Canon Kabushiki Kaisha

Lion Specialty Chemicals Co., Ltd.

Mai Murakami

Wataru Kitamura

Ryoichi Tokimitsu

Yuka Ishiduka

Takeshi Murakami

Kenichi Kaku

Kan Tanabe

Kazumichi Sugiyama

Masaki Nonaka

Hideaki Nagasaka

Daisuke Kawaguchi

Koji Takahashi

Yuki Yamamoto

Kenichi Ikari

Harunobu Ogaki

Atsushi Okuda

Atsushi Fujii

Kimihiro Yoshimura

Yohei Miyauchi

Tsuyoshi Shimada

Haruhiko Mitsuda

Yoshihisa Saito

Eiji Moriguchi

The disclosure provides an anti-adhesive composition for unvulcanized rubbers which enables a reduction in anti-adhesive-induced dusting, can exhibit high anti-adhesive properties even in a small application amount, and brings about high slipperiness. The anti-adhesive composition for unvulcanized rubbers includes (A) a water-soluble polymer, (B) particles of a water-insoluble organic polymer, (C) a metal soap, (D) a surfactant and water. The anti-adhesive composition for unvulcanized rubbers includes, with respect to the whole mass of the components excluding the water, 30 mass % or more the component (A), 1-20 mass % the component (B), 20-50 mass % the component (C), and 10-20 mass % the component (D).

Anti-adhesive composition for unvulcanized rubber

Provided is an electrophotographic photosensitive member, including: a support; a charge-generating layer on the support; a charge-transporting layer on the charge-generating layer; and a protective layer on the charge-transporting layer, wherein the protective layer contains the following components (&#x3b1;), (&#x3b2;), and (&#x3b3;): (&#x3b1;) a polymer of a hole-transportable compound; (&#x3b2;) a polycarbonate resin; and (&#x3b3;) a hole-transportable compound, wherein a content of the component (&#x3b2;) in the protective layer is 0.01 mass % or more and 4.0 mass % or less with respect to a content of the component (&#x3b1;) in the protective layer, wherein a content of the component (&#x3b3;) in the protective layer is 0.001 mass % or more and 3.0 mass % or less with respect to the content of the component (&#x3b1;) in the protective layer, and wherein the charge-transporting layer contains the component (&#x3b3;).

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

The present invention provides an electrophotographic apparatus in which the deterioration of electrical properties in repetitive use is suppressed even in the case where an electrophotographic photosensitive member absorbs moisture under a high-temperature and high-humidity environment. An undercoat layer of the electrophotographic photosensitive member provided in the electrophotographic apparatus contains (&#x3b1;) a metal oxide particle, (&#x3b2;) a particular benzophenone compound and (&#x3b3;) a compound represented by the following formula (2). wherein Rto Reach independently represent a hydrogen atom, a hydroxy group, a halogen atom, an alkyl group, an alkoxy group or an amino group and Arepresents an alkenyl group having 2 or more and 4 or less carbon atoms.

Electrophotographic apparatus

An undercoat layer of an electrophotographic photosensitive member contains a binder resin and conductive particles. Each of the conductive particles has a core particle coated with tin oxide doped with aluminum.

The present invention provides an electrophotographic photosensitive member in which an undercoat layer contains a metal oxide particle, a particular benzophenone compound and a particular ketone compound, a process cartridge and an electrophotographic apparatus each including the electrophotographic photosensitive member and a process for producing the electrophotographic photosensitive member.

Electrophotographic photosensitive member, process cartridge, electrophotographic apparatus and process for producing electrophotographic photosensitive member

An electrophotographic photosensitive member includes a support, an undercoat layer which contains a metal oxide particle and is formed on the support, a charge generating layer formed on the undercoat layer, and a charge transporting layer formed on the charge generating layer. Either or both of the undercoat layer and the charge generating layer contain a compound represented by formula (1).

Electrophotographic photosensitive member, method for producing electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

An electrophotographic photosensitive member includes a surface layer with a hexagonal boron nitride dispersed therein. The hexagonal boron nitride has a graphitization index (GI) of at least 3.0 and less than 15.0.

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

An electrophotographic photosensitive member includes an undercoat layer that includes metal oxide particles and a compound having at least three hydroxyl groups and a carbonyl or dicarbonyl group.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus incorporating an improved undercoat layer

The present invention provides an electrophotographic photosensitive member which includes an undercoat layer, and the undercoat layer contains metal oxide particles and a compound represented by the formula (1). 

Electrophotographic photosensitive member, method for manufacturing the same, process cartridge, and electrophotographic apparatus

An electrophotographic photosensitive member includes an undercoat layer containing a silane coupling agent having a divalent group represented by &#x2014;NH&#x2014; and an urethane resin. The modulus of elastic deformation (we/wt) of a surface of the undercoat layer satisfies formula (X), where the modulus of elastic deformation is measured by a universal hardness test.

Electrophotographic photosensitive member, method of producing the same, process cartridge, and electrophotographic apparatus

An electrophotographic photoconductor has a support medium, an undercoat layer formed immediately on the support medium, and a photosensitive layer formed immediately on the undercoat layer, in which the undercoat layer contains a binding resin and composite particles each containing a core material particle covered with tin oxide doped with a predetermined amount of aluminum.

Electrophotographic photoconductor, process cartridge, and electrophotographic apparatus

Provided are an electrophotographic photosensitive member in which a variation in the light-area potential is suppressed even when the electrophotographic photosensitive member is repeatedly used for a long time in a high-temperature, high-humidity environment, a method of producing the electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus that include the electrophotographic photosensitive member. The electrophotographic photosensitive member includes a support, an undercoat layer, and a photosensitive layer, wherein the undercoat layer contains a urethane resin and zinc oxide particles whose surfaces have been treated with a particular amount of an aminosilane compound.

Electrophotographic photosensitive member, method of producing electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

A composition that contains a compound represented by the formula (1) is dissolved in an organic compound, and the composition is purified by using a basic adsorbent that contains at least 15% by mass magnesium and has a volume average particle diameter of 10 &#x3bc;m to 500 &#x3bc;m, both inclusive. An undercoat-layer-forming coating liquid is prepared by removing the basic adsorbent and dispersing metal oxide particles in the obtained solution containing the purified form of the composition. An undercoat layer is formed by forming a coat of the undercoat-layer-forming coating liquid and drying the coat.

Method for producing electrophotographic photosensitive member

A method is provided for testing a charge generation layer disposed directly on an undercoat layer disposed directly on an aluminum-based cylindrical support member formed by extrusion and drawing having a periphery not subjected to cutting work. The method includes testing the charge generation layer for a defect or a suspected defect by irradiating the charge generation layer with light, and receiving reflected light from the charge generation layer with a light receiving device. The light emitted to the charge generation layer has a wavelength within the range of the absorption wavelengths of the charge generation layer, and whose transmittance to the undercoat layer is 0.3% or less.

Method for testing charge generation layer and process for manufacturing electrophotographic photoreceptors on large scale

In order to provide an electrophotographic photosensitive member in which the dark-area potential does not easily change even when repeatedly used for a long period of time under a normal temperature/low humidity environment, a method of producing the electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus, each comprising the electrophotographic photosensitive member, an undercoat layer of the electrophotographic photosensitive member is incorporated with an organic resin, a metal oxide particle, and a specific compound (phosphine oxide compound).

Growing community of inventors

Kashiwa, Japan

Mai Murakami