Canon Kabushiki Kaisha

Hideaki Nagasaka

Kunihiko Sekido

Michiyo Sekiya

Shinji Takagi

Takeshi Murakami

Yosuke Morikawa

Nobumichi Miki

Akihiro Maruyama

Masaki Nonaka

Tomohiro Kimura

Yoichi Kawamorita

Koichi Suzuki

Yuka Ishiduka

Kenichi Kaku

Wataru Kitamura

Shintetsu Go

Ryoichi Tokimitsu

Mai Murakami

Masato Tanaka

Hajime Miyazaki

Kazushige Nakamura

Yoshihiko Hyosu

Shigemori Tanaka

Kazuma Sato

Hiroyuki Ohmori

Noriyuki Takagi

Mayumi Nagasaka

Shinji Tagaki

An electrophotographic photosensitive member includes a support and a photosensitive layer formed on the support. A surface layer of the electrophotographic photosensitive member contains a polymerized product of a composition that contains a charge transporting compound having a particular group (polymerizable functional group).

Electrophotographic photosensitive member, method for producing electrophotographic photosensitive member, 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

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

An electrophotographic photosensitive member includes a support and a photosensitive layer formed on the support. A surface layer of the electrophotographic photosensitive member contains a polymerized product of a composition that contains a charge transporting compound having a particular group (chain polymerizable functional group).

In an electrophotographic photosensitive member having a surface layer containing a polymer obtainable by polymerization of a compound having a chain-polymerizable functional group, the compound having a chain-polymerizable functional group includes a compound represented by formula (1).

An electrophotographic photosensitive member has a surface layer that contains a polymer produced by the polymerization of a charge transporting substance having two or more methacryloyloxy groups per molecule. The surface layer contains a quinone derivative at a concentration of 5 ppm or more and 1500 ppm or less of the total mass of the polymer. The quinone derivative is a compound represented by the following formula (1) or a compound represented by the following formula (2) or both.

An undercoat layer of an electrophotographic photosensitive member contains a polymer having a specific repeating structural unit in order to provide an electrophotographic photosensitive member that suppresses positive ghost, and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

The present invention relates to an electrophotographic photosensitive member obtained by providing an intermediate layer and a photosensitive layer on a conductive support in the stated order, the electrophotographic photosensitive member being characterized in that the intermediate layer contains a specific polyolefin resin and a specific organic electron-transporting substance, and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member.

An electrophotographic photosensitive member includes a support and a photosensitive layer. The electrophotographic photosensitive member includes a surface layer that contains a polymer produced by the polymerization of a compound having a chain-polymerizable functional group. The compound having a chain-polymerizable functional group is a compound represented by the following formula (1).

The present invention is an electrophotographic photosensitive member including a conductive support, an intermediate layer which is placed on the conductive support, and a photosensitive layer which is placed on the intermediate layer, wherein the intermediate layer comprises a metal-oxide particle and a compound having a structure represented by the following formula (1): 

The electrophotographic photosensitive member includes a conductive support and an intermediate layer, a charge generation layer and a charge transport layer, which are provided on the conductive support in this order. The intermediate layer contains an ethylene-acrylic acid binary copolymer and a polyolefin resin in which repeating structural units are contained in a particular ratio.

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

The present invention relates to an electrophotographic photosensitive member obtained by providing, on a conductive support, a conductive layer containing conductive particles having a volume-average particle diameter of 0.1 &#x3bc;m or more, an intermediate layer, and a photosensitive layer in the stated order in which the conductive layer contains a polyolefin resin containing a specific repeating structural unit at a specific ratio, and a process cartridge and an electrophotographic apparatus each having the electrophotographic photosensitive member.

An electrophotographic photosensitive member comprises a conductive support, an intermediate layer provided on the conductive support, and a photosensitive layer provided on the intermediate layer, in which at least one of the intermediate layer and the photosensitive layer comprises a compound represented by the following formula (1): 

The electrophotographic photosensitive member contains a support; and a first intermediate layer, a second intermediate layer and a photosensitive layer which are provided on the support in this order, in which the second intermediate layer contains a polyolefin resin and a metal oxide particle having a volume-average particle diameter of 20 nm or less, and the first intermediate layer contains a metal oxide particle, and the volume-average particle diameter of the metal oxide particle contained in the first intermediate layer is 10 times or more to 200 times or less as large as the volume average particle diameter of the metal oxide particle contained in the second intermediate layer.

To provide an electrophotographic photosensitive member that can reproduce good images with less positive ghost and also has a good photosensitivity, the electrophotographic photosensitive member is incorporated in its photosensitive layer with a copolymer having a repeating structural unit represented by the formula (1) and a repeating structural unit represented by the formula (2), or a copolymer having a repeating structural unit represented by the formula (1) and a repeating structural unit represented by the formula (3).Z-A-Z-E&#x2003;&#x2003;(1)Z-A-Z&#x2014;W&#x2014;B&#x2014;W&#x2003;&#x2003;(2)Z&#x2014;B&#x2014;Z-E&#x2003;&#x2003;(3)

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Suntou-gun, Japan

Hideaki Nagasaka