Patent ID: 7981593

Claim:
An image forming method comprising: transferring a first image of a toner on an image bearing member to a first side of a receiving material via an intermediate transfer medium; fixing the first toner image on the first side of the receiving material via an intermediate transfer medium, wherein the receiving material includes moisture in an amount of not greater than 5% by weight after fixing the toner image on the first side of the receiving material; transferring a second image of the toner on the image bearing member to a second side of the receiving material via the intermediate transfer medium; and fixing the second toner image on the second side of the receiving material, wherein the toner comprises a toner particle and an external additive, the toner particle comprises: a first binder resin; a hydrocarbon wax; a second binder resin; a colorant; and a charge controlling agent, the first binder resin is a vinyl polyester resin including the hydrocarbon wax therein, the second binder resin is a polyester resin, the external additive is a silica having a specific surface area of 30-300 m 2 /g and an adhesion strength of 30-80%, the toner has a volume average particle diameter of 5-12 μm, and the toner satisfies the following relationships (1) and (2): 0.15 ×Q− 2≦ T≦ 0.15× Q− 0.15 (1), and 1.0 ≦T≦ 2.5 (2), Q represents a charge of the toner in units of μC/g, and T represents a torque of the toner in units of mN·m determined by a method using a grooved cone-shaped rotor while controlling a space ratio of the toner at 58%.