Mannich detergents for hydrocarbon fuels
AssigneeAfton Chemical Corporation
InventorsPeter W. Hou, Dennis J. Malfer, May Duffield Thomas, William J. Colucci
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Abstract
New, highly effective Mannich detergents for use in hydrocarbon fuels are described which reduce engine deposits in spark and compression ignition internal combustion engines. They are Mannich condensation reaction products obtained from reacting: (i) a polyamine having a sterically-hindered primary amino group, (ii) a hydrocarbyl-substituted hydroxyaromatic compound, and (iii) an aldehyde. These Mannich detergent compounds may be dispersed in a liquid carrier to provide a fuel additive concentrate for hydrocarbon engine fuels which effectively control engine deposit formation in intake valves and also other engine regions such as port fuel injectors and combustion chambers.
Claims17
Fuel additive composition, comprising
- (a) a Mannich reaction product obtained by reacting (i) a polyamine having at least two amino groups where at least one of the amino groups is a primary amino group physically-sterically-protected to hinder its ability to participate in the Mannich reaction via a sterically hindering hydrocarbyl group bonded to the same carbon atom from which the at least one amino group is bonded, (ii) a hydrocarbyl-substituted hydroxyaromatic compound, and (iii) an aldehyde;
- (b) a liquid carrier;
- and
- wherein the polyamine has a structure selected from one of
- wherein R1 and R2 are selected from hydrocarbyl groups.
A Mannich detergent comprising the reaction product of 1) a polyamine 2) polyisobutylene-substituted cresol and/or phenol wherein the polyisobutylene has an average molecular weight of about 300 to about 2,000, and 3) formaldehyde;
- and wherein the polyamine has a structure selected from one of
- wherein R1 and R2 are selected from hydrocarbyl groups.
A fuel composition for an internal combustion engine, comprising
- (a) in major amount, a spark-ignitable combustible hydrocarbon fuel;
- and
- (b) in minor amount, a fuel additive composition comprising a Mannich reaction product obtained by reacting (i) a polyamine having at least two amino groups where at least one amino group is a primary amino group physically-sterically-protected to hinder its ability to participate in the Mannich reaction, (ii) a hydrocarbyl-substituted hydroxyaromatic compound, and (iii) an aldehyde, wherein the Mannich reaction product is present in an amount sufficient to reduce the weight amount of engine deposits in an internal combustion engine operated on the fuel composition;
- and wherein the polyamine has a structure selected from one of
- wherein R1 and R2 are selected from hydrocarbyl groups.
Dependencies are inferred from the claim text.