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公开(公告)号：US11150569B2
公开(公告)日：2021-10-19
申请号：US16200338
申请日：2018-11-26
Applicant: POWDERTECH CO., LTD.
Inventor： Yuzuru Yamasaki , Takao Sugiura , Takeshi Naito , Tetsuya Uemura
Abstract: Provided are a ferrite carrier core material for an electrophotographic developer having a full length L1 of grain boundary and a circumference length L2 of the core material in a cross-section of the core material, and satisfying a relationship of 2≤L1/L2≤9; a carrier for an electrophotographic developer including the ferrite carrier core material and a coating layer containing a resin provided on a surface of the ferrite carrier core material; and an electrophotographic developer including the carrier and a toner.
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