| 摘要 |
PURPOSE:To obtain the toner applicable to a plain paper copying system as well by fixing a nonferrous metal oxide or ferrous/nonferrous metal oxide having a small electrical conductivity as a black coloring agent onto the surfaces of thermoplastic resin particles. CONSTITUTION:This toner is formed by fixing the black nonferrous metal oxide or ferrous/nonferrous metal oxide mixture having <=0.5mum grain size and >=5X10<6>OMEGAcm specific volume resistivity value alone or together with the fine particles of a charge control agent and other necessary particles to the surfaces of the thermoplastic resin particles having 1 to 15mum average grain size. The specific volume resistivity of the toner does not, therefore, degrade as compared with the coloration by the carbon black. The toner which can be applied to the plain paper copying system is obtd. in this way. |
