US 7,320,850 B2 | ||
Magenta toner | ||
Takayuki Itakura, Shizuoka (Japan); Yuko Sato, Shizuoka (Japan); Hiroyuki Fujikawa, Kanagawa (Japan); Nobuyoshi Sugahara, Shizuoka (Japan); and Hirohide Tanikawa, Shizuoka (Japan) | ||
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
Filed on Jul. 14, 2004, as Appl. No. 10/890,165. | ||
Claims priority of application No. 2003-196708 (JP), filed on Jul. 14, 2003; and application No. 2003-389755 (JP), filed on Nov. 19, 2003. | ||
Prior Publication US 2005/0014079 A1, Jan. 20, 2005 | ||
Int. Cl. G03G 9/08 (2006.01) |
U.S. Cl. 430—108.3 [430/108.8; 430/109.3; 430/109.4; 430/111.4] | 14 Claims |
1. A magenta toner comprising magenta toner particles which comprises at least a binder resin, a colorant, and a wax, wherein:
the magenta toner has one or plural heat-absorption peaks in a temperature range of 30 to 200° C. in a heat-absorption curve
obtained using a differential scanning calorimeter, and a maximum value of a maximum heat-absorption peak in the one or plural
heat-absorption peaks is in a range of 65 to 105° C.;
the magenta toner when measured in a powder form by spectroscopic analysis has a reflectance of 15 to 45% at a wavelength
of 480 nm and a reflectance of 65 to 90% at a wavelength of 630 nm;
the magenta toner when measured in a powder form has a lightness L* of 45 to 75; and
the colorant (a) is present in amounts from 0.2 to 1.8 parts by weight per 100 parts by weight of the binder resin and (b)
comprises 70% by number or more of particles having particle sizes of 0.05 to 0.5 μm with respect to total colorant.
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