Lubricant Compositions Comprising Trimethoxyboroxines and Sterically Hindered Amines To Improve Fluoropolymer Seal Compatibilty

Abstract

A lubricant composition including a boroxine compound is disclosed. A lubricant composition and additive package including a boroxine compound and a sterically hindered amine compound are 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 sterically hindered amine compound included in an amount ranging from 0.5 to 5 wt. % based on a total weight of said lubricant composition. 
       
     
     
         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 said 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 said 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 sterically hindered amine compound comprises at least one piperidine ring and at least one ester group. 
     
     
         5 . The lubricant composition of  claim 1  wherein said sterically hindered amine compound is (2,2,6,6-tetramethyl-4-piperidyl) dodecanoate. 
     
     
         6 . The lubricant composition of  claim 1  wherein said sterically hindered amine compound has a total base number of at least 70 mg KOH/g when tested according to ASTM D4739. 
     
     
         7 . 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. 
     
     
         8 . The lubricant composition of  claim 1  further comprising a dispersant. 
     
     
         9 . The lubricant composition of  claim 8  wherein said dispersant is a polyalkene amine derived from a polyisobutene. 
     
     
         10 . The lubricant composition of  claim 9  wherein said dispersant is included in said lubricant composition in an amount ranging from 0.01 to 15 wt. % based on said total weight of said lubricant composition. 
     
     
         11 . The lubricant composition of  claim 1  further comprising a dihydrocarbyldithiophosphate salt. 
     
     
         12 . The lubricant composition of  claim 11  wherein said dihydrocarbyldithiophosphate salt comprises a zinc dihydrocarbyldithiophosphate salt. 
     
     
         13 . The lubricant composition of  claim 11  wherein said dihydrocarbyldithiophosphate salt is included in said lubricant composition in an amount ranging from 0.1 to 20 wt. % based on said total weight of said lubricant composition. 
     
     
         14 . 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 or 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. 
     
     
         15 . A lubricant composition comprising:
 a base oil;   a boroxine compound having a formula:   
       
         
           
           
               
               
           
         
          and 
         a sterically hindered amine compound having the general formula (I) or (II): 
       
       
         
           
           
               
               
           
         
         
           wherein each R 1  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 1  are an alkyl group; 
           wherein each R 2  is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms; 
           wherein each R 3  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 3  are an alkyl group; 
           wherein each R 4  is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, and 
           wherein said hydrocarbyl groups designated by R 1 , R 2 , R 3 , and R 4  are each independently an alcohol group, an alkyl group, an amide group, an ether group, or an ester group. 
         
       
     
     
         16 . The lubricant composition of  claim 15  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. 
     
     
         17 . The lubricant composition of  claim 15  wherein said amine compound is included in an amount ranging from 0.5 to 5 wt. % based on a total weight of said lubricant composition. 
     
     
         18 . The lubricant composition of  claim 15  further comprising a dispersant. 
     
     
         19 . The lubricant composition of  claim 15  further comprising a dihydrocarbyldithiophosphate salt. 
     
     
         20 . An additive package for a lubricant composition, said additive package comprising:
 a boroxine compound having a formula:   
       
         
           
           
               
               
           
         
          and 
         a sterically hindered amine compound having the general formula (I) or (II): 
       
       
         
           
           
               
               
           
         
         
           wherein each R 1  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 1  are an alkyl group; 
           wherein each R 2  is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms; 
           wherein each R 3  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 3  are an alkyl group; 
           wherein each R 4  is independently a hydrogen atom or a hydrocarbyl group having from 1 to 17 carbon atoms, and 
           wherein said hydrocarbyl groups designated by R 1 , R 2 , R 3 , and R 4  are each independently an alcohol group, an alkyl group, an amide group, an ether group, or an ester group.