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1. (WO2017150122) TONER, TONER CONTAINING UNIT, AND IMAGE FORMING APPARATUS

Pub. No.:    WO/2017/150122    International Application No.:    PCT/JP2017/004659
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Fri Feb 10 00:59:59 CET 2017
IPC: G03G 9/08
Applicants: RICOH COMPANY, LTD.
株式会社リコー
KOJIMA, Satoshi
小島 智之
TAKAHASHI, Satoshi
高橋 聡
MORITANI, Tatsuru
森谷 樹
AOAI, Shosuke
青合 翔介
YAMAGUCHI, Tatsuki
山口 竜輝
Inventors: KOJIMA, Satoshi
小島 智之
TAKAHASHI, Satoshi
高橋 聡
MORITANI, Tatsuru
森谷 樹
AOAI, Shosuke
青合 翔介
YAMAGUCHI, Tatsuki
山口 竜輝
Title: TONER, TONER CONTAINING UNIT, AND IMAGE FORMING APPARATUS
Abstract:
A toner which contains toner mother particles and an external additive, and wherein: the toner mother particles contain a binder resin, a mold release agent and silica; the average abundance ratio (Xsurf) of the silica in near surface regions of the toner mother particles is 70% to 90%; and the average projected area S(180) per one toner particle when the toner is heated to 180°C and the average projected area S(30) per one toner particle when the toner is heated to 30°C satisfy formula (1). 1.4 ≤ S(180)/S(30) ≤ 1.7 formula (1)