PROBLEM TO BE SOLVED: To provide water-based ink low in toxicity to living body, high in ink stability, having good hue, and capable of giving printed images with high fastness to light and ambient active gas, especially ozone gas.;SOLUTION: The water-based ink contains at least one dye of the general formula (1): A1-N=N-A2-N=N-A3 [wherein, A1, A2 and A3 are each a (substituted) aromatic group or heterocyclic group, wherein the ClogP of a diamino compound of the general formula (2):H2N-A2-NH2 (wherein, A2 means the same as A2 defined in the general formula (1)) formed when the azo group in the disazo dye of the general formula (1) is reductively split is 2.0 or less].;COPYRIGHT: (C)2007,JPO&INPIT
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机译：解决的问题：提供对活体毒性低，油墨稳定性高，色相良好，并能在光和环境活性气体（尤其是臭氧气体）中具有高坚牢度的印刷图像的水性油墨;解决方案：水性油墨包含至少一种通式（1）的染料：A 1 -N = NA 2 -N = NA 3 [其中，A 1 ，A 2 和A 3 分别是一个（取代的）芳族基团或杂环基，其中ClogP为通式（2）的二氨基化合物：H 2 NA 2 -NH 2 （其中A 2 “是指与通式（1）的双偶氮染料中的偶氮基被还原性拆分时形成的A 2 相同，[2.0以下]。 （C）2007，日本特许厅＆INPIT
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