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1.发明申请公开(公告)号：US20230097281A1
公开(公告)日：2023-03-30
申请号：US17815537
申请日：2022-07-27
摘要： An electrophotographic photosensitive member includes a conductive substrate and an at-least-one-layer photosensitive layer including a specific photosensitive layer. The specific photosensitive layer contains a charge generating material, a binder resin, an electron transport material, and a hole transport material. The binder resin includes a polyarylate resin. The polyarylate resin includes repeating units (1), (2), (3), and (4). A percentage of the number of repeats of the repeating unit (3) relative to a total number of repeats of the repeating units (1) and (3) is greater than 0% and less than 50%. A percentage of the number of repeats of the repeating unit (4) relative to a total number of repeats of the repeating units (2) and (4) is at least 35% and less than 70%. The electron transport material includes a compound represented by formula (11), (12), (13), (14), (15), (16), or (17):
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2.发明授权公开(公告)号：US11599034B2
公开(公告)日：2023-03-07
申请号：US17150603
申请日：2021-01-15
摘要： An electrophotographic photosensitive member that has an electroconductive support and a photosensitive layer on the electroconductive support, and reduces image failures. The surface layer of the electrophotographic photosensitive member includes a cured product of a composition of: a charge transporting compound having a specific polymerizable functional group; a polytetrafluoroethylene particle having a specific primary particle diameter; and a polymer having specific structural units and having weight average molecular weight.
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3.发明申请公开(公告)号：US20220397835A1
公开(公告)日：2022-12-15
申请号：US17664997
申请日：2022-05-25
发明人： Tomofumi SHIMIZU , Makoto Shishido
摘要： A single-layer photosensitive layer included in an electrophotographic photosensitive member contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin. The polyarylate resin includes repeating units represented by formulas (1), (2), (3), and (4). The percentage of the number of repeats of the repeating unit represented by formula (3) relative to a total of the number of repeats of the repeating unit represented by formula (1) and the number of repeats of the repeating unit represented by formula (3) is greater than 0% and less than 20%.
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公开(公告)号：US11506988B2
公开(公告)日：2022-11-22
申请号：US17209503
申请日：2021-03-23
发明人： Koji Takahashi
摘要： Provided is an electrophotographic photosensitive member, which has high abrasion resistance and is resistant to being deeply flawed. Specifically, provided is an electrophotographic photosensitive member comprising a support and a surface layer formed on the support, wherein the surface layer comprises at least inorganic particles having pores in surfaces thereof, wherein at least a resin in the surface layer penetrates the pores, and wherein when vibration having a frequency of 0.5 Hz is applied to the surface layer at 28° C., the loss tangent tan δ of the dynamic viscoelasticity of the surface layer is from 0.005 to 0.05.
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公开(公告)号：US11307509B2
公开(公告)日：2022-04-19
申请号：US17070995
申请日：2020-10-15
发明人： Tetsuo Hino , Yasuhiro Fushimoto , Norifumi Muranaka , Masafumi Kyogaku , Masaki Yamada , Hiroshi Inoue , Takumi Furukawa , Hiroaki Watanabe , Kenya Terada , Yuya Tomomizu , Toshimitsu Nakazawa
摘要： An electro-conductive layer of an electrophotographic electro-conductive member has a matrix-domain structure. The matrix contains a first rubber. The domain contains a second rubber and electro-conductive particles. Where μ represents an average of ratios of the cross-sectional area of the electro-conductive particles contained in each of the domains to the cross-sectional area of each of the domains appearing on a cross-section of the electro-conductive layer in a thickness direction, and σ represents a standard deviation of the ratios, σ/μ is 0 or more and 0.4 or less, and μ is 20% or more and 40% or less. At least eight of samples with a first cubic shape 9 μm on a side, which are sampled at arbitrary nine positions on the electro-conductive layer, satisfy the specified condition.
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6.发明申请公开(公告)号：US20220100110A1
公开(公告)日：2022-03-31
申请号：US17481401
申请日：2021-09-22
发明人： Yuko IWASHITA , Kazunari HAMASAKI
摘要： An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single layer, and contains a charge generating material, an electron transport material, a binder resin, and a hole transport material. The electron transport material includes a compound represented by general formula (1). The binder resin includes a polycarbonate resin having an end group and a main chain represented by general formula (10).
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公开(公告)号：US11269263B2
公开(公告)日：2022-03-08
申请号：US16062442
申请日：2016-12-16
摘要： A bischloroformate composition is represented by a formula (1) below, contains a plurality of Ar components, and has an average number of monomer units (m1), which is calculated by an expression (Numerical Expression 1) below, ranging from 1.0 to 1.99. The plurality of Ar components are each independently Ar1 or Ar2. The plurality of Ar components include at least one Ar1 and at least one Ar2. Ar1 is a group represented by a formula (2) below. Ar2 is a group represented by a formula (3) below. A molar composition ratio represented by Ar1/(Ar1+Ar2) ranges from 45 mol % to 99 mol %. average number of monomer units (m1)=1+(Mav−M1)/M2 (Numerical Expression 1)
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公开(公告)号：US11249406B2
公开(公告)日：2022-02-15
申请号：US16877795
申请日：2020-05-19
摘要： Shaping a photoconductive drum includes preparing a dispersion having a charge generation composition and dipping an elongated support element into the dispersion. Withdrawing from the dispersion portions of the support element at different speeds results in different thicknesses of charge generation composition on the support element. Faster withdrawal results in thicker charge generation composition than does slower withdrawal. Portions with thicker composition provide denser optical densities compared to thinner composition allowing tailoring the photoconductive drum to compensate for imperfect optical scanning systems. Coating the support element with a charge transport layer occurs next, then curing. Oxidation of the support element may occur prior to application of the charge generation composition. A protective overcoat may also exist over the charge transport layer.
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公开(公告)号：US20220026820A1
公开(公告)日：2022-01-27
申请号：US17498346
申请日：2021-10-11
摘要： A photoconductive drum includes an elongated support element with a shaped charge generation layer. The layer extends from the support element at a single thickness along about two-thirds of a length thereof. Thicker charge generation portions provides denser optical densities compared to thinner portions allowing tailoring the photoconductive drum to compensate for imperfect optical scanning systems. A charge transport layer overcoats the charge generation layer. Optionally, an oxidation layer underlies the charge generation layer as does a protective overcoat overlying the charge transport layer.
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公开(公告)号：US20210405548A1
公开(公告)日：2021-12-30
申请号：US17338895
申请日：2021-06-04
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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