Patent ID: 6783580
Filing Date: 2004-08-31
Classification: B41J,C09D

Abstract:
An ink jet ink for thermal ink jet printers, wherein said printers employ a printhead having a nickel orifice plate through which droplets of said ink are expelled onto a print medium, said ink jet ink comprising:(a) a vehicle comprising (i) 5 to 10 wt % of a drying agent selected from the group consisting of 1,2-hexanediol and 1,2-pentanediol, (ii) 15 to 32 wt % 2-pyrrolidone, (iii) 15 to 37 wt % of at least one humectant, and (iv) the balance water; (b) 0.5 to 10 wt % of a dye; and (c) 0 to 3 wt % comprising at least one component selected from the group consisting of buffers, corrosion inhibitors, surfactants, biocides, polymers, and binders, with the proviso that the total amount of surfactants is 0.1 wt % or less, based on the total ink composition.