lubricating oil additive composition and method of making the same

Abstract

An oil-soluble lubricating oil additive composition prepared by a process which comprises reacting a succinimide, succinamide or mixtures thereof with a first post-treating agent, thereby producing an initial post-treated product which is reacted with a second post-treating agent.

1 . A lubricating oil additive composition prepared by a process which comprises the steps of:
 (A) reacting a polyalkenyl succinic acid or a polyalkenyl succinic anhydride with at least one polyalkylene polyamine, having at least three nitrogen atoms, thereby producing a succinimide or succinamide or mixtures thereof;   (B) reacting the product of step (A) with a phthalic anhydride or naphthalic anhydride post-treating agent or mixtures thereof, thereby producing an initial post-treated succinimide or succinamide or mixtures thereof; and   (C) reacting the product of step (B) with a cyclic carbonate thereby producing a final post-treated succinimide or succinamide or mixtures thereof, wherein at least one basic nitrogen remains in the final post-treated succinimide or succinamide or mixtures thereof.   
   
   
       2 . The lubricating oil additive composition of  claim 1  wherein the polyalkenyl succinic acid or the polyalkenyl succinic anhydride is derived from a polyisobutene having a number average molecular weight (M n ) of from about 500 to about 5000. 
   
   
       3 . The lubricating oil additive composition of  claim 2  wherein the polyalkenyl succinic acid or the polyalkenyl succinic anhydride is derived from a polyisobutene having a number average molecular weight (M n ) of from about 700 to about 3000. 
   
   
       4 . The lubricating oil additive composition of  claim 1  wherein the polyalkylene polyamine is selected from diethylenetriamine, triethylenetetraamine, tetraethylenepentamine, pentaethylenehexamine, heavy polyamine, or mixtures thereof. 
   
   
       5 . The lubricating oil additive composition of  claim 4  wherein the polyalkylene polyamine is heavy polyamine. 
   
   
       6 . The lubricating oil additive composition of  claim 4  wherein the polyalkylene polyamine is tetraethylenepentamine. 
   
   
       7 . The lubricating oil additive composition of  claim 1  wherein the the cyclic carbonate is selected from ethylene carbonate, propylene carbonate, or butylene carbonate. 
   
   
       8 . A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and a minor amount of a lubricating oil additive composition prepared by the process which comprises the steps of:
 (A) reacting a polyalkenyl succinic acid or a polyalkenyl succinic anhydride with at least one polyalkylene polyamine, having at least three nitrogen atoms, thereby producing a succinimide or succinamide or mixtures thereof;   (B) reacting the product of step (A) with a phthalic anhydride or naphthalic anhydride post-treating agent or mixtures thereof, thereby producing an initial post-treated succinimide or succinamide or mixtures thereof; and   (C) reacting the product of step (B) with a cyclic carbonate thereby producing a final post-treated succinimide or succinamide or mixtures thereof, wherein at least one basic nitrogen remains in the final post-treated succinimide or succinamide or mixtures thereof.   
   
   
       9 . The lubricating oil composition of  claim 8  wherein the polyalkenyl succinic acid or the polyalkenyl succinic anhydride is derived from a polyisobutene having a number average molecular weight (M n ) of from about 500 to about 5000. 
   
   
       10 . The lubricating oil composition of  claim 8  wherein the polyalkylene polyamine is selected from diethylenetriamine, triethylenetetraamine, tetraethylenepentamine, pentaethylenehexamine, heavy polyamine, or mixtures thereof. 
   
   
       11 . The lubricating oil composition of  claim 10  wherein the polyalkylene polyamine is heavy polyamine. 
   
   
       12 . The lubricating oil composition of  claim 10  wherein the polyalkylene polyamine is tetraethylenepentamine. 
   
   
       13 . A method of making a lubricating oil additive composition which comprises the steps of:
 (A) reacting a polyalkenyl succinic acid or a polyalkenyl succinic anhydride with at least one polyalkylene polyamine, having at least three nitrogen atoms, thereby producing a succinimide or succinamide or mixtures thereof;   (B) reacting the product of step (A) with a phthalic anhydride or naphthalic anhydride post-treating agent or mixtures thereof, thereby producing an initial post-treated succinimide or succinamide or mixtures thereof; and   (C) reacting the product of step (B) with a cyclic carbonate thereby producing a final post-treated succinimide or succinamide or mixtures thereof, wherein at least one basic nitrogen remains in the final post-treated succinimide or succinamide or mixtures thereof.   
   
   
       14 . The method of making a lubricating oil additive composition of  claim 13  wherein the polyalkenyl succinic acid or the polyalkenyl succinic anhydride is derived from a polyisobutene having a number average molecular weight (M n ) of from about 500 to about 5000. 
   
   
       15 . A method of improving soot dispersancy in an internal combustion engine which comprises operating the engine with the lubricating oil composition of  claim 8 . 
   
   
       16 . A concentrate comprising from 10 to 90 wt % of the lubricating oil additive composition of  claim 1  and from 90 to 10 wt % of an organic diluent.