Process for the preparation of a water soluble direct green poly

Details Process for the preparation of a water soluble direct green poly Process for the preparation of a water soluble direct green poly

1986-08-12

1987-10-13

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

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

Mixed dyes, noncomplexed

8437, 8673, 8687, 8918, 8919, C09B 4900, C09B 2900

Patent

active

046996281

ABSTRACT:
A process for the preparation of a water soluble direct green polyazo dyestuffs mixture in situ comprising phosgenation of a mordant yellow dye and an acid green dye using phosgene gas in an aqueous alkaline medium at a temperature between 50.degree. C. to 80.degree. C. and isolating or recovering the dyestuffs mixture from the phosgenation reaction mass and water soluble direct green polyazo dyestuffs mixture obtained thereby.

REFERENCES:
patent: B444294 (1976-03-01), Stryker
patent: 480326 (1892-08-01), Hoffmann
patent: 3898033 (1975-08-01), McLeod
patent: 3927963 (1975-12-01), Papa et al.
patent: 4235773 (1980-11-01), Huhne et al.
patent: 4260391 (1981-04-01), Lacroix
Colour Index, Third Edition, vol. 4 (Soc. Dyers and Colourists, 1971), O.I. 14045 and C.I. 20495, pp. (4059 and 4150).

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