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公开(公告)号：US20240280918A1
公开(公告)日：2024-08-22
申请号：US18448964
申请日：2023-08-13
发明人： Yuki OYAMADA , Masahiro IWASAKI , Yoichi KIGOSHI , Keisuke KUSANO , Kenta IDE
CPC分类号： G03G5/078 , G03G5/047 , G03G5/0696
摘要： 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 polyalkylsiloxane, and an amount of a cyclic siloxane having a molecular weight of 450 or less in the charge transport layer is less than 0.1 ppm.
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公开(公告)号：US12032318B2
公开(公告)日：2024-07-09
申请号：US18064490
申请日：2022-12-12
申请人： KONICA MINOLTA, INC.
发明人： Taiki Amemiya , Kazutoshi Kobayashi , Yukio Hosoya , Seijiro Takahashi , Tomoko Sakimura , Kazukuni Nishimura
CPC分类号： G03G15/6597 , G03G5/06147 , G03G5/061473 , G03G5/0732 , G03G5/14786 , G03G5/14791 , G03G5/14795 , G03G8/00 , G03G15/751 , G03G21/0011 , G03G2215/00518
摘要： An electrophotographic image forming system forms an electrostatic latent image on at least a photoreceptor, develops an image using an electrostatic charge image developing toner, and removes the toner using a cleaning blade. A tip ridge of the cleaning blade is pressed against a surface of the photoreceptor. The system includes a photosensitive layer of the photoreceptor and a surface protecting layer that is provided on a surface of the photosensitive layer. The surface protecting layer includes a polymerizable monomer having at least two polymerizable groups in a molecule and a polymer of a hole transporting compound having a polymerizable group represented by General formula (1). The tip ridge of the cleaning blade has an edge angle that is obtuse and less than 120° and is pressed against the surface of the photoreceptor at an effective contact angle that is in a range of 8 to 20°.
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3.发明公开公开(公告)号：US20240118633A1
公开(公告)日：2024-04-11
申请号：US18463725
申请日：2023-09-08
CPC分类号： G03G5/047 , G03G5/06144 , G03G5/06145 , G03G5/0696 , G03G21/1814
摘要： An electrophotographic photosensitive member including: a support, a charge generating layer, and a charge transporting layer in this order, wherein the charge transporting layer contains: a compound represented by the formula (A-1), and at least one selected from the group consisting of a compound represented by the formula (A-2) and a compound represented by the formula (A-3).
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公开(公告)号：US20240036487A1
公开(公告)日：2024-02-01
申请号：US18297656
申请日：2023-04-10
发明人： Ryosuke FUJII , Tomoya SASAKI , Hiroko KOBAYASHI , Yuto OKAZAKI , Kosuke NARITA
IPC分类号： G03G5/047 , G03G5/05 , G03G5/06 , C08G63/185 , G03G21/18
CPC分类号： G03G5/047 , G03G5/056 , G03G5/061446 , C08G63/185 , G03G21/1803
摘要： An electrophotographic photoreceptor includes a conductive substrate, and a lamination type photosensitive layer including a charge generation layer and a charge transport layer or a single layer type photosensitive layer that is a photosensitive layer disposed on the conductive substrate, in which the charge transport layer or the single layer type photosensitive layer is an outermost layer and contains a charge transport material, a polyester resin having a dicarboxylic acid unit (A) represented by Formula (A), and a compound that has a molecular weight of 255 or greater, has a phenol skeleton in which a primary carbon atom or a secondary carbon atom is bonded to one ortho position and a tertiary carbon atom or a quaternary carbon atom is bonded to the other ortho position, and has no linear alkylene structure having 4 or more carbon atoms.
In Formula (A), ArA1 and ArA2 each independently represent an aromatic ring that may have a substituent, LA represents a single bond or a divalent linking group, and nA1 represents 0, 1, or 2.-
公开(公告)号：US20240027927A1
公开(公告)日：2024-01-25
申请号：US18190105
申请日：2023-03-26
发明人： Masahiro IWASAKI , Yuki OYAMADA
CPC分类号： G03G5/0651 , G03G21/1814 , G03G21/1821 , G03G5/0648 , G03G9/087
摘要： An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer provided on the conductive substrate and containing a binder resin and an n-type organic pigment, and a photosensitive layer provided on the undercoat layer, in which an amount of an Fe element in the undercoat layer that is detected by high-frequency inductively coupled plasma emission spectrometric analysis is 80 ppm or less.
