Symmetrical trisazo dye obtained by coupling tetrazotized 4-4'-d

Details Symmetrical trisazo dye obtained by coupling tetrazotized 4-4'-d Symmetrical trisazo dye obtained by coupling tetrazotized 4-4'-d

1979-04-25

1981-02-03

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260169, C09B 3536, C09B 3538, D06P 324, D06P 332

Patent

active

042487765

ABSTRACT:
The present invention concerns a new acid trisazo dye suited for the dyeing of natural and synthetic polyamidic fibres and particularly for the dyeing of leather. The dye has the following structural formula: ##STR1## and dyes in a full black shade. The present invention also includes a process for the preparation of dye (I) and comprises tetrazotizing 4-4' diaminoazobenzene and then coupling the tetrazo-compound thus formed with 2 molecules of 2-carboxymethylamino-8-naphtol-6-sulphonic acid (carboxy methyl-gamma acid) in an alkaline medium.

REFERENCES:
patent: 3928313 (1975-12-01), Papa et al.
Color Index, 3rd Edition, vol. 4, p. 4286, #30260, (1971).
Cassella, Chemical Abstracts, vol. 65, #9064f, (1966).
Color Index, 3rd Ed., vol. 4, pp. 4292 to 4295, CI's 31515, 31545, 31580 and 31610, (1971).

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