WATER-BASED INK, METHOD FOR PRODUCING WATER-BASED INK, INK VESSEL, AND INK-JET PRINTER

摘要

PROBLEM TO BE SOLVED: To provide a water-based ink by which water and oil repellent film applied on a nozzle surface cannot be easily destroyed, a method for producing the water-based ink, an ink vessel, and an ink-jet printer.;SOLUTION: The water-based ink is produced by mixing in the predetermined amounts of at least 1 type of dye wherein slope K satisfies a condition of K=-dpH/d [amount of addition (ppm) of sulfuric acid] ≥0.01 in a neutralization curve obtained by addition of sulfuric acid to a 1 wt.% dye aqueous solution wherein all dyes as coloring materials have been dissolved, at least 1 type of liquid medium into which dyes are dissolved, at least 1 type of surfactant, and at least 1 type of acid for neutralizing excessive alkaline components contained in dyes so as to adjust pH.;COPYRIGHT: (C)2006,JPO&NCIPI