Fuel compositions comprising a combination of monoether and ashless dispersants

Claim 2

A fuel composition according to Claim 1 containing from about 0.001 to about 5 percent by weight of said additive combination wherein the dispersant is at least one ester, amide, imide, amidines or amine salt of a polymerized olefin-substituted mono-or dicarboxylic acid or a chlorinated, polymerized olefin-substituted mono- or dicarboxylic acid containing at least about thirty aliphatic carbon atoms in the carboxylic acid moiety.

Claim 3

A fuel composition according to claim 3 where said at least one oxy compound corresponds to those represented by the formula: where n is such that the average molecular weight of the oxy compound is not greater than about 1,500, each R is independently selected from the class consisting of H and hydrocarbyl of up to about eight carbon atoms with the proviso that both R variables are not hydrocarbyl, and R'' is hydrocarbylene of up to about eight carbon atoms.

Claim 4

A gasoline fuel composition according to claim 4 where n is 0, 1, 2, or 3, each R is independently H, phenyl, alkyl phenyl, phenylalkyl, alkylphenylalkyl, or alkyl with the proviso that at least one R variable is H, and R'' is alkylene.

Claim 5

A gasoline fuel composition according to claim 5 wherein the dispersant is the reaction product of at least one of said substituted mono- or dicarboxylic acids or their anhydrides and at least one alkylene polyamine having up to about ten amino nitrogen atoms where the ratio of substituted mono- or dicarboxylic acid or anhydride and the alkylene polyamine in the reaction mixture iS from about one equivalent of acid or anhydride per equivalent of alkylene polyamine to about one equivalent of acid or anhydride per mole of alkylene polyamine.

Claim 6

A gasoline fuel composition according to claim 6 wherein n is O, one R is H, and the other R is alkyl.

Claim 7

A gasoline fuel composition according to claim 7 wherein the dispersant is the reaction product of at least one polysiobutenyl substituted-succinic acid or anhydride or a chlorinated polyisobutenyl substituted-succinic acid or anhydride and at least one ethylene polyamine having from two to six amino nitrogen atoms in the molecules thereof, wherein the polyisobutenyl-substituted succinic acid or anhydride and the ethylene polyamine are reacted in an equivalent ratio of about 1: 1 to about 1:3.

Claim 8

A gasoline fuel composition according to claim 8 wherein the oxy compound is ethylene glycol monobutyl ether.

Claim 9

A fuel composition according to claim 1 wherein the normally liquid fuel is a petroleum distillate fuel.

Claim 10

A fuel composition according to claim 10 wherein the normally liquid fuel is a petroleum distillate fuel boiling in the gasoline range.

Claim 11

A fuel composition according to claim 1 wherein said additive combination contains at least one substantially inert organic solvent for the said additive combination.

Claim 12

A fuel composition according to claim 12 wherein the solvent is an aromatic hydrocarbon.

Claim 13

A composition useful in the method for cleaning the fuel system of a liquid fuel burning internal combustion engine or liquid fuel burning heating device comprising contacting at least the internal surfaces of said fuel system with a cleaning composition, said composition comprising a solution of (1) at least one oxy compound which is a monoether of a glycol or polyglycol and (2) at least one fuel-soluble ashless dispersant selected from the class consisting of esters, amides, imides, amidines, and amine salts of at least one substantially saturated carboxylic acid characterized by the presence within its structure of at least about thirty aliphatic carbon atoms, the weight ratio of oxy compound to dispersant being about 0.1:1 to about 2.5:1 and (3) a solvent for the combination of (1) and (2) wherein (3) the solvent for the combination of (1) and (2) is at least one normally liquid, substantially inert, organic compound the total amount of the combination of (1) and (2) being from about 5 to about 70 percent by weight of the total weight of composition.

Claim 14

The composition according to claim 14 wherein the oxy compounds correspond to the formula where n is such that the average molecular weight of the oxy compounds is not greater than about 1,500, each R is independently selected from H and hydrocarbyl of up to about 12 carbon atoms with the proviso that both R variables are not hydrocarbyl, and R'' is hydrocarbylene of up to about eight carbon atoms; and wherein the dispersant is the reaction product of at least one acylating agent selected from the class consisting of polymerized olefin-substituted mono- or dicarboxylic acid or chlorinated polymerized olefin-substituted mono- or dicarboxylic acid, or the lower alkyl esters, acyl halides, or anhydrides, of those containing at least about 30 aliphatic carbon atoms in the carboxylic acid moiety with at least one alkylene polyamine having up to about ten amino nitrogen atoms wherein the ratio of acylating agent to alkylene polyamine in the reaction mixture is from about one equivalent of acylating agent per equivalent of alkylene polyamines to about one equivalent of acylating agent to about one mole of alkylene polyamine; and wherein the solvent is a normally liquid aromatic hydrocarbon.

Claim 15

A composition according to claim 15 wherein n is 0, 1, 2, or 3, each R is independently H or alkyl of up to about eight carbon atoms, with the provIso that both R variables are not alkyl and R'' is alkylene of up to about eight carbon atoms and wherein the dispersant is the reaction product obtained by reacting at least polyisobutenyl-substituted or chlorinated polyisobutenyl-substituted succinic acid or anhydride with an ethylene polyamine.

Claim 16

A composition according to claim 16 wherein the n is 0, one R is H, and the other is lower alkyl and the dispersant is the reaction product of at least one polyisobutenyl-substituted or chlorinated polyisobutenyl-substituted succinic acid or anhydride and an ethylene polyamine having from two to six amino nitrogen atoms in the molecules thereof wherein the succinic acid or anhydride and the ethylene polyamine are reacted in an equivalent ratio of about 1:1 to about 1:3, and wherein the solvent is at least one alkyl-substituted benzene containing up to 12 carbon atoms.

Claim 17

The composition according to claim 17 wherein oxy compound is ethylene glycol monobutyl ether.