申请人:Matsui Takahiko
公开号:US20090062545A1
公开(公告)日:2009-03-05
The present invention relates to a trisazo compound represented by the following formula (1) or a salt thereof,
The formula (1)
(wherein, the group A is a substituted phenyl group, the group B and the group C are substituted para-phenylene groups, R
1
represents a C1 to C4 alkyl group (which may be substituted by a carboxy group), a phenyl group (which may be substituted by a sulfo group), or a carboxy group,
R
2
represents a cyano group, a carbamoyl group or a carboxy group, each of R
3
and R
4
independently represents a hydrogen atom, a methyl group, a chlorine atom or a sulfo group, respectively) and a water-based black ink composition containing said compound; said compound has high solubility in a medium where the main component is water, its aqueous solution having a high concentration and ink are stable when stored for a long period of time, black-recorded images with it can be provided where both light fastness and ozone gas fastness of the printed images are excellent.