| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a developer which is capable of sufficiently preventing the occurrence of an offset, has stable electrostatic chargeability and makes it possible obtain good images having a sufficient image density by incorporating coloring materials, a specific polyester resin binder, specific ester wax, a metal complex charge regulating agent and zinc stearate into the developer. SOLUTION: This developer contains the coloring materials, the polyester resin having an acid value of >=10 as a binder, the ester wax of 70 to 90 deg.C in the endothermic peak of differential scanning heat measurement as wax and the metal complex charge regulating agent and zinc stearate as other additives. Sufficient transparency and color development are indicated by using the polyester resin having the acid value of >=10 and the ester wax of 70 to 90 deg.C in the endothermic peak of differential scanning heat measurement. The developer is provided with the sufficient offset resistance and stable electrostatic chargeability by adding the metal complex charge regulating agent and the Zn stearate thereto.</p> |
