| US 7,494,758 B2 | ||
| Process for producing toner particles | ||
| Takeshi Tsujino, Toride (Japan); Satoshi Iki, Mishima (Japan); Yoshinori Tsuji, Shizuoka-ken (Japan); and Shinya Matsumura, Toride (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jan. 20, 2006, as Appl. No. 11/335,648. | ||
| Claims priority of application No. 2005-014974 (JP), filed on Jan. 24, 2005. | ||
| Prior Publication US 2006/0177759 A1, Aug. 10, 2006 | ||
| Int. Cl. G03G 9/08 (2006.01) | ||
| U.S. Cl. 430—137.15 [430/137.1] | 8 Claims |
| 1. A process for producing toner particles to be obtained by granulating in an aqueous medium a colorant composition containing
at least a colorant, wherein;
an apparatus which forms the toner particles by granulation has a granulation tank and a stirrer, and, where the internal
volume of the granulation tank is represented by A (L) and the volume of an air layer portion in the interior of the granulation
tank by B (L), the air layer portion proportion B/A satisfies the following expression (1):
0.05≧B/A (1), wherein the air layer portion of said liquid enclosure tank is pressurized, wherein gauge pressure C (kPa) at the time the
air layer portion of said liquid enclosure tank is pressurized satisfies the following expression (3):
100(kPa)≤C≤800(kPa) (3), wherein said stirrer is constituted of a rotating stirring blade and a stirring chamber and wherein in the step of granulation,
said stirring blade is rotated at a peripheral speed of 17 m/sec or more and 40 m/sec or less.
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