Inkjet ink with self-dispersed pigment

摘要

An ink composition for inkjet printing is disclosed herein. The ink composition includes a self-dispersed carbon black pigment with alkali metal counter ions, polyurethane, and an aqueous carrier. The aqueous carrier includes water, at least one water-soluble organic solvent, and at least one surfactant. In one embodiment, the aqueous carrier further includes an additive having a polar head group and a C8-C18 hydrocarbon tail.

主权项

1. An ink composition for inkjet printing, comprising:
a self-dispersed carbon black pigment with alkali metal counter ions in an amount ranging from about 1.0% to about 6.0% by weight based on the total weight of the ink composition, the alkali metal counter ions being a single cationic species selected from the group consisting of sodium cations, lithium cations, and potassium cations; polyurethane in an amount ranging from about 0.1% to about 3.0% by weight based on the total weight of the ink composition; and an aqueous carrier making up the balance, said aqueous carrier comprising water, at least one water-soluble organic solvent, at least one surfactant, and an anti-halo additive selected from the group consisting of oleic acid, elaidic acid, and linoleic acid, wherein the anti-halo additive is present in an amount ranging from about 0.05 to about 0.5% by weight based on the total weight of the ink composition; wherein the concentration of the alkali metal counter ions is in the range of 800-1800 ppm.