发明授权
- 专利标题: Color toner and image forming method
- 专利标题(中): 彩色墨粉和成像方法
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申请号: US215325申请日: 1998-12-18
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公开(公告)号: US06013402A公开(公告)日: 2000-01-11
- 发明人: Makoto Kanbayashi , Masaaki Taya , Wakashi Iida , Tetsuya Ida
- 申请人: Makoto Kanbayashi , Masaaki Taya , Wakashi Iida , Tetsuya Ida
- 申请人地址: JPX Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX9-348751 19971218
- 主分类号: G03G9/08
- IPC分类号: G03G9/08 ; G03G9/097 ; G03G13/16 ; G03G9/09
摘要:
A color toner has (i) color toner particles containing at least a binder resin and a colorant and (ii) an external additive. The color toner has a weight-average particle diameter of 5 to 8 .mu.m and a number-average particle diameter of 4.5 to 7.5 .mu.m, and contains 5 to 40% by number of particles having a particle diameter of 4 .mu.m or less in the number distribution of the color toner and 7% by volume or less of particles having a particle diameter of 10.08 .mu.m or more in the volume distribution of the color toner. The inorganic powder selected from the group consisting of a strontium titanate powder, a cerium oxide powder and a calcium titanate powder, and a hydrophobic fine alumina powder are externally added to the color toner particles as the external additives, the inorganic powder has a longitudinal average particle diameter of 0.2 to 2 .mu.m, and the hydrophobic fine alumina powder has a longitudinal average particle diameter of 0.005 to 0.1 .mu.m. The binder resin is a polyester resin crosslinked by a crosslinking agent. The color toner particles contain 0 to 20 mg/lg of a chloroform insoluble matter. The color toner has a storage modulus (G'.sub.130) of 2.times.10.sup.3 to 2.times.10.sup.4 [dyn/cm.sup.2 ] at a temperature of 130.degree. C. and a storage modulus (G'.sub.170) of 5.times.10.sup.3 to 5.times.10.sup.4 [dyn/cm.sup.2 ] at a temperature of 170.degree. C., and a value of G'.sub.170 /G'.sub.130 is in the range of 0.25 to 10.
公开/授权文献
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