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    • 1. 发明授权
    • Electrostatographic developer composition
    • 静电显影剂组合物
    • US5545501A
    • 1996-08-13
    • US347346
    • 1994-12-06
    • Serge TavernierFrank RuttensAndr e VerheckenJozef MampaeyLudovicus Joly
    • Serge TavernierFrank RuttensAndr e VerheckenJozef MampaeyLudovicus Joly
    • G03G9/00G03G9/08G03G9/087G03G9/10G03G9/107G03G9/113
    • G03G9/1075G03G9/08G03G9/0819G03G9/0823G03G9/10
    • This invention provides an electrostatographic developer composition comprising carrier particles and toner particles with a toner particle size distribution having a volume average particle size (T) such that 4 m.mu..ltoreq.T.ltoreq.12 .mu.m and an average charge (absolute value) pro diameter in femtocoulomb/10 .mu.m (C.sub.T) after triboelectric contact with said carrier particles such that 1 fC/10 .mu.m.ltoreq.C.sub.T .ltoreq.10 fc/10 .mu.m characterised in that(i) said carrier particles have a saturation magnetization value, M.sub.sat, expressed in Tesla (T) such that M.sub.sat .gtoreq.0.30 T(ii) said carrier particles have a volume average particle size (C.sub.avg) such that 30 .mu.m.ltoreq.C.sub.avg .ltoreq.60 .mu.m(iii) said volume based particle size distribution of said carrier particles has at least 90% of the particles having a particle diameter C such that 0.5 C.sub.avg .ltoreq.C.ltoreq.2C.sub.avg(iv) said volume based particles size distribution of said carrier particles comprises less than b % particles smaller than 25 .mu.m wherein b=0.35.times.(M.sub.sat).sup.2 .times.P withM.sub.sat : saturation magnetization value, M.sub.sat, expressed in TP: the maximal field strength of the magnetic developing pole expressed in kA/m(v) said carrier particles comprise a core particle coated with a resin coating in an amount (RC) such that 0.2% w/w.ltoreq.RC.ltoreq.2% w/w.
    • PCT No.PCT / EP94 / 01855 Sec。 371日期1994年12月6日第 102(e)日期1994年12月6日PCT提交1994年6月7日PCT公布。 公开号WO95 / 00884 日期1995年1月5日本发明提供了一种静电显影剂组合物,其包含载体颗粒和调色剂颗粒,其调色剂颗粒尺寸分布具有体积平均粒度(T),使得4μm×T≤12μm, 在与所述载体颗粒摩擦电接触之后,在毫微伏库仑/ 10微米(CT)中的平均电荷(绝对值)原子直径,使得1fC /10μm/ CT = 10fc /10μm,其特征在于(i )所述载体颗粒具有以特斯拉(T)表示的饱和磁化值Msat,使得Msat> / = 0.30T(ii)所述载体颗粒具有使得30μmCavg的体积平均粒径(Cavg) (iii)所述载体颗粒的所述基于体积的粒度分布具有至少90%的具有粒径C的颗粒,使得0.5Cavg(iv)所述基于体积的 所述载体颗粒的颗粒尺寸分布包括小于25μm的小于b%的颗粒,其中b = 0.35x(Msat )2xP,具有Msat:饱和磁化值,Msat,以TP表示:磁显影极的最大场强以kA / m表示(v)所述载体颗粒包括涂覆有量(RC)的树脂涂层的芯颗粒, 使得0.2%w / w RC = 2%w / w。