INK COMPOSITION FOR INK JET

摘要

A non-erasable ink-jet ink composition is disclosed that comprises the admixture of (1) an aqueous colored polyurethane dispersion that is the reaction product of (a) a colored urethane prepolymer that is the catalyzed reaction product of at least one polyol; at least one polyisocyanate; at least one internal surfactant; and at least one reactive colorant; (b) at least one neutralizing agent; (c) an aqueous dispersing medium; and (d) at least one chain extender wherein the ratio of internal surfactant to polyol and the ratio of NCO groups to total OH groups are predetermined ratios; (2) at least one plasticizer; (3) an aqueous medium; and (4) at least one humectant, wherein the ink composition has a jettably viscosity from about 1 to about 20 centipoise at about 10 DEG C to about 45 DEG C.