Batchwise dyeing of cellulosic textile material with indigo by t

Details Batchwise dyeing of cellulosic textile material with indigo by t Batchwise dyeing of cellulosic textile material with indigo by t

1997-07-09

1999-12-21

Einsmann, Margaret

Bleaching and dyeing; fluid treatment and chemical modification

Dye or potential dye composition, additive, treatment,...

Sulfur dye or vat dye

8618, 8918, D06P 122, D06P 360

Patent

active

06004358&

ABSTRACT:
The disclosure is a process for batchwise dyeing of cellulosic textile material with indigo by the exhaust method, which comprises applying the reduced indigo to the textile material from an aqueous dyeing liquor which includes a reductant, an alkali and additionally a further dissolved alkali metal salt in a concentration of from 200 to 350 g/l as electrolyte and whose pH has been set to 10.2-11.3, oxidizing the reduced indigo on the fiber back to the pigment while maintaining the high electrolyte concentration, and finishing the dyeing in a conventional manner.

REFERENCES:
patent: 4342565 (1982-08-01), Teague et al.
patent: 5514187 (1996-05-01), McFarland et al.
Vat Dyestuffs and Vat Dyeing, M. R. Fox, John Wiley & Sons Inc p. 80, 88, 1948.

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