Full color image forming method, and toner and intermediate transfer material for the method

摘要

A full color image forming method including the steps of developing an electrostatic latent image formed on an image bearing member with a color toner to form a color toner image thereon; first transferring the color developer including a color toner image onto an endless intermediate transfer material while applying a developing bias thereto; repeating the above-mentioned steps a plurality of times using a plurality of different color developers to form a full color toner image on the intermediate transfer material; and second transferring the full color image onto a receiving material, wherein a weight of each of the color toner images formed on the image bearing member is from about 0.4 mg/cm² to about 1.5 mg/cm², and each of the color developers has a charge quantity not less than 15 &mgr;C/g in an absolute value, and wherein the following relationship is satisfied with respect to each of the first color toner transferring steps: 5.4×Q1+90Vb−V15.4×Q1+150, wherein Vb represents the developing bias voltage (V), V1 represents a potential (V) of a background area of the electrostatic latent image, on which the color toner image is not to be formed, and Q1 is the charge quantity (&mgr;C/g) of the color developer.