Patent ID: 8114562
Filing Date: 2012-02-14
Classification: G03G

Abstract:
1. A two-component developer, comprising: a yellow toner having yellow toner particles each having at least a binder resin and a colorant, and an external additive; and a magnetic carrier, (a) wherein the yellow toner has the following characteristics: (i) when a concentration of the yellow toner in a solution of the yellow toner in chloroform is represented by Cy (mg/ml) and an absorbance of the solution at a wavelength of 422 nm is represented by A422, a relationship between Cy and A422 satisfies the following expression (5) (ii) a lightness L* and a chroma C* of the yellow toner determined in a powder state satisfy relationships of 85.0≦L*≦95.0 and 100.0≦C*≦115.0; and (iii) an absolute value for a triboelectric charge quantity of the yellow toner measured by a two-component method using the yellow toner and the magnetic carrier is 50 mC/kg or more and 120 mC/kg or less, and (b) wherein the magnetic carrier comprises at least magnetic core particles and a resin component; a packed bulk density ρ1 (g/cm a specific resistance of each of the magnetic core particles of the magnetic carrier is 1.0×10 when a 50% particle diameter on a volume basis of the magnetic carrier is represented by D50, an average breaking strength P1 (MPa) of the magnetic carrier having a particle diameter of D50−5 μm or more and D50+5 μm or less and an average breaking strength P2 (MPa) of the magnetic carrier having a particle diameter of 10 μm or more and less than 20 μm satisfy a relationship of 0.50≦P2/P1≦1.10.