Hydrocarbyl dispersants including pendant polar functional groups

A lubricant additive comprising a reaction product of (1) an acrylamide comprised of a compound of the formula:

• where R1 is selected from an α,β-unsaturated linear or branched alkylene group, and R2 and R3 are independently selected from H, a linear or branched alkyl or alkenyl group, an aryl group, a cycloalkyl group, an aralkyl group, an alkyaryl group, an alkyl amine group, and an aryl amine group, provided that at least one of R2 and R3 contain a titratable nitrogen;
• and
• (2) a dispersant having at least one primary or secondary amine group and being selected from the group consisting of hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, and Mannich base adducts derived from hydrocarbyl-substituted phenols condensed with aldehydes and amines, wherein the hydrocarbyl-substituent has a number average molecular weight ranging from about 500 to about 5000 as determined by gel permeation chromatography.

A method of lubricating moving parts of a vehicle containing one or more moving parts, the method comprising contacting a lubricating oil with the one or more moving parts of the vehicle, said oil comprising a lubricant composition containing a lubricant and a lubricant additive, the lubricant additive including a reaction product of (1) an acrylamide comprised of a compound of the formula:

• where R1 is selected from an α,β-unsaturated linear or branched alkylene group, and R2 and R3 are independently selected from H, a linear or branched alkyl or alkenyl group, an aryl group, a cycloalkyl group, an aralkyl group, an alkyaryl group, an alkyl amine group, and an aryl amine group, provided that at least one of R2 and R3 contain a titratable nitrogen;
• and
• (2) a dispersant having at least one primary or secondary amine group and being selected from the group consisting of hydrocarbyl-substituted succinimides, hydrocarbyl-substituted amines, and Mannich base adducts derived from hydrocarbyl-substituted phenols condensed with aldehydes and amines, wherein the hydrocarbyl substituent has a number average molecular weight ranging from about 500 to about 5000 as determined by gel permeation chromatography, and wherein the lubricant additive is present in the lubricant composition in an amount sufficient to lubricate the one or more moving parts of the vehicle.

A composition for use as a dispersant comprising a compound of the formula:

• where B is selected from a hydrocarbyl-substituted succinic acid group, a reaction product of an alkyl phenol and an aldehyde, and a polyalkylene group, D is selected from an amine and a polyamine, and E is a group derived from a compound of the formula:
• where R1 is selected form an α,β-unsaturated linear or branched alkylene group, and R2 and R3 are independently selected from H, a linear or branched alkyl or alkenyl group, an aryl group, a cycloalkyl group, an aralkyl group, an alkyaryl group, an alkyl amine group, and an aryl amine group, provided that at least one of R2 and R3 contain a titratable nitrogen.