| 摘要 |
<p>The invention relates to a carrier for electrophotography comprising a carrier core material covered with a polymeric polyolefin-based resin. Such a carrier is used that the carrier core material content accounts for 90 wt.% or more of the carrier and the carrier surface has a shape factor S (smoothness) satisfying the relation, 100≤S∫130, when represented by the following equation (I): S = (L2/A)x(1/4π)x100, (where L designates an average value of an outer periphery of a projection of the carrier and A designates an average value of a projected area of the carrier). Accordingly, it is possible to provide a carrier covered with a resin which is excellent in durability, spent resistance and the like, effectively prevents change in properties of matter after a long time use, peeling of a covering resin and deposition of the peeled resin to a doctor blade in a developing machine, and does not cause degradation in a quality of copying in the event of continuous copying, and a developing material for electrophotography making use of the carrier.</p> |
