POLYMERIC MULTILAYER COMPOSITE FOR COUNTERFEIT-PROOF DOCUMENT AND/OR VALUABLE DOCUMENT Russian patent published in 2013 - IPC B41M3/14 B42D15/10 B32B27/18 

FIELD: printing.

SUBSTANCE: method of manufacturing a polymeric multilayer composite comprising several layers of polymer, at least one of which contains the laser-sensitive component, comprising the stages: A) at least on one of the polymeric layers by ink-jet method the first personalised information sign is applied as a coloured printed layer obtained by ink-jet method; B) the polymeric layer with the coloured printed layer obtained by ink-jet method, which is a polycarbonate layer, is then combined with other polymeric layers, at that the polymeric layer with the coloured printed layer obtained by ink-jet method is located between two other polymeric layers; C) in the polymeric multilayer composite obtained at the stage B) by means of laser engraving, the second personalised information sign is inserted. At that the printed layer obtained by ink-jet method comprises a binder which is the polycarbonate derivative which contains functional structural carbonate units of formula , where R¹ and R² independently of each other represent hydrogen, halogen, C₁-C₈-alkyl, C₅-C₆-cycloalkyl, C₆-C₁₀-aryl and C₇-C₁₂-aralkyl; m is an integer from 4 to 7; R³ and R⁴ are individually selected for each X and independently of each other from hydrogen or C₁-C₆-alkyl; X is carbon, and n is an integer greater than 20, providing that in at least one atom X, R³ and R⁴ simultaneously mean alkyl.

EFFECT: proposed invention provides protection against manipulation of colour personalised information signs

23 cl, 4 dwg