Nippon Kayaku Kabushiki Kaisha

Hideshiro Nomura

Yasuo Shirasaki

Mariko Umeda

Eiichi Ogawa

Yasushi Yamada

Hiroshi Ozawa

Masae Gomi

Formazane compounds and method of dyeing using the same

An azo compound which in the free acid form is represented by the following formula: ##STR1## where R.sub.1 stands for methyl, ethyl, R.sub.2 stands for hydrogen, methyl, methoxy or ethoxy, R.sub.3 stands for hydrogen or methyl, and K stands for ##STR2## wherein the benzene nucleus A may be further substituted by methyl, amino, acetylamino or methoxy or: ##STR3## wherein these naphthalene neuclei may be further substituted by hydroxy, amino or acetylamino, also a process for preparing the azo compound and a dyeing method using said azo compound.

Azo compounds

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Saitama, Japan

Hideshiro Nomura