| 摘要 |
A magnetic toner composition having excellent electric charge characteristics is provided to reduce a difference in electrostatic charges between a residual toner in a cartridge or developing device and a supplied toner, and to improve the quality of electrostatic image development. A magnetic toner composition comprises: (a) magnetic toner parent particles; (b) hydrophobic silica having a specific surface area of 20-80 m^2/g; (c) hydrophobic silica having a specific surface area of 110-25 m^2/g; (d) an organic compound represented by the following formula 1 and having an electron transportability of 0.5X10^-8 to 2.0X10^-6 cm^2/Vs; and inorganic micropowder having an average particle diameter of 0.1-2.0 micrometers. In formula 1, R1 and R2 are the same or different, and represent a C6-C40 aryl group non-substituted or substituted with at least one substituent selected from the group consisting of amino, nitrile, nitro, C1-C40 alkyl, C2-C40 alkenyl, C1-C40 alkoxy, C3-C40 cycloalkyl, C3-C40 heterocycloalkyl, C6-C40 aryl, C5-C40 heteroaryl and arylamine groups; a C5-C40 heteroaryl non-substituted or substituted with at least one substituent selected from the group consisting of halogen, amino, nitrile, nitro, C1-C40 alkyl, C2-C40 alkenyl, C1-C40 alkoxy, C3-C40 cycloalkyl, C3-C40 heterocycloalkyl, C6-C40 aryl and C5-C40 heteroaryl; or a C6-C40 amino group non-substituted or substituted with at least one substituent selected from the group consisting of halogen, amino, nitrile, nitro, C1-C40 alkyl, C2-C40 alkenyl, C1-C40 alkoxy, C3-C40 cycloalkyl, C3-C40 heterocycloalkyl, C6-C40 aryl and C5-C40 heteroaryl; at least one of R3 and R4 is a group represented by the following formula 2 or 3; and when one of R3 and R4 is a group represented by formula 2 or 3, the other is a substituted or non-substituted C6-C40 aryl group, substituted or non-substituted C5-C40 heteroaryl group, or substituted or non-substituted C6-C40 amino group.
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