Photoresponsive material, adhesive, optical switching material, toner, and image forming method

Patent metadata

Field	Value
Publication number	US-11976230-B2
Application number	US-202117225724-A
Country	US
Kind code	B2
Filing date	Apr 8, 2021
Priority date	Apr 24, 2020
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

A composition includes an isomerized polymer containing a structural unit containing an isomerized structure and an isomerized low molecular weight compound, the composition being fluidized by light irradiation from a solid state and being reversibly non-fluidized.

First claim

What is claimed is:

1. A composition comprising an isomerizable polymer containing a structural unit containing an isomerizable structure and an isomerizable low molecular weight compound, the composition being fluidized by light irradiation from a solid state and being reversibly non-fluidized,
wherein the isomerizable polymer is a polymer containing a structural unit derived from an azomethine derivative, and the isomerizable low molecular weight compound is an azomethine compound.

2. The composition according to claim 1 , wherein
the azomethine derivative has a phenylene group having a linker moiety to a polymer main chain at a para position with respect to a carbon-nitrogen double bond, and
the azomethine compound has a phenyl group having an alkyl group having 1 to 18 carbon atoms or an alkoxy group having 1 to 18 carbon atoms at a para position with respect to a nitrogen-carbon double bond.

3. The composition according to claim 1 , wherein a mixing ratio between the isomerizable polymer and the isomerizable low molecular weight compound is within a range of isomerizable polymer: isomerizable low molecular weight compound=99:1 to 10:90 in terms of mass ratio.

4. The composition according to claim 1 , wherein the light has a wavelength of 280 nm or more and 480 nm or less.

5. A toner comprising the composition according to claim 1 .

6. The toner according to claim 5 , further comprising a binder resin.

7. The toner according to claim 6 , wherein the binder resin contains at least one selected from the group consisting of a styrene acrylic resin and a polyester resin.

8. A photoresponsive adhesive comprising the composition according to claim 1 .

9. An optical switching material comprising the composition according to claim 1 .

10. An image forming method comprising:
forming a toner image containing the toner according to claim 5 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 480 nm or less.

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

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

14. The image forming method according to claim 10 , wherein the toner image is heated under light irradiation in irradiating the toner image with light to soften the toner image.

Assignees

• Konica Minolta Inc

Inventors

• Nakai Yukiko
• Sugama Kouji
• Horiguchi Haruo
• Shibata Toyoko
• Hayata Hirofumi

Classifications

• C09K19/24 Primary

  linked by a chain containing nitrogen-to-nitrogen bonds · CPC title

• G02F1/0063

  Optical properties, e.g. absorption, reflection or birefringence (materials for non-linear optics G02F1/355) · CPC title

• G03C1/733

  with macromolecular compounds as photosensitive substances, e.g. photochromic (photodegradable or photocrosslinkable compositions G03F7/004) · CPC title

• C08K5/23

  Azo-compounds · CPC title

• G03G9/08 Primary

  with toner particles · CPC title