Patent ID: 8921020
Filing Date: 2014-12-30
Classification: C08G,G03G

Abstract:
1. An electrophotographic photosensitive member, comprising: a support, a charge-generating layer which is provided on the support and comprises a charge-generating substance, and a charge-transporting layer which is provided on the charge-generating layer and comprises a charge-transporting substance; wherein: a surface layer of the electrophotographic photosensitive member comprises at least one resin selected from the group consisting of a resin B having a structure represented by the following formula (B) and a resin C having a structure represented by the following formula (C); and a lower layer in contact with the surface layer comprises at least one resin selected from the group consisting of a polycarbonate resin D having a repeating structural unit represented by the following formula (D), a polyester resin E having a repeating structural unit represented by the following formula (E), and a polyvinyl acetal resin F having a repeating structural unit represented by the following formula (F-A), a repeating structural unit represented by the following formula (F-B), and a repeating structural unit represented by the following formula (F-C): wherein, in the formula (B), R X Y “k” represents the number of repetitions of a structure within the brackets; and “A” represents a structure represented by the following formula (A): wherein, in the formula (C), R Y R X “l” represents the number of repetitions of a structure within the brackets; and “A” represents a structure represented by the following formula (A): wherein, in the formulas (R25-2) and (R25-3), X in the formula (A), “a”, “b”, and “c” each represent the number of repetitions of a structure within the brackets, an average of “a” in the resin B and the resin C ranges from 10 to 100, an average of “b” in the resin B and the resin C ranges from 1 to 3, and an average of “c” in the resin B and the resin C ranges from 2 to 4; and R wherein, in the formula (D), R Y wherein, in the formula (E), R X Y wherein, in the formula (F-A), R