| abstract |
PROBLEM TO BE SOLVED: To suppress deterioration in developability even when used for a long time, and as a result, a two-component capable of forming a high-quality image having a high resolution and a sufficient image density for a long time. Providing developer. A two-component developer contains a carrier and a toner, and the carrier has a binder resin containing a phenol formaldehyde resin in which fine magnetic powder is dispersed. The coefficient SF-1 is 1.0 to 1.2, the shape factor SF-2 is 1.1 to 2.5, and the volume-based median diameter is 10 to 100 μm. It contains additive fine particles, the external additive fine particles contain a titanate compound and iron, and the iron content is 100 to 1,000 ppm with respect to the titanate compound. [Selection figure] None |