Disclosed is a cationic water-soluble resin which comprises a (co)polymer of, in formula (I), repeating units (a) represented by formula (a) and repeating units (b) represented by formula (b), the content of the repeating units (a) in the (co)polymer being 100 to 0% by mole, the (co)polymer having in its molecule a carboxyl-containing group as one of the terminal groups and an aromatic ring-containing group as the other terminal group. The addition of this resin to ink compositions can realize the formation of images possessing excellent waterfastness and lightfastness and having no significant feathering or color bleeding. Likewise, the addition of this resin to a reaction solution for ink jet recording involving the deposition of two liquids, an ink composition and a reaction solution, onto a recording medium, can realize the formation of images possessing excellent waterfastness and lightfastness and no significant feathering or color bleeding.
wherein R1 represents hydrogen or methyl; R2 and R3 represent C1-3 alkyl; R4 represents hydrogen or methyl; R5, R6, and R7 represent C1-3 alkyl; Z- represents a counter ion; and k and 1 are each 1, 2, or 3.
本发明公开了一种阳离子
水溶性
树脂,它由式(I)、式(a)代表的重复单元(a)和式(b)代表的重复单元(b)组成的(共)聚合物,(共)聚合物中重复单元(a)的含量为 100 至 0%(以摩尔计),(共)聚合物分子中的一个末端基团为含羧基的基团,另一个末端基团为含芳香环的基团。将这种
树脂添加到油墨组合物中,可以形成具有优异耐
水性和耐光性的图像,并且不会出现明显的羽化或渗色现象。同样,在用于喷墨记录的反应溶液中加入这种
树脂,将油墨组合物和反应溶液这两种液体沉积到记录介质上,也能形成具有优异耐
水性和耐光性的图像,并且不会出现明显的羽化或渗色现象。
其中 R1 代表氢或甲基;R2 和 R3 代表 C1-3 烷基;R4 代表氢或甲基;R5、R6 和 R7 代表 C1-3 烷基;Z- 代表反离子;k 和 1 分别为 1、2 或 3。