HIDDEN MARKING METHOD Russian patent published in 2023 - IPC C09K11/06 C08K5/55 

FIELD: luminescent compositions.

SUBSTANCE: luminescent compositions based on β-diketonates of boron difluoride, suitable for hidden marking of material objects. The method of hidden marking is proposed, which consists in the formation of a film containing polycarbonate and 0.05-1 wt.% of diarylmethanate or arylacetonate of boron difluoride by the solution method, followed by applying a protective image by irradiating the film with a source of high-intensity UV radiation in the range of 360-410 nm and subsequent verification of the image.

EFFECT: proposed method for marking polymer films, in which marking and activation of a luminescent dye does not require the use of technically complex equipment, and identification of protective marking is possible using a compact ultraviolet flashlight or UV lamp.

1 cl, 1 dwg, 1 tbl, 11 ex