| 摘要 |
<p>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.</p> |
