Kyocera Corporation

Takaaki Arai

Hiroaki Moriyama

Tatsuya Yasui

A magnetic toner for MICR printers is provided with a binder resin, magnetic powder, and metal oxide particles which are in the outer surface of each toner base particle made from the binder resin and the magnetic powder, the metal oxide particles having a volume resistivity of 1&times;10 to 1&times;10 &OHgr;&middot;cm. A developer containing this MICR toner makes it possible to provide superior image density and reading precision, even after 150,000 to 300,000 sheets of A-4 paper have been continuously printed.

Magnetic toner for MICR printers, developer for MICR printers and manufacturing method thereof

A magnetic toner for a MICR printer containing a binder resin and a magnetic powder is prepared in such a way that the magnetic powder includes a first magnetic powder having a residual magnetization value within a range of 24 to 40 emu/g and a second magnetic powder having a residual magnetization value within a range of 1 to 24 emu/g (but exclusive of 24 m.sup.2 /g) and that the residual magnetization value of the magnetic toner for a MICR printer is within a range of 7.0 to 20 emu/g (but exclusive of 7.0 emu/g).

Growing community of inventors

Mie, Japan

Takaaki Arai