Developing member including elastic member containing cured product of addition-curing silicone rubber mixture, processing cartridge including the developing member, and electrophotographic apparatus including the developing member

• US 8,768,227 B2
• Filed: 02/19/2013
• Issued: 07/01/2014
• Est. Priority Date: 09/07/2012
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Urushihara, Shohei, Nakamura, Minoru, Kawamura, Kunimasa, Yamada, Masaki, Kusaba, Takashi
• Primary Examiner(s): Royer, William J
• Application Number:
  US13/770,796
• Publication Number:
  US 20140072350A1
• Time in Patent Office: 497 Days
• Field of Search: 399/279, 399/286
• US Class Current: 399/286
• CPC Class Codes: G03G 15/0808 characterised by the developer supplying means, e.g. structure of developer supply roller
• CPC Class Codes: G03G 15/0818 characterised by the structure of the donor member, e.g. surface properties
• CPC Class Codes: G03G 21/1814 Details of parts of process cartridge, e.g. for charging, transfer, cleaning, developing G03G21/1835 takes precedence

Abstract

A developing roller includes: a mandrel; an elastic layer provided for an outer periphery of the mandrel, the elastic layer including an addition-curing silicone rubber; and a surface layer provided for an outer periphery of the elastic layer, in which: the elastic layer includes a compound represented by the following formula (1); when the content of such a compound that n in the formula (1) represents an integer of 3 to 12 in the elastic layer is represented by P1, and the content of such a compound that n in the formula (1) represents an integer of 13 to 20 in the elastic layer is represented by P2, P1+P2 is 5,000 ppm by mass to 12,000 ppm by mass; and P1 is 1,500 ppm by mass to 6,000 ppm by mass (In the formula (1), n represents an integer of 3 to 20):

Claims

1. A developing member, comprising:

a substrate;

an elastic layer provided on the substrate, the elastic layer comprising a cured product of an addition-curing silicone rubber mixture; and

a surface layer provided on the elastic layer,

wherein;

the elastic layer comprises a compound represented by the following formula (1);

2. The developing member according to claim 1, wherein the P1+P2 is 6,000 ppm by mass or more and 11,000 ppm by mass or less.

3. The developing member according to claim 2, wherein the P1+P2 is 7,000 ppm by mass or more and 10,000 ppm by mass or less.

4. The developing member according to claim 1, wherein the P1 is 2,000 ppm by mass or more and 5,500 ppm by mass or less.

5. The developing member according to claim 4, wherein the P1 is 2,500 ppm by mass or more and 5,000 ppm by mass or less.

6. The developing member according to claim 1, wherein the addition-curing silicone rubber mixture comprises the following component (A), component (B), and component (C):

(A) an organopolysiloxane having, in a molecule thereof, at least two alkenyl groups bonded to a silicon atom;

(B) an organopolysiloxane having, in a molecule thereof, at least three hydrogen atoms bonded to a silicon atom; and

(C) a platinum-based catalyst.

7. The developing member according to claim 6, wherein the component (A) has a weight-average molecular weight of 20,000 or more and 200,000 or less.

8. The developing member according to claim 1, wherein the elastic layer comprises an inorganic filler at a ratio of 0.1 mass % or more and 24 mass % or less.

9. A process cartridge, comprising:

a toner;

a toner container storing the toner; and

a developing member for carrying the toner in the toner container on a surface thereof and conveying the toner to a developing region,

the process cartridge being constituted to be attachable to and detachable from a main body of an electrophotographic apparatus,

wherein the developing member comprises the developing member according to claim 1.

10. An electrophotographic apparatus, comprising:

a toner;

a toner container storing the toner; and

a developing member for carrying the toner in the toner container on a surface thereof and conveying the toner to a developing region,

wherein the developing member comprises the developing member according to claim 1.