim 5 , wherein R 1  is an alkyl having 3 or less carbon atoms or a hydrogen atom.  
     
     
         7 . The lubricant composition of  claim 4 , wherein X 1 , X 2  and X 3  in formula (3) are —NH—.  
     
     
         8 . The lubricant composition of  claim 1 , wherein the compound of formula (1) is represented by the following formula (4):  
       
         
           
           
               
               
           
         
       
       wherein X 21 , X 22  and X 23  each independently represent a single bond, a group NR 1  (where R 1  represents a hydrogen atom, or an alkyl group having from 1 to 30 carbon atoms), an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group, or a divalent linking group of a combination thereof; R 21 , R 22  and R 23  each independently represent a substituent, and at least one of R 21 , R 22  and R 23  contains an ester bond; a21, a22 and a23 each independently indicate an integer of from 1 to 5.  
     
     
         9 . The lubricant composition of  claim 8 , wherein X 21 , X 22  and X 23  in formula (4) are a sulfur atom or a group NR 1 .  
     
     
         10 . The lubricant composition of  claim 8 , wherein R 1  is an alkyl having 3 or less carbon atoms or a hydrogen atom.  
     
     
         11 . The lubricant composition of  claim 8 , wherein X 21 , X 22  and X 23  in formula (4) are —NH—.  
     
     
         12 . The lubricant composition of  claim 8 , wherein at least one of R 21 , R 22  and R 23  in formula (4) is an alkoxy group substituted with a substituent having an ester bond-containing, linear or branched alkyl group.  
     
     
         13 . The lubricant composition of  claim 1 , wherein R 31  in formula (2) is an alkyl, alkenyl, alkynyl or cycloalkyl group substituted with a substituent that contains an alkyl chain having at least 4 carbon atoms in total, an alkyleneoxy chain, a polyfluoroalkyl chain having at least 2 carbon atoms in total, or an organic polysilyl chain.  
     
     
         14 . The lubricant composition of  claim 1 , wherein R 31  in formula (2) is an alkyl group substituted with an alkyleneoxy chain-containing substituent.  
     
     
         15 . The lubricant composition of  claim 1 , wherein the compound of formula (1) and the compound of formula (2) form complexes.  
     
     
         16 . The lubricant composition of  claim 1 , which contains from 0.5 to 5 mols of the compound of formula (2) relative to one mol of the compound of formula (1).  
     
     
         17 . The lubricant composition of  claim 1 , which contains from 1 to 4 mols of the compound of formula (2) relative to one mol of the compound of formula (1).  
     
     
         18 . The lubricant composition of  claim 1 , which contains from 2 to 4 mols of the compound of formula (2) relative to one mol of the compound of formula (1).  
     
     
         19 . The lubricant composition of  claim 1 , which contains the compound of formula (2) more than the compound of formula (1).  
     
     
         20 . The lubricant composition of  claim 1 , which consists of the compound of formula (1) and the compound of formula (2).