Bleaching and dyeing; fluid treatment and chemical modification – Dye concentrate composition wherein an additional amount of...
Patent
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.
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Galli Roberto
Kvita Petr
Ciba-Geigy Corporation
Clingman A. Lionel
Mansfield Kevin T.
McC. Roberts Edward
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