AMPHOTERIC POYURETHANE DISPERSANTS AND THEIR USE IN INKJET INKS

摘要

The disclosure provides an aqueous dispersion comprising a colorant and an amphoteric polyurethane dispersant, wherein the amphoteric polyurethane dispersant comprises a reaction product of at least one basic amine urethane monomer, at least one acidic urethane monomer, and at least one urethane monomer comprising two or more isocyanates. The disclosure further provides an ink jet ink comprising this aqueous dispersion, a method of printing using this ink jet ink and a printer comprising this ink jet ink. The ink jet inks comprising these dispersions have improved bleed control, and optical density/chroma, especially with treated papers such as Colorlok® or in the presence of a second ink having a reactive species.