申请人:Kao Corporation
公开号:EP3165575A1
公开(公告)日:2017-05-10
The present invention provides a process for producing a colored fine particle dispersion suitably used in a water-based ink for ink-jet printing which can be produced by an emulsion polymerization method even when using a pigment having a quinacridone skeleton, is excellent in storage stability, and can provide printed characters or images having excellent rub fastness when printed on a recording medium; the colored fine particle dispersion; and a process for producing a water-based ink for ink-jet printing which includes the colored fine particle dispersion. The present invention relates to [1] a process for producing a colored fine particle dispersion including the step of subjecting a dispersion including a pigment, a polymerizable monomer, a surfactant, a polymerization initiator and water to emulsion polymerization, the pigment being a pigment having a quinacridone skeleton; the surfactant being an anionic or nonionic surfactant; and the polymerization initiator including an anionic or nonionic azo-based compound, [2] a colored fine particle dispersion including colored fine particles having an average particle size of not less than 10 nm and not more than 300 nm, and [3] a process for producing a water-based ink for ink-jet printing, including the step of mixing the obtained colored fine particle dispersion and an organic solvent B.
本发明提供了一种生产彩色细颗粒分散体的工艺,该分散体适合用于喷墨打印用水基墨水,即使在使用具有喹吖啶酮骨架的颜料时也可以通过乳液聚合法生产,具有优异的储存稳定性,并且在记录介质上打印时可以提供具有优异摩擦牢度的打印字符或图像;该彩色细颗粒分散体;以及一种生产包含该彩色细颗粒分散体的喷墨打印用水基墨水的工艺。本发明涉及[1]一种生产彩色细颗粒分散体的工艺,包括将包括颜料、可聚合单体、表面活性剂、聚合引发剂和水的分散体进行乳液聚合的步骤,其中颜料为具有喹吖啶酮骨架的颜料;表面活性剂为阴离子或非离子表面活性剂;2]一种彩色微粒分散体,包括平均粒径不小于 10 nm 且不大于 300 nm 的彩色微粒;以及[3]一种用于生产喷墨打印水基墨水的工艺,包括将获得的彩色微粒分散体与有机溶剂 B 混合的步骤。