TONER FOR NONMAGNETIC ONE-COMPONENT DEVELOPMENT

摘要

PURPOSE: To obtain a toner used in a nonmagnetic one-component developing system in which a developing roll for developing an electrostatic charge image and an electrostatic latent image carrier (photoreceptor) are kept in contact with each other and not causing the fusion of the toner to the developing roll, etc. CONSTITUTION: This toner is a toner used in a reversal developing system mounted with a developing device with at least a developing roll for carrying and transferring a toner and a member regulating the thickness of a toner layer disposed in press contact with the developing roll and further mounted with an electrostatic latent image carrier having positive electrification ability disposed in contact with the developing roll. The toner has 8.0-13.0μm vol. average particle diameter (D50 ) and 1.0-2.2m<2> /g specific surface area (S) measured by a BET multipoint method (nitrogen adsorption method) and satisfies 12.0<=K×D50×S<=20.0 (K is the true specific gravity of the toner).