Process for continuous dyeing of cellulose-containing yarn with

Details Process for continuous dyeing of cellulose-containing yarn with Process for continuous dyeing of cellulose-containing yarn with

1998-02-04

1999-08-10

Einsmann, Margaret

Bleaching and dyeing; fluid treatment and chemical modification

Reactive gas or reactive vapor utilized in dye process

8653, 8918, D06P 122

Patent

active

059352736

ABSTRACT:
A process for continuous dyeing of cellulose-containing yarn with indigo in a single passage applies reduced indigo from an aqueous dye liquor containing deoxidants, alkali and a dissolved alkali metal salt at a concentration of 100 to 200 g/l as an electrolyte at a pH value of the liquor adjusted to about 10.2 to 11.3, while maintaining the electrolyte concentration, exposing the yarn to a gas which dissolves in the aqueous medium while forming an acid, and then oxidizing reduced indigo in the yarn to form pigment and finishing the dyeing process in a customary manner.

REFERENCES:
patent: 3457022 (1969-07-01), Fields
patent: 4536907 (1985-08-01), Zumbrunn et al.
patent: 4845789 (1989-07-01), Morton et al.
patent: 5295998 (1994-03-01), Merritello et al.
Fox, M.R Vat Dyestuffs and Vat Dyeing, John Wiley and Sons Inc, New York, pp. 80-88, 1947.

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