PURPOSE: To obtain a developer small in deterioration after long time use, by using a carrier obtained by coating resin particles contg. dispersed magnetic powder, with another resin.
CONSTITUTION: Use of a carrier composed of resin and magnetic powder lowers specific gravity of the carrier, weakens the impact of the carrier on a toner when the developer is stirred in a developing vessel, and prevents the toner from becoming spent. Covering the carrier surface with the resin makes the surface of the carrier and an amt. of charge of the toner uniform. The resin used for coating the carrier is polystyrene, styrene-butadiene copolymer, styrene-acrylate copolymer, or the like as same as that of the carrier resin, or low surface energy resin, such as polytetrafluoroethylene, polyvinylidene fluoride, or dimethylsilicone resin.
OCHI TOSHIYUKI
WAKAMIYA KATSUTOSHI
| JPS5532073A | 1980-03-06 | |||
| JPS5466134A | 1979-05-28 | |||
| JPS5859457A | 1983-04-08 |