US Patent 8465889 Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

To provide an electrophotographic photosensitive member that can reproduce good images with less positive ghost and also has a good photosensitivity, the electrophotographic photosensitive member is incorporated in its photosensitive layer with a copolymer having a repeating structural unit represented by the formula (1) and a repeating structural unit represented by the formula (2), or a copolymer having a repeating structural unit represented by the formula (1) and a repeating structural unit represented by the formula (3).Z1-A-Z2-E1  (1)Z3-A-Z4—W2—B2—W2  (2)Z5—B3—Z6-E4  (3)