ELECTRICALLY PHOTOSENSITIVE MATERIAL INCLUDING COLORANT COMPOUND COMPRISING TWO MEROCYANINE UNITS JOINED BY A CYANINE GROUP

摘要

Electrically photosensitive complex cyanine colorant compounds each comprising two merocyanine moieties joined by a cyanine moiety are useful in electrically photosensitive materials for photoelectrophoretic (PEP) imaging processes. These compounds are symmetric or asymmetric and have color-conferring groups having the structure: wherein m and n, which are the same or different, are 0, 1 or 2; t and u, which are the same or different, are 0 or 1; p is 0, 1 or 2; R1 and R11, which are the same or different, represent an alkyl, aryl, aralkyl, alkaryl, carbocyclic or heterocyclic group; R2 and R2', which are the same or different, represent an alkyl, aryl, aralkyl, alkaryl, carbocyclic or heterocyclic group; R3 and R33, which are the same or different, represent hydrogen or an alkyl group; R4 and R44, which are the same or different, represent hydrogen or an alkyl group; R4, when taken together with R2 and t is 0, and R44 when taken together with R22 and u is 0, represent the atoms necessary to complete an alkylene or hetero alkylene bridge, R3 and R4, and R33 and R44, when taken together represent the atoms necessary to complete an alkylene or heteroalkylene bridge, Rs, Rb and R7, which are the same or different, represent hydrogen or an alkyl group, or when individually taken together with R' or R" represent the autumn necessary to complete an alkylene or hetero-alkylene bridge; and Y and Y', which are the same or different, represent the atoms necessary to complete a basic heterocyclic cyanine dye nucleus; and A and A1, which are the same or different, represent oxygen, sulfur, selenium or -NR8, wherein R11 represents an alkyl, aryl, aralkyl, alkaryl, carbocyclic or heterocyclic group.