Patent ID: 9213250
Filing Date: 2015-12-15
Classification: G03G

Abstract:
1. A toner comprising toner particles, each of which contains a binder resin and a colorant, and silica fine particles, wherein the toner has an average circularity of at least 0.950, the toner has a static friction coefficient, with respect to a polycarbonate resin substrate, of at least 0.100 and not more than 0.200, a coverage ratio Xl of the toner surface by the silica fine particles, as determined by X-ray photoelectron spectroscopy (ESCA), is at least 50.0 area % and not more than 75.0 area %, and when a theoretical coverage ratio of the toner by the silica fine particles is X2, the diffusion index defined in Formula 1 below satisfies Formula 2 below: