| 摘要 |
The present invention provides a non-magnetic monocomponent negatively chargeable spherical toner including: a toner mother particle having a binder resin and a colorant; and an external additive including a hydrophobic inorganic fine particle having a number average primary particle size of 7 to 50 nm and a hydrophobic monodisperse spherical silica particle having a number average primary particle size of 70 to 130 nm, wherein the non-magnetic monocomponent negatively chargeable spherical toner has a mechanical strength of from 7 to 19 MPa, provided that the mechanical strength is determined from a 10% displacement load of a compression-displacement curve obtained in a microcompression test, wherein the hydrophobic monodisperse spherical silica particle has a work function (Phi<SUB>S</SUB>) smaller than a work function (Phi<SUB>TB</SUB>) of the toner mother particle, and a image forming apparatus using the toner.
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