Lubricant Compositions Comprising Boroxines and Amine Compounds To Improve Fluoropolymer Seal Compatibility

Abstract

A lubricant composition including a boroxine compound is disclosed. A lubricant composition and additive package including a boroxine compound and an amine compound are also disclosed. A method of lubricating a system comprising a fluoropolymer seal with the lubricant composition is also disclosed. The boroxine compound of the lubricant composition acts to improve compatibility of the lubricant composition with a fluoropolymer seal.

What is claimed: 
     
         1 . A lubricant composition comprising:
 a base oil;   a boroxine compound having general formula (I):   
       
         
           
           
               
               
           
         
         
           wherein each R 1  is independently an alkyl group having from 1 to 7 carbon atoms; and 
         
         an amine compound having a total base number of at least 80 mg KOH/g when tested according to ASTM D4739. 
       
     
     
         2 . The lubricant composition of  claim 1  wherein each R 1  is independently an alkyl group having from 1 to 5 carbon atoms. 
     
     
         3 . The lubricant composition of  claim 1  wherein said boroxine compound is included in an amount ranging from 0.1 to 5 wt. % based on a total weight of said lubricant composition. 
     
     
         4 . The lubricant composition of  claim 1  wherein at least 50 wt. % of said boroxine compound remains unreacted in said lubricant composition based on a total weight of said boroxine compound utilized to form said lubricant composition prior to any reaction in said lubricant composition. 
     
     
         5 . The lubricant composition of  claim 1  wherein said amine compound is included in an amount ranging from 0.1 to 20 wt. % based on a total weight of said lubricant composition. 
     
     
         6 . The lubricant composition of  claim 1  wherein said amine compound comprises at least one piperidine ring and at least one ester group. 
     
     
         7 . The lubricant composition of  claim 1  wherein said amine compound is (2,2,6,6-tetramethyl-4-piperidyl)dodecanoate. 
     
     
         8 . The lubricant composition of  claim 1  wherein said amine compound consists essentially of hydrogen, carbon, nitrogen, and oxygen or wherein said amine compound consists essentially of hydrogen, carbon, and nitrogen. 
     
     
         9 . The lubricant composition of  claim 1  wherein said lubricant composition is free of a phosphate amine salt. 
     
     
         10 . The lubricant composition of  claim 1  wherein said base oil has a viscosity ranging from 1 to 20 cSt when tested at 100° C. according to ASTM D445 and is selected from the group of API group I oils, API group II oils, API group III oils, API group IV oils, API group V oils, and combinations thereof. 
     
     
         11 . The lubricant composition of  claim 1  further comprising a dispersant. 
     
     
         12 . The lubricant composition of  claim 11  wherein said dispersant is included in said lubricant composition in an amount ranging from 0.01 to 15 wt. % based on a total weight of said lubricant composition. 
     
     
         13 . The lubricant composition of  claim 12  wherein said dispersant is a polyalkene amine derived from a polyisobutene. 
     
     
         14 . The lubricant composition of  claim 1  further comprising a dihydrocarbyldithiophosphate salt. 
     
     
         15 . The lubricant composition of  claim 14  wherein said dihydrocarbyldithiophosphate salt comprises a zinc dihydrocarbyldithiophosphate salt. 
     
     
         16 . The lubricant composition of  claim 14  wherein said dihydrocarbyldithiophosphate salt is included in said lubricant composition in an amount ranging from 0.1 to 10 wt. % based on a total weight of said lubricant composition. 
     
     
         17 . The lubricant composition of  claim 1  wherein said lubricant composition has a fluoropolymer seal compatibility such that a fluoropolymer seal submerged in said lubricant composition exhibits a change in tensile strength of less than 45% when tested according to CEC L-39-T96. 
     
     
         18 . The lubricant composition of  claim 1  wherein said lubricant composition has a fluoropolymer seal compatibility such that a fluoropolymer seal submerged in said lubricant composition exhibits a change in elongation at rupture of less than 60% when tested according to CEC L-39-T96. 
     
