Importance

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Abstract

To provide a toner that is less likely to cause image defects due to the detachment of the silica aggregated particle even when having been used for a long period of time in a low-temperature and low-humidity environment. The toner includes: a toner particle containing a binder resin; and a silica aggregated particle, wherein, in TOF-SIMS measurement of the toner particle, a fragment peak derived from a boron atom and a fragment peak derived from a boron-oxygen structure are detected; the silica aggregated particle is an aggregated particle of silica fine particles having a primary particle size based on number of from 20 to 75 nm, a maximum Feret's diameter of the silica aggregated particle is from 110 to 500 nm, and an aspect ratio thereof is from 1.50 to 4.00.

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First Claim