Magnetic one-component toner and image forming apparatus using it
AssigneeKYOCERA Document Solutions Inc.
InventorToshiki TAKEMORI
Life of this patent
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Abstract
Magnetic one-component toner has toner particles including: a toner base particle containing at least a binder resin and a magnetic powder; and an external additive attached to the surface of the toner base particle. The toner base particle contains a nigrosine dye. The external additive contains strontium titanate particles of which the surface is hydrophobically treated. The amount of nitrogen element in toner particles is 0.5 mass % or more but 5 mass % or less. The Abs value representing the amount of nigrosine dye that dissolves when toner particles are immersed in methanol as expressed in terms of light absorbance is 0.2 or more but 2.0 or less. The volume resistivity of strontium titanate particles is 1.0 E+7 [Ω·cm] or more but 1.0 E+10 [Ω·cm] or less.
Claims5
Magnetic one-component toner composed of toner particles, the toner particles comprising:
- a toner base particle that contains at least a binder resin and a magnetic powder;
- and
- an external additive attached to a surface of the toner base particle, wherein
- the toner base particle contains a nigrosine dye,
- the external additive contains strontium titanate particles of which a surface is hydrophobically treated,
- an amount of nitrogen element in the toner particles is 0.5 mass % or more but 5 mass % or less,
- an Abs value representing an amount of nigrosine dye that dissolves when the toner particles are immersed in methanol as expressed in terms of light absorbance is 0.2 or more but 2.0 or less,
- a volume resistivity of the strontium titanate particles is 1.0 E+7 [Ω·cm] or more but 1.0 E+10 [Ω·cm] or less.
Dependencies are inferred from the claim text.