| abstract |
Ink-jet ink compositions are provided which exhibit fast dry times and bleed-free prints when printed onto a print medium so that the throughput of an ink-jet printer may be increased. The ink compositions of the invention comprise (a) at least one dye; (b) at least one high-boiling, water-insoluble organic compound; (c) at least one amphiphile; and (d) water. The dye may be either water-soluble or water-insoluble and the high boiling organic compound has a vapor pressure low enough such that only water evaporates from the ink during normal printing operations. The amphiphile is present in an amount sufficient to solubilize the water-insoluble organic compound in the water. Preferably, the amphiphile belongs to a class of compounds known as hydrotropes. |