Canon Kabushiki Kaisha

Kazuko Araki

Kaname Watariguchi

Masataka Kawahara

Akihiro Maruyama

Jumpei Kuno

Yuki Yamamoto

Michiyo Sekiya

Atsushi Okuda

Tsutomu Nishida

Nobuhiro Nakamura

Yuka Ishiduka

Atsushi Fujii

Kazunori Noguchi

Kenichi Kaku

Daisuke Miura

Tatsuya Ikezue

Tomohito Ishida

Daisuke Kawaguchi

Tatsuya Yamaai

Isao Kawata

Yuto Ito

Shoma Hinata

Takahisa Taniguchi

Hiroto Hirayama

Shinobu Iijima

Takahiro Nagase

Shintarou Goto

Taneyuki Kinoshita

A method for manufacturing an electrophotographic photoconductor including a charge generating layer and a charge transport layer in this order on a cylindrical electrically-conductive support including the steps of: (i) immersing the support in a charge generating layer coating liquid, (ii) pulling the support out of the coating liquid, (iii) heat drying the support coated with the coating liquid to form the charge generating layer, (iv) cooling the charge generating layer, and (v) immersing the support on which the charge generating layer has been formed in a charge transport layer coating liquid while retaining gas inside of the support. The charge transport layer coating liquid contains a solvent having a boiling point of 34&#xb0; C. or more and 85&#xb0; C. or less, and the step (v) satisfies two specific conditions.

Method for manufacturing electrophotographic photoconductor

An electrophotographic photosensitive member includes, in this order, a support, a charge generating layer having a thickness of more than 200 nm and containing a hydroxygallium phthalocyanine pigment or a chlorogallium phthalocyanine pigment as a charge generating material, and a charge transport layer containing a charge transporting material. The charge generating material satisfies a requirement for a specific parameter.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

An electrophotographic photosensitive member includes an electroconductive support member and a photosensitive layer. The uppermost layer of the electrophotographic photosensitive member defines a surface layer, and the surface layer contains polytetrafluoroethylene particles, a charge transporting material, and polyvinyl acetal. The proportion of the polyvinyl acetal content to the polytetrafluoroethylene particles content in the surface layer is in the range of 0.1% by mass to 15.0% by mass, and the charge transporting material content in the surface layer is 35% by mass or more relative to the total mass of the surface layer.

An electrophotographic photosensitive member includes a support member, a charge generating layer containing a phthalocyanine pigment as a charge generating material, a charge transport layer containing a charge transporting material in this order. The charge generating layer has a thickness of less than 200 nm, and the phthalocyanine pigment includes phthalocyanine crystalline particles having a particle size distribution and satisfies a requirement that the volume average of the products of &#x3a6;i and &#x3a8;i is 0.31 or more.

An electrophotographic photoreceptor abuts against a charging member and/or a developer carrying member with an abutting member therebetween, has a first portion and a second portion abutting against the abutting member along the longitudinal direction of the photoreceptor, and includes a support, a charge generating layer containing a charge generation material, and a surface layer in this order. The first portion includes an undercoat layer containing a polymer of a composition containing an electron transport material and a crosslinking agent and being contiguous with the surface of the charge generating layer facing the support. The second portion includes (i) an intermediate layer being disposed between and being contiguous with the support and the charge generating layer and/or (ii) an intermediate layer being disposed between and being contiguous with the charge generating layer and the surface layer, wherein the intermediate layers each have a Martens hardness of 500 N/mmor less.

Electrophotographic photoreceptor, process cartridge, and electrophotographic apparatus

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Tokyo, Japan

Kazuko Araki