Concentrated and self-preserving compositions of mild surfactants for transparent and skin-pH personal care formulations

A mild surfactant composition comprising;

• (i) aqueous blend of O-acyl isethionates of Formula I and monopotassium N-acyl glutamate of Formula II;
• wherein, R is selected from C5 to C21 alkyl group, saturated or unsaturated, R1 is selected from H or methyl, X is selected from Na+ or K+ and prepared by the process, comprising steps of
• A) reacting more than one equivalence of fatty acid chloride with alkali metal hydroxyalkyl sulphonates to prepare compounds of Formula I,
• B) reacting the reaction mass of step (A) (containing the remainder fatty acid chloride) with glutamic acid in the presence of a potassium hydroxide under typical aqueous Schotten Baumann reaction conditions to form compounds of Formula II;
• wherein, the molar ratio of O-acyl isethionates of Formula I to N-acyl glutamate of Formula II is in range of 1.0:1.0 to 1.0:10.0, and
• (ii) 0.5 to 2% by weight mixture of N-undecylenoyl glycine and N-capryloyl glycine;
• wherein, the total solids content of the composition is at least 45% w/w and the pH of the said aqueous composition is below 6.5.