Developer

Abstract

Abstract PURPOSE:To make the triboelectric charge quantity among toner particles, between a toner and a carrier, etc. stable and uniform by contg. fine powder of alpha-quartz type crystalline silica in a developer. CONSTITUTION:Fine powder of silica wherein >=50% is alpha-quartz type crystalline SiO2 is contained in a developer. Said fine powder of silica is obtained by grinding, for example, high-purity- or natural quartz mechanically. Average primary grain sizes are used by controlling the grain sizes to 0.01-2mu. The method of adding said fine powder of silica to the developer is satisfactory if these are added simultaneously in the stage of thermal kneading of a binder resin, etc. in the production stage of the toner. In the case of sticking the same on the surfaces of toner particles, the toner particles are ground after thermal kneading and are controlled to several - several 10mu grain sizes, after which it is added by using a mixer. The amt. of addition of said fine powder to the developer is 0.01-20wt%.

Inventors

• 👤 Masanori Takenouchi
• 👤 Toru Matsumoto

Bibliographic Details