abstract |
Described is the use, as an additive to phosphate-reduced and phosphate-free washing and cleaning agents, of carboxyl-group-containing reaction products of (a) maleic acid anhydride, maleic acid and/or fumaric acid and (b) proteins or hydrolysed proteins, the reaction products having an acid number of at least 1.5 mmol of NaOH per gram of reaction product. |