Abstract
These days, electrophotographic color copying machine and color printers have become popular for office use. Further to some commercial printing market, the electrophotographic system has been supplied in association with the trend of high definition. With this recent tendency, color toner is in widespread use and its particle size is getting smaller, and the surface processed titanium dioxide products are used increasingly as external additives as is the case of silica. Ultra-fine titanium dioxide treated with organic surface processing can be effective to improve electrostatic charge control, environmental stability and flowability of toner as an external additive. This paper is introducing production method of titanium dioxide external additive and the function related to the difference in surface processing and particle diameter as an external additive.
