Patent ID: 8685604
Filing Date: 2014-04-01
Classification: G03G

Abstract:
1. A toner, comprising: a colorant; and a first binder resin, wherein the first binder resin is a block copolymer of a polyester backbone A having a repeating unit obtained from a dehydration condensation of a hydroxycarboxylic acid with another backbone B having no repeating unit obtained from a dehydration condensation of a hydroxycarboxylic acid; wherein the first binder resin has first and second glass transition points at a temperature Tg1 of −20 to 20° C. and a temperature Tg2 of 35 to 65° C., respectively, measured by a differential scanning calorimeter at a heating rate of 5° C./min, wherein a ratio h1/h2 of a baseline displacement h1 observed in the first glass transition point to a baseline displacement h2 observed in the second glass transition point is less than 1.0, and wherein the first binder resin has a structure in which a first phase is dispersed in a second phase, the first and second phases consisting of portions having larger and smaller phase difference values, respectively, than an intermediate value between maximum and minimum phase difference values in a binarized phase image obtained by an atomic force microscope with a tapping mode method.