Lubricating Composition Containing a Dispersant

Abstract

The invention provides a lubricating composition containing a compound comprising the reaction product of a polyolefin, an ethylenically unsaturated aromatic acylating agent (or carboxylic reactant), and an amine, and an oil of lubricating viscosity. The invention further relates to the use of the lubricating composition in an internal combustion engine.

1 .- 20 . (canceled) 
     
     
         21 . A lubricating composition comprising an oil of lubricating viscosity and 0.1 wt % to 15 wt % of a compound comprising the reaction product of a polyolefin, an ethylenically unsaturated aromatic acylating agent, and an amine,
 wherein the amine is an acyclic polyamine,   wherein the polyolefin is a polybutene, and   wherein the lubricating composition has a sulphated ash content of 0.3 wt % to 1.2 wt % of the lubricating composition.   
     
     
         22 . The lubricating composition of  claim 21 , wherein the amine is an ethylenepolyamine. 
     
     
         23 . The lubricating composition of  claim 22 , wherein the ethylenepolyamine is selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, polyamine still bottoms, and mixtures thereof. 
     
     
         24 . The lubricating composition of  claim 21 , wherein the polyolefin is derivable from an olefin with 2 to 4 carbon atoms. 
     
     
         25 . The lubricating composition of  claim 21 , wherein the polyolefin is a polyisobutylene. 
     
     
         26 . The lubricating composition of  claim 21 , wherein the polyolefin is a copolymer, wherein the polyolefin is a butene and isoprene copolymer, or an ethylene-α-olefin copolymer. 
     
     
         27 . The lubricating composition of  claim 26 , wherein the ethylene-α-olefin copolymer is an ethylene-propylene copolymer. 
     
     
         28 . The lubricating composition of  claim 21 , wherein the ethylenically unsaturated aromatic acylating agent is cis-cinnamic acid, trans-cinnamic acid, or mixtures thereof. 
     
     
         29 . The lubricating composition of  claim 21 , wherein the compound is obtained by a process comprising:
 (1) reacting the polyolefin with the ethylenically unsaturated aromatic acylating agent; and   (2) reacting the product of step (1) with the amine.   
     
     
         30 . The lubricating composition of  claim 21 , wherein the compound is non-borated. 
     
     
         31 . The lubricating composition of  claim 21 , wherein the compound is present at 2 wt % to 12 wt %, of the lubricating composition. 
     
     
         32 . The lubricating composition of  claim 21 , wherein the lubricating composition has a sulphated ash content of 0.5 wt % to 1.1 wt % of the lubricating composition. 
     
     
         33 . The lubricating composition of  claim 21  further comprising an overbased metal-containing detergent, wherein the overbased metal-containing detergent is selected from the group consisting of non-sulphur containing phenates, sulphur containing phenates, sulphonates, salixarates, salicylates, and mixtures thereof. 
     
     
         34 . A method of lubricating an internal combustion engine comprising supplying to the internal combustion engine a lubricating composition comprising the lubricating composition of  claim 21 . 
     
     
         35 . A lubricating composition comprising an oil of lubricating viscosity and 0.1 wt % to 15 wt % of a compound comprising the reaction product of a polyolefin, an ethylenically unsaturated aromatic acylating agent (or carboxylic reactant), and an amine, wherein the aromatic amine is selected from the group consisting of aniline, nitroaniline, aminocarbazole, 4-aminodiphenylamine (ADPA), and coupling products of ADPA. 
     
     
         36 . The lubricating composition of  claim 35 , wherein the aromatic amine is 4-aminodiphenylamine or coupling products of 4-aminodiphenylamine. 
     
     
         37 . The lubricating composition of  claim 34 , wherein the polyolefin is a polyisobutylene. 
     
     
         38 . The lubricating composition of  claim 34 , wherein the polyolefin is a copolymer, wherein the polyolefin is a butene and isoprene copolymer, or an ethylene-α-olefin copolymer. 
     
     
         39 . The lubricating composition of  claim 34 , wherein the lubricating composition has a sulphated ash content of 0.5 wt % to 1.1 wt % of the lubricating composition. 
     
     
         40 . A method of lubricating an internal combustion engine comprising supplying to the internal combustion engine a lubricating composition comprising the lubricating composition of  claim 34 .