Stabilization of anionic indole dyestuffs

Details Stabilization of anionic indole dyestuffs Stabilization of anionic indole dyestuffs

1978-02-09

1981-01-20

Schofer, Joseph L.

Bleaching and dyeing; fluid treatment and chemical modification

Organic additive for dye composition, dye composition...

Five-membered hetero ring consisting of one nitrogen and...

8602, 260208, 260165, D06P 1645, D06P 1647

Patent

active

042459958

ABSTRACT:
Azo dyestuffs which contain, as the coupling component an indole of the formula ##STR1## wherein R denotes an optionally substituted alkyl radical, an optionally substituted aryl radical or an optionally substituted aralkyl radical, and the benzene ring A can be further substituted,
frequently exhibit an undesired irreversible change in the color shade in acid solutions, which surprisingly can be prevented by adding nitrogen-containing complex-forming substances.

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patent: 2308021 (1943-01-01), Munz
patent: 2858319 (1958-10-01), de Benneville
patent: 3867369 (1975-02-01), Sommer et al.
patent: 3883502 (1975-05-01), Sommer et al.
patent: 3891619 (1975-06-01), Sommer et al.
patent: 3925350 (1975-12-01), Wolfrum et al.
patent: 3956267 (1976-05-01), Sommer et al.
Pitts, L. American Dyestuff Reporter (ADR) Oct. 7, 1957 pp. 738-739.
Gard, A. J. ADR Dec. 21, 1953 pp. 867-870.
Zussman, H. W. ADR Jun. 27, 1949 pp. 500-504.
Millson, H. E. ADR Jan. 30, 1956 pp. 66-81.

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