Patent ID: 7727948

Claim:
A mixture comprising a surfactant and a cosurfactant, wherein the cosurfactant is an amphiphilic polymer with the structure formula in which A′ is an unbranched or branched alkyl, cycloalkyl, aryl or aralkyl radical having 1 to 60 carbon atoms, Y is S or O, wherein A′-Y is a monofunctional unbranched or branched alcohol or thiol radical having 8 to 30 carbon atoms per molecule, A is a structural unit with the formula in which R 1 , R 2 , R 3 and R 4 independently of one another, are the substituents hydrogen, methyl, ethyl, n-propyl, isopropyl, octyl or phenyl, with the restriction that at most three of the substituents R 1 , R 2 , R 3 and R 4 are hydrogen, m is a number in the range from 10 to 300, X is a structural unit with the formula in which the substituents R 1 , R 2 , R 3 and R 4 independently of one another, are each hydrogen, methyl, ethyl, n-propyl, isopropyl, octyl or phenyl, q=1, B is a monomeric subunit based on ethylene oxide or a mixture of ethylene oxide and propylene oxide, n is a number in the range from 20 to 500 and p=q+1.