Patent ID: 7135261

Claim:
A multi-layered organic electrophotographic photoconductor comprising: a conductive substrate and layers including an undercoat layer containing a thermosetting resin, a charge generation layer containing charge generation material and organic binder resin, and a charge transport layer laminated sequentially on the substrate, wherein polydispersity defined by a ratio of a weight average molecular weight to a number average molecular weight of the organic binder resin is at least 4.0, and the weight average molecular weight is at least 7.0×10 4 in a distribution of a polystyrene-converted molecular weight obtained by gel permeation chromatography, wherein the binder resin of the charge generation layer is substantially composed of poly(vinyl acetal) represented by the following chemical formula (1), where i, m, and n are integers, and R is an alkyl group of one or more carbons or a hydrogen atom, and wherein the binder resin of the charge generation layer is substantially composed of a mixture of two or more poly(vinyl acetal) resins that have different weight average molecular weights and have an overlapping range in molecular weight distributions.