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US 2020/0399287 A1Published application
Visible light activated printing ink
AssigneeNano and Advanced Materials Institute Limited
InventorsPui Keong CHOW, Faan Fung HUNG, Chenmin LIU, Chi Ho KWOK
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Abstract
A visible light activated ink that produces a color change when exposed to visible light is provided. The ink includes a visible light activated photochromic compound, one or more binders, additives including one or more surfactants, and a solvent. The visible light activated ink is substantially colorless in the as-deposited state and requires a visible light intensity of approximately 300 W/m2 or greater at a wavelength of approximately 400-700 nm to produce a color change.
Claims17
A visible light activated ink comprising:
- a visible light activated photochromic compound in an amount of approximately 0.2 to 20 weight percent selected from one or more of π-extended conjugation heterocyclic compounds of naphthopyran, benzopyran, spirooxazine, spiropyran, fulgide, diarylethene, and/or perimidinespirocyclohexadienone;
- one or more binders in an amount of approximately 10 to 45 weight percent;
- additives in an amount from approximately 2 to 8 weight percent, the additives including one or more surfactants;
- and
- a solvent in an amount of approximately 35 to 70 weight percent;
- wherein the visible light activated ink requires a visible light intensity of approximately 300 W/m2 or greater at a wavelength of approximately 400-700 nm to produce a color change.
3 more elements
Dependencies are inferred from the claim text.