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.
Claims17
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.
A method of producing a compound represented by the general formula (1), characterized by comprising reacting a disazo compound represented by the following general formula (5):
- wherein m and n each independently represent 1 or 2;
- and M1 represents a hydrogen atom, alkali metal, alkaline earth metal, cation of an organic amine, or ammonium ion, with sodium hypochlorite in water.
Dependencies are inferred from the claim text.