| 摘要 |
Generation of a drum filming layer is prevented by obtaining a developing agent meeting the relationship y<0.057x+0.1748, where x represents the total addition amount of the additive, which is not smaller than 0.2, and y represents the free component content obtained from the difference in the fluorescence X-ray analytical value between the front surface and the back surface of a pellet of the developing agent, by quantitatively analyzing the free component content of the additive to the developing agent and by using a binder resin satisfying the conditions of 2,000<=number average molecular weight<=5,000, 8,000<=weight average molecular weight<=70,000, and 1.6<=Mw/Mn<=35.
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