公开(公告)号：US20230251585A1

公开(公告)日：2023-08-10

申请号：US17902401

申请日：2022-09-02

Applicant: Fujifilm Business Innovation Corp.

Inventor： Masahiro IWASAKI ,  Yuki Oyamada ,  Keisuke Kusano ,  Wataru Yamada

IPC: G03G5/05 ,  G03G5/14 ,  G03G5/06 ,  G03G21/18

CPC classification number: G03G5/056 ,  G03G5/142 ,  G03G5/06142 ,  G03G5/06144 ,  G03G21/1814

Abstract: An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer on the conductive substrate, and a photosensitive layer on the undercoat layer, in which the undercoat layer is formed of a cured product of a composition that contains a reactive group-containing triarylamine compound, a curing agent, and an electron transport material and that has a butyral resin content of 0 mass % or more and 5 mass % or less relative to all solid components in the undercoat layer.

公开(公告)号：US12019393B2

公开(公告)日：2024-06-25

申请号：US17397215

申请日：2021-08-09

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Jiro Korenaga ,  Shuhei Yamazaki ,  Satoshi Mizoguchi ,  Yoichi Kigoshi ,  Michinori Fukuma ,  Kosuke Narita ,  Masahiro Iwasaki ,  Keisuke Kusano

IPC: G03G21/16 ,  G03G5/047 ,  G03G5/05 ,  G03G5/07 ,  G03G21/18 ,  B82Y20/00 ,  B82Y30/00 ,  B82Y40/00

CPC classification number: G03G5/07 ,  G03G5/047 ,  G03G5/0525 ,  G03G21/1814 ,  B82Y20/00 ,  B82Y30/00 ,  B82Y40/00

Abstract: An electrophotographic photoconductor includes a conductive substrate, and a photoconductive layer, in which an outermost surface layer contains a binder resin, a charge transporting material, fluorine-containing resin particles, and an acidic compound, the number of carboxyl groups in the fluorine-containing resin particles is 0 or more and 30 or less per 106 carbon atoms of the fluorine-containing resin particles, and in a case where charging and exposure of the electrophotographic photoconductor are repeated 10,000 times under conditions of a charging potential of −700 V and an exposure intensity of 5 mJ/m2, an absolute value |RP1−RP10000| of a difference between a residual potential RP1 after charging and exposure once and a residual potential RP10000 after charging and exposure 10,000 times is 25 V or less.

公开(公告)号：US11693329B2

公开(公告)日：2023-07-04

申请号：US17523292

申请日：2021-11-10

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Wataru Yamada ,  Masahiro Iwasaki ,  Ryosuke Fujii ,  Keisuke Kusano ,  Yuto Okazaki ,  Taisuke Fukui

IPC: G03G5/07 ,  C08F114/26 ,  G03G5/05 ,  C08L27/20 ,  C08L27/12 ,  C08L27/14 ,  C08L27/16 ,  C08L27/18 ,  C08K5/16 ,  C08K5/17 ,  G03G21/18 ,  G03G15/00

CPC classification number: G03G5/071 ,  C08F114/26 ,  C08K5/16 ,  C08K5/17 ,  C08L27/12 ,  C08L27/14 ,  C08L27/16 ,  C08L27/18 ,  C08L27/20 ,  G03G5/056 ,  G03G15/75 ,  G03G21/1803

Abstract: A fluorine-containing resin particle contains 0 or more and 30 or less carboxyl groups per 106 carbon atoms and 0 ppm or more and 3 ppm or less of a basic compound.

公开(公告)号：US11796928B2

公开(公告)日：2023-10-24

申请号：US17396061

申请日：2021-08-06

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Kenta Shingu ,  Yoshiteru Yamada ,  Akihiro Kawasaki ,  Keisuke Kusano ,  Kohei Hashimoto ,  Yuto Okazaki ,  Takeshi Iwanaga ,  Wataru Yamada ,  Hirohito Yoneyama

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

CPC classification number: G03G5/0539 ,  G03G5/0672 ,  G03G5/06144 ,  G03G21/1803

Abstract: 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

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Yuki Oyamada ,  Masahiro Iwasaki ,  Keisuke Kusano ,  Wataru Yamada ,  Tomoya Sasaki

IPC: G03G5/06

CPC classification number: G03G5/0651 ,  G03G5/0607 ,  G03G5/0648 ,  G03G21/1814

Abstract: 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：US11526092B2

公开(公告)日：2022-12-13

申请号：US15931691

申请日：2020-05-14

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Masahiro Iwasaki ,  Wataru Yamada ,  Keisuke Kusano ,  Yuto Okazaki ,  Taisuke Fukui

IPC: G03G5/147 ,  G03G15/00 ,  G03G21/18

Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer on the conductive substrate. The outermost surface layer of the electrophotographic photoreceptor contains fluorine-containing resin particles, a fluorine graft polymer, and an acidic compound having an acid dissociation constant (pKa) of 3 or less in water at 25° C. The amount of the acidic compound relative to the outermost surface layer is 100 ppm or more and 10000 ppm or less.

