| abstract |
Perfluorinated surface-active block or random oligomers of the formula ##STR1## where R denotes a C 2 -C 18 -hydrocarbon or -hydrofluorocarbon radical, n Y denotes a C 6 -C 13 -fluorocarbon or -hydrofluorocarbon radical which can contain a chain oxygen atom, n Z denotes a group which confers solubility in water and n p and q denote integers or decimal numbers from 0.5 to 30 n are provided. They are suitable for use in cosmetic compositions for the treatment of hair. They slow down the flow of sebum and the rate at which hair becomes greasy again. |