| 摘要 |
<p>Color bleed (the invasion of one color into another on the surface of the print medium) using ink-jet inks is controlled by employing high molecular weight colloids, such as alginates, in conjunction with amphoteric surfactants and/or non-ionic amphiphiles. The inks of the invention comprise a vehicle and a dye. The vehicle typically comprises a low viscosity, high boiling point solvent, one or two surfactants at concentrations above their critical micelle concentration (cmc), while the dye typically comprises any of the dyes commonly employed in ink-jet printing. The amount of surfactant is described in terms of its critical micelle concentration (cmc), which is a unique value for each surfactant system. Above the cmc, colloidal species form, which attract the dye molecules and thus control the color bleed. Below the cmc, there is no colloid, and thus poor control of the color bleed results. Also, the presence of the high molecular weight colloid further improves the text print quality and renders sharper definition among colors printed adjacent one another. <IMAGE></p> |
