Canon Kabushiki Kaisha

Shio Murai

Harunobu Ogaki

Kazunori Noguchi

Atsushi Okuda

Takashi Anezaki

Koji Takahashi

Atsushi Ochi

Kazuhisa Shida

Hiroki Uematsu

Yasuhiro Kawai

A charge-transporting layer, which is a surface layer of an electrophotographic photosensitive member, has a matrix-domain structure having a matrix containing constituent &#x3b2; (a polycarbonate resin having a predetermined repeating structural unit) and a charge-transporting substance, and a domain containing constituent &#x3b1; (a polycarbonate resin having a repeating structural unit having a predetermined siloxane moiety).

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

A charge-transporting layer, which is a surface layer of an electrophotographic photosensitive member, has a matrix-domain structure having a matrix containing constituent &#x3b2; (a polyester resin having a predetermined repeating structural unit) and a charge-transporting substance, and a domain containing constituent &#x3b1; (a polycarbonate resin having a repeating structural unit having a predetermined siloxane moiety).

An electrophotographic photosensitive member comprises a charge-transporting layer which is a surface layer of the electrophotographic photosensitive member; wherein the charge-transporting layer has a matrix-domain structure having: a matrix comprising a component &#x3b2; and a component &#x3b3;, and a domain comprising a component &#x3b1;.

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

Provided is an electrophotographic photosensitive member which is excellent in terms of both continuous reduction of contact stress with contact members and the like and potential stability during repeated use. A charge transport layer which serves as a surface layer of an electrophotographic photosensitive member has a matrix-domain structure including a matrix containing a component [&#x3b2;] (polycarbonate resin D having a specific repeating structural unit) and a charge-transporting substance and domains containing a component [&#x3b1;] (polycarbonate resin A having a repeating structural unit including a specific siloxane moiety).

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

Provided is an electrophotographic photosensitive member, including: a support; and a photosensitive layer, which is provided on the support, in which: a surface layer of the electrophotographic photosensitive member includes a terminal siloxane-containing polyester resin having a specific structure; and a lower layer provided in contact with the surface layer includes a polycarbonate resin, a polyester resin, or a polyvinyl acetal resin, having a specific structure.

Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

A charge transport layer, which is the surface layer of an electrophotographic photosensitive member, contains a charge transporting material, and a polyester resin A having a repeating structural unit including a specific siloxane moiety and at least one of a polyester resin C having a specific structure and a polycarbonate resin D having a specific structure as a binder resin. The content of the siloxane moiety in the polyester resin A is from 5% by mass or more to 30% by mass or less based on the total mass of the polyester resin A. The charge transport layer includes a domain made of the polyester resin A in a matrix made of the charge transporting material and at least one of the polyester resin C and the polycarbonate resin D.

An electrophotographic photosensitive member having excellent cleaning performance, a process cartridge, and an electrophotographic apparatus. The peripheral surface of the member has flat portions having a width e (&#x3bc;m) satisfying 0.1&#x2266;e&#x2266;25 and a plurality of groove portions having a width w (&#x3bc;m) satisfying 0.1&#x2266;w&#x2266;25 and a depth d (&#x3bc;m) satisfying 0.1&#x2266;d&#x2266;3.0, the flat and groove portions at an angle &#x3b8; (&#xb0;) satisfying 80&#x2266;&#x3b8;&#x2266;100 with respect to the axial direction of the member. The sum e(&#x3bc;m) of the widths e of the flat portions per each width of&#x3bc;m in the axial direction of the peripheral surface satisfying 5&#x2266;e&#x2266;75, and e/esatisfying e/e&#x2266;0.46, where e(&#x3bc;m) is the average value of the widths e of the flat portions, and eis the standard deviation thereof.

An electrophotographic photosensitive member comprises a charge-transporting layer which is a surface layer of the electrophotographic photosensitive member; wherein the charge-transporting layer has a matrix-domain structure having: a matrix comprising a component [&#x3b2;] and a component [&#x3b3;] (charge-transporting substances having specific structures), and a domain comprising a component [&#x3b1;](resin [&#x3b1;1], or resin [&#x3b1;1] and resin [&#x3b1;2]).

An electrophotographic photosensitive member comprises a charge-transporting layer which is a surface layer of the electrophotographic photosensitive member; wherein the charge-transporting layer has a matrix-domain structure having: a matrix comprising: at least one resin selected from the group consisting of a polycarbonate resin C and a polyester resin D; and at least one charge-transporting substance selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (1'), and a domain comprising a polycarbonate resin A. 

The present invention is an electrophotographic photosensitive member including a charge-transporting layer as the surface layer of the electrophotographic photosensitive member having a matrix-domain structure including: a matrix including a component &#x3b2; (at least one resin of a polycarbonate resin C having a specific repeating structural unit and a polyester resin D having a specific repeating structural unit), and &#x3b3; (charge-transporting substance having a specific structure); and a domain including a component &#x3b1; (polycarbonate resin A having a repeating structural unit containing a specific siloxane moiety).

An electrophotographic apparatus is provided including an electrophotographic photosensitive member which includes a surface protective layer; and an exposure device which irradiates a surface of the electrophotographic photosensitive member with an exposure beam so as to form an electrostatic latent image on the surface of the electrophotographic photosensitive member, wherein the surface protective layer includes a material having no structure to provide charge transporting performance and has a plurality of through holes penetrating from the side of the front surface of the surface protective layer to the side of the charge transport layer, and the thickness of the surface protective layer is from 0.1 &#x3bc;m or more to 1.5 &#x3bc;m or less, and wherein when the surface of the electrophotographic photosensitive member is irradiated with the exposure beam, two or more of the through holes are included in an exposure beam spot.

Growing community of inventors

Toride, Japan

Shio Murai