Patent ID: 7722179

Claim:
An inkjet fixer composition, comprising: a) an aqueous ink vehicle including at least two co-solvents including from 5 to 20 weight percent of 4-methylmorpholine-N-oxide titrated to a pH of 4-6 with methanesulfonic acid and from 6 to 12 weight percent of trimethylolpropane; b) from 1 to 2 weight percent of at least one polyamine polycation; c) from 0 to 0.1 weight percent carboxybenzotriazole; and d) from 0 to 0.4 weight percent non-ionic fluorosurfactant and from 0 to 0.5% non-ionic acetylenic diol-based surfactant; wherein the fixer composition is slow penetrating into a substrate; and wherein the fixer composition underprints an ink-jet ink on the substrate, the ink-jet ink comprising: a) an aqueous liquid vehicle; and b) a colorant; wherein the fixer composition vehicle and the ink-jet ink vehicle form a vehicle mixture on the substrate after which the vehicle mixture penetrates into the substrate, and an ink image is formed on the substrate.