Laminate, heat-sensitive recording body, and method for forming image

Patent metadata

Field	Value
Publication number	US-2023399527-A1
Application number	US-202118034885-A
Country	US
Kind code	A1
Filing date	Nov 9, 2021
Priority date	Nov 17, 2020
Publication date	Dec 14, 2023
Grant date	—

Abstract

A laminate according to the present invention comprises, in the following order: a substrate ( 3 ); a primer layer ( 2 ) formed from a resin; and a colloidal crystal layer ( 1 ) that develops color due to light interference, wherein the resin, which forms the primer layer ( 2 ), has a glass transition point in the range of −35 to 100° C., the colloidal crystal layer ( 1 ) includes core-shell-type resin fine particles ( 4 ) and achromatic black fine particles ( 8 ), and has voids ( 7 ). The core-shell-type resin fine particles ( 4 ) each include a shell in an amount of 10-150 mass % with respect to the mass of a core, and the shell has a glass transition point in the range of −60 to 40° C. The colloidal crystal layer ( 1 ) has a thickness in the range of 0.5-100 μm.

First claim

1 . A laminate in which a substrate, a primer layer formed from a resin, and a colloidal crystal layer that develops color due to light interference are arranged in this order,
wherein the resin forming the primer layer has a glass transition point in a range of −35 to 100° C., the colloidal crystal layer contains core-shell-type resin fine particles and achromatic black fine particles, and has voids, the core-shell-type resin fine particles contain a shell in a range of 10 to 150 mass % based on a mass of a core, and the shell has a glass transition point in a range of −60 to 40° C., and
the colloidal crystal layer has a thickness in a range of 0.5 to 100 μm.

2 . The laminate according to claim 1 ,
wherein the core has a glass transition point of 50° C. or higher.

3 . The laminate according to claim 1 ,
wherein the colloidal crystal layer contains the achromatic black fine particles in a range of 0.3 to 3 mass % based on the mass of the core-shell-type resin fine particles.

4 . The laminate according to claim 1 ,
wherein the resin forming the primer layer has an acid value in a range of 5 to 140 mg KOH/g.

5 . The laminate according to claim 1 , where
in the core of the core-shell-type resin fine particles contains a structural unit derived from an aromatic ethylenically unsaturated monomer in a range of 70 to 100 mass % based on the mass of the core.

6 . The laminate according to claim 1 ,
wherein the shell of the core-shell-type resin fine particles contains, based on the mass of the shell, a structural unit derived from an ethylenically unsaturated monomer (s-1) having an octanol/water partition coefficient in a range of 1 to 2.5 in a range of 70 to 99.5 mass % and a structural unit derived from an ethylenically unsaturated monomer (s-2) having an octanol/water partition coefficient of less than 1 in a range of 0.5 to 15 mass %.

7 . The laminate according to claim 1 ,
wherein the core-shell-type resin fine particles contain a structural unit derived from a reactive surfactant.

8 . The laminate according to claim 1 , which has a resin layer on the colloidal crystal layer.

9 . A heat-sensitive recording material formed using the laminate according to claim 1 .

10 . The heat-sensitive recording material according to claim 9 , further comprising an adhesive layer.

11 . A method for forming an image, comprising
heating the heat-sensitive recording material according to claim 9 to fade color development of a colloidal crystal layer.

Assignees

• Toyo Ink Sc Holdings Co Ltd

Inventors

• Koike Takaaki
• Kishimoto Naoki
• MAMIYA Michitaka

Classifications

• B41M2205/38

  Intermediate layers; Layers between substrate and imaging layer · CPC title

• B41M2205/04

  Direct thermal recording [DTR] · CPC title

• B41M5/44 Primary

  characterised by the macromolecular compounds · CPC title

• B41M5/366 Primary

  using materials comprising a polymeric matrix containing a polymeric particulate material, e.g. hydrophobic heat coalescing particles · CPC title

• C09D5/26 Primary

  Thermosensitive paints · CPC title