Preparation of permanent color inks from water-soluble colorants using specific phosphonium salts
申请人:Hewlett-Packard Company
公开号:EP1020498A1
公开(公告)日:2000-07-19
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。