Nippon Kayaku Kabushiki Kaisha

Taku Iino

Takashi Yoneda

Kenji Ooshima

Hitomi Muto

Satoshi Iwata

Kazuki Niimi

Hidenori Yakushiji

Yusuke Tone

Nozomi Onodera

Junya Masegi

Shinya Nagatsuka

Shunsuke Hori

The present invention includes a fused polycyclic aromatic compound represented by general formula (1), where in formula (1), one among Rand Ris represented by general formula (2) and represents a substituent having three to five ring structures, and the other among Rand Rrepresents a hydrogen atom, where in formula (2), n represents an integer of 0-2, Rrepresents a divalent linking group obtained by removing two hydrogen atoms from benzene or naphthalene, Rrepresents a divalent linking group obtained by removing two hydrogen atoms from an aromatic ring of an aromatic hydrocarbon, and when n is 2, a plurality of R's may be the same as or different from each other, Rrepresents an aromatic hydrocarbon group.

Fused polycyclic aromatic compound

A compound represented by formula (1) or a salt thereof, and an ink including the same. In formula (1), each Q independently represents a halogen atom; Rand Rindependently represent an alkyl group substituted by an ionic hydrophilic group; and Arepresents a C1-C3 alkoxy-substituted alkylamino group 

Water-soluble azo compound or salt thereof, ink and recording medium

An azo compound and an ink composition containing the azo compound are used as inks for ink jet recording and have excellent gas (ozone) resistance when recording is done on special ink jet paper. The azo compound is represented by formula (1) or a tautomer thereof, or a salt of these. In formula (1), Rrepresents a C1-C4 alkyl group, Rrepresents a cyano group, Rand Reach independently represent a C1-C4 alkoxy, R-Reach independently represent a group represented by formula (2), and R-Reach independently represent a nitro group. In formula (2), Ris an anilino group, and Ris a mono- or di-C1-C6 alkylamino group 

Azo compound, ink composition, ink jet recording method, and colored article

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Tokyo, Japan

Taku Iino