| 摘要 |
PURPOSE:To obtain the electrostatic charge image developer suitable for printed matter which is easily legible and prevents copying by incorporating a light reflecting material and transparent fine particles of 1 to 500mum grain size into this developer. CONSTITUTION:The light reflecting material 2 and the transparent fine particles 1 of 1 to 500mum grain size are incorporated into this developer. The image part of the printed matter obtd. by this developer is brightly visible even from a remote place as the incident light on the image part is retroreflected. The incident light 4 of the image part is retroreflected by the transparent fine particles 1 and light reflecting material 2 of the image part and the quantity of the reflected light arriving at a photosensitive body decreases when the printed matter formed by using such electrostatic charge image developer is going to be subjected to scanning type copying. The difference from the quantity of the reflected light in the background part by coloring carriers is eliminated and eventually, the image part and the non-image part are no longer discriminated and the copying is infeasible. The legible printed matter is obtd. in this way and the electrostatic charge image developer which prevents the copying of the printed matter is obtd. |
