| 摘要 |
A developer ensuring stabilized image quality without causing any image defect even after long term use. The positively chargeable developer comprises positively chargeable toner particles containing at least binding resin and magnetic iron oxide, silica and inorganic powder, characterized in that the uniaxial yield stress of the developer is 0.1-2. 5 kPa at the time of the maximum compaction stress of 5 kPa, and 2.5-5.5 kPa at the time of the maximum consolidation stress of 20 kPa.
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