Concentrated aminoanthraquinone blue colorants

Details Concentrated aminoanthraquinone blue colorants Concentrated aminoanthraquinone blue colorants

1997-08-15

1998-05-26

Henley, III, Raymond

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C07C21100

Patent

active

057568448

ABSTRACT:
To produce a concentrated solution of aminoanthraquinone dyes in aromatic solvent, quinizarin or a leuco derivative thereof is reacted with a mixture of at least three aliphatic amines in a solvent which is a glycol or a glycol ether. The glycol or glycol ether solvent is present in an amount of 50 wt % or less relative to the quinizarin or leuco derivative plus amines. After the reaction, water and excess amine are stripped and aromatic solvent is added to adjust the dye concentration to the desired concentration above 40 wt % dye.

REFERENCES:
patent: 4602913 (1986-07-01), Grollier et al.
patent: 4746461 (1988-05-01), Zielske

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