| abstract |
A fuel additive having the formula: <IMAGE> wherein A1 is a thioether, a sulfoxide, a sulfone, a sulfonic acid, a sulfonamide, a nitrile, a carboxylic acid or ester, or a carboxamide; R1 and R2 are independently hydrogen, hydroxy, lower alkyl or lower alkoxy; R3 and R4 are independently hydrogen or lower alkyl; n is an integer from 0 to 100; and when n is 0 to 10, R5 is polyalkyl having an average molecular weight of 450 to 5,000; and when n is 5 to 100, R5 is hydrogen, alkyl, phenyl, aralkyl, alkaryl or an acyl group having the formula: <IMAGE> wherein R6 is alkyl, phenyl, aralkyl or alkaryl; R7 and R8 are independently hydrogen, hydroxy, lower alkyl or lower alkoxy; A2 is a thioether, a sulfoxide, a sulfone, a sulfonic acid, a sulfonamide, a nitrile, a carboxylic acid or ester, or a carboxamide; and x and y are independently integers from 0 to 10; with the proviso that when n and x are both 0, then A1 may not be a carboxylic acid or ester, or a carboxamide. |