| 摘要 |
PURPOSE:To improve the light proof and the moisture resistance of a colored picture, which are the defects of inorganic developer by incorporating a compound, which is obtained by the esterifying reaction of rosin glycidyl ester and specified hydroxybenzoic acid, and water glass into the inorganic developer layer. CONSTITUTION:A developer sheet for pressure sensitive recording has an electron accepting inorganic developer layer, which is colored in contact with electron donative coloring agent. At this time, the compound, which is obtained by the esterifying reaction of rosin glycidyl ester and a plurality of specified components is in corportated in the inorganic developer layer. A plurality of the specified components are expressed by the chemical formulas. At least one kind is used among salicylic acid or substituted salicylic acids, parahydroxybenzoic acid or substituted parahydroxybenzoic acid, other salicylic acid or substituted salicylic acid and formalin condensates. The inorganic developer layer incorporates water glass. Thus, the light proof and the moisture resistance of the colored picture, which are the defects of the inorganic developer, are improved. |
