Patent ID: 9146487
Filing Date: 2015-09-29
Classification: G03G

Abstract:
1. A carrier for developing electrostatic latent images, comprising: a core material having a surface roughness of from 0.3 to 0.4 μm; and a covering layer formed of a resin comprising an electroconductive particulate material, overlying the core material, wherein the electroconductive particulate material comprises a substrate comprising alumina; and an electroconductive covering layer comprising tin dioxide, overlying the substrate; wherein the covering layer comprises the electroconductive particulate material in an amount of from 58 to 73% by weight and has a resistivity of from 6.6 to 8.6 Ωcm, and wherein the carrier has a high-brightness contrast part at an areal ratio less than 1% and 40 to 90% based on total area thereof at an acceleration voltage of 0.8 KV and 2.0 KV, respectively in an FE-SEM reflection electron image of the surface thereof.