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    ELECTROPHOTOGRAPHIC PHOTORECEPTOR, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    1.
    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
    3.
    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
    4.
    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
    5.
    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

    PARTICLE-DISPERSED POLYIMIDE PRECURSOR SOLUTION, METHOD FOR PRODUCING POROUS POLYIMIDE FILM, AND POROUS POLYIMIDE FILM
    6.
    发明申请
    PARTICLE-DISPERSED POLYIMIDE PRECURSOR SOLUTION, METHOD FOR PRODUCING POROUS POLYIMIDE FILM, AND POROUS POLYIMIDE FILM 有权

    公开(公告)号：US20220119596A1

    公开(公告)日：2022-04-21

    申请号：US17380016

    申请日：2021-07-20

    Applicant: FUJIFILM Business Innovation Corp.

    Inventor： Tomoya SASAKI ,  Hidekazu HIROSE ,  Kosaku YOSHIMURA ,  Yasunobu KASHIMA ,  Hajime SUGAHARA ,  Kosuke NAKADA ,  Tomoyo OKUBO

    IPC: C08G73/10 ,  C08J5/18 ,  C08J9/26

    Abstract: A particle-dispersed polyimide precursor solution contains a polyimide precursor having a unit represented by the following formula (I), particles, and a solvent, in which the particle-dispersed polyimide precursor solution satisfies both the following conditions (1) and (2), (in the formula (I), A represents a tetravalent organic group, and B represents a divalent organic group represented by any of the following formulas (B1) to (B4)), (in the formulas (B1) to (B4), Ar1, Ar10, and Ar11 each independently represent a trivalent aromatic group which may have a substituent, Ar2, Ar4, Ar5, Ar7 and Ar8 each independently represent a divalent aromatic group which may have a substituent, Ar3 and Ar6 each independently represent a tetravalent aromatic group which may have a substituent or a group represented by the following formula (II), Ar9 represents a divalent aromatic group which may have a substituent or a group represented by the following formula (III), X1 to X7 each independently represent NRa, O, or S, Ra represents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group, and * represents a bonding site with an adjacent linking group), and (in the formulas (II) and (III), Ar12 and Ar13 each independently represent a trivalent aromatic group which may have a substituent, Ar14 and Ar15 each independently represent a divalent aromatic group which may have a substituent, Y and Z each independently represent O, S, S(═O)2, or CRbRc, Rb and Rc each independently represent a hydrogen atom, an alkyl group which may have a substituent, or an aryl group, and * represents a bonding site with an adjacent linking group), Condition (1): a total content of the groups represented by the formulas (B1) to (B4) is 1% by mass or more and 40% by mass or less with respect to a total amount of the polyimide precursor, and
    Condition (2): a content of the particles is 5% by mass or more and 90% by mass or less with respect to a total content of the polyimide precursor and the particles.

    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：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.

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