Reversible thermochromic systems
OwnerNathalie Lerouxinventor
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Abstract
The present invention provides a reversible thermochromic system that is a two-component system based on an electron donating compound (color former) and an electron accepting compound (developer). A temperature increase to the melting point of the developer causes the system to change from a colorless state to a colored state and a temperature drop below the recrystallization temperature of the developer causes the system to change from the colored state to the colorless state. The thermochromic system of the present invention is applicable to various types of inks, such as a flexographic printing ink, a screen printing ink, a lithographic printing ink, and an intaglio printing ink. The invention also provides a method for preparing the thermochromic system of the present invention.
Claims20
A reversible thermochromic system comprising an electron donating compound and an electron accepting compound, wherein the combination of the electron donating compound and the electron accepting compound is reversibly thermochromic and a color change is detectable by the human eye, clolorimetric measurement, or both.
A method for preparing a reversible thermochromic system comprising combining an electron donating compound and an electron accepting compound, wherein the combination of the electron donating compound and the electron accepting compound is reversibly thermochromic.
Dependencies are inferred from the claim text.