Persistent photoconductive compositions
AssigneeXerox Corporation
InventorsDavid J. Williams, Marcel A. Lardon, Martin A. Abkowitz, Gustav Pfister
Life of this patent
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Abstract
Photoconductive compositions comprising an organic photoconductive material, an activator capable of forming a charge transfer complex with the photoconductive material, and a protonic acid. Imaging members provided with an imaging layer prepared from the above composition are highly light sensitive, requiring only brief exposure times, and exhibit a photoinduced state of elevated conductivity which persists long after exposure to light is terminated. These compositions can be returned to their relatively insulative state by merely subjecting the imaging layer to heat in the dark, thereby erasing this photoinduced image pattern of elevated conductivity.
Claims18
A photoconductive composition comprising an organic photoconductive electron donor material, an activator capable of formation of a charge transfer complex with said photoconductive material and a protonic acid having an aqueous dissociation constant of at least 10.sup.-.sup.4, said acid being present in sufficient concentration in relation to the activator to enhance the stability of a complex formed during illumination between the anion radical form of the activator and a proton and thus extend the elevated level of conductivity of the composition in these light struck areas subsequent to illumination.
An imaging member comprising a coherent, adherent photoconductive imaging layer overlying at least one surface of a conductive substrate, said photoconductive imaging layer comprising an organic photoconductive electron donor material, an activator capable of forming a charge transfer complex with said photoconductive material and a protonic acid having an aqueous dissociation constant of at least 10.sup.-.sup.4, said acid being present in a sufficient concentration in relation to the activator to enhance the stability of a complex formed during illumination between the anion radical form of the activator and a proton and thus extend the elevated level of conductivity in these light struck areas subsequent to illumination.
Dependencies are inferred from the claim text.