Lubricant Compositions Comprising Trimethoxyboroxine To Improve Fluoropolymer Seal Compatibility

Abstract

A lubricant composition including a boroxine compound is disclosed. An additive package including the boroxine compound 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 a formula:   
       
         
           
           
               
               
           
         
       
       and
 a dihydrocarbyldithiophosphate salt. 
 
     
     
         2 . 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. 
     
     
         3 . 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. 
     
     
         4 . The lubricant composition of  claim 1  wherein said lubricant composition comprises less than 0.1 wt. % of acids, anhydrides, triazoles, oxides, or combinations thereof, based on a total weight of said lubricant composition. 
     
     
         5 . The lubricant composition of  claim 1  wherein said dihydrocarbyldithiophosphate salt comprises a zinc dihydrocarbyldithiophosphate salt. 
     
     
         6 . The lubricant composition of  claim 5  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. 
     
     
         7 . The lubricant composition of  claim 1  further comprising a sterically hindered amine compound having a total base number of at least 70 mg KOH/g when tested according to ASTM D4739. 
     
     
         8 . The lubricant composition according to  claim 7 , wherein said sterically hindered amine compound has a general formula (V) or (VI): 
       
         
           
           
               
               
           
         
         wherein each R 4  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 4  are an alkyl group; 
         wherein each R 5  is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms; 
         wherein each R 6  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 6  are an alkyl group; 
         wherein each R 7  is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, and 
         wherein said hydrocarbyl groups designated by R 4 , R 5 , R 6 , and R 7  are each independently an alcohol group, an alkyl group, an amide group, an ether group, or an ester group. 
       
     
     
         9 . The lubricant composition of  claim 7  wherein said sterically hindered amine compound is included in an amount ranging from 0.5 to 5 wt. % based on a total weight of said lubricant composition. 
     
     
         10 . The lubricant composition of  claim 7  wherein said sterically hindered amine compound is (2,2,6,6-tetramethyl-4-piperidyl)dodecanoate. 
     
     
         11 . 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. 
     
     
         12 . The lubricant composition of  claim 1  further comprising a dispersant. 
     
     
         13 . The lubricant composition of  claim 12  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. 
     
     
         14 . The lubricant composition of  claim 13  wherein said dispersant is a polyalkene amine derived from a polyisobutene. 
     
     
         15 . The lubricant composition of  claim 1  wherein said lubricant composition includes less than 100 ppm B(OH) 3   −  ions based on a total weight of said lubricant composition. 
     
     
         16 . A lubricant composition comprising:
 a base oil;   a boroxine compound having a formula:   
       
         
           
           
               
               
           
         
       
       and
 a dispersant. 
 
     
     
         17 . The lubricant composition of  claim 16  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. 
     
     
         18 . The lubricant composition of  claim 16  further comprising a sterically hindered amine compound having a total base number of at least 70 mg KOH/g when tested according to ASTM D4739. 
     
     
         19 . The lubricant composition of  claim 18  wherein said sterically hindered amine compound is included in an amount ranging from 0.5 to 5 wt. % based on a total weight of said lubricant composition. 
     
     
         20 . An additive package for a lubricant composition, said additive package comprising:
 a boroxine compound having general formula:   
       
         
           
           
               
               
           
         
       
       and
 a dihydrocarbyldithiophosphate salt.