Patent ID: 7455946
Filing Date: 2008-11-25
Classification: G03G

Abstract:
1. A two-component developing agent used in an image forming device having a magnetic roller, a development roller, a photosensitive drum for retaining an electrostatic latent image on the periphery surface thereof, the two-component developing agent comprising: the nonmagnetic toner having color particles and a surface treatment agent, the containing ratio of the color particles having a particle diameter of 2.0 μm or less is 10% or less with respect to the total number, and the average degree of circularity of the color particles being 0.925 or greater, the nonmagnetic toner being used by causing an additive agent to adhere to the surface of the color particles, the magnetic carrier having magnetic particles and a resin coating layer provided on the surface thereof, and the critical surface tension of the resin coating layer being 25 dyn/cm or less.