Thermal donor laminate formulation and thermal donor elements comprising the same
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.
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.