| abstract |
Esters of polyalkyl or polyalkenyl N -hydroxyalkyl succinimides having the formula:n n or a fuel soluble salt thereof; wherein R is a polyalkyl or polyalkenyl group having an average molecular weight in thenrange of about 450 to about 5,000; n is an integer from 2 to 5; and Z is a moiety selected from the group consisting ofn nwherein R 1 is a hydroxy, nitro, cyano or -(CH 2 ) x -NR 3 R 4 , wherein R 3 and R 4 arenindependently hydrogen or lower alkyl of 1 to 6 carbon atoms and x is 0 or 1; and R 2 nis hydrogen, hydroxy, nitro, cyano or -(CH 2 ) y -NR 5 R 6 , wherein R 5 and R 6 arenindependently hydrogen or lower alkyl of 1 to 6 carbon atoms and y is 0 or 1. n The compounds of formula I are useful as fuel additives for the prevention andncontrol of engine deposits. |