Abstract: The ink set of this invention comprises at least two inks, one of which contains a pH sensitive polymer, a glycol ether, and preferably a self-dispersing pigment colorant. A second ink is provided which comprises incompatible inorganic or organic salts or has an appropriate pH. The polymer precipitates onto a medium upon contact with the second ink, thereby providing improved dry time as well as bleed and halo control.

Abstract: The ink set of this invention comprises at least two inks, one of which contains a pH sensitive polymer, a glycol ether, and preferably a self-dispersing pigment colorant. A second ink is provided which comprises incompatible inorganic or organic salts or has an appropriate pH. The polymer precipitates onto a medium upon contact with the second ink, thereby providing improved dry time as well as bleed and halo control.

Abstract: The ink set of this invention comprises at least two inks, one of which contains a pH sensitive polymer and preferably a self-dispersing pigment colorant. A second ink is provided which comprises incompatible inorganic or organic salts or has an appropriate pH. The polymer precipitates onto a medium upon contact with the second ink, thereby providing improved bleed and halo control.

Abstract: The ink set of this invention comprises at least two inks, one of which contains a pH sensitive polymer and preferably a self-dispersing pigment colorant. A second ink is provided which comprises incompatible inorganic or organic salts or has an appropriate pH. The polymer precipitates onto a medium upon contact with the second ink, thereby providing improved bleed and halo control.

Abstract: The ink of the invention comprises a vehicle and a macromolecular chromophore colorant. The colorant is a water-insoluble pigment that has been chemically modified to be water dispersible by addition of functional groups to the surface of the pigment resulting in water dispersible colorant particles. The performance of these pigments is improved by the addition of specific functional groups which provide improved black to color bleed control and high waterfastness.

Abstract: A pigment-based ink composition is provided which employs a pigment precursor that is soluble in a non-aqueous solvent. Preferably, the ink composition is in the form of an aqueous, two-phase system wherein the pigment precursor is solubilized in a high boiling, water-insoluble organic compound. Optionally, a second high boiling compound miscible with both aqueous and organic phases and at least one amphiphile are also present.

Abstract: An aqueous microemulsion-based ink-jet ink composition is provided which employs a second organic solvent that is miscible with both the discontinuous and the continuous phase. Specifically, the ink-jet ink composition of the present invention comprises at least one dye; and a microemulsion comprising at least one high boiling water-insoluble organic compound, at least a second high boiling compound miscible with both aqueous and organic phases, at least one amphiphile, and water, wherein the amphiphile is present in an amount sufficient to solubilize the water-insoluble organic compound.

Abstract: Bleed control and fast dry times are achieved in aqueous pigment dispersion-based ink-jet ink compositions by formulating the ink compositions to comprise at least one aqueous pigment dispersion and a microemulsion comprising at least one water-insoluble organic compound, at least one hydrotropic amphiphile, and water. The hydrotropic amphiphile is present in the microemulsion in an amount sufficient to solubilize the water-insoluble organic compound.

Abstract: The formation of mill scale contaminated with an appreciable amount of oily substances is prevented by spraying rolled steel with an aqueous stream under high pressure containing an effective amount of a surfactant.