US Patent 7217488 Toner comprising core layer and shell layer

A toner comprising: a core layer and a shell layer formed on the core layer,wherein the core layer and the shell layer respectively comprise a first wax and a second wax; the second wax having a melting point that is higher than a melting point of the first wax;the first wax having an average dispersion diameter that is smaller than the average dispersion diameter of the second wax; andthe first wax having a content in the core layer that is greater than a content of the second wax in the shell layer.