Patent ID: 9176402
Filing Date: 2015-11-03
Classification: G03G

Abstract:
1. A method for manufacturing a toner, the method comprising: (a) dissolving or dispersing a toner material comprising a binder resin, a precursor of a binder resin, or both, in an organic solvent; (b) dispersing a solution obtained in (a) in a first aqueous medium comprising a dispersant; (c) forming particles by removing the organic solvent from a solution obtained in (b); (d) washing the particles obtained in (c); (e) forming voids in the particles obtained in (d) by heating the particles to a temperature T while or after dispersing the particles in a second aqueous medium; (f) forming toner base particles by adding a charge controlling agent to a solution obtained in (e); and (g) adding an external additive to the toner base particles to obtain toner particles, wherein the temperature T in (e) is between a glass transition temperature Tg of the toner particles and Tg+25° C., and wherein the toner has a cross-sectional void fraction Sp/St of 0.1% to 15.0%, where St is a cross-sectional area of the toner particles, and Sp is a cross-sectional area of the voids.