EP 1156375 A3 20020821 - Method for using hard magnetic carriers in an electrographic process
Title (en)
Method for using hard magnetic carriers in an electrographic process
Title (de)
Elektrophotographisches Verfahren unter Benutzung von Hartmagnetträgern
Title (fr)
Méthode électrophotograhique utilisant des particules de support contenant un matériau magnétique dur
Publication
Application
Priority
- US 20494100 P 20000517
- US 57298800 A 20000517
- US 57298900 A 20000517
Abstract (en)
[origin: EP1156375A2] Methods for development of an electrostatic image are disclosed that utilize developer compositions with hard magnetic carrier compositions which can provide improved development efficiencies and reduced amounts of image carrier pick-up. The methods utilize hard magnetic carrier particles that are modified to have specific levels of resistivit, such as, for example, of from about 1x10<5> ohm-cm to about 1x10<10> ohm-cm, and a carrier charge-to-mass of greater than about 1.0 mu C/g, which carriers can provide greater development speeds without unacceptable levels of image carrier pick-up. In embodiments, the hard magnetic materials are doped, i.e., bulk substituted, with multi-valent metals to adjust resistivity, while in other embodiments, the hard magnetic materials are coated with at least one multi-valent metal oxide. <IMAGE>
IPC 1-7
IPC 8 full level
G03G 9/08 (2006.01); G03G 9/107 (2006.01); G03G 9/113 (2006.01); G03G 15/08 (2006.01); G03G 15/09 (2006.01); G03G 21/00 (2006.01)
CPC (source: EP US)
G03G 9/1075 (2013.01 - EP US); G03G 9/1085 (2020.08 - EP US); G03G 9/1088 (2020.08 - EP US); G03G 9/1139 (2013.01 - EP); G03G 13/09 (2013.01 - EP US)
Citation (search report)
- [XY] US 5998076 A 19991207 - MAHABADI HADI K [CA], et al
- [Y] US 5948585 A 19990907 - GADY BARRETT L [US], et al
- [AYX] EP 0296072 A2 19881221 - EASTMAN KODAK CO [US]
- [Y] US 4394429 A 19830719 - HAYS DAN A
- [X] EP 0580135 A1 19940126 - CANON KK [JP]
- [XA] EP 0547620 A1 19930623 - EASTMAN KODAK CO [US]
- [X] EP 0668542 A2 19950823 - BASF AG [DE]
- [X] WO 9312470 A1 19930624 - BASF AG [DE]
- [Y] EP 0708379 A2 19960424 - TODA KOGYO CORP [JP]
- [Y] US 4623603 A 19861118 - IIMURA TSUTOMU [JP], et al
- [Y] WO 9115811 A1 19911017 - EASTMAN KODAK CO [US]
- [XY] EP 0353630 A2 19900207 - EASTMAN KODAK CO [US]
- [A] US 4855205 A 19890808 - SAHA BIJAY S [US], et al
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1156375 A2 20011121; EP 1156375 A3 20020821; AU 5976401 A 20011126; CA 2375345 A1 20011122; JP 2003533745 A 20031111; WO 0188623 A1 20011122
DOCDB simple family (application)
EP 01111258 A 20010516; AU 5976401 A 20010514; CA 2375345 A 20010514; JP 2001584955 A 20010514; US 0115510 W 20010514