| 摘要 |
PURPOSE:To reduce humidity dependency of electric resistance extremely by forming the carrier from ferrite particles having specified degree of pore volume. CONSTITUTION:Ferrite particles having <=2.0X10<-2>cm<3>/g pore volume are useful for a carrier for development in electrophotography. Soft ferrite of 1-3 spinel or 2-3 spinel type, magnetite (Fe3O4) or magnetite (gamma-Fe2O3) having above described pore volume may be useful, but(MO)100-x(Fe2O3)x (where x is >=42 mol%, more particulary, 42-90mol%)is preferred. |
