Patent ID: 8574799

Claim:
An electrophotographic photoreceptor comprising an electroconductive substrate and a photosensitive layer provided thereon, wherein the photosensitive layer comprises a binder resin comprising a polycarbonate resin consisting of a constituent unit represented by the following formula (A) and a constituent unit represented by the following formula (B), wherein the content of the constituent unit represented by formula (A) is 7 to 20% by weight based upon the total constituent units and the intrinsic viscosity thereof is 0.3 to 2 dl/g, wherein, in formula (B), R 1 to R 4 , each independently, represent a group selected from the group consisting of a hydrogen atom, a halogen group, a C 1-9 alkyl group, a C 6-12 aryl group, a C 2-5 alkenyl group, a C 1-5 alkoxy group and a C 7-17 aralkyl group, wherein the C 1-9 alkyl group, the C 6-12 aryl group, the C 2-5 alkenyl group, the C 1-5 alkoxy group and the C 7-17 aralkyl group can be bonded to a substituent selected from the group consisting of a C 1-5 alkyl group, a C 2-5 alkenyl group, a C 1-5 alkoxy group and a halogen group; and X represents a divalent group selected from the group consisting of one of the following structures wherein: R 5 represents a group selected from the group consisting of a halogen group, an a C 1-9 alkyl group, a C 1-5 alkoxy group and a C 6-12 aryl group, wherein the C 1-9 alkyl group, the C 1-5 alkoxy group and the C 6-12 aryl group can be bonded to a substituent selected from the group consisting of a C 1-5 alkyl group, a C 2-5 alkenyl group, a C 1-5 alkoxy group and a halogen group, R 6 represents a group selected from the group consisting of a hydrogen atom, a halogen group, a C 1-9 alkyl group, a C 1-5 alkoxy group and a C 6-12 aryl group, wherein the C 1-9 alkyl group, the C 1-5 alkoxy group and the C 6-12 aryl group can be bonded to a substituent selected from the group consisting of a C 1-5 alkyl group, a C 2-5 alkenyl group, a C 1-5 alkoxy group and a halogen group, or R 5 and R 6 represent a group forming a carbon ring or a heterocycle, which can be substituted with a substituent selected from the group consisting of a C 1-5 alkyl group, a C 2-5 alkenyl group, a C 1-5 alkoxy group and a halogen group, wherein R 5 and R 6 are bonded with each other; “a” represents an integer of 0-20 other than 1; and each of R 7 and R 8 independently represents a group selected from the group consisting of a hydrogen atom, a halogen group, a C 1-9 alkyl group, a C 1-9 alkoxy group and a C 6-12 aryl group, wherein the C 1-9 alkyl group, the C 1-9 alkoxy group and the C 6-12 aryl group can be bonded to a substituent selected from the group consisting of a C 1-5 alkyl group, a C 2-5 alkenyl group, a C 1-5 alkoxy group and a halogen group, or R 7 and R 8 represent a group forming a carbon ring or a heterocycle, which can be substituted with a substituent selected from the group consisting of a C 1-5 alkyl group, a C 2-5 alkenyl group, a C 1-5 alkoxy group and a halogen group, wherein R 7 and R 9 are bonded with each other.