Thermal transfer sheets

Patent metadata

Field	Value
Publication number	US-9956803-B2
Application number	US-201615393308-A
Country	US
Kind code	B2
Filing date	Dec 29, 2016
Priority date	Jan 6, 2016
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

The thermal transfer sheet according to the present invention that has, in the order mentioned, a substrate, a colored layer, and an adhesion layer; and wherein the colored layer contains a colorant, polyester-based resin A, and polyester-based resin B; the number average molecular weight of the polyester-based resin A is not less than 15,000; the number average molecular weight of the polyester-based resin B is not more than 5,000; a content ratio by mass of the polyester-based resin A to the polyester-based resin B (polyester-based resin A/polyester-based resin B) in the colored layer is not less than 2/3 and not more than 9/1; and the adhesion layer includes a polyester-based resin.

First claim

What is claimed is:

1. A thermal transfer sheet comprising, in the order mentioned, a substrate, a colored layer, and an adhesion layer, wherein
said colored layer comprises a colorant, polyester-based resin A, and polyester-based resin B;
the number average molecular weight of said polyester-based resin A is not less than 15,000;
the number average molecular weight of said polyester-based resin B is not more than 5,000;
a content ratio by mass of said polyester-based resin A to said polyester-based resin B (polyester-based resin A/polyester-based resin B) in said colored layer is not less than 2/3 and not more than 9/1; and
said adhesion layer comprises a polyester-based resin.

2. The thermal transfer sheet according to claim 1 wherein said content ratio by mass of said polyester-based resin A to said polyester-based resin B (polyester-based resin A/polyester-based resin B) in said colored layer is not less than 1/1 and not more than 4/1.

3. The thermal transfer sheet according to claim 2 , wherein the thickness of said colored layer is not less than 0.2 μm and not more than 0.8 μm.

4. The thermal transfer sheet according to claim 3 , wherein the number average molecular weight of said polyester-based resin contained in said adhesion layer is not less than 2,000 and not more than 25,000.

5. The thermal transfer sheet according to claim 4 that further comprises a release layer between said substrate and said colored layer.

6. The thermal transfer sheet according to claim 3 that further comprises a release layer between said substrate and said colored layer.

7. The thermal transfer sheet according to claim 2 , wherein the number average molecular weight of said polyester-based resin contained in said adhesion layer is not less than 2,000 and not more than 25,000.

8. The thermal transfer sheet according to claim 7 that further comprises a release layer between said substrate and said colored layer.

9. The thermal transfer sheet according to claim 2 that further comprises a release layer between said substrate and said colored layer.

10. The thermal transfer sheet according to claim 1 , wherein the thickness of said colored layer is not less than 0.2 μm and not more than 0.8 μm.

11. The thermal transfer sheet according to claim 10 , wherein the number average molecular weight of said polyester-based resin contained in said adhesion layer is not less than 2,000 and not more than 25,000.

12. The thermal transfer sheet according to claim 11 that further comprises a release layer between said substrate and said colored layer.

13. The thermal transfer sheet according to claim 10 that further comprises a release layer between said substrate and said colored layer.

14. The thermal transfer sheet according to claim 1 , wherein the number average molecular weight of said polyester-based resin contained in said adhesion layer is not less than 2,000 and not more than 25,000.

15. The thermal transfer sheet according to claim 14 that further comprises a release layer between said substrate and said colored layer.

16. The thermal transfer sheet according to claim 1 , that further comprises a release layer between said substrate and said colored layer.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Imakura Yuzu

Classifications

• B41M5/395 Primary

  Macromolecular additives, e.g. binders · CPC title

• B41M2205/40

  Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging · CPC title

• B41M5/44 Primary

  characterised by the macromolecular compounds · CPC title

• B41M2205/30

  Thermal donors, e.g. thermal ribbons · CPC title

• B41M5/38214

  Structural details, e.g. multilayer systems (composition of individual layers B41M5/42) · CPC title