Nippon Kayaku Kabushiki Kaisha

Shinjiro Takahashi

Yasuo Shirasaki

Yoshiyuki Dejima

The present invention relates to a water-soluble azo compound for yellow represented by the following formula (1) wherein, A represents a hydroxy group, a morpholino group, an amino group, an aliphatic amine residue which may have a substituent, an aromatic amine residue which may have a substituent, a phenoxy group which may have a substituent, or an alkoxy group which may have a substituent, Rrepresents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, Rrepresents a hydrogen atom, a nitro group or a hydroxy group, and n represents an integer number of 1 to 3, respectively as a free acid, and an ink composition containing the same; said ink composition has good stability and is suitable for inkjet printing; and printed matters therewith have very high fastness such as ozone fastness and the like.

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Kita-ku, Japan

Shinjiro Takahashi