Electrophotographic member, process cartridge and electrophotographic apparatus

• US 8,846,287 B2
• Filed: 12/09/2013
• Issued: 09/30/2014
• Est. Priority Date: 06/27/2012
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamada, Masaki, Ishida, Kazutoshi, Ito, Minoru, Wakabayashi, Kazuhito, Uesugi, Tomoya
• Primary Examiner(s): LE, HOA VAN
• Application Number:
  US14/101,299
• Publication Number:
  US 20140093278A1
• Time in Patent Office: 295 Days
• Field of Search: 430/123.3, 399/286
• US Class Current: 430/123.3
• CPC Class Codes: G03G 15/06 for developing
• CPC Class Codes: G03G 15/0818 characterised by the structure of the donor member, e.g. surface properties
• 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: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31598 Next to silicon-containing [silicone, cement, etc.] layer

Abstract

A high quality electrophotographic member that is excellent in deformation recovery property under high-temperature and high-humidity and that also satisfies filming resistance under low-temperature and low-humidity is provided.

The electrophotographic member includes a substrate, an elastic layer, and a surface layer containing a urethane resin, wherein the urethane resin has a partial structure having at least one structure selected from the group consisting of structures of structural formulae (1) to (7) between adjacent two urethane linkages, and the urethane resin further has a partial structure derived from a reaction of a compound represented by a structural formula (8) with a polyisocyanate.

Claims

1. An electrophotographic member comprising a substrate, an elastic layer, and a surface layer containing a urethane resin,

wherein the urethane resin

has a partial structure A having at least one structure selected from the group consisting of structures of the following structural formulae (1) to (7) between adjacent two urethane linkages, and

further has a partial structure B derived from a reaction of a compound represented by the following structural formula (8) with a polyisocyanate:

2. The electrophotographic member according to claim 1, wherein

the urethane resin has, between adjacent two urethane linkages, a partial structure having

the structure represented by the structural formula (1), and

at least one structure selected from the group consisting of the structure represented by the structural formula (2) and the structure represented by the structural formula (3).

3. The electrophotographic member according to claim 1, wherein the compound represented by the structural formula (8) is a compound represented by the following structural formula (10):

4. The electrophotographic member according to claim 1, wherein the polyisocyanate is a polyisocyanate which has a number average molecular weight of 1000 or more and 4000 or less and whose chain is extended by a polyol having an average functionality of 2 or more and 3 or less.

5. The electrophotographic member according to claim 1, wherein the elastic layer contains a cured product of a silicone rubber.

6. A process cartridge on which a developer carrying member is mounted, the process cartridge being configured to be detachable to a main body of an electrophotographic apparatus, wherein the developer carrying member is an electrophotographic member according to claim 1.

7. An electrophotographic apparatus provided with an electrophotographic photosensitive member, and a developer carrying member arranged opposite to the electrophotographic photosensitive member, for supplying a toner to the electrophotographic photosensitive member,

wherein the developer carrying member is an electrophotographic member according to claim 1.