Preparation of a blue anthraquinonoid disperse dye of 1,4-naphthoquinone-[2,]-phthalimides
AssigneeBASF SE
InventorsEberhard Michaelis, Helmut Hoch
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Abstract
Blue anthraquinonoid disperse dyes are prepared by reacting a 1-amino-4-nitroanthraquinonecarboxamide (II) with a cyanide in an aqueous medium in the presence of hydroxyl ion acceptors at above 20.degree. C. by a process in which the reaction is carried out in water at a pH of from 7.5 to 10.5 and in the presence of one or more quaternary ammonium salts at from 60.degree. to 100.degree. C. The process gives disperse dyes which are similar to C.I. Disperse Blue 87 and have similar color properties in high yields by an environmentally compatible process, the said disperse dyes having excellent properties.
Claims20
A process for the preparation of a blue anthraquinonoid disperse dye by reacting a 1-amino-4-nitroanthraquinonecarboxamide of the formula (II) ##STR3## where R is C.sub.1 -C.sub.6 -alkyl, 2-(C.sub.1 -C.sub.6 -alkoxy)ethyl, 3-(C.sub.1 -C.sub.6 -alkoxy)propyl or 3-[2'-(C.sub.1 -C.sub.4 -alkoxy)ethoxy]propyl, with a cyanide in water in the presence of a hydroxyl ion acceptor at from 60.degree. to 100.degree. C., at a pH of from 7.5 to 10.5 and in the presence of one or more quaternary ammonium salts.
Dependencies are inferred from the claim text.