EP 0488743 A1 19920603 - Electrophotographic toner for negative charging.
Title (en)
Electrophotographic toner for negative charging.
Title (de)
Elektrophotographischer Toner zum negativen Aufladen.
Title (fr)
Toner électrophotographique pour charger négativement.
Publication
Application
Priority
JP 32836290 A 19901128
Abstract (en)
An electrophotographic toner for negative charging comprises a metal compound of an aromatic hydroxycarboxylic acid 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 9/097 (2006.01)
CPC (source: EP)
G03G 9/097 (2013.01); G03G 9/09783 (2013.01)
Citation (search report)
- [Y] EP 0227874 A1 19870708 - ORIENT CHEMICAL IND [JP]
- [Y] FR 2592184 A1 19870626 - RICOH KK [JP]
- [A] EP 0284000 A2 19880928 - HODOGAYA CHEMICAL CO LTD [JP]
- [X] PATENT ABSTRACTS OF JAPAN vol. 15, no. 23 (P-1155)18 January 1991 ( MITSUBISHI KASEI CORP. ) 29 October 199& JP-A-2 264 970
- [A] PATENT ABSTRACTS OF JAPAN vol. 14, no. 167 (P-1031)30 March 1990 ( RICOH CO., LTD. ) 25 January 1990 & JP-A-2 022 670
- [A] PATENT ABSTRACTS OF JAPAN vol. 10, no. 305 (P-507)(2361) 17 October 1986 ( FUJITSU LTD. ) 6 June 1986 & JP-A-61 118 761
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0488743 A1 19920603; EP 0488743 B1 19960724; DE 69121067 D1 19960829; DE 69121067 T2 19961219; ES 2091883 T3 19961116; JP 2609357 B2 19970514; JP H04195165 A 19920715
DOCDB simple family (application)
EP 91311034 A 19911128; DE 69121067 T 19911128; ES 91311034 T 19911128; JP 32836290 A 19901128