EXTERNAL ADDITIVE FOR TONER AND PROCESS FOR PRODUCING THE SAME

摘要

A barium titanate external additive for toner that when blended in especially a color toner, enhances the toner fluidity, electrical properties and other relevant performance, and that in a printer making use of the toner, simultaneously realizes high image density and reduced background fog and retains high image quality even in high temperature high humidity and low temperature low humidity environments. Further, there is provided an industrially advantageous process for producing the same. The external additive for toner is characterized by consisting of a spherical barium titanate having undergone coating treatment with a hydrophobicizing agent.