Polyesters of poly(oxyalkylene) hydroxyaromatic ethers

A fuel composition comprising a major amount of hydrocarbons boiling in the gasoline or diesel range and an effective detergent amount of a compound of the formula:

• ##STR49## or a fuel-soluble salt thereof;
• wherein n is an integer from 5 to 100;
• x is an integer from 0 to 10;
• R.sub.1 and R.sub.2 are each independently hydrogen, hydroxy, lower alkyl having 1 to 6 carbon atoms, or lower alkoxy having 1 to 6 carbon atoms;
• R.sub.3 and R.sub.4 are each independently hydrogen or lower alkyl having 1 to 6 carbon atoms;
• and
• R.sub.5 is acyl group of the formula:
• ##STR50## wherein y is 1, 2 or 3;
• R.sub.6 is a divalent hydrocarbyl radical, when y is 1, a trivalent hydrocarbyl radical, when y is 2, or tetravalent hydrocarbyl group, when y is 3, said hydrocarbyl radicals having 1 to about 20 carbon atoms;
• and
• each Z is independently selected from the group consisting of:
• ##STR51## wherein each R.sub.7 is independently alkyl having 1 to 30 carbon atoms, phenyl, aralkyl having 7 to 36 carbon atoms or alkaryl having 7 to 36 carbon atoms.

A fuel concentrate comprising an inert stable oleophilic organic solvent boiling in the range of from about 150.degree. F. to 400.degree. F. and from about 10 to about 70 weight percent of a compound of the formula:

• ##STR58## or a fuel-soluble salt thereof;
• wherein n is an integer from 5 to 100;
• x is an integer from 0 to 10;
• R.sub.1 and R.sub.2 are each independently hydrogen, hydroxy, lower alkyl having 1 to 6 carbon atoms, or lower alkoxy having 1 to 6 carbon atoms;
• R.sub.3 and R.sub.4 are each independently hydrogen or lower alkyl having 1 to 6 carbon atoms;
• and
• R.sub.5 is acyl group of the formula:
• ##STR59## wherein y is 1, 2 or 3;
• R.sub.6 is a divalent hydrocarbyl radical, when y is 1, a trivalent hydrocarbyl radical, when y is 2, or tetravalent hydrocarbyl group, when y is 3, said hydrocarbyl radicals having 1 to about 20 carbon atoms;
• and
• each Z is independently selected from the group consisting of:
• ##STR60## wherein each R.sub.7 is independently alkyl having 1 to 30 carbon atoms, phenyl, aralkyl having 7 to 36 carbon atoms or alkaryl having 7 to 36 carbon atoms.