公开(公告)号：EP2698673B1

公开(公告)日：2020-10-21

申请号：EP12771219.8

申请日：2012-04-12

申请人： Toda Kogyo Corp.

发明人： KINOSHITA, Kaori ,  KURITA, Eiichi

IPC分类号： G03G9/107 ,  G03G9/113

公开(公告)号：EP2857903B1

公开(公告)日：2018-09-05

申请号：EP13796970.5

申请日：2013-05-30

申请人： Toda Kogyo Corp.

发明人： KINOSHITA, Kaori ,  KURITA, Eiichi

IPC分类号： G03G9/107 ,  G03G9/113 ,  G03G9/10

CPC分类号： G03G9/1135 ,  G03G9/10 ,  G03G9/107 ,  G03G9/1075 ,  G03G9/1131 ,  G03G9/1133 ,  G03G9/1136

摘要： The present invention relates to a magnetic carrier for an electrophotographic developer comprising spherical composite core particles comprising at least ferromagnetic iron oxide fine particles and a cured phenol resin, and having an average particle diameter of 20 to 60 µ m, the magnetic carrier for an electrophotographic developer satisfying the formula (1): à 1 - à 0 = -2 to 0 wherein à 0 represents a saturation magnetization (Am 2 /kg) of the carrier particles having a particle diameter in the vicinity of the average particle diameter of the magnetic carrier for an electrophotographic developer; and à 1 represents a saturation magnetization (Am 2 /kg) of the carrier particles having a particle diameter of less than 20 µ m, and a two-component system developer using the magnetic carrier. The two-component system developer of the present invention includes a magnetic carrier used for an electrophotographic developer which can exhibit a good durability, is free from occurrence of carrier adhesion, and can maintain a high quality of images produced for a long period of time, and comprises the magnetic carrier for an electrophotographic developer and a toner.