Process for the preparation of concentrated 1:2 metal complex dy

Details Process for the preparation of concentrated 1:2 metal complex dy Process for the preparation of concentrated 1:2 metal complex dy

1989-11-28

1991-05-28

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Dye concentrate composition wherein an additional amount of...

8685, C09B 6754, C09B 4501

Patent

active

050191322

ABSTRACT:
Stable, concentrated, liquid preparations of 1:2 metal complex azo or azomethine dyes containing at most one sulfonic acid group are obtained by metallizing the metal-free azo or azomethine intermediates in form of their moist, almost salt-free washed, filter cakes with aqueous slurries of complex forming, preferably cobalt or chromium salts. Without isolation of the thus obtained metal complex dyes the dye slurries are then in situ converted into the stable, concentrated dye preparations by adjusting them to a final dye concentration.
The dye preparations are produced in a very economic manner by avoiding any isolation of the metal complex dyes after the metallization step and by considerably reducing the amounts of effluents.
The dye preparations obtained are suitable for the preparation of dye-baths or printing pastes which may be used in particular for dyeing and printing textile materials made of natural or synthetic polyamide fibres, and further of leather and paper.

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