| 摘要 |
This invention relates to inks for graphic plotting devices. The inks of this invention are useful for plotting images on transparent, polymeric substrates. A major problem with inks that are used to generate images on polymeric substrates for visual presentation is that these inks are unable to both maintain long open-cap life and provide rapid drying time on these substrates. The ink composition of this invention comprises as essential ingredients: (1) a dye capable of providing the desired color permanence and (2) a liquid vehicle that is capable of dissolving sufficient quantities of the selected dye and does not disrupt the surface of the liquid-sorbent imaging media. The preferred vehicle has a boiling point in excess of about 150 DEG C at normal atmospheric pressure in order to provide a long open cap life. The ink composition of this invention is particularly useful with composite liquid-sorbent media comprising a liquid sorbent underlayer and, overlying said underlayer, a liquid-permeable surface layer, the liquid sorptivity of said under-layer being greater than the liquid sorptivity of said surface layer. |
