| US 7,608,378 B2 | ||
| Developing agent and method for manufacturing the same | ||
| Takashi Urabe, Sunto-gun (Japan); Tsuyoshi Ito, Izunokuni (Japan); Motonari Udo, Mishima (Japan); and Masahiro Ikuta, Mishima (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan); and Toshiba Tec Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jun. 02, 2006, as Appl. No. 11/445,865. | ||
| Prior Publication US 2007/0281240 A1, Dec. 06, 2007 | ||
| Int. Cl. G03G 9/00 (2006.01) | ||
| U.S. Cl. 430—137.14 [430/137.19] | 16 Claims |
| 1. A method for manufacturing a developing agent, comprising:
melt kneading and pulverizing a mixture containing at least a binder resin and a coloring agent to form a granulated mixture
having a first volume average particle size;
mixing the granulated mixture with an aqueous medium to form a mixed solution;
mechanically stirring the mixed solution to finely granulate said granulated mixture to form a fine particle having a second
volume average particle size small than the first volume average size; and
coagulating the fine particle to form a coagulated particle having a third volume average particle size smaller than the first
volume average size and larger than the second volume average particle size.
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