Abstract:
Compositions comprising: (A) at least one surfactant of the general formula (I)wherein the sequence of the alkyleneoxy units is arbitrary, each Rindependently represents a moiety selected from the group consisting of linear and branched C-C-alkyl, C-C-alkenyl, C-C-alkynyl, (C-C-alkyl)carbonyl, (C-C-alkenyl)carbonyl and (C-C-alkynyl)carbonyl, k represents 1 or 2 and x1 and x2 each independently represent an integer of 0 to 20, the sum of x1 and x2 being a number of 1 to 20; and (B) at least one thickener comprising at least two hydrophobic groups Rwhich are linked to one another via a bridging hydrophilic group (α), wherein each R, independently represents a moiety selected from the group consisting of C-C-alkyl, C-C-alkenyl, C-C-alkynyl, cycloalkyl, aryl, and aryl-C-C-alkyl, which in each case may have up to 3 hydroxyl substituents; wherein the composition has a pH which is viscosity-dependent.