Color image forming developer, color image forming method, and color image forming device
View Patent ↗The present invention provides a color image forming developer comprising yellow, magenta, and cyan toners each containing an infrared absorber, wherein the cyan toner has a maximum infrared absorbance in the infrared region lower than that of the magenta toner and that of the yellow toner, to simultaneously attain sufficient fixation capacity and sufficient resistance to void formation, and also provides an improved image forming method and an image forming device using the developer.
1. A color image forming developer comprising yellow, magenta, and cyan toners, said yellow, magenta, and cyan toners containing an infrared absorber, wherein the cyan toner has a maximum infrared absorbance lower than a maximum infrared absorbance of the magenta toner and a maximum infrared absorbance of the yellow toner, said maximum infrared absorbance is determined in a wavelength range of from 800 to 1100 nm, wherein the infrared absorber incorporated into the cyan, magenta, and yellow toners at the following content ratios as represented by the following formulae (1) and (2):
0.3 <Kc/Km <0.5 (1)
0.3 <Kc/Ky <0.5 (2)
wherein,
Kc: Content of an infrared absorber in the cyan toner, in parts by weight per 100 parts by
weight of the cyan toner,
Km: Content of an infrared absorber in the magenta toner, in parts by weight per 100 parts by
weight of the magenta toner, and
Ky: Content of an infrared absorber in the yellow toner, in parts by weight per 100 parts by weight of the yellow toner.
2. The color image forming developer according to claim 1 , wherein Kc ranges from 0.05 to 5, Km and Ky range from 0.1 to 5.
3. The color image forming developer according to claim 1 , wherein Kc ranges from 0.1 to 2, Km and Ky range from 0.2 to 2.
4. The color image forming developer according to claim 1 , wherein Kc ranges from 0.15 to 0.5, Km and Ky range from 0.4 to 1.
5. The color image forming developer according to claim 1 , wherein the infrared absorber is selected from the group consisting of a naphthalocyanine derivative, an aminium compound, and a diimonium compound.
6. The color image forming developer according to claim 1 , wherein the infrared absorber is used in combination, said combination selected from the group consisting of a naphthalocyanine derivative, an aminium compound and a diimonium compound.