PROTECTIVE LAYER MATERIAL Russian patent published in 2011 - IPC B42D15/10 B32B7/00 

FIELD: printing industry.

SUBSTANCE: invention relates to the field of protective layer materials, which withstand unauthorised unsealing or indicate signs of unauthorised opening. Layer material for identification document, which withstands unauthorised opening, comprises a bearing film, which has the first adhesive layer on surface, containing one or more visible check values. Coating film, having the first surface detachably fixed to the first adhesive layer and the second surface having printed protective feature and the second adhesive layer. At the same time the coating film thickness does not exceed 12 micron.

EFFECT: invention provides a high extent of counterfeit protection, as well as protection against unauthorised and unrecognised unsealing of material.

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