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公开(公告)号：US20230266683A1
公开(公告)日：2023-08-24
申请号：US18171367
申请日：2023-02-19
Applicant: FUJIFILM Business Innovation Corp.
Inventor： Ryosuke Fujii , Tomoya Sasaki , Hiroko Kobayashi , Kohei Hashimoto , Yuto OKazaki , Kosuke Narita
CPC classification number: G03G5/0517 , G03G5/061443 , G03G5/06147 , G03G5/056 , G03G5/0564 , G03G15/75
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 that has a constitutional unit having an aromatic ring or a polycarbonate resin that has a constitutional unit having an aromatic ring, and a compound (1) represented by Formula (1) and having a melting point of 40° C. or higher,
in Formula (1), Ar represents an aromatic ring that may have a substituent, L represents a single bond, an oxygen atom, or a sulfur atom, R represents an alkyl group having 1 or more and 10 or less carbon atoms, an aryl group having 6 or more and 20 or less carbon atoms, or an aralkyl group having 7 or more and 20 or less carbon atoms, and n represents an integer of 1 or greater.-
Patent Agency Ranking
公开(公告)号：US20230280668A1
公开(公告)日：2023-09-07
申请号：US18178538
申请日：2023-03-06
Applicant: FUJIFILM Business Innovation Corp.
Inventor： Tomoya SASAKI , Kohei Hashimoto , Ryosuke Fujii , Hiroko Kobayashi , Yuto Okazaki , Kosuke Narita
CPC classification number: G03G5/047 , G03G5/056 , G03G21/1803
Abstract: An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer disposed on the conductive substrate, and a lamination type photosensitive layer disposed on the undercoat layer and including a charge generation layer and a charge transport layer, in which the charge transport layer contains a charge transport material and a polyester resin, and in a case where an average thickness of the charge transport layer is defined as As (μm) and an average thickness of the undercoat layer is defined as Bs (μm), expressions 27≤As≤50, 10≤Bs≤40, and 0.70≤As/Bs≤4.80 are satisfied.
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公开(公告)号：US20230266684A1
公开(公告)日：2023-08-24
申请号：US18171369
申请日：2023-02-19
Applicant: FUJIFILM Business Innovation Corp.
Inventor： Kosuke NARITA , Tomoya Sasaki , Ryosuke Fujii , Kohei Hashimoto , Hiroko Kobayashi , Yuto Okazaki
CPC classification number: G03G5/056 , G03G5/0564 , G03G5/061443 , G03G5/06147 , G03G5/144 , G03G15/0233 , G03G15/75
Abstract: An image forming unit includes a photoreceptor and a charging member that comes into contact with a surface of the photoreceptor and charges the photoreceptor, in which the 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, the charge transport layer contains at least one of a polyester resin that has a constitutional unit having an aromatic ring or a polycarbonate resin that has a constitutional unit having an aromatic ring, the charging member includes a support member and an elastic layer disposed on the support member, and the elastic layer has a storage elastic modulus G′ of 5.0 MPa or less at a frequency of 100 Hz in dynamic viscoelasticity measurement under a temperature condition of 24° C.
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4.发明申请公开(公告)号：US20220308473A1
公开(公告)日：2022-09-29
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
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.
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5.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
Applicant: FUJIFILM Business Innovation Corp.
Inventor： Kenta Shingu , Yoshiteru Yamada , Akihiro Kawasaki , Keisuke Kusano , Kohei Hashimoto , Yuto Okazaki , Takeshi Iwanaga , Wataru Yamada , Hirohito Yoneyama
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：US20230288847A1
公开(公告)日：2023-09-14
申请号：US18180810
申请日：2023-03-08
Applicant: FUJIFILM Business Innovation Corp.
Inventor： Hiroko Kobayashi , Tomoya Sasaki , Kohei Hashimoto , Ryosuke Fujii , Yuto Okazaki , Kosuke Narita
CPC classification number: G03G15/18 , G03G15/1605 , G03G15/6597 , G03G9/08733 , G03G21/1821 , G03G15/0233 , G03G15/0121
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 this order, in which the charge transport layer contains at least one resin selected from a polyester resin or a polycarbonate resin, and in a case where a Martens hardness and an indentation hardness, which are acquired by an indentation test performed on the charge transport layer to a depth of 0.5 μm, are respectively defined as HM (N/mm2) and nIT (N/mm2), Relational Equation (0) is satisfied, an elastic deformation modulus is 45% or greater and 70% or less, and a tensile elastic modulus of the charge transport layer is 2,300 MPa or greater and 5,000 MPa or less,
nIT=a×HM−b(a=2±0.2,b=100±20). (0)
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