Patent ID: 11970668
Assignee: EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 15:
16. A method for improving intake valve and injector cleanliness of an engine for a vehicle utilizing a liquid fuel composition comprising the following:
providing to the vehicle a liquid fuel composition comprising a liquid fuel including an effective amount of a heat activated detergent additive of the following formula., wherein X is hydrogen or a masking group (MG) with at least one X being MG,
wherein MG is selected from the group consisting of fluorenylmethoxy carbonyl, phenyl carbamate, t-butyl carbamate, benzyl-carbamate, 2,2,6,6-tetramethylpiperidin-1-yloxycarbonyl, and combinations thereof,
wherein CG is a connecting group selected from the group consisting of a dialkyl group, a carbamate group, an aromatic group, a phenolic group, and a polyethylamine group, and
wherein m is an integer ranging from 5 to 30,
injecting the liquid fuel composition into the engine and combusting the liquid fuel composition, and
measuring the amount of deposits on the engine valves and the engine injectors,
wherein the amount of deposit build-up on the engine intake valves (intake valve deposits) are decreased by 10% to 100% compared to a comparable liquid fuel not including the heat activated detergent additive.