| 摘要 |
PURPOSE: Provided is a water-removable ink composition which shows substantially improved image stability and color generation effect after writing by using specific lubricant and dispersing and leveling agent. CONSTITUTION: The composition comprises 3-5 wt% of at least one electron-donating coloring agent selected from the group consisting of 2-anilino-6-dibutylamine-3-methylfluorane, 2-dibenzylamino-6-diethylaminofluoran, and 9-(diethylamino)spiro£12H-benzo£a|xantine- 1,2-isobenzofuran|-3, 6-8 wt% of gallic acid(3,4,5-oxybenzoic acid) which is an electron-accepting color-developing component, 40-45 wt% of methylethylketone which is a hydrophilic solvent, 0.5-1 wt% of triglyceride which is a lubricant, 2-4 wt% of polyoxyethylene lauryl ether which is a surfactant, 0.5-1 wt% of mixture of oleic acid, polyethylene glycol, stearic acid, polyoxyalkylene tristyrenated phenol, and polyoxyethylene-polyoxypropylene block copolymer, which is a dispersing and leveling agent, 5-7 wt% of 5% hydroxy propyl cellulose solution which is a binder, and the rest of at least one solvent selected from the group consisting of n-butylalcohol, n-propylalcohol, isopropylalcohol, and pentanol. |
