Fuel compositions containing deposit control additives
AssigneeChevron Research Company
InventorsRobert A. Lewis, Lewis R. Honnen
Life of this patent
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Abstract
Fuel compositions for internal combustion engines are provided which contain deposit control additives which maintain cleanliness of intake systems without contributing to combustion chamber deposits. The additives are polyloxyalkylene carbamates comprising a hydroxy- or hydrocarbyloxy-terminated polyloxyalkylene chain of 2-5 carbon oxyalkylene units bonded through an oxycarbonyl group to a nitrogen atom of a polyamine having from 2 to 10 amine nitrogens and from 2 to 40 carbons with a carbon:nitrogen ratio between about 1:1 and 10:1.
Claims22
A fuel composition comprising a major portion of hydrocarbons boiling in the gasoline range and from 30 to 2000 ppm of a poly(oxyalkylene) carbamate having at least one C.sub.1 -C.sub.30 hydrocarbyloxy-terminated poly(oxyalkylene) chain of 2 to 5 carbon oxyalkylene units bonded through an oxycarbonyl group to a nitrogen atom of a polyamine;
- said polyamine having from 2 to 10 amine nitrogens and from 2 to 40 carbon atoms, said carbamate having a molecular weight of from about 500 to 10,000.
A fuel composition comprising a major portion of hydrocarbons boiling in the gasoline range and from 30 to 2000 ppm of a compound of the formula ##STR6## wherein R is the same or different constituent selected from (I) hydrogen,
- (II) hydrocarbyl of 1 to 10 carbon atoms,
- (III) hydrocarbonyl of 2 to 10 carbon atoms, and
- (IV) a group of the formula ##STR7## in which g, g' and g" are integers 1 to 2;
- h, h' and h" are 0 or 1;
- i, i' and i" are integers 1 to 3;
- the sum of g and h is 2;
- M is methyl or ethyl;
- j, j' and j" are integers and the sum of j, j' and j" is such that the molecular weight of (IV) is 500 to 5,000;
- Z is hydrocarbyl of 1 to 30 carbon atoms;
- R.sub.1 is the same or different alkylene or hydroxy-substituted alkylene radical of 2 to 6 carbon atoms;
- R.sub.2 is carbonyl, alkyl carbonyl or alkylene of 2 to 4 carbon atoms with vicinal linkages, at least one and preferably not more than two of the R groups are (IV) and sufficient of the oxyalkylene units in IV are other than ethyleneoxy to render the compounds soluble in hydrocarbon fuel boiling in the gasoline range;
- a' is 0 or 1, b' is an integer 0 to 4, c' is 0 or 1, d' is 0 or 1, e' is 0 or 1 and f' is 0 or 1 and equal to 1 when c' is 0.
Dependencies are inferred from the claim text.