| abstract |
The present invention relates to a chromogenic film and a pressure test film and a method for producing the same. The chromogenic film may include a substrate configured to form a chromogenic film by applying another layer thereon; a concavo-convex structure layer formed on the substrate; and microcapsules applied on the concave-convex structure layer and containing an electron-donating colorless dye precursor therein, wherein the electron-donating colorless dye precursor contacts an electron-accepting compound to form color. When the chromophoric film is under pressure, the concavo-convex structure layer compresses the chromophoric layer so that the microcapsules in the chromophoric layer are broken and the electron-donating colorless dye precursor is released. By using the concavo-convex structure layer, the color developing film can achieve reduction and concentration of the pressure resistance area of the pressure test film and the actual pressure resistance area of the microcapsule, so that even if a small pressure is applied to the pressure test film, the high sensitivity of the pressure test film can be obtained. can be achieved |