公开(公告)号：US10761441B2

公开(公告)日：2020-09-01

申请号：US16411173

申请日：2019-05-14

Applicant: KYOCERA Document Solutions Inc.

Inventor： Jun Azuma ,  Tomofumi Shimizu ,  Kenji Kitaguchi ,  Kiichiro Oji

IPC: G03G5/05 ,  G03G5/06

Abstract: A method for producing an electrophotographic photosensitive member includes an electrically conductive substrate and a photosensitive layer. The method includes applying an application liquid for photosensitive layer formation containing a solvent, a binder resin, and a hole transport material directly or indirectly onto the electrically conductive substrate, and removing a portion of the solvent, to form the photosensitive layer. The solvent contains a first solvent that is an alcohol having a carbon number of at least 1 and no greater than 3, and a second solvent other than the first solvent. The binder resin includes a polyarylate resin that is a polymerization product of monomers including a first monomer represented by general formula (1) and a second monomer represented by general formula (2),

公开(公告)号：US10545418B2

公开(公告)日：2020-01-28

申请号：US16092013

申请日：2017-03-17

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi Shimizu ,  Hideki Okada

IPC: G03G5/06 ,  C07C211/54 ,  C07D241/36

Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer containing at least a charge generating material, an electron transport material, a hole transport material, and a binder resin. The electron transport material includes a naphthoquinone derivative represented by general formula (1). An amount of triboelectric charge of calcium carbonate as measured by charging the calcium carbonate through friction with the photosensitive layer (3) is at least +7 μC/g. In general formula (1), R11 and R12 are respectively the same as R11 and R12 described in the description.

公开(公告)号：US10359713B2

公开(公告)日：2019-07-23

申请号：US15948825

申请日：2018-04-09

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi Shimizu ,  Jun Azuma

IPC: G03G5/05 ,  G03G5/06

Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer having a single-layer structure. The photosensitive layer contains a charge generating material, an electron transport material, and a binder resin. The electron transport material includes a compound having a halogen atom and represented by a general formula (1), (2), (3), (4), or (5). The binder resin includes a polyarylate resin. The polyarylate resin includes at least one type of repeating unit each represented by general formula (11), at least one type of repeating unit each represented by general formula (12), and a terminal group represented by general formula (13). In general formula (13), Rf represents a chain aliphatic group substituted by at least one fluoro group. A charge of calcium carbonate charged by friction between the photosensitive layer and the calcium carbonate is at least +8.0 μC/g.

公开(公告)号：US10241428B2

公开(公告)日：2019-03-26

申请号：US15667690

申请日：2017-08-03

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi Shimizu ,  Keiji Maruo

IPC: G03G5/05 ,  G03G5/06 ,  G03G5/047

Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The photosensitive layer has a scratch resistance depth of no greater than 0.50 μm.

公开(公告)号：US10191397B2

公开(公告)日：2019-01-29

申请号：US15668774

申请日：2017-08-04

Applicant: KYOCERA Document Solutions Inc.

Inventor： Keiji Maruo ,  Tomofumi Shimizu ,  Jun Azuma

IPC: G03G5/05 ,  G03G5/06 ,  G03G5/10 ,  G03G15/00

Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin. The polyarylate resin is represented by general formula (1). The hole transport material contains a compound represented by general formula (HTM1), (HTM2), (HTM3), (HTM4), (HTM5), (HTM6), or (HTM7). The photosensitive layer has a scratch resistance depth of no greater than 0.50 μm. The photosensitive layer has a Vickers hardness of at least 17.0 HV.