Preparation of disperse azo dyestuffs in the presence of alkoxyl

Details Preparation of disperse azo dyestuffs in the presence of alkoxyl Preparation of disperse azo dyestuffs in the presence of alkoxyl

1998-05-27

1998-12-22

Powers, Fiona T.

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

Organic compounds

Azo

534575, 534859, 534887, C09B 4100, C09B 6710, C09B 6748

Patent

active

058521798

ABSTRACT:
The use of alkoxylated acetylenic diol surfactants in the aqueous synthesis of disperse azo dyes provides a simple process for improving filtration properties of dyestuff. The surfactants may be added prior to the coupling step of the synthesis or prior to heat treatment of the dye slurry. Advantages that are realized by incorporation of the surfactants into the synthesis include decreased filtration time, increased solid content in filter cake, improved washing properties of filter cake, and increased dye yield. In addition, for azo dyes that are synthesized as non-heat-stable crystal modifications, the presence of alkoxylated acetylenic diol surfactants in the dye slurry is effective in promoting the conversion of the dye to the desired thermally stable crystal modification.

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