| US 7,556,904 B2 | ||
| Toner for electrostatic development, developer, image forming method, image-forming apparatus and process for cartridge using the same | ||
| Takuya Kadota, Kobe (Japan); Masahide Inoue, Katsuragi (Japan); Yoshihiro Mikuriya, Nishinomiya (Japan); Katsunori Kurose, Takarazuka (Japan); Masayuki Hagi, Minoo (Japan); Minoru Nakamura, Takarazuka (Japan); Hiroaki Kato, Nagaokakyo (Japan); Atsushi Yamamoto, Kawanishi (Japan); and Hideaki Yasunaga, Ibaraki (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Apr. 26, 2006, as Appl. No. 11/411,179. | ||
| Claims priority of application No. 2005-130691 (JP), filed on Apr. 28, 2005. | ||
| Prior Publication US 2006/0275686 A1, Dec. 07, 2006 | ||
| Int. Cl. G03G 9/08 (2006.01) | ||
| U.S. Cl. 430—108.1 [430/108.24; 430/108.6; 430/108.7] | 17 Claims |
| 1. A toner comprising:
toner particles; and
inorganic fine particles,
wherein the inorganic fine particles are externally added to the toner particles which comprise a binder resin and a colorant,
and
wherein the inorganic fine particles comprise forsterite having a relative permittivity measured at 1 MHz of 2 to 10 and a
volume resistivity of 1011Ω·cm or more.
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