MARKING OF PLASTIC ITEMS BY OPTICAL DACTILAR PRINTING.

摘要

THE INVENTION REFERS TO A PLASTIC MATERIAL CONTAINING A PIGMENTARY COMPOSITION, WHICH INCLUDES A PIGMENT THAT IS ADSORBED IN ITS SURFACE, OR AS A PHYSICAL MIX, IN AN AMOUNT OF UP TO 10% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF THE COMPOSITION PIGMENTARY, OF A COFIFYING COMPOUND CONTAINING AN AZO GROUP, AZOMETINE OR A POLYCYCLE CHROME, AND THAT PRESENTS AN ABSORPTION SPECTRUM AND A RAMAN SPECTRUM, DIFFERENT FROM THOSE OF THE PIGMENT.