Venable LLP
External additive, method for manufacturing external additive, and toner
Provided is an external additive having a resin particle containing a crystalline resin, and an inorganic fine particle containing a metal atom, the inorganic fine particle being embedded in the resin particle, wherein part of the inorganic fine particle being exposed on a surface of the resin particle, the maximum endothermic peak temperature of the external additive during a first temperature rise is from 50.0° C. to 120° C., the shape factor SF-2 of the external additive is from 110 to 150, and the external additive satisfies following formulae (1) and (2) below, in which Za (mass %) is the percentage content of a metal atom contained in the inorganic fine particle on the surface of the external additive in X-ray photoelectron spectroscopy, and Zb (mass %) is the percentage content of the metal atom in thermogravimetric analysis of the external additive, Za≥15  (1), andZa/Zb≥0.7  (2)
Canon Kabushiki Kaisha
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Shuhei Tatsuya Kazumichi Katsuhisa Shuntaro Hiroki Atsuhiko
Moribe Saeki Nakahama Yamazaki Watanabe Akiyama Ohmori