Titanium and molybdenum compounds and complexes as additives in lubricants

Abstract

A lubricating composition comprising an oil of lubricating viscosity, 1 to 1000 parts per million by weight of titanium in the form of an oil-soluble titanium-containing material, and at least one additional lubricant additive provides beneficial effects on properties such as deposit control, oxidation, and filterability in engine oils.

What is claimed is: 
     
         1 . A lubricating composition comprising:
 an oil of lubricating viscosity;   about 5 to about 100 parts per million by weight of titanium in the form of an oil-soluble titanium-containing material which comprises a titanium (IV) alkoxide or a titanium (IV) neodecanoate or mixtures thereof;   about 50 to about 150 parts per million by weight molybdenum in the form of an oil-soluble molybdenum-containing material comprising a molybdenum hydrocarbyldithiocarbamate; and   about 0.3 to about 3 percent by weight of a hindered phenolic antioxidant.   
     
     
         2 . The lubricating composition of  claim 1 , wherein the amount of molybdenum is about 70 to about 150 parts per million by weight. 
     
     
         3 . The lubricating composition of  claim 1 , wherein the hindered phenolic antioxidant comprises a hindered phenolic ester antioxidant. 
     
     
         4 . The lubricating composition of  claim 1 , wherein the amount of the phenolic antioxidant is about 0.7 to about 2.0 percent by weight. 
     
     
         5 . The lubricating composition of  claim 1 , wherein the amount of phosphorus in said composition is less than about 1000 parts per million by weight. 
     
     
         6 . The lubricating composition of  claim 1 , further comprising at least one additive selected from the group consisting of an anti-wear agent and a dispersant. 
     
     
         7 . The lubricating composition of  claim 1 , further comprising a sodium-containing detergent in an amount to contribute about 100 to about 2000 parts per million weight sodium to the composition. 
     
     
         8 . The lubricating composition of  claim 1 , further comprising about 0.1 to about 2.0 weight percent of a component comprising a hydroxycarboxylic acid or an ester, amide, imide, or salt thereof, or a derivative thereof with multiple of the foregoing functionalities. 
     
     
         9 . The lubricating composition of  claim 1 , wherein the oil-soluble titanium-containing material has a number average molecular weight of less than about 20,000. 
     
     
         10 . A lubricating composition comprising:
 an oil of lubricating viscosity;   about 5 to about 100 parts per million by weight of titanium in the form of an oil-soluble titanium-containing material which comprises a titanium (IV) alkoxide or a titanium (IV) neodecanoate or mixtures thereof; and   about 0.1 to about 2.0 weight percent of a component comprising a hydroxycarboxylic acid or an ester, amide, imide, or salt thereof, or a derivative thereof with multiple of the foregoing functionalities.   
     
     
         11 . The lubricating composition of  claim 10 , wherein the hydroxycarboxylic acid or an ester, amide, imide, or salt thereof, or a derivative thereof of comprises tartaric acid, malic acid, glycolic acid, or citric acid or an ester, amide, imide, or salt thereof. 
     
     
         12 . The lubricating composition of  claim 10 , wherein the hydroxycarboxylic acid or an ester, amide, imide, or salt thereof, or a derivative thereof comprises oleyl tartrimide or a diester of tartaric acid and one or more alcohols of about 8 to about 18 carbon atoms. 
     
     
         13 . The lubricating composition of  claim 10 , further comprising a metal-containing detergent other than a Ti-containing detergent. 
     
     
         14 . The lubricating composition of  claim 13 , wherein the metal-containing detergent comprises a sodium-containing detergent. 
     
     
         15 . The lubricating composition of  claim 14 , wherein the sodium-containing detergent contributes about 100 to about 2000 parts per million by weight sodium to the lubricating composition. 
     
     
         16 . The lubricating composition of  claim 10  further comprising: about 50 to about 150 parts per million by weight molybdenum in the form of an oil-soluble molybdenum-containing material comprising a molybdenum hydrocarbyldithiocarbamate. 
     
     
         17 . A method for lubricating an internal combustion engine, comprising supplying to said engine the lubricating composition of  claim 1 . 
     
     
         18 . A method for lubricating an internal combustion engine, comprising supplying to said engine the lubricating composition of  claim 16 .