Thermal transfer sheet

Patent metadata

Field	Value
Publication number	US-12145389-B2
Application number	US-202017628363-A
Country	US
Kind code	B2
Filing date	Aug 24, 2020
Priority date	Aug 22, 2019
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

A thermal transfer sheet according to the present disclosure includes a substrate and a transfer layer disposed on the substrate. The transfer layer includes at least a peeling layer containing an allyl resin. This provides a thermal transfer sheet with high transferability and thin line printability.

First claim

The invention claimed is:

1. A thermal transfer sheet comprising a substrate and a transfer layer disposed on the substrate,
the transfer layer including at least a peeling layer, and a colored layer disposed on the peeling layer,
the peeling layer consisting essentially of an allyl resin and a polyester; and
the colored layer contains a colorant, an allyl resin and vinyl resin.

2. The thermal transfer sheet according to claim 1 ,
wherein the transfer layer further includes a protective layer disposed on the colored layer or between the peeling layer and the colored layer, and
the protective layer contains an allyl resin.

3. The thermal transfer sheet according to claim 1 , wherein the transfer layer includes an adhesive layer containing an allyl resin at an outermost surface thereof.

4. The thermal transfer sheet according to claim 3 , wherein the adhesive layer contains a colorant.

5. The thermal transfer sheet according to claim 1 , wherein the allyl resin contains diallyl phthalate as a polymerization component.

6. The thermal transfer sheet according to claim 1 , wherein the allyl resin is at least one resin selected from the group consisting of the following general formulas (1) to (4):

wherein, in formulas (1) to (4), m, n, and o represent an integer of 1 or more.

7. The thermal transfer sheet according to claim 1 , wherein the allyl resin has a weight average molecular weight (Mw) of 5,000 or more and 100,000 or less.

8. The thermal transfer sheet according to claim 1 , wherein a ratio of a content of the polyester to a content of the allyl resin in the peeling layer (content of polyester/content of allyl resin) is 10/90 or more and 85/15 or less by mass.

9. The thermal transfer sheet according to claim 3 , wherein the adhesive layer further contains a vinyl resin.

10. The thermal transfer sheet according to claim 9 , wherein a ratio of a content of the vinyl resin to a content of the allyl resin in the adhesive layer (content of vinyl resin/content of allyl resin) is 10/90 or more and 60/40 or less by mass.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Oota Mitsuhiro

Classifications

• B41M5/42 Primary

  Intermediate, {backcoat}, or covering layers {(B41M5/405 takes precedence; multilayer thermal transfer systems in general B41M5/38214)} · CPC title

• B41M2205/38

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

• B41M2205/30

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

• B41M2205/06

  relating to melt (thermal) mass transfer · CPC title

• B41M2205/40

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