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    • 1. 发明授权
    • Toner for developing electrostatic image
    • 用于显影静电图像的调色剂
    • US5750303A
    • 1998-05-12
    • US841337
    • 1997-04-30
    • Kohji InabaKazunori KatoKengo Hayase
    • Kohji InabaKazunori KatoKengo Hayase
    • G03G9/087G03G9/093G03G9/097
    • G03G9/08755G03G9/08782G03G9/08791G03G9/08793G03G9/08795G03G9/08797G03G9/09328
    • A toner for developing an electrostatic image includes toner particles constituted by at least a binder resin, a colorant, a polar resin and a release agent. The polar resin has at least one terminal group which has been modified by a polycarbonate acid having at least three carboxyl groups. The polar resin has an acid value of 3-35 mgKOH/g. The polar resin may preferably be a polyester resin having an acid value of 4-35 mgKOH/g and having a number-average molecular weight (Mn) of 3,000-15,000, a weight-average molecular weight (Mw) of 6,000-50,000, and an Mw/Mn of 1.2-3.0 based on GPC. The polar resin (preferably polyester resin) having modified by a polycarboxylic acid having at least three carboxylic groups to provide a specific acid value is effective in improving resultant toner performances, such as low-temperature fixability, anti-offset characteristic at high temperatures, triboelectric chargeability, and flowability.
    • 用于显影静电图像的调色剂包括由至少粘合剂树脂,着色剂,极性树脂和脱模剂构成的调色剂颗粒。 极性树脂具有至少一个末端基团,其被具有至少三个羧基的聚碳酸酯改性。 极性树脂的酸值为3-35mgKOH / g。 极性树脂可以优选为酸值为4-35mgKOH / g,数均分子量(Mn)为3,000-15,000,重均分子量(Mw)为6,000-50,000的聚酯树脂, 和基于GPC的Mw / Mn为1.2-3.0。 通过具有至少三个羧基的多元羧酸改性以提供特定酸值的极性树脂(优选聚酯树脂)在改善所得调色剂性能方面是有效的,例如低温定影性,高温下的抗偏移特性,摩擦电 充电性和流动性。
    • 10. 发明授权
    • Toner for developing electrostatic image containing hydrophobized
inorganic fine powder
    • 用于显影含有疏水化无机细粉的静电图像的调色剂
    • US5827632A
    • 1998-10-27
    • US909877
    • 1997-08-12
    • Kohji InabaTatsuya NakamuraTatsuhiko ChibaTakao Ishiyama
    • Kohji InabaTatsuya NakamuraTatsuhiko ChibaTakao Ishiyama
    • G03G9/08G03G9/097
    • G03G9/0825G03G9/09716G03G9/09725
    • A toner for developing electrostatic images includes (a) toner particles having a weight-average particle size of 1-9 .mu.m, (b) hydrophobized inorganic fine powder having an average particle size of 10-90 nm and (c) hydrophobized silicon compound fine powder. The hydrophobized silicon compound fine powder has an average particle size of 30-120 nm, and a particle size distribution such that it contains 15-45% by number of particles having sizes of 5-30 nm, 30-70% by number of particles having sizes of 30-60 nm and 5-45% by number of particles having sizes of at least 60 nm. The hydrophobized silicon compound fine powder having a broad particle size distribution including coarse particles functions to prevent the embedding of the hydrophobized inorganic fine powder (functioning as a flowability improver) from being embedded at the toner particle surfaces, whereby the toner is allowed to exhibit stable performances even in a continuous image formation on a large number of sheets.
    • 用于显影静电图像的调色剂包括(a)重均粒径为1-9μm的调色剂颗粒,(b)平均粒度为10-90nm的疏水化无机细粉末和(c)疏水化硅化合物 细粉。 疏水化硅化合物细粉末的平均粒径为30〜120nm,粒径分布为15〜45个数量的粒径为5〜30nm,粒径为30〜70体积% 具有30-60nm的尺寸和5-45个数量的具有至少60nm的尺寸的颗粒。 疏水化硅化合物细粉末,其具有包括粗粒子的宽粒度分布的功能,以防止疏水化无机细粉末(作为流动性改进剂起作用)的嵌入被嵌入调色剂颗粒表面,从而调色剂显示稳定 即使在大量纸张上连续成像也能进行表演。