Polymer composition for lubricant additives

Abstract

A lubricating oil composition containing in combination an acylating agent substituted with a polymer of an alkene with 6 to 40 carbon atoms and an acylating agent substituted with polyisobutylene provides improved viscometric properties for dispersants used in internal combustion engines.

What is claimed is:  
     
         1 . A composition comprising: 
 (a) an acylating agent containing a substituent of a polymer of an alkene having about 6 to about 40 carbon atoms; and    (b) an acylating agent containing a polyisobutylene substituent;    provided that the weight percent ratio of the alkene polymer substituent to the polyisobutylene substituent in the composition is about 25:75 to about 75:25.    
     
     
         2 . The composition of  claim 1  wherein the alkene comprisies a mixtures of alpha-olefins.  
     
     
         3 . The composition of  claim 1  wherein the alkene contains about 6 to about 18 carbon atoms.  
     
     
         4 . The composition of  claim 1  wherein the alkene contains about 6 to  11  carbon atoms.  
     
     
         5 . The composition of  claim 1 , wherein the acylating agents are prepared by the reaction of a carboxylic acid or reactive equivalents thereof, with an alkene polymer of about 6 to about 40 carbon atoms and with a polyisobutylene.  
     
     
         6 . The composition of  claim 5  wherein the alkene polymer and the polyisobutylene are mixed together and reacted with the carboxylic acid reactant.  
     
     
         7 . The composition of  claim 6  wherein the alkene polymer and the polyisobutylene are separately reacted with the carboxylic acid reactant, and the resulting products are mixed together.  
     
     
         8 . The composition of  claim 5  wherein the alkene polymer contains a vinylidene double bond.  
     
     
         9 . The composition of  claim 5  wherein at least about 30% of the polyisobutylene molecules contain a vinylidene double bond.  
     
     
         10 . The composition of  claim 5  wherein the carboxylic acid reactant is selected from the group consisting of maleic acid, maleic anhydride, acrylic acid, methacrylic acid, itaconic acid, fumaric acid, glyoxylic acid or an ester thereof, and mixtures thereof.  
     
     
         11 . A composition comprising the reaction product of: 
 an acylating agent containing a substituent of a polymer of an alkene having about 6 to about 40 carbon atoms; and    an acylating agent containing a polyisobutylene substituent; and    at least one compound selected from the group consisting of amines, alcohols, aminoalcohols and mixtures thereof,    provided that the weight percent ratio of the alkene polymer substituent to the polyisobutylene substituent in the composition is about 25:75 to about 75:25.    
     
     
         12 . The composition of  claim 11  wherein the amine is a polyamine.  
     
     
         13 . The composition of  claim 1  further comprising an oil of lubricating viscosity.  
     
     
         14 . The composition of  claim 11  further comprising an oil of lubricating viscosity.  
     
     
         15 . The composition of  claim 1  wherein the oil of lubricating viscosity is selected from API Group II, Group III, Group IV, and Group V oils and mixtures thereof.  
     
     
         16 . The composition of  claim 11  wherein the oil of lubricating viscosity is selected from API Group II, Group III, Group IV, and Group V oils and mixtures thereof.  
     
     
         17 . The composition of  claim 1 , further comprising at least one additive selected from the group consisting of antioxidants, metal deactivators, detergents, dispersants, antiwear agents, antiscuffing agents, extreme pressure agents, foam inhibitors, demulsifiers, viscosity modifiers, pour point depressants, and mixtures thereof.  
     
     
         18 . The composition of  claim 11 , further comprising at least one additive selected from the group consisting of antioxidants, metal deactivators, detergents, dispersants, antiwear agents, antiscuffing agents, extreme pressure agents, foam inhibitors, demulsifiers, viscosity modifiers, pour point depressants, and mixtures thereof.  
     
     
         19 . A composition comprising: 
 (a) an acylating agent containing a substituent of a polymer of an alkene having 6 to 11 carbons atoms; and    (b) an acylating agent containing a polyisobutylene substituent;    provided that the weight percent ratio of the alkene polymer substituent to the polyisobutylene substituent in the composition is about 5:95 to about 95:5.    
     
     
         20 . The composition of  claim 19  wherein the alkene polymer with 6 to 11 carbons atoms is polydecene.  
     
     
         21 . A composition comprising the reaction product of the composition of  claim 19  with an amine, an alcohol, an aminoalcohol, or mixtures thereof.  
     
     
         22 . The composition of  claim 19 , further comprising at least one additive selected from the group consisting of antioxidants, metal deactivators, detergents, dispersants, antiwear agents, antiscuffing agents, extreme pressure agents, foam inhibitors, demulsifiers, viscosity modifiers, pour point depressants and mixtures thereof.  
     
     
         23 . The composition of  claim 21 , further comprising at least one additive selected from the group consisting of antioxidants, metal deactivators, detergents, dispersants, antiwear agents, antiscuffing agents, extreme pressure agents, foam inhibitors, demulsifiers, viscosity modifiers, pour point depressants and mixtures thereof.  
     
     
         24 . A method for lubricating an internal combustion engine, comprising supplying thereto the lubricating oil composition of  claim 14 .  
     
     
         25 . A method for preparing an acylating agent composition, comprising reacting 
 a carboxylic acid reactant with    a mixture of an alkene polymer of 6 to about 40 carbon atoms and a polyisobutylene, wherein the weight ratios of the alkene polymer and the polyisobutylene employed are about 25:75 to about 75:25.    
     
     
         26 . A method for preparing an acylating agent composition, comprising reacting 
 a carboxylic acid reactant with an alkene polymer of 6 to about 40 carbon atoms, and separately reacting    a carboxylic acid reactant with a polyisobutylene,    and subsequently combining the reaction products; wherein the weight ratios of the alkene polymer and the polyisobutylene employed are about 25:75 to about 75:25.    
     
     
         27 . A method for preparing a dispersant composition, comprising further reacting the acylating agent composition prepared by the method of  claim 25  with an amine, an alcohol, an aminoalcohol, or mixtures thereof.  
     
     
         28 . A method for preparing a dispersant composition, comprising further reacting the acylating agent composition prepared by the method of  claim 26  with an amine, an alcohol, an aminoalcohol, or mixtures thereof.  
     
     
         29 . A method for preparing a dispersant composition, comprising mixing together: 
 (a) the reaction product of an acylating agent containing a substituent of a polymer of an alkene having about 6 to about 40 carbon atoms with an amine, alcohol, aminoalcohol, or mixtures thereof; and    (b) the reaction product of an acylating agent containing a polyisobutylene substituent with an amine, alcohol, aminoalcohol, or mixtures thereof;    provided that the weight percent ratio of the alkene polymer substituent to the polyisobutylene substituent in the composition is about 25:75 to about 75:25.