Patent ID: 7399564

Claim:
An electrophotographic photoconductor, comprising: a conductive substrate on which a photosensitive layer containing at least a charge generating agent, a hole transfer agent and a binding resin is provided, wherein the binding resin is comprised of a plurality of polycarbonate resins which contain 10 to 80 parts by weight of polycarbonate resin represented by the general formula (7) below and 100 parts by weight of polycarbonate resin represented by the general formula (8) or (9) below, (In the general formula (7), Ra and Rb each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 12 carbon atoms, where the subscripts “k” and “l” each independently represent an integer of 0 to 4; Rc and Rd each represent an alkyl group having 1 to 2 carbon atoms, W represents a single bond or —O— or —CO— and the subscripts “m” and “n” each represent a mole ratio that satisfies a relational expression of 0.05<n/(n+m)<0.6) In the general formula (8), each of plural substituents Re represents a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and the subscript “o” represents an integer of 0 to 4) (In the general formula (9), each of plural substituents Rf represents a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and the subscript “p” represents an integer of 0 to 4); and the photosensitive layer contains a biphenyl derivative as a plasticizer component, represented by the following general formula (1). (In the general formula (1), wherein R 1 to R 10 each independently represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 12, a substituted or unsubstituted alkoxyl group having 1 to 12, a substituted or unsubstituted aryl group having 6 to 30, a substituted or unsubstituted aralkyl group having 6 to 30, a substituted or unsubstituted cycloalkyl group having 3 to 12, a hydroxyl group, a cyano group, a nitro group, an amino group, and “R” represents a substituted or unsubstituted alkylene group having 1 to 12 or an organic functional group containing a nitrogen atom, and the number of repetitions “n” is an integer of 0 to 3).