Azo compound, aqueous dye solutions containing the same, inks and use thereof
AssigneeNippon Kayaku Kabushiki Kaisha
InventorsHirokazu Kitayama, Yasuo Shirasaki, Takahiko Matsui, Hiroaki Ohno
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Abstract
An azo compound which is reduced in the copper ion content and exhibits hue and clarity suitable for ink-jet recording and which can give records having excellent light fastness, water resistance, and moisture proofness, and such ozone resistance as to control the fading and the discoloration; and water-base yellow inks containing the same. In particular, the azo compound represented by the formula (12) having a content of impurity copper ions of 100 ppm or below or salts thereof, and inks containing the same
Claims16
An azo compound represented by the following formula (12) having a content of copper ions as impurity of 100 ppm or less, or a salt thereof
Dependencies are inferred from the claim text.