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    • 9. 发明授权
    • Toner and image forming method
    • 调色剂和成像方法
    • US07704661B2
    • 2010-04-27
    • US12563533
    • 2009-09-21
    • Naotaka IkedaShinya YachiKatsuyuki NonakaEmi WatanabeKoji AbeNobuhisa Abe
    • Naotaka IkedaShinya YachiKatsuyuki NonakaEmi WatanabeKoji AbeNobuhisa Abe
    • G03G9/08
    • G03G9/09725G03G9/0806G03G9/08711G03G9/09716
    • A toner is provided which has toner particles and a fine silica powder mixed by external addition to the toner particles. The toner has a weight average particle diameter of 4.0 to 9.0 μm. The fine silica powder is subjected to hydrophobic treatment with dimethylsilicone oil, and has, in particle size distribution based on volume, a peak at which cumulative frequency is largest, in the measurement range of 0.02 μm to 1,000.00 μm; the cumulative frequency of 0.10 μm to less than 1.00 μm being 7.0% or less, and, the fine silica powder fulfills the following conditions: 1) A+B≧93.0; 2) 0.45≦A/B≦6.00; and 3) the value of [(carbon content of the treated fine silica powder)/(BET specific surface area of fine silica powder before hydrophobic treatment)] is 0.030 or more to 0.055 or less.
    • 提供了一种调色剂,其具有通过外部添加到调色剂颗粒而混合的调色剂颗粒和二氧化硅微粉。 调色剂的重均粒径为4.0〜9.0μm。 用二甲基硅油对二氧化硅粉末进行疏水处理,在0.02〜1000.00μm的测定范围内,以体积分布为基准的累积频率最大的峰值, 0.10μm至小于1.00μm的累积频率为7.0%以下,二氧化硅微粉满足以下条件:1)A +B≥93.0; 2)0.45≦̸ A / B≦̸ 6.00; 3)[(二氧化硅微粉处理的碳含量)/(疏水处理前的二氧化硅微粉末的BET比表面积)]为0.030以上至0.055以下。