Fujifilm Business Innovation Corp.

Fuji Xerox Co., Ltd.

Keisuke Kusano

Masahiro Iwasaki

Wataru Yamada

Yuto Okazaki

Taisuke Fukui

Ryosuke Fujii

Jiro Korenaga

Yukimi Kawabata

Akihiro Kawasaki

Yoichi Kigoshi

Yuki Oyamada

Kenta Shingu

Kenta Ide

Yoshifumi Shoji

Takeshi Iwanaga

Hirofumi Nakamura

Hirohito Yoneyama

Daisuke Haruyama

Kosuke Narita

Hideya Katsuhara

Yohei Saito

Shinya Yamamoto

Yu Nakamura

Yoshiteru Yamada

Satoshi Mizoguchi

Michinori Fukuma

Kohei Hashimoto

Natsumi Kaneko

Shingo Suda

Takahiro Nakamura

Shuhei Yamazaki

An image forming apparatus includes an electrophotographic photoreceptor that includes a conductive substrate, an undercoat layer provided on the conductive substrate, containing a binder resin and an electron transport material, and satisfying Expression 1-1, and a photosensitive layer provided on the undercoat layer, a charging device that charges a surface of the electrophotographic photoreceptor, an electrostatic latent image forming device that forms an electrostatic latent image on the charged surface of the 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, and a transfer device that transfers the toner image to a surface of a recording medium, in which a moving time of an outer peripheral surface of the electrophotographic photoreceptor, required from charging performed by the charging device to development performed by the developing device, is 90 msec or longer,

Image forming apparatus

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 10carbon 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.

Image forming apparatus including an electrophotographic photoreceptor

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 10carbon 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.

Image forming apparatus and process cartridge

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 10carbon 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/m, an absolute value |RP−RP| of a difference between a residual potential RPafter charging and exposure once and a residual potential RPafter charging and exposure 10,000 times is 25 V or less.

Electrophotographic photoconductor, process cartridge, and image forming apparatus

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.

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/)&#x2212;(100/&#xd7;0.3)]&#x2264;&#x2264;[(100/)+(100/&#xd7;0.3)]&#x2003;&#x2003;Condition 1

Electrophotographic photosensitive member, process cartridge, and image forming apparatus

A fluorine-containing resin particle contains 0 or more and 30 or less carboxyl groups per 10carbon atoms and 0 ppm or more and 3 ppm or less of a basic compound.

Fluorine-containing resin particle, composition, layer-shaped article, electrophotographic photoreceptor, process cartridge, and image forming apparatus

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&#xb0; C. The amount of the acidic compound relative to the outermost surface layer is 100 ppm or more and 10000 ppm or less.

Electrophotographic photoreceptor, process cartridge, and image forming apparatus

An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer on the conductive substrate. The electrophotographic photoreceptor has an outermost surface layer that contains fluorine-containing resin particles and a fluorine-containing graft polymer. The fluorine-containing resin particles contain 0 or more and 30 or less carboxy groups per 10carbon atoms. The outermost surface layer has a dielectric constant of 3.75 or more and 3.90 or less. The contact angle of pure water on the outermost surface layer is 90&#xb0; or more.

An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer on the conductive substrate. The electrophotographic photoreceptor has an outermost surface layer that contains fluorine-containing resin particles and an antioxidant. The fluorine-containing resin particles contain 0 or more and 30 or less carboxy groups per 10carbon atoms. A decrease in weight of the antioxidant when heated at 150&#xb0; C. for 10 minutes in an air atmosphere is 40 mass % or less.

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.

A dispersant attached polytetrafluoroethylene particle on whose surface a dispersant having a fluorine atom is attached has a content of perfluorooctanoic acid of from 0 ppb to 25 ppb with respect to the polytetrafluoroethylene particle, and a composition contains a polytetrafluoroethylene particle and a dispersant having a fluorine atom in which a content of perfluorooctanoic acid is from 0 ppb to 25 ppb with respect to the polytetrafluoroethylene particle.

Dispersant attached polytetrafluoroethylene particle, composition, layered material, electrophotographic photoreceptor, process cartridge, and image forming apparatus

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 fluorine-containing resin particles and a fluorine-containing graft polymer having a fluorinated alkyl group. In an infrared absorption spectrum of the fluorine-containing graft polymer, a ratio of a peak area in a wavenumber range of from 1,020 cmto 1,308 cmto a peak area in a wavenumber range of from 1,673 cmto 1,779 cmis 2.7 or more and 4.8 or less.

Electrophotographic photoreceptor, process cartridge, and image-forming apparatus

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 fluorine-containing resin particles and a fluorine-containing graft polymer having a structural unit represented by general formula (FA), a structural unit represented by general formula (FB), and a structural unit represented by general formula (FC): where R, R, R, and Reach independently represent a hydrogen atom or an alkyl group; Xrepresents an alkylene chain, a halogen-substituted alkylene chain, &#x2014;S&#x2014;, &#x2014;O&#x2014;, &#x2014;NH&#x2014;, or a single bond; Yrepresents an alkylene chain, a halogen-substituted alkylene chain, &#x2014;(CH(OH))&#x2014;, or a single bond; Qrepresents &#x2014;O&#x2014; or &#x2014;NH&#x2014;; fl, fm, and fn each independently represent an integer of 1 or more; fp, fq, fr, and fs each independently represent an integer of 0 or 1 or more; ft represents an integer of 1 or more and 7 or less; fx represents an integer of 1 or more; Rand Reach independently represent a hydrogen atom or an alkyl group; and fz represents an integer of 1 or more.

Growing community of inventors

Kanagawa, Japan

Keisuke Kusano