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1.发明公开公开(公告)号：US20240192614A1
公开(公告)日：2024-06-13
申请号：US18516883
申请日：2023-11-21
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tomofumi SHIMIZU , Makoto SHISHIDO
CPC classification number: G03G5/056 , G03G5/0596 , G03G5/061446 , G03G5/0672 , G03G15/75
Abstract: A photosensitive layer of an electrophotographic photosensitive member is a single layer and contains a charge generating material, a binder resin, an electron transport material, a hole transport material, and resin particles. The binder resin includes a polyarylate resin. The polyarylate resin includes repeating units represented by formulas (1), (2), (3), and (4).
The repeating unit (3) has a percentage content of greater than 0% and less than 50% to the total number of repeats of the repeating units (1) and (3). The repeating unit (4) has a percentage content of at least 35% and less than 70% to the total number of repeats of the repeating units (2) and (4).-
公开(公告)号：US20210286277A1
公开(公告)日：2021-09-16
申请号：US17199561
申请日：2021-03-12
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tomofumi SHIMIZU
Abstract: The undercoat layer contains metal particles and a polyamide resin. The metal particle has a core and a coat layer covering at least a part of the core. The core contains titanium oxide. The coat layer contains at least a metal oxide different from titanium oxide. The metal oxide different from the titanium oxide is located on the outermost surface of the metal particles. The polyamide resin has an amide bond and an alkylene group. The absorption rate of the first peak derived from the amide bond to the second peak derived from the alkylene group to the first absorbance measured by infrared spectroscopy is ≥0.70.
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3.发明申请公开(公告)号：US20200174386A1
公开(公告)日：2020-06-04
申请号：US16632239
申请日：2018-06-26
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tomofumi SHIMIZU
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.
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4.发明申请公开(公告)号：US20180299797A1
公开(公告)日：2018-10-18
申请号：US15948825
申请日：2018-04-09
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tomofumi SHIMIZU , Jun AZUMA
CPC classification number: G03G5/0567 , G03G5/056 , G03G5/0564 , G03G5/0603 , G03G5/0607 , G03G5/0609 , G03G5/0612 , G03G5/0618 , G03G5/0631 , G03G5/0653 , G03G5/0677
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.
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公开(公告)号：US20180246424A1
公开(公告)日：2018-08-30
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
CPC classification number: G03G5/0589 , C08G63/672 , C08G63/6826 , C08G63/916 , G03G5/047 , G03G5/056 , G03G5/0614 , G03G5/0668 , G03G5/0672 , G03G2215/00957
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.
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Patent Agency Ranking
公开(公告)号：US20190354028A1
公开(公告)日：2019-11-21
申请号：US16401401
申请日：2019-05-02
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tomofumi SHIMIZU , Jun AZUMA
Abstract: A method of manufacturing an electrographic photoreceptor provided with a conductive substrate and a single-layered photosensitive layer is disclosed. The method includes: directly or indirectly applying a coating liquid for photosensitive layer formation onto the conductive substrate, the coating liquid containing a solvent, a charge generating agent, a binder resin, a hole transport material and an electron transport material; and removing part of the solvent to form the single-layered photosensitive layer. The solvent includes a first solvent as an alcohol with 1 to 3 carbon atoms and a second solvent as a solvent other than the first solvent. The binder resin includes a polyarylate resin as a polymerized product of monomers including a first monomer represented by General Formula (1) below and a second monomer represented by General Formula (2) below. The electron transport material includes a compound represented by General Formula (31), (32), (33) or (34) below.
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公开(公告)号：US20190025720A1
公开(公告)日：2019-01-24
申请号：US16035859
申请日：2018-07-16
Applicant: KYOCERA Document Solutions Inc.
Inventor： Jun AZUMA , Kensuke KOJIMA , Tomofumi SHIMIZU
CPC classification number: G03G5/0618 , G03G5/0546 , G03G5/056 , G03G5/0564 , G03G5/0607 , G03G5/0609 , G03G5/0614 , G03G5/0651 , G03G5/0677
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.
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8.发明申请公开(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
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.
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9.发明申请公开(公告)号：US20180046101A1
公开(公告)日：2018-02-15
申请号：US15667678
申请日：2017-08-03
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tomofumi SHIMIZU , Keiji MARUO , Jun AZUMA
CPC classification number: G03G5/056 , G03G5/0596 , G03G5/0605 , G03G5/0607 , G03G5/0609 , G03G5/0614 , G03G5/0618 , G03G5/0631 , G03G5/0637 , G03G5/0646 , G03G15/75 , G03G21/1814
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 (1). The polyarylate resin is represented by general formula (1). 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.
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10.发明公开公开(公告)号：US20240201607A1
公开(公告)日：2024-06-20
申请号：US18518404
申请日：2023-11-22
Applicant: KYOCERA Document Solutions Inc.
Inventor： Tomofumi SHIMIZU , Makoto SHISHIDO
CPC classification number: G03G5/056 , G03G5/0609 , G03G5/0618 , G03G5/0672 , G03G15/75
Abstract: A photosensitive layer being a single layer of an electrophotographic photosensitive member contains a charge generating material, a binder resin, an electron transport material, and a hole transport material. The binder resin includes a polyarylate resin. The polyarylate resin includes repeating units represented by formulas (1), (2), (3), and (4).
The repeating unit (3) has a percentage content of greater than 0% and less than 50% to a total number of repeats of the repeating units (1) and (3). The repeating unit (4) has a percentage content of at least 35% and less than 70% to a total number of repeats of the repeating units (2) and (4).
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