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    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    1.
    发明公开
    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS 审中-公开

    公开(公告)号：US20240288788A1

    公开(公告)日：2024-08-29

    申请号：US18446609

    申请日：2023-08-09

    Applicant: FUJIFILM Business Innovation Corp.

    Inventor： Yuto OKAZAKI ,  Kosuke NARITA ,  Tomoya SASAKI ,  Hiroko KOBAYASHI ,  Ryosuke FUJII

    IPC: G03G5/05 ,  G03G5/07

    CPC classification number: G03G5/056 ,  G03G5/0765 ,  C08G63/183 ,  C08G63/195 ,  G03G5/0567 ,  G03G21/1814

    Abstract: 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 a polyester resin (1) having a dicarboxylic acid unit (A) represented by Formula (A) and a diol unit (B) represented by Formula (B), and an amount of a diol represented by Formula (1) in the charge transport layer is 10 ppm or less,






    in Formula (A), n1 represents 1, 2, or 3, n1 pieces of m1's each independently represent 0, 1, 2, 3, or 4, m1 pieces of Ra1's each independently represent an alkyl group having 1 or more and 10 or less carbon atoms, an aryl group having 6 or more and 12 or less carbon atoms, or an alkoxy group having 1 or more and 6 or less carbon atoms,
    in Formula (B), Rb1 and Rb2 each independently represent a hydrogen atom, an alkyl group having 1 or more and 20 or less carbon atoms, an aryl group having 6 or more and 12 or less carbon atoms, or an aralkyl group having 7 or more and 20 or less carbon atoms, Rb3, Rb4, Rb5, Rb6, Rb7, Rb8, Rb9, and Rb10 each independently represent a hydrogen atom, an alkyl group having 1 or more and 10 or less carbon atoms, an aryl group having 6 or more and 12 or less carbon atoms, an aralkyl group having 7 or more and 20 or less carbon atoms, or an alkoxy group having 1 or more and 6 or less carbon atoms, and Rb1 and Rb2 may be bonded to each other to form a cyclic alkyl group,
    in Formula (1), R1 and R2 each independently represent a hydrogen atom, an alkyl group having 1 or more and 20 or less carbon atoms, an aryl group having 6 or more and 12 or less carbon atoms, or an aralkyl group having 7 or more and 20 or less carbon atoms, R3, R4, R5, R6, R7, R8, R9, and R10 each independently represent a hydrogen atom, an alkyl group having 1 or more and 10 or less carbon atoms, an aryl group having 6 or more and 12 or less carbon atoms, an aralkyl group having 7 or more and 20 or less carbon atoms, or an alkoxy group having 1 or more and 6 or less carbon atoms, and R1 and R2 may be bonded to each other to form a cyclic alkyl group.

    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    2.
    发明申请
    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS 有权

    公开(公告)号：US20240419091A1

    公开(公告)日：2024-12-19

    申请号：US18443216

    申请日：2024-02-15

    Applicant: FUJIFILM Business Innovation Corp.

    Inventor： Yuto OKAZAKI ,  Tomoya SASAKI ,  Ryosuke FUJII ,  Hiroko KOBAYASHI ,  Kosuke NARITA

    IPC: G03G5/05 ,  G03G5/047 ,  G03G5/06

    Abstract: An electrophotographic photoreceptor includes a conductive substrate; and a photosensitive layer disposed on the conductive substrate and including a charge generation layer and a charge transport layer, in which the charge transport layer has an average thickness of 30 μm or greater, the charge transport layer contains a polyarylate resin, and an absorption spectrum measured by peeling off the photosensitive layer and dissolving the photosensitive layer in tetrahydrofuran satisfies Expression (1) and Expression (2), Iu ≤ 0.95 × I ⁢ m Expression ⁢ ( 1 ) 1.05 × I ⁢ m ≤ I ⁢ 1 Expression ⁢ ( 2 ) in a case where a total length of the electrophotographic photoreceptor in an axial direction is defined as L, Im represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled from a center of the electrophotographic photoreceptor in the axial direction, Iu represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled at a position of 0.40 L from the center of the electrophotographic photoreceptor in the axial direction toward one end, and Il represents an absorbance of the photosensitive layer at a wavelength of 678 nm, which is peeled at a position of 0.40 L from the center of the electrophotographic photoreceptor in the axial direction toward the other end.

    IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE
    3.
    发明公开
    IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE 审中-公开

    公开(公告)号：US20240085818A1

    公开(公告)日：2024-03-14

    申请号：US18155032

    申请日：2023-01-16

    Applicant: FUJIFILM Business Innovation Corp.

