Mannich condensation products of poly(oxyalkylene) hydroxyaromatic esters and fuel compositions containing the same
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United States of America Patent
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Jan 9, 1996
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N/A
app pub date -
Dec 30, 1993
filing date -
Dec 30, 1993
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Expired
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Abstract
Mannich condensation products prepared by the condensation of a compound of the formula: ##STR1## wherein R.sub.1 is hydrogen, hydroxy, lower alkyl or lower alkoxy; R.sub.3 and R.sub.4 are independently hydrogen or lower alkyl; R.sub.5 is hydrogen, alkyl, phenyl, aralkyl, alkaryl, or an acyl group of the formula: ##STR2## wherein R.sub.6 is alkyl, phenyl, aralkyl or alkaryl; R.sub.7 is hydrogen, hydroxy, lower alkyl or lower alkoxy; n is an integer from 5 to 100; and x and y are each independently an integer from 0 to 10; with an aldehyde and a nitrogen base selected from ammonia, lower alkylamine, a polyamine and mixtures thereof. 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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