| 摘要 |
PURPOSE:To obtain an electrically semiconductive composition, containing good electrically conductive material powder having a specific volume resistivity and hydrophobized particles of electrically conductive zinc in an insulating high polymer molding material and capable of forming developing rolls, etc., with homogeneous volume resistivity. CONSTITUTION:An electrically semiconductive composition obtained by blending (A) good electrically conductive material powder (e.g., carbon or graphite powder) having 10<-6>-10<-1>OMEGA.cm volume resistivity and preferably <=1mum particle diameter with (B) hydrophobized particles of electrically conductive zinc, prepared by adding a treating agent consisting essentially of Al to zinc oxide powder, stirring, heat-treating the resultant mixture and treating the surface of the resultant electrically conductive ZnO with a titanate based coupling agent or fatty acid based compound and having 10<1>-10<4>OMEGA.cm volume resistivity and preferably 0.1-3mum particle diameter at ratios (wt.%) satisfying formulas I-IV in an insulating high polymer molding material (preferably phenolic resin). |