    Inventor： Yoshiteru YAMADA ,  Tomoya SASAKI ,  Ryosuke FUJII ,  Hiroko KOBAYASHI ,  Yuto OKAZAKI

    IPC: G03G15/02 ,  G03G5/05 ,  G03G5/06 ,  G03G15/08 ,  G03G21/00

    CPC classification number: G03G15/0233 ,  G03G5/0567 ,  G03G5/0605 ,  G03G5/061473 ,  G03G15/0806 ,  G03G21/0011 ,  G03G2215/00518

    Abstract: An image forming apparatus includes an electrophotographic photoreceptor that has a photosensitive layer constituting a surface of the electrophotographic photoreceptor, a charging device that charges the surface of the electrophotographic photoreceptor, an electrostatic charge image forming device that forms an electrostatic charge image on the charged surface of the electrophotographic photoreceptor, a developing device that accommodates a developer containing a toner which contains toner particles and an external additive, and develops the electrostatic charge image formed on the surface of the electrophotographic photoreceptor by the developer as a toner image, a transfer device that transfers the toner image formed on the surface of the electrophotographic photoreceptor to a surface of a recording medium, and a cleaning device that includes a cleaning blade coming into contact with the surface of the electrophotographic photoreceptor and cleaning at least residual toner particles on the surface of the electrophotographic photoreceptor

    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    4.
    发明申请
    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS 有权

    公开(公告)号：US20240411236A1

    公开(公告)日：2024-12-12

    申请号：US18443235

    申请日：2024-02-15

    Applicant: FUJIFILM Business Innovation Corp.

    Inventor： Ryosuke FUJII ,  Tomoya SASAKI ,  Hiroko KOBAYASHI ,  Yuto OKAZAKI ,  Kosuke NARITA

    IPC: G03G5/05

    Abstract: 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 a polyester resin having a constitutional unit containing biphenyl represented by Formula (1), and an amount of an aromatic carboxylic acid halide in the charge transport layer is 15×10−8 mol/g or less per unit mass of the charge transport layer, in Formula (1), j represents an integer of 0 or greater and 4 or less, j pieces of R11's each independently represent a methyl group or an ethyl group, k represents an integer of 0 or greater and 4 or less, and k pieces of R12's each independently represent a methyl group or an ethyl group.

    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    6.
    发明公开
    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS 审中-公开

    公开(公告)号：US20240036487A1

    公开(公告)日：2024-02-01

    申请号：US18297656

    申请日：2023-04-10

    Applicant: FUJIFILM Business Innovation Corp.

    Inventor： Ryosuke FUJII ,  Tomoya SASAKI ,  Hiroko KOBAYASHI ,  Yuto OKAZAKI ,  Kosuke NARITA

    IPC: G03G5/047 ,  G03G5/05 ,  G03G5/06 ,  C08G63/185 ,  G03G21/18

    CPC classification number: G03G5/047 ,  G03G5/056 ,  G03G5/061446 ,  C08G63/185 ,  G03G21/1803

    Abstract: 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.

    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    7.
    发明公开
    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS 审中-公开

    公开(公告)号：US20240077809A1

    公开(公告)日：2024-03-07

    申请号：US18300348

    申请日：2023-04-13

    Applicant: FUJIFILM Business Innovation Corp.

    Inventor： Tomoya SASAKI ,  Ryosuke FUJII ,  Hiroko KOBAYASHI ,  Yuto OKAZAKI ,  Kosuke NARITA

    IPC: G03G5/05 ,  G03G5/047 ,  G03G21/18

    CPC classification number: G03G5/056 ,  G03G5/047 ,  G03G5/0564 ,  G03G21/1814

    Abstract: 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 a charge transport material, at least one of a polyester resin (PEz) or a polycarbonate resin (PCz) that has at least one of a structure (Z1) represented by Formula (Z1) or a structure (Z2) represented by Formula (Z2) at at least one terminal, and a resin (X) that has at least one of a unit (X1) represented by Formula (X1) or a unit (X2) represented by Formula (X2), a mass proportion of the resin (X) in a total amount of the polyester resin (PEz), the polycarbonate resin (PCz), and the resin (X) in the charge transport layer is 0.5% by mass or greater and 30% by mass or less, and the charge transport layer has an average thickness of greater than 30 μm and less than 50 μm,






    in Formula (Z1), Ar1 represents an aromatic ring that may have a substituent,
    in Formula (Z2), Ar2 represents an aromatic ring that may have a substituent,










    in Formula (X1), R101, R102, and R103 each independently represent a hydrogen atom or an alkyl group having 1 or more and 5 or less carbon atoms, L101 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, —O—, —C(═O)—, —C(═O)O—, an aromatic ring that may have a substituent, or a combination thereof, L102 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, —O—, —C(═O)—, —C(═O)O—, or a combination thereof, R104 and R105 each independently represent an alkyl group having 1 or more and 5 or less carbon atoms, n represents an integer of 0 or greater and 300 or less, R106, R107, and R108 each independently represent an alkyl group having 1 or more and 5 or less carbon atoms or —O—[Si(R109)(R110)O]m—Si(R111)(R112)(R113), R109, R110, R111, R12, and R113 each independently represent an alkyl group having 1 or more and 5 or less carbon atoms, and m represents an integer of 0 or greater and 20 or less,
    in Formula (X2), R201, R202, and R203 each independently represent a hydrogen atom or an alkyl group having 1 or more and 5 or less carbon atoms, L201 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, —O—, —C(═O)—, —C(═O)O—, an aromatic ring that may have a substituent, or a combination thereof, L202 represents a single bond, an alkylene group having 1 or more and 5 or less carbon atoms, —O—, —C(═O)—, —C(═O)O—, or a combination thereof, and R204 is an alkyl group having 6 or more and 30 or less carbon atoms.

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