| US 7,547,497 B2 | ||
| Toner, and developer, image developer and image forming apparatus using the toner | ||
| Osamu Uchinokura, Numazu (Japan); Masami Tomita, Numazu (Japan); Hisashi Nakajima, Numazu (Japan); Shinya Nakayama, Numazu (Japan); Koichi Sakata, Numazu (Japan); Akihiro Kotsugai, Numazu (Japan); Tomoyuki Ichikawa, Kawasaki (Japan); Yasuo Asahina, Numazu (Japan); Hideki Sugiura, Fuji (Japan); Yasuaki Iwamoto, Numazu (Japan); and Satoshi Mochizuki, Numazu (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Mar. 16, 2005, as Appl. No. 11/80,542. | ||
| Claims priority of application No. 2004-073823 (JP), filed on Mar. 16, 2004. | ||
| Prior Publication US 2005/0208408 A1, Sep. 22, 2005 | ||
| Int. Cl. G03G 9/087 (2006.01) | ||
| U.S. Cl. 430—108.2 [430/108.22; 430/108.4; 430/113.3; 430/137.3] | 11 Claims |
| 1. A toner which is negatively charged comprising:
a colorant; and
a binder resin,
wherein the toner has an acid value of from 5 to 20 mg KOH/g and an amine value of from 0.5 to 10 mg KOH/g,
wherein the toner is prepared by a method comprising:
dissolving or dispersing toner constituents comprising a resin component comprising at least one of a polymerizing monomer
and a binder resin, and a tertiary amine compound, in an organic solvent to prepare a solution or a dispersion, wherein the
tertiary amine compound has the following formula (I):
 dispersing the solution or the dispersion in an aqueous medium.
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