Patent ID: 9423711
Filing Date: 2016-08-23
CPC Classification: G03G

Claim Text:
1. A magnetic toner comprising: magnetic toner particles comprising a binder resin, a magnetic body, and a release agent; and inorganic fine particles present on the surface of the magnetic toner particles, wherein; the inorganic fine particles present on the surface of the magnetic toner particles comprise metal oxide fine particles, the metal oxide fine particles containing silica fine particles, and optionally containing titania fine particles and alumina fine particles, and a content of the silica fine particles being at least 85 mass % with respect to a total mass of the silica fine particles, the titania fine particles and the alumina fine particles, wherein; when a coverage ratio A (%) is a coverage ratio of the magnetic toner particles' surface by the inorganic fine particles and a coverage ratio B (%) is a coverage ratio of the magnetic toner particles' surface by the inorganic fine particles that are fixed on the magnetic toner particles' surface, the magnetic toner has a coverage ratio A of at least 45.0% and not more than 70.0% and a ratio [coverage ratio B/coverage ratio A] of the coverage ratio B to the coverage ratio A of at least 0.50 and not more than 0.85, wherein the binder resin comprises a styrene resin, the release agent comprises a monoester compound or a diester compound, and wherein in measurement of the magnetic toner with a constant-load extrusion-type capillary rheometer, a softening temperature (Ts) is from at least 60.0° C. to not more than 75.0° C. and a softening point (Tm) is from at least 120.0° C. to not more than 150.0° C.