VERFAHREN ZUR HERSTELLUNG EINES BLAUEN ANTHRACHINOIDEN DISPERSIONSFARBSTOFFS.

摘要

Prodn. of blue anthraquinone-type disperse dyes (I) comprises reacting the anthraquinone-2-carboxamide deriv. (II) with cyanide in aq. medium in presence of OH-ion trapping agent. The new feature is that reaction is in water of pH 7.5-10.5, in presence of at least one quat. ammonium salt (A) at 60-100 deg.C. R = 1-6C alkyl; 2-(1-6C alkoxy)ethyl, 3-(1-6C alkoxy)propyl or 3-(2-(1-4C alkoxy)ethoxy)propyl. Pref. reaction is at pH 7.6-10 and 70-95 (85-90) deg.C.