| 摘要 |
PURPOSE:To obtain high electrostatic charging potential by subjecting a photoconductive plate to uniform electrostatic charging and image exposing to form an electrostatic latent image thereon and developing and fixing the image by using a powder toner having a dielectric constant in a specific range. CONSTITUTION:A powder toner having <=2.6 dielectric constant is used for the powder toner for developing an electrostatic latent image to a sensible image. Materials such as styrene, styrene/acryl alone or their copolymer, a polyester resin, epoxy resin, olefin resin, etc. are used as the binder resin of the toner and pigments such as carbon black, iron oxide powder etc. and dyes such as nigrosine, triphenyl amine, etc. are used as the coloring material thereof. The powder toner is so ground as to have 5-30 micron grain size after compounding and kneading. The materials, compounding ratio, production process, etc. are so selected as to provide <=2.6 dielectric constant. Flash fixing or pressure fixing with which thermal or mechanical denaturation arises hardly is executed as a method for fixing the toner image on ZnO photosensitive paper. A copied print having always satisfactory density of a practicable image is easily formed from the electronic printing master formed by the above-mentioned forming method. |
