EP 0488744 A1 19920603 - Electrophotographic toner for negative charging.
Title (en)
Electrophotographic toner for negative charging.
Title (de)
Elektrophotographischer Toner für Negativaufladung.
Title (fr)
Toneur électrophotographique pour charger négativement.
Publication
Application
Priority
JP 32836390 A 19901128
Abstract (en)
An electrophotographic toner for negative charging comprises an acrylamide copolymer containing sulfonic acid groups as a charge-controlling agent for negative charging and a quaternary ammonium salt having an oxyacid anion as a charge-controlling assistant, a fixing resin and a colorant. The quaternary ammonium salt used as the assistant is incompatible with a fixing resin but dispersible therein. The toner provides a sharp distribution of the charge quantity so that formation of highly charged toner particles which do not contribute to development and lowly charged toner particles which are easily scattered is effectively prevented.
IPC 1-7
IPC 8 full level
G03G 9/08 (2006.01); G03G 9/087 (2006.01); G03G 9/09 (2006.01); G03G 9/097 (2006.01)
CPC (source: EP)
G03G 9/08726 (2013.01); G03G 9/09741 (2013.01); G03G 9/0975 (2013.01)
Citation (search report)
- [Y] EP 0276963 A2 19880803 - FUJIKURA KASEI KK [JP]
- [Y] EP 0284000 A2 19880928 - HODOGAYA CHEMICAL CO LTD [JP]
- [YP] EP 0430700 A2 19910605 - MITA INDUSTRIAL CO LTD [JP]
- [Y] EP 0330287 A2 19890830 - MITA INDUSTRIAL CO LTD [JP]
- [A] EP 0203818 A2 19861203 - MITA INDUSTRIAL CO LTD [JP]
- [Y] PATENT ABSTRACTS OF JAPAN vol. 14, no. 167 (P-1031)(4110) 30 March 1990 & JP-A-2 022 670 ( RICOH ) 25 January 1990
- [A] PATENT ABSTRACTS OF JAPAN vol. 10, no. 305 (P-507)(2361) 17 October 1986 & JP-A-61 118 761 ( FUJITSU LTD ) 6 June 1986
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0488744 A1 19920603; EP 0488744 B1 19960717; DE 69120908 D1 19960822; DE 69120908 T2 19961128; ES 2091884 T3 19961116; JP 2609358 B2 19970514; JP H04195166 A 19920715
DOCDB simple family (application)
EP 91311035 A 19911128; DE 69120908 T 19911128; ES 91311035 T 19911128; JP 32836390 A 19901128