Mita Industrial Co., Ltd.

Toshiro Okae

Masami Tsujihiro

Toyotsune Inoue

Naruo Yabe

Hiroshi Shimoyama

Takuya Kadota

Numerous projections are formed on the surface of toner particles by fine particles which are added to a monomer when preparing spherical toner particles by a suspension polymerization. Alternatively, spherical toner particles may be deformed when they are aggregated together with inorganic matter, and then the inorganic matter is chemically removed. The electrophotographic toner produced by deforming spherical toner particles has a narrow particle size distribution, reduced particle size, and excellent flowability. This improves the cleaning properties of the resultant toner, which can be scraped off the photoconductive drum using a cleaning blade.

Method of producing electrophotographic toner

Electrophotographic toner and method of producing the toner

A two-component binder-type magnetic carrier for developing agent comprising a magnetic powder and a binder resin. The carrier particles contain dispersed therein a release agent of the type of a metal soap and have abrasive or collapsible surfaces. By using the developing agent which contains this carrier, the magnetic powder peels off the carrier particle surfaces maintaining a controlled particle diameter and amount. Therefore, the carrier particles possess fresh surfaces at all times, whereby the occurrence of spent toner is effectively prevented and the charging amount of the toner is stably maintained.

Magnetic carrier for electrophotographic developing agent

Growing community of inventors

Osaka, Japan

Toshiro Okae