Member for electrophotography, developing apparatus, and electrophotographic apparatus

• US 10,082,741 B2
• Filed: 09/19/2016
• Issued: 09/25/2018
• Est. Priority Date: 10/06/2015
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ishida, Kazutoshi, Sakurai, Yuji
• Primary Examiner(s): Zacharia, Ramsey E
• Application Number:
  US15/269,135
• Publication Number:
  US 20170097580A1
• Time in Patent Office: 736 Days
• CPC Class Codes: G03G 15/0818 characterised by the structure of the donor member, e.g. surface properties
• CPC Class Codes: G03G 2215/0141 the linear arrangement being horizontal
• CPC Class Codes: G03G 5/04 Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor

Abstract

Provided is a member for electrophotography that enables stable formation of a high-quality electrophotographic image even when used as a developing member over a long period of time. The member for electrophotography includes: a support; an electro-conductive elastic layer on the support; and a plurality of electrically insulating domains on the electro-conductive elastic layer, in which a surface of the member for electrophotography includes surfaces of the electrically insulating domains and an exposed portion of the electro-conductive elastic layer free of being covered by the electrically insulating domains, and in which the electrically insulating domains each contain a resin having a specific structure.

Claims

1. A member for electrophotography, comprising:

a support;

an electro-conductive elastic layer on the support; and

a plurality of electrically insulating domains on the electro-conductive elastic layer, wherein

a surface of the member for electrophotography includes surfaces of the electrically insulating domains with an exposed portion of the electro-conductive elastic layer free of being covered by the electrically insulating domains, and

the electrically insulating domains contain a resin having a structure represented by formula (1);

A_nR 

 

(1)

where n represents an integer of 2 or more, R represents a linking group that links n pieces of A and the linking group R contains an oligomer component of at least one resin selected from the group consisting of polyurethane, polyester, an epoxy resin, and polybutadiene, and A represents a structure represented by formula (2);

2. A member for electrophotography according to claim 1, wherein (M2/M1)*100≤

15

where M2 represents a mass of a residue obtained by subjecting the electrically insulating domains having a mass M1 to reflux in a Soxhlet extractor for 36 hours using methyl ethyl ketone as a solvent, and removing the methyl ethyl ketone from the resultant extract solution.

3. A member for electrophotography according to claim 1, wherein the electrically insulating domains are each formed in a convex shape with respect to a surface of the electro-conductive elastic layer.

4. A member for electrophotography comprising:

a support;

an electro-conductive elastic layer on the support; and

a plurality of electrically insulating domains on the electro-conductive elastic layer, wherein

a surface of the member for electrophotography includes surfaces of the electrically insulating domains with an exposed portion of the electro-conductive elastic layer free of being covered by the electrically insulating domains, and

the electrically insulating domains contain a resin having a structure represented by formula (1);

A_nR 

 

(1)

where n represents an integer of 2 or more, R represents a linking group that links n pieces of A, and A represents a structure represented by formula (2);

5. A developing apparatus, comprising a developing member, the developing member comprising:

a support;

an electro-conductive elastic layer on the support; and

a plurality of electrically insulating domains on the electro-conductive elastic layer, wherein

a surface of the member for electrophotography includes surfaces of the electrically insulating domains with an exposed portion of the electro-conductive elastic layer free of being covered by the electrically insulating domains, and

the electrically insulating domains contain a resin having a structure represented by formula (1);

A_nR 

 

(1)

where n represents an integer of 2 or more, R represents a linking group that links n pieces of A and the linking group R contains an oligomer component of at least one resin selected from the group consisting of polyurethane, polyester, an epoxy resin, and polybutadiene, and A represents a structure represented by formula (2);

6. A developing apparatus comprising a developing member, the developing member comprising:

a support;

an electro-conductive elastic layer on the support; and

a plurality of electrically insulating domains on the electro-conductive elastic layer, wherein

a surface of the member for electrophotography includes surfaces of the electrically insulating domains with an exposed portion of the electro-conductive elastic layer free of being covered by the electrically insulating domains, and

the electrically insulating domains contain a resin having a structure represented by formula (1);

A_nR 

 

(1)

where n represents an integer of 2 or more, and R represents a linking group that links n pieces of A, and A represents a structure represented by formula (2);