Sakai Chemical Industry Co., Ltd.

Kenzo Konishi

Yoshihiko Nakane

Akira Kotone

Iro Yamase

Teijiro Kitao

Takeshi Hori

Masahiro Hoda

A polyazo dye represented by the formula ##SPC1## Wherein A is an optionally substituted aromatic ring; B is an aromatic ring having at least one substituent selected from the group consisting of amino, substituted amino and hydroxy; Y is hydrogen, alkali metal, --NH.sub.4 or amine salt residue; n is 1 or 2; and one of R.sup.1 and R.sup.2 is hydroxy and the other is amino.

Trisazo dye containing a diphenylenesulfone structure

A polyazo dye represented by the formula ##SPC1## Wherein A is an aromatic ring having or not having a substituent, B is an aromatic ring having at least one substituent selected from the group consisting of amino, substituted amino and hydroxyl, Y is hydrogen, alkali metal, --NH.sub.4 or an amine salt residue, n is 1 or 2, and each of R.sup.1 and R.sup.2 is hydroxyl or amino, R.sup.1 being amino when R.sup.2 is hydroxyl and hydroxyl when R.sup.2 is amino. The polyazo dye has outstanding utility in the dyeing of fibers having hydroxyl and/or amide groups and are not carcinogenic.

Trisazo compounds containing a diphenyl-tetrazinyl component

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Nishinomiya, Japan

Kenzo Konishi