Lubricant composition

Abstract

A lubricant oil composition which is excellent in wear resistance, high temperature detergency and base number retaining property, despite its low phosphorus content, low sulfur content and low sulfuric acid ash content, is provided at a low cost by compounding a sulfonamide compound having a specific structure in a base oil.

1 . A lubricant oil composition comprising a base oil and a sulfonamide compound represented by formula (1):
   R 1 —SO 2 —N(R 2 )(R 3 )   (1)
   
       wherein
 R 1  represents one selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group and a substituted or unsubstituted heteroaryl group, and 
 R 2  and R 3  each independently represent one selected from the group consisting of a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl groups group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aryl group and a substituted or unsubstituted heteroaryl group, with the proviso that R 2  and R 3  may together form a ring structure or a condensed ring structure. 
 
     
     
         2 . The composition of  claim 1 , wherein at least one of R 2  and R 3  represents one selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted aryl group and a substituted or unsubstituted heteroaryl group. 
     
     
         3 . The composition according to of  claim 1 , wherein, when at least one of R 2  and R 3  is substituted with at least one substituent, the substituent independently represents a C 1  to C 20  hydrocarbon group. 
     
     
         4 . The composition of  claim 1 , wherein at least one of R 2  and R 3  represents one selected from the group consisting of an unsubstituted alkyl group, an unsubstituted cycloalkyl group, an unsubstituted alkenyl group, an unsubstituted alkynyl group, an unsubstituted aryl group and an unsubstituted heteroaryl group. 
     
     
         5 . The composition  claim 1 , wherein R 1  represents one selected from the group consisting of an unsubstituted alkyl group, an unsubstituted cycloalkyl group, an unsubstituted aryl group and an unsubstituted heteroaryl group. 
     
     
         6 . The composition of  claim 1  having a phosphorus content of 0.12% by mass or less and a sulfuric acid ash content of 1.2% by mass or less, each based on a mass of the composition. 
     
     
         7 . The composition  claim 1 , wherein the composition is suitable for an internal combustion engine. 
     
     
         8 . The composition of  claim 2 , wherein, when at least one of R 2  and R 3  is substituted with at least one substituent, the substituent independently represents a C 1  to C 20  hydrocarbon group. 
     
     
         9 . The composition of  claim 2 , wherein at least one of R 2  and R 3  represents one selected from the group consisting of an unsubstituted alkyl group, an unsubstituted cycloalkyl group, an unsubstituted alkenyl group, an unsubstituted alkynyl group, an unsubstituted aryl group and an unsubstituted heteroaryl group. 
     
     
         10 . The composition of  claim 2 , wherein R 1  represents one selected from the group consisting of an unsubstituted alkyl group, an unsubstituted cycloalkyl group, an unsubstituted aryl group and an unsubstituted heteroaryl group. 
     
     
         11 . The composition of  claim 2  having a phosphorus content of 0.12% by mass or less and a sulfuric acid ash content of 1.2% by mass or less, each based on a mass of the composition. 
     
     
         12 . The composition of  claim 2 , wherein the composition is suitable for an internal combustion engine.