TONER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE

PURPOSE:To provide the toner which is fixed at a low temp. and does not generate the fusing and filming to a photosensitive body even in a high-speed system and in long-time using by using a binder resin which is obtd. by polymerizing a vinyl monomer cong. >=2 kinds of polymn. initiators which are different in half-life and having specific properties. CONSTITUTION:The vinyl monomer is polymerized by incorporating the >=2 kinds of the polymn. initiators which are different in the half-like having 1.5 to 5 ratio of the half-life at 70 deg.C of the polymn. initiator having the longest half-life and the polymn. initiator having the shortest half-life therein. The reaction time is shortened by using >=2 kinds of the polymn. initiators in such a manner. Further, the THF insoluble component of the binder resin is incorporated in the toner at 10 to 60wt.% and further the THF soluble component is required to be Mw/Mn >=5. The offset resistance is degraded when Mw/Mn is below 5. The ratio of the component of