Process for inhibiting crust formation in reduced dye baths

Details Process for inhibiting crust formation in reduced dye baths Process for inhibiting crust formation in reduced dye baths

1979-10-30

1981-08-25

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

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

Sulfur dye or vat dye

8452, 8652, 8653, 8908, 8909, 8912, C09B 6728, C09B 700

Patent

active

042856957

ABSTRACT:
An improved sodium hydrosulfite dye reducing composition is described for reducing vat or sulfur dye in aqueous dye bath solutions, comprised of sodium dithionite, at least 1 percent sodium sulfite by weight of sodium dithionite, and stabilized by alkali metal hydroxide, the improvement characterized by including in this composition an effective surface crust inhibiting amount of an anionic surfactant selected from the group consisting of alkyl sulfates, alkyl aryl phosphate esters, N-acyl-N-alkyl taurates, .alpha.-olefin sulfonates, alkyl aryl disulfonates, dodecylated oxydibenzene sulfonates, and mixtures thereof.

REFERENCES:
patent: 1794805 (1931-03-01), Strosacker et al.
patent: 1881745 (1932-10-01), Lindner
patent: 1915326 (1933-06-01), Masterson
patent: 2233101 (1941-02-01), Kern
patent: 3054658 (1962-09-01), Franklin et al.
patent: 3353909 (1967-11-01), Janson et al.
patent: 3468623 (1969-09-01), van Damme-van Weele
patent: 4166717 (1979-09-01), Fond et al.
Fox, M. R., "Vat Dyestuffs and Vat Dyeing", (Wiley, New York), 1948, pp. 84-88.

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