THERMO-SENSITIVE TAGS FOR DETECTING ADULTERATION Russian patent published in 2018 - IPC C09D11/37 C09D11/50 B41M3/14 

FIELD: chemistry.

SUBSTANCE: composition of the paint includes particles of optically variable pigment and thermally expandable spheres containing propellant. The pigment can be a thin-film interference, interference coated, cholesteric liquid crystal, or a mixture thereof. To produce tags for detecting adulteration, an optically variable paint is applied on a substrate by printing. The application can be carried out by screen printing, flexographic or rotational gravure. Adulteration of the tag on the substrate is detected by the irreversible colour change and/or the tag structure when exposed to a temperature of at least 35°C. The product on which the optically variable paint is applied represent valuable documents: a stamp on the tax payment, an excise stamp; or valuable products: cosmetic, nutraceutical, pharmaceutical, alcoholic beverages, beverages or food, electrical/electronic products, fabrics, and jewellery.

EFFECT: ability to prove the adulteration by applying optically variable paint.

22 cl, 1 dwg, 2 tbl, 2 ex