Eastman Kodak Company
Method of inkjet printing

Abstract:

An inkjet printing method uses an aqueous inkjet ink composition having a non-crosslinked, crosslinkable polyurethane having an acid number of 20-40 and is derived from an aromatic diisocyanate; and a diol mixture of D.sub.1 and D.sub.2 diols, and optionally including D.sub.3 diol, D.sub.4 diol, or both D.sub.3 and D.sub.4 diols. D.sub.1 has a C.sub.3 to C.sub.7 aliphatic group and a pendant carboxy group or neutralized carboxy group. D.sub.2 has a chain of repeating C.sub.2 to C.sub.6 alkylene oxide groups. D.sub.3 is an alkoxylated bisphenol A or aliphatic cyclic diol, present at least 5 mol %. D.sub.4 is a hydroxy-terminated polybutadiene having a molecular weight of at least 1000 and is present in an amount of 0.1-5 mol %. The ink composition also contains a dispersed pigment colorant; a humectant or organic co-solvent, and optionally, a crosslinking agent.