| 摘要 |
An image forming apparatus and a process cartridge includes a toner for developing an electrostatic image that is constituted by at least a binder resin and a charge control agent. The binder resin has an acid value of 5-50. The charge control agent includes an iron complex represented by the following formula: <IMAGE> wherein X1 and X2 independently denote hydrogen atom, lower alkyl group, lower alkoxy group, nitro group or halogen atom; m and m' denote an integer of 1-3; R1 and R3 independently denote hydrogen atom, C1-18 alkyl or alkenyl, sufonamide, mesyl, sulfonic acid group, carboxy ester group, hydroxy, C1-18 alkoxy, acetylamino, benzoylamino or halogen atom; n and n' denote an integer of 1-3; R2 and R4 denote hydrogen atom or nitro group; and A+denotes hydrogen ion, sodium ion, potassium ion or ammonium ion. The toner has a weight-average particle size (D4) of 4-9 mu m and including toner particles having a particle size of 5 mu m or smaller at 3-90% by number, toner particles having a particle size of 6.35-10.08 mu m at 1-80% by number and toner particles having a particle size of 12.7 mu m or larger at a percentage by volume of at most 2.0%, wherein the toner particles having a particle size of 5.0 mu m or smaller are contained at N % by number and at V % by volume satisfying a relationship: N/V=0.05N+k, wherein k is a positive number in the range of 3.0-7.5.
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