Toner and image forming method

Patent metadata

Field	Value
Publication number	US-10712682-B2
Application number	US-201916506010-A
Country	US
Kind code	B2
Filing date	Jul 9, 2019
Priority date	Aug 28, 2018
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

A toner includes toner particles, wherein the toner particles contain a polymer containing a structural unit derived from an azobenzene derivative having a polymerizable group.

First claim

What is claimed is:

1. A toner comprising toner particles, wherein
the toner particles contain a polymer containing a structural unit formed from a monomer having an azobenzene group and a polymerizable group, and
the polymerizable group comprises a (meth)acryloyl group, an epoxy group, or a vinyl group.

2. The toner according to claim 1 , wherein
the monomer has the polymerizable group as only one polymerizable group in one molecule.

3. The toner according to claim 1 , wherein
the monomer has a group represented by any one of the following formulas (i) to (iii) as the polymerizable group:

where
R 1 represents a hydrogen atom or a methyl group, and
R 2 represents an alkylene group having 1 to 12 carbon atoms.

4. The toner according to claim 1 , wherein
the monomer is represented by the following formula (1):

where
any one of X 1 to X 3 represents the polymerizable group, and the remaining groups each represent a hydrogen atom, and
R 3 to R 5 each represent a hydrogen atom, a functional group containing a hetero atom, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms.

5. The toner according to claim 4 , wherein
the monomer is represented by the following formula (2):

where
X 1 represents the polymerizable group, and
R 3 represents a hydrogen atom, a functional group containing a hetero atom, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms.

6. The toner according to claim 5 , wherein
the monomer is represented by the following formula (3):

where
R 1 represents a hydrogen atom or a methyl group,
R 2 represents an alkylene group having 1 to 12 carbon atoms, and
R 3 represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

7. The toner according to claim 1 , wherein
the polymer further contains a structural unit formed from a monomer having a styrene structure.

8. The toner according to claim 1 , further comprising a binder resin.

9. The toner according to claim 1 , optionally further comprising a binder resin, wherein
a content ratio between the polymer and the binder resin is polymer:binder resin=60:40 to 100:0 (mass ratio).

10. An image forming method comprising:
forming a toner image containing the toner according to claim 1 on a recording medium; and
irradiating the toner image with light to soften the toner image.

11. The image forming method according to claim 10 , wherein
the light has a wavelength of 280 nm or more and less than 480 nm.

12. The image forming method according to claim 10 , further comprising pressurizing the softened toner image.

13. The image forming method according to claim 12 , wherein
the toner image is further heated in the pressurizing.

14. A toner comprising toner particles, wherein
the toner particles contain a polymer containing a structural unit having an azobenzene group and having a number average molecular weight Mn of 3500 or more.

15. The toner according to claim 14 , further comprising a binder resin.

16. The toner according to claim 14 , optionally further comprising a binder resin, wherein
a content ratio between the polymer and the binder resin is polymer: binder resin=60:40 to 100:0 (mass ratio).

17. An image forming method comprising:
forming a toner image containing the toner according to claim 14 on a recording medium; and
irradiating the toner image with light to soften the toner image.

Assignees

• Konica Minolta Inc

Inventors

• Takahashi Seijiro
• Horiguchi Haruo
• Shibata Toyoko

Classifications

• G03G9/08791

  characterised by the presence of specified groups or side chains · CPC title

• G03G9/09775 Primary

  containing atoms other than carbon, hydrogen or oxygen (G03G9/09741 - G03G9/09766 take precedence) · CPC title

• G03G9/08711

  with esters of acrylic or methacrylic acid · CPC title

• G03G15/2021 Primary

  Plurality of separate fixing and/or cooling areas or units, two step fixing · CPC title

• G03G15/04036

  Details of illuminating systems, e.g. lamps, reflectors (lamp housings for copying cameras, reflex exposure lighting G03B27/542) · CPC title