Lubricant Composition

Abstract

A lubricant composition includes a base oil present in an amount of greater than 70 parts by weight per 100 parts by weight of the lubricant composition and an antioxidant. The antioxidant has the structure: wherein each X is independently CH or N, so long as at least one X is N, wherein Y is CRR′, NR″, PR″, S, or O, each R, R′ and R″ is independently H, alkyl or aryl, and R″ is alkyl, aryl, alkoxy or aryloxy. Each A is independently an electron donating group. The electron donating group (1) has an atom having at least one lone pair of electrons that is bonded directly to the aromatic ring, (2) is an aryl or alkyl group, or (3) is a hydrogen atom.

1 . A lubricant composition comprising:
 a base oil present in an amount of greater than 70 parts by weight per 100 parts by weight of said lubricant composition; and   an antioxidant having the structure;   
       
         
           
           
               
               
           
         
         wherein each X is independently CH or N, so long as at least one X is N; 
         wherein Y is CRR′, NR″, PR′″, S, or O; 
         wherein each R, R′ and R″ is independently H, alkyl or aryl, and R′″ is alkyl, aryl, alkoxy or aryloxy; and 
         wherein each A is independently an electron donating group that: 
         (1) has an atom having at least one lone pair of electrons that is bonded directly to the aromatic ring; 
         (2) is an aryl or alkyl group; or 
         (3) is a hydrogen atom. 
       
     
     
         2 . The lubricant composition of  claim 1  wherein each A is an electron donating group that has an oxygen atom or nitrogen atom that is bonded directly to the aromatic ring. 
     
     
         3 . The lubricant composition of  claim 1  wherein each of said electron donating groups is chosen from —NR 4   2 , —NH 2 , —OH, —OR 4 , —NHCOR 4 , and —OCOR 4 , wherein R 4  is an alkyl group having 1 to 10 carbon atoms. 
     
     
         4 .- 9 . (canceled) 
     
     
         10 . The lubricant composition of  claim 1  wherein at least one of said electron donating groups is an alkyl group having 1 to 20 carbon atoms. 
     
     
         11 . The lubricant composition of  claim 1  wherein at least one of said electron donating groups is an aryl group. 
     
     
         12 . The lubricant composition of  claim 1  wherein at least one of said electron donating groups is a hydrogen atom. 
     
     
         13 . The lubricant composition of  claim 1  wherein each X is N. 
     
     
         14 . The lubricant composition of  claim 1  wherein at least two of X are N. 
     
     
         15 . The lubricant composition of  claim 1  wherein at least three of X are N. 
     
     
         16 . The lubricant composition of  claim 1  wherein Y is CRR′ and each R and R′ is independently H, alkyl or aryl. 
     
     
         17 . The lubricant composition of  claim 1  wherein Y is NR″ and R″ is H, alkyl or aryl. 
     
     
         18 . The lubricant composition of  claim 1  wherein Y is S. 
     
     
         19 . The lubricant composition of  claim 1  wherein Y is O. 
     
     
         20 . The lubricant composition of  claim 1  wherein Y is PR′″ and R′″ is alkyl, aryl, alkoxy or aryloxy. 
     
     
         21 . The lubricant composition of  claim 1  wherein said antioxidant is present in an amount of from 0.1 to 2 parts by weight per 100 parts by weight of said lubricant composition. 
     
     
         22 . The lubricant composition of  claim 1  wherein said base oil is further defined as an API Group I, Group II or Group III oil. 
     
     
         23 . (canceled) 
     
     
         24 . A method of forming the lubricant composition of  claim 1  comprising the steps of providing the base oil, providing the antioxidant, and combining the base oil and the antioxidant to form the lubricant composition. 
     
     
         25 . An antioxidant having the structure: 
       
         
           
           
               
               
           
         
         wherein each X is independently CH or N, so long as at least one X is N; 
         wherein Y is CRR′, NR″, PR′″, S, or O; 
         wherein each R, R′ and R″ is independently H, alkyl or aryl, and R′″ is alkyl, aryl, alkoxy or aryloxy; and 
         wherein each A is independently an electron donating group that: 
         (1) has an atom having at least one lone pair of electrons that is bonded directly to the aromatic ring; 
         (2) is an aryl or alkyl group; or 
         (3) is a hydrogen atom. 
       
     
     
         26 . A method of forming the antioxidant of  claim 25  comprising the following steps:
 I. reacting Compound A and Compound B to form Compound C according to the following reaction: 
 
       
         
           
           
               
               
           
         
         II. reacting Compound C to form Compound D according to the following reaction: 
       
       
         
           
           
               
               
           
         
         III. reacting Compound D to form Compound E according to the following reaction: and 
       
       
         
           
           
               
               
           
         
         IV. reacting Compound E to form the antioxidant according to the following reaction: 
       
       
         
           
           
               
               
           
         
         wherein R is an n-heptyl group. 
       
     
     
         27 . An additive concentrate package comprising said antioxidant of  claim 25  and one or more metal deactivators, one or more anti-wear additives, and/or one or more additional antioxidants.