| 摘要 |
PURPOSE:To obtain a color developing sheet for pressure-sensitive copy paper generating no yellowing due to light and gas such as nitrogen oxide in air, imparting a color image stable against light and a plasticizer and generating no lowering in developed color density and having good water resistance, by having a metallized substance of a copolycondensation resin consisting of salicylic acid and alpha,alpha'-dialkoxy-p-xylene contained as a developer. CONSTITUTION:A copolycondensation resin consisting of salicylic acid and alpha,alpha'-dialkoxy-p-xylene is obtained by reacting salicylic acid with alpha,alpha'-dialkoxy-p- xylene at 110 deg.C or more in the presence of an acid catalyst without almost generating corresponding side-reaction such as esterification reaction. A metallized substance of this salicylic acid copolycondensation resin is prepared by reacting an alkali metal salt of this resin and a water-soluble multivalent metal salt in water or in a solvent capable of dissolving both components. As the metal of the metallized substance, zinc is especially effective. As a method for preparing a color developing sheet for pressure-sensitive copy paper, there is the developer coating method or a method for internally adding the coupler in a paper stock during a papermaking process. |
