Magnetic toner

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G - Physics

03

G

G03G 9/083 (2006.01) C01G 49/02 (2006.01)

Patent

CA 2071452

A magnetic toner is constituted by at least a binder resin and a magnetic iron oxide. The magnetic iron oxide is characterized by having an Fe(II) content of 18.5 - 24.1 wt. %, and shows a BET specific surface area of S (m2/g) and an X-ray diffraction pattern giving a half-value width W (deg.) of a diffraction peak corresponding to 311 plane of the magnetic iron oxide in spinel structure, the values S and W satisfying: 4.5x10-3S + 0.130 ~ W ~ 4.5x10-3S + 0.160, and 4.5 ~ S ~ 11Ø Alternatively, the magnetic iron oxide is characterized by having a number-average particle size D satisfying a relationship with W of: -0.08D + 0.180 ~ W ~ -0.08D + 0.212, and 0.10 ~ D ~ 0.45. The relationship between W and S or D indicates a good crystallinity of the magnetic iron oxide which provides the magnetic toner with a stable performance for a long period of time. The magnetic iron oxide can be obtained through a heating treatment at a temperature of 130 - 360 °C within a gaseous mixture of hydrogen and nitrogen containing 50 vol. % or less of hydrogen or at a temperature of 150 - 450 °C in an inert gas.

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