| 摘要 |
<p>Polyalkyl hydroxy and amino aromatic carbamates having the formula: <IMAGE> (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.</p> |
