公开(公告)号：US10481511B2

公开(公告)日：2019-11-19

申请号：US16035881

申请日：2018-07-16

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi Shimizu ,  Kiichiro Oji

IPC: G03G5/05 ,  G03G5/06

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：US10379451B2

公开(公告)日：2019-08-13

申请号：US15904527

申请日：2018-02-26

Applicant: KYOCERA Document Solutions Inc.

Inventor： Jun Azuma ,  Kensuke Okawa ,  Akihiko Ogata ,  Kenji Kitaguchi ,  Tomofumi Shimizu

IPC: G03G5/05 ,  G03G5/047 ,  G03G5/06 ,  C08G63/672 ,  C08G63/91 ,  C08G63/682

Abstract: A polyarylate resin includes at least one type of repeating unit represented by a general formula (1), at least one type of repeating unit represented by a general formula (2), and a terminal group represented by a general formula (3). R1, R2, R3, and R4 each represent, independently of one another, a hydrogen atom or a methyl group. R5 and R6 each represent, independently of each other, a hydrogen atom or a C1-4 alkyl group. R5 and R6 may bond together to represent a C5-7 cycloalkylidene group. X1 represents a divalent group represented by a chemical formula (2A), (2B), (2C), or (2D) with the proviso that when only one type of repeating unit represented by the general formula (2) is included, X1 does not represent a divalent group represented by the chemical formula (2D). Rf represents a chain aliphatic group having at least one fluoro group.

公开(公告)号：US10273331B2

公开(公告)日：2019-04-30

申请号：US15824745

申请日：2017-11-28

Applicant: KYOCERA Document Solutions Inc.

Inventor： Jun Azuma ,  Kenji Kitaguchi ,  Kensuke Okawa ,  Seiki Hasunuma ,  Tomofumi Shimizu

IPC: G03G5/05 ,  G03G5/06 ,  C08G63/19 ,  C08G63/181 ,  C08L67/02

Abstract: A polyarylate resin is represented by general formula (1) shown below. In general formula (1), R1 and R2 each represent, independently of one another, a hydrogen atom or a methyl group. r and s each represent an integer of at least 0 and no greater than 49. t and u each represent an integer of at least 1 and no greater than 50. r+s+t+u=100. r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), chemical formula (1-2), chemical formula (1-3), or chemical formula (1-4). X and Y are different from one another.

公开(公告)号：US11092904B2

公开(公告)日：2021-08-17

申请号：US16632239

申请日：2018-06-26

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi Shimizu

IPC: G03G5/06 ,  G03G5/05

Abstract: A single-layer photosensitive layer of an electrophotographic photosensitive member contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The charge generating material is a phthalocyanine pigment. A content percentage of the phthalocyanine pigment relative to the mass of the photosensitive layer is at least 0.70% by mass and no greater than 1.40% by mass. A film thickness of the photosensitive layer is at least 25 μm and no greater than 32 μm. A charge amount difference ΔQ is no greater than 6.50 μC.

公开(公告)号：US11067909B2

公开(公告)日：2021-07-20

申请号：US16632197

申请日：2018-07-17

Applicant: KYOCERA Document Solutions Inc.

Inventor： Jun Azuma ,  Kensuke Kojima ,  Tomofumi Shimizu ,  Hideki Okada

IPC: G03G5/06 ,  G03G5/05 ,  C07C209/06 ,  C07C211/54 ,  G03G5/047

Abstract: A compound is represented by general formula (1). In general formula (1), R1 and R2 each represent, independently of one another, a hydrogen atom, a methyl group, or an ethyl group, and a sum of the number of carbon atoms of the chemical group represented by R1 and the number of carbon atoms of the chemical group represented by R2 is 2. R3 and R4 each represent, independently of one another, a hydrogen atom, a methyl group, or an ethyl group, and a sum of the number of carbon atoms of the chemical group represented by R3 and the number of carbon atoms of the chemical group represented by R1 is 2. A photosensitive layer of an electrophotographic photosensitive member contains at least a charge generating material, a hole transport material, and a binder resin. The hole transport material includes a compound represented by general formula (1)

公开(公告)号：US10649351B2

公开(公告)日：2020-05-12

申请号：US16472178

申请日：2017-11-30

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi Shimizu ,  Jun Azuma ,  Keiji Maruo

IPC: G03G5/00 ,  G03G5/043 ,  G03G5/05 ,  G03G5/06

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 (3c) and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin represented by general formula (1). In general formula (1), Q1, Q2, Q3, and Q4 each represent a methyl group or a hydrogen atom. r, s, t, and u each represent a number greater than or equal to 15 and less than or equal to 35. X and Y each represent a divalent group represented by chemical formula (2A), chemical formula (2B), chemical formula (2C), or chemical formula (2D)

公开(公告)号：US10372048B2

公开(公告)日：2019-08-06

申请号：US16035859

申请日：2018-07-16

Applicant: KYOCERA Document Solutions Inc.

