| abstract |
Polyalkyl hydroxy and amino aromatic carbamates having formula (I) or a fuel-soluble salt thereof; wherein X is hydroxy or amino; R1 and R2 are independently hydrogen, hydroxy, lower alkyl having 1 to 6 carbon atoms, lower alkoxy having 1 to 6 carbon atoms, nitro, amino, N-alkylamino wherein the alkyl group contains 1 to 6 carbon atoms, or N,N-dialkylamino wherein each alkyl group independently contains 1 to 6 carbon atoms; R3 is hydrogen or lower alkyl having 1 to 6 carbon atoms; and R4 is a polyalkyl group having an average molecular weight in the range of about 400 to 5,000. The polyalkyl hydroxy and amino aromatic carbamates of formula (I) are useful as fuel additives for the prevention and control of engine deposits. |