Patent ID: 7115346

Claim:
A multi-layered electrophotographic positively charged organic photoconductor comprising: a conductive substrate; a charge transport layer on the conductive substrate; and a charge generating layer on the charge transport layer, in which a first composition to form the charge transport layer comprises: at least one hole transport material; a binder resin; and an organic solvent, and a second composition to form the charge generating layer comprises: a charge generating material; a binder resin; an organic solvent; and a hole transport material, wherein the hole transport material in the composition to form the charge transport layer comprises a mixture of the following compounds: a stilbene compound having a structure of the following formula (I): in which, R1 and R2 are independently selected from the group consisting of a hydrogen atom, an alkyl group, an aryl group, and a styryl group, provided that at least one of R1 and R2 is selected from an aryl group and styryl group; R3 is selected from the group consisting of a substituted or unsubstituted alkyl group, an aralkyl group and an aryl group; R4 and R5 independently selected from the group consisting of a hydrogen atom and an alkyl group; and R6 is selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group and an alkoxy group; and a hydrazone compound having a structure of the following formula (II): in which, n is an integer from 2 to 6; R 1 and R 2 are independently selected from among an alkyl group, a cycloalkyl group, and an aryl group and optionally combined with the nitrogen atom to form a ring; Y is selected from among a bond, a carbon atom, a —CR 3 group where R 3 is a hydrogen atom or an alkyl group or an aryl group, an aryl group, a cycloalkyl group, and a cyclosiloxyl group; and X is a linking group of the formula of —(CH 2 ) m — where m is an integer from 4 to 10 and at least one methylene group is optionally substituted with an oxygen atom, a carbonyl group, or an ester group.