| 摘要 |
PURPOSE:To form images of good image quality which are free from fogging stably over many times by incorporating a carrier consisting of magnetic material particles essentially consisting of copper, zinc and iron, a toner contg. a styrene/acrylic copolymer of <=2 acid value and a carbon black treated with an amino-modified silicone oil into the above developer. CONSTITUTION:This developer contains the carrier consisting of the magnetic material particles essentially consisting of the copper, zinc and iron, the toner contg. the styrene/acrylic copolymer of <=2 acid value and the carbon black treated with the amino-modified silicone oil. The positive and adequate triboelectrostatic charge of the electrostatic charge quantity is surely imparted to the toner by the synergistic effect thereof. The images which have the high image density and are free from the fogging are stably formed over many times in this way. |
