公开(公告)号：US20230288824A1

公开(公告)日：2023-09-14

申请号：US18181522

申请日：2023-03-09

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Yuto OKAZAKI ,  Tomoya SASAKI ,  Ryosuke FUJII ,  Kohei HASHIMOTO ,  Hiroko KOBAYASHI ,  Kosuke NARITA

IPC: G03G5/05 ,  G03G5/047 ,  C08G63/20 ,  C08G63/81 ,  G03G5/06 ,  G03G21/18

CPC classification number: G03G5/056 ,  G03G5/047 ,  C08G63/20 ,  C08G63/81 ,  G03G5/061446 ,  G03G21/1814

Abstract: An electrophotographic photoreceptor includes a conductive substrate, and a lamination type photosensitive layer disposed on the conductive substrate and including a charge generation layer and a charge transport layer, in which the charge transport layer contains a polyester resin having a structure represented by Formula (1) at a terminal and a charge transport material, and in a case where a weight-average molecular weight Mw of the polyester resin is defined as A (×10,000), a value of a ratio M1/M2 of a mass M1 of the charge transport material to a mass M2 of an entire charge transport layer is defined as Cs, and an average thickness of the charge transport layer is defined as Ds (μm), expressions of 7≤A≤40, 0.28≤Cs≤0.55, 27≤Ds≤50, and 5.0≤(A×Ds)/(Cs×100)≤70 are satisfied,






in Formula (1), nd represents an integer of 0 or greater and 4 or less, nd number of Rd's each independently represent a hydrocarbon group having 1 or more and 4 or less carbon atoms, L represents an ether bond or a —O—C(═O)— group, and * represent a bonding portion.

公开(公告)号：US20230195003A1

公开(公告)日：2023-06-22

申请号：US18071516

申请日：2022-11-29

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Tomoya SASAKI ,  Ryosuke FUJII ,  Kohei HASHIMOTO ,  Hiroko KOBAYASHI ,  Yuto OKAZAKI ,  Kosuke NARITA

IPC: G03G5/047 ,  G03G5/05 ,  C08G63/193 ,  G03G15/00

CPC classification number: G03G5/047 ,  G03G5/056 ,  C08G63/193 ,  G03G15/75

Abstract: An electrophotographic photoreceptor includes a conductive substrate, and a lamination type photosensitive layer disposed on the conductive substrate and including a charge generation layer and a charge transport layer, in which the charge transport layer contains a charge transport material and a polyester resin, and a mass proportion of a chemical substance (AA) represented by Formula (AA) in a total mass of the charge transport layer is 2,000 ppm or less.




In Formula (AA), X represents an organic group, and mAA represents an integer.