| 摘要 |
PURPOSE: An electro-photographic toner, an invisible toner, a developer for an electro-photography using thereof, a toner cartridge, a process cartridge, and an image forming apparatus are provided to secure the light-proof property and the light absorbance at the near-infrared light wavelength area of 750~1,000nm. CONSTITUTION: An invisible toner for an electro-photography contains an infrared ray absorber and a binder resin. The infrared ray absorber is a perimidine-based squarylium pigment marked with chemical formula 1. The median diameter of the perimidine-based squarylium pigment is 80~200 nanometers. The perimidine-based squarylium pigment has 16% volume particle diameter of over 40 nanometers, and 84% volume particle diameter of less than 300 nanometers.
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