Electrophotographic photosensitive member, process cartridge, electrophotographic apparatus and method of manufacturing the electrophotographic photosensitive member

摘要

A charge-transporting layer, which is a surface layer of an electrophotographic photosensitive member, has a matrix-domain structure having a matrix containing constituent β (a polycarbonate resin having a predetermined repeating structural unit) and a charge-transporting substance, and a domain containing constituent α (a polycarbonate resin having a repeating structural unit having a predetermined siloxane moiety).

主权项

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 is a surface layer of the electrophotographic photosensitive member; wherein the charge-transporting layer has a matrix-domain structure having: a domain which comprises the constituent α, and a matrix which comprises the constituent β and a charge-transporting substance; wherein the constituent α is a polycarbonate resin A having a repeating structural unit represented by the following formula (A), a repeating structural unit represented by the following formula (B) and a repeating structural unit represented by the following formula (C), the content of a siloxane moiety in the polycarbonate resin A is not less than 5% by mass and not more than 40% by mass relative to the total mass of the polycarbonate resin A, the content of the repeating the structural unit represented by the formula (B) is not less than 10% by mass and not more than 30% by mass relative to the total mass of the polycarbonate resin A, and the content of the repeating the structural unit represented by the formula (C) is not less than 25% by mass and less than 85% by mass relative to the total mass of the polycarbonate resin A; wherein, in the formula (A), “n” represents number of repetitions of a structure within the bracket, an average of “n” in the polycarbonate resin A ranges from 20 to 60; wherein, in the formula (B), Y represents an oxygen atom or a sulfur atom, and R1 and R2 each independently represents a hydrogen atom, or a methyl group; wherein the constituent β is a polycarbonate resin D having a repeating structural unit represented by the following formula (D)