公开(公告)号：EP2439593A4

公开(公告)日：2012-12-05

申请号：EP10783459

申请日：2010-06-04

Applicant: TODA KOGYO CORP

Inventor： IWAMI KATSUJI ,  HARADA SHIGENORI ,  KURITA EIICHI ,  KINOSHITA KAORI

IPC: G03G9/107 ,  G03G9/113

CPC classification number: G03G9/1075 ,  G03G9/0819 ,  G03G9/0827 ,  G03G9/08755 ,  G03G9/0918 ,  G03G9/107 ,  G03G9/1131 ,  G03G9/1133 ,  G03G9/1134 ,  G03G9/1135 ,  G03G9/1136

Abstract: The present invention relates to a magnetic carrier for an electrophotographic developer comprising spherical magnetic composite particles comprising a phenol resin as a binder and ferromagnetic iron oxide particles bonded to each other through the phenol resin, wherein the spherical magnetic composite particles have a ten-point mean roughness Rz of 0.3 to 2.0 µm. The magnetic carrier for an electrophotographic developer according to the present invention exhibits an excellent durability against peeling-off and abrasion of coating resins formed thereon and a high stability to mechanical stress exerted onto the carrier, is free from occurrence of spent toner, can be stably held over a long period of time without occurrence of fogging and unevenness in density of toner images, and can keep high-quality images with an excellent gradation for a long period of time.

公开(公告)号：EP2444847A4

公开(公告)日：2013-09-04

申请号：EP10789494

申请日：2010-06-15

Applicant: TODA KOGYO CORP

Inventor： KINOSHITA KAORI ,  UEMOTO SHINJI ,  KURITA EIICHI

IPC: G03G9/107 ,  G03G9/113

CPC classification number: G03G9/1131 ,  G03G9/107 ,  G03G9/1133 ,  G03G9/1134 ,  G03G9/1135 ,  G03G9/1137

公开(公告)号：EP2698673A4

公开(公告)日：2014-10-01

申请号：EP12771219

申请日：2012-04-12

Applicant: TODA KOGYO CORP

Inventor： KINOSHITA KAORI ,  KURITA EIICHI

IPC: G03G9/107 ,  G03G9/113

CPC classification number: G03G9/107 ,  G03G9/0804 ,  G03G9/1075 ,  G03G9/113 ,  G03G9/1133 ,  G03G9/1135 ,  G03G9/1136

Abstract: The present invention provides a magnetic carrier for an electrophotographic developer which has an excellent durability and a stable charging property and is free from occurrence of spent toner thereonto, and a two-component system developer comprising the magnetic carrier for an electrophotographic developer and a toner. The present invention relates to a core material of a magnetic carrier for an electrophotographic developer comprising spherical composite particles comprising at least ferromagnetic iron oxide fine particles and a cured phenol resin and having an average particle diameter of 1 to 100 µ m, a resin index of the spherical composite particles being within the range of 35 to 80%, and a magnetic carrier obtained by coating a surface of respective particles of the magnetic carrier core material with a resin.

公开(公告)号：EP2692692A4

公开(公告)日：2014-10-01

申请号：EP12765876

申请日：2012-03-29

Applicant: TODA KOGYO CORP

Inventor： HARADA SHIGENORI ,  UEMOTO SHINJI ,  MISAWA HIROMITSU ,  KURITA EIICHI ,  AOKI KOSO

IPC: C01G49/08 ,  G03G9/107 ,  G03G9/113

CPC classification number: G03G9/0839 ,  C01P2004/04 ,  C01P2004/45 ,  C01P2004/51 ,  C01P2004/62 ,  C01P2006/12 ,  C01P2006/42 ,  C01P2006/62 ,  C09C1/24 ,  G03G9/107 ,  G03G9/113 ,  G03G9/1134 ,  G03G9/1135 ,  G03G9/1136 ,  Y10T428/2982

公开(公告)号：EP2416220A4

公开(公告)日：2016-07-20

申请号：EP10758498

申请日：2010-03-24

Applicant: TODA KOGYO CORP

Inventor： SAKAMOTO MUNEYOSHI ,  KURITA EIICHI ,  MISAWA HIROMITSU

IPC: G03G9/107 ,  B22F1/00 ,  B22F1/02 ,  G03G9/083 ,  G03G9/087 ,  G03G9/093 ,  G03G9/113 ,  H01F1/06 ,  H01F1/14 ,  H01F1/26 ,  H01F1/34

CPC classification number: H01F1/26 ,  B22F2999/00 ,  C22C2202/02 ,  G03G9/0831 ,  G03G9/0832 ,  G03G9/0833 ,  G03G9/107 ,  G03G9/1075 ,  G03G9/113 ,  G03G9/1132 ,  G03G9/1135 ,  G03G9/1138 ,  H01F1/14 ,  H01F1/344 ,  H01F1/37 ,  B22F1/0011 ,  B22F2304/10

公开(公告)号：EP2857903A4

公开(公告)日：2016-01-06

申请号：EP13796970

申请日：2013-05-30

Applicant: TODA KOGYO CORP

Inventor： KINOSHITA KAORI ,  KURITA EIICHI

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

CPC classification number: G03G9/1075 ,  G03G9/10 ,  G03G9/107 ,  G03G9/1131 ,  G03G9/1133 ,  G03G9/1135 ,  G03G9/1136

Abstract: 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.

公开(公告)号：EP1281731A4

公开(公告)日：2006-06-07

申请号：EP01930084

申请日：2001-05-11

Applicant: TODA KOGYO CORP ,  ICHIMURA KUNIHIRO

Inventor： ICHIMURA KUNIHIRO ,  ARIMITSU KOJI ,  TAHARA MASARU ,  KURITA EIICHI

IPC: C09B67/20 ,  G03F7/004 ,  B41M5/30 ,  C08F2/44 ,  C08F2/46 ,  C08K5/00 ,  C08L101/00 ,  C09B7/02 ,  C09B57/00 ,  C09B67/28 ,  C09D7/12 ,  C09D11/02 ,  C09D11/033 ,  C09D11/037 ,  C09D201/00 ,  G03C1/675 ,  G03F7/027 ,  G03F7/105

CPC classification number: C09B57/004 ,  C09B7/02 ,  C09B67/006 ,  C09B67/0077 ,  G03F7/105

Abstract: A coloring composition which is added to solids such as solid resins. The composition comprises: (i) a soluble colorant precursor formed from a colorant having at least one NH group in the molecule by replacing the hydrogen atom of the NH group with an alkoxycarbonyl group represented by the general formula (1) (wherein R represents tert-butyl, tert-amyl, 2-phenyl-2-propyl, or diphenylmethyl); (ii) an acid multiplier which newly generates an acid by the action of an acid; and (iii) an acid generator which generates an acid by the action of actinic energy rays or heat.