Toner

摘要

A toner having good development durability, storage stability, environmental stability, and low-temperature fixability is provided. The toner contains toner particles each including a surface layer that contains an organic silicon polymer. The organic silicon polymer contains a unit having a specific structure. The average thickness Dav. of the surface layers is a specific value and the silicon concentration determined by ESCA is 2.5% or more. The toner has a shape factor SF-2 of 140 or more and 260 or less and an average circularity of 0.970 or more and 0.990 or less.

主权项

1. A toner comprising:
toner particles each including a surface layer that contains an organic silicon polymer, the organic silicon polymer including a unit represented by formula (1) or (2) below:(In formula (2), L represents a methylene group, an ethylene group, or a phenylene group),
wherein, an average thickness Dav. of the surface layers measured by observation of cross sections of the toner particles with a transmission electron microscope is 5.0 nm or more and 150.0 nm or less, a silicon concentration determined by electron spectroscopy for chemical analysis performed on surfaces of the toner particles is 2.5 atomic % or more, the toner has a shape factor SF-2 of 140 or more and 260 or less, and the toner has an average circularity of 0.970 or more and 0.990 or less.