Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

• US 8,865,380 B2
• Filed: 01/14/2011
• Issued: 10/21/2014
• Est. Priority Date: 01/15/2010
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Noguchi, Kazunori, Ogaki, Harunobu, Ochi, Atsushi, Takahashi, Koji, Murai, Shio
• Primary Examiner(s): Vajda, Peter
• Assistant Examiner(s): GODO, OLATUNJI A
• Application Number:
  US13/007,439
• Publication Number:
  US 20110177438A1
• Time in Patent Office: 1,376 Days
• Field of Search: 430/59.6, 430/58.2, 399/111, 399/159
• US Class Current: 430/58.2
• CPC Class Codes: G03G 15/75 Details relating to xerographic drum, band or plate, e.g. replacing, testing electrographic recording members per se G03G5/00
• CPC Class Codes: G03G 5/056 Polyesters
• CPC Class Codes: G03G 5/0564 Polycarbonates
• CPC Class Codes: G03G 5/0578 Polycondensates comprising silicon atoms in the main chain

Abstract

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.

Claims

1. An electrophotographic photosensitive member comprising a support, a charge generation layer provided on the support, and a charge transport layer provided on the charge generation layer, the charge transport layer being a surface layer of the electrophotographic photosensitive member, wherein

the charge transport layer contains:

a charge transporting material,

a polyester resin A having a repeating structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2), and,

at least one of a polyester resin C having a repeating structural unit represented by the following formula (C) and a polycarbonate resin D having a repeating structural unit represented by the following formula (D);

the polyester resin A contains a siloxane moiety in an amount of from 5% by mass or more to 30% by mass or less based on the total mass of the polyester resin A; and

the charge transport layer has a matrix-domain structure comprising a matrix made of the charge transporting material and at least one of the polyester resin C and the polycarbonate resin D, and a domain made of the polyester resin A and formed in the matrix;

2. The electrophotographic photosensitive member according to claim 1, wherein said charge transport layer contains the siloxane moiety in an amount of from 1% by mass or more to 20% by mass or less based on the total mass of all the binder resins in the charge transport layer.

3. The electrophotographic photosensitive member according to claim 1, wherein n in the formula (1) is from 40 or more to 150 or less.

4. A process cartridge comprising and integrally supporting the electrophotographic photosensitive member according to claim 1, and at least one device selected from the group consisting of a charging device, a developing device, a transfer device and a cleaning device, the process cartridge being detachably provided in a main body of an electrophotographic apparatus.

5. An electrophotographic apparatus comprising the electrophotographic photosensitive member according to claim 1, a charging device, an exposure device, a developing device and a transfer device.