Lubricating Compositions

Abstract

A lubricating composition suited to use in lubricating an internal combustion engine includes an oil of lubricating viscosity and a compound comprising a polyolefin-substituted bridged hydroxyaromatic compound or metal salt thereof, wherein the polyolefin is derived from a isobutylene having a number average molecular weight of 150 to 800.

What is claimed is: 
     
         1 . A lubricating composition comprising:
 an oil of lubricating viscosity; and   a compound comprising a polyolefin-substituted bridged hydroxyaromatic compound or salt thereof, wherein the polyolefin is derived from isobutylene having a number average molecular weight of 150 to 400 and wherein the compound is bridged with a sulfide bridge.   
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . The lubricating composition of  claim 1 , wherein the compound is a metal salt or pnictogen salt. 
     
     
         6 . (canceled) 
     
     
         7 . The lubricating composition of  claim 5 , wherein the metal in the salt comprises calcium. 
     
     
         8 . The lubricating composition of  claim 1 , wherein the metal is overbased. 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . (canceled) 
     
     
         12 . The lubricating composition of  claim 1 , wherein the compound is free of C8 and higher unbranched alkyl chains. 
     
     
         13 . The lubricating composition of  claim 1 , wherein the compound includes a bridged phenate unit represented by the formula: 
       
         
           
           
               
               
           
         
         and salts thereof, 
         where each R1 and each R2 represents a isobutylene group; 
         X represents a sulfide bridging group; 
         Y and Z each represent a terminal group; 
         each n is at least 1; 
         m is at least 1; and 
         p is at least 1. 
       
     
     
         14 . The lubricating composition of  claim 13 , wherein the compound is not coupled with cresol. 
     
     
         15 . The lubricating composition of  claim 13 , wherein n is 1. 
     
     
         16 . (canceled) 
     
     
         17 . (canceled) 
     
     
         18 . The lubricating composition of  claim 13 , wherein each R1 is polyisobutylene having a number average molecular weight of 300 to 400. 
     
     
         19 . The lubricating composition of  claim 1 , wherein the compound has a weight-average molecular weight of 550-5600 in its unsalted form. 
     
     
         20 . (canceled) 
     
     
         21 . The lubricating composition of  claim 1 , wherein the compound is at least 0.01 wt. % up to 20 wt. % of the lubricating composition. 
     
     
         22 . (canceled) 
     
     
         23 . (canceled) 
     
     
         24 . 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. 
     
     
         25 . The lubricating composition of  claim 1 , wherein the oil of lubricating viscosity is at least 10 wt. % up to 95 wt. % of the lubricating composition. 
     
     
         26 . (canceled) 
     
     
         27 . (canceled) 
     
     
         28 . 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. 
     
     
         29 . The lubricating composition of  claim 1 , wherein the lubricating composition has a SAE viscosity grade of XW-Y, wherein X is selected from 0, 5, 10 and 15; and Y is selected from 16, 20, 30, or 40. 
     
     
         30 . (canceled) 
     
     
         31 . A method of lubricating a mechanical device comprising supplying to the device the lubricating composition of  claim 1 . 
     
     
         32 . The method of  claim 31 , wherein the mechanical device comprises an engine or driveline device. 
     
     
         33 . The method of  claim 31 , wherein the mechanical device comprises a heavy duty diesel or marine diesel engine. 
     
     
         34 . A method of forming a lubricating composition comprising:
 reacting a phenol with a branched polyolefin to form a polyolefin-substituted phenol wherein the polyolefin is derived from isobutylene having a number average molecular weight of 150 to 400;   bridging the polyolefin-substituted phenol with a sulfur bridging agent selected;   optionally, reacting the polyolefin-substituted phenol or bridged polyolefin-substituted phenol with a metal base to form a salt; and   combining the bridged polyolefin-substituted phenol or salt with an oil of lubricating viscosity.   
     
     
         35 . The method of  claim 34 , wherein the reaction between the phenol and the branched polyolefin is carried out in the presence of a catalyst. 
     
     
         36 . The method of  claim 34 , wherein a ratio of phenol to polyolefin in the reaction is at least 2:1. 
     
     
         37 . (canceled)