Developing agent, method of measuring free component content of additive in developing agent, and method of evaluating developing agent
AssigneeToshiba Tec Kabushiki Kaisha
InventorYukihiro Fujikura
Life of this patent
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Abstract
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.
Claims4
A developing agent, comprising:
- toner particles containing a binder resin and a colorant, said binder resin satisfying the conditions of:
- 2,000≦number average molecular weight Mn≦5,000;
- 8,000≦weight average molecular weight Mw≦70,000;
- and
- 1.6≦Mw/Mn≦35;
- and
- an additive mixed with said toner particles,
- wherein said developing agent satisfies the relationship y<0.057x+0.1748, where x represents the total amount of the additive, which is not smaller than 0.2, and y represents the content of the free component of the additive.
Dependencies are inferred from the claim text.