toner

Abstract

To provide a toner that has reduced the occurrence of drop-off and streaks even after a long-term printing in a high temperature and high humidity environment.SOLUTION: A toner contains a toner particle containing a polyester resin and silica fine particles. In measurement in time-of-flight secondary ion mass spectroscopy of the silica fine particles, fragment ions corresponding to the D-unit structure are observed. When the silica fine particles are dispersed in a mixed solution of ethanol and a NaCl solution and a titration operation using sodium hydroxide is performed, a titration amount falls within a specific range. In solid 29Si-NMR measurement of the silica fine particles, when the area of a peak where a peak top is present within a range from -25 to -15 ppm is defined as D, and the area of a peak where a peak top is present within a range exceeding -19 ppm and -17 ppm or less is defined as D1, the specific surface area of the silica fine particles, D, and D1 are present in a specific relationship. The polyester resin is present on the surface of the toner particle.SELECTED DRAWING: None

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