WATER SOLUBLE DYESTUFFS

摘要

New water-soluble disazo dyestuffs of the formula B1-N=N-Z-N=N-B2 (I) wherein Z denotes a bivalent radical of 2-phenyl-benzo-imidazole, -oxazole or thiazole, B1 is monovalent radical of a N-substituted amino naphtol-mono- or disulphonic acid and B2 is the radical of a coupling component, their process of production and their use for obtaining fast dyeings and prints on natural or synthetic fibre materials containing hydroxyl groups or nitrogen.