The present invention provides a black dyestuff for inkjet recording which exhibits a good achromaticity as well as a good light-resistance and a recording liquid containing the black dyestuff.
In other words, the recording liquid for inkjet contains a metal chelated azo dyestuff the free acid group of which is represented by the following general formula (1) and optionally other water soluble dyestuffs:
1
(wherein the general formula (1) represents a compound having at least one or more hydrophilic group per molecule; M represents an arbitrary metal; A, B and C each independently represents an aromatic ring which may have arbitrary substituents; D represents an aromatic ring which may have arbitrary substituents other than azo group; m represents an integer of 0 to 1; n represents an integer of from 0 to 3; p represents an integer of from 0 to 2; q represents an integer of from 1 to 3, with the proviso that if there are a plurality of B's, they may be the same or different; R
1
and R
2
each independently represents hydrogen atom or arbitrary substituent; M can take tridentate or higher coordination in which M may take arbitrary ligand-to-metal coordination at arbitrary substituent or bond in the general formula (1) or with arbitrary ligands; and a metal ion may be further coordinated to A and B, B and B which are adjacent to each other with an azo group interposed therebetween if there are a plurality of B's or B and C in the form of —O-M-O—).
本发明提供了一种具有良好消色差和耐光性的喷墨记录用黑色
染料,以及一种含有该黑色
染料的记录液。
换句话说,喷墨记录液含有一种
金属螯合偶氮
染料,其
游离酸基由以下通式(1)表示,还可选择其他
水溶性
染料:
1
(其中通式(1)代表每分子至少有一个或多个亲
水基团的化合物;M 代表任意
金属;A、B 和 C 各自独立地代表一个芳香环,该芳香环可以有任意取代基;D 代表一个芳香环,该芳香环可以有偶氮基以外的任意取代基;m 代表 0 至 1 的整数;n 代表 0 至 3 的整数;p 代表 0 至 2 的整数;q 代表 1 至 3 的整数,但如果有多个 B,它们可以相同或不同;R
1
和 R
2
各自独立地代表氢原子或任意取代基;M 可以是三叉配位或更高配位,其中 M 可以在通式(1)中的任意取代基或键上进行任意
配体对
金属配位,或与任意
配体配位;如果有多个 B 或以 -O-M-O- 形式存在的 B 和 C,
金属离子可进一步与 A 和 B、相邻的 B 和 B 之间的偶氮基配位。)