| 摘要 |
<p>A toner for electrostatic image development which has a wide nonoffset temperature range sufficient for practical use and can attain sufficient fixability even in high-speed copying. The toner comprises mainly a binder resin, a colorant, a functional additive, and a charge control agent. The binder resin comprises one or more polyolefin resins which have cyclic structures and consist of a resin or resin fraction having a number-average molecular weights (Mn) smaller than 7,500 as measured by GPC and another resin or resin fraction having a GPC number-average molecular weight of 7,500 or higher. In the polyolefin resin having a cyclic structure, the content of a resin or resin fraction having an intrinsic viscosity (i.v) of 0.25 dl/g or higher, a GPC number-average molecular weight (Mn) of 7,500 or higher, and a GPC weight-average molecular weight (Mw) of 15,000 or higher is lower than 50 wt.% based on the whole binder resin.</p> |
