公开(公告)号：US20160280942A1

公开(公告)日：2016-09-29

申请号：US15037241

申请日：2014-11-20

Applicant: KAO CORPORATION

Inventor： Teruyuki FUKUDA ,  Satoshi TANAKA ,  Takeshi ASHIZAWA ,  Daisuke HAMADA

IPC: C09D11/107 ,  C09D11/037 ,  C09D11/033 ,  C09D11/322

Abstract: The present invention relates to [1] a water-based pigment dispersion for ink-jet printing including pigment particles and water, in which a scattering intensity area ratio of components included in the range of from 0 to −60 mV in a normalized zeta potential distribution 4 that is determined through specific zeta potential measurement steps is not more than 40%, and the like, and [2] a process for producing the water-based pigment dispersion for ink-jet printing, including production step (1) of subjecting a mixture including water, a pigment, a water-dispersible polymer and an organic solvent having a solubility in water of less than 40% by mass to dispersing treatment until a volume-average particle size of the pigment particles is decreased to not more than 180 nm to obtain a pigment dispersion; production step (2) of adding water to the resulting pigment dispersion, followed by maintaining the resulting dispersion at a temperature of not higher than 40° C. for a period of from 4 h to 48 h; and production step (3) of removing the organic solvent from the pigment dispersion to obtain the water-based pigment dispersion. The water-based pigment dispersion for ink-jet printing according to the present invention is excellent in ejection durability and can be prevented from suffering from deterioration in optical density even when used for printing over a long period of time.

Abstract translation: 本发明涉及[1]一种用于喷墨印刷的水性颜料分散体，其包括颜料颗粒和水，其中包含在标准化ζ电位中0至-60mV范围内的组分的散射强度面积比 通过特定的ζ电位测定步骤确定的分布4不超过40％等，[2]一种喷墨印刷用水性颜料分散体的制造方法，包括制造工序（1） 包括水，颜料，水分散性聚合物和在水中的溶解度小于40质量％的有机溶剂的分散处理，直到颜料颗粒的体积平均粒径降至不大于180 nm以获得颜料分散体; 制备步骤（2），向所得颜料分散体中加入水，然后将所得分散体在不高于40℃的温度下保持4小时至48小时; 和从颜料分散体中除去有机溶剂的制备步骤（3），得到水性颜料分散体。 根据本发明的用于喷墨打印的水性颜料分散体具有优异的喷射耐久性，并且即使长时间用于印刷也可以防止光密度的劣化。