Fuel compositions

A method for decreasing intake valve deposits in an internal combustion engine which comprises burning in said engine a fuel composition comprising a major amount of hydrocarbons in the gasoline boiling range and a minor amount of an additive compound of the formula:

• ##STR27## wherein R.sub.1 and R.sub.2 are each independently selected from the group consisting of hydrocarbyl of 2 to 100 carbon atoms and substituted hydrocarbyl of 2 to 100 carbon atoms;
• R.sub.3 and R.sub.4 are each independently selected from the group consisting of hydrocarbyl of 1 to 100 carbon atoms, substituted hydrocarbyl of 1 to 100 carbon atoms and polyoxyalkylene alcohol of 2 to 200 carbon atoms;
• R.sub.5 is selected from the group consisting of alkylene of 2 to 10 carbon atoms and alkylene of 2 to 20 carbon atoms having at least one of the methylene groups replaced by at least one oxygen atom or at least one acylated nitrogen atom;
• x is from 1 to 50;
• y is from 1 to 50 and the weight average molecular weight is at least about 600.

A method for controlling the octane requirement increase in an internal combustion engine which comprises burning in said engine a fuel composition comprising a major amount of hydrocarbons in the gasoline boiling range and a minor amount of an additive compound of the formula:

• ##STR31## wherein R.sub.1 and R.sub.2 are each independently selected from the group consisting of hydrocarbyl of 2 to 100 carbon atoms and substituted hydrocarbyl of 2 to 100 carbon atoms;
• R.sub.3 and R.sub.4 are each independently selected from the group consisting of hydrocarbyl of 1 to 100 carbon atoms, substituted hydrocarbyl of 1 to 100 carbon atoms and polyoxyalkylene alcohol of 2 to 200 carbon atoms;
• R.sub.5 is selected from the group consisting of alkylene of 2 to 20 carbon atoms having at least one of the methylene groups replaced with at least one oxygen atom or at least one acylated nitrogen atom;
• x is from 1 to 50;
• and y is from 1 to 50;
• and the weight average molecular weight is at least about 600.

A method for reducing octane requirement in an internal combustion engine which comprises burning in said engine a fuel composition comprising a major amount of hydrocarbons in the gasoline boiling range and a minor amount of an additive compound of the formula:

• ##STR32## wherein R.sub.1 and R.sub.2 are each independently selected from the group consisting of hydrocarbyl of 2 to 100 carbon atoms and substituted hydrocarbyl of 2 to 100 carbon atoms;
• R.sub.3 and R.sub.4 are each independently selected from the group consisting of hydrocarbyl of 1 to 100 carbon atoms, substituted hydrocarbyl of 1 to 100 carbon atoms and polyoxyalkylene alcohol of 2 to 200 carbon atoms;
• R.sub.5 is selected from the group consisting of alkylene of 2 to 10 carbon atoms and alkylene of 2 to 20 carbon atoms having at least one of the methylene groups replaced with at least one oxygen atom or at least one acylated nitrogen atom;
• x is from 1 to 50;
• y is from 1 to 50;
• and the weight average molecular weight is at least about 600.

A fuel composition comprising a mixture of:

• (a) a major amount of hydrocarbons in the gasoline boiling range;
• (b) a minor amount of an additive compound having the general formula:
• ##STR33## wherein R.sub.1 and R.sub.2 are each independently selected from the group consisting of hydrocarbyl of 2 to 100 carbon atoms and substituted hydrocarbyl of 2 to 100 carbon atoms;
• R.sub.3 and R.sub.4 are each independently selected from the group consisting of hydrocarbyl of 1 to 100 carbon atoms, substituted hydrocarbyl of 1 to 100 carbon atoms and polyoxyalkylene alcohol of 2 to 200 carbon atoms;
• R.sub.5 is selected from the group consisting of alkylene of 2 to 20 carbon atoms having at least one of the methylene groups replaced with at least one oxygen atom or at least one acylated nitrogen atom;
• x is from 1 to 50;
• and y is from 1 to 50;
• and the weight average molecular weight is at least about 600;
• and
• (c) a minor amount of a detergent selected from the group consisting of polyalkenyl amines, mannich amines, polyalkenyl succinamides, poly(oxyalkylene) carbamates, poly(alkenyl)-N-substituted carbamates and mixtures thereof.

A compound of the formula:

• ##STR34## wherein R.sub.1 and R.sub.2 are each of the formula:
• ##STR35## wherein R.sub.6 is selected from the group consisting of hydrogen and alkyl of 1 to 18 carbon atoms and R.sub.8 is selected from the group consisting of hydrogen and alkyl of 1 to 18 carbon atoms;
• R.sub.3 and R.sub.4 are each methyl and R.sub.5 is alkylene of 2 to 20 carbon atoms having at least one of the methylene groups replaced with at least one oxygen atom;
• x is from 1 to 26;
• and y is from 1 to 26.

A compound of the formula:

• ##STR36## wherein R.sub.1 and R.sub.2 are each of the formula:
• ##STR37## wherein R.sub.6 is selected from the group consisting of hydrogen and alkyl of 1 to 18 carbon atoms and R.sub.8 is selected from the group consisting of hydrogen and alkyl of 1 to 18 carbon atoms;
• R.sub.3 and R.sub.4 are each methyl and R.sub.5 is alkylene of 2 to 20 carbon atoms having at least one of the methylene groups replaced with at least one acylated nitrogen atom;
• x is from 1 to 26;
• and y is from 1 to 26.

A compound of the formula:

• ##STR38## wherein R.sub.1 and R.sub.2 are each of the formula:
• ##STR39## wherein R.sub.6 is selected from the group consisting of hydrogen and alkyl of 1 to 18 carbon atoms and R.sub.8 is selected from the group consisting of hydrogen and alkyl of 1 to 18 carbon atoms;
• R.sub.3 and R.sub.4 are each polyoxyalkylene alcohol of the formula:
• --(R.sub.9 --O).sub.z --H
• wherein R.sub.9 is of the formula:
• ##STR40## wherein R.sub.12 is hydrogen and R.sub.10 is alkyl of 2 carbon atoms;
• x, y and each z is from 9 to 26 and R.sub.5 is alkylene of 2 to 20 carbon atoms having at least one of the methylene groups replaced with at least one oxygen atom;
• x is from 1 to 26;
• and y is from 1 to 26.