Solid pigment composition for pigment ink pigment ink containing the same and process for preparing these
申请人:Nagaswa Toshiyuki
公开号:US20050020728A1
公开(公告)日:2005-01-27
The present invention provides a process for preparing a solid pigment composition for pigment ink comprising the steps of (a) dissolving polyvinyl alcohol in water, and dispersing pigments in the resulting solution; (b) adding aldehyde derivatives to the resulting pigment dispersion and allowing the polyvinyl alcohol to react with the aldehyde derivatives to prepare polyvinyl acetal; and (c) drying the acetalated pigment dispersion. The pigment ink resulted from the process, employs water-soluble solvents (for example, alcohol solvent, glycol solvent or other non-toxic solvents), contains sufficient amount of pigments, has low concentration with good pigment dispersion and storage stability, and shows good writing or recording ability with improved color-development.
本发明提供了一种用于制备颜料墨水的固体颜料组合物的工艺,包括以下步骤:(a) 将聚乙烯醇溶解在水中,并将颜料分散在所得溶液中;(b) 在所得颜料分散液中加入醛衍生物,并使聚乙烯醇与醛衍生物反应制备聚乙烯醇缩醛;(c) 干燥缩醛颜料分散液。该工艺制得的颜料墨水采用水溶性溶剂(如醇溶剂、乙二醇溶剂或其他无毒溶剂),含有足量颜料,浓度低,颜料分散性和储存稳定性好,书写或记录能力强,显色性好。