Marine diesel cylinder lubricant oil compositions

Abstract

A marine diesel cylinder lubricating oil composition includes a major amount of an oil of lubricating viscosity. The lubricating oil composition further includes a non-sulfur containing aromatic amine. The marine diesel cylinder lubricating oil composition has a total base number (TBN) of about 5 to about 100 mg KOH/g. Furthermore, the contribution of the non-sulfur containing aromatic amine to the TBN of the marine diesel cylinder lubricant oil composition is greater than about 30%.

What is claimed is: 
     
         1 . A marine diesel cylinder lubricating oil composition comprising:
 (a) a major amount of an oil of lubricating viscosity, and   (b) a non-sulfur containing aromatic amine;   wherein the marine diesel cylinder lubricating oil composition has a total base number (TBN) of about 5 to about 100 mg KOH/g; and further wherein the contribution of the non-sulfur containing aromatic amine to the TBN of the marine diesel cylinder lubricant oil composition is greater than about 30%.   
     
     
         2 . The marine diesel cylinder lubricant oil composition according to  claim 1 , wherein the non-sulfur containing aromatic amine is selected from a diphenylamine, a N-phenylnaphthylamine, a dinaphthylamine, or a phenylenediamine. 
     
     
         3 . The marine diesel cylinder lubricant oil composition according to  claim 1 , wherein the non-sulfur containing aromatic amine consists essentially of a diphenylamine. 
     
     
         4 . The marine diesel cylinder lubricant oil composition according to  claim 3 , wherein the diphenylamine is selected from diphenylamine, N-methyldiphenylamine, 4-butyldiphenylamine, 4,4′-dibutyldiphenylamine, 4-hexyldiphenylamine, 4,4′-dihexyldiphenylamine, 4-heptyldiphenylamine, 4,4′-diheptyldiphenylamine, 4-octyidiphenylamine, 4,4′-dioctyldiphenylamine , 4-nonyldiphenylamine, 4,4′-dinonyldiphenylamine, or 4-tetradecyldiphenylamine, 4,4′-ditetradecyldiphenylamine, p,p′-di-α-methylbenzyl-diphenylamine; N-p-butylphenyl-N-p′-octylphenylamine, or bis(dialkylphenyl) amines. 
     
     
         5 . The marine diesel cylinder lubricant oil composition according to  claim 1 , wherein the non-sulfur containing aromatic amine is selected from alkylphenyl-1-naphthylamines, octylphenyl-1-naphthylamine, N-4-dodecylphenyl-1-naphthylamine; 1-naphthylamine; an arylnaphthylamine, phenyl-1-naphthylamine, phenyl-2-naphthylamine, N-hexylphenyl-2-naphthylamine, N-octylphenyl-2-naphthylamine, phenylenediamines, N,N′-diisopropyl-p-phenylenediamine, or N,N′-diphenyl-p-phenylenediamine. 
     
     
         6 . The marine diesel cylinder lubricant oil composition according to  claim 1 , wherein the contribution of the non-sulfur containing aromatic amine to TBN of the marine diesel cylinder lubricant oil composition is greater than about 32%, greater than about 34%, greater than about 36%, greater than about 38%, greater than about 40%, greater than about 42%, greater than about 44%, greater than about 46%, greater than about 48%, greater than about 50%, greater than about 52%, greater than about 54%, greater than about 56%, greater than about 58%, greater than about 60%, greater than about 62%, greater than about 64%, greater than about 66%, greater than about 68%, greater than about 70%, greater than about 72%, greater than about 74%, greater than about 76%, greater than about 78%, greater than about 80%, greater than about 82%, greater than about 84%, greater than about 86%, greater than about 88%, or greater than about 90%. 
     
     
         7 . The marine diesel cylinder lubricant oil composition according to  claim 1 . wherein the contribution of the non-sulfur containing aromatic amine to TBN of the marine diesel cylinder lubricant oil composition is not greater than about 95%, not greater than about 90%, not greater than about 85%, not greater than about 80%, not greater than about 75%, not greater than about 70%, not greater than about 65%, not greater than about 60%, not greater than about 55%, or not greater than about 50%. 
     
     
         8 . The marine diesel cylinder lubricant oil composition according to  claim 1 , wherein the contribution of the non-sulfur containing aromatic amine to TBN of the marine diesel cylinder lubricant oil composition is between 30% and 95%, between 32% and 85%, between 34% and 75%, between 36% and 65%. 
     
     
         9 . The marine diesel cylinder lubricant oil composition according to  claim 1  further comprising a detergent selected from an alkyl-substituted hydroxyaromatic carboxylate, or an alkyl-substituted hydroxyaromatic compound. 
     
     
         10 . The marine diesel cylinder lubricant oil composition according to  claim 1 , wherein the non-sulfur containing aromatic amine has a total base number between 100 mg KOH/g and 600 mg KOH/g, between 100 mg KOH/g and 300 mg KOH/g, or between 120 mg KOH/g and 250 mg KOH/g. 
     
     
         11 . The marine diesel cylinder lubricant oil composition according to  claim 1  having the TBN between 5 and 70 mg KOH/g or between 5 and 40 mg KOH/g. 
     
     
         12 . A marine diesel cylinder lubricating oil composition comprising:
 (a) a major amount of an oil of lubricating viscosity, and   (b) a non-sulfur containing aromatic amine;   
       wherein the non-sulfur containing aromatic amine is present in an amount sufficient to increase oxidation stability of the marine diesel cylinder lubricating oil composition as determined by ASTM D-6186 by at least 5% compared to a marine diesel cylinder lubricating oil composition substantially deficient of any non-sulfur containing aromatic amine. 
     
     
         13 . The marine diesel cylinder lubricating oil composition according to  claim 12 , wherein the oxidation stability is increased by at least 7%, at least 9%, at least 11%, at least 13%, or at least 15%. 
     
     
         14 . The marine diesel cylinder lubricating oil composition according to  claim 12 , wherein the marine diesel cylinder lubricating oil composition substantially deficient of any non-sulfur containing aromatic amine includes a non-sulfur containing aromatic amine in an amount of less than 0.5 wt %, less than 0.4 wt %, less than 0.3 wt %, or less than 0.2 wt %. 
     
     
         15 . The marine diesel cylinder lubricant oil composition according to  claim 12 , wherein the non-sulfur containing aromatic amine is selected from alkylphenyl-1-naphthylamines, octylphenyl- 1 -naphthylamine, N-4-dodecylphenyl-1-naphthlamine; 1-naphthlamine; an arylnaphthylamine, phenyl-1-naphthylamine, phenyl-2-naphthylamine, N-hexylphenyl-2-naphthylamine, N-octylphenyl-2-naphthylamine, phenylenediamines, N,N′-diisopropyl-p-phenylenediamine, or N,N′-diphenyl-p-phenylenediamine.