Canon Kabushiki Kaisha

Yota Ito

Masato Tanaka

Nobuhiro Nakamura

Yuka Ishiduka

Hiroyuki Tomono

Daisuke Miura

Takeshi Murakami

Akihito Saitoh

Hiroyuki Watanabe

Takashi Anezaki

Kazumichi Sugiyama

Kenichi Kaku

Harunobu Ogaki

Daisuke Tanaka

Michiyo Sekiya

Kunihiko Sekido

Atsushi Okuda

Tatsuya Yamaai

Shuhei Iwasaki

Akira Sakakibara

Jumpei Kuno

Shoma Hinata

Kohei Makisumi

Hirofumi Kumoi

Tomohito Ishida

Masataka Kawahara

Tsutomu Nishida

Kazunori Noguchi

Akihiro Maruyama

Atsushi Fujii

Hirotoshi Uesugi

Daisuke Kawaguchi

Kei Tagami

Terunobu Saitoh

Nobuo Kosaka

The compound having a high refractive index characteristic and a high transmittance is a (meth)acrylate compound represented by the following general formula (1): in the general formula (1), X represents a phenylene group, Zto Zare selected from the group consisting of a phenyl group, a heteroaryl group, a phenylene group, a heteroarylene group, a phenylalkylene group having an alkylene group having 1 or more to 4 or less carbon atoms, and a heteroaralkylene group having an alkylene group having 1 or more to 4 or less carbon atoms, Pto Pare selected from the group consisting of an acryloyloxy group and a methacryloyloxy group, A is selected from the group consisting of an aryl group, a heteroaryl group, an arylene group, and a heteroarylene group, and 'm' and “n” each represent 0 or 1, provided that when the “m” represents 0, the “n” represents 0.

(Meth)acrylate compound

There is provided an electrophotographic photosensitive member having drum shape, the electrophotographic photosensitive member including a support and a photosensitive layer, wherein an outer surface of the electrophotographic photosensitive member has wrinkles, and when an observation region having square form with one side of 100 μm is placed at an arbitrary position on the outer surface, a line that passes through a central point of the observation region and is parallel to a circumferential direction of the electrophotographic photosensitive member is defined as a first reference line L1, and 3,599 reference lines obtained by rotating the first reference line L1 at every 0.1° around the central point are defined as L2 to L3,600, respectively, each of L1 to L3,600 intersects with convex portions of the wrinkles at a plurality of locations and has at least two different intersection angles selected from the plurality of locations.

Electrophotographic photosensitive member

A method for producing an electrophotographic photosensitive member including: forming a photosensitive layer; and forming a protective layer, wherein the step of forming the photosensitive layer forms a photosensitive layer having an amount of residual solvent of a first solvent in the photosensitive layer of 0.05% to 2.50% and an amount of residual solvent of a second solvent in the photosensitive layer of 0.50% to 2.50%, and the step of forming the protective layer includes step (A) of forming a cured film and step (B) of forming the protective layer having wrinkle shapes, wherein, in step (A), the irradiated coating film is heated at a heating temperature lower than a boiling point of the first solvent and in step (B), the cured film is heated at a heating temperature higher than a boiling point of the first solvent.

Method for producing electrophotographic photosensitive member

Provided is an electrophotographic photosensitive drum that achieves both of a reduction in torque of the electrophotographic photosensitive drum at the time of its cleaning and an improvement in image transferability. The electrophotographic photosensitive drum includes: a support; and a photosensitive layer arranged on the support, the electrophotographic photosensitive drum having arranged on an outer surface thereof at least two structure groups having different appearance periods, wherein when, out of the two structure groups, a group including structures having a smaller appearance period is defined as a first structure group, and a group including structures having a larger appearance period is defined as a second structure group, a height of the first structure group is lower than a height of the second structure group.

Electrophotographic photosensitive member having outer surface with first and second structure groups, the first structure group having a smaller appearance period and a lower height than the second structure group

An electrophotographic photosensitive member including: a support, an undercoat layer formed above the support, a charge generation layer formed on the undercoat layer, and a charge transport layer formed above the charge generation layer, wherein the undercoat layer contains a polyamide resin and a titanium oxide particle which is surface-treated with a compound represented by Formula (1): when a volume of the titanium oxide particles to a volume of the polyamide resin in the undercoat layer is a, and an average primary particle diameter of the titanium oxide particles is b [&#x3bc;m], the following Equation (A) is satisfied: Equation (A): 14.0&#x2264;a/b&#x2264;19.1; and the charge generation layer contains a charge generating material and a thermoplastic resin having a hydroxyl group and a hydroxyl number of 50 mgKOH/g or more.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

