Thermal donor laminate formulation and thermal donor elements comprising the same

Patent metadata

Field	Value
Publication number	US-12275262-B2
Application number	US-202017090541-A
Country	US
Kind code	B2
Filing date	Nov 5, 2020
Priority date	Nov 8, 2019
Publication date	Apr 15, 2025
Grant date	Apr 15, 2025

Abstract

Described herein are embodiments of thermal donor laminate formulations and thermal transfer donor elements comprising the same. Thermal donor elements described herein can be used to transfer the laminate onto thermal receiver elements using thermal transfer means to create a transparent, protective overcoat film. In certain embodiments, the laminate is formulated without colloidal silica. Laminate formulations comprise appropriate solvent packages to account for the removal of colloidal silica, including, in some embodiments, solvent packages that do not include DEK. Certain embodiments described herein exhibit advantageous performance characteristics, such as avoiding and/or mitigating flash, satin back transfer, and print artifacts, and resist scratches.

First claim

The invention claimed is:

1. A thermal donor laminate formulation comprising:
a polymeric binder resin comprising a polyvinyl acetal resin with a glass transition temperature (Tg) between about 70 to 120 degrees Celsius;
a polymethyl methacrylate resin with a molecular weight ranging from 15,000 up to and including 100,000;
an organic solvent; and
a cellulose ester resin.

2. The thermal donor laminate formulation of claim 1 , wherein the cellulose ester resin comprises cellulose acetate propionate.

3. The thermal donor laminate formulation of claim 1 , wherein the organic solvent is not diethyl ketone.

4. The thermal donor laminate formulation of claim 1 , wherein the formulation does not include colloidal silica.

5. The thermal donor laminate formulation of claim 1 , wherein the solvent comprises one or more of n-hexane, methanol, methyl n-butyl ketone, methyl ethyl ketone, toluene, or hexanedione.

6. The thermal donor laminate formulation of claim 1 , wherein a dry weight ratio of the polyvinyl acetal resin to the cellulose ester resin is from about 5:1 to about 12:1.

7. The thermal donor laminate formulation of claim 1 , further comprising:
one or more release agents.

8. The thermal donor laminate formulation of claim 1 , further comprising:
UV absorbing light stabilizer materials.

Assignees

• Kodak Alaris Inc
• Kodak Alaris Llc

Inventors

• Foster David
• Schild Michael
• Wagner Robert
• Brongo Cheryl
• Emmons Jared

Classifications

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L33/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• B41M7/0027

  using protective coatings or layers by lamination or by fusion of the coatings or layers · CPC title

• B41M5/395 Primary

  Macromolecular additives, e.g. binders · CPC title

• B41M5/38264 Primary

  Overprinting of thermal transfer images · CPC title