Konica Minolta, Inc.

Konica Minolta Business Technologies, Inc.

Seisuke Maeda

Takeshi Ishida

Toshiyuki Fujita

Kazuhiro Kuramochi

Seijiro Takahashi

Masahiko Kurachi

Hirofumi Hayata

Kazunori Kurimoto

Kuniaki Kashiwakura

Hokuto Hatano

Hiroki Takao

Morio Osada

Provided is an image forming method using a toner for developing an electrostatic charge image and an electrophotographic photoreceptor, and containing at least a charging step, an exposing step, a developing step and a transferring step, wherein the electrophotographic photoreceptor has a photosensitive layer, and the photosensitive layer contains a triphenylamine derivative having a specific structure as a charge transport material, and the toner for developing an electrostatic charge image contains at least titanic acid compound particles as an external additive.

Image forming method and image forming system

An image forming apparatus includes: a transferer that transfers a toner image formed on a surface of a photo-conductor onto an image carrier; and an irradiator that irradiates the surface of the photo-conductor before transfer with light such that a potential of an image area where the toner image has been formed and a potential of a non-image area where the toner image has not been formed in the photo-conductor before transfer satisfy formula (1):0&#x2264;||&#x2264;200 [V]&#x2003;&#x2003;(1)

Image forming apparatus having an irradiator irradiating a photoconductor

Provided is an electrophotographic photoreceptor obtained by laminating a photosensitive layer and a surface protective layer in this order on a conductive support, wherein the surface protective layer contains conductive fine particles and crosslinkable organic fine particles, and either the conductive fine particles or the crosslinkable organic fine particles have been subjected to surface modification with a fluoroalkyl (meth)acrylate/(meth)acrylic acid copolymer.

Electrophotographic photoreceptor and electrophotographic image forming device

An electrophotographic photoreceptor has a charge generating layer, a charge transporting layer, and an outermost surface layer laminated in this order on a conductive support, wherein the outermost surface layer contains composite structural particles obtained by coating inorganic particles with oxygen-deficient conductive tin oxide, and the composite structural particles have an L value of 80 to 95, and primary particles thereof have an average particle diameter of 35 to 200 nm.

Electrophotographic photoreceptor

An electrophotographic image forming apparatus includes: an electrophotographic photosensitive body including an electroconductive substrate, and a charge generating layer, a charge transfer layer and a surface protective layer laminated on the substrate in this order, and a charging roller for causing contact electrification on the surface of the electrophotographic photosensitive body, wherein at least the surface protective layer contains inorganic microparticles having a fluorine compound on the surfaces and a binder resin, and the surface of the charging roller has a maximum height roughness Rz&#x2264;0.5 &#x3bc;m.

Electrophotographic image forming apparatus

In an electrophotographic photoreceptor, an electric charge generating layer and an electric charge transport layer are laminated on a conductive support body in this order, a layer configuring an outermost surface of the electrophotographic photoreceptor contains composite structure particles in which a core material is inorganic particles, and the inorganic particles are coated with tin oxide doped with aluminum, and an average particle diameter of primary particles of the composite structure particles is 50 nm to 200 nm.

Provided is an electrographic photoconductor resistant to surface discharge and having good wear resistance. The electrographic photoconductor has a conductive support and a photosensitive layer disposed on the conductive support, the photosensitive layer containing a charge generation material and a charge transport material. A layer forming the surface of the electrographic photoconductor contains a resin binder forming the layer and a layered carbide dispersed in the resin binder. The layer forming the surface has a light transmittance in the range of 20 to 98% at a wavelength of 350 to 800 nm.

Electrophotographic photoconductor and image forming apparatus

An electrophotographic photoreceptor includes: a conductive support; and a photosensitive layer which contains an electric charge generating material and an electric charge transport material, wherein a layer configuring a surface of the electrophotographic photoreceptor contains a resin binder, and conductive particles A and B dispersed in the resin binder, the conductive particles A have a single peak and volume resistance &#x3c1;1, the conductive particles B have a single peak and volume resistance &#x3c1;2, when a particle diameter of the conductive particles A is set to d1, and a particle diameter of the conductive particles B is set to d2, Expression (1) is satisfied, and when the volume resistance of the conductive particles A is set to &#x3c1;1, and the volume resistance of the conductive particles B is set to &#x3c1;2, Expression (2) is satisfied:4&#xd7;2&#x2264;1&#x2264;20&#xd7;2&#x2003;&#x2003;(1)10&#xd7;&#x3c1;1&#x3c;&#x3c1;2&#x2003;&#x2003;(2).

