ELECTROSTATIC IMAGE DEVELOPER AND ELECTROSTATIC IMAGE DEVELOPING METHOD

摘要

PURPOSE:To form images having good image quality stably over many times by incorporating a carrier formed by coating magnetic material particles with a styrene/acrylic copolymer, 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 formed by coating the magnetic material particles with the styrene/acrylic copolymer, the toner contg. the styrene/acrylic copolymer of <=2 acid value and the carbon black treated with the amino-modified silicone oil. An adequate release property is imparted to the developer 4 by the carbon black particles treated with the amino-modified silicone oil and the excess electrostatic charge of the developer is prevented. The physical adhesive strength of the developer 4 to the surface of the org. photosensitive body is small. The good transfer is executed by an electrostatic transfer means in a transfer stage in this way and the sharp images which have a high image density and are free from unequal images are surely formed.