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US 5,688,623 AGranted
Carrier for developing electrostatic latent image
AssigneeMinolta Co., Ltd.
InventorsMinoru Nakamura, Masahiro Anno, Makoto Kobayashi
Life of this patent
Estimating the term…
Abstract
A carrier for developing electrostatic latent image includes a ferrite core particle which contains MnO and 0.5 to 4 molar percent of CaO, and a resin coating layer formed on the core particle.
Claims18
A carrier for developing electrostatic latent image comprising:
- (a) a ferrite core particle which contains CaO, MnO and at least one component selected from the group consisting of CuO and ZnO, said CaO being contained in an amount of 0.5 to 4 molar percent on the basis of the core particle, said MnO being contained in an amount of 2 to 20 molar percent on the basis of the core particle;
- and
- (b) a resin overcoating layer formed on a surface of the core particle.
A carrier for developing electrostatic latent image comprising a core particle coated with a resin and having a static electric resistance of 1.times.10.sup.8 to 5.times.10.sup.9 .OMEGA..multidot.cm, a dynamic current of 0.2 to 1.0 .mu.A and a saturated magnetization of 65 to 80 emu/g.
Dependencies are inferred from the claim text.