EP 0064946 B1 19850320 - ISO-INDOLINE PIGMENTS USED FOR PHOTO-ELECTROPHORETIC IMAGING
Title (en)
ISO-INDOLINE PIGMENTS USED FOR PHOTO-ELECTROPHORETIC IMAGING
Publication
Application
Priority
CH 299781 A 19810508
Abstract (en)
[origin: US4427752A] A photoelectrophoretic imaging process, wherein a suspension of photosensitive pigment particles between two electrodes, at least one of which is transparent, is subjected to the influence of an electric field and exposed to an image, which process comprises using, as photosensitive pigment, an isoindoline of the formula <IMAGE> (I) wherein R1 and R3 are cyano, -COOR or -CONHR', in which R is alkyl, cycloalkyl, aryl or a heterocyclic aromatic radical, and R' is hydrogen, alkyl, cycloalkyl, aryl or a heterocyclic aromatic radical, R2 and R4 are cyano, or wherein R3 and R4, together with the carbon atom linking them, form a heterocyclic 6-membered ring. The pigments used in this invention are distinguished by particularly good photoelectrophoretic sensitivity and low fog density.
IPC 1-7
IPC 8 full level
G03G 5/00 (2006.01); G03G 17/04 (2006.01)
CPC (source: EP US)
G03G 17/04 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
EP 0064946 A2 19821117; EP 0064946 A3 19830309; EP 0064946 B1 19850320; CA 1176897 A 19841030; DE 3262613 D1 19850425; JP S57197582 A 19821203; US 4427752 A 19840124
DOCDB simple family (application)
EP 82810182 A 19820430; CA 402429 A 19820506; DE 3262613 T 19820430; JP 7643482 A 19820507; US 37278182 A 19820428