Inventor： Jun Azuma ,  Kensuke Kojima ,  Tomofumi Shimizu

IPC: G03G5/06 ,  G03G5/05

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 charge generating material. The charge transport layer contains a hole transport material and a binder resin. The charge transport layer further contains an electron acceptor compound. The hole transport material includes a compound represented by general formula (1). In general formula (1), R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 each represent, independently of one another, a hydrogen atom or a methyl group.

公开(公告)号：US10007199B2

公开(公告)日：2018-06-26

申请号：US15248540

申请日：2016-08-26

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi Shimizu ,  Junichiro Otsubo ,  Yasuhiro Oishi

IPC: G03G5/06 ,  G03G5/10 ,  G03G5/04 ,  G03G15/00 ,  G03G5/14

CPC classification number: G03G5/0607 ,  G03G5/04 ,  G03G5/0609 ,  G03G5/0631 ,  G03G5/0696 ,  G03G5/102 ,  G03G5/144 ,  G03G15/75 ,  G03G2215/0129 ,  G03G2215/0148

Abstract: A single-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The conductive substrate contains aluminum or an aluminum alloy. A surface of the conductive substrate has an aluminum oxide film or an aluminum alloy oxide film. The photosensitive layer is disposed directly on the conductive substrate. The photosensitive layer contains an electron transport material. The electron transport material has a reduction potential of at least −0.88 V and no greater than −0.66 V versus a reference electrode (Ag/Ag+). The single-layer electrophotographic photosensitive member has a leakage onset voltage of at least 5.0 kV in a high temperature and humidity environment at a temperature of 30° C. and a relative humidity of 80%. The leakage onset voltage is a voltage applied to the single-layer electrophotographic photosensitive member at which current leakage starts.

公开(公告)号：US09541849B2

公开(公告)日：2017-01-10

申请号：US14191120

申请日：2014-02-26

Applicant: KYOCERA DOCUMENT SOLUTIONS INC.

Inventor： Tomofumi Shimizu ,  Hiroki Tsurumi ,  Yohei Yamamoto ,  Eiichi Miyamoto

IPC: G03G5/06

CPC classification number: G03G5/0609 ,  G03G5/0614 ,  G03G5/0616 ,  G03G5/0618 ,  G03G5/0651 ,  G03G5/0672

Abstract: A positively chargeable single-layer electrophotographic photosensitive member includes a single-layer photosensitive layer. The single-layer photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The electron transport material contains two or more compounds selected from the group consisting of compounds represented by the chemical formulas (1) to (4) below.

Abstract translation: 正电荷单层电子照相感光构件包括单层感光层。 单层感光层包含电荷产生材料，空穴传输材料，电子传输材料和粘合剂树脂。 电子传输材料含有选自由下列化学式（1）至（4）表示的化合物的两种或更多种化合物。

公开(公告)号：US11204561B2

公开(公告)日：2021-12-21

申请号：US16866862

申请日：2020-05-05

Applicant: KYOCERA Document Solutions Inc.

Inventor： Tomofumi Shimizu ,  Kazuaki Ezure ,  Hayase Yamamoto

IPC: G03G5/05 ,  G03G5/06 ,  G03G15/00 ,  G03G21/18

Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer of a single layer. The photosensitive layer contains a charge generating material, a binder resin, a hole transport material, and an electron transport material. The binder resin includes a polyester resin and a polycarbonate resin. The polyester resin includes a first repeating unit represented by general formula (1) shown below and a second repeating unit represented by general formula (2) shown below. The polycarbonate resin includes a third repeating unit represented by general formula (3) shown below and a fourth repeating unit represented by general formula (24) shown below. A content percentage of the polyester resin in the photosensitive layer is at least 0.3% by mass and no greater than 7.0% by mass.