摘要:
Useful vat dyestuffs can be prepared by reacting a mixture of aminoanthraquinones containing 65-80% 1-aminoanthraquinone and 20-35% of a mixture containing 2-aminoanthraquinone and 1,5- and 1,8-diaminoanthraquinones with, for example, a halogenated benzanthrone or anthraquinone. The mixture of aminoanthraquinones can be obtained by nitrating anthraquinone in sulfuric acid and thereafter reducing the resulting nitroanthraquinones.
摘要:
New brown vat dyes prepared by heating a compound of the formula
IN A MELT COMPRISING ANHYDROUS ALUMINUM CHLORIDE AND UREA, PYRIDINE, PICOLINE OR LUTIDINE OR A COMBINATION THEREOF, IF DESIRED, IN THE PRESENCE OF A HALOGENATING AGENT. Said dyes are suitable for dyeing various kinds of fibrous material, but as they can not be directly defined by a structural formula, they are defined by the process for preparing them.