公开(公告)号：EP2281778A4

公开(公告)日：2012-08-08

申请号：EP09746708

申请日：2009-05-14

申请人： CANON KK

发明人： OGAWA YOSHIHIRO ,  HASEGAWA YUSUKE ,  NISHIKAWA KOUJI ,  OKAZAKI MIHO ,  SUZUMURA YOSHITAKA ,  KASUYA TAKASHIGE

IPC分类号： C01B13/14 ,  C01B33/18 ,  C01G23/04 ,  C09C1/30 ,  C09C3/12 ,  G03G9/08 ,  G03G9/097

CPC分类号： C09C3/12 ,  B82Y30/00 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/12 ,  C09C1/3072 ,  C09C1/3081 ,  G03G9/09716 ,  G03G9/09725 ,  Y10T428/2995

公开(公告)号：EP2016466A4

公开(公告)日：2011-08-24

申请号：EP07742847

申请日：2007-04-25

申请人： CANON KK

发明人： HIRATA JUNKO ,  OGAWA YOSHIHIRO ,  HASEGAWA YUSUKE ,  NISHIKAWA KOUJI ,  OKAZAKI MIHO ,  KASUYA TAKASHIGE

IPC分类号： G03G9/083 ,  G03G9/087

CPC分类号： G03G9/0833 ,  G03G9/0834 ,  G03G9/0835 ,  G03G9/0836 ,  G03G9/08755

摘要： The object of the present invention is to provide a magnetic toner enabling an image with high image density and excellent image reproducibility to be obtained, which is excellent in fluidity, charging stability, and charging uniformity, even for long-term use, and also enabling an image whose fogging, ghost, and scattering are suppressed to be obtained. The magnetic toner has at least a binder resin and a magnetic material, where, the magnetic material is an magnetic iron oxide whose dielectric breakdown voltage of the magnetic material is 160 to 1600 V/cm, and the dielectric loss tangent (tan δ) of the magnetic toner at 100 kHz and 40° C. is 2.0×10−3 to 1.0×10−2.