Ink set for reducing printhead corrosion
View Patent ↗An ink set for an inkjet printer. The ink set includes an aqueous first ink comprising a first colorant and absent any potassium ions; and an aqueous second ink comprising a second colorant and potassium ions. The second aqueous ink comprises an AI(III) additive in an amount greater than the first ink.
1. An ink set for an inkjet printer, the ink set comprising:
an aqueous first ink comprising a first colorant and absent any potassium ions; and
an aqueous second ink comprising a second colorant and potassium ions,
wherein the second aqueous ink comprises an AI(III) additive in an amount greater 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 AI(III) additive in an amount ranging from 0.01 to 200 ppm.