Process for the preparation of concentrated aqueous dye formulat

Details Process for the preparation of concentrated aqueous dye formulat Process for the preparation of concentrated aqueous dye formulat

1988-04-08

1989-06-13

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dye concentrate composition wherein an additional amount of...

8436, 8549, 8618, 8680, 8681, 8688, C09B 6726, D06L 312

Patent

active

048388955

ABSTRACT:
Concentrated aqueous dye formulations of anionic dyes are prepared from the corresponding crude dye solutions or suspensions, in which the anionic dyes are present as potassium, sodium/potassium or ammonium/potassium mixed salts, by desalinating and concentrating the solutions or suspensions by means of a membrane separation process. Sodium salts of mineral acids or lower organic carboxylic acids are added before or during this process in order to improve the solubility of the dyes and thus the stability of the dye formulations.

REFERENCES:
patent: 4329145 (1982-05-01), Koll et al.
patent: 4402701 (1983-09-01), Gleinig et al.
patent: 4452608 (1984-06-01), Erzinger
patent: 4523924 (1985-06-01), Lacroix
patent: 4648883 (1987-03-01), Podder
patent: 4689048 (1987-08-01), Fortsch et al.
patent: 4702744 (1987-10-01), Wolff et al.

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