公开(公告)号：US5622803A

公开(公告)日：1997-04-22

申请号：US356236

申请日：1994-12-14

申请人： Serge Tavernier ,  Werner Op de Beeck ,  Jean-Marie Dewanckele ,  Peter Van Rompuy

发明人： Serge Tavernier ,  Werner Op de Beeck ,  Jean-Marie Dewanckele ,  Peter Van Rompuy

IPC分类号： G03G9/08 ,  G03G9/087 ,  G03G9/097

CPC分类号： G03G9/08759 ,  G03G9/0823 ,  G03G9/08797 ,  G03G9/09741 ,  G03G9/0975 ,  G03G9/09758

摘要： A dry toner powder the toner particles of which are triboelectrically negatively charged and are suited for development of an electrostatic charge pattern, wherein said toner particles contain:(1) at least one triboelectrically negatively chargeable thermoplastic resin serving as binder having a volume resistivity of at least 10.sup.13 .OMEGA.-cm, and(2) at least one resistivity lowering substance being an onium compound having a volume resistivity lower than the volume resistivity of said binder, and said toner particles are free from non-resinous charge-controlling agent(s) providing negative triboelectric chargeability,wherein said substance(s) (2) is (are) capable of lowering the volume resistivity of said binder by a factor of at least 3.3 when present in said binder in a concentration of 5% by weight relative to the weight of said binder, andwherein said toner powder containing toner particles including a mixture of said ingredients (1) and (2) under triboelectric charging conditions is capable of obtaining an absolute median (q/d) charge/diameter value (x) lower than 10 fC/10 .mu.m but not lower than 1 fC/10 .mu.m, and said toner powder under the same triboelectric charging conditions but free from said substance(s) (2) then has an absolute median q/d value (x) at least 50% higher than when said substance(s) (2) is (are) present, and wherein the distribution of the charge/diameter values of the individual toner particles is characterized by a coefficient of variation .nu..ltoreq.0.33.

摘要翻译： PCT No.PCT / EP94 / 01310 Sec。 371日期1994年12月14日第 102（e）日期1994年12月14日PCT 1994年4月25日PCT PCT。 WO94 / 27191 PCT出版物 日期1994年11月24日一种其调色剂颗粒为摩擦带电带电并适于显影静电荷图案的干燥调色剂粉末，其中所述调色剂颗粒包含：（1）至少一种用作粘合剂的摩擦带电性带负电荷的热塑性树脂， 体积电阻率为至少1013欧姆 - 厘米，和（2）至少一种电阻率降低物质是体积电阻率低于所述粘合剂的体积电阻率的鎓化合物，并且所述调色剂颗粒不含非树脂电荷 - 提供负摩擦带电性的控制剂，其中所述物质（2）当以5％的浓度存在于所述粘合剂中时能够将所述粘合剂的体积电阻率降低至少3.3倍， ，并且其中所述调色剂粉末含有包含所述成分（1）和（2）的混合物的调色剂颗粒在摩擦电 充电条件能够获得低于10fC /10μm但不低于1fC /10μm的绝对中值（q / d）电荷/直径值（x），并且所述调色剂粉末在相同的摩擦带电条件 但没有所述物质（2）的绝对中值q / d值（x）比所述物质（2）存在时高出至少50％，并且其中 单个调色剂颗粒的电荷/直径值的特征在于变异系数nu <0.33。