Inkjet ink with polyurethane additive derived from alkoxy aromatic diols inks

摘要

The invention provides an ink for inkjet printing, comprising colorant and certain polyurethane ink additives which is derived from alkoxy aromatic diol derived from alkoxy aromatic diols which enhances fastness of the print towards highlighter and finger smudge without compromising jetting performance and storage stability of the ink. The inks may be jetted from both thermal and piezo ink jet systems.

主权项

1. An aqueous inkjet ink composition comprising:
(a) a colorant; (b) an aqueous vehicle; and (c) a first polyurethane additive comprising an alkoxy aromatic diol, a diol substituted with an ionic group, and isocyanates wherein the alkoxy aromatic diol is Z1 wherein Ar is an aromatic group,n, m, p, and q are integers,n, m are the same or different and are greater than or equal to 2 to 12,p is greater than or equal to 1 to 15,q is greater than or equal to 0 to 15,R1, R2 are the same or different and each is independently selected from the group consisting of hydrogen, methyl, ethyl and higher alkyls of the formula of CtH2t+1; where t is an integer and is greater than or equal to 3 to 36, Z2 is a diol substituted with an ionic group; and at least one Z1 and at least one Z2 must be present in the first polyurethane additive.