| abstract |
A two-component developer that has excellent dot reproducibility, does not cause carrier adhesion, has high developability in various environments, has a sufficient image density, and can maintain these characteristics even with durability. To provide. In a two-component developer having a magnetic carrier in which a magnetic core is coated with a resin, and a toner, the magnetic core is selected from the group consisting of at least a ferrite component, and SiO 2 and Al 2 O 3. At least one oxide, the content of the oxide is 4.0 mass% or more and 40.0 mass% or less with respect to the magnetic core, and the specific resistance of the magnetic core is 1000 V / cm When applied, it is 5.0 × 10 4 Ω · cm or more and 5.0 × 10 8 Ω · cm or less, and the strength of magnetization of the magnetic carrier at 79.6 kA / m is 40.0 Am 2 / kg or more and 65.0 Am. 2 / kg or less, the residual magnetization after applying an external magnetic field of 79.6 kA / m is 3.0 Am 2 / kg or less, and the toner has a weight average particle diameter (D4) of 3.0 μm to 10.0 μm. In Ri, average circularity, two-component developer, wherein at 0.940 or more 0.990 or less. [Selection figure] None |