     
         19 . A method of lubricating a system comprising a fluoropolymer seal, said method comprising:
 providing a lubricant composition comprising a base oil, a boroxine compound, and an amine compound having a total base number of at least 80 mg KOH/g when tested according to ASTM D4739; and   contacting the fluoropolymer seal with the lubricant composition,
 wherein the boroxine compound has general formula (I): 
   
       
         
           
           
               
               
           
         
       
       and
 wherein each R 1  is independently an alkyl group having from 1 to 7 carbon atoms. 
 
     
     
         20 . A lubricant composition comprising:
 a base oil;   a boroxine compound having general formula (I):   
       
         
           
           
               
               
           
         
         
           wherein each R 1  is independently an alkyl group having from 1 to 7 carbon atoms; and 
         
         an amine compound selected from the group consisting of:
 a) a sterically hindered amine compound having the general formula (VI) or (VII): 
 
       
       
         
           
           
               
               
           
         
         
           
             wherein each R 5  is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, and wherein at least two groups designated by R 5  are an alkyl group; 
             wherein each R 6  is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms; 
             wherein each R 7  is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, and wherein at least two groups designated by R 7  are an alkyl group; 
             wherein each R 8  is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, and 
             wherein said hydrocarbyl groups designated by R 5 , R 6 , R 7 , and R 8  are each independently an alcohol group, an alkyl group, an amide group, an ether group, or an ester group; 
           
           b) a monomeric acyclic amine compound having a weight average molecular weight of less than 500 and consisting of covalent bonds; 
           c) a monomeric cyclic amine compound having a weight average molecular weight of less than 500 and including no more than two nitrogen atoms; and 
           d) combinations thereof. 
         
       
     
     
         21 . The lubricant composition of  claim 20  wherein each R 1  is independently an alkyl group having from 1 to 5 carbon atoms. 
     
     
         22 . The lubricant composition of  claim 20  wherein said boroxine compound is included in an amount ranging from 0.1 to 5 wt. % based on a total weight of said lubricant composition. 
     
     
         23 . The lubricant composition of  claim 20  wherein at least 50 wt. % of said boroxine compound remains unreacted in said lubricant composition based on a total weight of said boroxine compound utilized to form said lubricant composition prior to any reaction in said lubricant composition. 
     
     
         24 . The lubricant composition of  claim 20  wherein said amine compound is included in an amount ranging from 0.1 to 20 wt. % based on a total weight of said lubricant composition. 
     
     
         25 . The lubricant composition of  claim 20  wherein said amine compound is said monomeric acyclic amine compound. 
     
     
         26 . The lubricant composition of  claim 20  wherein said amine compound is said sterically hindered amine compound. 
     
     
         27 . The lubricant composition of  claim 20  wherein said amine compound is said monomeric cyclic amine compound. 
     
     
         28 . The lubricant composition of  claim 20  wherein said base oil has a viscosity ranging from 1 to 20 cSt when tested at 100° C. according to ASTM D445 and is selected from the group of API group I oils, API group II oils, API group III oils, API group IV oils, API group V oils, and combinations thereof. 
     
     
         29 . The lubricant composition of  claim 20  further comprising a dispersant. 
     
     
         30 . The lubricant composition of  claim 29  wherein said dispersant is included in said lubricant composition in an amount ranging from 0.01 to 15 wt. % based on a total weight of said lubricant composition. 
     
     
         31 . The lubricant composition of  claim 20  further comprising a dihydrocarbyldithiophosphate salt. 
     
     
         32 . The lubricant composition of  claim 31  wherein said dihydrocarbyldithiophosphate salt comprises a zinc dihydrocarbyldithiophosphate salt. 
     
     
         33 . The lubricant composition of  claim 31  wherein said dihydrocarbyldithiophosphate salt is included in said lubricant composition in an amount ranging from 0.1 to 10 wt. % based on a total weight of a lubricant composition. 
     
     
         34 . An additive package for a lubricant composition, said additive package comprising:
 a boroxine compound having general formula (I):   
       
         
           
           
               
               
           
         
         
           wherein each R 1  is independently an alkyl group having from 1 to 7 carbon atoms; and 
         
         an amine compound having a total base number of at least 80 mg KOH/g when tested according to ASTM D4739. 
       
     
     
         35 . The additive package of  claim 34  wherein each R 1  is independently an alkyl group having from 1 to 5 carbon atoms.