Patent ID: 9235144
Filing Date: 2016-01-12
CPC Classification: G03G

Claim Text:
1. An electrophotographic photosensitive member comprising: a support; a charge-generating layer formed on the support; and a charge-transporting layer formed on the charge-generating layer; wherein, the charge-transporting layer is a surface layer of the electrophotographic photosensitive member, the charge-transporting layer has a matrix-domain structure having: a domain which comprises a polyester resin A having: a structural unit represented by the following Formula (A) and a structural unit represented by the following Formula (B), and a matrix which comprises: a charge-transporting substance, and at least one resin selected from the group consisting of a polyester resin C having a structural unit represented by the following Formula (C) and a polycarbonate resin D having a structural unit represented by the following Formula (D), the content of the structural unit represented by the Formula (A) is 6% by mass or more and 40% by mass or less based on the total mass of the polyester resin A, and the content of the structural unit represented by the Formula (B) is 60% by mass or more and 94% by mass or less based on the total mass of the polyester resin A: wherein, X R n represents the number of repetitions of a structure in brackets, and an average value of n in the polyester resin A is 20 or more and 120 or less; wherein, X wherein, R X Y wherein, R Y wherein, the structural unit represented by the Formula (B) comprises a structural unit represented by the following Formula (B-3), and the content of the structural unit represented by the Formula (B-3) is 30% by mass or more and 100% by mass or less based on the total mass of the structural unit represented by the Formula (B) in the polyester resin A