| 摘要 |
<p>PURPOSE:To obtain a black dye composition giving an ink-jet recording ink which is excellent in printed image density, water resistance, image fade resistance in indoor storage, etc., by incorporating a specific azo compound as a major component. CONSTITUTION:A black dye composition is prepared using as a major component an azo compound represented by formula I (wherein R1 to R3 each is H, a 1-4C alkyl, methoxy, a halogen, a COOM, or a C0OR4, where R4 is a 1-4C alkyl and M is an alkali metal, ammonium, or an organoammonium). Examples of the azo compound include ones represented by formulae II and III. A compound represented by formula III can be produced as follows. First, m-chloroaniline is diazotized and then coupled with 2,5-dimethoxyaniline. The resulting monoazo compound is separated, diazotized, and then coupled with gamma acid. The resulting disazo compound is diazotized and then coupled with m-phenylenediamine-4-sulfonic acid to obtain the desired compound.</p> |
