| 摘要 |
PURPOSE:To obtain an innoxious reversible thermally discolorable composition having a sharp discoloring property, by dissolving or dispersing a specific substance in a vehicle. CONSTITUTION:Ferric salt of aliphatic monocarboxylic acid is used as a color former and monooxybenzoic acid or monooxylbenzoic ester are used as a coupler. On the basis of 100pts.wt. of a composition, 5-25pts.wt. of the color former, 5-25pts.wt. of the coupler, 2-30pts.wt. of a resin or polymer and 40-85 pts.wt. of a solvent are compounded. In preparing the composition, the color former and the coupler are at first heated, melted and mixed to form a uniform melt which is, in turn, cooled and finely divided to prepare a discoloring agent while the resin or polymer is added to the solvent or additives are added thereto and, if necessary, the resulting mixture is properly heated under stirring to prepare a uniform solution as a vehicle. Subsequently, the discoloring agent and, if necessary, white pigment are added to the vehicle and the obtained mixture is kneaded by a roll or a ball mill to obtain a uniform composition. |
