公开(公告)号：US20190025721A1

公开(公告)日：2019-01-24

申请号：US16035881

申请日：2018-07-16

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi SHIMIZU ,  Kiichiro OJI

IPC: G03G5/06 ,  G03G5/05

Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin has a viscosity average molecular weight of at least 25,000 and no greater than 50,000. A strain at break of the photosensitive layer is at least 4.9% and no greater than 13.0%. A scratch resistant depth of the photosensitive layer is no greater than 0.50 μm.

公开(公告)号：US20180215183A1

公开(公告)日：2018-08-02

申请号：US15879853

申请日：2018-01-25

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi SHIMIZU ,  Kiichiro OJI

IPC: G03G15/00 ,  B41M5/333

CPC classification number: G03G5/0603 ,  G03G5/0514 ,  G03G5/0521 ,  G03G5/0609 ,  G03G5/0629 ,  G03G5/0637 ,  G03G5/0642 ,  G03G5/0661 ,  G03G5/09

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, a binder resin, and an additive. The additive contains a carboxylic acid anhydride. A reduction potential of the carboxylic acid anhydride is at least −1.40 V versus a reference electrode (Ag/Ag+). The carboxylic acid anhydride is contained in an amount of at least 0.02 parts by mass and no greater than 10.00 parts by mass relative to 100 parts by mass of the binder resin.

公开(公告)号：US20230168596A1

公开(公告)日：2023-06-01

申请号：US18059015

申请日：2022-11-28

Applicant: KYOCERA Document Solutions Inc.

Inventor： Yuichi YOSHIDA ,  Kiichiro OJI

IPC: G03G5/06 ,  G03G5/047

CPC classification number: G03G5/0696 ,  G03G5/047 ,  G03G21/1814

Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer. The charge generating layer contains a phthalocyanine pigment and a first resin. A ratio of the mass of the phthalocyanine pigment to the mass of the first resin is greater than 2.0 and less than 3.5. A ratio A830/A783 of a second absorbance A830 to a first absorbance A783 of the charge generating layer is at least 0.97 and no greater than 1.10. The first absorbance A783 is an absorbance of the charge generating layer with respect to first light with a wavelength of 783 nm. The second absorbance A830 is an absorbance of the charge generating layer with respect to second light with a wavelength of 830 nm.

公开(公告)号：US20220128913A1

公开(公告)日：2022-04-28

申请号：US17505721

申请日：2021-10-20

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi SHIMIZU ,  Makoto SHISHIDO ,  Kazuaki EZURE ,  Kiichiro OJI ,  Katsuya TAKANO

IPC: G03G5/06 ,  G03G5/07

Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single layer and contains a charge generating material, a hole transport material, an electron transport material, and a polyarylate resin. The polyarylate resin includes repeating units represented by formulas (1), (2), and (3). A ratio n1/n2 of the number n1 of repeats of the repeating unit represented by formula (1) to the number n2 of repeats of the repeating unit represented by formula (2) is at least 1.0.

公开(公告)号：US20190354029A1

公开(公告)日：2019-11-21

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),