CODING COMPOSITION AND A METHOD OF RECOGNIZING COMPONENTS THEREOF Russian patent published in 2005 - IPC

FIELD: securities protection.

SUBSTANCE: invention relates to physicochemical protection of securities against falsifications. Coding composition contains one or several code-recognizing compounds, near IR region fluorescent agent, and IR-active compounds containing hydrogen-unbound or weakly bound X-H bonds (X = )-, N-, and ≡C-). Additionally included are IR-active compounds of general formula R₁-C≡C-R₂ (R₁ and R₂ are metal or halogen atoms). Method of invention resides in a single or multiple application(s) of one or several coding compositions onto object either avoiding spatial overlapping of compositions or in the form of compositions intersecting in different sequences of streaks, which sequences differ from each other in their code-recognizing components. Recognition of mutually masked code-recognizing and IR-active components is achieved either by way of varying wavelength in excitation spectra or varying intensity and shape of spectra in near IR fluorescence region. Sequence of applied streaks is determined from conformity of code-recognition spectra in higher monomolecular layer (or several monolayers) of composition in a streak intersection point to spectra of individual streaks.

EFFECT: increased information capacity of protection system due to increased diversity of differentiated components.

3 cl, 7 dwg, 6 ex