Patent ID: 8431308
Filing Date: 2013-04-30
Classification: G03G

Abstract:
1. Toner for developing an electrostatic image, comprising: a core layer comprising a first binder resin, a colorant, and a releasing agent; and a shell layer covering the core layer and comprising a second binder resin, wherein the first binder resin comprises about 70 wt % or above of amorphous polyester resin and about 30 wt % or below of crystalline polyester resin, the second binder resin comprises an amorphous polyester resin, and a melting temperature (Tm(C)) of the crystalline polyester resin, a melting temperature (Tm(W)) of the releasing agent, and a melting point (Tm(T)) of the toner satisfy −20° C.≦Tm(W)−Tm(C)≦20° C., and 0° C.<Tm(C)−Tm(T)≦10° C., wherein a glass transition temperature (Tg(A)) of the amorphous polyester resin of the core layer and a glass transition temperature Tg(T)) of the toner satisfy 0° C.<Tg(A)−Tg(T)≦10° C., and wherein the melting temperature (Tm(C)) of the crystalline polyester resin and the melting point (Tm(W)) of the releasing agent satisfy 60° C.<Tm(C)<100° C., and 60° C.<Tm(W)<100° C.