Electrophotographic photoreceptor and image forming apparatus

Provided is an electrophotographic photoreceptor containing a conductive support having thereon a photosensitive layer and a surface layer laminated in that order, wherein the surface layer contains a conductive filler having a number average primary particle size of 10 to 500 nm in a resin; and the conductive filler is treated with a surface treatment agent containing a fluoroalkyl (meth)acrylate/(meth)acrylic acid copolymer.

Disclosed is an electrophotographic photoreceptor including a conductive support, a photosensitive layer on the conductive support and a surface layer on the photosensitive layer. The surface layer includes a cured resin prepared by polymerization of a compound having two or more radically polymerizable functional groups per molecule, the cured resin containing an organic resin fine particle and a metal oxide fine particle, and the organic resin fine particle comprising a resin containing a structural unit derived from at least one of melamine and benzoguanamine, the organic resin fine particle having a number average primary particle size of 0.01 to 3.00 &#x3bc;m.

Electrophotographic photoreceptor, manufacturing method of electrophotographic photoreceptor, image-forming apparatus and image-forming method

An organic photoreceptor, comprises: a conductive support; a photosensitive layer provided on the conductive support; and a protective layer provided on the photosensitive layer, wherein the protective layer contains alumina particles which contain 2 to 50 ppm of phosphorus atoms and is subjected to a surface treatment with a compound A having a reactive functional group and a curable compound B, and the protective layer is a cured layer including a cured product material formed by at least the compound A on the surfaces of the alumina particles and the curable compound B.

Organic photoreceptor, image forming apparatus, and process cartridge

An electrophotographic photoreceptor is disclosed, comprising, on an electrically conductive substrate, a photosensitive layer and a surface layer provided sequentially in that order, in which the surface layer is a layer formed by polymerizing a polymerizable compound (I) containing seven to ten functional groups and exhibiting a reactive group equivalent of not more than 140 and not less than 100.

An organic photoreceptor having a photosensitive layer, an electric conductive support, and a protective layer is disclosed, in which the protective layer comprises a composition produced by reacting tin oxide particles an acryloyl or methacryloyl group on their surface with a compound having an acryloyl or methacryloyl group. A production method of the same, an image forming apparatus and a process cartridge using the same are also disclosed.

Organic photoreceptor, manufacturing method of organic photoreceptor, and image forming apparatus

In the present invention, disclosed is an organic photoreceptor comprising a conductive support and provided thereon, a photosensitive layer and a protective layer provided on the photosensitive layer, the protective layer formed with alumina particles each comprising a reactive organic group. Also provided is an organic photoreceptor with which electrophotographic images having high durability together with high image quality can be obtained by improving a wear property of the organic photoreceptor up to the same level as that of an amorphous silicon photoreceptor, as well as by improving image flow and image blur which are easy to be generated at high temperature and high humidity.

Organic photoreceptor, image forming apparatus and process cartridge

Disclosed is an electrophotogaphic photoreceptor that causes little or no abrasion-derived uneven image density and does not cause scratches and image defects attributable to the occurrence of scratches even after a large volume, for example, exceeding 1,000,000 sheets of printing, and that does not cause image blurring even after printing in an environment of a high-temperature and a high-relative humidity (RH) respectively exceeding 30&#xb0; C. and 80%. The electrophotographic photoreceptor comprises an electroconductive support and at least a photosensitive layer and a surface layer provided on the electroconductive support and is characterized in that the surface layer contains at least a compound obtained by reacting a polymerizable compound containing a methacryl group with particles containing a functional group reactive with the methacryl group and, in the polymerizable compound, the ratio between the number of methacryl groups and the molecular weight (number of methacryl groups/molecular weight) is not less than 0.0055.

Growing community of inventors

Tokyo, Japan

Seisuke Maeda