Alkylphenol detergents

Abstract

The disclosed technology provides a lubricating composition comprising an oil of lubricating viscosity and a detergent comprising a polyolefin-substituted hydroxy-aromatic carboxylic acid or salt thereof, wherein the polyolefin is derived from a branched alkene having at least 4 carbon atoms and wherein the polyolefin has a number average molecular weight of 150 to 800. The invention further relates to a method of lubricating a mechanical device with the lubricant composition.

What is claimed: 
     
         1 . A lubricating composition comprising:
 (a) an oil of lubricating viscosity; and   (b) a detergent consisting of an alkylsalicylate represented by the structure   
       
         
           
           
               
               
           
         
       
       where R represent polyisobutylene having a number average molecular weight of 150 to 400 and wherein the detergent comprises up to 5 wt % of the lubricating composition. 
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . (canceled) 
     
     
         7 . (canceled) 
     
     
         8 . (canceled) 
     
     
         9 . The lubricating composition of  claim 1 , wherein the detergent is a metal salt. 
     
     
         10 . The lubricating composition of  claim 9 , wherein the metal in the salt comprises calcium. 
     
     
         11 . The lubricating composition of  claim 9 , wherein the metal is overbased. 
     
     
         12 . The lubricating composition of  claim 1 , wherein the detergent is free of C8 and higher unbranched alkyl chains. 
     
     
         13 . (canceled) 
     
     
         14 . (canceled) 
     
     
         15 . (canceled) 
     
     
         16 . (canceled) 
     
     
         17 . The lubricating composition of  claim 1 , wherein the polyisobutylene has a number average molecular weight of 300 to 400. 
     
     
         18 . The lubricating composition of  claim 1 , wherein the alkylsalicylate is at least 0.01 wt. % of the lubricating composition. 
     
     
         19 . The lubricating composition of  claim 18 , wherein the alkylsalicylate is at least 0.1 wt. %. 
     
     
         20 . The lubricating composition of  claim 18 , wherein the alkylsalicylate is up to 20 wt. of the lubricating composition. 
     
     
         21 . The lubricating composition of  claim 1 , wherein the oil of lubricating viscosity comprises at least one of an API Group I, II, III, IV, and V base oil. 
     
     
         22 . The lubricating composition of  claim 1 , wherein the oil of lubricating viscosity is at least 10 wt. % of the lubricating composition. 
     
     
         23 . The lubricating composition of  claim 22 , wherein the oil of lubricating viscosity is at least 30 wt. % of the lubricating composition. 
     
     
         24 . The lubricating composition of  claim 1 , wherein the oil of lubricating viscosity is up to 95 wt. % of the lubricating composition. 
     
     
         25 . The lubricating composition of  claim 1 , further comprising at least one of the group consisting of detergents, antioxidants, dispersants, antiwear agents, friction modifiers, corrosion inhibitors, and combinations thereof. 
     
     
         26 . A method of lubricating a mechanical device comprising supplying to the device the lubricating composition of  claim 1 . 
     
     
         27 . The method of  claim 26 , wherein the mechanical device comprises an engine or driveline device. 
     
     
         28 . The method of  claim 26 , wherein the mechanical device comprises a heavy duty diesel or marine diesel engine. 
     
     
         29 . The method of  claim 26 , wherein the mechanical device is a hydraulic system, turbine system, or circulating oil system. 
     
     
         30 . The method of  claim 27 , wherein the mechanical device is a transmission. 
     
     
         31 . (canceled) 
     
     
         32 . A method of forming a lubricating composition comprising:
 (i) forming an alkylsalicylate represented by the structure   
       
         
           
           
               
               
           
         
         where R represents polyisobutylene having a number average molecular weight of 150 to 400 and wherein the detergent comprises up to 5 wt. % of the lubricating composition; 
         (ii) optionally, reacting the alkylsalicylate with a metal base in the presence of carbon dioxide to form a metal salt; and 
         (iii) combining the alkylsalicylate metal salt thereof with an oil of lubricating viscosity.