| abstract |
A surfactant composition having a yield point, especially detergent, comprising, based on the total weight thereof, (i) at least one anionic 2,5-diketopiperazine compound of the formula (I) in which R1, R2, R3, R4 and R5 are as defined in claim 1 and (ii) at least one nonionic 2,5-diketopiperazine compound of the formula (III) in which R1, R2, R3, R4 and R5 are as defined in claim 1 and (iii) a total amount of 0.1% to 70% by weight of at least one surfactant and (iv) water are storage-stable even in the case of incorporation of solid particles. The surfactant compositions are of excellent suitability as detergent compositions for use in a machine washing process. |