| 摘要 |
A developing agent contains a first wax-containing binder resin having a first wax and a first binder resin, a second wax-containing binder resin having a second wax and a second binder resin, and a coloring material. If the dispersibility of a wax is low because its SP value, molecular weight, or glass transition point is high, combinations of these waxes and resins are so selected that a resin having an SP value close to the SP value of that wax or a resin having a high SP value is combined with that wax.
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