Nippon Kayaku Kabushiki Kaisha

Junya Masegi

Takashi Yoneda

Ryoutarou Morita

Kenji Ooshima

Taku Iino

Mitsunori Anan

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

Disclosed are: a yellow dye which has a color phase having a high contrast ratio suitable for inkjet recording, can produce recorded materials having high durability, and can be used for the preparation of an ink composition to provide an ink composition having excellent storage stability; and an ink composition containing the yellow dye. Specifically disclosed are: a water-soluble azo compound represented by formula (1) or a salt thereof; and an ink composition containing the compound or the salt thereof. The ink composition has a color phase and a color saturation suitable for inkjet recording, can produce recorded materials having high durability, particularly high light resistance and ozone gas resistance, and can also produce printed images having excellent storage stability or the like. In the formula, Q represents a halogen atom; R represents a C1-C11 alkylene group; p represents an integer of 2 to 4; and n represents 1 or 2. 

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Tokyo, Japan

Junya Masegi