Durable outdoor inkjet inks

Abstract

An inkjet ink for printing durable outdoor images with an inkjet printer includes an basic pH aqueous ink vehicle comprising water, a soluble base, and at least one water soluble organic solvent; a pigment dispersion; and a polymer comprising base neutralized carboxylic acid groups with a glass transition temperature between 0 and 150° C. and an acid number between 50 and 1000 mg KOH/g dissolved in the vehicle, wherein the carboxylic acid groups are base neutralized; a poly-electrophilic functionalized compound capable of crosslinking the neutralized carboxylic acidic groups on the polymer wherein the ratio of the poly-electrophilic groups on the functionalized compound to carboxylic acid groups on the polymer is 1:1 or less on an equivalent basis and the ink maintains a stable viscosity and pigment particle size distribution for 6 weeks at 60° C.; the water in the ink inhibiting the crosslinking reaction until after the ink is printed and the water is substantially removed from the ink by drying.

Dependencies are inferred from the claim text.