Method for the synthesis of surface-active anion-cation complexes

A method for the synthesis of surface active anion-cation complexes comprising the steps of reacting an organic or organosilicon compound having at least one epoxide group, wherein said organic compound is of the general formula ##STR10## Wherein R.sup.4 is a hydrogen or alkyl group with 2 to 6 carbon atronis and X is a number from 2 to 14, or the organic compound is an epoxide of an unsaturated fatty acid or its ester,

• with a quaternary ammonium hydrogen sulfide of the general formula
• HN.sup.+ (R.sup.1).sub.3 SO.sub.3 H I
• wherein
• R.sup.1 within a molecule is the same or different and can be
• (1) an alkyl or hydroxyalkyl group with 1 to 18 carbon atoms;
• (2) a phenyl group;
• or
• (3) a group of the formula C.sub.n H.sub.2n+1 COHN--(CH.sub.2).sub.m --, in which n can be a number from 7 to 17 and m is 2 or 3;
• in the presence of a polar solvent in such amount that the molar ratio of the epoxide group to HN.sup.+ (R.sup.1).sub.3 SO.sub.3 H is about 2:1.