Migration imaging process

An imaging method comprising providing a migration imaging member comprising a substrate and an electrically insulating softenable layer on said substrate, said softenable layer comprising a substituted, unsymmetrical tertiary amine charge transport molecule and a fracturable monolayer of electrically photosensitive migration marking material located substantially at or near the surface of said softenable layer spaced from said substrate, said charge transport molecule being predominantly nonabsorbing in the spectral region at which said electrically photosensitive migration marking material photogenerates charge carriers, being capable of increasing charge injection from said electrically photosensitive migration marking material to said softenable layer and being dissolved or molecularly dispersed in said softenable layer, electrostatically charging said member, exposing said member to activating radiation in an imagewise pattern whereby said electrically photosensitive migration marking material stuck by said activating radiation photogenerates charge carriers, decreasing the resistance to migration of migration marking marking material in said softenable layer sufficiently to allow slight migration in depth of migration marking material towards said substrate in image configuration, and further decreasing the resistance to migration of marking material in said softenable layer sufficiently to allow nonmigrated marking material to agglomerate.

An imaging method comprising providing a migration imaging member comprising a substrate and an elecrically insulating softenable layer on said substrate, said softenable layer comprising a charge transport molecule and a fracturable layer of electrically photosensitive migration marking material located substantially at or near the surface of said softenable layer spaced from said substrate, said charge transport molecule being predominantly nonabsorbing in the spectral region at which said electrically photosensitive migration marking material photogenerates charge carriers, being capable of increasing charge injection from said electrically photosensitive migration marking material to said softenable layer and being dissolved or molecularly dispersed in said softenable layer, said softenable layer containing at least one material having a HOMO which lies from about 0.05 eV below the top of the valence band to above the top of said valence band of said electrically photosensitive migration marking material and a sufficient concentration of said charge transport molecule to allow electron injection into migration marking material exposed to activating radiation, electrostatically charging said member to a positive polarity, exposing said member to activating radiation in an imagewise pattern whereby said electrically photosensitive migration marking material struck by said activating radiation photogenerates charge carriers, decreasing the resistance to migration of migration marking marking material in said softenable layer sufficiently by exposure to solvent vapor to allow slight migration in depth of migration marking material towards said substrate in image configuration, and further decreasing the resistance to migration of marking material in said softenable layer sufficiently by heating to allow nonmigrated marking material to agglomerate.

An imaging method comprising providing a migration imaging member comprising a substrate and an electrically insulating softenable layer on said substrate, said softenable layer comprising a charge transport molecule and a fracturable layer of electrically photosensitive migration marking material located substantially at or near the surface of said softenable layer spaced from said substrate, said charge transport molecule being predominantly nonabsorbing in the spectral region at which said electrically photosensitive migration marking material photogenerates charge carriers, being capable of increasing charge injection from said electrically photosensitive migration marking material to said softenable layer and being dissolved or molecularly dispersed in said softenable layer, said softenable layer containing at least one material having a LUMO which lies from below the bottom of the conduction band to slightly above said bottom of said conduction band of said electrically photosensitive migration marking material and a sufficient concentration of said charge transport molecule to allow electron injection into said migration marking material exposed to activating radiation, electrostatically charging said member to a negative polarity, exposing said member to activating radiation in an imagewise pattern whereby said electrically photosensitive migration marking material stuck by said activating radiation photogenerates charge carriers, decreasing the resistance to migration of migration marking marking material in said softenable layer sufficiently by exposure to solvent vapor to allow slight migration in depth of migration marking material towards said substrate in image configuration, and further decreasing the resistance to migration of marking material in said softenable layer sufficiently by heating to allow nonmigrated marking material to agglomerate.