SECURED DOCUMENT AND METHOD OF ITS PRODUCTION Russian patent published in 2023 - IPC B42D25/40 B42D25/45 B42D25/36 B42D25/351 B42D25/355 

FIELD: technology of secured documents.

SUBSTANCE: invention is related to a secured document and to a method for producing a secured document. In this case, the secured document contains a substrate and a security feature, such as a diving security thread, a security foil, a security sticker, a hologram or a security feature printed with ink, and a protective coating. The security feature has a security feature thickness t_f of at least about 5 mcm (micrometres) and a security feature surface facing away from the substrate, consisting of a first region adjacent to the edges of the security feature and a second region not adjacent to the edges of the security feature. The security coating covers a surface of the security feature facing away from the substrate, a first surface of the substrate adjacent to the edges of the security feature, and a second surface of the substrate that is different from the surface of the substrate coated with the security feature and the first surface of the substrate. The security coating covering the surface of the security feature facing away from the substrate and the first surface of the substrate is transparent, the protective coating covering the first area has a thickness t_b1, the protective coating covering the second area has a thickness t_b2, the protective coating covering the first surface of the substrate has a thickness t_c, and the protective coating covering the second surface of the substrate has a thickness t_a. The thickness t_c is greater than the thickness t_f, which is greater than the thickness t_a; thickness t_b2 is greater than thickness t_a; and either the thickness t_c is greater than the thickness t_b1, which is greater than or equal to the thickness t_b2; or the thickness t_c is equal to the thickness t_b1, which is greater than the thickness t_b2.

EFFECT: variable thickness of the protective coating on the surface of the secured document provides an innovative secured document with increased resistance to physical and chemical environmental influences, while maintaining the mechanical resistance properties required for such secured documents.

17 cl, 7 dwg, 3 tbl