Lubricating oil compositions

Abstract

A lubricating oil composition comprising a major amount of oil of lubricating viscosity and a minor amount of one or more compounds of formula (I): wherein R 1 , R 2 , R 3 , R 4 and R 5 independently represent alkyl or substituted alkyl having no aryl substituent.

1 . A lubricating oil composition comprising a major amount of oil of lubricating viscosity and a minor amount of one or more compounds of formula (I): 
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2 , R 3 , R 4  and R 5  independently represent alkyl or substituted alkyl having no aryl substituent. 
     
     
         2 . A lubricating oil composition according to  claim 1  wherein R 1  represents methyl or ethyl. 
     
     
         3 . A lubricating oil composition according to  claim 2  wherein R 1  represents methyl. 
     
     
         4 . A lubricating oil composition according to  claim 1  wherein R 3  represents methyl or ethyl. 
     
     
         5 . A lubricating oil composition according to  claim 4  wherein R 3  represents ethyl. 
     
     
         6 . A lubricating oil composition according to  claim 1  wherein R 5  represents methyl or ethyl. 
     
     
         7 . A lubricating oil composition according to  claim 6  wherein R 5  represents ethyl. 
     
     
         8 . A lubricating oil composition according to  claim 1  having a TBN of at least 6 mg KOH/g, as measured in accordance with ASTM D-4739. 
     
     
         9 . A lubricating oil composition according to  claim 8  having a TBN of from 6 to 15 mg KOH/g, as measured in accordance with ASTM D-4739. 
     
     
         10 . A lubricating oil composition according to  claim 1  having a SASH content of no greater than 1.1 mass %. 
     
     
         11 . A lubricating oil composition according to  claim 10  having a SASH content of no greater than 1.0 mass %. 
     
     
         12 . A lubricating oil composition according to  claim 11  having a SASH content of no greater than 0.8 mass %. 
     
     
         13 . A lubricating oil composition according to  claim 1  wherein at least 10% of the compositional TBN, as measured in accordance with ASTM D-4379 is derived from ashless TBN sources including at least one compound of formula (I). 
     
     
         14 . A lubricating oil composition according to  claim 13  wherein at least 15% of the compositional TBN, as measured in accordance with ASTM D-4379 is derived from ashless TBN sources including at least one compound of formula (I). 
     
     
         15 . A lubricating oil composition according to  claim 14  wherein at least 20% of the compositional TBN, as measured in accordance with ASTM D-4379 is derived from ashless TBN sources including at least one compound of formula (I). 
     
     
         16 . A lubricating oil composition according to  claim 1  having a sulfur content of less than 0.4 mass, and no greater than 1200 ppm of phosphorus. 
     
     
         17 . A concentrate for the preparation of a lubricating oil composition according to  claim 1 , the concentrate comprising from about 2.5 to about 30 mass % of one or more compounds of formula (I) as defined in  claim 1 ; about 10 to about 40 mass % of a nitrogen-containing dispersant; about 2 to about 20 mass % of an aminic antioxidant, a phenolic antioxidant, a molybdenum compound, or a mixture thereof; about 5 to 40 mass % of a detergent; and from about 2 to about 20 mass % of a metal dihydrocarbyl dithiophosphate. 
     
     
         18 . A compound of formula (I): 
       
         
           
           
               
               
           
         
         wherein R 1 , R 2 , R 3 , R 4  and R 5  independently represent alkyl or substituted alkyl having no aryl substituent. 
       
     
     
         19 . A method of increasing the TBN of a lubricating oil composition without concurrently increasing the SASH content, the method comprising adding to the lubricating oil composition one or more compounds according to  claim 10 .