Color bleed on paper media printed by ink-jet is alleviated by altering the dyes such that they become more bleed resistant. To this end, an organic compound with surfactant properties is substituted as the dye counter-ion. Specifically, a dye having one or more sulfonate or carboxylate groups is provided with a counter-ion comprising an amine having the formula given by
⁺N-(CH₃)mH3-m-(CH₂)n-R
where m ranges from 1 to 3, n ranges from 3 to 6, and R a hydrophilic substituent or cycloaliphatic or aromatic group with a hydrophilic substituent. An ink employing the dye of the invention comprises (a) about 0.5 to 40 wt% of one or more low vapor pressure solvents (b) about 0.5 to 5 wt% one or more water-soluble dyes in which one or more of the counter-ions have been substituted with the above amine, and (c) the balance water.
通过改变
染料使其具有更强的抗渗性,可以减轻喷墨打印纸张介质上的渗色现象。为此,一种具有表面活性剂特性的有机化合物被替代为
染料的反离子。具体地说,具有一个或多个
磺酸盐或
羧酸盐基团的
染料被提供一个反离子,该反离子由具有如下式子的胺组成
⁺N-(CH₃)mH3-m-(CH₂)n-R
其中 m 为 1 至 3,n 为 3 至 6,R 为亲
水取代基或带有亲
水取代基的环脂族或芳香族基团。采用本发明
染料的墨
水包括:(a) 约 0.5 至 40 wt%的一种或多种低蒸汽压溶剂;(b) 约 0.5 至 5 wt%的一种或多种
水溶性
染料,其中一种或多种反离子已被上述胺取代;(c) 余量为
水。