Patent ID: 7074539

Claim:
An image forming method for forming an image on both sides of a sheet, comprising: forming a first toner image on a photoreceptor; transferring the first toner image to a first side of a sheet; fixing the first toner image on the sheet with a fixing device; returning the sheet from the fixing device to the photoreceptor without stacking the sheet on an intermediate tray while forming a second toner image on the photoreceptor; transferring the second toner image on the photoreceptor to a second side of the sheet; fixing the second toner image on the sheet with the fixing device, wherein the photoreceptor comprising an electrically conductive support having thereon a charge generating layer and a charge transport layer, and the charge transport layer comprises a charge transport material comprising a mixture of stereoisomers as a charge transport material and a binder resin wherein glass transition point Tgb of the binder resin of the charge transport layer and glass transition point Tgl of the charge transport layer satisfy the relationship; 100Â° C.< Tgl<Tgb (both Tgb and Tgl in Â°C.); and wherein molecular weight of the charge transport material comprising a mixture of stereoisomers is from 600 to 1,500.