Patent ID: 7241333
Filing Date: 2007-07-10
Classification: B41J

Abstract:
1. An ink-jet ink comprising: water; a colorant; and a surfactant at a concentration higher than or equal to the critical micelle concentration of the surfactant, wherein the surface tension of the ink is not higher than or equal to the critical surface tension of a recording medium as an object for applying the ink, wherein the surface tension of the ink increases to a surface tension higher than or equal to the critical surface tension of the recording medium after contacting the recording medium, wherein the pH of the ink is higher than or equal to 6.5, and the surfactant is an anionic surfactant, and wherein the anionic surfactant has a cyclic peptide in its molecular structure, and the critical micelle concentration is lower than or equal to 0.0005 mol/L.