Electrophotographic developer

Abstract

A developer for electrophotography comprising of a carrier and a magnetic toner containing cyclo-olefin copolymer resin as a binder resin. A carrier in which a surface of the core particle is coated by resin coating agent or a magnetic material dispersed resin carrier, is desirable. In the case in which saturation magnetization of the carrier at external magnetic field of 5 kOe is Sc, it is desirable that saturation magnetization St of magnetic toner at external magnetic field of 5 kOe satisfy the relationship of 0.10 Sc≦St≦0.40 Sc. In this way, the developer for electrophotography in which environmental resistance is superior, appropriate image density is maintained even after a large number of copies are made, fogging and toner dusting are minimized, and the amount of toner consumed is reduced, can be provided by the present invention.

Dependencies are inferred from the claim text.