Thermal transfer sheet

Patent metadata

Field	Value
Publication number	US-10029503-B2
Application number	US-201715454508-A
Country	US
Kind code	B2
Filing date	Mar 9, 2017
Priority date	Sep 26, 2013
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

Disclosed is a thermal transfer sheet which is provided with a substrate, at least a transferable protective layer and a transferable color layer in this order on one side of the substrate, and is provided with a back face layer on the other side of the substrate, characterized in that the transferable protective layer contains a cyclic olefin-based polymer having a glass transition temperature of 100° C. or more as a main component and further contains an incompatible resin with the cyclic olefin-based polymer, and the transferable color layer contains a colorant and a phenolic resin having a softening point of 100° C. or more.

First claim

The invention claimed is:

1. A thermal transfer sheet comprising:
a substrate;
a transferable color layer disposed on one side of the substrate; and
a back face layer disposed on the other side of the substrate,
wherein the transferable color layer contains a colorant and a binder resin containing a reaction product between a phenolic resin having a softening point of 100° C. or more and an adduct product of an aliphatic polyisocyanate.

2. The thermal transfer sheet according to claim 1 , wherein an equivalent ratio of isocyanate groups of the adduct product of an aliphatic polyisocyanate to hydroxyl groups of the phenolic resin having a softening point of 100° C. or more, (NCO/OH), is 0.05 to 0.5.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Ishida Tadahiro
• Takao Masato

Classifications

• B41M5/426

  characterised by inorganic compounds, e.g. metals, metal salts, metal complexes · CPC title

• B41M2205/40

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

• B41M5/44

  characterised by the macromolecular compounds · CPC title

• B41M5/38214

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

• B41M2205/38

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