MAGNETIC TONER

摘要

A magnetic toner containing: magnetic toner particles containing a binder resin and a magnetic body; 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 contain silica fine particles and alumina fine particles and/or titania fine particles; a coverage ratio A of the magnetic toner particles' surface by the inorganic fine particles each of which has a particle diameter of from 5 nm to not more than 50 nm and a coverage ratio B of the magnetic toner particles' surface by the inorganic fine particles each of which has a particle diameter of from at least 5 nm to not more than 50 nm and is fixed to the magnetic toner particles' surface, have prescribed values and a prescribed relationship in the magnetic toner; and alumina fine particles and/or titania fine particles each of which has a particle diameter of from at least 100 nm to not more than 800 nm is present on the surface of the magnetic toner particles at from at least 1 particle to not more than 150 particles, as the sum of the two, per magnetic toner particle.

主权项

1. A magnetic toner comprising:
magnetic toner particles comprising a binder resin and a magnetic body; 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 silica fine particles and at least one of alumina fine particles and titania fine particles, wherein; when a coverage ratio A (%) is a coverage ratio of the magnetic toner particles' surface by the inorganic fine particles each of which has a particle diameter of from at least 5 nm to not more than 50 nm and a coverage ratio B (%) is a coverage ratio of the magnetic toner particles' surface by the inorganic fine particles each of which has a particle diameter of from at least 5 nm to not more than 50 nm and is fixed to 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, and wherein at least one of the alumina fine particles and the titania fine particles each of which has a particle diameter of from at least 100 nm to not more than 800 nm is present on the surface of magnetic toner particles at from at least 1 particle to not more than 150 particles, as the total number of the alumina fine particles and the titania fine particles, per magnetic toner particle.