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US 2024/0174878 A1Published application
Thermochromic Liquid Crystal Inks
AssigneeSun Chemical Corporation
InventorsRoger Jacot, Kurt Klaus, Stefan Küffer
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Abstract
The present invention provides thermochromic liquid crystal inks and coatings. The ink and coating compositions comprise one or more non-encapsulated cholesteryl materials, one or more resins that are not cholesteryl materials, and one or more solvents. In certain embodiments, a thermochromic effect is observed at about body temperature.
Claims20
A method of providing a reversible thermochromic printed or coated substrate, comprising:
- (a) providing a substrate;
- (b) applying one or more layers of an ink or coating composition to the substrate, wherein the ink comprises;
- i. one or more cholesteryl materials that are non-encapsulated;
- wherein each cholesteryl material has an anisotropic phase to mesophase threshold transition temperature TLC1, and a mesophase to isotropic phase threshold transition temperature TLC2;
- ii. one or more organic solvents;
- iii. one or more resins that are not cholesteryl materials;
- and
- (c) drying the composition on the substrate to form a reversible thermochromic ink film.
5 more elements
Dependencies are inferred from the claim text.