Recording medium and laminate

Patent metadata

Field	Value
Publication number	US-2025042191-A1
Application number	US-202218718729-A
Country	US
Kind code	A1
Filing date	Dec 21, 2022
Priority date	Dec 22, 2021
Publication date	Feb 6, 2025
Grant date	—

Abstract

A recording medium capable of reducing a color gamut change is provided. The recording medium includes a plurality of coloring layers and at least one diffusion reduction layer. Each of the coloring layers includes a coloring compound that is electron-donative, a developer that is electron-acceptive, and matrix resin. The diffusion reduction layer is provided between the coloring layers adjacent to each other. The diffusion reduction layer is capable of reducing diffusion of the coloring compound between the coloring layers adjacent to each other during heating of the recording medium.

First claim

What is claimed is:

1 . A recording medium, comprising:
a plurality of coloring layers; and at least one diffusion reduction layer, wherein each of the coloring layers includes a coloring compound that is electron-donative, a developer that is electron-acceptive, and matrix resin, the diffusion reduction layer is provided between the coloring layers adjacent to each other, and the diffusion reduction layer is capable of reducing diffusion of the coloring compound between the coloring layers adjacent to each other during heating of the recording medium.

2 . The recording medium according to claim 1 , further comprising:
at least one binder layer, wherein the binder layer is provided between the diffusion reduction layer and the coloring layers.

3 . The recording medium according to claim 1 , wherein average peel strength between the respective layers of the recording medium is 3.5 N/cm or higher.

4 . The recording medium according to claim 1 , wherein average peel strength between the coloring layers adjacent to each other is lower than 3.5 N/cm.

5 . The recording medium according to claim 1 , wherein the matrix resin contains polycarbonate resin.

6 . The recording medium according to claim 1 , wherein a temperature of the heating ranges from 120° C. to 200° C.

7 . The recording medium according to claim 1 , wherein a temperature of the heating ranges from 160° C. to 200° C.

8 . The recording medium according to claim 1 , wherein the diffusion reduction layer is a resin layer that has no tackiness in an atmosphere of a standard state at a temperature of 23° C.±1° C. and relative humidity of 50%±5%.

9 . The recording medium according to claim 1 , wherein the diffusion reduction layer has a Young's modulus of 100 MPa or higher.

10 . The recording medium according to claim 1 , wherein the diffusion reduction layer has a Young's modulus of 2000 MPa or higher.

11 . The recording medium according to claim 1 , wherein the diffusion reduction layer is a resin layer that has pencil hardness of F or higher.

12 . The recording medium according to claim 1 , wherein the diffusion reduction layer has a glass transition temperature of 130° C. or higher.

13 . The recording medium according to claim 1 , wherein the diffusion reduction layer contains amorphous resin.

14 . The recording medium according to claim 1 , wherein the diffusion reduction layer contains crystalline resin.

15 . The recording medium according to claim 1 , wherein the diffusion reduction layer contains UV-curable resin.

16 . A laminate, comprising:
the recording medium according to claim 1 ; a base material; and an overlay layer, wherein the recording medium is provided between the base material and the overlay layer.

17 . The laminate according to claim 16 , wherein the base material and the recording medium are bonded to each other by fusion or a thermal adhesive, and the recording medium and the overlay layer are bonded to each other by fusion or a thermal adhesive.

Assignees

• Sony Group Corp

Inventors

• Takagi Kenji
• Mizuno Hiroshi
• Yamano Ryota
• Tejima Aya

Classifications

• B32B2554/00

  Paper of special types, e.g. banknotes · CPC title

• B32B2255/26

  Polymeric coating · CPC title

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title

• B32B2307/54

  Yield strength; Tensile strength · CPC title

• B32B27/365

  comprising polycarbonates · CPC title