| 摘要 |
PURPOSE: Provided is a toner comprising a binder resin comprising a polyester unit, a colorant, a releasing agent and inorganic fine particles and a two-component developer comprising the toner and a magnetic carrier comprising magnetic core particles coated by a coating layer and having a number average particle diameter of 15-80 μm, wherein a high-quality image is formed at a high speed even in an oilless fixing system by using the toner and the two-component developer. CONSTITUTION: The toner comprises toner particles each comprising at least a binder resin, a colorant and a releasing agent, and inorganic fine particles, wherein the binder resin comprises at least a polyester unit; a weight average particle diameter of the toner is in a range of 3.0 to 6.5 μm; an average circularity of particles in the toner each having a circle-equivalent diameter of 2 μm or more is in a range of 0.920 to 0.945; a BET specific surface area of the toner is in a range of 2.1 to 3.5 m¬2/g; and a permeability of light of a wavelength of 600 nm in a liquid prepared by dispersing the toner in a 45 vol.% aqueous solution of methanol is in a range of 30 to 80%. The two-component developer comprises a toner and a magnetic carrier, wherein the toner comprises toner particles each comprising at least a binder resin, a colorant and a releasing agent, and inorganic fine particles; the binder resin comprises at least a polyester unit; a weight average particle diameter of the toner is in a range of 3.0 to 6.5 μm; an average circularity of particles in the toner each having a circle-equivalent diameter of 2 μm or more is in a range of 0.920 to 0.945; a BET specific surface area of the toner is in a range of 2.1 to 3.5 m¬2/g; a permeability of light of a wavelength of 600 nm in a liquid prepared by dispersing the toner in a 45 vol.% aqueous solution of methanol is in a range of 30 to 80%; and the magnetic carrier comprises magnetic core particles comprising a magnetic material, and a coating layer formed on surfaces of the magnetic core particles by using a resin, and a number average particle diameter of the magnetic carrier is in a range of 15 to 80 μm.
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