Water-fastness in aqueous ink-jet inks containing water-soluble dyes is achieved by using a specific ionic species having a charge opposite to that on the dye molecule. Anionic dyes typically contain sulfonate (or carboxylate) anionic groups. Using at least one specific ionic species of opposite charge, specifically, phosphonium salts, causes the colorant components to "crash" or precipitate out of the water-based ink onto the print medium due to the formation of a suitable charge complex between the ionic parts of the dye and the opposite charge of the counter-ion species. Other positively charged salts, such as quaternary ammonium salts, carbonium salts, iodonium salts, sulfonium salts, and pyrillium salts may be used to improve aqueous dispersion stability and thus printability. Such additional cationic salt partially replaces the phosphonium salt(s). Alternatively, certain surfactants, such as aromatic ethoxylates, polyethylene oxide ethers, or polypropylene oxide ethers may be used to improve print quality.
在含有
水溶性
染料的
水性喷墨墨
水中,通过使用与
染料分子上的电荷相反的特定离子来实现
水韧性。阴离子
染料通常含有
磺酸盐(或
羧酸盐)阴离子基团。使用至少一种电荷相反的特定离子,特别是
鏻盐,可使
着色剂成分从
水基墨
水中 "碰撞 "或沉淀到印刷介质上,这是因为
染料的离子部分与反离子的相反电荷之间形成了合适的电荷复合物。其他带正电荷的盐类,如季
铵盐、羰基盐、
碘盐、锍盐和
吡啶盐,可用于改善
水分散稳定性,从而提高印刷适性。这些额外的阳离子盐可部分取代
鏻盐。另外,某些表面活性剂,如芳香族聚氧
乙烯醚、聚
环氧乙烷醚或聚环氧
丙烷醚也可用于改善印刷质量。