公开(公告)号：US11099492B2

公开(公告)日：2021-08-24

申请号：US16744210

申请日：2020-01-16

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Keisuke Kusano ,  Wataru Yamada ,  Masahiro Iwasaki ,  Ryosuke Fujii ,  Yuto Okazaki ,  Taisuke Fukui

IPC: G03G5/05 ,  G03G5/147 ,  G03G15/00 ,  G03G21/18

Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer disposed on the conductive substrate. An outermost surface layer of the electrophotographic photoreceptor contains a fluorine-containing resin particle and a fluorine-based graft polymer having a fluorinated alkyl group. A ratio of an amount of a fluorine-based graft polymer separated from the fluorine-containing resin particle to a total amount of the fluorine-based graft polymer in the outermost surface layer is 15% or less.

公开(公告)号：US12189315B2

公开(公告)日：2025-01-07

申请号：US18240792

申请日：2023-08-31

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Keisuke Kusano ,  Masahiro Iwasaki ,  Yoichi Kigoshi ,  Yuki Oyamada ,  Kenta Ide

IPC: G03G15/00 ,  G03G9/087 ,  G03G15/02 ,  G03G21/00

Abstract: An image forming apparatus includes an electrophotographic photoreceptor that has an outermost surface layer containing fluorine-containing resin particles, a charge transport material, and a binder resin, in which the number of carboxy groups contained in the fluorine-containing resin particles is 0 or greater and 30 or less per 106 carbon atoms, and the outermost surface layer has a tan δ of 0.025 or greater and 0.030 or less, a charging device that comes into direct contact with the electrophotographic photoreceptor and applies only a DC voltage to charge the electrophotographic photoreceptor, an electrostatic latent image forming device that forms an electrostatic latent image on a surface of the charged electrophotographic photoreceptor, a developing device that develops the electrostatic latent image formed on the surface of the electrophotographic photoreceptor with a developer containing a toner to form a toner image, a transfer device that transfers the toner image by bringing the electrophotographic photoreceptor and a medium to be transferred into direct contact with each other, and a cleaning device that cleans the surface of the electrophotographic photoreceptor.

公开(公告)号：US20240118653A1

公开(公告)日：2024-04-11

申请号：US18180902

申请日：2023-03-09

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Keisuke Kusano ,  Wataru Yamada ,  Masahiro Iwasaki ,  Akihiro Kawasaki ,  Yuki Oyamada

IPC: G03G15/00 ,  G03G9/087 ,  G03G15/01 ,  G03G15/02 ,  G03G15/04 ,  G03G15/16

CPC classification number: G03G15/6597 ,  G03G9/0872 ,  G03G15/0121 ,  G03G15/0233 ,  G03G15/04036 ,  G03G15/1685

Abstract: An image forming apparatus includes an electrophotographic photoreceptor that includes a conductive substrate and a photosensitive layer disposed on the conductive substrate, the electrophotographic photoreceptor having an outermost surface layer that contains a binder resin, a charge-transporting material, and a fluorine-containing resin particle, the fluorine-containing resin particle containing 0 or more and 30 or less carboxy groups per 106 carbon atoms, a charging device that charges the electrophotographic photoreceptor, an electrostatic latent image forming device that forms an electrostatic latent image on the electrophotographic photoreceptor that is charged, a developing device that houses a developer containing a toner and that develops, with the developer, the electrostatic latent image formed on the electrophotographic photoreceptor into a toner image, a transfer device that transfers the toner image onto a transfer-receiving medium, and an optical discharging device that, after the toner image is transferred onto the transfer-receiving medium and before the electrophotographic photoreceptor is charged, irradiates the electrophotographic photoreceptor with discharging light with a light quantity of 1.0 μW or more and 50.0 μW or less to perform discharging.

公开(公告)号：US11853004B2

公开(公告)日：2023-12-26

申请号：US17374673

申请日：2021-07-13

Applicant: FUJIFILM Business Innovation Corp.

Inventor： Yukimi Kawabata ,  Keisuke Kusano ,  Hideya Katsuhara ,  Natsumi Kaneko

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

CPC classification number: G03G5/061443 ,  G03G5/0564 ,  G03G5/0609 ,  G03G5/0696 ,  G03G21/1803

Abstract: An electrophotographic photoconductor includes: a conductive substrate; and a single-layer-type photoconductive layer that is provided on the conductive substrate, contains a binder resin, a charge generating material, a hole transporting material, and an electron transporting material, and has an index A represented by the following equation (1) in a range of −7.98 or more and −7.28 or less, Equation (1): A=(0.057×M)−(0.002×F)−(0.252×μ), in which, in the equation (1), M represents a Martens hardness of the single-layer-type photoconductive layer, F represents a Young's modulus of the single-layer-type photoconductive layer, and μ represents an elastic deformation ratio of the single-layer-type photoconductive layer.