Patent ID: 7629096
Filing Date: 2009-12-08
Classification: G03G

Abstract:
1. An electrophotographic photoreceptor comprising a conductive support and a photosensitive layer formed on the conductive support, with an undercoat layer provided between the support and the photosensitive layer, characterized in that the undercoat layer has a two-layer structure comprising a first layer which contains a polyimide resin represented by the formula [III] and a second layer containing a thermosetting resin or a thermoplastic resin formed on the first layer, and the photosensitive layer contains at least one of the compounds represented by the following formula [I] and [II] (excluding 1-p-dibenzylaminophenyl-1-p-diethylaminophenyl-4,4-diphenyl-1,3-butadiene) as a charge transport agent: (in the above formula, R 1 and R 2 independently represent an alkyl group having 1-6 carbon atoms which may have a substituent, and R 3 represents a hydrogen atom or a dialkylamino group in which at least one alkyl group has 2 or more carbon atoms), (in the above formula, R 4 —R 7 may be the same or different and independently represent a hydrogen atom, a halogen atom, a alkyl group or alkoxy group having 1-6 carbon atoms or an aryl group which may have a substituent, R 8 represents a hydrogen atom, a halogen atom, an alkyl group or alkoxy group having 1-6 carbon atoms, an aryl group which may have a substituent, an alkenyl group or alkadienyl group which may have a substituent or a group represented by the formula [II′], ad n represents a integer of 0 or 1), (in the above formula, R 9 and R 10 may be the same or different ad independently represent a hydrogen atom, a halogen atom, an alkyl group or alkoxy group having 1-6 carbon atoms or an aryl group which may have a substituent, and n represents an integer of 0 or 1), (in the above formula, X is a divalent polycyclic aromatic group in which the aromatic rings may be linked by a hetero-atom and n is an integer which shows a polymerization degree).