Developer carrying member, process cartridge, and electrophotographic apparatus

Patent metadata

Field	Value
Publication number	US-11029622-B2
Application number	US-202016809353-A
Country	US
Kind code	B2
Filing date	Mar 4, 2020
Priority date	Sep 11, 2017
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

Provided is a developer carrying member that enables stable formation of images of high quality even on recording paper having a high talc content. The developer carrying member includes a conductive base member and a surface layer, wherein the surface layer includes a urethane resin, and the urethane resin has a carbonate bond and a tertiary amine structure.

First claim

The invention claimed is:

1. A developer carrying member comprising a base member and a surface layer,
wherein the surface layer includes a urethane resin, and
the urethane resin has a carbonate bond and includes a tertiary amine structure.

2. The developer carrying member according to claim 1 , wherein the urethane resin has a moiety represented by Structural formula (1):

[in Structural formula (1), R1 represents a linear or branched alkylene group having 2 or more and 4 or less carbon atoms, n is an integer of 0 or more and 4 or less; when n is 2 or more and 4 or less, a plurality of R1 are each independently defined as above,
when n is 0, symbols “*1”, “*2”, and “*3” each independently represent a bonding point for a linear or branched alkyl group having 1 to 4 carbon atoms, or a bonding point for a polymer chain of the urethane resin,
when n is 1 or more and 4 or less, symbols “*1”, “*2”, “*3”, and “*4” each independently represent a bonding point for a hydrogen atom, a bonding point for a linear or branched alkyl group having 1 to 4 carbon atoms, or a bonding point for the polymer chain of the urethane resin; when n is 2 or more and 4 or less, a plurality of “*4” are each independently defined as above,
provided that, when n is 1, “*1”, “*2”, “*3”, and “*4” are all bonding points for the polymer chain of the urethane resin, and
when n is 2 or more and 4 or less, at least four selected from “*1”, “*2”, “*3”, and a plurality of “*4” are bonding points for the polymer chain of the urethane resin].

3. The developer carrying member according to claim 1 , further comprising an elastic layer between the base member and the surface layer.

4. The developer carrying member according to claim 1 , wherein, in the urethane resin, a concentration of the carbonate bond is 14.0 mass % or more and 23.0 mass % or less, and, in the urethane resin, a concentration of a nitrogen atom of tertiary amine is 1.0 mass % or more and 3.0 mass % or less.

5. The developer carrying member according to claim 1 , wherein the urethane resin includes a structure represented by Structural formula (4) below and including a carbonate bond:

[in Structural formula (4), R31 is a linear or branched alkylene group having 3 or more and 8 or less carbon atoms or an alkylene group having 4 or more and 8 or less carbon atoms and including a cyclic hydrocarbon structure having 4 or more and 6 or less carbon atoms].

6. The developer carrying member according to claim 1 , wherein the urethane resin has, between two adjacent urethane bonds, a structure represented by Structural formula (5):

[in Structural formula (5), R41 represents a linear or branched alkylene group having 3 or more and 8 or less carbon atoms, or an alkylene group having 4 or more and 8 or less carbon atoms and including a cyclic hydrocarbon structure having 4 or more and 6 or less carbon atoms, R42 represents a linear or branched alkylene group having 3 or more and 8 or less carbon atoms,
p is an integer of 1 or more, k is an integer of 1 or more; when p and k are 2 or more, a plurality of R41 and a plurality of R42 are each independently defined as above].

7. The developer carrying member according to claim 6 , wherein p and k in Structural formula (5) above satisfy a relation represented by Formula (I) below:
1.4≤ p/k≤ 1.8   Formula (I).

8. A developer carrying member comprising a base member, an elastic layer on the base member, and a surface layer on the elastic layer, wherein the surface layer includes a urethane resin,
the urethane resin has a carbonate bond in a molecule thereof, and has a moiety derived from a reaction between a compound represented by Structural formula (2) below and polyisocyanate:

[In Structural formula (2), R15 represents a linear or branched alkylene group having 2 or more and 4 or less carbon atoms, n is an integer of 0 or more and 4 or less; when n is 2 or more and 4 or less, a plurality of R15 are each independently defined as above,
when n is 0, R11 to R13 are each independently selected from (a2), (b), (c), and (d) below,
R11 to R14 in a case where n is 1 and R11 to R13 and a plurality of R14 in a case where n is 2 or more and 4 or less are each independently selected from (a1), (a2), (b), (c), and (d) below,
provided that, when n is 1, R11 to R14 are each selected from (b) to (d) below,
when n is 2 or more and 4 or less, at least four of R11 to R13 and two to four R14 are selected from (b) to (d) below:
(a1) a hydrogen atom
(a2) a linear or branched alkyl group having 1 to 4 carbon atoms;
(b) a linear or branched hydroxyalkyl group having 1 or more and 8 or less carbon atoms;
(c) a linear or branched aminoalkyl group having 2 or more and 8 or less carbon atoms; and
(d) a group represented by Structural formula (3) below:

[in Structural formula (3), m is 2 or 3, and a plurality of R21 each independently represent a linear or branched alkylene group having 2 or more and 5 or less carbon atoms]].

9. The developer carrying member according to claim 8 , wherein the compound represented by Structural formula (2) above is a compound represented by Structural formula (6) below:

[in Structural formula (6), R55 represents a linear or branched alkylene group having 2 or more and 4 or less carbon atoms, q is an integer of 0 or more and 4 or less; when q is 2 or more and 4 or less, a plurality of R55 are each independently defined as above; R51 to R54 each independently represent a linear or branched alkylene group having 2 or more and 5 or less carbon atoms; when q is 2 or more and 4 or less, a plurality of R54 are each independently defined as above].

10. A process cartridge configured to be detachably attached to a main body of an electrophotographic apparatus, the process cartridge at least comprising:
a toner container including toner, and a developer carrying member conveying the toner, wherein the developer carrying member comprises a base member and a surface layer,
wherein the surface layer includes a urethane resin, and
the urethane resin has a carbonate bond and includes a tertiary amine structure.

11. An electrophotographic apparatus at least comprising:
an electrophotographic photoconductor;
a charging member disposed so as to be configured to charge the electrophotographic photoconductor; and
a developer carrying member supplying toner to the electrophotographic photoconductor,
wherein the developer carrying member comprises a base member and a surface layer,
wherein the surface layer includes a urethane resin, and
the urethane resin has a carbonate bond and includes a tertiary amine structure.

12. The electrophotographic apparatus according to claim 11 , wherein the developer carrying member is disposed in contact with the electrophotographic photoconductor.

13. The electrophotographic apparatus according to claim 12 , wherein the developer carrying member further comprises an elastic la

Assignees

• Canon Kk

Inventors

• Yamaguchi Sosuke
• Ito Minoru
• Koyanagi Takashi
• Miyazawa Takahiro
• Urushihara Shohei
• Nakamura Kentarou

Classifications

• G03G21/1814

  Details of parts of process cartridge, e.g. for charging, transfer, cleaning, developing (G03G21/1835 takes precedence) · CPC title

• C08G18/7671

  containing only one alkylene bisphenyl group · CPC title

• C08G18/7664

  containing alkylene polyphenyl groups · CPC title

• G03G15/0818 Primary

  characterised by the structure of the donor member, e.g. surface properties · CPC title

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title