| abstract |
quaternary ammonium salts of the formula: wherein each of r1 and r2 is independently selected from an optionally substituted alkyl, alkenyl or aryl group having less than 8 carbon atoms, with r together with n forming an aliphatic heterocycle or aromatic which has less than 12 carbon atoms and R5 is hydrogen or an optionally substituted hydrocarbyl group. the use of these compounds as fuel or lubricating additives, especially as diesel fuel additives. |