| 摘要 |
PURPOSE:To obtain a dry process developer which has good flowability and cleanability, is excellent in environmental stability and durability and obviates generation of toner filming on the surface of a carrier by external adding fine particles of cerium fluoride to a toner. CONSTITUTION:The fine particles of the cerium fluoride are stuck to the particle surfaces of the toner consisting of a binder resin and coloring agent. The sticking may be mechanical sticking and may be loose fixing on the surfaces. The fine particles of the cerium fluoride are not required to coat the entire surface of the toner particles. In addition, the fine powder may be coated partially as the aggregate but the coating in a single-layer particle state is more preferable. Styrene, ethylene, etc., are used as the binder resin of the toner and, for example, carbon black, aniline blue, etc., are used as the coloring agent. The high flowability is obtd. with this dry process developer. In addition, the developer has the good flowability and cleanability, is excellent in the environmental stability and durability and does not generate the toner filming on the carrier surface. |
