Aqueous ink jet ink comprising a crosslinking pigment dispersion based on diblock polymeric dispersants

摘要

The present disclosure provides an aqueous ink jet ink comprising an ink vehicle and an aqueous dispersion, wherein the aqueous dispersion comprises a solid particle and a polymeric dispersant that has been crosslinked, wherein the polymeric dispersant is a block copolymer comprising an A block and a B block, wherein the A block is a segment having a block size of about 5 to about 18 units, and comprises at least 50% by weight of a monomer, having the following structure: CH₂═CRC(O)O(CHR₁CH₂O)nR₂; wherein R and R₁ are H, or methyl; R₂ is alkyl of 1-4 carbon atoms or phenyl; and n is about 1 about 20; and the B block is a segment comprising an ionic monomer and at least one hydrophobic monomer; and wherein the dispersant comprises a crosslinkable moiety; wherein the crosslinkable moiety is crosslinked with a crosslinking agent selected from the group consisting of epoxide, carbodiimide, oxazoline, isocyanate, and silane; and wherein the aqueous dispersion has a pH of at least about 8.0. The disclosure further pertains to a printer comprising the aqueous ink jet ink of this disclosure that provides images with the requisite optical density and chroma needed for emerging ink jet applications.