| 摘要 |
Mannich condensation products prepared by the condensation of a compound having the formula: <IMAGE> (A) wherein R is hydrogen, lower alkyl having 1 through 6 carbon atoms, hydroxy or lower alkoxy having 1 through 6 atoms; R1 is polyalkyl having an average molecular weight of about from 400 to 5000 and n is 0 or a whole integer of from 1 through 10 with ammonia, alkylamine, or polyamine and an aldehyde. The condensation products and their fuel-soluble salts are useful as fuel additives for the prevention and control of engine deposits.
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