Fuel compositions

A fuel composition comprising a mixture of a major amount of hydrocarbons in the gasoline boiling range and an additive compound in an amount from about 50 ppm by weight to about 400 ppm by weight based on the total weight of the fuel composition having the general formula:

• ##STR31## wherein x is 3;
• y is from 18 to 24;
• R.sub.1 and R.sub.2 are hydrogen;
• R.sub.3 is alkylene of 2 carbon atoms;
• R.sub.4 is hydrocarbyl of the formula:
• ##STR32## wherein R.sub.8 is hydrogen and R.sub.6 is alkyl of 2 carbon atoms;
• R.sub.5 is hydrogen and the weight average molecular weight of the additive compound is from about 1000 to about 2000.

A fuel composition comprising a mixture of a major amount of hydrocarbons in the gasoline boiling range and an additive compound in an amount from about 50 ppm by weight to about 400 ppm by weight based on the total weight of the fuel composition having the general formula:

• ##STR33## wherein x is 5;
• y is from 18 to 24;
• R.sub.1 and R.sub.2 are hydrogen;
• R.sub.3 is alkylene of 4 carbon atoms;
• R.sub.4 is hydrocarbyl of the formula:
• ##STR34## wherein R.sub.8 is hydrogen and R.sub.6 is alkyl of 2 carbon atoms;
• R.sub.5 is hydrogen and the weight average molecular weight of the additive compound is from about 1000 to about 2000.

A fuel composition comprising a mixture of a major amount of hydrocarbons in the gasoline boiling range and an additive compound in an amount from about 50 ppm by weight to about 400 ppm by weight based on the total weight of the fuel composition having the general formula:

• ##STR35## wherein x is 3;
• y is from 8 to 40;
• R.sub.1 and R.sub.2 are hydrogen;
• R.sub.3 is alkylene of 2 carbon atoms;
• R.sub.4 independently has the formula:
• ##STR36## wherein R.sub.8 and R.sub.6 are independently selected from the group consisting of hydrogen, alkyl of 1 to 18 carbon atoms, alkoxy-substituted alkylene of 1 to 18 carbon atoms and aryloxy-substituted alkylene of 1 to 18 carbon atoms;
• R.sub.5 is hydrogen and the weight average molecular weight of the additive compound is from about 1000 to about 2000.

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 having the formula:

• ##STR37## wherein x is from 3 to 11;
• y is from 1 to 50;
• R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, hydrocarbyl of 1 to 100 carbon atoms and substituted hydrocarbyl of 1 to 100 carbon atoms;
• R.sub.3 is selected from the group consisting of hydrocarbyl of 1 to 100 carbon atoms and substituted hydrocarbyl of 1 to 100 carbon atoms;
• R.sub.4 is 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.5 is selected from the group consisting of hydrogen, hydrocarbyl of 1 to 100 carbon atoms, substituted hydrocarbyl of 1 to 100 carbon atoms and acyl of 1 to 20 carbon atoms;
• ant eh weight average molecular weight of the additive compound 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 having the formula:

• ##STR40## wherein x is from 3 to 11;
• y is from 1 to 50;
• R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, hydrocarbyl of 1 to 100 carbon atoms and substituted hydrocarbyl of 1 to 100 carbon atoms;
• R.sub.3 is selected from the group consisting of hydrocarbyl of 1 to 100 carbon atoms and substituted hydrocarbyl of 1 to 100 carbon atoms;
• R.sub.4 is 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.5 is selected from the group consisting of hydrogen, hydrocarbyl of 1 to 100 carbon atoms, substituted hydrocarbyl of 1 to 100 carbon atoms and acyl of 1 to 20 carbon atoms and the weight average molecular weight of the additive compound is at least about 600.

A method for reducing 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 having the formula:

• ##STR43## wherein x is from 3 to 11;
• y is from 1 to 50;
• R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, hydrocarbyl of 1 to 100 carbon atoms and substituted hydrocarbyl of 1 to 100 carbon atoms;
• R.sub.3 is selected from the group consisting of hydrocarbyl of 1 to 100 carbon atoms and substituted hydrocarbyl of 1 to 100 carbon atoms;
• R.sub.4 is 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.5 is selected from the group consisting of hydrogen, hydrocarbyl of 1 to 100 carbon atoms, substituted hydrocarbyl of 1 to 100 carbon atoms and acyl of 1 to 20 carbon atoms and the weight average molecular weight of the additive compound is at least about 600.

The method of claim 68 wherein x is 3;

• R.sub.3 is hydrocarbyl of two carbon atoms;
• R.sub.6 is independently hydrogen or hydrocarbyl comprising alkyl of 1 to 2 carbon atoms;
• R.sub.8 is hydrogen;
• and R.sub.5 is hydrogen.

A compound having the formula:

• ##STR46## wherein x is 3;
• y is from 18 to 24;
• R.sub.1 and R.sub.2 are hydrogen;
• R.sub.3 is alkylene of 2 carbon atoms;
• R.sub.4 is hydrocarbyl of the formula:
• ##STR47## wherein R.sub.8 is hydrogen and R.sub.6 is alkyl of 2 carbon atoms;
• and R.sub.5 is hydrogen.

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:
• ##STR48## wherein x is from 3 to 11;
• y is from 1 to 50;
• R.sub.1 and R.sub.2 are independently selected from the group consisting of hydrogen, hydrocarbyl of 1 to 100 carbon atoms and substituted hydrocarbyl of 1 to 100 carbon atoms;
• R.sub.3 is selected from the group consisting of hydrocarbyl of 1 to 100 carbon atoms and substituted hydrocarbyl of 1 to 100 carbon atoms;
• R.sub.4 is 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.5 is selected from the group consisting of hydrogen, hydrocarbyl of 1 to 100 carbon atoms, substituted hydrocarbyl of 1 to 100 carbon atoms and acyl of 1 to 20 carbon atoms and the weight average molecular weight of the compound is at least about 600;
• and
• (c) a minor amount of an additional detergent selected from the group consisting of polyalkenyl amines, mannich amines, polyalkenyl succinimides, poly(oxyalkylene) carbamates, poly(alkenyl)-N-substituted carbamates and mixture thereof.