| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain the subject product hardly causing the clogging of ink jet printers due to the dryness of the ink, not generating the coagulation and precipitation of the ink over a long period, capable of being stably extruded, and excellent in water resistance, light resistance and the like by combining the polymer of a flavonoid and/or an indole quinone with an organic pigment in a specific ratio. SOLUTION: This ink contains (A) 0.1-10% of the polymer of a flavonoid (preferably a catechin derivative or the like) and/or an indole quinone (preferably melamine) and (B) 0.5-20% of an organic pigment. A surfactant and/or a water-soluble resin may combinedly be used as dispersion auxiliaries for the component B in the objective product. On the preparation of the objective product, it is preferable to remove coarse particles. For example, the product not causing the clogging of printers is obtained by filtering a compounded ink with a pressure filtration machine using a 1μm filter to remove particles having sizes of >=1μm.</p> |
