| 摘要 |
PROBLEM TO BE SOLVED: To provide a carrier for two-component electrophotographic developer which has not only satisfactory fluidity but also proper surface ruggedness that is necessary for impartment of charging and which will not cause cracks/chipping of particles, even when under the influence of agitation stress over a long time. SOLUTION: The carrier core material for electrophotographic developer has raised parts of striped pattern, continuously extended substantially in a plurality of directions, while being superposed on one another on particle surface, wherein the surface on which the raised parts of striped pattern are formed occupies at least 80% of the whole surface of the particles. The carrier for two-component electrophotographic developer is made, by performing resin coating on such a carrier core material that the depth of a groove between raised parts adjacent to each other is 0.05 to 0.2μm, the average surface roughness Ra is 0.1 to 0.3μm, the roundness is 0.90 or more, and the average particle size is 15 to 100μm. COPYRIGHT: (C)2009,JPO&INPIT
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