| abstract |
Malonic acid dyes capable of forming polycondensation products have the formula ##STR1## where R 1 and R 2 are each independently of the other hydroxyl, C 1 -C 6 -alkoxy, chlorine or bromine, n R 3 is hydrogen or C 1 -C 6 -alkyl, n A is C 1 -C 20 -alkylene which may be interrupted by oxygen atoms or by imino or C 1 -C 4 -alkylimino groups, and n Chr is the radical of a chromophore derived from an anthraquinone, perylene, disazo or trisazo dye or else, when R 3 is C 1 -C 6 -alkyl, from a monoazo dye. |