Preparation of stable anionic dyestuff solutions: pressure perme

Details Preparation of stable anionic dyestuff solutions: pressure perme Preparation of stable anionic dyestuff solutions: pressure perme

1990-12-13

1992-03-17

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dye concentrate composition wherein an additional amount of...

8440, 8543, 8549, 8606, 8648, 8937, 8680, C09B 6754, C09B 6902

Patent

active

050964585

ABSTRACT:
Stable aqueous solutions of anionic dyestuffs, preferably reactive dyestuffs, are obtained at very low costs by pressure permeation, if the feed solution for the pressure permeation is prepared by stirring the optionally dried presscake or the suspension of the crude dyestuff in an electrolyte solution.

REFERENCES:
patent: 4648883 (1987-03-01), Podder
patent: 4684453 (1987-08-01), Vaughan
patent: 4808192 (1989-02-01), Narita et al.
patent: 4955987 (1990-09-01), Lacroix et al.

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