The present disclosure provides an electrophotographic photosensitive member that can simultaneously achieve the suppression of the occurrence of the black spot in a charged portion and the suppression of the deterioration in sensitivity of an exposed portion, even after stored in a high-temperature and high-humidity environment. An electrophotographic photosensitive member includes an electro-conductive support, an undercoat layer, a charge generation layer and a charge transport layer in this order, wherein an atomic concentration ratio R of the oxygen atom to the aluminum atom on the surface of the electro-conductive support, as measured by energy dispersive X-ray spectroscopy, satisfies the following Expression (1):1.6&#x2264;&#x2003;&#x2003;(1)

Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

An electrophotographic photoreceptor includes a support, an undercoat layer placed on the support, a charge generation layer placed on the undercoat layer, and a charge transport layer placed on the charge generation layer. The undercoat layer contains titanium oxide particles surface-treated with an organosilicon compound that is at least one member selected from the group consisting of compounds represented by formulas (1) to (8) and a polyamide resin. The charge generation layer contains hydroxygallium phthalocyanine.

Electrophotographic photoreceptor, process cartridge, and electrophotographic apparatus

The present disclosure provides an electrophotographic photosensitive member that reduces the accumulation of charge and the leakage which are caused by a repeated use in a long period of time. The electrophotographic photosensitive member has a support, an undercoat layer, a charge generation layer and a charge transport layer in this order, wherein the undercoat layer contains a polyamide resin, and a titanium oxide particle, wherein the titanium oxide particle has been surfacetreated with an organosilicon compound, wherein the undercoat layer satisfies 10&#x2264;&#x3b1;&#x2264;70, where &#x3b1; represents a degree [%] of hydrophobicity of the titanium oxide particle which has been surfacetreated with the organosilicon compound; and the undercoat layer satisfies 0.015&#x2264;(&#x3b2;&#xd7;&#x3b3;)&#x2264;0.040, where &#x3b2; represents an average primary particle size [&#x3bc;m] of the titanium oxide particles, and &#x3b3; represents a weight percentage [wt %] of an Si element of the organosilicon compound with respect to the titanium oxide particle.

Provided is an electrophotographic photosensitive member that is improved in potential stability in long-term use under a high-temperature and high-humidity environment, and does not cause degradation in image quality, such as a low density. The electrophotographic photosensitive member includes: a support; an undercoat layer formed on the support; a charge-generating layer formed directly on the undercoat layer; and a charge-transporting layer formed on the charge-generating layer. The undercoat layer contains a polyamide resin, titanium oxide particles surface-treated with an organic silicon compound, and a compound represented by the following Formula (1), and has a content of the compound represented by the Formula (1) of 4 ppm or more and 80 ppm or less: in the Formula (1), R and R' each independently represent a methyl group or an ethyl group.

Electrophotographic photosensitive member, electrophotographic apparatus, and process cartridge

An electrophotographic photosensitive member with suppressed potential variation even in the case that a protective layer including a cured material of a composition having a polymerizable functional group is used is provided. An electrophotographic photosensitive member including a support, a charge generation layer, a charge transport layer containing a charge transporting material, and a protective layer, in the order presented, wherein the charge transport layer contains a polycarbonate resin having a structure selected from a group A and a structure selected from a group B, and the protective layer includes a cured material of a composition containing a compound having at least a functional group selected from chain-polymerizable functional groups and sequential polymerizable functional groups.

An electrophotographic photosensitive member includes a support, a charge generating layer containing a charge generation material, and a charge transporting layer containing a charge transport material in this order, the charge transporting layer serving as a surface layer. The charge transporting layer contains a polycarbonate resin having a particular structural unit.

An electrophotographic photosensitive member has a support, a charge generation layer, and a charge transport layer in this order, the charge transport layer containing a charge transport material. The charge transport layer is a surface layer of the electrophotographic photosensitive member and contains a polycarbonate resin having a structural unit selected from group A and a structural unit selected from group B.  

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

A process cartridge includes an electrophotographic photosensitive member and a gap retaining member, where the electrophotographic photosensitive member includes a first region having an undercoat layer, a charge generating layer, and a charge transporting layer on a support in this order and a second region having an undercoat layer and a charge transporting layer on a support in this order, the undercoat layer contains a metal oxide particle and any one of an urethane resin, an amino resin, and a polyamide resin as a binder resin, and the charge transporting layer contains a charge transporting substance and at least one selected from the group consisting of a polycarbonate resin and a polyester resin, and where the gap retaining member comes into contact with a surface of the second region of the electrophotographic photosensitive member.

Provided is an electrophotographic apparatus, including an electrophotographic photosensitive member, a charging unit arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, a cleaning unit or a developing unit arranged in abutment against the electrophotographic photosensitive member, and a transferring unit.

Electrophotographic apparatus and process cartridge

An electrophotographic photosensitive member includes a hole transporting layer containing a polyester resin having a structural unit expressed by formula (1) as a hole transporting substance.

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Mishima, Japan

Yota Ito