| 摘要 |
<p>PURPOSE:To uniformly form a developer layer on a magnetic roll, to prevent the falling of a carrier and the roughening and drop-out of an image, to ensure electrostatic charge stability of the carrier and to prevent the occurrence of unevenness of an image and the deterioration of image quality by using specified magnetic powder as core particles. CONSTITUTION:When core particles are coated with a coating resin while keeping a dry state and applying shearing force to obtain a carrier for developing an electrostatic charge image, magnetic powder having 30-60mum average particle diameter and including <=25wt.% particles having <=20mum particle diameter is used as the core particles. A copolymer of a fluorine-contg. vinyl monomer such as vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, monochlorotrifluoro-ethylene, monochloroethylene or trifluoroethylene or a polymer of styrene or a styrene deriv. such as chlorostyrene or methylstyrene may be used as the coating resin.</p> |
