Patent ID: 9304422
Filing Date: 2016-04-05
CPC Classification: G03G

Claim Text:
1. Magnetic toner comprising magnetic toner particles each containing a binder resin, a magnetic material and a releasing agent, and silica fine particles present on the surfaces of the magnetic toner particles, wherein the silica fine particles comprise silica fine particles A and silica fine particles B, the silica fine particles A have a number-average particle size (D1) of 5 nm or larger and 20 nm or smaller as primary particles, the silica fine particles B are produced by a sol-gel method, and have a number-average particle size (D1) of 40 nm or larger and 200 nm or smaller as primary particles, an abundance ratio of secondary particles of the silica fine particles B is 5% by number or more and 40% by number or less, and a coverage ratio X1 of the surface of the magnetic toner particles with the silica fine particles determined by electron spectroscopy for chemical analysis (ESCA) is 40.0% by area or more and 75.0% by area or less.