Inkjet printer having printhead and ink for minimizing corrosion of exposed corrodible structures within printhead
View Patent ↗An Inkjet printer includes: an inkjet printhead having an exposed corrodible structure containing silicon nitride, borophosphosilicate glass (BPSG) or silicon oxide; and an ink reservoir containing said ink which is in fluid communication with said printhead. The ink includes: water; a dye; and a metal additive for minimizing corrosion of the exposed structure.
1. An ink set for an inkjet printer, the ink set comprising different colored aqueous inks having different concentrations of potassium ions, wherein:
a first ink comprising a first colorant contains a relatively lower concentration of potassium ions than a second ink comprising a second colorant; and
the second ink contains an Al(III) additive in higher concentration than the first ink.
2. The ink set of claim 1 , wherein the second colorant is an azo dye having sulfonate groups.
3. The ink set of claim 1 , wherein the printer comprises a printhead having exposed corrodible structures.
4. The ink set of claim 2 , wherein the exposed corrodible structures are selected from the group consisting of: silicon nitride, borophosphosilicate glass (BPSG) and silicon oxide.
5. The ink set of claim 1 , wherein the second ink contains the Al(III) additive in an amount ranging from 0.01 to 200 ppm.
6. The ink set of claim 1 , wherein the first ink does not contain any Al(III) additive.