Patent ID: 7531281
Filing Date: 2009-05-12
Classification: G03G

Abstract:
1. A double-component developer comprising: a base of toner particle; and a magnetic resin carrier, wherein the base of toner particle comprises a modified polyester resin (i) as a toner binder resin, wherein a plurality of the base of toner particle has a volume average particle diameter (Dv) of 3 μm to 7 μm, a ratio (Dv/Dn) of the volume average particle diameter (Dv) to a number average particle diameter (Dn) is 1.01 to 1.25, a plurality of the base of toner particle comprises 15% by number or less of the base of toner particle having a particle diameter of 0.6 μm to 2.0 μm, and a plurality of the base of toner particle has a circularity of 0.94 to 0.99 on average.