| 摘要 |
PURPOSE:To produce a color developer sheet for pressure-sensitive recording having a high initial color developing speed, favorable light resistance and favorable properties for coating, by forming a color developer for pressure-sensitive recording into uniform particulates. CONSTITUTION:An organic color developer is dissolved in an organic solvent, 0.2-50pts.wt. of a surface active agent and a water-soluble high molecular weight material are added to 100pts.wt. of the resultant solution, and the mixture is emulsified with addition of water to form color developer particles (minute droplets) having a particle diameter of 0.01-2mum. The emulsified liquid comprising the particles obtained by the emulsification is heated to remove the solvent. The emulsified liquid is heated with agitation so as to prevent coagulation or jointing of the minute droplets, thereby slowly distilling off the solvent. Upon the removal of the solvent, a slurry comprising the color developer is obtained, which is applied to a base. When the color developer sheet thus obtained is opposed to an upper-sheet paper coated with microcapsulses containing a color former and a load is exerted thereon by a calender roll to develop a color, the color is developed at a high speed. A color developer paper, either already subjected to color development or not yet subjected to color development, is free of after-yellowing or fading when being exposed to the solar rays for 4hr. Thus, a color developer sheet for pressure-sensitive recording having a high color developing speed and favorable light resistance is obtained. |
