Patent ID: 7169519

Claim:
A double-layered positively-charged organic photoreceptor comprising: an electroconductive support; a charge transport layer formed on the electroconductive support, comprising: a first charge transport compound that is soluble in an acetate solvent; a second charge transport compound that is insoluble in an acetate solvent; and a binder resin; and a charge generating layer formed on the charge transport layer, wherein the first charge transport compound is at least one selected from charge transport compounds of formula (1) below: where R1 and R2 are independently selected from the group consisting of a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, and a substituted or unsubstituted styryl, in which at least one of R1 and R2 is a substituted or unsubstituted aryl group or a substituted or unsubstituted styryl; R3 is selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl, and a substituted or unsubstituted aryl group; R4 and R5 are independently selected from the group consisting of a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted benzyl group, and a substituted or unsubstituted phenyl group; and R6 is selected from the group consisting of a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkoxy group, and a halogen atom, and wherein the second charge transport compound is at least one of charge transport compounds of formula (2) below: where n is an integer from 2 to 6; R1 and R2 are independently selected from among an alkyl group, a cycloalkyl group, and an aryl group and optionally combine with the nitrogen atom to form a ring; Y is selected from among a bond, a carbon atom, a —CR3 group where R3 is a hydrogen atom, an alkyl group, or an aryl group, an aryl group, a cycloalkyl group, and a cyclosiloxyl group; X is a linking group of the formula of —(CH2)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, wherein an amount of the first charge transport compound is in a range of 30–90% by weight based on a total weight of the first and the second charge transport compounds.