| 摘要 |
<p>PURPOSE:To obtain the title ink having excellent consistency of color feeling of external appearance of ink and a feeling of actual color written on paper, comprising water, an organic solvent having compatibility with water, a specific fluorescent coloring material and a thickening agent. CONSTITUTION:The objective ink comprising at least water, an organic solvent such as ethylene glycol, having compatibility with water, a fluorescent coloring material prepared by dyeing a water dispersion of polymer fine particles having 0.1-1.0mum average particle diameter prepared by emulsion polymerization with cationic dye or fluorescent brightener or both and preferably 0.5-1.2wt.% xanthan gum in order to prevent precipitation of fluorescent coloring material in ink for a long period of time.</p> |
