Abstract
The various kinds of the toners and the carrier had been developed to fulfill the requirements of the developing system and the print quality. And the many kinds of the materials, such as Charge Control Agents, had bee developed to stabilize the tribo electric charging of the toners. On the other hand, the study on the design of the molecular weight distribution of the polymers and on the releasing agents had enable to apply the heat roll fusing system. And the energy consumption of the electrophotography had been decreased by the application of the novel polyester resins. The full color toners had been already developed in 1970's and the print quality of the electrophotography had been dramatically improved day by day. The electrophotography had become to be able to apply to “Print On Demand" applications and the remarkable growth will be expected today.
