| 摘要 |
<p>PURPOSE:To provide a coloring type indeliable ink reduced in its discoloration and fading caused by an acid, even when a dyestuff or pigment having low acid resistance is used. CONSTITUTION:The first composition produced by kneading a dyestuff, a maleic acid resin and a plasticizer is mixed and kneaded with the second composition produced by kneading a body pigment, a vehicle and a solvent to form the ink. In the kneading treatment of the first composition, the dyestuff is coated with the plasticized maleic acid resin, and in the mixing and kneading treatment of the second composition, the plasticizer is dispersed also in the vehicle, and the maleic acid resin is solidified and coated more strongly, thereby minimizing the discoloration and fading of the ink with acids.</p> |
