| 摘要 |
A compound of Formula (1) or a salt thereof useful as colorants for use in ink jet printing inks: wherein: A1 is optionally substituted phenyl; A2 is optionally substituted aryl; Q1 and Q2 are each independently an optionally substituted phenylene ring which is para connected to the—N═N—and the—NR—groups shown in Formula (1); and each R independently is H or a substituent; with the provisos that: (i) the compound of Formula (1) has at least one group selected from—SO3H and—PO3H2 groups; (ii) the compound of Formula (1) has more groups selected from—SO3H and—PO3H2 groups than the total number of—CO2H and—COSH groups; and (iii) the compound of Formula (1) is not of Formula (1a): |
