| 摘要 |
PURPOSE:To enhance smoothness of a color developer sheet, prevent smudging and obtain a color developer sheet for an image-recording material having excellent printability, by incorporating an inorganic color developer and an acrylic latex into a coated layer. CONSTITUTION:The color developer sheet comprises an electron-donative colorless dye and an electron-acceptive color developer. The coated layer comprises a semisynthetic solid acid as an inorganic color developer and an acrylic latex as a binder. The inorganic color developer is derived from a clay mineral having a lamellar structure constituted of regular tetrahedrons of silica, and shows an electron diffraction pattern characteristic of crystals having said lamellar structure. the latex has a minimum film-forming temperature of not higher than +45 deg.C. Accordingly, the color developer sheet has high smoothness, possibility of smudging becomes extremely low, while developed color density is high, and the density is not lowered under a high-humidity condition. |
