ADDITIVES FOR MINIMIZING INTAKE VALVE DEPOSITS, AND THEIR USE

摘要

New, highly effective detergent/dispersants for use in spark ignition fuels are described. They are Mannich condensation products formed from (i) one mole part of at least one substituted hydroxyaromatic compound having on the ring both (a) an aliphati c hydrocarbyl substituent derived from a polyolefin having a number average molecu lar weight in the range of about 500 to about 3000, and (b) a C1-4 alkyl; (ii) from 0.8 to 1.5 mole part(s) of aliphatic polyamine having one and only one primary or secondary amino group in the molecule capable of participating in the Mannich condensation reaction; and (iii ) from 0.8 to 1.3 mole part(s) of aldehyde, provided that the mole ratio of aldehyde to amine is 1.2:1 or less. Carrier fluids such as poly(oxyalkylene) compounds further enhance the effective ness of these Mannich condensation products in minimizing or reducing intake valve deposits an d/or intake valve sticking.