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公开(公告)号：US11796929B2
公开(公告)日：2023-10-24
申请号：US17338895
申请日：2021-06-04
CPC分类号： G03G5/0564 , G03G5/047 , G03G5/0609 , G03G5/061443 , G03G15/0275 , G03G15/0867
摘要： An electrophotographic photoconductor includes: a conductive substrate; and a single-layer-type photoconductive layer that is provided on the conductive substrate and contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, in which a volume resistivity of the photoconductive layer after wear is 5.0×1010 Ω·cm or more and 2.0×1011 Ω·cm or less when a ratio of a thickness of the photoconductive layer after wear to a thickness of the photoconductive layer before wear (the thickness of the photoconductive layer after wear/the thickness of the photoconductive layer before wear) is 0.8.
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7.发明授权公开(公告)号：US11796928B2
公开(公告)日：2023-10-24
申请号：US17396061
申请日：2021-08-06
发明人： Kenta Shingu , Yoshiteru Yamada , Akihiro Kawasaki , Keisuke Kusano , Kohei Hashimoto , Yuto Okazaki , Takeshi Iwanaga , Wataru Yamada , Hirohito Yoneyama
CPC分类号： G03G5/0539 , G03G5/0672 , G03G5/06144 , G03G21/1803
摘要： An electrophotographic photosensitive member includes a conductive support and a photosensitive layer disposed on the conductive support. A top surface layer of the electrophotographic photosensitive member includes fluorine-containing resin particles, a fluorine-containing dispersant, and two or more charge transporting materials. When the charge transporting materials are listed in order of decreasing HOMO energy levels, a difference in HOMO energy level between each adjacent two of the charge The ratio A of the amount of each of the charge transporting materials to the total amount of the charge transporting materials satisfies the condition 1 below,
[(100/N)−(100/N×0.3)]≤A≤[(100/N)+(100/N×0.3)] Condition 1
where N represents the number of types of the charge transporting materials included in the top surface layer.-
公开(公告)号：US20230333493A1
公开(公告)日：2023-10-19
申请号：US17945304
申请日：2022-09-15
发明人： Yuki Oyamada , Masahiro Iwasaki , Keisuke Kusano , Wataru Yamada , Tomoya Sasaki
IPC分类号： G03G5/06
CPC分类号： G03G5/0651 , G03G5/0607 , G03G5/0648 , G03G21/1814
摘要： An electrophotographic photoreceptor includes a conductive support; and an undercoat layer and a photosensitive layer stacked on the conductive support, in which the undercoat layer contains crystalline electron transport compound particles. In X-ray diffraction measurement performed on the undercoat layer in a thickness direction, a maximum intensity peak has a half-width of 5° or less, and a maximum value Nmax among orientation indices N expressed by equation (1) below is 1 or more and 3 or less:
Orientation index
=
l
1
∑
l
1
l
2
∑
l
2
(1)
where I1 represents a relative integral intensity of each of peaks in the X-ray diffraction measurement performed on the undercoat layer in the thickness direction, and I2 represents a relative integral intensity of each of peaks in X-ray diffraction measurement performed on the undercoat layer processed into a powder form having a volume-average particle diameter of 5 µm or less.-
公开(公告)号：US20230259048A1
公开(公告)日：2023-08-17
申请号：US18161328
申请日：2023-01-30
发明人： JUN OHIRA , TOSHIYASU SHIRASUNA , IKUYO KUROIWA , TSUYOSHI SHIMADA , TAKANORI UENO , KENICHI IKARI , HARUHIKO MITSUDA , RYOICHI TOKIMITSU , EILEEN TAKEUCHI
IPC分类号： G03G5/147 , C08F265/06 , G03G5/07 , G03G5/06
CPC分类号： G03G5/14791 , C08F265/06 , G03G5/071 , G03G5/06144 , G03G5/06147
摘要： The present disclosure provides an electrophotographic photosensitive member having a surface layer that is excellent in dispersibility of a fluorine atom-containing resin particle and suppresses a potential fluctuation at the time of repeated use. The electrophotographic photosensitive member having the surface layer, wherein the surface layer includes the fluorine atom-containing resin particle, a binder material, and a polymer A having a specific structural unit.
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公开(公告)号：US20230259044A1
公开(公告)日：2023-08-17
申请号：US18161113
申请日：2023-01-30
发明人： HARUHIKO MITSUDA , RYOICHI TOKIMITSU , EILEEN TAKEUCHI , JUN OHIRA , Toshiyasu Shirasuna , IKUYO KUROIWA , TSUYOSHI SHIMADA , TAKANORI UENO , KENICHI IKARI
CPC分类号： G03G5/06147 , G03G15/0233 , G03G5/0564 , G03G21/1814
摘要： The present disclosure provides an electrophotographic photosensitive member having excellent dispersibility of fluorine atom-containing resin particles, and excellent durability, with an occurrence of a ghost suppressed. In the electrophotographic photosensitive member having a surface layer, the surface layer includes a fluorine atom-containing resin particle, a binder material, a charge transport substance, and a polymer A having a specific structural unit, wherein the binder material is a thermoplastic resin, and a film thickness of the surface layer is 35 μm or larger and 50 μm or smaller.
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