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    • 72. 发明授权
    • Reversible image display medium
    • 可逆图像显示介质
    • US06774879B2
    • 2004-08-10
    • US09875959
    • 2001-06-08
    • Hidetoshi MiyamotoKeyaki YogomeMasahiko MatsuuraHiroshi MizunoTakaji Kurita
    • Hidetoshi MiyamotoKeyaki YogomeMasahiko MatsuuraHiroshi MizunoTakaji Kurita
    • G09G334
    • G02F1/167
    • This invention provides a reversible image display medium comprising two substrates opposed to each other with a predetermined gap therebetween, one or more developer-accommodating cells formed between the two substrates, and a dry developer accommodated in each cell, in which the dry developer contains at least two kinds of frictionally chargeable dry developer particles having different chargeable polarities and different optical reflection densities, the reversible image display medium having at least any of the following features: (1) at least one kind of the developer particles being magnetic particles containing a binder resin having a magnetic substance incorporated therein, the magnetic particles having a saturation magnetization degree in the range of 20 emu/g to 50 emu/g; (2) at least one kind of the dry developer particles has a volume resistivity &rgr; in the range of 1.0×1010 &OHgr;·cm to 1.0×1014 &OHgr;·cm; (3) the dry developer contains inorganic fine powder as a fluidization agent, the inorganic fine powder having a BET specific surface area of 80 m2/g to 300 m2/g; and (4) the dry developer is accommodated in the cell in an amount of 20 vol. % to 50 vol. % based on the volume of the cell.
    • 本发明提供一种可逆图像显示介质,其包括彼此相对的两个基板,其间具有预定的间隙,在两个基板之间形成一个或多个显影剂容纳单元,以及容纳在每个单元中的干显影剂,其中干显影剂包含在 至少两种可摩擦带电的干显影剂颗粒具有不同的可充电极性和不同的光学反射浓度,可逆图像显示介质具有以下特征中的至少一个:(1)至少一种显影剂颗粒是含有粘合剂的磁性颗粒 具有掺入其中的磁性物质的树脂,所述磁性颗粒的饱和磁化度在20emu / g至50emu / g的范围内;(2)至少一种所述干燥显影剂颗粒的体积电阻率rho在所述范围内 为1.0×10 10Ω·cm〜1.0×10 14Ω·cm;(3)干显影剂含有无机细粉末作为流化 所述无机细粉末的BET比表面积为80m 2 / g〜300m 2 / g, 和(4)将干燥的显影剂以20体积的量容纳在电池中。 %至50体积 基于单元的体积%。