Lubricant composition suitable for engines fueled by alternate fuels

Abstract

A lubricant composition suitable for use in engines fueled by gasoline or biorenewable fuels or both, comprising an oil of lubricating viscosity and a dispersant system is disclosed herein. Also disclosed is an emulsion composition comprising a biorenewable fuel, an oil of lubricant viscosity, and a dispersant system. A method of reducing aqueous separation in an emulsion composition is also disclosed.

1 . A lubricant composition suitable for use in engines fueled by gasoline or biorenewable fuels or both, comprising:
 (a) an oil of lubricating viscosity, and   (b) a dispersant system comprising at least one dispersant selected from the group consisting of hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, and Mannich base adducts derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine.   wherein the lubricant composition forms a stable emulsion as compared to a lubricant composition devoid of the dispersant.   
   
   
       2 . The composition of  claim 1 , wherein the hydrocarbyl substituent comprises a polyisobutylene group having a number average molecular weight of about 800 to about 2500. 
   
   
       3 . The composition of  claim 1 , wherein the dispersant system comprises a hydrocarbyl-substituted succinimide, wherein the ratio of hydrocarbyl substituent to succinic acid ranges from about 1.0:1.0 to about 1:0:1.6. 
   
   
       4 . The composition of  claim 1 , wherein the dispersant system comprises:
 (i) a first dispersant comprising at least one hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine, or Mannich base adduct derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine; and   (ii) a second dispersant comprising at least one hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine, or Mannich base adduct derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine,   wherein at least one of the first and second dispersants comprises a hydrocarbyl-substituted succinic acid derivative comprising a hydrocarbyl substituent having a number average molecular weight of about 800 to about 2500.   
   
   
       5 . The composition of  claim 4 , wherein at least one of the first and second dispersants comprises a hydrocarbyl-substituted succinimide, wherein the ratio of hydrocarbyl substituent to succinic acid ranges from about 1.0:1.0 to about 1:0:1.6. 
   
   
       6 . The composition of  claim 4 , wherein at least one of the first and second dispersants is a post treated dispersant. 
   
   
       7 . The composition of  claim 6 , wherein the ratio of (i):(ii) ranges from about 1:3 to about 3:1. 
   
   
       8 . The composition of  claim 6 , wherein the ratio of (i):(ii) ranges from about 1:1 to about 1:3. 
   
   
       9 . The composition of  claim 1 , further comprising at least one additive selected from the group consisting of antiwear agents, detergent, diluents, defoamers, demulsifiers, anti-foam agents, corrosion inhibitors, extreme pressure agents, seal well agents, antioxidants, pour point depressants, rust inhibitors and friction modifiers. 
   
   
       10 . An emulsion composition comprising:
 (a) a biorenewable fuel;   (b) an oil of lubricant viscosity; and   (c) a dispersant system comprising at least one dispersant selected from the group consisting of hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, or Mannich base adducts derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine.   
   
   
       11 . The composition of  claim 10 , wherein the hydrocarbyl substituent comprises a polyisobutylene group having a number average molecular weight of about 800 to about 2500. 
   
   
       12 . The composition of  claim 10 , wherein the dispersant system comprises a hydrocarbyl-substituted succinimide, wherein the ratio of hydrocarbyl substituent to succinic acid ranges from about 1.0:1.0 to about 1:0:1.6. 
   
   
       13 . The composition of  claim 10 , wherein the dispersant is a post treated dispersant. 
   
   
       14 . The composition of  claim 10 , wherein the dispersant system comprises:
 (i) a first dispersant comprising at least one hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine, or Mannich base adduct derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine; and   (ii) a second dispersant comprising at least one hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine, or Mannich base adduct derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine,   wherein at least one of the first and second dispersants comprises a hydrocarbyl-substituted succinic acid derivative comprising a hydrocarbyl substituent having a number average molecular weight of about 800 to about 2500.   
   
   
       15 . The composition of  claim 14 , wherein the ratio of (i):(ii) ranges from about 1:3 to about 3:1. 
   
   
       16 . The composition of  claim 14 , wherein the ratio of (i):(ii) ranges from about 1:1 to about 1:3. 
   
   
       17 . The composition of  claim 14 , wherein at least one of the first and second dispersants is a post treated dispersant. 
   
   
       18 . The composition of  claim 14 , further comprising at least one additive selected from the group consisting of antiwear agents, detergent, diluents, defoamers, demulsifiers, anti-foam agents, corrosion inhibitors, extreme pressure agents, seal well agents, antioxidants, pour point depressants, rust inhibitors and friction modifiers. 
   
   
       19 . A method of reducing aqueous separation in an emulsion composition comprising:
 providing an emulsion composition comprising a biorenewable fuel and an oil of lubricating viscosity; and   providing to said emulsion composition a dispersant system comprising at least one dispersant selected from the group consisting of hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, or Mannich base adducts derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine.   
   
   
       20 . The method of  claim 19 , wherein the dispersant system comprises:
 (i) a first dispersant comprising at least one hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine, or Mannich base adduct derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine; and   (ii) a second dispersant comprising at least one hydrocarbyl-substituted succinimide, hydrocarbyl-substituted amine, or Mannich base adduct derived from a hydrocarbyl-substituted phenol condensed with an aldehyde and an amine,   wherein at least one of the first and second dispersants comprises a hydrocarbyl-substituted succinic acid derivative comprising a hydrocarbyl substituent having a number average molecular weight of about 800 to about 2500.   
   
   
       21 . The method of  claim 20 , wherein the ratio of (i):(ii) ranges from about 1:3 to about 3:1. 
   
   
       22 . The method of  claim 20 , wherein the ratio of (i):(ii) ranges from about 1:1 to about 1:3. 
   
   
       23 . An engine, transmission or gear set lubricated with a lubricant composition according to  claim 1 . 
   
   
       24 . A method for lubricating a machine comprising providing to the machine the lubricant composition of  claim 1 . 
   
   
       25 . The method of  claim 24 , wherein the machine is a gear.