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    • 9. 发明授权
    • Toner for developing electrostatic images and process for production
thereof
    • 用于显影静电图像的调色剂及其生产方法
    • US5840459A
    • 1998-11-24
    • US662081
    • 1996-06-12
    • Manabu OhnoSatoshi MitsumuraNobuyuki OkuboYoshinori Tsuji
    • Manabu OhnoSatoshi MitsumuraNobuyuki OkuboYoshinori Tsuji
    • G03G9/08G03G9/087G03G9/097
    • G03G9/0821G03G9/08711G03G9/08782G03G9/08797G03G9/09783
    • A toner for developing electrostatic images, includes toner particles and 10-500 isolated low-molecular weight wax particles per 10,000 toner particles. The toner has a melt index as measured at 125.degree. C. under a load of 98 N of at least 10. The toner particles comprise at least a binder resin, a colorant and the low-molecular weight wax. The low-molecular weight wax comprises a compound represented by the formula of: R--Y, wherein R denotes a hydrocarbon group, and Y denotes a hydroxyl group, carboxyl group, alkyl ether group or alkyl ester group. The low-molecular weight wax has a thermal property providing a DSC curve as measured by a differential scanning calorimeter exhibiting: (i) a maximum heat-absorption peak having a peak temperature in a temperature range of 70.degree.-130.degree. C.; (ii) a heat-absorption peak including the maximum heat-absorption peak showing an onset temperature of at least 50.degree. C., and (iii) a maximum heat-evolution peak in a range of .+-.15.degree. C. from the peak temperature of the maximum hat-absorption peak. The toner shows a good fixability while retaining a good productivity through the melt-kneading-pulverization process.
    • 用于显影静电图像的调色剂包括每10,000个调色剂颗粒中的调色剂颗粒和10-500个分离的低分子量蜡颗粒。 该调色剂在125℃负载下测定的熔体指数为98N至少为10.调色剂颗粒至少包含粘合剂树脂,着色剂和低分子量蜡。 低分子量蜡包括由下式表示的化合物:R-Y,其中R表示烃基,Y表示羟基,羧基,烷基醚基或烷基酯基。 低分子量蜡具有提供通过差示扫描量热计测量的DSC曲线的热性质,其显示出:(i)峰值温度在70℃-130℃的最大吸热峰; (ii)包括显示起始温度至少为50℃的最大吸热峰的热吸收峰,和(iii)在+/- 15℃范围内的最大放热峰 最高帽吸收峰的峰值温度。 调色剂通过熔融捏合粉碎过程保持良好的生产率,显示出良好的定影性。
    • 10. 发明授权
    • Magnetic toner, apparatus unit and image forming method
    • 磁性调色剂,设备单元和成像方法
    • US5858593A
    • 1999-01-12
    • US902323
    • 1997-07-29
    • Osamu TamuraKoichi TomiyamaNobuyuki OkuboShunji SuzukiYoshihiro OgawaKeita Nozawa
    • Osamu TamuraKoichi TomiyamaNobuyuki OkuboShunji SuzukiYoshihiro OgawaKeita Nozawa
    • G03G9/08G03G9/083G03G13/09G03G15/08G03G15/09
    • G03G9/0835G03G13/09G03G9/0819G03G9/0821G03G9/0833
    • Disclosed are a magnetic toner for developing an electrostatic latent image comprising magnetic toner particles containing a binder resin of 100 parts by weight and a magnetic substance of 20 to 150 parts by weight, and an apparatus unit and an image forming method for employing the magnetic toner. A frictional electrification property is such that the absolute value of the frictional electrification amount relative to an iron powder of 250 mesh-pass to 350 mesh-on is 25 to 40 mc/kg. Assuming that for particle distribution of the magnetic toner a weight-average particle diameter (D.sub.4) for the magnetic toner is X (.mu.m) and that a count % in a count distribution of magnetic toner particles that have a diameter of 3.17 .mu.m or smaller is Y (%), expressions (1) and (2) are satisfied:-5X+35.ltoreq.Y.ltoreq.-25X+180 (1)3.5.ltoreq.X.ltoreq.6.5 (2).Sphericity (.psi.) of particles is equal to or greater than 0.80 and a product (.sigma..sub.r .times.H.sub.c) of remanence �.sigma..sub.r (Am.sup.2 /kg)! and coercive force (H.sub.c (kA/m)! of the magnetic substance in a magnetic field of 795.8 kA/m (10 k oersted) is 10 to 56 (kA.sup.2 m/kg).
    • 公开了一种用于显影静电潜像的磁性调色剂,其包含含有100重量份的粘合剂树脂的磁性调色剂颗粒和20至150重量份的磁性物质,以及用于使用磁性调色剂的装置单元和图像形成方法 。 摩擦带电特性使得相对于250目通过至350目的铁粉的摩擦带电量的绝对值为25〜40mc / kg。 假设对于磁性调色剂的颗粒分布,磁性调色剂的重均粒径(D4)为X(μm),并且磁性调色剂颗粒的计数分布的计数%为直径为3.17μm,或 较小的是Y(%),表达式(1)和(2)满足:-5X + 35