Patent ID: 8247149

Claim:
An electrophotographic developer carrier comprising: a carrier core material, and a coat layer comprising a binder resin and electrical conductivity-imparted microparticles which are produced by treating inorganic microparticles to be electrically conductive, the coat layer being formed over the carrier core material, wherein the inorganic microparticles before treated to be electrically conductive have a specific powder resistivity of 9 or more, and the inorganic microparticles treated to be electrically conductive have a specific powder resistivity of 7 or less, wherein the electrophotographic developer carrier has a static resistivity of 10 [Log (Ω·cm)] or higher and a dynamic resistivity of 9[Log (Ω)] or lower, and is used in an electrophotographic developer together with a negatively chargeable toner having an average circularity of 0.925 to 0.970, and wherein the toner comprises a resin, a colorant and an inorganic layered mineral in which at least part of interlayer ions is modified with organic ions, and is granulated by dispersing and/or emulsifying an oil phase and/or a monomer phase comprising at least a toner composition and/or a toner composition precursor in an aqueous medium.