ELECTROPHOTOGRAPHIC TONER COMPOSITION

摘要

PURPOSE:To provide the electrophotographic toner capable of high-quality images free from fluctuation of image quality due to environmental conditions and a number of prints by controlling electric charging or preventing filming of toner particles made of a polyester resin small in particle diameter. CONSTITUTION:The electrophotographic toner composition comprises at least toner particles consisting of a binder resin composed mainly of a polystyrene resin and a colorant having an average particle diameter of <=9mum and additives, such as fine particles of amorphous titania surface-treated with a coupling agent and hydrophobic silica.