PIGMENT DISPERSION INCLUDING AZO PIGMENT AND AQUEOUS INK FOR INKJET RECORDING USING THE SAME
申请人:FUJIFILM Corporation
公开号:EP2474580A1
公开(公告)日:2012-07-11
The invention provides pigment dispersion capable of preparing aqueous ink for inkjet recording, the particle size of which is not changed after storage for a long period of time or even after being exposed to a high temperature condition, generation of streaks and unevenness are controlled, which aqueous ink is capable of forming uniform printed images excellent in light fastness. Another object is to provide aqueous ink for inkjet recording using the pigment dispersion.
A pigment dispersion including vinyl polymer particles containing A and B:
A: an azo pigment represented by the following formula (1), a tautomer thereof, a salt thereof, a hydrate thereof, or a solvate thereof,
B: a vinyl polymer containing a structural unit (a) having a non-aromatic alicyclic group bonded to the polymer main chain via a linking group, and a structural unit (b) having a hydrophilic group,
wherein Q represents a nonmetallic atomic group necessary to form a 5-, 6- or 7-membered heterocyclic ring together with a carbon atom; W represents an alkoxy group, an amino group, an alkyl group or an aryl group; each of X1 and X2 independently represents a hydrogen atom, an alkyl group, an acyl group, an alkylsulfonyl group, or an arylsulfonyl group; R1 represents a hydrogen atom or a substituent; R2 represents a heterocyclic group; n represents an integer of 1 to 4, and when n is 2, formula (1) represents a dimer via Q, W. X1, X2, R1 or R2, when n is 3, formula (1) represents a trimer via Q, W, X1, X2, R1 or R2, and when n is 4, formula (1) represents a tetramer via Q, W, X1, X2, R1 or R2.
本发明提供了能够制备喷墨记录用水性墨水的颜料分散体,这种水性墨水的粒径在长期储存甚至暴露在高温条件下后都不会发生变化,条纹和不均匀的产生也得到了控制,这种水性墨水能够形成光牢度极佳的均匀印刷图像。另一个目的是提供使用该颜料分散体的喷墨记录水性墨水。
颜料分散体包括含有 A 和 B 的乙烯基聚合物颗粒:
A:由下式(1)表示的偶氮颜料、其同系物、其盐、其水合物或其溶液、
B:乙烯基聚合物,含有通过连接基团与聚合物主链结合的具有非芳香脂环基的结构单元 (a) 和具有亲水基团的结构单元 (b)、
其中 Q 代表与碳原子一起形成 5、6 或 7 元杂环所需的非金属原子团;W 代表烷氧基、氨基、烷基或芳基;X1 和 X2 各自独立地代表氢原子、烷基、酰基、烷基磺酰基或芳基磺酰基; R1 代表氢原子或取代基; R2 代表杂环基; n 代表 1 至 4 的整数,当 n 为 2 时,式(1)通过 Q、W 代表二聚体。X1、X2、R1 或 R2 表示二聚体;当 n 为 3 时,式 (1) 通过 Q、W、X1、X2、R1 或 R2 表示三聚体;当 n 为 4 时,式 (1) 通过 Q、W、X1、X2、R1 或 R2 表示四聚体。