| 摘要 |
PURPOSE:To obtain a laminate reversibly changing from silver color to a colorless state by using a layer consisting of a silver metallic gloss pigment and a film forming material and adjusting the wavelength of reflected light as a first layer and employing a layer made of a thermal discoloring material, in which the lightness value of color concentration under the state of color developing and the brightness value of the colorless state under a decolored state have different characteristic values respectively, and the film forming material as a second layer. CONSTITUTION:A layer composed of a silver metallic gloss pigment, in which the optical thickness of a coating layer, in which the surface of natural mica is coated with 16-39wt.% titanium oxide, is 110-170nm and grain size is 5-100mum, and a film forming material and adjusting the wavelength of reflected light is used as a first layer 3. A layer made of a thermal discoloring material, which is made up of an electron donative compound, an electron acceptable compound and an organic compound medium reversibly generating both coloration reactions and in which the lightness value of color concentration under the state of color developing is six or less and the lightness value of a colorless state under a decolored state is eight or more, and the film forming material as a second layer 2. Accordingly, a thermal discoloring laminate thermally discoloring from silver to the colorless state reversibly can be obtained. |
