Polykondensationsfarbstoffe. Ein neues Prinzip zur Herstellung naßechter Baumwollfärbungen

Azo Dyes

“…These include the polycondensation dyes, in particular in the azo range, which contain thiosulfate groups (-S-SO 3 -) as watersolubilizing groups. In the presence of condensing agents (e.g., sodium sulfide), these compounds undergo polycondensation on the fiber to form insoluble dyes, S-S bridges being formed at the same time (e.g., Inthion dyes from Hoechst) [275], [276]. A further example is that of esterified Naphtol AS dyes.…”