| 摘要 |
PURPOSE:To contrive the improvement of the stability in triboelectrification by using organic resin particles for which external additive having a specific particle size and a relative electric resistance and which are electrostatically charged with an inverse polarity against the resin particle incorporating a coloring agent at the triboelectrification, covering a core material with a mixture incorporating in the specified amount of an organic resin having a specific electric resistance as a carrier and preparing a specific particle size. CONSTITUTION:The external additive is 20-200mum in a particle size and has 10<6>-10<14>OMEGAcm of a relative electric resistance and is the organic resin particle electrostatically charged with an inverse polarity against the resin particle incorporating the coloring agent when triboelectrified with the carrier. The carrier is the organic resin whose relative electric resistance is in a range of 10<6>-10<14>OMEGAcm or a covered carrier having 25-65mum of a weight average particle size covered the carrier core material with a mixture incorporating >=70wt.% of the organic resin, at 0.05-10wt.% for the weight of the carrier material. Thus the rise of electrification and the level of an saturated charge capacity of the toner are improved in the various environments and can be maintained safely. |
