Image-recording, hydrophilic colorants represented by the below-described formula (1) are disclosed. These colorants can be provided as colorants capable of forming images excellent in print quality such as chroma, gloss, density, light fastness and abrasion fastness, and also as hydrophilic colorants capable of affording inks excellent in physical properties such as long-term storability and press stability. [organic pigment]−[linking group] −[hydrophilic compound] wherein the [organic pigment] is a hydrophobic pigment having no hydrophilic group by itself, the [linking group] is a group linking the [organic pigment] and the [hydrophilic compound] with each other and blocking an effect of the [hydrophilic compound] on the [organic pigment], and the [hydrophilic compound] is an anionic, cationic and/or nonionic, hydrophilic compound.
本发明公开了以下述式(1)为代表的图像记录型亲
水着色剂。这些
着色剂既可以作为
着色剂形成色度、光泽、密度、耐光性和耐磨性等印刷质量优异的图像,也可以作为亲
水性
着色剂提供长期储存性和印刷稳定性等物理特性优异的油墨。[
有机颜料]-[连接基团]-[亲
水性化合物],其中[
有机颜料]是一种本身没有亲
水基团的疏
水性
颜料,[连接基团]是将[
有机颜料]和[亲
水性化合物]相互连接并阻止[亲
水性化合物]对[
有机颜料]产生影响的基团,[亲
水性化合物]是一种阴离子、阳离子和/或非离子亲
水性化合物。