Pelikan Produktions Ag

Daniel Loosli

Markus Schudel

Peter Drescher

Bruno Mancini

Description of an inkset for utilization in inkjet printers, comprising a first ink containing a watery ink medium, a first color pigment dispersed in the ink medium, and optionally, a first dispersing medium, whereby the first color pigment and/or the first dispersing medium carry ionic groups, a second ink containing a watery ink medium, a color substance soluble in the ink medium, whereby the soluble color substance acts as precipitation means for the first color pigment. A first ink containing a watery ink medium, a first color medium dispersed in the ink medium and optionally, a first dispersing medium, whereby the first color pigment and/or the first dispersing medium carry ionic groups, a second ink containing a watery ink medium and a second color pigment and/or, optionally, a second dispersing medium, whereby the second color medium and/or the second dispersing medium act as precipitation agent for the first color pigment. A first ink containing a watery ink medium, a first color pigment dispersed in the ink medium and optionally, a first dispersing medium, whereby the first color pigment and/or the first dispersing agent carry ionic groups, a second ink containing a watery ink medium and a water soluble, solvent-dissolved solvent color substance, optionally, with an emulsifier for this system, whereby the solvent color substance, the emulsifier and/or the water-insoluble act as precipitation agents for the first color pigments. These inks specifically reduce the bleeding at the contact lines of the different coloring during printing, and they have an adequate shelf life.

Ink set for utilization in inkjet printers

Description of an inkjet printing method, whereby a second and optionally a third and/or additional ink(s) is/are printed on top of each other or immediately next to each other, whereby (i) the first ink contains a coloring substance precipitable by a precipitation reagent, (ii) the first or the second ink contains the precipitation reagent in temporarily passivated form, and (iii) the first, second or third ink contains an activator for the temporarily passivated precipitation reagent, with the proviso that the temporarily passivated precipitation reagent and the activator are not present in the same ink. The method prevents or reduces the problem of mixing or running into each other of two inks at their border lines. The temporarily passivated precipitation agent can be a complexed multi-valent metal ion, which is displaced from the complex by the activator. The temporarily passivated precipitation reagent can also be a compound with pH-dependent ion strength which is activated by a proton-delivering or proton-accepting compound. The temporarily passivated precipitation reagent can also be a polyamine which is activated by protonizing or quaternizing.

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Bern, Switzerland

Daniel Loosli